CHEMISTRY C1 1

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CHEMISTRY AQA

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Question Answer
What are elements made of? Atoms
How many types of atom does an element contain? One
How many types of atom does a compound contain? Two or more
What is the basic structure of an atom? An atom has a tiny nucleus in its centre surrounded by electrons
What are atoms made of? Protons, neutrons and electrons
What kind of charge does an electron have? Negative
What kind of electric charge does a neutron have? No charge, they're neutral
What kind of electric charge do protons have? Positive
What is an atomic number? The number of Protons OR Electrons
What is a mass number? The number of Protons + Neutrons
How are atoms arranged in the periodic table? In order of their atomic number
How are electrons arranged in an atom? In energy levels or shells
What determines the way an element reacts? The number of electrons in its outermost shell
Why are the atoms of Group 0 elements so unreative? They have full outer shells, making them stable
What does the formula of a compound show? The number and types of different atoms bonded together to make that compound.
What is formed when a metal reacts with a non metal? Ions
What happens in ionic bonding? Metal atoms form positively charged ions and non-metals form negatively charged ions. These oppositely charged ions are attracted to each other in ionic bonding.
What is covalent bonding? Atoms of non-metals reacting by sharing electrons.
Can we create new atoms? No, atoms cannot be created or destroyed.
What is a balanced equation? An equation with equal numbers of each type of atom on both sides of the arrow.
How is the total mass of reactants related to the total mass of the product? They are always equal, atoms cannot be lost during a reaction.