In chemistry, a "mole" is:

• the mass of an atom

• a large number used to count particles

• based on the volume of a substance

Which has more particles?

• 1 mole H₂O

• 1 mole Al(OH)₃

• 1 mole NaCl

• They are all the same

How many atoms of iodine are there in a mole of iodine?

• 53

• 63.55g

• 126.9

• 6.02 x 10²³

The Law of Conservation of Mass states

• that matter exists in all states and reacts the same
• that matter can only be changed into new substances by introducing a catalyst
• that matter exists in the same state throughout any chemical change
• that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

Tags

NGSS.HS-PS1-7

What is the A_r of Li?

• 3

• 4

• 7

What is the M_r of H₂O?

• 16

• 17

• 18

• 20

What would be the mass of 1.5mol H₂O

• 20g

• 27g

• 32g

• 40g

What is the M_r of Ca(OH)₂

• 18

• 26

• 57

• 74

What is the M_r of CO₂

• 28

• 44

• 56

• 66

What is the molar mass of C₂H₄O₂?

• 40g
• 50g
• 60g
• 68g