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Norma-Jean [14]
3 years ago
12

The mass number of an atom is the sum of the atomic number and the number of..

Chemistry
1 answer:
Len [333]3 years ago
8 0
The answer here is neutrons
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Mercury is a liquid meteal but it is not hard? how can we say it is a metal
NNADVOKAT [17]
What's the problem ? Hardness is not the definition of a metal. You need to expand your thinking. EVERY element is solid, liquid, and gas, over different ranges of temperature ... including all of the metals. There are only TWO elements that are liquid AT ROOM TEMPERATURE, and mercury is one of them. But on a mild day at the south pole, mercury is solid too.
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Describe the particles in each state of matter <br><br> Solid:<br> Liquid: <br> Gas:
vichka [17]

Answer:

Solíd= vibrating

liquid= moving slowly

gas= moving faster

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3 years ago
Which of the following is an example of a compound?
VladimirAG [237]

Answer:

H2O is a compound because its a main constitute of earths hydrosphere

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2 years ago
A sulfur ion has 16 protons and 18 electrons. Find the net charge
andrezito [222]

I think its 2-, it gained 2 electrons.

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3 years ago
Given the equation: 2H2 + O2 → 2H2O, how many moles of oxygen are needed to react with 13 moles of hydrogen
bulgar [2K]

Explanation:

2H2 + O2 = 2H2O

2mol. 1mol. 2mol

2mol reacts with 1mol

13mol reacts with x

x=<u>13mol</u><u> </u><u>×</u><u> </u><u>1mol</u>

<u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u>2mol</u>

x= <u>13mol</u>

<u> </u><u> </u><u> </u><u> </u><u> </u><u> </u>2mol

x= 6.5mol of oxygen

6 0
2 years ago
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