10 minutes Define the term reaction rate in words. 1.1 Learners use the reaction between IMPURE POWDERED calcium carbonate and excess (2) hydrochloric acid to investigate reaction rate. The balanced equation for the reaction is: 1.2 CaCO3(s) + + + CO2(g) 2HCℓ(aq) → CaCℓ2(aq) H2O(ℓ) They perform four experiments under different conditions of concentration, mass and temperature as shown in the table below. They use identical apparatus in the four experiments and measure the volume of gas released in each experiment. The results of experiments 1 and 3 are compared in the investigation. Write down the: 1.2.1 Independent variable 1.2.2 Dependent variable Use the collision theory to explain why the reaction rate in experiment 4 will be higher than that in experiment 3. Learners obtain graphs A, B, C and D below for their results. (1) (1) (3) 1.3
1.1 1.2 1.3 10 minutes Define the term reaction rate in words. Learners use the reaction between IMPURE POWDERED calcium carbonate and excess hydrochloric acid to investigate reaction rate. The balanced equation for the reaction is: CaCO3(s) + 2HCℓ(aq) → CaCℓ2(aq) + H2O(ℓ) + CO2(g) They perform four experiments under different conditions of concentration, mass and temperature as shown in the table below. They use identical apparatus in the four experiments and measure the volume of gas released in each experiment. The results of experiments 1 and 3 are compared in the investigation. Write down the: 1.2.1 Independent variable 1.2.2 Dependent variable Use the collision theory to explain why the reaction rate in experiment 4 will be higher than that in experiment 3. Learners obtain graphs A, B, C and D below for their results. (2) (1) (1) (3)
gr-12-t2-physical-science-workshop-manual-2018.docx