AQA GCSE Chemistry Unit C2 Verified Solutions
1. What is the positively charged particle found in the nucleus of an atom?
Answer: Protons are positively charged particles that reside in the nucleus of an atom.
2. What is a subatomic particle with no electric charge?
Answer: Neutrons are subatomic particles with the same mass as protons but no electric charge.
3. What is a tiny, negatively charged particle that orbits the nucleus of an atom?
Answer: Electrons are tiny, negatively charged particles that move around the nucleus of an atom.
4. What is the number of protons in the nucleus of an atom?
Answer: The atomic number is the number of protons present in the nucleus of an atom.
5. What is the number of protons and neutrons in the nucleus of an atom?
Answer: The mass number is the total number of protons and neutrons present in the nucleus of an
atom.
6. What is a standard unit of measurement for a substance?
Answer: A mole is a unit of measurement that represents a specific amount of a substance, equal to 6.02
x 10^23 particles.
7. What type of substance releases H+ ions into a solution?
, Answer: Acids are substances that release H+ ions into a solution, lowering the pH.
8. What type of substance releases OH- ions into a solution?
Answer: Alkalis are substances that release OH- ions into a solution, raising the pH.
9. What type of substance is formed by replacing hydrogen in an acid with a metal?
Answer: Soluble salts are compounds formed by replacing hydrogen in an acid with a metal.
10. What type of bond involves sharing a pair of electrons between atoms in a molecule?
Answer: Covalent bonds are chemical bonds that involve sharing a pair of electrons between atoms in a
molecule.
11. What type of bond is formed by the attraction between positively charged metal ions and
delocalized electrons?
Answer: Metallic bonds are formed by the attraction between positively charged metal ions and
delocalized electrons.
12. What type of structure has many atoms joined together by strong covalent bonds?
Answer: Giant covalent structures are made up of many atoms joined together by strong covalent
bonds, resulting in high melting points and poor electrical conductivity.
13. What type of structure is hard, brittle, and has high melting and boiling points?
Answer: Ionic structures are made up of giant crystals that are hard, brittle, and have high melting and
boiling points, and conduct electricity when molten or dissolved in water.
1. What is the positively charged particle found in the nucleus of an atom?
Answer: Protons are positively charged particles that reside in the nucleus of an atom.
2. What is a subatomic particle with no electric charge?
Answer: Neutrons are subatomic particles with the same mass as protons but no electric charge.
3. What is a tiny, negatively charged particle that orbits the nucleus of an atom?
Answer: Electrons are tiny, negatively charged particles that move around the nucleus of an atom.
4. What is the number of protons in the nucleus of an atom?
Answer: The atomic number is the number of protons present in the nucleus of an atom.
5. What is the number of protons and neutrons in the nucleus of an atom?
Answer: The mass number is the total number of protons and neutrons present in the nucleus of an
atom.
6. What is a standard unit of measurement for a substance?
Answer: A mole is a unit of measurement that represents a specific amount of a substance, equal to 6.02
x 10^23 particles.
7. What type of substance releases H+ ions into a solution?
, Answer: Acids are substances that release H+ ions into a solution, lowering the pH.
8. What type of substance releases OH- ions into a solution?
Answer: Alkalis are substances that release OH- ions into a solution, raising the pH.
9. What type of substance is formed by replacing hydrogen in an acid with a metal?
Answer: Soluble salts are compounds formed by replacing hydrogen in an acid with a metal.
10. What type of bond involves sharing a pair of electrons between atoms in a molecule?
Answer: Covalent bonds are chemical bonds that involve sharing a pair of electrons between atoms in a
molecule.
11. What type of bond is formed by the attraction between positively charged metal ions and
delocalized electrons?
Answer: Metallic bonds are formed by the attraction between positively charged metal ions and
delocalized electrons.
12. What type of structure has many atoms joined together by strong covalent bonds?
Answer: Giant covalent structures are made up of many atoms joined together by strong covalent
bonds, resulting in high melting points and poor electrical conductivity.
13. What type of structure is hard, brittle, and has high melting and boiling points?
Answer: Ionic structures are made up of giant crystals that are hard, brittle, and have high melting and
boiling points, and conduct electricity when molten or dissolved in water.
