Pre-Assessment - Matter

All matter has physical and chemical properties. These properties can be used to identify the type of matter. Which of these statements describes a chemical property?

• A particular substance evaporates at 30 °C.

• A 2-ft.-long metal bar has a mass of only 176 g.

• A certain heavy metal turns to a liquid at room temperature.

• A metal is added to a beaker of water, and the beaker explodes.

David found that water can be created in a lab by burning hydrogen gas in air. He concluded that water is not a compound because only hydrogen was used to form water. What is wrong with David’s conclusion?

• A compound does contain only one type of element.

• Hydrogen is made up of two different types of atoms.

• Water was not the product formed when he burned hydrogen.

• The hydrogen combined with oxygen from the air to form water.

Which process represents a chemical change?

• A lake freezes over into ice.

• A metal bar is rolled into a flat sheet.

• Vinegar bubbles when baking soda is added.

• Sand, water, and salt combine to form a mixture.

The diagram shows how the temperature of water changes as the water changes states.

Between which points does water boil?

• 1 to 2

• 2 to 3

• 3 to 4

• 4 to 5

Trini adds 10 g of baking soda to 100 g of vinegar. The mixture begins to bubble. When the bubbling stops, Trini finds the mass of the resulting mixture. She determines its mass is 105 g. Why has the mass changed?

• A gas has formed and left the mixture.

• Vinegar evaporated during the experiment.

• Mixtures always are less massive than their parts.

• Mass was destroyed when vinegar reacted with baking soda.

Marissa blows up balloons for a party. She decides how big or small to make each balloon. Why does the air she blows into each balloon take up all the space inside the balloon?

• The air particles are easily able to slide past one another.

• Air is a gas and so fills its container, the balloon, completely.

• The air particles increase in size when they have more space.

• There is a strong attraction between the air particles and the balloon.

Some properties are the same in a substance no matter the amount of the substance. Which of the following properties does not change based on the amount of the substance?

• density

• mass

• volume

• weight

At which temperature does ice melt into liquid water?

• 0°C

• 32°C

• 100°C

• 212°C

The four picture items were part of a dinner. Each item is a mixture.

Which of these mixtures is a suspension?

• A

• B

• C

• D

The illustration shows a rectangular solid.

What is the volume of this solid?

• 21 cm³

• 30 cm²

• 60 cm²

• 300 cm³