AQA GCSE Chemistry Topic 1- Atomic Structure Complete Answers
atom
the smallest unit of matter
Here are the rewritten questions in a different structure and with some paraphrasing:
1. What is the fundamental building block of an element, and what does it consist of?
Answer: An element is ...
AQA GCSE Chemistry Topic 1- Atomic Structure Complete Answers
atom
the smallest unit of matter
Here are the rewritten questions in a different structure and with some paraphrasing:
1. What is the fundamental building block of an element, and what does it consist of?
Answer: An element is composed of only one type of atom, which is the smallest unit of matter.
2. What is the difference between a molecule and a compound?
Answer: A molecule is a group of two or more atoms joined together by a bond, whereas a compound is
a substance made up of at least two different types of atoms chemically bonded together.
3. What is the term for two or more substances that are mixed together but are not joined by chemical
bonds?
Answer: A mixture is a combination of two or more substances that are not chemically bonded together.
4. What do chemical symbols represent on the periodic table, and what do they tell us about each
element?
Answer: Chemical symbols are letters that represent each element on the periodic table, providing
information about its identity and properties.
5. What does a chemical formula reveal about a molecule or compound?
, Answer: A chemical formula shows the collection of chemical symbols and the number of each element
present in a molecule or compound.
6. What makes up the center part of an atom, and what are its properties?
Answer: The nucleus is the central part of an atom, composed of protons and neutrons, which have
mass and charge.
7. What are protons, neutrons, and electrons in terms of their properties and roles in an atom?
Answer: Protons have a mass of 1 and a charge of +1, neutrons have a mass of 1 and a charge of 0, while
electrons have almost no mass and a charge of -1.
8. What happens to an atom when it gains or loses electrons, and what is the resulting particle called?
Answer: When an atom gains or loses electrons, it becomes an ion - positively charged if it loses
electrons or negatively charged if it gains them.
9. What is the rule that states that matter cannot be created or destroyed during a chemical reaction?
Answer: The conservation of mass states that the total amount of matter remains constant before and
after a chemical reaction.
10. How do chemical equations represent chemical reactions, and what makes an equation balanced?
Answer: Chemical equations use chemical symbols and formulae to show what happens in a reaction,
with balanced equations ensuring that the same number of each type of atom appears on both sides.
11. What does the atomic number represent in an element's symbol, and what does it relate to?
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