Chemistry

• Matter is objects that you can see, takes up space, and has mass
• An atom is the smallest particle of a chemical element that can exist.
• Matter is objects that you can see, takes up space, and has mass
• What subatomic particles are in the nucleus of an atom?

  Protons, Neutrons, Electron
• What subatomic particle sits in the shells of an atom?

  Electron
• Proton is a positive charge
• Neutron is a neutral charge
• Electron is a negative charge
• What is the atomic number?

  The number of protons in an atom
• On the periodic table, the atomic number is on the top left corner.
• When writing a nuclide representation, the atomic number is on the bottom left corner.
• An atom neutral is when number of electrons is equal to number of protons
• The first electron shell can hold 2 atoms
• The second electron shell can hold 8 atoms
• The third electron shell can hold 8 atoms
• The fourth electron shell can hold 32 atoms
• The first shell is closest to the nucleus of an atom
• Whats in a nucleus?

  Protons and neutrons
• What's the term for the short way to express an element?

  Nuclide representation
• On the periodic table, the mass number is at the bottom
• When writing nuclide representation, the mass number is at the top left
• What is the mass number?

  Number of protons + number of neutrons
• The number of electrons is equal to number of protons because (in year eight) all elements are neutral.
• How do you find the number of neutrons in an atom?

  Mass number - atomic number
• What are the features of metals?

  Lustrous, solid at room temperature, malleable, ductile, good electrical / heat conductor
• What are the features of non-metal?

  Dull, gas or solid at room temperature, brittle, poor electrical / heat conductor
• What is an element?

  A substance made up of one type of atom
• What is chemical bonding?

  When elements join together and are very hard to separate
• What is a molecule?

  A combination of two or more atoms that are chemically bonded together
• What is an elemental molecule?

  Two or more of the same types of atoms chemically bonded together
• What is a compound molecule?

  Two or more different types of atoms chemically bonded together
• What is a mixture?

  Two or more different substances that are not chemically bonded together.
• What is physical change?

  When no new substance is produced
• What is classified as physical change?

  Change in shape or size, Change in state of matter, mixing, dissolving
• What is chemical change/reaction?

  When there's a rearrangement of atoms
• Evidence of a chemical change/reaction include?

  Change in colour, precipitation, gas is produced, energy is produced
• What is the Law of Conservation of Mass?

  The elements present at the start will also be present at the end.
• What are reactants?

  The starting elements
• What are products?

  The result of the reactants
• What does aqueous mean?

  Something dissolved in water, keywords: solution, acid