Changes in Matter – (REG IAT) Reading & Questions

Dissolving a packet of juice powder in water makes a new substance.

• No. Dissolving is a physical change because the powder spreads out in water and can be recovered by removing the water.

• Yes. A completely new substance forms that cannot be separated.

• No. It is not any kind of change at all.

• Yes. Dissolving always causes a chemical reaction that creates gas.

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Which processes are physical changes? Select all that apply.

• Drying wet clothes

• Lighting a match from a matchbook

• Cutting snowflakes out of paper

• Melting butter for popcorn

Which changes that occur in nature are physical changes? Select all that apply.

• Snow melting in spring

• Leaves burning in a campfire

• Water evaporating from a puddle

• Iron rusting on a fence

• A lake freezing in winter

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Shattered glass from a window is scattered across the floor. Which chemical treatment would best help collect prints from the glass pieces?

• Use super glue fuming so fingerprints become visible on the glass.

• Spread plant fertilizer on the glass to react with oils.

• Add food coloring to see prints better.

• Rinse the glass with water to clean it.

Figure 4. Observe The copper in the Statue of Liberty is exposed to oxygen in the air. What chemical change did the Statue of Liberty likely undergo?

• Combustion

• Electrolysis

• Oxidation

• Tarnishing

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A chemical reaction is another name for a chemical _________?

• Combustion

• Change

• Property

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(Assess Your Understanding Predict) What kind of chemical change most likely occurs when a banana peel turns brown in open air?

• Combustion

• Electrolysis

• Oxidation

• Melting

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When a substance undergoes a chemical change, what happens?

• It forms new substances with different properties

• It only changes state with the same substance

• Its mass is destroyed and disappears

• Its temperature must always increase

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Figure 6. (Thermal Energy Apply Concepts) Between a person and icy water, which direction will thermal energy flow?

• From the person to the icy water

• From the icy water to the person

• Equally in both directions at the same time

• Thermal energy will not flow

Figure 6. Thermal Energy Apply Concepts Between a person and a warm mud pit, which direction will thermal energy flow?

• From the person to the warm mud

• From the warm mud to the person

• Equally in both directions at the same time

• Thermal energy will not flow

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