Chem Quiz 3

Question 1

What does the n triangle look like?

Answer 1

n=N/Na

Question 2

What does N stand for?

Answer 2

of particles

Question 3

What does n stand for?

Answer 3

The amount in moles.

Question 4

What does Na stand for?

Answer 4

Avogardro’s constant (6.02 x 10^23 particles/mole)

Question 5

What is a mole?

Answer 5

The amount of a substance that contains 6.02 x 10^23 particles (Avogadro’s constant).

Question 6

What does the m triangle look like?

Answer 6

n= m /M

Question 7

What does the m stand for?

Answer 7

mass (g)

Question 8

What does the M stand for?

Answer 8

molar mass (g/mol)

Question 9

How do you find the molar mass?

Answer 9

Take the number of each element and multiply it by its atomic mass. Then, add up all the answers to find the molar mass in g/mol.

Question 10

What is the law of definite proportions?

Answer 10

The elements in a chemical compound are always present in the same proportions by mass.

Question 11

How do you find the % of an element in a compound?

Answer 11

(mass/total mass of compound) x 100

Question 12

What is the Empirical/Simplest formula?

Answer 12

A formula indicating the smallest whole # ratio between the atoms of each element in a molecule.

Question 13

How do you find the empirical formula?

Answer 13

1. Percent to grams
2. g to mols
3. divide each amount by the lesser amount
4. If the numers are still not whole, multiply each one by 2.