Sample Test: Physical Science

Physical Science: sample test

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1 Question 1 of 10

Sample S gives three spots. Known dyes D1, D2, D3 and D4 each give one spot. S matches D1, D2 and D4. What is the correct conclusion?

A S contains D1, D2 and D4 but not D3 B S contains all four of the known dyes C S contains the dye D3 and nothing else D S is a single pure substance overall

2 Question 2 of 10

What is the change of state from a liquid to a gas at the boiling point called?

A Boiling B Melting C Freezing D Condensation

3 Question 3 of 10

A particle diagram shows molecules each made of one black and two white atoms bonded together. What is this?

A A mixture of elements B An element C An alloy D A compound

4 Question 4 of 10

Why does a higher concentration make a reaction faster?

A The particles become bigger and move more slowly B The particles lose energy and collide less often C More particles in each volume, so more collisions D The particles change into different substances

5 Question 5 of 10

True or false: the noble gases become denser going down Group VIII.

A False, because helium is the densest noble gas B False, because their densities do not change C True, because the atoms become heavier going down D True, because they become liquids at the bottom

6 Question 6 of 10

Which type of compound usually has a high melting point?

A Simple molecules held together by covalent bonds B Giant lattices made of oppositely charged ions C Gases such as methane and carbon dioxide D Liquids such as water, ethanol or petrol

7 Question 7 of 10

Why does graphite conduct electricity?

A Each carbon atom has one delocalised electron B Each carbon atom has four fixed electrons C It contains positive and negative ions D It has weak forces between the atoms

8 Question 8 of 10

Pen P has spots at 2 cm and 4 cm. Pen Q has one spot at 4 cm. Pen R has spots at 2 cm and 4 cm. Which pens could contain the same dyes?

A Pens P and R, because their spots match at both heights B Pens P and Q, because both pens have a spot at 4 cm C Pens Q and R, because both pens have a spot at 4 cm D All three pens, because every pen has a spot at 4 cm

9 Question 9 of 10

What is an ion?

A A charged particle made when atoms lose or gain electrons B A neutral particle made when atoms share their electrons C A particle with no electrons found inside the nucleus D A neutral atom with equal numbers of protons and neutrons

10 Question 10 of 10

Compare Cl2 and HCl. Which statement is correct?

A Cl2 has two shared pairs and HCl has one B Each has one shared pair of electrons here C Cl2 has no shared pair and HCl has one D HCl has two shared pairs and Cl2 has one

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