30
I
n
d
e
x
acid rain 23
acids 16, 17, 19, 20–23, 25, 28, 29
alkalis 17, 18, 19, 28
baking soda 12, 13, 14, 17, 18,
19, 29
balloon 12, 13
batteries 24–27, 28, 29
bone 23, 28
bubbles 13, 14
calcium 22, 23, 28
calcium carbonate 22, 23, 28
carbon 11, 28, 29
carbon dioxide 13, 14, 22, 28
coins 20
copper 20, 24, 25, 26, 27, 28
copper oxide 20, 28
eggshell 22, 23, 28
electricity 24–27, 28, 29
electrodes 25, 28
erosion 23
growing a lemon tree 8–9
invisible ink 10–11
lemon drops 15
lemon seeds 7, 8–9
lemonade 14, 15
litmus paper 16–19, 29
milk 21
nutrients 9, 28
sour 7, 16, 21
zinc 25, 26, 29
