CHEMICAL REACTIONS

In a chemical reaction...

• the atoms do not change at all.

• the resulting substance is completely different from the original ones.

• heat and light are always produced.

• No answer is correct.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The atoms in a chemcial reaction...

• never join together, as in physical reactions

• do the washing up at the weekend.

• join together in different ways.

• jump from window to window.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Is burning wood a chemical reaction?

• Yes, it is.

• Yes, they are.

• Yes, it does.

• Yes.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Two clues that indicate that a chemical reaction has taken place are...

• light, heat and sound energies.

• a change of colour and a change of state of matter.

• a change of colour and a change of name.

• gas formation and a change of colour.

Tags

NGSS.MS-PS1-2

Chemical reactions that produce heat are...

• heating reactions.

• arithmetic.

• exothermic.

• endomorphic.

Tags

NGSS.HS-PS1-4

When a chemical reaction absorbs heat we call it...

• endothermic.

• endohermic.

• endomorphic.

• endotrophic.

Tags

NGSS.HS-PS1-4

Combustion...

• is a rapid chemical combination of a substance with oxygen.

• it is a rapid quemical combination of a substance with oxigen.

• is a combination of oxygen and water.

• all are correct.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-5

Combustion produces energy in the form of...

• heat and litgh.

• hot and light.

• hit and light.

• light and heat.

Smoke and ash are residuals in...

• fermentation.

• oxygenation.

• combustion.

• distillation.

Which are the basic components of combustion?

• oxygen, heat and fuel.

• oxigen and fuel.

• heat, hot and hit.

• oxigen, feul and hit.