5th Grade Science STAAR Unit 1 Review

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 water. The picture below 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.

When a powdered drink mix was added to water, the liquid turned orange. A student decided the taste was too strong, so he poured out half of the liquid and added more water. Which of the following most likely occurred when more water was added?

• The physical state changed.

• The orange color became lighter.

• The liquid had a sweeter taste.

• None of the above

A cook uses the ingredients listed below to prepare a meal.

Which table correctly shows the physical properties of these ingredients when placed in hot water?

• 
• 
• 
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A student made a mixture using equal amounts of salt and pepper. The salt grains were the same size as the pepper grains. What should the student do to most easily separate the pepper from the salt?

• Use a pair of tweezers to remove each grain of pepper

• Run a small magnet through the mixture to attract the pepper

• Put the mixture in water and filter the pepper out of the water

• Use a strainer with a fine wire screen to remove the pepper

A teacher gives a student four clear sealed containers. Each container holds a different substance. The student records some observations about the substance in each container. Based on these observations, which container most likely holds only gas?

• Container 1

• Container 2

• Container 3

• Container 4

Some students investigate the properties of four objects using a hand lens, a magnet, and a beaker containing water. Their observations are recorded in the table. Which statement identifies a property that could be used to classify these objects into two different groups?

• Density can be used to separate objects that sink in water from objects that do not.

• Magnetism can be used to separate objects that are attracted by a magnet from objects that are not.

• Solubility can be used to separate objects that dissolve in water from objects that do not.

• Physical state can be used to separate objects that are solids from objects that are not.

A student adds 10 grams of four different powdered solids into four different beakers. The student then adds 100 mL of water to each beaker, stirs the mixtures, and allows them to sit for half an hour before recording observations. Which question is the student most likely trying to answer with this investigation?

• At what water temperature do the substances dissolve?

• How much water is needed to cause a substance to change state?

• What causes a substance to sink when put in water?

• Which substances dissolve in water?

A student classifies the objects shown based on their physical properties. Which property cannot be used to classify these objects into more than one group?

• Magnetism

• Mass

• Electrical conductivity

• Solubility in water

A science class tested three properties of different materials. The results are shown in the table below. Based on the table, which material would be best to use to insulate electrical wires?

• Wood

• Plastic

• Copper

• Steel

Some people add sugar to their hot tea. Which property of the sugar remains the same when the sugar is in the tea solution?

• The taste of the sugar

• The size of the sugar crystals

• The color of the sugar

• The texture of the sugar