CIA #3 Review Units 7-9 Chemistry

How many moles of potassium oxide (K2O) will be formed when 1.52 moles of potassium reacts with oxygen according to the following reaction: 4 K + O2 → 2 K2O?

• 0.76 moles

• 1.52 moles

• 0.38 moles

• 3.04 moles

How many moles of copper are needed to react with sulfur to produce 120 grams of copper(I) sulfide according to the following reaction: 2 Cu + S → Cu2S?

• 0.5 moles

• 1 mole

• 2 moles

• 3 moles

What mass of iron is needed to react with sulfur in order to produce 96 grams of iron (III) sulfide according to the following equation? 2 Fe + 3 S → Fe2S3.

• 32 grams

• 56 grams

• 64 grams

• 112 grams

• 6.5 g

• 9.5 g

• 13.0 g

• 19.5 g

• 30.5 g

• 34.0 g

• 28.0 g

• 32.5 g

• 68 g

• 78 g

• 88 g

• 98 g

When all of the limiting reactant is used, the reaction _______.

• stops

• continues

• accelerates

• reverses

14. How much heat is required to raise the temperature of a 825 g block of wood (specific heat = 1.8 J/g°C) from 22.0°C to 155.0°C?

• 196,020 J

• 197,020 J

• 198,020 J

• 199,020 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

Calculate the heat of formation for the following reaction: CH₄ + 3 Cl₂ → CHCl₃ + 3 HCl. Given the following information: CH₄ ΔH = -74.8 kJ, Cl₂ ΔH = -132.1 kJ, HCl ΔH = -76.0 kJ, CHCl₃ ΔH = -92.0 kJ.

• -151.1 kJ

• -200.0 kJ

• -100.5 kJ

• -50.0 kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

How many electrons can each of the following sublevels hold: s, p?

• s = 2, p = 6

• s = 1, p = 3

• s = 2, p = 4

• s = 3, p = 6