3rd 9 Weeks Midterm Review

The equation below is balanced. 2 H₂(g) + O₂(g) → 2 H₂O(g) If 8.0 moles of O₂ are completely consumed, what is the total number of moles of H₂O produced?

• 4

• 8

• 16

• 32

Tags

NGSS.MS-PS1-5

Which substance below has the greatest mass?

• 1 mole of silver

• 1 mole of copper

• 1 mole of lead

• 1 mole of tungsten

How many grams of N₂ are in 3.0 x 10²³ molecules of N₂?

• 2.0 g of N₂

• 14 g of N₂

• 38 g of N₂

• 71 g of N₂

What is the approximate total number of atoms in 1.0 mole of lithium?

• 3.0

• 6.9

• 1.0 x 10²³

• 6.0 x 10²³

How many atoms are in a 59 g sample of gold?

• 3.00 atoms

• 116,000 atoms

• 1.81 x 10²⁴ atoms

• 3.60 x 10²⁵ atoms

What is the molar mass of CaF₂?

• 40.0 g/mol

• 78.0 g/mol

• 99.0 g/mol

• 56.0 g/mol

Which of the following is an empirical formula for a compound?

(hint: lowest ratio of elements)

• N₂H₂

• C₂H₄

• NH₃

• N₂H₆

The equation below represents the reaction between a metal and a solution.

Mg + 2 HCl → MgCl2 + H2

How many grams of HCl react when 2 mole of H2 is produced? (molar mass of HCl=36.46 g/mol)

• 2.008 g

• 4.016 g

• 73 g

• 146 g

Tags

NGSS.HS-PS1-7

Which of the following statements about benzene (C₆H₆) is true?

• The empirical formula is C₆H_6.

• The molecular formula is C₆H_6.

• Both the empirical and molecular formulas are C₆H₆.

• Neither the empirical nor molecular formula is C₆H₆.

Consider the reaction below:

__H₂ (g) +__ N₂ (g) → __NH₃ (g).

Balance the equation above.

What are the coefficients that balance the equation?

• 1, 1, 1

• 3, 1, 2

• 2, 1, 3

• 1, 2, 3

Tags

NGSS.HS-PS1-7