Chemical and Physical Changes

Front

A different chemical substance is formed when...

• a cloth is cut
• a cup breaks
• a candle burns
• a piece of chalk falls apart

Back

a candle burns

Front

When water in an open pan is heated for a long time, it becomes

Back

a gas

Front

Which object is most likely to rust? Options: an iron nail, a plastic comb, a glass marble, a paper cup

Back

an iron nail

Front

Which of the following is an example of MELTING? Options: stirring some sugar in water until you cannot see the sugar, heating a pan of water until the water is all gone, heating a block of ice until the ice turns to water, cooling water in the freezer until the water becomes solid

Back

heating a block of ice until the ice turns to water

Front

What does the release of gas bubbles indicate when baking soda is added to vinegar?

Back

a chemical reaction took place.

Front

When is iron most likely to rust? Options: damp, dry, painted, covered with grease

Back

damp

Front

An example of a liquid turning into a gas is

Back

steam escaping from a cup of hot chocolate

Front

Which mineral contains calcite? Options: limestone, sandstone, granite, gneiss

Back

limestone

Front

If you dissolved a lot of salt in some water in a large flat dish and put the dish in bright sunlight on a hot day, what would be left in the dish after a long time?

Back

dry salt

Front

What change has the candle wax undergone when it melts and hardens again?

Back

a physical change