Physical and Chemical Changes Review

Front

Which observation would indicate that a chemical reaction occurred? Options: The vinegar took the shape of the container in step 1, The steel wool sank into the vinegar in step 3, The temperature of the vinegar increased during step 4, The steel wool changed shape during step 6

Back

The temperature of the vinegar increased during step 4

Front

Which statement best describes evidence that a chemical reaction occurs as a cake bakes? Options: The water in the cake batter evaporates, The cake rises as gas bubbles form in the baking cake, The cake takes the shape of the container in which it is baked, The water in the cake batter is used to keep the cake moist as it bakes

Back

The cake rises as gas bubbles form in the baking cake

Front

Based on the observations of mixing 2 liquids in a beaker, which statement contains the best evidence that a chemical reaction occurred? Options: There is a change in shape, There is a change in volume, The two liquids mix into a solution, The two liquids form a new substance referred to as a precipitate

Back

The two liquids form a new substance referred to as a precipitate

Front

Which observation of the process of removing tarnish from a silver ring provides evidence of a chemical reaction?

Back

The liquid solution changed color

Front

What is the best evidence that a chemical reaction occurs when coal burns?

Back

A new substance is produced

Front

During an investigation, a student combined 2 clear colorless solutions. The temperature changed from 25°C to 23°C, and a white substance formed and settled to the bottom. What most likely happened?

Back

The solutions reacted chemically.

Front

Observation indicating a chemical reaction when baking soda is sprinkled on hydrochloric acid spill.

Back

The baking soda hydrochloric acid combined and bubbles formed

Front

In which investigation is it LEAST likely that the liquids reacted chemically? Options: Investigation 1, Investigation 2, Investigation 3, Investigation 4

Back

Investigation 3

Front

Based on their observations, can the students correctly conclude that a chemical reaction occurred?

Back

Yes, because a new material of a different color formed on part of the metal strip

Front

Based on the data provided in the graph, which statement best describes this chemical reaction? Options: This is an exothermic reaction due to the fact that the hot pack is absorbing thermal energy., This is an endothermic reaction due to the fact that the hot pack is absorbing thermal energy., This is an exothermic reaction because the hot pack is releasing thermal energy., This is an endothermic reaction because the hot pack is releasing thermal energy.

Back

This is an exothermic reaction because the hot pack is releasing thermal energy.