Chemical Reactions Group 1 and 7

Which metal explodes on contact with water?

• Lithium

• Potassium

• Caesium

• Sodium

Which metal fizzes gently when placed in water?

• Lithium

• Potassium

• Caesium

• Sodium

What is the name of the compound formed when lithium reacts with water?

• Lithium Hydroxide

• Lithium Oxide

• Lithium Carbonate

• Lithium Chloride

What is the chemical formula for lead(II) nitrate?

• Pb(NO₃)₂

• PbCl₂

• NaCl

• NaNO₃

At what volume of lead(II) nitrate added does the height of the precipitate first reach 2.1 cm?

• 6.0 cm³

• 8.0 cm³

• 10.0 cm³

• 12.0 cm³

What is the height of the precipitate when 10.0 cm³ of lead(II) nitrate is added?

• 1.8 cm

• 2.1 cm

• 2.5 cm

• 3.0 cm

What is the height of the precipitate when 6.0 cm³ of lead(II) nitrate is added?

• 0.6 cm

• 1.2 cm

• 1.8 cm

• 2.1 cm

What is the balanced chemical equation for the reaction between lead(II) nitrate and sodium chloride?

• Pb(NO₃)₂ + 2NaCl → PbCl₂ + 2NaNO₃

• Pb(NO₃)₂ + NaCl → PbCl₂ + NaNO₃

• 2Pb(NO₃)₂ + NaCl → PbCl₂ + NaNO₃

• Pb(NO₃)₂ + NaCl → PbCl₂ + NaNO₃

What happens to the height of the precipitate when 12.0 cm³ of lead(II) nitrate is added compared to 10.0 cm³?

• It increases.

• It decreases.

• It remains the same.

• It doubles.

What is the main variable being changed in the student's experiment?

• Volume of sodium chloride solution

• Volume of lead(II) nitrate solution

• Temperature of the solution

• Type of boiling tube