Physical and Chemical Changes Review

A student is investigating chemical changes by using different materials. Which investigation would provide evidence of a chemical change and why?

• Melting a solid with fire would provide evidence of a chemical change because the solid would change shape.

• Cutting cardboard into many smaller pieces would provide evidence of a chemical change because the pieces cannot be put back together.

• Placing a solid into hot water and stirring while the solid dissolves would provide evidence of a chemical change because the dissolved material is lost.

• Combining two liquids that give off heat and gas would provide evidence of a chemical change because the particles react to make a new material with different properties.

Tags

NGSS.MS-PS1-2

Which investigation would provide evidence of a chemical change?

• Spray perfume into the air, and when the air and perfume mix, observe the change in odor that happens as they mix.

• Put an antacid tablet in water, and when the antacid and water mix, observe the bubbles that form as a new substance is created.

• Heat water in a pan on a stove, and observe the steam that forms as the state of matter of the water changes.

• Blow air through a wand filled with soap solution, and observe the bubbles that form as the air becomes trapped.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which TWO investigations would provide evidence of a chemical change?

• Placing a liquid in a freezer until the liquid becomes a solid would provide evidence of a chemical change because the state of matter changes.

• Using a saw to cut a solid into two different pieces would provide evidence of a chemical change because the pieces cannot be put back together.

• Using a hot plate to heat a solid until it changes color and releases an odor would provide evidence of a chemical change because the particles cannot be changed back.

• D Placing two different liquids together in a beaker and observing that a solid forms when they mix would provide evidence of a chemical change because a new material is formed.

• Placing a mixture containing a solid and a liquid on a windowsill and letting the liquid evaporate would provide evidence of a chemical change because the evaporated material is lost.

Tags

NGSS.MS-PS1-2

A student is investigating with bananas in science class. The steps of her investigation are shown in the table. At which point in the student's investigation does a chemical change occur?

• A chemical change occurs in Step 1 when the bananas are separated because there is a change in mass.

• A chemical change occurs in Step 2 when the bananas are peeled because there is a change in texture.

• A chemical change occurs in Step 3 when the bananas are cut because there is a change in shape.

• A chemical change occurs in Step 4 when the bananas are left because there is a change in color.

Tags

NGSS.MS-PS1-2

Demetrius adds baking soda to liquid vinegar in a bottle and puts a balloon over the mouth of the bottle. As the baking soda disappears, bubbles are produced and the balloon inflates. The picture shows the result of Demetrius's experiment. What happened to the vinegar and baking soda?

• The vinegar separated from the baking soda, pushing up to fill the balloon.

• The vinegar mixed with the baking soda, expanding into a solid to fill the balloon.

• The vinegar and baking soda chemically changed, creating a gas that filled the balloon.

• The vinegar and baking soda physically changed, creating a liquid that filled the balloon.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A food scientist placed a raw egg in a pan and cooked it. The white and yolk became a thick, solid mass. What evidence indicates that a chemical reaction occurred when the egg was cooked?

• The cooked egg cannot return to its raw state.

• The egg changed from a liquid state to a solid state.

• Water vapor was released as the egg was heated.

• Some of the raw egg was boiled and released as gas.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Ms. Elroy demonstrates chemical changes by experimenting with science class. The diagram shows the experiment she performs. Select three events that are evidence of a chemical change.

• The powder changes to a liquid

• A gummy bear is added to the liquid

• A flame forms inside the test tube.

• Smoke is produced.

• The solution changes from clear to black.

Tags

NGSS.MS-PS1-2

A student wishes to demonstrate a chemical change using a jar filled with milk. Which action could the student take that would cause a chemical change in the milk?

• The student can heat the milk on the stove until it bubbles.

• The student can add vinegar to the milk to form chunks.

• The student can put the milk in the freezer until it is a solid.

• The student can separate the milk by pouring it into three jars.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Ethan is investigating chemical changes using four identical iron nails. He performs a different investigation on each of the nails. His methods and observations are shown in the table. The investigation of which nail will provide Ethan with evidence that a chemical change occurred.

• Nail 1 provides evidence of a chemical change because there is an increase in temperature.

• Nail 2 provides evidence of a chemical change because there is change in mass.

• Nail 3 provides evidence of a chemical change because there is a change in color.

• Nail 4 provides evidence of a chemical change because there is a change in shape.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Katrina is investigating chemical changes that result from applying heat to different objects. She performs four investigations to determine if a chemical change has occurred. The table shows her methods and observations. Which material provides Katrina evidence that a chemical change has occurred?

• The tin strip because it has a change in temperature

• The piece of paper because a new substance is formed

• The pot of water because the material disappears

• The solid candle wax because it has a change of state

Tags

NGSS.MS-PS1-2