Question 1

Which of these is a benefit of water's unique freezing properties?

Accepted Answer

Water's unique property of expanding and becoming less dense when it freezes causes ice to form on the surface of bodies of water, creating an insulating layer that helps protect aquatic life during cold weather.

Question 2

A 1.00 M solution is equivalent to:

Accepted Answer

The molarity (M) of a solution is a measure of the number of moles of solute per liter of solution, and without knowing the molar mass of the solute, we cannot convert it to ppm, %, or ppb.

Question 3

A 5% acetic acid solution contains ____ grams of acetic acid per ____ grams of solution.

Accepted Answer

The answer of A 5% acetic acid solution contains ____...

Question 4

How many grams of CaCl₂ are in 35.00 mL of a 0.237 M solution of CaCl₂? (molar mass CaCl₂ = 111 g\mol)

Accepted Answer

The answer of How many grams of CaCl₂ are in...

Question 5

What is the concentration in molarity of a solution made by dissolving 20.0 grams of KOH in 150. mL of H₂O?

Accepted Answer

To find the molarity, first calculate the moles of KOH: Molar mass of KOH = 39.1 (K) + 16.0 (O) + 1.0 (H) = 56.1 g/mol. Moles of KOH = 20.0 g / 56.1 g/mol = 0.356 mol. Convert 150 mL to liters: 150 mL = 0.150 L. Molarity (M) = moles/volume (L) = 0.356 mol / 0.150 L = 2.37 M.

Question 6

Drinking water contains 175 ppm of dissolved CaCO₃ per liter. How many grams of CaCO₃ are in 2.00 L of water?

Accepted Answer

175 ppm means 175 mg of CaCO3 per liter. Therefore, in 2.00 L of water, there are 2 x 175 mg = 350 mg, which is 0.350 g of CaCO3.

Question 7

Which of these substances makes up the largest fraction of water on the planet?

Accepted Answer

Oceans make up the largest fraction of water on the planet, accounting for approximately 97% of all water.

Question 8

What are the units of molarity?

Accepted Answer

Molarity is defined as the number of moles of solute per liter of solution, so its units are moles per liter.

Question 9

Which of these statements about water is correct ?

Accepted Answer

A) Water has a high boiling point compared to other liquids, due to its strong hydrogen bonds.
B) Water expands when it freezes, which is why ice floats on liquid water.
C) Water is the most abundant liquid on the planet, covering approximately 71% of the Earth's surface.
D) Water molecules form hydrogen bonds, which gives water unique properties like high surface tension and the ability to dissolve many substances.

Question 10

Ethylene glycol is the primary component in antifreeze. How many grams of ethylene glycol, C₂H₄(OH)₂ are in 394 mL of a 9.087 M solution of antifreeze? (molar mass C₂H₄(OH)₂ = 62 g\mol)

Accepted Answer

To find the grams of ethylene glycol, use the formula: grams = molarity × volume (L) × molar mass. Convert 394 mL to liters (0.394 L), then multiply by the molarity (9.087 M) and the molar mass (62 g/mol): 0.394 L × 9.087 mol/L × 62 g/mol = 222 g.

Question 11

What is the concentration in molarity when 10.00 grams of K₃PO₄ is dissolved in H₂O to give 350. mL of solution? (molar mass of K₃PO₄ = 212.3 g\mol)

Accepted Answer

The answer of What is the concentration in molarity when...

Question 12

Which of these is \are  not a unique property \properties of water?
I. Expands when it freezes
II. Nonpolar molecules
III. A good solvent

Accepted Answer

Nonpolar molecules are not a property of water; water is a polar molecule.

Question 13

What fraction of water on the planet is in readily usable forms like streams and lakes?

Accepted Answer

Only about 0.014% of the Earth's water is found in readily accessible forms like streams, lakes, and rivers. Most of the Earth's water is in the oceans, ice caps, and glaciers, or is otherwise inaccessible.

Question 14

What is the percent by mass of hydrogen gas dissolved in palladium metal if 0.89 g of hydrogen is in 215 g of palladium metal?

Accepted Answer

The percent by mass is calculated by dividing the mass of hydrogen by the total mass (hydrogen + palladium) and multiplying by 100. (0.89 g / (0.89 g + 215 g)) * 100 = 0.41%.

Question 15

A 4.50 L sample of sea water which contains 32.7 mg of strontium. Determine the concentration of strontium in mg\L.

Accepted Answer

The answer of A 4.50 L sample of sea water...

Question 16

Which of these is not a unit for measuring the concentration of solutions?

Accepted Answer

atm (atmosphere) is a unit for measuring pressure, not the concentration of solutions. The other options are valid units for measuring concentration: M (molarity), m (molality), ppm (parts per million), and mg/L (milligrams per liter).

Question 17

What is the concentration of a solution made by dissolving 90.0 g of acetic acid, CH₃COOH, in water to give .250 L of solution? (molar mass CH₃COOH = 60.0 g\mol)

Accepted Answer

The answer of What is the concentration of a solution...

Question 18

Which of these is not a method for measuring the concentration of a solution?

Accepted Answer

All the listed methods (percent by mass, percent by volume, molarity, and parts per million) are valid methods for measuring the concentration of a solution.

Question 19

A part per million is roughly equivalent to:

Accepted Answer

A part per million (ppm) is equivalent to 1 milligram per liter (mg/L) in water solutions.

Question 20

1.00 ppm is equivalent to:

Accepted Answer

1.00 ppm (parts per million) is equivalent to 0.000100 % because 1 ppm is 1 part in 1,000,000 parts, which translates to 0.0001% when converted to a percentage.

Quiz 12: The Liquids and Solids Around Us: Especially Water

Which of these is a benefit of water's unique freezing properties?

A 1.00 M solution is equivalent to:

A 5% acetic acid solution contains grams of acetic acid per grams of solution.

How many grams of CaCl₂ are in 35.00 mL of a 0.237 M solution of CaCl₂? (molar mass CaCl₂ = 111 g\mol)

What is the concentration in molarity of a solution made by dissolving 20.0 grams of KOH in 150. mL of H₂O?

Drinking water contains 175 ppm of dissolved CaCO₃ per liter. How many grams of CaCO₃ are in 2.00 L of water?

Which of these substances makes up the largest fraction of water on the planet?

What are the units of molarity?

Which of these statements about water is correct ?

Ethylene glycol is the primary component in antifreeze. How many grams of ethylene glycol, C₂H₄(OH) ₂ are in 394 mL of a 9.087 M solution of antifreeze? (molar mass C₂H₄(OH) ₂ = 62 g\mol)

What is the concentration in molarity when 10.00 grams of K₃PO₄ is dissolved in H₂O to give 350. mL of solution? (molar mass of K₃PO₄ = 212.3 g\mol)

Which of these is \are not a unique property \properties of water? I. Expands when it freezes II. Nonpolar molecules III. A good solvent

What fraction of water on the planet is in readily usable forms like streams and lakes?

What is the percent by mass of hydrogen gas dissolved in palladium metal if 0.89 g of hydrogen is in 215 g of palladium metal?

A 4.50 L sample of sea water which contains 32.7 mg of strontium. Determine the concentration of strontium in mg\L.

Which of these is not a unit for measuring the concentration of solutions?

What is the concentration of a solution made by dissolving 90.0 g of acetic acid, CH₃COOH, in water to give .250 L of solution? (molar mass CH₃COOH = 60.0 g\mol)

Which of these is not a method for measuring the concentration of a solution?

A part per million is roughly equivalent to:

1.00 ppm is equivalent to:

Quiz 12: The Liquids and Solids Around Us: Especially Water

Which of these is a benefit of water's unique freezing properties?

A 1.00 M solution is equivalent to:

A 5% acetic acid solution contains ____ grams of acetic acid per ____ grams of solution.

How many grams of CaCl2 are in 35.00 mL of a 0.237 M solution of CaCl2? (molar mass CaCl2 = 111 g\mol)

What is the concentration in molarity of a solution made by dissolving 20.0 grams of KOH in 150. mL of H2O?

Drinking water contains 175 ppm of dissolved CaCO3 per liter. How many grams of CaCO3 are in 2.00 L of water?

Which of these substances makes up the largest fraction of water on the planet?

What are the units of molarity?

Which of these statements about water is correct ?

Ethylene glycol is the primary component in antifreeze. How many grams of ethylene glycol, C2H4(OH) 2 are in 394 mL of a 9.087 M solution of antifreeze? (molar mass C2H4(OH) 2 = 62 g\mol)

What is the concentration in molarity when 10.00 grams of K3PO4 is dissolved in H2O to give 350. mL of solution? (molar mass of K3PO4 = 212.3 g\mol)

Which of these is \are not a unique property \properties of water? I. Expands when it freezes II. Nonpolar molecules III. A good solvent

What fraction of water on the planet is in readily usable forms like streams and lakes?

What is the percent by mass of hydrogen gas dissolved in palladium metal if 0.89 g of hydrogen is in 215 g of palladium metal?

A 4.50 L sample of sea water which contains 32.7 mg of strontium. Determine the concentration of strontium in mg\L.

Which of these is not a unit for measuring the concentration of solutions?

What is the concentration of a solution made by dissolving 90.0 g of acetic acid, CH3COOH, in water to give .250 L of solution? (molar mass CH3COOH = 60.0 g\mol)

Which of these is not a method for measuring the concentration of a solution?

A part per million is roughly equivalent to:

1.00 ppm is equivalent to:

A 5% acetic acid solution contains grams of acetic acid per grams of solution.

How many grams of CaCl₂ are in 35.00 mL of a 0.237 M solution of CaCl₂? (molar mass CaCl₂ = 111 g\mol)

What is the concentration in molarity of a solution made by dissolving 20.0 grams of KOH in 150. mL of H₂O?

Drinking water contains 175 ppm of dissolved CaCO₃ per liter. How many grams of CaCO₃ are in 2.00 L of water?

Ethylene glycol is the primary component in antifreeze. How many grams of ethylene glycol, C₂H₄(OH) ₂ are in 394 mL of a 9.087 M solution of antifreeze? (molar mass C₂H₄(OH) ₂ = 62 g\mol)

What is the concentration in molarity when 10.00 grams of K₃PO₄ is dissolved in H₂O to give 350. mL of solution? (molar mass of K₃PO₄ = 212.3 g\mol)

What is the concentration of a solution made by dissolving 90.0 g of acetic acid, CH₃COOH, in water to give .250 L of solution? (molar mass CH₃COOH = 60.0 g\mol)