Answers
Answer:
Deductive reasoning (Brainliest please)
Explanation:Deductive reasoning begins with a general principle and a prediction based on this principle; the prediction is then tested, and a specific conclusion can then be drawn. The first step in the process of inductive reasoning is making specific observations.
Related Questions
Which of the following happens during a chemical change? Check all of the boxes that apply.
One atom or more changes into atoms of another element.
New substances with different properties are formed.
Solids, liquids, or gases may form.
Reaction mixtures always give off some heat.
Reaction mixtures always need to be heated.
00
Answers
The correct options that apply during a chemical change are:
A) One atom or more changes into atoms of another element.
B) New substances with different properties are formed.
C) Solids, liquids, or gases may form. Option A, B and C
During a chemical change, the arrangement of atoms in molecules is altered, resulting in the formation of new substances with different chemical properties. This is represented by option B. For example, when hydrogen gas (H₂) reacts with oxygen gas (O₂), a chemical change occurs, and water (H₂O) is formed. The properties of water, such as boiling point, density, and chemical reactivity, are distinct from those of its constituent elements.
Additionally, during a chemical change, atoms can rearrange to form molecules of different elements, as indicated in option A. For instance, during a nuclear reaction, such as radioactive decay, the nucleus of an atom can change, leading to the formation of atoms of different elements.
Option C is also correct. Depending on the specific reaction conditions, chemical changes can result in the formation of solids, liquids, or gases. For example, when a metal reacts with an acid, such as zinc with hydrochloric acid, a gas (hydrogen) is produced.
Options D and E are not universally applicable to all chemical changes. While some reactions may release heat energy (exothermic reactions), others may absorb heat energy (endothermic reactions). The requirement for heating or the release of heat depends on the specific reaction and its energy considerations.
In summary, during a chemical change, atoms can change into atoms of another element (A), new substances with different properties are formed (B), and solids, liquids, or gases may form (C).
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which of the following solutions contains the greatest number of ions, assuming all these salts dissociate completely? A)400.0 ml of 0.10 m nacl. b) 300.0 ml of 0.10 m cacl2. C) 200.0 ml of 0.10 m fecl3. D) 800.0 ml of 0.10 m sucrose.
Answers
300.0 ml of 0.10 m CaCl₂ of the following solutions contains the greatest number of ions, assuming all these salts dissociate completely.
What are ions simple definition?An is an atom or collection of atoms where the number of electrons and the number of protons are different. A positive ion, also known as a cation, is a particle that exists when the flow of atoms exceeds the number of protons. Ions are electrically charged particles that are created either by taking electrons out of neutral atoms to make positive ions or adding protons to neutral atoms to produce negative ions. The quantity of protons remains constant during the formation of an ion.
Briefing:The number of moles in 300. mL of 0.10 M CaCl₂ is:
0.300 L * 0.10 Mol L = 0.030 mol
Each mole of CaCl₂ contains 3 moles of ions (1 Ca²⁺ and 2 Cl⁻). The moles of ions in 0.030 moles of CaCl₂ are:
0.30molNaCl * 3mol Ions / 1 mol NaCl = 0.90 mols
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which is the graph of the function g(x) = f(-x)
Answers
To graph the function g(x) = f(-x), you can start with the graph of f(x) and then reflect it about the y-axis.
What is a graph of the function g(x) = f(-x)?To find the graph of the function g(x) = f(-x), we can start with the graph of the function f(x) and then reflect it about the y-axis.
If the graph of f(x) is symmetric with respect to the y-axis, meaning it is unchanged when reflected, then g(x) = f(-x) will have the same graph as f(x).
However, if the graph of f(x) is not symmetric with respect to the y-axis, then g(x) = f(-x) will be a reflection of f(x) about the y-axis.
In either case, the resulting graph of g(x) = f(-x) will be symmetric with respect to the y-axis.
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2 NH3 + 3 CuO g 3 Cu + N₂ + 3H₂O
In the above equation how many moles of N₂ can be made when 38 moles of CuO are
consumed?
Answers
The moles of N2 formed when 38 moles of CuO is consumed 12.66 mol.
What is moles?
A mole of a substance can be defined as an amount of substance having 6.022 x 10^23 particles in it. This number is known as Avogadro's number. All the balanced chemical equations are written using number of moles of reactants and products.
The balanced chemical equation of the reaction can be written as,
2 NH3 + 3 CuO ------> 3 Cu + N2 + 3 H2O
Here, 2 moles of ammonia is reacting with 3 moles of CuO to give 3 moles of Cu, 1 mole of N2 and 3 moles of water. So when 38 moles of CuO is consumed,
Moles of N2 = 38 x 1 / 3 = 12.66 mol.
Therefore, 12.66 mole of N2 is formed when 38 moles of CuO is consumed in the reaction.
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 Please help me with this Chemistry problem! I’ve been trying to figure it out for hours and it’s driving me mad. I’ll be very grateful :) I made it worth 100 points!
Answers
Explanation:
Hope this somewhat helped:
a. The equation for the reaction of weak acid, C6H5CO2H, with water is: C6H5CO2H + H2O <=> C6H5CO2^- + H3O^+. We can assume that all the C6H5CO2H has reacted with water to form C6H5CO2^- and H3O^+.
The pH is defined as -log(H30^+ concentration), where H30^+ is the hydronium ion, a measure of the acidic strength of the solution. At the equivalence point, all the C6H5CO2H has reacted with the NaOH to form C6H5CO2^- and Na^+. The stoichiometry of the reaction can be determined by balanced the reaction using the information given.
C6H5CO2H + NaOH <=> C6H5CO2^- + Na^+
This reaction tells us that one mole of C6H5CO2H will react with one mole of NaOH to form one mole of C6H5CO2^- and one mole of Na^+.
A chemist titrates 150.0 mL of a 0.8748M benzoic acid (HC,H,CO₂) solution with 0.3544M KOH solution at 25 °C. Calculate the pH at equivalence. The pK,
of benzoic acid is 4.20.
Round your answer to 2 decimal places.
Answers
HC7H5O2(aq) + KOH(aq) → KC7H5O2(aq) + H2O(l)
The number of moles of benzoic acid used in the titration is:
n(HC7H5O2) = M × V = 0.8748 mol/L × 150.0 mL / 1000 mL/L = 0.13122 mol
The volume of KOH solution required to reach equivalence point can be determined using the stoichiometry of the balanced equation. The stoichiometric ratio of benzoic acid to potassium hydroxide is 1:1. Therefore, the number of moles of KOH required to neutralize all of the benzoic acid is equal to n(HC7H5O2):
n(KOH) = 0.13122 mol
The volume of KOH solution required can be calculated as:
V(KOH) = n(KOH) / M(KOH) = 0.13122 mol / 0.3544 mol/L = 0.3701 L
At equivalence, the total volume of the solution is:
V(total) = V(HC7H5O2) + V(KOH) = 0.1500 L + 0.3701 L = 0.5201 L
The concentration of the salt formed, KC7H5O2, is:
M(KC7H5O2) = n(KC7H5O2) / V(total) = n(HC7H5O2) / V(total) = 0.13122 mol / 0.5201 L = 0.2523 M
The pH at equivalence can now be calculated using the acid dissociation constant (Ka) of benzoic acid:
Ka = [H+][C7H5O2-] / [HC7H5O2]
pKa = -log(Ka) = -log(6.3 × 10^-5) = 4.20
At equivalence, the concentration of benzoic acid and benzoate ions are equal, so [HC7H5O2] = [C7H5O2-]. Let x be the concentration of H+ ions at equivalence. Then:
Ka = x^2 / (0.2523 - x)
Solving this equation for x gives:
x = sqrt(Ka × (0.2523 - x)) = sqrt(6.3 × 10^-5 × 0.2523) = 0.002532
Therefore, the pH at equivalence is:
pH = -log[H+] = -log(0.002532) = 2.60
Rounding to two decimal places, the pH at equivalence is 2.60.
I understand how a change in the size of the moon jellies' resource population can change the number of births in the moon jelly population.
Responses
Explain your answer choice.
Answers
A change in the size of the moon jellies' resource population can change the number of births in the moon jelly population because the big size of the resources can produce more births.
How do moon jellies reproduce?When there is more energy storage molecules present in the moon jellies, they can reproduce more, in more births. Fewer deaths would also lead to the jelly population increasing. The sea turtle population, and the moon jellies consumer population is also decreased.
There must be a change to the birth rate or the death rate in the moon jelly population. Within a population, organisms are born and dying continuously. If the number of births and deaths in a given time interval are equal, then the population size will remain stable.
So we can conclude that a large population of resources will lead to more births.
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if 9.00g grams of gas are enclosed in a 50.00 L vessel at 273.15K and 2.000 atmospheres of pressure , what is the molar mass of the gas? what gas is this?
Answers
Answer: 4.88 g/mol. and helium
Explanation:
To find the molar mass of the gas, we can use the ideal gas law equation which is PV=nRT where:
P = pressure = 2.000 atm
V = volume = 50.00 L
n = number of moles
R = gas constant = 0.08206 L·atm/K·mol
T = temperature = 273.15 K
First, we need to find the number of moles of the gas:
PV = nRT
n = PV/RT
n = (2.000 atm)(50.00 L)/(0.08206 L·atm/K·mol)(273.15 K)
n = 1.844 mol
Now, we can find the molar mass of the gas by dividing its mass by the number of moles:
molar mass = mass/number of moles
mass = 9.00 g
molar mass = 9.00 g/1.844 mol
molar mass = 4.88 g/mol
Therefore, the molar mass of the gas is 4.88 g/mol.
To determine what gas this is, we can compare the molar mass of the gas to the molar masses of known gases. The molar mass of 4.88 g/mol is closest to that of helium (4.00 g/mol). Therefore, this gas is most likely helium.
Drag the tiles to the correct locations on the equation. Not all tiles will be used.
Two atoms interact with each other and change as shown by the equation. Complete the equation by filling in the missing parts.
5
2
4
3
1
H+H -
H
He
Li
+
Answers
The equation in the question is: H+H → H + H Complete the equation by filling in the missing parts. missing part is 1 → H+H-2 → →3 → He.
The atomic number of hydrogen is 1, which means it has only one proton in the nucleus and one electron in its shell. Two hydrogen atoms react with each other to form helium. Helium has 2 protons and 2 neutrons in its nucleus and two electrons in its shell. Therefore, the equation is:
H + H → HeIt can be seen that:1. H + H (Reactants)
2. → (Yields or Reacts to form)
3. He (Product)Therefore, the tiles will be arranged as shown below: 1 → H+H-2 → →3 → He
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Read the passage and answer the question.
In 2000, when paleontologist Paul Sereno led an expedition into Ténéré desert in Niger looking for the fossils of dinosaurs and ancient crocodiles, the photographer Mike Hettwer wandered away from the group to take pictures of some dunes near the main dig site. The photographer quickly found bones sticking out of the dunes, but they were human bones, not the prehistoric reptile bones the group had been looking for. However, the group was not going to pass up such an amazing discovery.
During the site excavation, the paleontologists found dozens of gravesites. Some of them held skeletal remains and potsherds with wavy lines etched in them. The scientists named this group the Kiffians. The others held skeletal remains that indicated a taller group of people, and their potsherds were decorated with patterns of dots. The scientists named this group the Tenerians. The graves also contained tools and beads made from stones or bones, as well as refuse heaps containing the bones of the animals the people living in the area had consumed. Some of the graves didn't contain any pottery so it was a mystery which group they belonged to. It was also not known when these people lived in the desert or how they survived.
The carbon-14 dating revealed that the Kiffians lived in the area around 9,700 years ago, and then the area was abandoned until the Tenerians lived in the area 7,000 years ago. The scientists want to reconstruct what the land looked like when it was inhabited, as well as understand why there was about a 2,000-year-gap during which nobody lived in the area.
The scientists hypothesize that the two civilizations lived around a lake that dried up during periods of drought and then eventually reformed. The changing lake led people to move, depending on if they had a water source or not.
How can scientists use radiometric dating to reconstruct the geologic history of the area to support or reject their hypothesis of a disappearing and reappearing lake? What is a tool that scientists can use to ensure that their radiometric dating is accurate?
Answers
Answer & Explanation:
Scientists can use radiometric dating to reconstruct the geologic history of the area and support or reject their hypothesis of a disappearing and reappearing lake by analyzing the sediments and other geological features present in the area. Radiometric dating, such as carbon-14 dating, can determine the age of the sediments, fossilized remains, and other materials. By analyzing the age and composition of these materials, scientists can track changes in the environment over time, including periods of drought or increased precipitation that could cause a lake to dry up or reform.
To ensure the accuracy of their radiometric dating, scientists can use calibration methods, such as cross-dating with other dating techniques like dendrochronology (tree-ring dating), or comparing their results with well-dated samples from similar or nearby environments. This can help validate the radiometric dating results and provide more confidence in the reconstructed geologic history and any conclusions drawn from it regarding the presence or absence of a lake in the area at different times.
Which of the following is an incorrect representation for a neutral atom?
36Li
613C
3063Cu
1530P
Answers
This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li
To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.
Let's analyze the given representations:
36Li:
This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.
613C:
This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.
3063Cu:
This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.
1530P:
This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.
Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.
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Convert 27.8 L to cm^3
Answers
Answer:
27800
Explanation:
1litre =1000cm3
27.8 ×1000
=27800cm3
PLEASE HELP ME NO ONE WILL THIS IS IMPORTANT ALOT OF POINTS! A student's favorite drink is sweet tea. Every morning he makes it by adding exactly thirty grams of sugar and one tea bag to one liter of hot water. Some days his tea does not taste as sweet as other days. Those same days he notices that there is sugar sitting at the bottom of the cup that will not dissolve no matter how long he stirs. He decided to filter out the remaining sugar and keep track of the data in the graph below.
Explain why different amounts of sugar might dissolve at different times.
Consider:
1. which day the least sugar dissolved and which day the most sugar dissolved.
2. what could have caused less sugar to dissolve on some days
3. what the student could do to his drink to make more sugar dissolve.
Be sure to consider the completeness of your response, supporting details, and accurate use of terms. Your response should be 6-8 complete sentences.
Answers
The solubility of a substance, such as sugar, depends on several factors, including temperature, pressure, and the presence of other solutes. In this case, the student adds the same amount of sugar and tea bag to the same amount of hot water every day, but the temperature of the water could vary from day to day, affecting how much sugar dissolves.
According to the graph, the least amount of sugar dissolved on day 3, while the most sugar dissolved on day 5. The difference in temperature on these days could explain this variation. On day 3, the water may have been cooler, making it more difficult for the sugar to dissolve. On the other hand, on day 5, the water may have been hotter, which could have increased the solubility of the sugar.
To increase the amount of sugar that dissolves in the tea, the student could try using hotter water or stirring the sugar more vigorously to distribute it evenly throughout the water. Alternatively, the student could try adding the sugar gradually while stirring to give it more time to dissolve before adding more.
Answer:
I'm not 100% sure on this because mine hasn't been graded yet, but here are the answers I submitted.
Explanation:
Which day the least sugar dissolved and which day the most sugar dissolved:
Day 4 is when the least sugar dissolved, and Day 2 is when the most sugar dissolved.
What could have caused less sugar to dissolve on some days:
The temperature of the tea could have caused the sugar not to dissolve on some days.
What the student could do to his drink to make more sugar dissolve.
The student would need to add the sugar to the tea as soon as it's done boiling. The Sugar will dissolve faster in a warmer tea due to more energy of movement.
Be sure to stir the tea as you add the sugar. Stirring the sugar into the tea speeds up the rate of dissolving by helping distribute the sugar particles throughout the tea.
If the student were to use granulated sugar, those are smaller particles and have greater surface area. Greater surface area allows for more contact between the tea and the sugar.
curved arrows are used to illustrate the flow of electrons. follow the arrows to predict the intermediate and product of reaction nah
Answers
The arrows are used to illustrate the flow of electrons. follow the arrows to predict the intermediate and product of reaction , the product is :
CH₃ - C -CH₃ + H₂O + ⁻OCH₃
||
O
The reaction is in between the 2 methoxypropan-2-ol and the hydroxide ion. the OH⁻ ion is the strong nucleophile and contain the negative charged. the hydroxyl group acts as a proton of the compound is acidic because of the electronegativity difference. the hydroxyl ion takes protons and form the water.
The reaction is given as follows :
OH
|
CH₃ - C - OCH₃ + OH⁻ ----> CH₃ - C -CH₃ + H₂O + ⁻OCH₃
| ||
CH₃ O
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please answer all if you can!
Answers
Answer:1.b 2.A (i think it might be c) 3 (i have no clue) 4.(no clue) Sorry i only got 1 and 2 witch i think are right its been a while sense i have done this....
Explanation:
I need help with this
Answers
As a result, the ideal gas law is applied, and the pressure of the gas in the container is 1.44 atm.
How does Charles Law compute pressure?The Kelvin temperature and hence the volume are going to be in direct proportion when the pressure on a sample of a dry gas is held constant, according to the definition of the Charles Law Formula. PV = k is the law's equation, and k might be a constant.
This issue can be resolved by applying the ideal gas law:
PV = nR
T = -52 °C + 273.15 = 221.15 K
n = 0.642 mol
V = 8.6 L
T = 221.15 K
\(R = 0.0821 L·atm/mol·K (gas constant for ideal gases)\)
PV = nRT
P = nRT/V
P = (0.642 mol)(0.0821 L·atm/mol·K)(221.15 K)/(8.6 L)
P = 1.44 atm
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If a gas occupies 4.76 L at 6.10 °C and 934 torr, what volume would it occupy at 24.0 °C and 670. torr?
Which gas law should you use?
Answers
The gas would occupy approximately 3.00 L at 24.0 °C and 670 torr.
To solve this problem, we can use the combined gas law, which relates the pressure, volume, and temperature of a gas at different conditions. The combined gas law is expressed as:
(P1 × V1) / (T1) = (P2 × V2) / (T2)
where P1, V1, and T1 are the initial pressure, volume, and temperature, respectively, and P2, V2, and T2 are the final pressure, volume, and temperature, respectively.
Using the given values, we can plug them into the equation and solve for V2:
(P1 × V1) / (T1) = (P2 × V2) / (T2)
(934 torr × 4.76 L) / (279.25 K) = (670 torr × V2) / (297.15 K)
Simplifying and solving for V2, we get:
V2 = [(934 torr × 4.76 L) / (279.25 K)] × (297.15 K / 670 torr)
V2 ≈ 3.00 L
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(a) 0.50 mol of NaCl dissolved in 0.30 L of solution
Answers
Answer:
Explanation:
To find the concentration of a solution, we need to divide the number of moles of solute by the volume of the solution in liters.
In this case, we have 0.50 mol of NaCl dissolved in 0.30 L of solution. Therefore, the concentration of the solution can be calculated as:
Concentration = moles of solute / volume of solution
Concentration = 0.50 mol / 0.30 L
Concentration = 1.67 mol/L
Therefore, the concentration of the solution is 1.67 mol/L.
What is the enthalpy for reaction 1 reversed?reaction 1 reversed: N2O4→N2 + 2O2
Express your answer numerically in kilojoules per mole.
Answers
Answer:
8kJ/mol
Explanation:
since the forward reaction is -8kJ/mol, the backward reaction has the same enthalphy but reversed
The enthalpy of the reaction is 8kj/mol because it is a reversed reaction.
Since the forward reaction is -8kj/mol, thebackward enthalpy will be 8kj/mol.
What is Enthalpy?Enthalpy is refers to the total sum of the internal energy that is sum up to the product of the pressure and volume in a system of reaction.
Therefore, The enthalpy of the reaction is 8kj/mol because it is a reversed reaction. Since the forward reaction is -8kj/mol, the backward enthalpy will be 8kj/mol.
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. What happens when metals react with water?
Answers
Answer:
Metals react with water to form oxides or hydroxides and release Hydrogen gas
Explanation:
If the enantiomeric excess of a mixture is 81 %, what are the percent compositions of the major and minor enantiomer?
Answers
Answer:
major enantiomer = 90.5 %
minor enantiomer = 9.5 %
Explanation:
Assuming that the major isomer is in excess;
From, ee/2 + 50
ee = enantiomeric excess = 81%
% major =81/2 + 50 = 90.5 %
% minor = 100% - 90.5 %
% minor = 9.5 %
during chemiosmosis, energy is released as h ions move freely across mitochondrial membranes. atp is synthesized when h ions move through a channel in atp synthase, a concentration gradient is generated when large numbers of h ions are passively transported from the matrix of the mitochondrion to the mitochondrion's intermembrane space. oh ions serve as the final electron acceptor.
Answers
During the chemiosmosis , ATP is synthesized when H⁺ ions move through a channel in ATP synthase.
The chemiosmosis is the movement of the ions through the semipermeable membrane . The ATP synthesis the free energy which is obtained by the electrons that are passes through the several carriers. chemiosmosis is the process of the pumping of the protons through the semipermeable membrane to obtained the proton gradient. the energy will be released in the process and results in the ATP synthesis.
Thus, when the H⁺ ions will move through the channel in the ATP synthase , ATP is synthesized , in the process of the chemiosmosis.
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Answer the following questions. Give details to explain your reasoning in each response. Consider the following phase change diagram. 1.) Describe the temperature of the substance from point D to point E. What is happening during this time period? (35 points) 2.) Between what points on the graph will you find a substance in the solid phase? Explain your answer. (30 points) 3.) Which phase change on the diagram requires the greatest change in energy? Explain how you reached your
Answers
The temperature of the substance from point D to point E remains constant at 0°C, indicating a phase change from a solid to a liquid state.
During this time period, the substance is melting, and the energy added to the substance is being used to break the intermolecular forces between the molecules of the solid, allowing them to move more freely and become a liquid. This phase change is known as melting or fusion, and it occurs at a constant temperature, as long as the pressure remains constant.
A substance is in the solid phase between points A and D on the graph. At point A, the temperature is -20°C, and the substance is a solid. As energy is added to the substance, the temperature increases until it reaches the melting point at point D. At this point, the substance begins to melt and becomes a liquid. Therefore, between points A and D, the substance is in the solid phase, as it has a fixed shape and volume.
The phase change that requires the greatest change in energy is the change from a solid to a gas, which is represented by the vertical line between points B and C on the graph. This phase change is known as sublimation and requires a significant amount of energy because it involves the breaking of strong intermolecular forces between the molecules in the solid, followed by the creation of new intermolecular forces between the gas molecules.
During sublimation, the substance changes from a solid to a gas without passing through the liquid phase. The energy required for sublimation is significantly higher than that required for melting or boiling because it involves breaking strong intermolecular forces in the solid state and overcoming the forces of attraction between the gas molecules.
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Which portion of a molecule of F2O has partial positive charge?
Question 3 options:
A)
The F atoms
B)
The central O atom
C)
The partial charge on each atom is zero
D)
The partial charge on each atom is negative
Answers
The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B
The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.
Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.
In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.
Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.
Option B
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c6h12o6 + 6o2 > 6 co2 + 6h2o
How many molecules of C6h12o6 are needed to produce 18 molecules of co2?
A: 3
B: 9
C: 12
D: 18
Answers
Answer:
A or 3 would be the right answer
How many elements are in a isotope?
Answers
Answer:i believe 9-?
Explanation:
boron-10
boron-11
carbon-12
carbon-13
oxygen-16
oxygen-17
oxygen-18
chlorine-35
chlorine-37
How many moles of water contain each of the following number of molecules?
4.38 × 10^21 molecules
Report your answer using appropriate number of significant figures.
Answers
In 4.38 × 10^21 molecules of water, there are approximately 0.073 moles.
To calculate the number of moles, we can use Avogadro's number, which states that 1 mole of a substance contains 6.022 × 10^23 molecules. So, by dividing the given number of molecules (4.38 × 10^21) by Avogadro's number, we can find the number of moles.
Now, let's explain the process in detail. Avogadro's number is a constant that represents the number of particles (atoms, molecules, etc.) in one mole of a substance. It is approximately 6.022 × 10^23. Therefore, if we divide the given number of molecules by Avogadro's number, we can determine the number of moles.
In this case, we divide 4.38 × 10^21 molecules by 6.022 × 10^23 molecules/mole, resulting in approximately 0.073 moles.
Significant figures play an important role in reporting the answer. The given number of molecules has three significant figures (4, 3, and 8), so our answer should be reported with three significant figures as well. Therefore, the number of moles is approximately 0.073.
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the orbitals of a principal energy level are lower in energy than the orbitals in the next higher principal energy level.
Answers
A primary energy level's orbitals have less energy than that the orbitals of the principal energy level above it.
A principle energy level's orbitals have less energy than the orbitals of the principle energy level above it. Compared to the setup 3d5 4s1, the 3d2 4s2 configuration is more reliable. The same orbital may house up to 4 e-s.
Each major energy level has a single sublevel with an s orbital, which may hold up to two electrons. The lowest energy electrons in that primary energy level are those in this orbital, known as s electrons.
The electrons at an atom's highest occupied main energy level are known as valence electrons.
Learn more about the electronic configuration at
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how many grams of kcl are produced from 11.5 grams?
Answers
Answer:
approximately 15.1 grams.
Explanation:
The key to chemistry is to change everything to moles. Then when you have the answer in moles change the answer back to grams, liters, or whatever you want.
change 25 grams of potassium chlorate to moles.
calculate the gram molecular mass of potassium chlorate.
Chlorate is Cl with 3 oxygens. ate = saturated. Chlorine has seven valance electrons when it is saturated six of these electrons are used by oxygen ( 2 electrons per oxygen) leaving only 1 electron.
1 K x 39 grams/mole
+1 Cl x 35.4 grams/ mole
+3 O x 16 grams/ mole
= 122.4 grams / mole Potassium Chlorate
25
122.4
= moles.
2.05 moles of Potassium Chlorate.
There is a 1:1 mole ratio. 1 mole of Potassium Chlorate will produce 1 mole of Potassium Chloride.
2.05 moles of Potassium Chlorate will produce 2.05 moles of Potassium Chloride.
Find the gram molecular mass of Potassium Chloride.
1 K x 39 = 39
+1 Cl x 35.4 = 35.4
= 74.4 grams / mole.
2.05 moles x 74.4 grams/ mole = 15.2 grams
Answer:
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1. Determine the electron-domain geometry and molecular geometry for each of the following.a. SBr2b. PI4+c. IBr2−2. The following three compounds all have the same general formula, XF4. Compare the electron-domain geometries of these three compounds and explain what characteristic(s) of the central atom causes differences in geometry.a. SiF4:b. SeF4:c. XeF4:
Answers
Answer:
SBr2
Electron geometry-tetrahedral; molecular geometry-trigonal pyramidal
PI4+
Electron geometry-tetrahedral; moleculargeometry-tetrahedralr
IBr2
Electron geometry - tetrahedral ; molecular shape - bent
Explanation:
We have to carefully consider the issues in question 2.
First of all, the compound SiF4 is an AX4 molecule so both it's electron domain geometry and molecular geometry are tetrahedral. The molecule has no lone pairs.
For SeF4, the compound is a molecule of the type AX4E, its molecular geometry is trigonal bipyramid but its molecular geometry is see-saw because of the presence of a lone pair of electrons on the central atom, selenium.
For XeF4, the electron domain geometry is octahedral but its molecular geometry is square planar. The molecule is of the type AX4E2 and the two lone pairs are positioned above and below the plane of the square.