Physical and Chemical Changes Review

When baking soda and vinegar are combined, bubbles form. How does this provided evidence that a chemical change has occurred?

• an unexpected color change occurred

• a gas is formed

• a solid is dissolved

• a precipitate is formed

Tags

NGSS.MS-PS1-2

Which example indicated a chemical change has occurred?

• paper changing color and releasing gas and smoke when burned

• rock particles separate from the soil when sifted

• boiling water bubbles when heated

• sugar is not visible when dissolved in water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When two liquids are mixed, which is NOT an indication that a chemical changes has occurred?

• a gas is produced and released in the form of bubbles

• on liquid dissolved into the other liquid

• the temperature changes

• a solid is formed

Tags

NGSS.MS-PS1-2

A student added a few drops of lemon juice to a test tube of vinegar and watched is fizz and bubble. What is the best conclusion?

• A chemical reaction produced a precipitate.

• No chemical change took place.

• Only a physical change occurred.

• A chemical change produced a gas.

Tags

NGSS.MS-PS1-2

During an investigation in science class, Mr. Clark places a small amount of a powder into a beaker and heats it over a hot plate. Which is the best indication that a chemical change has occurred?

• the substance is heated

• the substance did not change

• the substance melted

• the substance burned and turned black

Tags

NGSS.MS-PS1-2

Flour, sugar, eggs, and butter are mixed together and baked to make cookies. When the cookies are taken from the oven, they no longer look like the original ingredients.

Which of the following describes why the ingredients changed?

• a biological change occurred

• no change occurred

• a physical change occurred

• a chemical change occured

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which best describes a PHYSICAL change?

• Molecules combine to form a compound.

• A new element is created.

• The shape, size, or state of matter changes.

• Elements combine to form molecules.

Tags

NGSS.MS-PS1-4

Which best describes a CHEMICAL change?

• A new substance is created.

• The substance is smaller than it was before the change took place

• Two substances are combined to form a heterogeneous mixture.

• The substance looks the same as it did before the change took place.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Slicing strawberries is...

• a chemical change

• a physical change

Which of the following could ALL be the results of a physical change?

• Cooking food, mixing ingredients, freezing water
• Melting ice, boiling water, tearing paper
• Burning wood, rusting metal, evaporating water
• Breaking glass, cutting paper, dissolving sugar