Chemical vs. Physical Changes

Which of the following is evidence that a chemical change has occurred?

• The reactants separate

• A strong odor

• A new substance is formed.

• None of the above.

Tags

NGSS.MS-PS1-2

Both physical and chemical changes affect matter, but physical changes are _____________ and chemical changes are _______________.

• reversible, irreversible

• permanent, reversible

• irreversible, reversible

• irreversible, permanent

An ice cube melts in a glass of water. Has a chemical reaction taken place? How do you know?

• Yes, a new substance was formed.

• Yes, a gas was given off.

• No, the color did not change.

• No, a phase change does always not indicate a chemical

Tags

NGSS.MS-PS1-2

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

• Rust forming on your bike.

• A popsicle melting in the sun.

• Rolling a ball of dough into a flat pizza.

• Boiling a pot of water.

Tags

NGSS.MS-PS1-2

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

• Rust forming on your bike.

• Sugar turning into caramel.

• Rolling a ball of dough into a flat pizza.

• Plants changing sunlight, water, and carbon dioxide into

  glucose and oxygen.

Which component represents a reactant in the diagram above?

• Carbon dioxide gas

• Water

• Baking soda

• Oxygen

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which component represents a product in the diagram above?

• Carbon dioxide gas

• Vinegar

• Baking soda

• air

Tags

NGSS.MS-PS1-2

Baking soda and vinegar chemically change. What evidence supports a chemical change?

• The baking soda dissolves

• A gas is produced

• A mixture is formed

• airColor change

Tags

NGSS.MS-PS1-2

The process in which substances known as reactants, are converted into new substances known as products.

• Chemical Reaction

• Chemical Change

• Reactants

• Products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The substances that are combined during a chemical reaction

• Chemical Reaction

• Chemical Change

• Reactants

• Products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5