Answer:
It's <em>HYDROXIDE</em><em> </em>
Explanation:
You do not call it as hydroxide <em>ion</em><em> </em>because ion always have + or -
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Answer:
A machine have 75% efficiency means 25% of efficiency has been lost due to friction and a machine can work 75% only.
4, 2, 1, and 3 is the answer
Quartz is a substance because the material has uniform properties throughout and is held together via chemical bonds.