Chemistry Practice Quiz

Which is an example of a chemical reaction?

• melting ice

• rusting iron

• water evaporating

• rubbing a maker on paper

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

For the reaction shown here, forty grams of methane are combusted in the presence of excess oxygen. Calculate how many moles of water will form from this reaction.

• 2.5

• 4

• 5

• 40

Tags

NGSS.HS-PS1-7

Consider the reaction of hydrogen gas with chlorine gas: H + Cl → 2HCl 4 molecules of hydrogen gas react with 6 molecules of chlorine gas. 4 molecules of hydrogen gas in this reaction will produce 8 molecules of HCl. 6 molecules of chlorine gas in this reaction will produce 12 molecules of HCl. Which statement BEST describes the role of hydrogen in this chemical reaction?

• Hydrogen is in excess

• Hydrogen serves as a catalyst.

• Hydrogen is the limiting reactant.

• Hydrogen inhibits the rate of reaction.

A chemical reaction has a ΔH of 2764 kJ. This indicates that the chemical reaction that took place was

• endothermic

• exothermic

• neutralization

• solvation

Tags

NGSS.HS-PS1-4

The __________ determines the quantity that can be produced by the reaction.

• ideal reactant

• excess reactant

• limiting reactant

• stoichiometric reactant

For the reaction shown here, predict the number of moles of hydrogen gas needed to produce 32 grams of methane.

• 1

• 2

• 4

• 8

Tags

NGSS.HS-PS1-7

The chemical equation below is unbalanced. Al(OH)₃ + H^₂SO₄ → Al₂ (SO₄)₃ + H₂O What is the coefficient of H₂O when the equation is correctly balanced using the smallest whole-number coefficients?

• 3

• 2

• 4

• 6

Tags

NGSS.MS-PS1-5

When planning an investigation of a chemical reaction that produces a precipitate, which of the following conditions MUST be true?

• Both products are soluble in water.

• One of the reactants must be insoluble in water.

• At least one product is insoluble in water.

• Spectator ions are included in the solution as reactants.

The chemical equation below represents a combustion reaction.

2 C₄H₁₀ + 13O₂ → 8 CO₂ + 10 H₂O

How many moles of carbon dioxide are produced for each mole of butane consumed?

• 1

• 2

• 3

• 4

Cyclohexanol, C₆H₁₁OH, is an organic chemical used in the production of nylon. How many hydrogen atoms are in 2.25 moles of cyclohexanol? Give your answer in scientific notation.

• 5.09 x 10²⁵

• 1.63 x 10²⁵

• 9.62 x 10²⁴

• 1.49 x 10²⁵

Tags

NGSS.MS-PS1-1