Combined Science Chemistry Paper 1

Question 1

What is the basic unit of a chemical element?

Answer 1

Atom

Question 2

True or False: A compound is made up of two or more different types of atoms bonded together.

Answer 2

True

Question 3

Fill in the blank: The process of a liquid turning into a gas is called ______.

Answer 3

Evaporation

Question 4

What is the pH range of acids?

Answer 4

0 to 6

Question 5

Define the term ‘reactant’.

Answer 5

A substance that takes part in a chemical reaction.

Question 6

What is the symbol for Sodium?

Answer 6

Na

Question 7

Multiple Choice: Which of the following is an alkali metal? A) Magnesium B) Sodium C) Iron

Answer 7

B) Sodium

Question 8

What type of bond is formed when electrons are shared between atoms?

Answer 8

Covalent bond

Question 9

True or False: Metals are good conductors of electricity.

Answer 9

True

Question 10

What is the chemical formula for water?

Answer 10

H2O

Question 11

Fill in the blank: ______ is the process of a solid turning directly into a gas.

Answer 11

Sublimation

Question 12

What do the letters ‘AQA’ stand for in the context of GCSE exams?

Answer 12

Assessment and Qualifications Alliance

Question 13

What is the difference between an element and a compound?

Answer 13

An element is a pure substance made of one type of atom, while a compound consists of two or more different types of atoms chemically bonded together.

Question 14

Multiple Choice: Which gas is produced when an acid reacts with a metal? A) Oxygen B) Hydrogen C) Carbon Dioxide

Answer 14

B) Hydrogen

Question 15

What is the term for the amount of space an object occupies?

Answer 15

Volume

Question 16

True or False: All chemical reactions involve a change in mass.

Answer 16

False

Question 17

What is the term for a mixture that has a uniform composition throughout?

Answer 17

Homogeneous mixture

Question 18

Fill in the blank: The atomic number of an element is the number of ______ in its nucleus.

Answer 18

Protons

Question 19

What is the periodic table used for?

Answer 19

To organize elements based on their atomic number and properties.

Question 20

What is a catalyst?

Answer 20

A substance that increases the rate of a chemical reaction without being consumed.

Question 21

Multiple Choice: Which of the following is a property of metals? A) Brittle B) Dull C) Malleable

Answer 21

C) Malleable

Question 22

True or False: Ionic bonds involve the transfer of electrons.

Answer 22

True

Question 23

What is the formula for calculating density?

Answer 23

Density = Mass / Volume

Question 24

Fill in the blank: The process of separating a mixture by boiling and condensing is called ______.

Answer 24

Distillation

Question 25

What does the term 'exothermic reaction' mean?

Answer 25

A reaction that releases energy in the form of heat.

Question 26

What is the main gas responsible for greenhouse effect?

Answer 26

Carbon Dioxide

Question 27

Multiple Choice: Which of the following is a noble gas? A) Oxygen B) Helium C) Nitrogen

Answer 27

B) Helium

Question 28

What is the significance of the 'valence electrons'?

Answer 28

They determine how an element reacts chemically.

Question 29

True or False: The law of conservation of mass states that mass is created during a chemical reaction.

Answer 29

False

Question 30

What is the term for the energy required to start a chemical reaction?

Answer 30

Activation energy

Question 31

Fill in the blank: The boiling point of water is ______ degrees Celsius.

Answer 31

100

Question 32

What is a chemical equation?

Answer 32

A representation of a chemical reaction using symbols and formulas.

Question 33

Multiple Choice: Which of the following is a property of acids? A) Bitter B) Sour C) Slippery

Answer 33

B) Sour

Question 34

What is the purpose of a control in an experiment?

Answer 34

To provide a standard for comparison.

Question 35

True or False: All acids contain hydrogen.

Answer 35

True

Question 36

What is the effect of increasing temperature on the rate of a chemical reaction?

Answer 36

It generally increases the rate of reaction.

Question 37

Fill in the blank: The ______ is the part of the atom that contains protons and neutrons.

Answer 37

Nucleus

Question 38

What is the main characteristic of a non-metal?

Answer 38

They are poor conductors of heat and electricity.

Question 39

Multiple Choice: What is produced during the process of photosynthesis? A) Oxygen B) Carbon Dioxide C) Nitrogen

Answer 39

A) Oxygen

Question 40

What does 'solubility' refer to?

Answer 40

The ability of a substance to dissolve in a solvent.

Question 41

True or False: All mixtures are homogeneous.

Answer 41

False

Question 42

What is the term for the smallest particle of a compound that retains its properties?

Answer 42

Molecule

Question 43

Fill in the blank: The process of a gas turning into a liquid is called ______.

Answer 43

Condensation