Unit 2 exam prep

In this equation,
CuCl₂ + NaOH  → Cu(OH)₂ + NaCl
Which product is insoluble?

• copper(II) hydroxide
• sodium chloride
• sodium hydroxide
• copper(II) chloride

Tags

NGSS.HS-PS1-1

What are the spectator ions in this reaction?
CuCl₂(aq) + NaOH(aq) → Cu(OH)₂(s) + NaCl(aq)
 

• Cu²⁺ and OH^1-
• Na²⁺ and Cl^2-
• Na¹⁺ and Cl^1-
• Na¹⁺ and OH^1-

Which of the following does NOT form a precipitate?

• Pb(NO₃)₂(aq) + 2KI(aq) →
• Sr(NO₃)_{2 (aq)} + K₂SO_4(aq) →
• AgNO₃(aq) + Na₂S(aq) →
•  Pb(NO₃)₂(aq) + AgNO₃(aq) →

Tags

NGSS.HS-PS1-3

An aqueous solution of ammonium phosphate is placed into an aqueous solution of Sodium sulphate. what would be the net ionic equation

• no net equation therefore no observable reaction
• NH₄⁺ + SO₄^2- → (NH₄)₂SO₄
• Na⁺ + PO₄^3- →  (Na)₂PO₄
• Na⁺ + SO₄^2- →(Na)₂SO₄

Tags

NGSS.HS-PS1-2

Compound starts with an "H"

• acid

• base

• both an acid and a base

Tags

NGSS.HS-PS1-5

What is the percent composition by mass of sulfur in the compound MgSO₄ (gram formula mass = 120 g/mol)?

• 20%
• 27%
• 46%
• 53%

Which pair has the same empirical formula?

• NaCrO₄ and Na₂Cr₂O₇
• C₂H₄O₂ and C₆H₁₂O₆
• C₃H₆O₃ and C₂H₆O₂
• CH₄ and C₂H₆

A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?

• Mg₄N₃
• MgN₂
• Mg₃N₂ 
• MgN

A formula with the lowest whole # ratio of elements in a compound is called

• Molecular Formula
• Chemical Formula
• Empirical Formula 
• Distance Formula

When calculating the EF the mole ratio is given as follows:
H₁O_{3.5
What will the EF be?}

• H₁O_3.5
• HO_3.5
• HO₄
• H₂O₇