AQA A-Level Chemistry Past Paper
Questions.
The sample is bombarded with high energy electrons and knocks out an electron forming 1+
rubidium ions through using an electron gun. - Correct Answers-Explain how the gaseous atoms
of rubidium are ionized in a mass spectrometer(2)
Rb(g)---Rb+(g)+e(-) - Correct Answers-Write an equation, including state symbols, to show the
process that occurs when the first ionization energy of rubidium is measured(1
1) Shake the final solution in the flask.
2)Ensure the bottom of the (liquid)meniscus is on the graduation mark.
3)Wash the wet rod into the flask. - Correct Answers-Read the following instructions that
describe how to make up a standard solution of a solid in a volumetric flask.
Answer the questions which follow.
"Take a clean 250cm3 volumetric flask. Use the balance provided and a clean, dry container, to
weigh out the amount of solid required.
Tip the solid into a clean, dry 250cm3 beaker and add about 100cm3 of distilled water.
Use a stirring rod to help the solid dissolve, carefully breaking up any lumps of slid with the rod.
When the solid has dissolved, pour the solution into the flask using a filter funnel.
Add water to the flask until the level rises to the graduation mark"
SUGGEST THREE FURTHER INSTRUCTIONS WHICH WOULD IMPROVE THE OVERALL TECHNIQUE
IN THIS ACCOUNT.(3)
Cu2(OH)2CO3+4HCL---2CuCl2+3H20+CO2 - Correct Answers-Compounds containing Cu2+, OH-
and CO3(2-) ions are sometimes described as basic copper carbonates
(a) Solid Cu(OH)2CO3 is added to an excess of dilute hydrochloric acid. A solution of
copper(2)chloride is formed, together with two other products.
(i) Write an equation for the reaction.
bubbles could be observed. - Correct Answers-4a(ii) Suggest one observation which could be
made during the reaction
Simplest whole number ratio of the atoms of each element present in a compound. - Correct
Answers-Suggest what is meant by the term empirical formula(2)
Questions.
The sample is bombarded with high energy electrons and knocks out an electron forming 1+
rubidium ions through using an electron gun. - Correct Answers-Explain how the gaseous atoms
of rubidium are ionized in a mass spectrometer(2)
Rb(g)---Rb+(g)+e(-) - Correct Answers-Write an equation, including state symbols, to show the
process that occurs when the first ionization energy of rubidium is measured(1
1) Shake the final solution in the flask.
2)Ensure the bottom of the (liquid)meniscus is on the graduation mark.
3)Wash the wet rod into the flask. - Correct Answers-Read the following instructions that
describe how to make up a standard solution of a solid in a volumetric flask.
Answer the questions which follow.
"Take a clean 250cm3 volumetric flask. Use the balance provided and a clean, dry container, to
weigh out the amount of solid required.
Tip the solid into a clean, dry 250cm3 beaker and add about 100cm3 of distilled water.
Use a stirring rod to help the solid dissolve, carefully breaking up any lumps of slid with the rod.
When the solid has dissolved, pour the solution into the flask using a filter funnel.
Add water to the flask until the level rises to the graduation mark"
SUGGEST THREE FURTHER INSTRUCTIONS WHICH WOULD IMPROVE THE OVERALL TECHNIQUE
IN THIS ACCOUNT.(3)
Cu2(OH)2CO3+4HCL---2CuCl2+3H20+CO2 - Correct Answers-Compounds containing Cu2+, OH-
and CO3(2-) ions are sometimes described as basic copper carbonates
(a) Solid Cu(OH)2CO3 is added to an excess of dilute hydrochloric acid. A solution of
copper(2)chloride is formed, together with two other products.
(i) Write an equation for the reaction.
bubbles could be observed. - Correct Answers-4a(ii) Suggest one observation which could be
made during the reaction
Simplest whole number ratio of the atoms of each element present in a compound. - Correct
Answers-Suggest what is meant by the term empirical formula(2)
