PHS Exploring Science 7H Chemical Reactions

What is thermal decomposition?

• Breaking down compounds with force

• Breaking down compounds with heat

• Breaking down compounds with light

What is a compound?

• One type of atom

• Two more elements NOT chemically bonded

• Two or more elements chemically bonded

What is formed in all chemical reactions?

• New reactants

• New elements

• New substances

What is the test for carbon dioxide?

• Limewater turns cloudy

• Limewater turns black

• Limewater turns colorless

What is a element?

• One type of atom

• Two more elements NOT chemically bonded

• Two or more elements chemically bonded

What is always produced in thermal decomposition?

• metal + carbon dioxide

• metal oxide + carbon dioxide

• metal oxide + carbon

Calcium carbonate thermally decomposes into....

• calcium + carbon dioxide

• calcium oxide + carbon dioxide

• calcium oxide + oxygen

Why is copper used for wires?

• conducts electricity

• strong

• shiny

Iron + Sulphur --->

• iron sulphide

• iron sulphate

• iron sulphur

What side of the periodic table are metals found?

• Right

• Left