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Y8 Chemical Reactions
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Is a self-heating can endothermic or exothermic?
exothermic
Is a handwarmer endothermic or exothermic?
Exothermic
Is a sports injury pack endothermic or exothermic?
Endothermic
What is an endothermic reaction?
Energy enters
What is an exothermic reaction?
Energy exits
Why is carbon monoxide dangerous?
Toxic gas which is odourless/colourless
If there is not enough oxygen for complete combustion, what gas is formed instead?
Carbon monoxide
What is combustion?
Burning
What is the test for chlorine gas?
Damp litmus paper - bleaches
What is the test for carbon dioxide gas?
Bubble through limewater - turns cloudy
What is the test for oxygen gas?
Glowing splint - relights
What is the test for hydrogen gas?
Lit splint- squeaky pop
What is conservation of mass?
Mass of reactants = mass of products
What does the period number tell us?
Number of shells
What does the group number tell us?
Number of electrons in the outer shell
How many electrons can go in the second shell?
8
How many electrons can go in the first shell?
2
What does the mass (top) number tell us?
Protons + Neutrons
What does the atomic (bottom) number tell us?
Number of protons/electrons
What is the charge of a neutron?
Neutral 0
What is the charge of an electron?
Negative -1
What is the charge of a proton?
Positive +1
How do we know if a chemical reaction has taken place?
Colour change, light given off, temperature change, bubbles, gas produced
What is a compound?
Two or more elements chemically combined
What is an element?
Made from only 1 type of atom
What is an atom?
The smallest particle which makes up everything
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