LockeD! - 5.5C - Mixtures and Solutions #3

A worker built a sidewalk and pressed some large salt particles into the concrete while it was still wet. When the concrete was dry, the worker washed the sidewalk with the water. The picture shows the sidewalk after it was washed: What most likely happened to the salt?

• It evaporated into a gas

• It turned into concrete

• It dissolved in the water

• It turned into a solid

A student places a sugar cube in a beaker of water. What change will occur?

• The sugar cube will not change

• More water will be formed

• The sugar cube will become smaller

• The water will form crystals

This experiment shows how salt water can be boiled and made into freshwater. Which statement about solutions is supported by the diagram?

• The parts of a solution must have the same boiling point.

• A solution is made up of only one type of particle.

• A solution is formed when a liquid changes into a solid.

• The parts of a solution can be separated by a physical change.

River water is a solution because it —

• is a liquid, which has no definite shape

• contains dissolved minerals and salts

• carries sand, clay, and other sediment

• is a compound made up of two elements

In an activity, 20 grams of salt are dissolved in 70 grams of pure water. The water is then heated on a hot plate. When the water evaporates completely, how much salt will be left?

• 0 grams

• 18 grams

• 20 grams

• 22 grams

Tags

NGSS.5-PS1-2

Crystals were grown on a string in a clean glass jar containing sugar dissolved in hot water. The crystals grew on the string for several weeks. What kind of crystals are they?

• String

• Water

• Glass

• Sugar

A teaspoon of clean, dry sand is added to a cup of warm saltwater. What is most likely to happen after the mixture is stirred and then placed on a table for five minutes?

• The amount of water will increase.

• The salt will float to the top.

• The sand will settle to the bottom.

• The cup will heat up.

Which process will separate the sugar from mixture of sugar and water?

• Stirring the mixture

• Evaporating the water

• Adding more water

• Adding more sugar

Which of the following is the best evidence that sugar has dissolved in water?

• The sugar seems to disappear in the water

• The water temperature increases

• Some sugar turns into crystals

• Some bubbles form in the water

Which of the following can be separated using the equipment shown above?

• A mixture of salt and pepper

• A mixture of pepper and water

• A mixture of oxygen and water

• A mixture of raisins and nuts