Properties and Changes

Which is a chemical property?

• compression

• ductility

• melting

• reactivity

Which observation is a sign of a chemical change? 2 answers

• bubbles escaping from the combination of baking soda and vinegar

• iron filings sticking to a magnet

• lights flashing from fireworks

• water turning to ice in a freezer

If an ice pack vial was popped and it started getting icy cold, what kind of reaction occurred in the ice pack?

• It is a physical change as evidenced by a drop in temperature.

• It is a chemical change because two different chemicals are mixed together.

• It is a chemical change because heat energy is absorbed and the pack gets colder.

• It is a physical change because the substance in the vial dissolved in the pack's liquid.

What type of reaction are fireworks?

• It is a change of state, solid to gas, due to the addition of energy.

• It was a physical reaction since the fuse was lit and heat was produced.

• The color changes and the release of energy indicate a chemical reaction.

• It is an endothermic reaction because energy was added; therefore it is a chemical reaction.

Which of the following is not a physical property of matter?

• ductility

• color

• thermal conductivity

• reactivity to water

Which of the following represents ONLY physical properties?

• flammable, density, malleable

• malleable, reactive, density

• powdery, density, red

• clear, grainy, nonflammable

If you make a physical change to a substance, the identity of the substance changes.

• True

• False

Chemical changes are reversible.

• True

• False

Which is an example of a chemical change?

• the odor of sour milk

• dissolving sugar into water

• a button sinking in a cup of water

• ice melting

The amount of matter in an object is its

• mass.

• inertia.

• weight.

• volume.