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What is an atom?
The smallest particle which makes up everything
What is an element?
Made from only 1 type of atom
What is a compound?
Two or more elements chemically combined
How do we know if a chemical reaction has taken place?
Colour change, light given off, temperature change, bubbles, gas produced
What is the charge of a proton?
Positive +1
What is the charge of an electron?
Negative -1
What is the charge of a neutron?
Neutral 0
What does the atomic (bottom) number tell us?
Number of protons/electrons
What does the mass (top) number tell us?
Protons + Neutrons
How many electrons can go in the first shell?
2
How many electrons can go in the second shell?
8
What does the group number tell us?
Number of electrons in the outer shell
What does the period number tell us?
Number of shells
What is conservation of mass?
Mass of reactants = mass of products
What is the test for hydrogen gas?
Lit splint- squeaky pop
What is the test for oxygen gas?
Glowing splint - relights
