Ch. 8 Describing Chemical Reactions

Hydrogen gas and oxygen gas combine to form

• hydrate

• hydroxide

• oxyhydride

• water

silver oxide decomposes into...

• silver + oxide

• silver + oxygen + hydrogen

• silver + hydroxide

• silver + oxygen

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

If an element is diatomic it should have a subscript of___

• 2, always

• 2, only when it is by itself

• it shouldn't have a subscript, it should have a coefficent

Tags

NGSS.MS-PS1-1

When a CHEMICAL reaction occurs, what is made?

• No new substance is made.

• A new substance is made with new atoms formed

• A new substance is made, with existing atoms rearranged

• All substances remain the same, but physical state may change.

Tags

NGSS.HS-PS1-7

What does this word equation represent: Iron + oxygen → Iron oxide

• A physical change in iron (nothing new gets made)

• A chemical reactino between iron and oxygen, where rust (iron oxide) is produced

• A chemical reaction between iron and rust, where oxygen is produced

• A physical change between iron and oxygen that forms a red color

In a chemical reaction...

• atoms aren't rearranged

• atoms are rearranged

Tags

NGSS.HS-PS1-7

physical changes and chemical reactions are the same

• false

• true

a catalyst...

• doesn affect a chemical reaction

• slows down a chemical reaction

• speeds up a chemical reaction

signs of a chemical reaction...

• bubbles and change of colour

• its impossible to know if a chemical reaction occurs

Tags

NGSS.MS-PS1-2

what you need for chemical reaction are called...

• reactants

• products