Mixtures and Solutions- Inv. 4/5

__________ - a solution in which the solvent cannot dissolve any more solute.

• saturated
• unsaturated

• dissolve

• soluble

Answer explanation

Saturated - a solution in which the solvent cannot dissolve any more solute.

__________ -capable of being dissolved

• soluble
• insoluble
• solute
• mixture

Answer explanation

Soluble means capable of being dissolved.

Rock candy is made with __________ and __________. The mixture is __________ in order to __________ as much sugar as possible.

• salt and sugar

  cooled to harden

• sugar and water

  heated to dissolve

• sugar and salt

  cooled to harden

• sugar and more sugar

  heated to dissolve

Tags

NGSS.MS-PS1-4

If a solution is saturated, no more solid will dissolve at the current temperature.

• True

• False

Answer explanation

If a solution is saturated, no more solid will dissolve at the current temperature. This statement is true.

The solubility of a solid in water is the same for all solids.

• True

• False

Answer explanation

The statement is false. The solubility of a solid in water varies for different solids.

Mass of a saturated solution = mass of water + mass of the dissolved solid.

• True

• False

Answer explanation

The statement is true. The mass of a saturated solution is the sum of the mass of water and the mass of the dissolved solid.

Tags

NGSS.MS-PS1-5

Choose the best answer. What is evidence that a chemical reaction has occurred?

• a precipitate formed

• gas is formed

• temperature has changed

• all of the above could be evidence

Answer explanation

The formation of a precipitate, the production of gas, and a change in temperature are all evidence that a chemical reaction has occurred. Therefore, the correct answer is 'all of the above could be evidence'.

Tags

NGSS.MS-PS1-2

Choose the best answer. A student mixes a colorless liquid with a pink solid. When all the solid dissolves, the solution turns pink. 10 minutes later, a solid settles on the bottom of the cup. What is the best evidence that a chemical reaction occurred?

• The solution turned pink.

• The solid dissolved.

• The solid formed on the bottom of the cup.

• You could still see through the liquid.

Answer explanation

The formation of a solid on the bottom of the cup is the best evidence of a chemical reaction.

Tags

NGSS.MS-PS1-2

A student made a solution with 4 spoons of Kool-Aid and water. Not all the Kool-Aid powder dissolved after stirring it. What can the student do to get all the powder to dissolve?

• add more powder

• add more water

• evaporate some of the water

• use filter paper

Answer explanation

To dissolve all the Kool-Aid powder, the student should add more water.

Concrete is a mixture of cement, rocks, sand, and water. When the mixture dries it is very hard. Which of the following describes concrete?

• the product is a chemical reaction

• the component is a mixture

• the solute of a solution

• the reactant in a chemical reaction

Answer explanation

Concrete is a mixture of cement, rocks, sand, and water. When the mixture dries, it becomes very hard. Therefore, concrete is described as a mixture.