Changes in Matter

Looking at the diagram which Test Tube is the Chemical Change?

• Test Tube A

• Test Tube B

Why are these changes classified as chemical changes?

• New substances formed

• Materials take different shapes

• Temperatures affect the objects

• Some energy is absorbed

A noble gas is a..

• elment

• compound

• mixture

Salt dissolved in water is....

• element

• compound

• mixture

hydrogen chemically combined with oxygen is...

• element

• compound

• mixture

Carbon dioxide is an example of

• a mixture

• an element

• a solution

• a compound

Which statement best describes the change to an ice cube as it melts?

• The change is physical because the mass remains the same.

• The change is physical because the substance remains the same.

• The change is chemical because water has a different pH than ice.

• The change is chemical because water has a lower density than water.

What should they make the statue out of to resist chemical weathering?

• concrete

• limestone

• marble

Surface tension is the property of the surface of a liquid that allows it to resist external forces by sticking together. This property is due to the ______ nature of water molecules.

• cohesive

• adhesive

Which of the following show an exothermic reaction?

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• 
• 
•