reactions

Created by

Sophia Hill

Cards (24)

What are the observations a chemical reaction
has taken place?
• Bubbles/fizzing (gas produced)
• Colour change or new solid formed
• Energy change
How do you describe an exothermic reaction?
A chemical reaction which releases
energy to the surroundings
What happens to the temperature
during an exothermic reaction?
The temperature increases
How do you describe an endothermic
reaction? 
A chemical reaction which absorbs
energy from the surroundings
What happens to the temperature
during an endothermic reaction?
The temperature decreases\
What does a catalyst do? 
Speeds up the rate
(speed) of reaction
Why can a catalyst be used
several times?
Catalysts are not used up during a reaction
Combustion is the scientific term for:
burning
in combustion Endo or exothermic
exothermic
What gas is required for fuels to undergo
combustion?
oxygen
Complete this complete combustion word
equation: ethanol - 
water + carbon dioxide
In exothermic reactions, is energy released or absorbed
released
In endothermic reactions, is energy released or absorbed
absorbed
When a compound is heated and it breaks down
into smaller compounds, it is referred to as
thermal decomposition
Complete this word equation: calcium = calcium oxide + 
carbon dioxide
calcium carbonate = calcium oxide + carbon dioxide.......................................... Is this reaction exothermic or endothermic?
endothermic
What is the chemical test for carbon dioxide?
bubble it through limewater and it turns cloudy
balance mg + 02 = mgO
2mg + 02 = 2mgO
balance C3H8 + O2 = CO2 + H2O 
C3H8 + 5 O2 = 3 CO2 + 4 H2O
What is meant by the term ‘conservation of
mass’?
Mass is not lost or gained during a reaction
What is the state symbol for solid  
(s)
What is the state symbol for gas 
(g)
What is the state symbol for gas 
(g)
what is the state symbol for dissolved in water
(aq)