Physical and Chemical Changes

What type of change can be easily reversed?

• chemical change

• physical change

• both chemical and physical changes

• neither physical or chemical changes

Tags

NGSS.5-PS1-4

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

• a bike rusting

• toast burning

• butter melting

• food spoiling

Tags

NGSS.MS-PS1-4

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

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

• a penny tarnishing

• a mirror being scratched

• hair being cut

• water being boiled

Tags

NGSS.MS-PS1-2

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

• Freeze the mixture, causing the water to be destroyed, then sift the sugar from the sand.

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

• Filter the mixture, causing the sugar and sand to get caught but not the water.

• Stir the mixture, causing the water to move above the sugar and sand.

Tags

NGSS.5-PS1-4

A student is investigating changes with common classroom materials. Which of the following BEST describes the conclusion the student can make about the investigations?

• 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.

• All three investigations show evidence of a physical change due to a change in the color of the original substance.

• The paperclip and hole puncher shows evidence of a physical change by changing the chemical properties of the original object, whereas the pencil eraser shows evidence of a physical change by changing the size of the object.

• All three investigations show evidence of a physical change due to a change in state of matter.

Tags

NGSS.MS-PS1-2

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.

Tags

NGSS.MS-PS1-2

Which of the following is a correct statement about the investigations?

• All of the situations are examples of physical changes because all of the investigations exhibit changes to the physical properties.

• None of the situations are examples of physical changes because they all involve a color change.

• Situation 2 is a physical change because rust forming is a natural process.

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

Tags

NGSS.MS-PS1-2

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?

• Student A was the only one to create an experiment where a color change occurred. This shows evidence of a chemical change.

• Student A, Student B, and Student C all created experiments where chemical changes occurred. Student A observed a color change, Student B saw bubbles, and Student C was able to dissolve salt.

• Student B and Student C created experiments were chemical changes occurred. Student A just dyed her water. Student B and Student C both changed their substances to prove that they had chemical changes. Student B created a gas while Student C got rid of the salt.

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

Tags

NGSS.MS-PS1-2

A teacher takes a tray of ice cubes out of the freezer. Each student takes an ice cube and holds it in their hands. They make the observations listed in the chart. The student claims that changing the temperature of the water causes a physical change that turns water into ice.

Which argument BEST supports the student’s claim?

• 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.

• The ice cube is freezing in the student’s hand since the hands are much warmer than the ice. Heat is being removed from the ice, which causes the particles to move slower.

• The ice cube is melting in the student’s hand since state is changing from a solid to a liquid. Heat is being removed from the ice, which causes the particles to move faster.

• The ice cube is melting in the student’s hand since state is changing from a liquid to a solid. Heat is being added to the ice, which causes the particles to move slower.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5