Chemical Reactions
Which of the following is an example of a chemical change: splitting wood, melting ice, burning wood or dissolving salt in water.
Burning Wood
In an acid + metal reaction what are the two products?
Salt and Hydrogen
A substance that enters a chemical reaction is called this.
Reactant
When a sodium chloride enters water, it ______
A reaction
What is a compound?
A compound is a substance made of two or more different elements chemically joined together
In a chemical reaction the substances to the right of the arrow are called what?
Products
Acid + Carbonate -> _____________
Salt + Water + Carbon Dioxide
How can we test for hydrogen?
Add a lit splint; it will make a squeaky pop sound
This indicator turns blue in an alkali and red in an acid. There are the other colour changes
Litmus
How can we test for carbon dioxide?
It will turn limewater from colourless to cloudy
Is a physical change reversible?
True
What salt would be produced from the below reaction
Potassium Carbonate + Ethanoic Acid
Potassium ethanoate
Power/Potential of Hydrogen
What is a colloid?
A mixture where small particles are spread out in another substance but don’t dissolve and don’t settle.
Complete this reaction: Zinc + Sulphuric Acid -> ____
Zinc sulphate + Hydrogen
The liquid a substance dissolves in is called a _____
Solvent
Which of these is not an element:
Diamond, graphite, hydrogen, water
Water
Complete this reaction:
Nitric acid + Copper oxide -> _______
Copper nitrate + water
What is the difference between a base and an alkali?
A base is any substance that can neutralise an acid, an alkali is a soluble base
If a substance dissolves into a liquid it will form a ____
Solution
Give three examples that a chemical change has taken place.
What is temp. change, color change, odor change, formation of a precipitate, formation of a gas?
What does this hazard symbol mean?
Oxidiser
State the law of conservation of mass
"matter can not be created or destroyed in a chemical reaction"
Name one of the indicators contained in Universal Indicator solution
Thymol Blue
Methyl Red
Bromothymol Blue
Phenolphthalein
Write the formula equation for the below:
Sodium + Hydrochloric acid -> Sodium Chloride + Hydrogen
Na + HCl -> NaCl + H2