Based on the information provided, we can infer that the solution is either acidic or neutral since phenolphthalein turns colorless in acidic solutions and phenol red turns red in neutral or slightly basic solutions.
Therefore, the pH of the solution could be between 7 (neutral) and 4.5 (the pH at which phenolphthalein turns colorless). Without further testing or information, it is impossible to determine the exact pH of the solution.
Phenolphthalein turns colorless in acidic solutions (pH < 8.2) and phenol red turns red in acidic solutions (pH < 6.8). Since both indicators show a color change consistent with an acidic solution, the pH of the unknown solution is likely below 6.8.
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A solution of unknown pH was tested with two indicators: phenolphthalein and phenol red.
Phenolphthalein turns colorless and phenol red turns red. To determine the possible pH of the solution, let's examine the color changes of these two indicators at different pH levels.
Phenolphthalein is colorless in acidic solutions (pH < 8.2) and turns pink in basic solutions (pH > 8.2). Since it is colorless in your solution, the pH must be less than 8.2.
Phenol red turns yellow in acidic solutions (pH < 6.8), red in neutral solutions (around pH 6.8 to 8.0), and orange or pink in basic solutions (pH > 8.0). Since it turns red in your solution, the pH must be between 6.8 and 8.0.
Considering both indicators' color changes, the possible pH of your solution could be between 6.8 and 8.0.
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.One ballon is filled with Hydrogen (H2) gas, the other balloon is filled with methane (CH4). Both balloons have the same temperature, pressure, and volume. Which statement is true?
A. The balloon with CH4 has more moles of gas molecules than the balloon with H2
B. The balloon with CH4 has less moles of gas molecules than the balloon with H2
C. The balloon with CH4 has the same moles of gas molecules as the balloon with H2
D. We do not have enough information to support any of the answer choices listed above
Answer:
C. The balloon with CH4 has the same moles of gas molecules as the balloon with H2
Explanation:
Based on combined gas law, gases under the same pressure, temperature and volume have the same number of moles. With this information we can say the rigth statement is:
C. The balloon with CH4 has the same moles of gas molecules as the balloon with H2When balancing a chemical equation, the subscripts on the individual
chemical formulas can be changed.
True
False
Answer:
False
Explanation:
The subscripts of chemicals can't be changed in a chemical reaction, otherwise the products or the reactants would be a completely different molecule. We can't just change O2 to being O3, but we can change O2 into 3/2 O2 (in some cases)
Draw the Lewis dot structure of each molecule below.
Which substance has two lone pairs in its Lewis dot structure?
a
CO2
b
H2O
c
CH4
d
NH3
A pile of feathers has a mass of 57 g and a volume of 300 mL. Calculate the density.
Find the density of a brick that has a mass of 57 g and a volume of 12 mL.
A sample has a mass of 15 g and a volume of 3 mL. Calculate the density.
\(density = \frac{mass}{volume} \)
1. density = 57/300
= 0.19 g/ml
2. density = 57/12
= 4.75 g/ml
3. density = 15/3
= 5.0 g/ml
How many liters do 1.55 g of O2 occupy at STP?
The volume that is occupied by the given mass of the oxygen gas is 1.1L
What is the volume?We know that the volume has to do with the space that is occupied by a gas. Now we know that from the Avogadro's law, the volume that is occupied by a gas is called the molar volume of the gas and it has a value of 22.4 L.
We now have;
Number of moles of the gas = 1.55 g/32 g/mol
= 0.048 moles
If 1 mole of the gas occupies 22.4 L
0.048 moles of the gas is going to occupy 0.048 moles * 22.4 L/1 mole
= 1.1 L
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Given that 1 amu = 1.6606 x 10-24 grams, find the mass of a mole of methane molecules.
The mass of a mole of methane molecules is approximately 2.66 x 10^(-23) grams.
To find the mass of a mole of methane (CH4) molecules, we need to calculate the molar mass of methane and then multiply it by Avogadro's number.
The molecular formula of methane (CH4) tells us that it consists of one carbon atom (C) and four hydrogen atoms (H). To calculate the molar mass, we add up the atomic masses of each element.
Carbon (C) has an atomic mass of approximately 12.01 amu, and hydrogen (H) has an atomic mass of approximately 1.01 amu.
Molar mass of methane (CH4) = (1 x Carbon atomic mass) + (4 x Hydrogen atomic mass)
= (1 x 12.01 amu) + (4 x 1.01 amu)
= 12.01 amu + 4.04 amu
= 16.05 amu
Now, to convert the molar mass from atomic mass units (amu) to grams, we use the given conversion factor:
1 amu = 1.6606 x 10^(-24) grams
Molar mass of methane in grams = 16.05 amu * (1.6606 x 10^(-24) grams/amu)
≈ 2.66 x 10^(-23) grams
Therefore, the mass of a mole of methane molecules is approximately 2.66 x 10^(-23) grams.
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1
According to the text, what is reduction?
Read the claim and reason. Claim: The Great Wave is the most historically significant artifact within Japanese culture because it represents global changes in Japanese society. Reason: The Great Wave stands as a prominent metaphor for the changes in Japanese society because it tells us about Japan's state of mind as it stood on the threshold of the modern world in the middle of the nineteenth century. Which sentence from A History of the World in 100 Objects provides the most effective evidence to support this claim and reason?
Answer:
Follows are the solution to this question:
Explanation:
In the given question statement is not correct because in the mid 19th century. When the industrialization started underway, the great manufacturing forces, in particular, the United Kingdom and the US, would be aggressively constantly looking for new suppliers and new businesses for their industrial goods.
Calculate the energy required to heat 622 g
mercury from 37°C to 42°C. The specific
heat capacity of Hg(l) is 0.138 J/g.° C.
Answer in units of cal.
Answer:
102.58 cal.
Explanation:
Given data:
Mass of mercury = 622 g
Initial temperature = 37°C
Final temperature = 42°C
Specific heat capacity of mercury = 0.138 J/g.°C
Energy required = ?
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 42°C - 37°C
ΔT = 5°C
Q = 622 g × 0.138 J/g.°C × 5°C
Q = 429.18 J
J to cal:
429.18 J × 1 cal /4.184 j
102.58 cal.
how much energy is produced when 93.5 grams of oxygen react with 13.2 grams of hydrogen in the following reaction:
2H2+o2-->2 h2o triangleH=-572kJ
Answer:
-1670.24 kJ
QUICK Explanation:
ΔH * moles of limiting reactant = Energy produced
-572 kJ/mol * 2.92 moles of O2 = -1670.24 kJ
LONGER EXPLANATION :
2 H2 + O2 -> 2 H2O
ΔH * moles of limiting reactant = Energy produced
enthalpy change or heat of reaction formula
1. Calculate the number of moles of oxygen (O2):
Number of moles = mass / molar mass
Number of moles of O2 = 93.5 g / 32.00 g/mol
≈ 2.92 mol O2
2. Calculate the number of moles of hydrogen (H2):
Number of moles = mass / molar mass
Number of moles of H2 = 13.2 g / 2.02 g/mol
≈ 6.53 mol H2
3. Determine the limiting reactant:
According to the balanced equation,
2 moles of H2 react with 1 mole of O2.
Calculate the moles of O2 based on the moles of H2:
(6.53 mol H2) / (2 mol H2/O2) = 3.27 mol O2
we need 3.27 mol O2 to react with the available H2
BUT only have 2.92 mol of O2 available
O2 is the limiting reactant
4.
Calculate the heat given off by assuming the complete consumption of the limiting reagent
calculate the amount of energy produced using the given enthalpy change (ΔH):
Energy produced = ΔH * moles of limiting reactant
Energy produced = ΔH * moles of O2 reacted
Calculate the energy produced using the given enthalpy change (ΔH):
Energy produced = ΔH * moles of O2 reacted
= -572 kJ/mol * 2.92 mol
≈ -1670.24 kJ
Therefore, approximately -1670.24 kJ of energy is produced when 93.5 grams of oxygen react with 13.2 grams of hydrogen in the given reaction. Note that the negative sign indicates that the reaction is exothermic (energy is released).
chatgpt
You are a molecule of carbon choose a starting point in the carbon cycle and describe the process you will go through to move through the entire cycleYou are a module of carbon choose a starting point in the carbon cycle and describe the process you would go through to move through the entire cycle
Answer:
Carbon in carbon dioxide gas is taken in by plants for photosynthesis.
Plants turn the carbon atom into a carbohydrate.
An animal eats the plant and uses its carbohydrates for energy.
During respiration, the animal releases carbon dioxide back into the atmosphere.
Explanation:
Answer:
Carbon in carbon dioxide gas is taken in by plants for photosynthesis.
Plants turn the carbon atom into a carbohydrate.
An animal eats the plant and uses its carbohydrates for energy.
During respiration, the animal releases carbon dioxide back into the atmosphere.
Explanation:
a 36.0 g sample contains 14.6 g cl and 21.4 g b. what is the percent composition of chlorine in this sample by mass?
The percent composition of chlorine in the given sample is 40.6%. To determine the percent composition of chlorine, we need to calculate the mass fraction of chlorine in the sample.
We divide the mass of chlorine by the total mass of the sample and then multiply by 100 to obtain the percentage. The mass fraction of chlorine is calculated as follows:
mass fraction of chlorine = (mass of chlorine / total mass of sample) × 100
Substituting the given values, we have:
mass fraction of chlorine = (14.6 g / 36.0 g) × 100 ≈ 40.6%
Therefore, the percent composition of chlorine in the sample is approximately 40.6%.
To find the percent composition of chlorine in the sample, we consider the ratio of the mass of chlorine to the total mass of the sample. In this case, we are given that the sample contains 14.6 grams of chlorine and 21.4 grams of boron (B). By adding these masses together, we get the total mass of the sample, which is 36.0 grams.
To calculate the percent composition, we divide the mass of chlorine (14.6 g) by the total mass of the sample (36.0 g) and multiply by 100 to obtain the percentage. This calculation gives us a result of approximately 40.6%. Therefore, the percent composition of chlorine in the given sample is 40.6%.
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How many unpaired electrons does lithium have.
Answer:
Lithium only has one pair of unpaired electrons.
Explanation:
The electron configurations of two unknown elements x and y are shown. X: 1s2 2s2 2p6 Y: 1s2 2s2 2p6 3s2 3p6 Which statement is most likely correct about the two elements? A) They will react because X can give up two electrons B) They will react because X and Y can share two pairs of electrons to become stable C) They will not react because both have a complete outermost shell and are stable D) They will not react because both will give up one electron. to become stable.
Answer:
B) They will react because X and Y can share two pairs of electrons to become stable
Explanation:
The electron configurations of two elements x and y are given :
X: 1s2 2s2 2p6
Y: 1s2 2s2 2p6 3s2 3p6
The statement that is true for both the elements is that, they both will react as they both can share two pairs of electrons to become stable.
To become stable the outermost shell or p orbital should have 8 electrons, so element X can gain 2 atoms to become stable.
Element Y can also react as it can also share two atoms to fulfill its 3p orbital and will stable.
Hence, the correct option is "B".
Many species of animals, such as wildebeests, travel in herds. what effect does traveling in a herd have on wildebeests?
Traveling in a herd provides wildebeests with several benefits such as reducing the risk of predation, conserving energy, and enhancing mating opportunities.
Traveling in a herd offers different species of animals several benefits, including wildebeests. These benefits include but are not limited to:
Reduced risk of predation: Wildebeests are a prey species, and traveling together in large numbers provides them with group protection from predator attacks. The larger the herd, the more challenging it becomes for a predator to single out an individual wildebeest from the group.
Energy conservation: Traveling in a group allows wildebeests to switch between leaders and followers, enabling them to conserve energy. As they switch positions, the leading position becomes challenging, requiring more energy from those at the front of the group, while followers experience less resistance.
Enhanced mating opportunities: For wildebeests, traveling in a herd allows for greater opportunities for mating. Herds provide a chance for male wildebeests to compete for females. Traveling in herds allows individuals to increase their chances of finding a suitable mate and reduces the likelihood of inbreeding.
Improved resource discovery: A herd can cover a vast area, and the chances of discovering new food and water sources are improved with a group rather than an individual.
Social interaction: Traveling in herds also facilitates social interaction among wildebeests, forming bonds which help with activities like mating, birthing, and caring for offspring.
In conclusion, traveling in herds for wildebeests provide them with several benefits such as reduced risk of predation, energy conservation, enhanced mating opportunities, improved resource discovery, and social interaction. These benefits help wildebeests survive, increase their chances of reproducing, and enhance their overall well-being.
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If an atom has 13 electrons how many electron shells does it have
Answer:
Explanation:
If an atom has 13 electrons then it belongs to p-block of periodic table.
s level can accommodate 2 electrons.
p level can accommodate 6 electrons.
13 means 1s2 2s2 2p6 3s2 3p1.
As you can see there totally 5 sub-shells.
Total number of shells are 3(1,2,3).
If an atom has 13 electrons then it has three shells. Electrons are filled with the capacity of there orbit.
What is electronic configuration ?One orbital can house a maximum of two electrons, and there are four different types of orbitals (s, p, d, and f). More electrons can be held in the p, d, and f orbitals since they contain various sublevels.
As was said, each element's position on the periodic table determines the specific electron configuration of that element.
An atom belongs to the p-block of the periodic table if it possesses 13 electrons then its electronic configuration is;
S level has space for two electrons.
P level has a 6 electron capacity.
13 means 1s₂, 2s₂, 2p₆, 3s₂, 3p₁.
There are a total of 5 sub-shells, as you can see.
There are three shells in all 3 ( 1, 2, 3 ).
Hence, an atom having 13 electron contain three shell.
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what happend when He used uranium to shoot alpha particles at the thinnest material which was a gold foil
Ernest Rutherford used uranium to shoot alpha particles at the thinnest material, which was a gold foil.
When he shot alpha particles on gold foil, he found out that most of the alpha particles went through the foil, but some alpha particles were deflected at a high angle. This was an unexpected result that contradicted the prevailing model at the time, the plum pudding model. This discovery led to the development of the nuclear model of the atom, which explained that the nucleus contains positively charged protons and neutrons.
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40. 0% carbon, 6. 7% hydrogen, and 53. 3% oxygen with a molecular mass of 60. 0 g/mol. What is the molecular formula of the unknown compound?
The molecular formula of the unknown compound is C2H2O2.
To determine the molecular formula of the unknown compound, we need to calculate the empirical formula first and then find the multiple of its subscripts to obtain the molecular formula.
Given:
Percentage of carbon = 40.0%
Percentage of hydrogen = 6.7%
Percentage of oxygen = 53.3%
Molecular mass = 60.0 g/mol
Step 1: Convert the percentages to grams.
Assuming we have 100 grams of the compound:
Mass of carbon = 40.0 g
Mass of hydrogen = 6.7 g
Mass of oxygen = 53.3 g
Step 2: Convert the masses to moles using the molar masses of the elements.
Molar mass of carbon = 12.01 g/mol
Molar mass of hydrogen = 1.008 g/mol
Molar mass of oxygen = 16.00 g/mol
Number of moles of carbon = Mass of carbon / Molar mass of carbon
= 40.0 g / 12.01 g/mol
= 3.332 mol
Number of moles of hydrogen = Mass of hydrogen / Molar mass of hydrogen
= 6.7 g / 1.008 g/mol
= 6.648 mol
Number of moles of oxygen = Mass of oxygen / Molar mass of oxygen
= 53.3 g / 16.00 g/mol
= 3.331 mol
Step 3: Determine the empirical formula by dividing the moles by the smallest value.
Dividing the moles of carbon, hydrogen, and oxygen by 3.331 gives approximately 1 for each element.
So, the empirical formula of the compound is CHO.
Step 4: Determine the multiple of the subscripts to obtain the molecular formula.
To find the multiple, we divide the molecular mass by the empirical formula mass.
Molecular mass = 60.0 g/mol
Empirical formula mass = (12.01 g/mol) + (1.008 g/mol) + (16.00 g/mol) = 29.018 g/mol
Multiple = Molecular mass / Empirical formula mass
= 60.0 g/mol / 29.018 g/mol
= 2.07
Rounding to the nearest whole number, we get 2.
Therefore, the molecular formula of the unknown compound is C2H2O2.
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Describe the concept of using radioactive elements to establish an age for a fossil. Be sure to include how the parent and daughter elements are used in the determination of age. Answer in 1 paragraph.
Answer:
The nuclear decay of radioactive elements is a process that is a useful tool for determining the absolute age of fossils and rocks. It is used as a clock, in which daughter elements or isotopes converted from parent isotopes by decaying at a particular time.
Radioactive decay rates are constant and do not change over time. It is measured in half-life. A half-life is a time it takes half of a parent isotope to decay and converted into a stable daughter isotope. How many parent isotopes and daughter isotopes present in the fossil or their abundance can help in determining the age of fossil or rock.
What volume of 0.530 M calcium hydroxide solution is required to titrate 35.0 mL of 0.440 M phosphoric acid to the third equivalence point?
The volume of calcium hydroxide solution required to titrate 35.0 mL of 0.440 M phosphoric acid to the third equivalence point is 87.5 mL.
In the given case, we have to calculate the volume of 0.530 M calcium hydroxide solution required to titrate 35.0 mL of 0.440 M phosphoric acid to the third equivalence point.
The chemical equation for the reaction of phosphoric acid with calcium hydroxide is given below:
H₃PO₄ + Ca(OH)₂ → Ca(H₂PO₄)₂ + 2H₂O
Molar mass of H₃PO₄ = 3(1.008) + 1(30.974) + 4(15.999)
= 98.0 g/mol
Molar mass of Ca(OH)₂ = 1(40.078) + 2(15.999)
= 74.1 g/mol
Number of moles of H₃PO₄ in 35.0 mL of 0.440 M
phosphoric acid= Molarity × Volume(in liters)
= 0.440 × (35.0/1000)
= 0.0154 mol
Number of moles of Ca(OH)₂ required to react completely with 0.0154 mol of H₃PO₄= 0.0154 mol
Number of moles of Ca(OH)₂ present in the solution
= Molarity × Volume(in liters)
= 0.530 × Volume
Calcium hydroxide will react with phosphoric acid until the third equivalence point is reached.
Ca(OH)₂ + 2H₃PO₄ → Ca(H₂PO₄)₂ + 2H₂O(moles)
0.0154 0.031 0.0464
(Molarity) 0.53 0.53 0.53
(Volume) V₁ V₂ V₃
Equivalence point is the point where the number of moles of two reactants is equal to each other.The number of moles of H₃PO₄ is equal to the number of moles of Ca(OH)₂ at the third equivalence point,
So, 0.0464 mol of Ca(OH)₂ is required to react completely with 0.0154 mol of H₃PO₄ .
Volume of 0.530 M calcium hydroxide solution required to titrate 35.0 mL of 0.440 M phosphoric acid to the third equivalence point
= (0.0464 mol)/(0.530 mol/L)
= 0.0875
L= 87.5 mL (rounded to three significant figures)
Therefore, the volume of 0.530 M calcium hydroxide solution required to titrate 35.0 mL of 0.440 M phosphoric acid to the third equivalence point is 87.5 mL.
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what is the hardest metal?
1. Cesium
2. Titanium
3. Chromium
4. Magnesium
Quickly please!
Answer:
i believe it is titanium.
Explanation:
Answer:
2. Chromium
Explanation:
NMR signals may consist of a single peak, or they may be ____ into several peaks. The number of peaks for a particular signal is called its _______.
NMR signals might be split into multiple peaks or can have just one peak. The multiplicity of a given signal is its total number of peaks.
Multiplicity is an indication of the number of equivalent hydrogen atoms that are bonded to the particular carbon atom that produces the NMR signal. For a single peak, the multiplicity is 1. This means that only one hydrogen atom is bonded to the carbon atom, and all of the hydrogen atoms are chemically identical. For a double peak, the multiplicity is 2. This means that two hydrogen atoms are bonded to the carbon atom, and the two hydrogen atoms are chemically different. For a triple peak, the multiplicity is 3. This means that three hydrogen atoms are bonded to the carbon atom, and the three hydrogen atoms are chemically different. For a quartet peak, the multiplicity is 4. This means that four hydrogen atoms are bonded to the carbon atom, and the four hydrogen atoms are chemically different. The multiplicity of an NMR signal is an important factor in determining the structure of the molecule, as it can help to identify the type of bonds that exist between the atoms.
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Universal indicator is added to water and then nitric acid is added to the mixture.Give the colour change when nitric acid is added to the mixture of universal indicator and water.
The colour change when nitric acid is added to the mixture of universal indicator and water can range from yellow/orange to red/dark red.
Universal indicator explained.
When nitric acid is added to a mixture of water and universal indicator, the color change depends on the concentration of the acid.
At low concentrations of nitric acid, the universal indicator will turn yellow or orange, indicating a slightly acidic solution. As the concentration of nitric acid increases, the color will shift towards red, indicating a more acidic solution. At very high concentrations, the solution may turn dark red, indicating a strongly acidic solution.
The reason for this color change is that universal indicator is a pH indicator that contains a mixture of dyes that change color depending on the pH of the solution. Nitric acid is a strong acid that dissociates completely in water, producing H+ ions that lower the pH of the solution. As the pH decreases, the color of the universal indicator changes from green to yellow to orange to red.
Therefore, the color change when nitric acid is added to a mixture of water and universal indicator depends on the concentration of the acid and can range from yellow/orange to red/dark red.
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A nurse is preparing to administer multiple medications to a client who has an enteral feeding tube. Which of the following actions should the nurse plan to take?
Flush the tube with 15 mL of sterile water
* Each medication should be dissolved in at least 30 mL of warm sterile water
* Medications should be drawn up separately
* If the nurse encounters resistance when adm. meds, he should stop and contact the provider
When administering multiple medications to a client with an enteral feeding tube, the nurse should take several precautions to ensure the safe and effective delivery of the drugs.
Firstly, the nurse should flush the tube with 15 mL of sterile water before administering any medications to clear any residual feedings or other substances from the tube. Secondly, each medication should be dissolved in at least 30 mL of warm sterile water to prevent clogging and ensure that the medication is delivered properly. Thirdly, medications should be drawn up separately to avoid any potential interactions or incompatibilities between different drugs. Finally, if the nurse encounters resistance when administering medications, they should stop and contact the provider for further instructions. By following these guidelines, the nurse can help ensure that the client receives the full therapeutic benefit of each medication while minimizing the risk of adverse effects or complications.
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27.5 cm³ of a solution of NaOH neutralizes 25.0cm³ of 0.5 MHCL solution. Calculate the
concentration of NaOH in
b. gdm
a. Moldm-3
a)The concentration of NaOH in g/dm³ is approximately 18.18 g/dm³, and b)The concentration in mol/dm³ is approximately 0.4545 mol/dm³.
a)To calculate the concentration of NaOH in g/dm³ (grams per cubic decimeter) and mol/dm³ (moles per cubic decimeter), we need to know the amount of NaOH used in the reaction and the volume of the NaOH solution.
From the given information, we have:
Volume of NaOH solution = 27.5 cm³
Volume of HCl solution = 25.0 cm³
Molarity of HCl solution = 0.5 M
Since the reaction between NaOH and HCl is a 1:1 stoichiometric ratio, the moles of NaOH used can be determined from the moles of HCl used:
Moles of HCl = Molarity × Volume = 0.5 M × 25.0 cm³ = 12.5 mmol (millimoles)
Since the moles of NaOH used is also equal to the moles of HCl, we have:
Moles of NaOH = 12.5 mmol
b)To calculate the concentration of NaOH in g/dm³, we need to convert moles to grams using the molar mass of NaOH, which is approximately 40 g/mol:
Mass of NaOH = Moles × Molar mass = 12.5 mmol × 40 g/mol = 500 g
Now, we can calculate the concentration in g/dm³:
Concentration of NaOH (g/dm³) = Mass of NaOH / Volume of NaOH solution
= 500 g / 27.5 cm³
≈ 18.18 g/dm³
To calculate the concentration of NaOH in mol/dm³, we can use the same approach:
Concentration of NaOH (mol/dm³) = Moles of NaOH / Volume of NaOH solution
= 12.5 mmol / 27.5 cm³
≈ 0.4545 mol/dm³
Therefore, the concentration of NaOH in g/dm³ is approximately 18.18 g/dm³, and the concentration in mol/dm³ is approximately 0.4545 mol/dm³.
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name four physical quantities that are conserved and two quantities that are not conserved during a process
Four physical quantities that are conserved during a process include energy, momentum, angular momentum, and electric charge. On the other hand, two quantities that are not conserved during a process are mechanical energy and mass.
Energy conservation states that the total energy of an isolated system remains constant, as energy can neither be created nor destroyed, only converted from one form to another. Momentum conservation asserts that the total momentum of a system remains constant, provided no external forces act on it. Similarly, the conservation of angular momentum dictates that the total angular momentum of an isolated system remains constant if no external torques are applied. Lastly, electric charge conservation states that the net electric charge within an isolated system remains constant, as charges can neither be created nor destroyed, only redistributed or transferred.
Mechanical energy, which comprises kinetic and potential energy, may not be conserved in non-conservative systems, such as those experiencing dissipative forces like friction or air resistance. In these cases, some mechanical energy is lost as thermal energy or other forms of energy. Mass conservation is not always maintained at the subatomic level, particularly during processes like nuclear reactions, where mass can be converted into energy following Einstein's mass-energy equivalence principle, E=mc².
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6. how does a non polar column separate mixture of compounds and how does a polar column separate mixture of compounds
The capacity of stationary phases used in high performance liquid chromatography (HPLC) to distinguish between polar column and nonpolar chemicals can be used to classify them.
In HPLC, how do you distinguish polar compounds?Extremely polar chemicals, which are difficult to separate under reversed-phase conditions, can be retained and separated successfully using hypercarb columns. This application has shown that: Polar chemical retention is good in hypercarb columns. The techniques created on Hypercarb columns are solid.
How can you distinguish between polar and nonpolar bonds?(We define a bond to be polar if there is a difference between the electronegativity of the atoms in the bond that is more than 0.4. The bond is effectively nonpolar if the difference in electronegativity is smaller than 0.4.) The molecule is nonpolar if there are no polar bonds.
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Which element would you predict to have the highest first ionization energy? Why?
a) neon or carbon
b) fluorine or francium
c) beryllium or strontium
d) iodine or fluorine
how james chadwick knows that neutron is neutral
Answer
In 1932, Chadwick made a fundamental discovery in the domain of nuclear science: he proved the existence of neutrons – elementary particles devoid of any electrical charge. In contrast with the helium nuclei (alpha rays) which are charged, and therefore repelled by the considerable electrical forces present in the nuclei of heavy atoms, this new tool in atomic disintegration need not overcome any electric barrier and is capable of penetrating and splitting the nuclei of even the heaviest elements. Chadwick in this way prepared the way towards the fission of uranium 235 and towards the creation of the atomic bomb. For this epoch-making discovery he was awarded the Hughes Medal of the Royal Society in 1932, and subsequently the Nobel Prize for Physics in 1935.
Explanation:
In 1932, Chadwick made a fundamental discovery in the domain of nuclear science: he proved the existence of neutrons – elementary particles devoid of any electrical charge.
Vinegar is an ingredient commonly used by chefs. Scientists also use it as well, although they call it acetic acid. When vinegar is in its liquid or solid (frozen) states, it has a fixed volume. But when vinegar is in its gas state, it takes up the entire volume of whatever container it is in. This is why you can smell an open bottle of vinegar the minute you walk into a kitchen, even though you cannot actually see the gas particles!
Which statement best explains why the volume of vinegar gas is changeable as opposed to the fixed volume of its solid and liquid states?
A. Gas particles are always at a higher pressure than solids and liquids.
B. Gas particles are always at a higher temperature than solids and liquids.
C. Gas particles are spaced far apart and can move freely.
D. Gas particles stay close together but can move around each other.
Answer: C
Explanation: Because gas particles are free to move fast where as liquid can move a little but solid cant so it would be C
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