quantitative chemistry

Question 1

conservation of mass

Answer 1

in chemical reaction, the total mass of products is equal to the total mass of the reactants

Question 2

in conversation of mass…

Answer 2

• mass is kept the same because no atoms are lost or made

- chemical equation must be balanced

Question 3

many chemical reactions…

Answer 3

involve solutions

Question 4

concentration of a solution:

Answer 4

may be given by the mass of absolute per given volume of solution

Question 5

relative formula mass

Answer 5

the sum of the relative atomic masses of all the atoms in the number shown in the formula
(are shown in the periodic table)

Question 6

changes in mass

Answer 6

happens when reactions are carried out in a non-closed system & include a gas that can enter & leave

Question 7

mole

Answer 7

a measure of the n of particles contained in a substance

Question 8

amount =

n of moles

Answer 8

mass of substance
————————————
atomic (or formula) mass

Question 9

balanced equations

Answer 9

• show the n of moles of each product and reactant

- used to calculate the mass of the reactants and products

Question 10

limiting reactants

Answer 10

-when 2 chemicals react and 1 is used up, it stops the reaction going any further