Physicals and Chemical Changes

Which of these is a physical change that occurs because of a decrease in temperature?

• melting
• boiling
• condensation 
• evaporation

A  physical change is

• a change in physical properties of matter,   the matter change but what it is made of does not
• a new substance with different properties
• can be separated with a sifter
• stays the same

What are physical properties of a sugar cube?

• white,  soft, smooth, and made of sugar crystals
• yellow, round, and sweet
• white, cube, sweet, made of sugar crystals

A chemical change is a change in the chemical properties of matter. A chemical change occurs when two or more kinds of matter combine to form a new substance with different properties.

• True
• False

If you wanted a fruit to ripening quickly you would

• place it in the refrigerator because decreased temperatures would speed the chemical reaction up
• place it on the kitchen counter because increased temperatures would speed the chemical reaction up 

Which action describes a chemical change caused by a change in temperature?

• mixing nuts and seeds in a cold bow
• freezing water to make ice
• boiling an egg in a pot
• dissolving salt in warm water

What could you do to speed up evaporation?

• add ice
• use more water
• use two 
• add heat

Mrs. Spencer bought a cold water bottle to school and sat it on the desk. After a few minutes there were drops of water dripping down the side of the bottle. What caused the drops of water to appear on the bottle?

• The ice melted and dripped down the side of the bottle.
• The cold water warmed up causing excess water to drip down the side of the bottle.
• Water vapor from the air condensed on the cold bottle and dripped down the side.
• Water vapor was released from inside the bottle and dripped down the side of the bottle.

Which of the following is an example of condensation.

• fog on a car window
• rain
• boiling water
• snow

Evidence of chemical changes

• melting
• cutting
• bubbling