Answers SS - TX - Chemistry BWriting and Balancing Chemical Equations

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What type of mixture scatters light and cannot be filtered easily?

a colloid, a heterogeneous mixture

a solution, a heterogeneous mixture

a colloid, a homogeneous mixture

a solution, a homogeneous mixture

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In a coffee shop, the following coffee samples are prepared for customers.i. 10 g of sugar added to 100 g of coffeeii. 10 g of sugar added to 200 g of coffeeiii. 4 g of sugar added to 200 g of coffeeiv. 4 g of sugar added to 100 g of coffeeBased on the amount of sugar added, which sequence ranks the coffee from the sweetest coffee to the least-sweet coffee?

i, ii , iii, iv

iii, iv, ii, i

iv, i, ii, iii

i, ii, iv, iii

Which statements are true of heterogeneous mixtures? 1) They settle out. 2) The proportions of solute to solvent may vary. 3) The solute is evenly distributed throughout. 4) They are composed of two solvents and two solutes.

1 and 2

2 and 4

3 only

2 only

A number of beakers have different concentrations of a solution. Which statement best describes the most concentrated solution?

It has the largest volume.

It has the most solute for a given volume.

It has the greatest amount of solute.

It has the most volume for a given amount of solute.

The table below shows four samples of carbon dioxide gas and the temperature of the water that they were dissolved in.SampleTemperature of water (°C)1 782 733 554 63Which of the samples most likely had the lowest solubility?

What happens to water when it freezes?

Its mass increases.

Its mass decreases.

Its density increases.

Its density decreases.

Which factor causes a decrease in the rate of dissolution?

decreasing the amount of solute

increasing the stirring of the solution

decreasing the surface area of the solute

increasing the temperature of the solvent

Which describes a property of water that allows plants to transfer it from their roots to their leaves?

Water exhibits weak adhesion and cohesion, which allows capillary action to occur.

Water exhibits strong adhesion and cohesion, which allows capillary action to occur.

Water has low surface tension, which prevents capillary action from occurring.

Water has high surface tension, which prevents capillary action from occurring.

Which heterogeneous mixture contains large particles that can settle out or can be filtered?

colloid

compound

element

suspension

Which statement highlights a unique role of water in a biological system?

Organisms cannot use it to regulate their body temperature.

Few organisms can use it as a living environment.

It does not provide structural support to organisms.

It provides organisms a medium to transport materials.

The picture below shows a mixture that was stirred 3 minutes ago.What should this mixture be classified as?

colloid

compound

solution

suspension

What is the name of a solution whose concentration of solute is equal to the maximum concentration that is predicted from the solute's solubility?

dilute

saturated

unsaturated

supersaturated

Given that the molar mass of NaCl is 58.44 g/mol, what is the molarity of a solution that contains 87.75 g of NaCl in 500. mL of solution?Use .

0.333 M

0.751 M

1.50 M

3.00 M

Which contributes to the polarity of a water molecule?

a linear shape along with strong covalent bonds

deflection of hydrogen atoms by lone pairs of electrons

no difference in the electronegativity of oxygen and hydrogen

hydrogen bond formation between water molecules

Which is true about the dissolving process in water?

Polar solutes do not dissolve easily in water.

Water molecules are attracted by solute ions at the surface of the solute.

Water molecules move throughout the solute.

Solute molecules pull water molecules away from the surface.

A 1.00 L volume of HCl reacted completely with 2.00 L of 1.50 M Ca(OH)2 according to the balanced chemical equation below.2HCl + Ca(OH)2 CaCl2 + 2H2OWhat was the molarity of the HCl solution?

0.375 M

1.50 M

3.00 M

6.00 M

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?Use .

0.900 mL

1.11 mL

6.94 mL

7.20 mL

Which substance is an example of a colloid?

milk

tomato juice

sand and water

sugar and water

Which best explains why an iceberg floats?

Water expands and becomes denser when it freezes.

Water contracts and becomes denser when it freezes.

Water expands and becomes less dense when it freezes.

Water contracts and becomes less dense when it freezes.

Which of the following is a homogenous mixture?

blood

steel

cloud

muddy water

Which would be the best way to represent the concentration of a 1.75 M K2CrO4 solution?

1.75%

[K2CrO4] = 1.75 M

(K2CrO4)

K2CrO4, [M]

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 solvent

sodium nitrate, because it is the solute

water, because it is the solvent

water, because it is the solute

Which refers to a mixture that contains more than one phase in which the characteristics of the particles vary throughout the mixture?

compound

element

heterogeneous

homogeneous

Under which conditions would the solubility of a gas be greatest?

high pressure and high temperature

high pressure and low temperature

low pressure and high temperature

low pressure and low temperature

Which best explains why blood is considered to be a suspension?

It has nutrients that cannot be dissolved.

It contains particles that can settle out.

It has nutrients that are dissolved in its liquid portion.

It contains particles that mix on a molecular level.

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