How is friction a good thing and a bad thing?

1 answer:

6 0

1. It stops objects from sliding endlessly.
2. It's the reason why we're able to walk

Bad:
1. Decreases efficiency since some energy is wasted and turns to heat
2. Damages equipment/objects like when you slide it on the floor

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According to the pattern of carbon and hydrogen atoms in alkenes, if a molecule has three carbon atoms, how many hydrogen atoms

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<span>6.

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2 NaCL + CaO = CaCL2 + Na2O

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222 grams of calcium chloride is produced.

<h3><u>Explanation</u>:</h3>

The mole concept and the chemical equation are very much closely related with each other. In the chemical reaction, the compounds or elements in both sides are balanced according to the number of atoms of each side of the reaction. So from there we can easily find the amount of reactant reacts to produce desired product.

Here we can see that 2 moles of sodium chloride produces 1 mole of calcium chloride.

So, 4 moles of sodium chloride will produce 2 moles of calcium chloride.

Now, atomic weight of calcium =40.

Atomic weight of chlorine =35.5.

So,the molecular weight of calcium chloride = $40+ 35.5\times2$

=111.

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