Chemistry Solutions Review

What is the molarity of a solution that contains 30. grams of NaOH in 500. milliliters of solution? 1. 0.75 M 2. 1.3 M 3. 1.5 M 4. 2.6 M

1.5 M

What is the gram formula mass for Ca3(PO4)2?

310. g/mol

What is the percent by mass of nitrogen in the compound NH4NO3 (formula mass = 80.)?

35%

Based on the Reference table F, which of the following saturated solutions would be the least concentrated?

Barium Sulfate

At STP,which of these substances is most soluble in H(2)O?

HCl is a polar substance. It will be soluble in a polar solvent such as H(2)O

An unsaturated solution is formed when 80 grams of salt is dissolved in 100 grams of water at 40c..?

NaNO3

Which compound is insoluble in water?

Silver Bromide

What is a correct numerical setup for calculating the number of moles of Ca(NO3)2 needed to make 0.250 liter of the 0.200 M calcium nitrate solution?

(0.250 L ) * (0.200 mol) / (1L)

1.What is the concentration of a solution, in parts per million, if 0.02 gram of Na3PO4 is dissolved in 1000 grams of water? 1. 20 ppm 2. 2 ppm 3. 0.2 ppm 4. 0.02 ppm

1. 20 ppm

What is the molarity of a solution that contains 0.50 mole of NaOH in 0.50 liter of solution?

1.0 M

What is the molarity of 1.5 liters of an aqueous solution that contains 52 grams of lithium fluoride, LiF, (gram-formula mass =26 grams/mole)?

1.3 M

What is the total number of moles of H2SO4 needed to prepare 5.0 liters of a 2.0 M solution of H2SO4?

10 Moles

What is the mass of NH4CL that must be dissolved in 200 grams of water 50 degree celsius to make a saturated solution?

104 g You must double the solute

How many grams of NaNO3 would have to be added to 100. grams of water at 45°C to make a saturated solution of?

110

One hundred grams of water is saturated with NH4Cl at 50°C. According to Table G, if the temperature is lowered to 10°C, what is the total amount of NH4Cl that will precipitate?

17 g

The molar mass of Ba(OH)2

171.3 g

If 0.025 gram of Pb(NO3)2 is dissolved in 100 grams of H20 what is the concentration of the resulting solution?

250 ppm

A student wants to prepare a 1.0-liter solution. What is the proper procedure to follow? A student wants to prepare a 1.0-liter solution of a specific molarity. The student determines that the mass of the solute needs to be 30. grams. What is the proper procedure to follow? 1. Add 30. g of solute to 1.0 L of solvent. 2. Add 30. g of solute to 970. mL of solvent to make 1.0 L of solution. 3. Add 1000. g of solvent to 30. g of solute. 4. Add enough solvent to 30. g of solute to make 1.0 L of solution

4. Add enough solvent to 30. g of solute to make 1.0 L of solution

What is the total number of moles of NaCl(s) needed to make 3.0 liters of 2.0 M NaCl solution?

6.0

The solubility of KClO3 in water increases as the

Temperature of the solution Increases

The solubility of KCl(s) in water depends on the:

Temperature of the water

What is the concentration of 0(2)g , in parts per million, in a solution that contains 0.008 gram of 0(2) g dissolved in 1000. grams of H(2)0(l)?

8ppm

Ionic solids will most likely dissolve in:

H2O which is a polar solvent

Under which conditions are gases most soluble in water?

High pressure and Low temperature

Compared to a 0.1 M aqueous solution of NaCl, a 0.8 M aqueous solution of NaCl has a? 1) higher boiling point and a higher freezing point 2) higher boiling point and a lower freezing point 3) lower boiling point and a higher freezing point 4) lower boiling point and a lower freezing point

Higher boiling point and a Lower freezing point

Compared to the boiling point and the freezing point of water at 1.0 atmosphere, a 1.0 M CaCl(2) aqueous solution at 1 atmosphere has a:

Higher boiling point and a Lower freezing point

When 5 grams of KCl are dissolved in 50. grams of water at 25*C, the resulting mixture can be described as :

Homogeneous and Unsaturated

Based on reference table f which solution will contain the highest concentration of iodide ions:

Iron(ll) Iodide

Compared to the freezing point and boiling point of water at 1 atmosphere, a solution of a salt and water at 1 atmosphere has a:

Lower freezing point and a Higher boiling point

Which compound is soluble in water?

Na(2)S

Based on Reference Table F,which of these salts is the strongest electrolyte?

Na2SO4

The gram- formula mass of NO(2) is defined as the mass of:

One mole of NO(2)

According to Reference Table F, which of the compounds is the least soluble in water?

Phosphates form insoluble compounds unless they are combined with Group 1 ions or the ammonium ion>

Which salt is most soluble at 60°C?

Reduce all of the ratios to lowest whole number ratios and then compare .

Which barium salt is insoluble in water?

Reference Table F states that carbonates form insoluble compounds.

According to Reference Table G, a temperature change from 60*C to 90*C has the least effect on the solubility of:

SO2

A solution containing 60 grams of NaNO3 completely dissolved in 50. grams of water at 50*C is classified as being:

Supersaturated

A sample is prepared by adding 10 grams of oxygen gas to 10 grams of nitrogen gas which of the following is it? 1.a mixture that is 50.% oxygen by mass 2.a compound that is 50.% oxygen by mass 3.a mixture in which 50.% of the atoms are oxygen 4.a compound in which 50.% of the atoms are oxygen

The fact that no change in energy is observed implies that no chemical reaction has taken place.So, the result is a physical mixture with 10. grams of each diatomic gas. A mixture that is 50 percent oxygen by mass

Based on Reference Table F,which of these salts is the best electrolyte?

The most soluble salt will be the best electrolyte. Reference Table F indicates that all nitrates are soluble. The other three compounds are insoluble.

Which statement is true for a saturated solution?

The rate of dissolving equals the rate of crystallizing.

What is the total number of grams of a Nal(s) needed to make 1.0 liter of a 0.010 M solution?

rmm NAI = 23+127 =150 moles x rmm = mass 0.01 x 150 = 1.5g