Question 1

What is the concentration in molarity when 10.00 grams of K ₃ PO ₄ is dissolved in H ₂ O to give 350.0 mL of solution (molar mass of K ₃ PO ₄ = 212.3 g/mol)?

Accepted Answer

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

Question 2

A 4.50 L sample of sea water 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 3

Drinking water contains 175 ppm of dissolved CaCO ₃ per liter. How many grams of CaCO ₃ are present 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 350 mg of CaCO3, which is equivalent to 0.350 g.

Question 4

How many grams of CaCl ₂ are present in 35.00 mL of a 0.237 M solution of CaCl ₂ (molar mass CaCl ₂ = 111 g/mol)?

Accepted Answer

First, calculate the number of moles of CaCl2 in the solution:
0.237 M × 0.03500 L = 0.008295 mol CaCl2
Then, use the molar mass of CaCl2 to convert moles to grams:
0.008295 mol CaCl2 × 111 g/mol = 0.920 g CaCl2

Question 5

What is the concentration of a solution made by dissolving 90.0 g of acetic acid (CH ₃ COOH) in water that gives 0.250 L of solution (molar mass of CH ₃ COOH = 60.0 g/mol)?

Accepted Answer

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

Question 6

What is the unit of molarity?

Accepted Answer

Molarity is defined as the number of moles of solute per liter of solution. Therefore, its unit is moles per liter (mol/L).

Question 7

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

Accepted Answer

A 5% acetic acid solution means there are 5 grams of acetic acid per 100 grams of solution. Therefore, for 1000 grams of solution, there would be 50 grams of acetic acid.

Question 8

What is the concentration in molarity of a solution made by dissolving 20.0 grams of KOH in 150.0 mL of H ₂ O (molar mass of KOH = 56.1056 g/mol)?

Accepted Answer

First, convert the volume to liters:

150.0 mL = 0.150 L

Next, use the formula:

Molarity (M) = moles of solute / liters of solution

To find the moles of KOH, divide the mass by the molar mass:

20.0 g / 56.1056 g/mol = 0.356 moles

Now plug in the values:

Molarity (M) = 0.356 moles / 0.150 L = 2.37 M

Therefore, the answer is C.

Question 9

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

Accepted Answer

The percent by mass of hydrogen in the palladium metal is calculated using the formula: (mass of hydrogen / total mass) * 100. So, (0.89 g / (215 g + 0.89 g)) * 100 = (0.89 / 215.89) * 100 ≈ 0.41%.

Question 10

Ethylene glycol is the primary component in antifreeze. How many grams of ethylene glycol (C ₂ H ₄ (OH) ₂ ) are present in 394 mL of a 9.087 M solution of antifreeze (molar mass C ₂ H ₄ (OH) ₂ = 62 g/mol)?

Accepted Answer

First, we need to use the molarity equation to find the number of moles of ethylene glycol present in the solution:

Molarity = moles of solute / liters of solution

Rearranging the equation gives:

moles of solute = Molarity x liters of solution

Converting the volume of the solution from milliliters to liters, we have:

394 mL = 0.394 L

Substituting the values we have:

moles of solute = 9.087 mol/L x 0.394 L = 3.582 g

Next, we need to convert moles to grams using the molar mass of ethylene glycol:

3.582 mol x 62 g/mol = 221.84 g

Rounding to the nearest tenth gives the final answer of:

222 g

Question 11

Which of these is/are  not unique property/properties of water?
I. Water expands on freezing.
II. Water molecules are nonpolar.
III. Water is a good solvent.

Accepted Answer

Water expanding on freezing (I) and being a good solvent (III) are unique properties of water. However, water molecules are polar, not nonpolar (II).

Question 12

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

Accepted Answer

Atm stands for atmospheres and is a unit of pressure, not a unit for measuring the concentration of solutions. The other choices are commonly used units for expressing the concentration of solutions.

Question 13

Which of these substances make(s) up the largest fraction of water on the planet?

Accepted Answer

Oceans make up more than 70% of the Earth's surface, and therefore comprise the largest fraction of water on the planet.

Question 14

Which of the following is the equivalent of 1.00 M?

Accepted Answer

The molarity (M) of a solution is defined as moles of solute per liter of solution. Without knowing the molar mass of the solute or the density of the solution, it is impossible to convert molarity to ppm, %, or ppb.

Question 15

Which of these statements about water is correct?

Accepted Answer

All of these statements about water are correct. Water has a high boiling point due to its strong intermolecular forces. Water expands when it freezes because its solid form (ice) has a lower density than its liquid form. Water is the most abundant liquid on the planet, covering more than 70% of the Earth's surface. Water molecules are polar, allowing them to form hydrogen bonds with each other, which contributes to many of water's unique properties.

Question 16

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

Accepted Answer

The vast majority of Earth's water is salt water in the oceans. Of the freshwater, a significant portion is locked up in glaciers, ice caps, and underground. Only about 0.014% of the planet's water is in readily usable forms such as streams, rivers, and lakes.

Question 17

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

Accepted Answer

Milliliters per gram is not a method for measuring the concentration of a solution. The other options (percent by mass, percent by volume, molarity, and parts per million) are common methods for expressing the concentration of a solution.

Question 18

For solutions in water , a part per million is roughly equivalent to _____.

Accepted Answer

A part per million (ppm) is a unit of concentration that denotes a ratio of the substance's mass to the mass of the solution or medium, multiplied by one million. In the case of solutions in water, one part per million is approximately equivalent to one milligram per liter (mg/L), which is option D. Option C (g/L) is not correct because it represents a concentration that is 1000 times greater than ppm, and options A, B, and E do not represent commonly used units of concentration for solutions in water.

Question 19

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

Accepted Answer

Water's unique freezing properties allow it to form a layer of ice on the surface of lakes, which acts as an insulator and keeps the water underneath from freezing solid. This allows marine life to survive the winter.

Question 20

Which of the following is the equivalent of 1.00 ppm?

Accepted Answer

1 ppm means 1 part per million, which is equivalent to 1 part in 1,000,000 parts. In percentage terms, this is 1/10,000 of 1%, or 0.0001%.

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

What is the concentration in molarity when 10.00 grams of K ₃ PO ₄ is dissolved in H ₂ O to give 350.0 mL of solution (molar mass of K ₃ PO ₄ = 212.3 g/mol) ?

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

Drinking water contains 175 ppm of dissolved CaCO ₃ per liter. How many grams of CaCO ₃ are present in 2.00 L of water?

How many grams of CaCl ₂ are present in 35.00 mL of a 0.237 M solution of CaCl ₂ (molar mass CaCl ₂ = 111 g/mol) ?

What is the concentration of a solution made by dissolving 90.0 g of acetic acid (CH ₃ COOH) in water that gives 0.250 L of solution (molar mass of CH ₃ COOH = 60.0 g/mol) ?

What is the unit of molarity?

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

What is the concentration in molarity of a solution made by dissolving 20.0 grams of KOH in 150.0 mL of H ₂ O (molar mass of KOH = 56.1056 g/mol) ?

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

Ethylene glycol is the primary component in antifreeze. How many grams of ethylene glycol (C ₂ H ₄ (OH) ₂ ) are present in 394 mL of a 9.087 M solution of antifreeze (molar mass C ₂ H ₄ (OH) ₂ = 62 g/mol) ?

Which of these is/are not unique property/properties of water? I. Water expands on freezing. II. Water molecules are nonpolar. III. Water is a good solvent.

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

Which of these substances make(s) up the largest fraction of water on the planet?

Which of the following is the equivalent of 1.00 M?

Which of these statements about water is correct?

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

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

For solutions in water , a part per million is roughly equivalent to _____.

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

Which of the following is the equivalent of 1.00 ppm?

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

What is the concentration in molarity when 10.00 grams of K 3 PO 4 is dissolved in H 2 O to give 350.0 mL of solution (molar mass of K 3 PO 4 = 212.3 g/mol) ?

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

Drinking water contains 175 ppm of dissolved CaCO 3 per liter. How many grams of CaCO 3 are present in 2.00 L of water?

How many grams of CaCl 2 are present in 35.00 mL of a 0.237 M solution of CaCl 2 (molar mass CaCl 2 = 111 g/mol) ?

What is the concentration of a solution made by dissolving 90.0 g of acetic acid (CH 3 COOH) in water that gives 0.250 L of solution (molar mass of CH 3 COOH = 60.0 g/mol) ?

What is the unit of molarity?

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

What is the concentration in molarity of a solution made by dissolving 20.0 grams of KOH in 150.0 mL of H 2 O (molar mass of KOH = 56.1056 g/mol) ?

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

Ethylene glycol is the primary component in antifreeze. How many grams of ethylene glycol (C 2 H 4 (OH) 2 ) are present in 394 mL of a 9.087 M solution of antifreeze (molar mass C 2 H 4 (OH) 2 = 62 g/mol) ?

Which of these is/are not unique property/properties of water? I. Water expands on freezing. II. Water molecules are nonpolar. III. Water is a good solvent.

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

Which of these substances make(s) up the largest fraction of water on the planet?

Which of the following is the equivalent of 1.00 M?

Which of these statements about water is correct?

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

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

For solutions in water , a part per million is roughly equivalent to _____.

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

Which of the following is the equivalent of 1.00 ppm?

What is the concentration in molarity when 10.00 grams of K ₃ PO ₄ is dissolved in H ₂ O to give 350.0 mL of solution (molar mass of K ₃ PO ₄ = 212.3 g/mol) ?

Drinking water contains 175 ppm of dissolved CaCO ₃ per liter. How many grams of CaCO ₃ are present in 2.00 L of water?

How many grams of CaCl ₂ are present in 35.00 mL of a 0.237 M solution of CaCl ₂ (molar mass CaCl ₂ = 111 g/mol) ?

What is the concentration of a solution made by dissolving 90.0 g of acetic acid (CH ₃ COOH) in water that gives 0.250 L of solution (molar mass of CH ₃ COOH = 60.0 g/mol) ?

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

What is the concentration in molarity of a solution made by dissolving 20.0 grams of KOH in 150.0 mL of H ₂ O (molar mass of KOH = 56.1056 g/mol) ?

Ethylene glycol is the primary component in antifreeze. How many grams of ethylene glycol (C ₂ H ₄ (OH) ₂ ) are present in 394 mL of a 9.087 M solution of antifreeze (molar mass C ₂ H ₄ (OH) ₂ = 62 g/mol) ?