Spring Benchmark

In the procedure shown above, a calcium chloride solution is mixed with a sodium sulfate solution to create the products shown. Which of the following is illustrated by this activity?

• The law of conservation of mass

• The theory of thermal equilibrium

• The theory of covalent bonding

• The law of conservation of momentum

What are the coefficients of the correctly balanced equation for the following reaction?

? Fe₂O₃ + ? CO → ? Fe + ? CO₂

• 1,3,2,3

• 0,2,2,3

• 1,2,2,3

• 2,6,4,3

What are the coefficients of the correctly balanced equation for the following reaction?

? Ca(C₂H₃O₂)₂ + ? K₃PO₄ → ? Ca₃(PO₄)₂ + ? KC₂H₃O₂

• 3,2,1,6

• 3,3,1,2

• 6,2,1,6

• 6,1,1,3

Aluminum + Sulfuric Acid → Aluminum Sulfate + Hydrogen gas

Which of the following is the balanced chemical equation for the reaction shown above?

• Al + H₂SO₄ → Al₂(SO₄)₃ + H₂

• 2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂

• 2Al + H₂SO₄ → Al₂(SO₄)₃ + H₂

• 2Al + 3H₂SO₄ → Al₂(SO₄)₃ + H₂

Students are given 2 samples of material. The first sample contains 1 mole of iron (Fe), and the second sample contains 1 mole of lithium (Li). Which of the following statements best describes how these samples compare to one another?

• Sample 1 contains more atoms than sample 2

• Each sample contains the same number of atoms

• Both samples have the same mass when placed on a scale

• Sample 2 has a greater mass than sample 1

Which product balances the chemical equation below?

3AgNO_{3 (aq)} +FeCl_{3 (aq)} → 3AgCl _(s) + ?

• FeCl (aq)

• FeCl₂ (aq)

• FeNO₃ (aq)

• Fe (NO₃)₃ (aq)

Lithium hydroxide neutralizes nitric acid to yield lithium nitrate and water.

Which of the following chemical equations is correctly balanced and accurately describes the reaction written here.

• 2LiOH +HNO₃ → 2LiNO₃ + H₂O

• LiNO₃ +2H₂O → 2LiOH +HNO₃

• LiOH +HNO₃ → LiNO₃ + H₂O

• LiNO₃ + H₂O → LiOH +HNO₃

Which chemical equation supports the law of conservation of mass?

• Al₄C_{3 (s)} + H₂O _(l) → CH_{4 (g)} + Al(OH)_{3 (s)}

• CH_{4 (g)} + 2O_{2 (g)} → CO_{2 (g)} + 2H₂O _(g)

• Zn _(s) + HCl _(aq) → ZnCl_{2 (aq)} + H_{2 (g)}

• 2H₂O _(l) → H_{2 (g)} + O_{2 (g)}

Chemicals: 2HI + F₂ → 2HF + I₂

Masses: 2HI=w, F₂₌ x, 2HF=y, I₂₌ z

In a single-displacement reaction, the chemical change show above occurs. Which equation supports the law of conservation of mass?

• x=z

• w + x = y + z

• w = y

• w + x = 2(y + z)

Which of the following equations is balanced?

• CH₄ + Cl₂ → CH₂Cl₂ + HCl

• H₂SO₄ + 2NaOH → Na₂SO₄ + H₂O

• Al(OH)₃ +H₃PO₄ → AlPO₄ + 2H₂O

• H₂O + MgO → Mg(OH)₂