Paper 1 Chemistry Aqa

Question 1

What is the atomic number of an element?

Answer 1

The atomic number is the number of protons in the nucleus of an atom.

Question 2

True or False: The mass number is the sum of protons and electrons in an atom.

Answer 2

False. The mass number is the sum of protons and neutrons.

Question 3

Fill in the blank: The chemical formula for water is ____.

Answer 3

H2O

Question 4

What is the pH range of acids?

Answer 4

The pH range of acids is from 0 to 7.

Question 5

What is the main gas produced during respiration?

Answer 5

Carbon dioxide (CO2)

Question 6

Which particle has a negative charge?

Answer 6

Electron

Question 7

What is the process of a solid turning into a gas called?

Answer 7

Sublimation

Question 8

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

Answer 8

A) Sodium

Question 9

What is the law of conservation of mass?

Answer 9

The law states that mass cannot be created or destroyed in a chemical reaction.

Question 10

True or False: An isotope has the same number of protons but a different number of neutrons.

Answer 10

True

Question 11

What is the formula for calculating the number of moles?

Answer 11

Moles = mass (g) / molar mass (g/mol)

Question 12

What is the name of the process where a liquid changes to a gas?

Answer 12

Evaporation

Question 13

Fill in the blank: The element with the symbol ‘O’ is ____.

Answer 13

Oxygen

Question 14

What is the primary function of enzymes in chemical reactions?

Answer 14

Enzymes act as catalysts to speed up reactions.

Question 15

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

Answer 15

A) Helium

Question 16

What is a covalent bond?

Answer 16

A covalent bond is a chemical bond formed by the sharing of electrons between atoms.

Question 17

What does the term ‘exothermic reaction’ refer to?

Answer 17

An exothermic reaction releases energy, usually in the form of heat.

Question 18

True or False: All metals are good conductors of electricity.

Answer 18

True

Question 19

What is the difference between an ionic bond and a covalent bond?

Answer 19

An ionic bond involves the transfer of electrons, while a covalent bond involves the sharing of electrons.

Question 20

What is the molar volume of an ideal gas at standard temperature and pressure (STP)?

Answer 20

22.4 liters

Question 21

Fill in the blank: Acids produce ____ ions in solution.

Answer 21

Hydrogen (H+)

Question 22

What is the term for the amount of substance in a given volume?

Answer 22

Concentration

Question 23

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

Answer 23

C) Sour taste

Question 24

What is the principle behind chromatography?

Answer 24

Chromatography separates mixtures based on different affinities for a stationary and mobile phase.

Question 25

True or False: The boiling point of water decreases as atmospheric pressure increases.

Answer 25

False. The boiling point increases with higher atmospheric pressure.

Question 26

What is the significance of the periodic table?

Answer 26

The periodic table organizes elements based on their atomic number, electron configuration, and recurring chemical properties.