Examples Of Chemical Reactions Flashcards
What do all. Reactions involve
A change in energy
In exo and endothermic reactionns reactions how is energy usually transferred
By heating
What happens in exothermic reactions
The reaction transfers energy to its surroundings
How are exothermic reactions shown
They are shown by a rise of temperature as energy is transferred to the surroundings
What do exothermic reactions include
Combustion
What are the uses of exothermic reactions
Hand warmers
What happens in endothermic reactions
It takes in energy from the surroundings
How are endothermic reactions shown
By a decrease in surrounding temprature
What do endothermic reactions include
Thermal decomposition
What are the uses of endothermic reactions
Some sport injury packs or ice packs
What is oxidation
When a substance gains oxygen
What do oxidation reactions include…
Combustion
Rusting of iron
What is the world equation for rusting of iron
Iron + oxygen —>iron oxide (rust)
What is thermal decomposition
When a substance breaks down into at least two other substances when heated
True or False
In thermal decomposition, even if the substance doesn’t react with anything it is still a chemical change
TRUE
What do some metal carbonates break down to form when heated
Metal oxide and carbo dioxide
What does copper carbonate break down into when heated.
Copper —>. Copper oxide. + carbon dioxide
Carbonate
What is combustion (burning)
When a fuel reacts with oxygen and releases carbon dioxide
How is energy transfered in combustion
Byheating and light
What does combustion need
Fuel
Heat
Oxygen
Because hydrocarbons are compounds what do they contain
Hydrogen and carbon atoms
Whatis often used as fuels in combustion
Hydrocarbons
What is the word equations for hydrocarbons when usedas fuels
Hydrocarbon + oxygen —> carbon dioxide + water
