Chem revision Unit 1 - 11

Which diagram shows the process of diffusion?

• A

• B

• C

• D

A student investigates how the concentration of an acid affects the speed of reaction with a 0.5 g mass of magnesium at 30°C. The student has a beaker, concentrated acid, water and the apparatus below.

P a balance

Q a clock

R a measuring cylinder

S a thermometer

Which pieces of apparatus does the student use?

• P, Q and R only

• P, Q and S only

• Q, R and S only

• P, Q, R and S

Which method is most suitable to obtain zinc carbonate from a suspension of zinc carbonate in water?

• crystallisation

• distillation

• evaporation

• filtration

The electronic structures of atoms P and Q are shown. P and Q react to form an ionic compound. What is the formula of this compound?

• PQ₂

• P₂Q

• P₂Q₆

• P₆Q₂

An element Y has the proton number 18. The next element in the Periodic Table is an element Z. Which statement is correct?

• Element Z has one more electron in its outer shell than element Y.

• Element Z has one more electron shell than element Y.

• Element Z is in the same group of the Periodic Table as element Y.

• Element Z is in the same period of the Periodic Table as element Y.

Which atom has twice as many neutrons as protons?

• A

• B

• C

• D

Which is a simple covalent molecule?

• A

• B

• C

• D

The equation for the reaction between magnesium and dilute sulfuric acid is shown. Which mass of magnesium sulfate will be formed if 12 g of magnesium are reacted with sulfuric acid?

• 5g

• 10g

• 60g

• 120g

Winston Churchill, a British Prime Minister, had his false teeth electroplated with gold. The teeth were coated with a thin layer of carbon and were then placed in the apparatus shown. Which of the following is correct?

• terminal X is negative, the carbon powder could be diamond

• terminal X is negative, the carbon powder could be graphite

• terminal X is positive, the carbon powder could be diamond

• terminal X is positive, the carbon powder could be graphite

The apparatus shown is used to measure the speed of a reaction. Which equation represents a reaction where the speed can be measured using this apparatus?

• Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)

• HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O(l)

• Fe(s) + CuSO₄(aq) → Cu(s) + FeSO₄(aq)

• 2Na(s) + Br₂(l) → 2NaBr(s)