Year 10 Chemistry Flashcards
What is an energy level?
It is a shell
When a compound loses oxygen atoms what is it called?
Reduction
What is added to a name of a salt if it contains water?
Hydrate / Hydrated
What is a substance if it is described as anhydrous?
A substance that doesn’t have any water in it.
What is a reversible reaction?
A reversible reaction is one where the reactants from products which react together to give the reactants back. A and B can react to form C and D which can react to give A and B back.
What is an example of a reversible reaction?
Hydrated copper sulphate (which is coloured blue) which is heated to become anhydrous copper sulphate (coloured white) and water. These react again to become blue hydrated copper sulphate.
What is the first step of making water potable?
Filtration when solid particles in the water are filtered out
What is the second step of making potable?
Disinfection when bacteria and viruses are killed
What is fluoride and why do we need it?
Fluoride is a colourless mineral found in water and helps strengthen the enamel.
What is the formula for complete combustion for methane + oxygen
Methane + oxygen = carbon dioxide + water
What is the formula for incomplete combustion with methane?
Methane + oxygen = carbon monoxide + water
Why did Mendeleev leave gaps in his periodic table?
He left the spaces for atoms that he thought hadn’t been discovered yet. He knew this as there were some gaps left in places were atoms with different properties hadn’t been discovered yet.
How is Mendeleev’s periodic table different than the one we have now?
Mendeleev’s was arranged in order of atomic weight (protons + neutrons) but the one we have now is in order of atomic number (amount of protons)
What is a salt called if it doesn’t have any water in?
Anhydrous
What is the chemical formula of ammonia?
NH3
