Answers SS - TX - Chemistry BWriting and Balancing Chemical Equations

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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?Use .

0.113 M

0.151 M

6.62 M

11.3 M

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Which statement accurately describes part of the dissolving process of a polar solute in water?

Solute molecules repel water molecules.

Water molecules surround solute molecules.

Water molecules are strongly attracted to nonpolar substances.

Solute molecules remain concentrated in one part of the solvent.

The graph below shows how solubility changes with temperature.How many grams of NaCl will be needed to form 600 mL of a saturated solution at 100°C?

15 g

24 g

40 g

240 g

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?Use .

125 mL

250 mL

500 mL

2,000 mL

Which statement best describes the process of making a solution by diluting a stock solution?

Add more solute to decrease the concentration.

Add more solute to increase the concentration.

Add more solvent to decrease the concentration.

Add more solvent to increase the concentration.

Which is an example of a nonaqueous solution?

gasoline

fog

mayonnaise

fruit juice

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 NaCl + H2OWhat was the original concentration of the HCl solution?

0.040 M

0.25 M

1.50 M

2.50 M

Which describes the polarity in a water molecule?

partial negative charge on the oxygen atom because its electrons are pulled toward the hydrogen atoms

partial negative charge on the oxygen atom because it pulls electrons from the hydrogen atoms

partial positive charge on the oxygen atom because it pulls electrons from the hydrogen atoms

partial positive charge on the oxygen atom because its electrons are pulled toward the hydrogen atoms

Which is most likely true about water in chemical systems?

Water dissolves nonpolar ionic compounds.

Water dissociates ionic compounds.

Water dissociates covalent molecules.

Water dissolves nonpolar covalent substances.

Which best explains why water has a much higher boiling point than would otherwise be predicted?

Water forms weak hydrogen bonds.

Water forms strong hydrogen bonds.

Water has weak cohesive forces.

Water has strong adhesive forces.

Water is called the “universal solvent.” Which statement best explains this description with respect to ionic compounds?

Water can dissociate all ionic compounds through ion-dipole interactions.

Water can hydrate many ionic compounds through hydrogen-bonding interactions.

Water can dissociate many ionic compounds through ion-dipole interactions.

Water can hydrate many ionic compounds through dipole-dipole interactions.

Which of these factors will cause a solid solute to dissolve faster?

increasing the air temperature

increasing the amount of solute

increasing the amount of solvent

increasing the surface area of solute

A can of soda contains many ingredients, including vanilla, caffeine, sugar, and water. Which ingredient is the solvent?

caffeine

sugar

vanilla

water

Brownian motion is not observed in a mixture that includes two phases. Which best identifies the mixture?

a colloid

a suspension

a solution

an alloy

Which factor influences both solubility and the rate of dissolution?

pressure

temperature

particle size

nature of solvent

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