acids have an equally strong alkali which evens them out the pH scale goes up 14 getting dark if you have a coloured pH scale pH scale measures how high the pH is if you take indigestion tablets the have and alkali which evens out the acid making you have indigestion
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chemical and physical changes
chemical changes are irreversible physical changes are reversible changes so if i fry an egg it is a chemical change but melting butter is a physical change as you can get it back if you cool it down
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cells
neclues controls the cell
cell membrane controls what goes in and out
cell wall
chloroplast helps with photosynthesis
cytoplasm is where chemical reactions take place
cilia cells move dirt through the throat
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weathering
If a rock has eroded it has been weathered by either physical, biological or chemical. Physical weathering is when the air in side the rocks heat up in the day and then get really cold in the night this expands the rock so eventually parts of the rock fall off in chunks. Biological weathering is caused by animals feeding and plant seeds falling and growing in the cracks of the rocks. Chemical weathering is caused by acid rain that falls natually and normal rain that falls in the cracks of the rocks.
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