Physical and Chemical Changes

Front

What type of change can be easily reversed?

Back

physical change

Front

Which of the following is an example of a physical change?

• a bike rusting
• toast burning
• butter melting
• food spoiling

Back

butter melting

Front

Which of the following examples is a physical change but NOT a change of state of matter?

logs burning

,

water freezing into ice cubes

,

candle wax melting

,

paper being cut

Back

paper being cut

Front

Which of the following is an example of a chemical change?

• a penny tarnishing
• a mirror being scratched
• hair being cut
• water being boiled

Back

a penny tarnishing

Front

What is the best way to separate a mixture of sugar, sand, and water?

Back

Filter the sand from the sugar and water, then heat the mixture, causing the water to evaporate.

Front

What conclusion can a student make about investigations with common classroom materials?

Back

The paperclip shows evidence of a physical change by changing the shape of the object, whereas the pencil eraser and hole puncher show evidence of a physical change by changing the size of the object.

Front

A 5th grade student places baking soda in a cup. The student then adds vinegar to the cup. The student collects the data below from the experiment. Based upon the results of the experiment, which statement BEST describes whether the change is a physical or chemical change.

• The data concludes that a physical change has occurred because it had an increased change in temperature, which resulted in the liquid to start bubbling.
• The data concludes that a physical change has occurred because the color of the liquid changed when you mixed two materials.
• The data concludes that a chemical change has occurred because there was formation of bubbles when the materials reacted to each other.
• The data concludes that a chemical change has occurred because mixing two substances together will always result in a reaction.

Back

The data concludes that a chemical change has occurred because there was formation of bubbles when the materials reacted to each other.

Front

Which of the following is a correct statement about the investigations?
Options:
1. All of the situations are examples of physical changes because all of the investigations exhibit changes to the physical properties.
2. None of the situations are examples of physical changes because they all involve a color change.
3. Situation 2 is a physical change because rust forming is a natural process.
4. Situations 1 and 3 are physical changes because no new substances are formed.

Back

Situations 1 and 3 are physical changes because no new substances are formed.

Front

Three students at Mountain Park Elementary were given an assignment by their science teacher to plan and carry out experiments where chemical changes would occur. The chart shows each student’s plan and the results he or she recorded. Which statement is true about the experiments?

Back

Student B was the only one to create an experiment with evidence of a chemical change. She created a new substance, a gas.

Front

Which argument BEST supports the student’s claim that changing the temperature of the water causes a physical change that turns water into ice?

Back

The ice cube is melting in the student’s hand since the hands are much warmer than the ice. Heat is being added to the ice, which causes the particles to move faster.