Chemistry Review

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

• 53
• 63.55g
• 126.9
• 6.02 x 10²³

The number 6.02 x 10²³ is called...

• Atom's number

• Bohr's number

• Mole's number

• Avogadro's number

Tags

NGSS.HS-PS1-7

Which would have more atoms?

• 1 mole of Li

• 1 mole of Au

• 1 mole of Si

• None, all are equal

What is the molar mass of AuCl₃?

• 96 g

• 130 g

• 232.5 g

• 303.3 g

What will the percent yield of a reaction be if the theoretical yield is 40.5 g Cu and experimentally a yield of 38.7 g Cu was measured?

• 82%

• 105%

• 87%

• 95.6%

N₂ +  3H₂ → 2NH₃ 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 6

• 2

• 3

• 1

When two substances react to form products, what is the reactant that is used up first called?

• explosive reactant

• true reactant

• limiting reactant

• excess reactant

What is conserved in every chemical reaction?

• mass and molecules

• mass and liters

• mass and atoms

• mass and moles

Tags

NGSS.HS-PS1-7

Balance this equation:
P₄+O₂  -->  P₂O₃

• 3 P₄+ O₂ --> 2 P₂O₃

•  P₄+ O₂ --> 2 P₂O₃

•  P₄+ 3 O₂ --> 2 P₂O₃

•  P₄+ 2 O₂ --> 3 P₂O₃

Tags

NGSS.HS-PS1-7

When looking at a chemical equation, what tells you the mole ratios?

• the subscripts (small numbers at the bottom)

• the element symbols

• the coefficients

• 15.0