Year 9 Data Test Revision

Describe the Limewater test

• The gas is bubbled into the limewater causing a colour change due to a pH indicator.

• The gas is bubbled into the limewater and the acid makes the limewater go milky.

• The gas is bubbled into the limewater and makes the limewater go milky if it is CO₂.

• The gas is bubbled into the limewater and the tube will make a "pop" sound.

Calcium Nitrate, Ca(NO₃)_2, contains _ oxygen atoms.

(a)  

Which is the correct formula for Calcium Carbonate?

• CaCO₃

• Ca(CO₃)₂

• Ca₂(CO₃)₂

• Ca₂(CO₃)

Which general word equation describes the reaction in the left test tube.

• Acid + Metal → Salt + Water

• Acid + Base → Salt + Limewater

• Acid + Carbonate → Salt + Water + Carbon Dioxide

• Acid + Metal → Limewater + Carbon Dioxide

Which one of the following statements is true based on the reaction description.

• The reaction makes twice as much products as reactants.

• If you perform this experiment in the lab you will make exactly 1 CO₂ and 2 H₂O.

• Under a microscope Oxygen appears red.

• 44 CH₄ would react to make 88 H₂0.

When steel wool burns in air how would the mass of the steel, measured by scales, compare to the mass of products remaining on the scales afterwards? The reaction would be something like this;

4 Fe _(s) + 3 O_{2 (s)} → 2 Fe₂O_{3 (s)}

• Greater mass on scales

• Lesser mass on scales

• Equal mass on scales

What can we determine about the solutions on the left and right?

• Acid in left,

  Base in right.

• Base in left,

  Acid in right.

• It is an acid in both beakers.

• Both could be neutral.

What is the correct general word equation for Hydrochloric acid, HCl reacting with Sodium Hydroxide, NaOH?

• Acid + Base → Salt + Water

• Acid + Carbonate → Salt + Water

• Acid + Metal → Salt + Hydrogen

• Acid + Base → Salt + Hydrogen

What is the correct general word equation for HCl, Hydrochloric Acid, reacting with Magnesium Carbonate, Mg(CO₃)₂?

• Acid + Base → Salt + Water

• Acid + Carbonate → Salt + Water + Carbon Dioxide

• Acid + Carbonate → Salt + Water + Hydrogen

• Acid + Metal → Carbon Dioxide + Water

What type of energy is indicated on the y-axis?

• Energy of surroundings

• Heat Energy

• Chemical Energy

• Gravitational Energy