Physical & Chemical change
What is a physical change?
A physical change is a change that does not produce any new chemical substances
A substance that increases the rate of reactions but isn't used up.
What is a catalyst?
A steep gradient on a rate of reaction graph indicates ........
A steep gradient on a rate of reaction graph indicates a fast rate of reaction.
The approximate percentages of the four most abundant gases in dry air.
What is 78% Nitrogen, 21% Oxygen, 1% Argon and 0.04% Carbon Dioxide? (Answers may vary by 1%)
Atoms that have the same number of protons but a different number of neutrons.
What are isotopes?
What is a chemical change?
A chemical change is a change where new chemical substances are formed
What four factors affect the rate of a chemical reaction?
The concentration
Surface area of solid reactants
The temperature
The presence of a catalyst
Which graph will have a steeper gradient? Concentrated acid and marble chips or dilute acid and marble chips?
The graph which will have the steeper gradient is concentrated acid and marble chips.
The product of combustion of hydrogen in air.
The electron configuration of oxygen (which has 16 electrons).
What is 2.8.6?
True or False? Physical changes are difficult to reverse.
False. Physical changes are often easy to reverse
What has a greater surface area, magnesium ribbon or magnesium powder?
Magnesium powder has a greater surface area
Which lines on the graph indicate a reaction that has taken place between acid and
powdered calcium carbonate?
lumps of calcium carbonate?
The lines on the graph that indicate a reaction that has taken place between acid and
powdered calcium carbonate: A
lumps of calcium carbonate: B
A metal which burns brightly when combusting in air.
What is magnesium?
These gases are located to the right of the periodic table and are unreactive.
What are noble gases?
What indicates a chemical change has occurred?
Signs of a chemical change include colour changes, temperature changes, and effervescence (fizzing).
Will increasing or decreasing the temperature increase the rate of reaction?
Increasing the temperature will increase the rate of reaction.
The physical test and chemical used to find pure water.
What is boiling point at 100ºC and anhydrous copper sulphate?
The five most reactive elements in the reactivity series.
What is potassium, sodium, lithium, calcium and magnesium?
The charge of carbonate.
What is 2-?
True or False? Dissolving a solute in a solvent is a chemical change.
False. Dissolving a solute in a solvent is a physical change.
True or False?
Adding a catalyst to a reaction will decrease the rate.
False. Adding a catalyst to a reaction will increase the rate.
The chemical used to test for Cu, Fe(II), and Fe(III) and the colour precipitates of each.
What is sodium hydroxide and Cu is blue, Fe(II) is green, Fe(III) is orange-brown?
Three ways to prevent iron from rusting.
What is galvanising, barrier methods and sacrificial protection?
In ionic bonding, it is the force between the two oppositely charged ions.
What is the electrostatic force of attraction?