Chemical Reactions

Logs were burned in a fireplace. What sign is present that a chemical reaction happened?

• A precipitate formed.

• The total mass decreased.

• The total mass increased.

• Heat was given off.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

What is the abbreviated way to show a chemical reaction?

• A chemical symbol

• A chemical formula

• A chemical equation

Which of the following is a reactant in the equation?

• Na

• NaCl

• 2

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a product in the equation?

• Na

• NaCl

• 2

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

If the products formed from the burning candle are mostly carbon (C), carbon dioxide (CO2), and water (H2O), what elements were in the reactants?

• carbon, oxygen, hydrogen

• carbon only

• hydrogen only

• carbon and oxygen

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which characteristics are chemical characteristics?

• flammability

• melting point

• reactivity

• boiling point

• ability to rust

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Matter can go through changes. What are these changes called?

• positive and negative changes

• dependent and independent changes

• acidic and basic changes

• physical and chemical changes

Tags

NGSS.MS-PS1-4

Which changes are chemical changes?

• Cutting paper

• Toasting Bread

• A Rotting Banana

• Fireworks Display

• Rusting

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Over time a banana on the counter turned brown. What sign is present that a chemical reaction happened?

• A precipitate formed.

• The color changed.

• The temperature changed.

• A gas was produced.

Tags

NGSS.MS-PS1-2

What are the two major parts of every chemical equation?

• coefficients and subscripts

• rations and proportions

• reactants and products

• mass and volume