Standard 3 Review Day

Does the following reaction follow the law of conservation of mass?

• yes

• no

WHY does the following diagram not follow the law of conservation of mass?

• number of molecules changes

• arrangement of atoms changes

• number of atoms changes

Using the balanced equation, if 12 moles of Fe react, how much N2 would be needed?

Using the balanced equation, if 3 moles of Fe react, how much sodium nitride would be produced?

How many grams are in half a mole of magnesium chloride?

• 47.5 grams

• 190 grams

• 19 grams

• 475 grams

How many moles are in 59.75 grams PbS?

• 25 moles

• 2.5 moles

• 0.25 moles

• 14,280.25 moles

How many grams of chlorine will be needed to completely react with 2.3 g of sodium (Na)?

• 3.55 grams

• 2.3 grams

• 8.1 grams

• 5.8 grams

What is the charge of calcium? (Ca) _____

What is the charge of Phosphorus (P)? _____

• Ca = +1

  P = -2

• Ca = +2

  P = -3

• Ca = +2

  P = -5