Chemistry AQA practise questions Flashcards
What two substances have intermolecular forces between particles?
Water
Polythene
What two statements are properties o most transition metals?
They form ions with different charges
They have hight melting points
Explain how silver is less reactive than copper
Copper displaces silver and the grey crystals are silver and the copper ions that are produced are turning blue
How do you find the relative atomic mass?
adding the number of protons to the number of neutrons for the specific isotope of the element you’re considering.
E.G: For example, a carbon-12 atom has 6 protons and 6 neutrons, and so has a relative atomic mass of 12.
What is the law of conservation of mass?
reaction of mass that is neither created nor destroyed
How can you seperate an insoluble solution from the mixture at the end of a reaction?
by using the filtrate method
what is an impurity?
chemical substances inside a confined amount of liquid, gas or solid which differ from the chemical composition of the material or compound
Explain why reactions with high atom economy are used in industry
it uses fewer natural resources, produces less waste, and is better for the environment.
Name a substance in the solution that provides the hydroxide ions
Water
What is the difference between nuclear atom model and the plum pudding model
Nuclear-
positive charge only in the nucleus
Plum pudding-
Is a ball of positive charge
Electrons are very random
What change did Bohr make to the nuclear model?
for the electrons to orbit around the nucleus and that they are a specific distance from the nucleus
What is atomic number made up of?
Protons
What is meant by activation energy?
the minimum amount of energy needed to start a reastion
What is atomic weight?
The weight of atom of a element
What does oxidiation do?
Loses electrons
