Chemistry Paper 1: Quantitive Chemistry Flashcards
What is the law of conservation of mass?
No atoms are lost or made during a chemical reaction so the mass of the products equals the mass of the reactants
How do we work out the mass of the products?
Add up the reactants
How are ionic compounds formed?
When metals react with non metals
What are ions?
Atoms with a charge
What do metals form?
Positive ions
What do most non metals form?
Negative ions
Finish the sentence: the charge of a metal ion is often…
the same as the group number
Finish the sentence: in an ionic compound the charges on the ions have to….
cancel each to leave an overall charge of zero
Why are you never allowed to change the small numbers in a chemical formula?
It produces a different molecule
What is relative formula mass?
The sun of the relative atomic masses of the atoms in the numbers shown in the formula
What is the equation for calculating percentage by mass?
Total relative atomic mass/relative formula mass x100
What is concentration?
Tells us the mass of a solute in a given volume of solution
What is a solute?
A chemical that is dissolved in a solvent
What is often used as a solvent in chemistry?
Water
What is the equation to calculate concentration?
Comcentration= mass/volume
