Test #3 Review 2023

4NH₃ + 5O₂-->4NO + 6H₂O
What is the total number of moles of H₂O produced when 12 mole of NH₃ is completely consumed?

• 15
• 18
• 20
• 24

Tags

NGSS.HS-PS1-7

2Na + 2H₂O → 2NaOH+ H₂
How many grams of hydrogen are produced if 120 g of Na are available?

• 5.2 g
• 2.6 g
• 690 g
• 45 g

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for this compound.

• SO
• SO₂

• SO₃

• SO₄

A ______ is an ionic compound with water molecules loosely attached to the crystal, and to separate the water, you need to add ______.

• hydrate; heat

• anhydrate; heat

• hydrate; pressure

• anhydrate; pressure

What is the percent composition by mass of oxygen in the compound MgSO₄?

• 20%

• 27%

• 46%

• 53%

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 180.18 g/mol?

• CH₂O
• C₂H₄O₂
• C₄H₈O₄
• C₆H₁₂O₆

Predict the products for the this reaction:

K + HCl →

• KCl + H₂

• no reaction

• KH + Cl₂

• HCl + K₂

Predict the products for the this reaction:

AgNO₃ + CuCl₂ →

• AgCl + Cu(NO₃)₂

• AgCu + ClNO₃

• CuAg + NO₃Cl

• AgCl + CuNO₃

What is the new volume of the gas if the pressure on 350. L of oxygen at 720. mm Hg is decreased to 600. mm Hg?

• 420. L

• 29.2 L

• 4200 L

• 292 L

Gas pressure is caused by gas molecules

• colliding with the walls of the container.

• colliding with each other.

• colliding with the walls of the container and each other.

• colliding with the empty space.

Tags

NGSS.HS-PS2-1