unit test study guide
A 150 mL sample of hydrochloric acid (HCl) completely reacted with 60.0 mL of a 0.100 M NaOH solution. The equation for the reaction is given below. HCl + NaOH (yields) NaCl + H2O What was the original concentration of the HCl solution?
0.040 M
The molar mass of KCl is 74.55 g/mol. If 8.45 g KCl are dissolved in 0.750 L of solution, what is the molarity of the solution?
0.151 M
How many moles of Ba(NO3)2 are there in 0.25 L of a 2.00 M Ba(NO3)2 solution?
0.50 mol
In a group assignment, students are required to fill 10 beakers with 0.720 M CaCl2. If the molar mass of CaCl2 is 110.98 g/mol and each beaker must have 250. mL of solution, what mass of CaCl2 would be used?
200g
How many grams of NaCl will be needed to form 600 mL of a saturated solution at 100°C?
240
A chemist dilutes a 1.0 mL sample of 2.0 M KNO3 by adding water to it. If the concentration of the solution that is obtained is 0.0080 M, what is its volume?
250 mL
A student takes a measured volume of 3.00 M HCl to prepare a 50.0 mL sample of 1.80 M HCl. What volume of 3.00 M HCl did the student use to make the sample?
30.0 mL
In a school's laboratory, students require 50.0 mL of 2.50 M H2SO4 for an experiment, but the only available stock solution of the acid has a concentration of 18.0 M. What volume of the stock solution would they use to make the required solution?
6.94 mL
Which statement best describes the formation of a solution?
A small amount of solute is dissolved in a larger amount of solvent.
Which statement best describes a true solution?
A true solution will not separate in a centrifuge.
Which statement best describes the process of making a solution by diluting a stock solution?
Add more solvent to decrease the concentration.
Which is a characteristic of a solution?
Its particles are evenly distributed.
Given that the molar mass of NaNO3 is 85.00 g/mol, what mass of NaNO3 is needed to make 4.50 L of a 1.50 M NaNO3 solution?
NOT 6.75 g
A chemistry teacher adds 50.0 mL of 1.50 M H2SO4 solution to 200 mL of water. What is the concentration of the final solution?
NOT 7.50 M
Which is true about the dissolving process in water?
NOT Nonpolar solutes dissolve easily in water.
Which is a way to express concentration of a solution?
NOT molar mass
Mixture A was made by mixing different components together, but it appears to have one phase. Which term best categorizes mixture A?
NOT suspension
Which statement accurately describes part of the dissolving process of a polar solute in water?
Water molecules surround solute molecules.
Which would be the best way to represent the concentration of a 1.75 M K2CrO4 solution?
[K2CrO4]
A solid is stirred into a liquid and dissolves. Which type of mixture forms?
a solution
Brownian motion is not observed in a mixture that includes two phases. Which best identifies the mixture?
a suspension
Alcohol is poured into a beaker that contains 2% saltwater. Which are the solutes in the new solution?
alcohol and salt
Milk is a heterogeneous mixture that contains different types of particles in different phases. Due to the sizes of the particles in milk and the way they are dispersed, the particles do not easily settle out. They also cannot easily be filtered out. Therefore, milk is best described as a
colloid
Which is an example of a nonaqueous solution?
gasoline
Which refers to a mixture that contains more than one phase in which the characteristics of the particles vary throughout the mixture?
heterogeneous
Which of these factors will cause a solid solute to dissolve faster?
increasing the surface area of solute
A solution contains 90 mL of methanol, 18 mL of propanol, and 2 mL of diethyl ether. Which is the solvent in this solution?
methanol
Which best defines concentration?
ratio that describes the amount of solute divided by the amount of solvent or solution
Josh prepares a solution by mixing sodium nitrate and water. To calculate the molarity of the solution, Josh should calculate the moles of which substance, and why?
sodium nitrate, because it is the solute
A nonaqueous solution has a solvent that is not water. Which is an example of a nonaqueous solution?
steel
Which factor influences both solubility and the rate of dissolution?
temperature
A can of soda contains many ingredients, including vanilla, caffeine, sugar, and water. Which ingredient is the solvent?
water
In which situation can a mixture always be called a solution?
when the mixture is homogeneous