Science revision KS3

What are chemical reactions

• When i put lego together

• When two elements chemically join and form a new substance

• Beats me

• When i say it is

Select the signs of a chemical reaction

• colour change

• gas given off

• temperature changes

• flames or sparks

• loud noise

What is the scientific name for burning

• combustion

• melting

• fire RUUUN AWAY

• nothing

In word equations, do you use an equals sign or arrow

• equals

• arrow

what does fuel need to burn

• carbon dioxide

• oxygen

• carbon monoxide

• methane

select the right equation for combustion

• fuel+oxygen (arrow) carbon dioxide+ water

• Carbon dioxide+fuel (arrow) water and hydrogen

True or false

fuels burn to transfer energy

• true

• false

In a word equation and reaction, what are the things we start with

• reactants

• ingridients

• little pinch of element

• product

In a word equation and reaction, what are the things we end with

• product

• reactant

• cake

What are decomposition reactions

• When compounds break down

• when you slice an element in half

• When a compound is burned