Describing Chemical Reactions — Unit test Answers

The atoms in a sample are close together but can slide past one another. As the atoms lose energy, they move slower. The atoms become locked in place because of attractive forces between them.

Ella makes this table to organize her notes on whether atoms gain or lose energy during the changes of state.

Which type of bonding involves the complete transfer of a valence electron from a less electronegative atom to a more electronegative one?

Which best represents the reaction of calcium and zinc carbonate (ZnCO3) to form calcium carbonate (CaCO3) and zinc?

Which statement describes an extensive property of matter?

Which statement describes a chemical property of water?

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A cylinder at left with balls in a layer on the bottom of the cylinder has an arrow leading to a cylinder at right with balls stacked near the bottom of the cylinder.

Which is a process that involves collecting information and ideas that are supported by belief or opinion?

During which changes of state do atoms that cannot move past one another become free to move?

Rachel is making cookies. She pours 1/2 cup of oil into a bowl, followed by 1 cup of water. The oil rises to the surface of the bowl. Why?

Gerard lives in a tropical region where the average annual temperature is 77°F and the average annual rainfall is more than 100 inches a year. He surveys 25 people in his neighborhood about items they regularly use and records the data into a table.

Which represents an endothermic reaction?

Which sequence furthers scientific knowledge?