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April 25, 2015

Homework Help: 8th Grade Science

Posted by Gabby on Saturday, October 12, 2013 at 1:58pm.

1) Which of the following is a chemical change? (1 point)
Boiling of water***
Melting a cube of ice
Dissolving 10 grams of salt in water
Splitting water into hydrogen and oxygen

2) What is the mass of water that results from combining 2.0g of hydrogen with 16.0g of oxygen? (1 point)
14.0g
16.0g
18.0g***
20.0g

3) Why are plastic building blocks good for modeling molecules? (1 point)
They come in thousands of shapes and sizes.***
They can be combined in many different ways.
They are rigid and do not easily separate.
There are as many different colors as there are atoms.


Correct?


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