Studied by 4 people
What is burning?
A chemical reaction in which a substance combines with oxygen.
Name some examples of fuels for burning
Charcoal, wood, coal, natural gas, and oil
What is another term for burning?
Combustion
What is an exothermic reaction?
A chemical reaction in which thermal energy is given out and increases the temperature of the surroundings
What are the 3 things needed for burning to take place?
Oxygen, heat, and fuel
Construct the chemical reaction that is used to form water.
Hydrogen + oxygen (arrow) water
Construct the exothermic reaction in which magnesium is burned
Magnesium + oxygen (arrow) magnesium oxide
What is an oxidation reaction?
A reaction in which a new substance combines with oxygen
Construct the equation for the exothermic reaction between potassium and water
Potassium + water (arrow) potassium hydroxide + hydrogen
Construct the equation for the exothermic reaction between magnesium and dilute hydrochloric acid
magnesium + hydrochloric acid (arrow) magnesium chloride + hydrogen
What is an endothermic reaction?
A chemical reaction in which thermal energy is absorbed from their surroundings and changed into chemical energy which is stored in the chemical bonds.
Constroct the endothermic word equation for the reaction between sodium hydrogencarbonate and citric acid
sodium hydrogencarbonate + citric acid (arrow) sodium citrate + water + carbon dioxide
Name an endothermic process
Ice melting
Name the chemical word equation for rust
iron + oxygen (arrow) iron oxide
What are the causes of iron rusting?
When the iron is exposed to water and oxygen
What are non reactive substances called?
inert
What is the word equation format for when any metal reacts with oxygen?
metal + oxygen (arrow) metal oxide
What is the word equation format for when any metal reacts with water?
metal + water (arrow) metal hydroxide + hydrogen
What is the word equation for when a metal reacts with acid?
metal + acid (arrow) salt + hydrogen
What is the test for hydrogen called?
The squeaky pop test. You get a burning splint and bring it close to the gas, if hydrogen is present then it burns witha squeaky pop.
What is the test for carbon dioxide called?
The limewater test. You get some limewater and pass it thorugh the gas, if the gas turns cloudy than carbon dioxide is present.
Name an exothermic reaction
Potassium + water (arrow) potassium hydroxide + hydrogen
Name an endothermic reaction
sodium hydrogencarbonate + citric acid (arrow) sodium citrate + water + carbon dioxide
what is an independent variable?
The variable that you change
What is the dependent variable?
The variable that you measure
What is the controlled variable?
The variable that stays the same
Note 
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