Chemical Reactions Test Review

Which of the following evidence of chemical change explains the curdling of milk?

• Evolution of gas

• Formation of precipitates

• Change in temperature

• Production of heat and light

Tags

NGSS.MS-PS1-2

Which of the following would most likely happen when substances undergo chemical reactions?

• No new substances will be formed.

• New substances are formed which are heavier than that of the reactants.

• New substances are formed with the same set of properties as that of the reactants.

• New substances are formed with the different set of properties as that of the reactants.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following laws conforms a balanced chemical reaction?

• Law Relativity

• Law of Conservation of Mass

• Law inertia

• Law of Definite proportion

Tags

NGSS.HS-PS1-7

Potassium chlorate (KClO₃) when heated produces potassium chloride (KCl) and oxygen gas (O₂).

Which of the following equations represents the above reaction?

• KClO_3(s) —-> KCl + O₂↑

• 2KClO_3(s) —> 2KCl_(s) + 3O₂↑

• 2KClO₃ —> 2KCl + O₂

• KClO₃ —> KCl + 3O₂

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

Potassium chlorate (KClO₃) when heated produces potassium chloride (KCl) and oxygen gas (O₂).

Potassium chlorate (KClO₃) had undergone what type of reaction?

• Combination Reaction

• Decomposition Reaction

• Double replacement

• Single replacement

What would be the balanced equation for the combustion of butane, a lighter fluid?

• C₄H₁₀ + O₂ —> 4CO₂ + 5H₂O

• 2C₄H₁₀ + 13O₂ —> 8CO₂ + 10H₂O

• C₄H₁₀ + O₂ —> CO₂ + 5H₂O

• C₄H₁₀ + O₂ —> 4CO₂ + H₂O

Use the table below to answer question,

which metal is most reactive?

Metal Reaction with cold water

Copper No reaction

Rubidium A violent reaction

Strontium A steady reaction

Vanadium Little reaction

• Copper

• Rubidium

• Strontium

• Vanadium

Which of the following is the correct balanced chemical equation for the combustion of natural gas (Methane)?

• CH₄ + 2O₂ —> CO₂ + 2H₂O

• 2CH₄ + O₂ —> 2CO₂ + 4H₂O

• 2CH₄ + 2O₂ —> 2CO₂ + 2H₂O

• 2CH₄ + 4O₂ —> 2CO₂ + H₂O

Tags

NGSS.HS-PS1-7

NaCl + AgNO₃ AgCl +. NaNO₃ is an example of what type of chemical reaction?

• Combination reaction

• Décomposition reaction

• Double replacement

• Single replacement

Which of the following would most likely happen when sodium hydroxide (NaOH) solution and copper sulfate (CuSO₄) are combined?

• Gas will evolve.

• Precipitate will form.

• Temperature will change.

• No reaction

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5