Chemistry Final Exam Review Pt. 4

The volume of one mole of a substance is 22.4 L at STP for all ____.

• gases

• liquids

• solids

• compounds

The molar volume of a gas at STP occupies ____.

• 22.4 L

• 0 °C

• 1 kilopascal

• 12 grams

What is the volume, in liters, of 0.500 mol of C₃H₈ gas at STP?

• 0.0355 L

• 11.2 L

• 16.8 L

• 22.4 L

If the density of a noble gas is 1.783 g/L at STP, that gas is ____.

• Kr

• Xe

• Ar

• He

If 60.2 grams of Hg combines completely with 24.0 grams of Br to form a compound, what is the percent composition of Hg in the compound?

• 28.5%

• 39.9%

• 71.5%

• 60.1%

Tags

NGSS.HS-PS1-7

What is the percent by mass of carbon in acetone, C₃H₆O?

• 20.7%

• 62.1%

• 1.61%

• 30.0%

The lowest whole-number ratio of the elements in a compound is called the ____.

• empirical formula

• molecular formula

• binary formula

• representative formula

What is the empirical formula of a compound that is 40% sulfur and 60% oxygen by weight?

• SO

• SO₂

• SO₃

• S₆O₄

What does the symbol Δ in a chemical equation mean?

• Heat is supplied to the reaction.

• A catalyst is needed.

• yields

• precipitate

In the chemical equation H₂O₂(aq) → H₂O(l) + O₂(g), the O₂ is a ____.

• catalyst

• solid

• product

• reactant

Tags

NGSS.HS-PS1-7