Changes in Matter

Select all the choices that are chemical changes.

• Burning wood

• crushing a can

• boiling water

• filtering out salt

• apple reacting with oxygen in the air after being cut

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the chemical properties of an element?

• It will remain the same no matter the element

• It is not related to reaction

• It is determined on how it behaves in a reaction

• it depends on the sample of element

Tags

NGSS.HS-PS1-1

The heat causes a chemical reaction between iron and sulfur which creates a compound with new chemical properties

• True

• False

Tags

NGSS.MS-PS1-2

Is there a mistake?

• Yes, a chemical change occurs when two liquids combine and a precipitate (solid) is formed

• No, a physical change occurs when two liquids combine and a precipitate (solid) is formed

Tags

NGSS.MS-PS1-2

When a chocolate bar melts, this is related to physical or chemical change?

What happens to the molecules?

• Physical change; molecules move slower

• Chemical change; molecules move faster

• Physical change; molecules move faster

• Chemical change; the molecules move slower

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

How can iron be a an example of a chemical property?

• Iron conducts electricity

• Iron can be flattened

• Iron can be drawn into a wire

• It can react with oxygen and form rust

Tags

NGSS.MS-PS1-2

Flammability is an example of an physical property.

• True

• False

During an experiment with chemical change, what happens after mixing baking soda and vinegar?

• Bubbles are formed

• It remains liquid

• It remains a solid

• All of the solid disappears

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The reason why a balloon filled with helium float in the air because ________.

• Helium is as dense as air

• Helium is denser than air

• Helium is less dense than air