Answers
Answer:
B. Liquid
B. Gas
Explanation:
I majored in Chemistry
Related Questions
Which reaction occurs at the cathode of a galvanic cell that has the following: an aluminum electrode in an electrolyte with aluminum ions and a zing electrode in an electrolyte with zinc ions? The reduction potential for the
reduction of A13+ = -1.68 V. The reduction potential for the reduction of Zn2+
-0.76 V.
O A. Zn2+ (ag) + 28
-> Zn(s)
O B. Al(s) - Al$+(34) + 3e
O C. Zn(s) -> Zn2+ (ag) + 2€
O D. AlS*(a9) + 36 -> Al(s)
Answers
The reaction that occurs at the cathode of the illustrated galvanic cell is Zn(s) -> Zn2+ (aq) + 2e-. Option C
What is reduction potential?The reaction that occurs at the cathode of a typical galvanic cell depends on the relative reduction potentials of the two half-reactions involved.
In this case, the reduction potential for the reduction of Al3+ (-1.68 V) is more negative than the reduction potential for the reduction of Zn2+ (-0.76 V). This means that the reduction of Al3+ requires more energy than the reduction of Zn2+.
Since the cathode is the site of reduction, the half-reaction with the more positive reduction potential (i.e., the reduction of Zn2+) will occur at the cathode.
Therefore, the correct answer is Zn(s) -> Zn2+ (aq) + 2e-.
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Need help with set 1 and set 2. Please help. Will be so much appreciated. Thank you
Answers
The kind of compounds that we have in the question are;
\(CH_{4}\) - Covalent
\(PBr_{2}\) - Polar covalent
\(F_{2}\) - Covalent
\(H_{2} O\)- Polar covalent
\(C_{3} H_{8}\) - covalent
\(Se_{2}\) - Covalent
NaCl - ionic
\(AlF_{3}\) - Ionic
MgO - ionic
\(Al_{2} O_{3}\) - ionic
What is the Lewis structure?Gilbert N. Lewis first suggested this kind of structure in 1916, and it is now frequently used in chemistry to show how bonds and molecule structure interact.
Atoms are represented by symbols, while the bonds between them are shown by lines. Each atom's valence electrons are shown as dots or dashes.
The covalent compounds above may or may not have a dipole moment while an ionic bond holds compounds such as NaCl. For the covalent compounds, electrons are shared as in water molecule.
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What is the relationship between polarity and intermolecular forces?
Answers
Polarity has an impact on the strength of intermolecular forces as well. Non-polar molecules only exhibit the van der Waals force as an intermolecular force.
What is the difference between polarity and intermolecular forces?The strength of intermolecular forces is also influenced by polarity. The van der Waals force is the only intermolecular force that non-polar molecules display. Dipole-dipole interactions, which are often stronger than van der Waals forces, can be used to connect polar molecules together.
As the polarity is raised, the forces between dipoles get stronger. In this situation, dipole-dipole forces are highly powerful. It is possible for it to exist between a molecule with an N, O, or F atom that has a hydrogen atom directly connected to it and another molecule with an N, O, or F atom that has a lone pair of electrons on it.
Their essential connection is that they have an inverse proportional relationship. The intermolecular space will be smaller and vice versa depending on the strength of the intermolecular force.
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A gold cube is 150.00 mm long, 10.00 cm wide, and 0.95 m thick. If gold has a density of 19.3g/cm3. Calculate the mass of the gold cube.
Help?
Answers
Answer:
V = l * w * h
V = 150.00 mm x 1cm/10 mm x 10.00 cm x 0.95 m x 100 cm/1 m = 1.4 x 104 cm3 D = M/V
M = D * V = 19.3 g/cm^3 * 1.4 * 104 cm^3 = 2.7 x 10^5 g = 270000 grams
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Which is an example of homeostasis? Choose all that apply
Select one or more:
a. internal body temperature being maintained at about 98.6 degrees
b. stomata in leaves regulate nutrients in plants
c. having diabetes
d. dog hanging out tongue to cool down
e. getting a flu shot
Answers
Answer:
the answer is a -> homeostasis is basically when your body is working to maintain what should be its standard such as temperature or the amount of water and chemicals in your body
Explanation:
FILL IN THE BLANK. [ne]3s23p3 is the electron configuration of a(n) ________ atom.
Answers
What major invention led to the cell theory?
Answers
Answer:
the microscope
Explanation:
Robert Hooke was the first to use it
Answer:
microscope
Explanation:
As the cells very too tiny to be seen by our naked eyes, so invention of microscope led to cell theory
If you put 1. 804g of sodium carbonate solid into a 250mL container and add liquid to the line what volume of solution do you need to transfer to another container to make 4. 2 mmol of solution (in mL)
Answers
The volume of the solution do you need to transfer to another container to make 4. 2 mmol of solution is 404.76 mL.
The total number of moles of solute per litre of solution is defined as the molarity of a specific solution. Because, unlike mass, the volume of a system changes with changes in physical circumstances of the system, the molality of a solution is reliant on changes in physical qualities of the system such as pressure and temperature.
M, which stands for molarity, represents molarity. The molarity of a solution is one molar when one gramme of solute is dissolved in one litre of solution.
Molarity = n x 1000 / VmL
molar mass of sodium carbonate = 106g/mol
No of moles of Na₂CO₃ = 1.804/106 = 0.017
so,
molarity = 0.017 x 1000/250
= 0.068 M
Dilution Formula:
M₁V₁ = M₂V₂
V₂ = 0.068 x 250 / 0.042
= 404.76 mL.
So, the volume is 404.76 mL.
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theoretical yield of Li2O
Answers
The pattern of inheritance in which more than one pair of genes affects a trait is *
a.)codominance
b.)incomplete dominance
c.)polygenic inheritance
d.)multiple alleles
Answers
Answer:
hello, the answer is polygenic:)
An alkyne with six carbon atoms per
molecule has relative molecular mass
of [C = 12, H = 1]
72,
82
84
86
Answers
Explanation:
C6H10
12(6) + 1(10)
= 72 + 10 = 82
The relative molecular mass of the alkyne with 6 carbon atoms is 82 gram/mole.
What is molecular mass?Molecular mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molecular mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
The molar mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.
Molecular masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.Relative molecular masses are also calculated by the same method.
In case of an alkyne with formula C₆H₁₀ relative molecular mass is calculated as, 12×6 +1×10=82 g/mole.
Hence, the relative molecular mass of an alkyne with 6 carbon atoms is 82 g/mole.
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What is the molar concentration a a 12 % sodium chloride solution (MW 58.5)
Answers
The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.
To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.
First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.
In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.
To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.
We can start by calculating the number of moles of sodium chloride in 12 grams:
Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride
Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles
Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:
Volume of solution = mass of solution / density
Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L
Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:
Molar concentration = moles of solute / volume of solution
Molar concentration = 0.205 moles / 0.1 L = 2.05 M
Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.
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How to read the volume of the solution in the buret? how to get the number, need to subtract something?
Answers
To read the volume of the solution in the buret, you need to look at the meniscus of the liquid.
The meniscus is the curved surface of the liquid, and it will indicate the level of the liquid inside the buret. You need to look at the meniscus from eye level and then read the volume of the solution at the bottom or top of the meniscus. You do not need to subtract anything when reading the volume of the solution in the buret, just read the volume directly from the meniscus.meniscus, which is the curved surface of the liquid inside the buret.
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If 30.0 grams of calcium metal react with 18.0 grams of oxygen gas, your calculations show that ________ grams of CaO could be produced from the 30.0 grams of calcium and __________ grams of CaO could be produced from the 18.0 grams of oxygen. The theoretical yield of calcium oxide from this reaction is ________.
Answers
Answer:
42g if CaO can be produced from 30g and 31.5g of CaO will be produced from 18g of O
Explanation:
40g of CA =56g
30g =×
cross multiple
=56*30/40
=42g
32g of O =56g
18g =×
cross multiple
=56*18/32
=31.5g
theoretical yield
42-31.5= 10.5
just guessing
which personal trait do scientists mainly depend upon when they design an experiment
Answers
Answer:
creativity is the personal trait that scientists mainly depend upon when they design an experiment.
Which part of the ocean has the lowest temperatures and highest salinity?
Answers
Answer:
The north atlantic contains the warmest and saltiest water of the major oceans, the southern ocean is the coldest, the north pacific has the lowest average salinity. This density signature is locked into the water parcel when it sinks
Explanation:
i think
1. 2 NH3 + 3 CuO g 3 Cu + N2 + 3 H2O In the above equation how many moles of water can be made when 36 moles of NH3 are consumed?
2. 3 Cu + 8HNO3 g 3 Cu(NO3)2 + 2 NO + 4 H2O
In the above equation how many moles of NO can be made when 86 moles of HNO3 are consumed?
3. 3 Cu + 8HNO3 --> 3 Cu(NO3)2 + 2 NO + 4 H2O
In the above equation how many moles of water can be made when 82 moles of HNO3 are consumed?
Sodium chlorate decomposes into sodium chloride and oxygen gas as seen in the equation below.
4. 2NaClO3 --> 2NaCl +3O2
How many moles of NaClO3 were needed to produce 56 moles of O2? Round your answer to the nearest whole number.
Answers
First we find the number of moles for HN3 which is 1 before multiplying it times the number before the element which is 2.
We then find the moles for H20 which is 1 before multiplying it times the number before the element which is 3. We now have 3 numbers. 36 moles NH3, 2 moles NH3, and 3 moles H20. We then cross multiple the moles of NH3 which is 36 with the moles for NH3 which is 3 making it 108 before dividing it by two which gives us 54 moles H20 as our answer.
2. 86 moles HNO3 - ? moles NO
We first find the moles for HNO3 which is 1 before multiplying it with the number in front of it which is 8. We soon find the miles for NO which is 1 before multiplying it with 2. We then cross multiply We soon multiply 86 with 2 which leads to 172 before divide by 8 which leads us with 21.5 moles NO.
3. 82 moles HNO3 - ? moles H2O
We find the moles for HNO3 which is 1 and multiply it by 8. We then get the moles for H20 which is 1 before multiplying it by 4. When then cross multiply 82 with 4 which is 328 before dividing it by 8 which leaves us with 41 moles H2O.
4. 56 moles O2 - ? moles NaClO3
We find the moles for O2 which is 1 before multiplying it with 3. We then find the moles for NaClO3 which is 1 before multiplying it with 2. We The cross multiply 56 with 2 to get 112 before dividing it by 3 which gives us 37.33 which rounds to 37 miles NaClO3.
What is the mass of an object with a density of 2g/mL that displaces 1.5mL of water?
O 0.50
O 1.75
O there is not enough information to tell
O 3
Answers
Answer:
1.75
Explanation:
if you add
For a certain polyatomic ideal gas the value of its ideal gas constant is 0.123 kJ/(kg.K). Determine a) its molecular weight (W);
Answers
The molecular weight (W) of the polyatomic ideal gas is equal to the temperature (T) divided by the volume (V) calculated as 0.123 kJ/(K).
The molecular weight (W) of the polyatomic ideal gas can be determined using the ideal gas equation:
PV = mRT
where:
P = pressure of the gas (in this case, it is not given)
V = volume of the gas (in this case, it is not given)
m = mass of the gas (in kilograms)
R = ideal gas constant (0.123 kJ/(kg.K))
T = temperature of the gas (in Kelvin)
To calculate the molecular weight (W), we need to find the value of m. Since the pressure and volume are not provided, we can rearrange the ideal gas equation as follows:
m = PV / (RT)
Now, let's assume a hypothetical situation where we have 1 kg of the polyatomic ideal gas. In this case, the mass (m) would be equal to 1 kg.
Substituting the values into the equation:
m = (1 kg) * V / (0.123 kJ/(kg.K) * T)
Here, we can see that the units of kilograms (kg) cancel out, leaving us with:
1 = V / (0.123 kJ/(K))
To isolate V, we multiply both sides of the equation by 0.123 kJ/(K):
0.123 kJ/(K) = V
Now, we have the volume (V) in cubic meters. The molecular weight (W) can be calculated using Avogadro's law, which states that equal volumes of gases, at the same temperature and pressure, contain an equal number of molecules.
To calculate the molecular weight (W), we need to determine the number of moles (n) of the gas. The number of moles can be found using the equation:
n = PV / (RT)
However, since the pressure and volume are not provided, we cannot calculate the number of moles directly. Instead, we can make use of the molar mass (M) of the gas, which is the mass of 1 mole of the gas.
The molar mass (M) is related to the molecular weight (W) as follows:
M = W / 1000
Since we assumed a mass of 1 kg earlier, the molar mass (M) can be calculated as:
M = (1 kg) / n
Substituting the value of n from the equation above:
M = (1 kg) / (PV / (RT))
M = RT / PV
Now, substituting the value of R (0.123 kJ/(kg.K)) and rearranging the equation:
M = (0.123 kJ/(kg.K)) * T / (0.123 kJ/(K) * V)
The units of kJ cancel out, leaving us with:
M = T / V
Using the value of V we calculated earlier (0.123 kJ/(K)), we can determine the molecular weight (W) of the polyatomic ideal gas.
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The variation in yearly temperature averages is the result of difference in which of the following? Please help me.
Answers
Differences in a number of factors, such as latitude, elevation, proximity to water, climate patterns, and atmospheric conditions, lead to variations in annual temperature averages.
Why is the average temperature different?The amount of radiation and energy received per unit area determines temperature changes, as is well known. Temperature generally drops from the equator to the poles as latitude increases due to a decrease in energy received per unit of surface area.
What causes fluctuations in atmospheric temperature?The decrease in temperature with height is caused by the reducing pressure. When it rises, a packet of air expands. (because of the lower pressure). Air cools down as it expands. As a result, the air above is colder than the air below.
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what being oxidized in the following reaction? h2(g) 2gacl(s) 2hcl(g) 2ga(s)
Answers
In the following reaction, the element that is being oxidized is hydrogen (H2). The oxidation state of hydrogen changes from 0 to +1 in the reaction.
The oxidation state is a measure of the degree of oxidation of an atom in a compound, and it indicates the number of electrons that an atom has lost or gained. In this reaction, the hydrogen molecule (H2) is being oxidized because it loses two electrons to form two hydrogen ions (H+). The hydrogen ions combine with chloride ions (Cl-) from the solid GaCl to form hydrochloric acid (HCl), which is a gas.
At the same time, gallium (Ga) in the solid GaCl is being reduced. Its oxidation state changes from +3 to 0 as it gains two electrons to form solid Ga metal (Ga). Therefore, this is a redox reaction, where oxidation and reduction occur simultaneously.
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when 17.08 g of an unknown non-electrolyte is dissolved in 50.0 g of carbon tetrachloride, the boiling point increased to 82.1 degrees c from 76.5 degrees c. if the kbp of the solvent is 4.95 k/m, calculate the molar mass of the unknown solute.
Answers
The molar mass of the unknown non-electrolyte solute is 19.47 g/mol.
The boiling point elevation can be used to calculate the molality of the solution, which is defined as the number of moles of solute per kilogram of solvent. This can then be used to calculate the molar mass of the solute.
The formula for boiling point elevation is:
ΔTb = Kb x molality
where ΔTb is the change in boiling point, Kb is the boiling point elevation constant for the solvent, and molality is the number of moles of solute per kilogram of solvent.
First, we need to calculate the molality of the solution:
molality = ΔTb / Kb
molality = (82.1°C - 76.5°C) / 4.95 K/m
molality = 0.0177 m
Next, we can calculate the number of moles of solute in the solution:
moles = molality x mass of solvent
moles = 0.0177 m x 50.0 g / 1000 g/kg
moles = 0.88 g
Finally, we can calculate the molar mass of the solute:
molar mass = mass of solute / moles
molar mass = 17.08 g / 0.88 moles
molar mass = 19.47 g/mol
Therefore, the molar mass of the unknown non-electrolyte solute is 19.47 g/mol.
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In Chemistry class, students have been discussing the differences between physical and chemical changes.
The students carried out several procedures and recorded their observations. The students determined that
one of the procedures is an example of a physical change, but not a chemical change.
Which of the following tests conducted shows a physical change?
A A colorless liquid changes to blue when another solution is added.
B Two clear liquids are combined, and the beaker becomes cloudy.
A cube of metal aluminum is flattened to create aluminum foil.
D Two clear liquids are combined, and the beaker becomes hot.
C
Answers
The option that shows a physical change would be a cube of aluminum metal being flattened to create aluminum foil. Option C.
What are physical changes?In chemistry, physical changes refer to reactions that only alter the physical properties of substances and not their chemical properties.
It is opposed to chemical changes which are changes that alter the chemical properties of substances, often along with their physical properties.
The changes to the color of a liquid when another liquid is added is a chemical change because the original color may not be recoverable.
The combination of two clear liquids resulting in a cloudy solution is a chemical change. So also is the combination of two clear liquids resulting in the beaker becoming hot.
The only physical change is the flattening of an aluminum cube to create aluminum foil. The chemical properties of the aluminum remain intact.
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Fossils that can be used to date rocks are known as index fossils. They have a specific set of traits. Question 1 options: easily recognized, existed over a wide area, existed for a limited/short period of time easily recognized , lived a long time, and lived in a small area easily recognized, and still are alive today easily recognized, and related to bacteria
Answers
Answer:
Answer: Easily recognized and are still alive today
Explanation:
The specific set of traits that may index fossils possess are as follows:
Existed over a wide area.Existed for a limited/short period of time. Easily recognized.What are Index fossils?An index fossil may be defined as a type of fossil which is significantly utilized in order to define and identify geologic periods. Such fossils are dead and organic remains of past organisms that were preserved and buried deep into the soil millions of years ago.
Index fossils are those fossils that are remarkably utilized in order to demonstrate the dating of rocks.
Apart from the above-mentioned traits, index fossils may also possess some traits like they are distinctive, widespread, abundant in nature, limited in the geologic time period, etc.
Therefore, the specific set of traits that may index fossils possesses is well-mentioned above.
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Which date has the longest daylight and the shortest darkness
Answers
The Winter Solstice.
2) Which element is used as fuel in nuclear reactors? How many years before we run out of it?
How long does it last in a reactor? How long does it remain dangerous after it is used?
Answers
Answer:Uranium
80 years
To make that nuclear reaction that makes that heat, those uranium pellets are the fuel. And just like any fuel, it gets used up eventually. Your 12-foot-long fuel rod full of those uranium pellet, lasts about six years in a reactor, until the fission process uses that uranium fuel up.
Transuranic wastes, sometimes called TRU, account for most of the radioactive hazard remaining in high-level waste after 1,000 years. Radioactive isotopes eventually decay, or disintegrate, to harmless materials. Some isotopes decay in hours or even minutes, but others decay very slowly.
Explanation:
Hope this helps
what is the bulk density of a dry soil sample with a
mass of 30 g that complely occupies a cylinder 6cm high and 4 cm in
diameter?
Answers
Answer:
397,570 g/m^3
Explanation:
The volume of the cylinder can be calculated using its height and diameter.
Mass of the soil sample (m) = 30 g
Height of the cylinder (h) = 6 cm
Diameter of the cylinder (d) = 4 cm
First, we need to calculate the radius (r) of the cylinder
Radius (r) = diameter / 2 = 4 cm / 2 = 2 cm = 0.02 m
Now, we can calculate the volume (V) of the cylinder
V = π * r^2 * h
V = 3.14159 * (0.02 m)^2 * 0.06 m
V = 7.5398 E-5 m^3
Calculate the bulk density (ρ) using this formula
ρ = m / V
ρ = 30 g / 7.5398 E-5 m^3
ρ = 397,887 g/m^3
5. Common (most stable) mass numbers of the following elements are Al-27, Pt-195, Co-59,
Ag-108, and Au-197 respectively. Shorthand notation is written with a mass number on the
top and atomic number on the bottom of the element symbol. Check letters a-d in 4 above
and use those as examples to write the shorthand notation of the following elements and
determine the number of neutrons in each element.
Aluminum
Platinum
Cobalt
Silver
Gold
Answers
Answer:
Number of neutrons of Al²⁷₁₃ = 14
Number of neutrons of Pt¹⁹⁵₇₈= 117
Number of neutrons of Co⁵⁹₂₇= 32
Number of neutrons of Ag¹⁰⁸₄₇= 61
Number of neutrons of Au¹⁹⁷₇₉ = 118
Explanation:
We know that atomic number of an atom is number of electron or protons while atomic mass is sum o number of neutrons and and protons.
Shorthand notations of given elements:
Al²⁷₁₃
This notation shows that atomic number of Al-27 is 13 and atomic mass is 27.
Number of neutrons of Al²⁷₁₃ = 27 - 13
Number of neutrons of Al²⁷₁₃ = 14
Pt¹⁹⁵₇₈
This notation shows that atomic number of Pt-195 is 78 and atomic mass is 195.
Number of neutrons of Pt¹⁹⁵₇₈ = 195 - 78
Number of neutrons of Pt¹⁹⁵₇₈= 117
Co⁵⁹₂₇
This notation shows that atomic number of Co-59 is 27 and atomic mass is 59.
Number of neutrons of Co⁵⁹₂₇ = 59 - 27
Number of neutrons of Co⁵⁹₂₇= 32
Ag¹⁰⁸₄₇
This notation shows that atomic number of Ag-108 is 47 and atomic mass is 108.
Number of neutrons of Ag¹⁰⁸₄₇ = 108 - 47
Number of neutrons of Ag¹⁰⁸₄₇= 61
Au¹⁹⁷₇₉
This notation shows that atomic number of Au-197 is 79 and atomic mass is 197.
Number of neutrons of Au¹⁹⁷₇₉ = 197 - 79
Number of neutrons of Au¹⁹⁷₇₉ = 118
h2so4(aq) + mg(s) → mgso4(aq) + h2(g) Which substance is the acid in the reaction?
Answers
Answer:
\( H_2SO_4\)
Explanation:
\( H_2SO_4\) (sulphuric acid) is the acid in the given reaction.
The acid present in the chemical equation is sulfuric acid with chemical formula H₂SO₄.
What is an acid?Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste.Compounds such as HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.
According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic acids depending on the number of protons which are liberated on dissociation.
Acids are widely used in industries for production of fertilizers, detergents batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.
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Convert 7g/dm^3 of H2O to mol/dm^3
Answers
Conversion of 7g/dm³ of H₂O to 0.21 mol/dm³ is
Conversion is the act or process of changing something into a different state or form
Here given data is
7g/dm³ of H₂O we have to convert it into mol/dm³ = ?
Then divide by the relative formula mass
We get H₂O then H = 1 here 2 hydrogen = 1×2 = 2 and 1 oxygen i.e 1×16 = 16 =
2×16 = 32
So, 7g/dm³/32
= 0.21 mol/dm³
7g/dm³ of H₂O to 0.21 mol/dm³
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