Chemical Reactions Quiz

You are given a test tube containing zinc granules and dilute hydrochloric acid. After a few minutes, bubbles start to form. What is the chemical reaction happening here?

• Zinc reacts with hydrochloric acid to form hydrogen gas and zinc chloride.

• Zinc reacts with hydrochloric acid to form water and zinc chloride.

• Zinc reacts with hydrochloric acid to form hydrogen gas and chlorine gas.

• Zinc reacts with hydrochloric acid to form hydrogen gas and sulfuric acid.

When magnesium metal reacts with oxygen in the air, it burns with a bright light, forming a white powder. What is the chemical formula of the white powder?

• MgO

• MgCl₂

• Mg(OH)₂

• MgSO₄

In a laboratory, potassium reacts with water to form potassium hydroxide and hydrogen gas. What is the correct equation for this reaction?

• 2K + 2H₂O → 2KOH + H₂

• 2K + H₂O → 2KOH + H₂

• 2K + 2H₂O → KOH + H₂

• K + H₂O → KOH + H₂

When iron filings are heated in oxygen, they form iron oxide. What is the balanced chemical equation for this reaction?

• 3Fe + O₂ → Fe₃O₄

• 4Fe + 3O₂ → 2Fe₂O₃

• 2Fe + O₂ → Fe₂O₃

• Fe + O₂ → Fe₂O₃

A student combines sodium bicarbonate (NaHCO₃) with acetic acid (CH₃COOH). The reaction produces a gas. What gas is produced?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

In an experiment, sodium chloride (NaCl) is reacted with sulfuric acid (H₂SO₄) to produce hydrogen chloride gas and sodium bisulfate. What type of reaction is this?

• Combination reaction

• Decomposition reaction

• Displacement reaction

• Double displacement reaction

When an excess of hydrochloric acid is added to zinc carbonate, zinc chloride, carbon dioxide, and water are formed. What is the balanced chemical equation for this reaction?

• ZnCO₃ + 2HCl → ZnCl₂ + CO₂ + H₂O

• ZnCO₃ + HCl → ZnCl₂ + CO₂ + H₂O

• ZnCO₃ + 2HCl → ZnCl₂ + H₂O

• ZnCO₃ + HCl → ZnCl₂ + CO₂

You heat calcium carbonate (CaCO₃), and it decomposes into calcium oxide (CaO) and carbon dioxide (CO₂). What is the type of reaction occurring?

• Combination

• Decomposition

• Displacement

• Combustion

When you place a piece of sodium in water, it floats and produces a gas. What type of gas is produced during this reaction?

• Oxygen

• Hydrogen

• Nitrogen

• Carbon dioxide

A reaction takes place between copper (Cu) and silver nitrate (AgNO₃). What is the product of this reaction?

• Copper nitrate (Cu(NO₃)₂)

• Copper sulfate (CuSO₄)

• Silver (Ag)

• Silver chloride (AgCl)