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dexar [7]
3 years ago
10

Fluorin is often added to drinking water and toothpaste

Chemistry
2 answers:
Svetradugi [14.3K]3 years ago
4 0
This is true i think if that is a question
liq [111]3 years ago
4 0
This false. The correct answer is fluoride.
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What motion causes thermal energy?
OLga [1]
Thermal energy causes of motion of

1. mixing water molecules contained in a beaker.

2.<span>molecules in soild liquid and gas phases 

3. mixing </span><span>molecules together 

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7 0
3 years ago
How many moles of ethane (C2H6) would be needed to react with 62.3 grams of oxygen gas?
Vladimir [108]
Note that it says oxygen "gas"
So you need the atomic mass of oxygen gas

Look at your periodic table, you'll see 15.9994 under oxygen
Oxygen gas has a formula of O2 therefore,
(15.9994) times 2= Oxygen gas atomic mass=31.9988

Mol= Mass/Atomic Mass
=62.3 g/ 31.9988 g/mol = 1.95 mol

now look at the ratio of C2H6 and O2, notice there is an invisible number beside each of them, at that "invisible number" is =1

1 C2H6 + 1 O2 -> products

this means that for 1 mol of C2H6, 1 mol of O2 has to react with it

Thus as we have 1.95 moles of O2, we need 1.95 moles of C2H6
5 0
3 years ago
Idenatify the pair in which the formula does not match the name
MissTica
What're the options?

3 0
3 years ago
It is found that the new element contains 74 protons and 110 neutrons. What is the atomic number of the element
jarptica [38.1K]

Answer:

74

Explanation:

we know,

atomic number = number of protons

so,

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6 0
3 years ago
Read 2 more answers
What is the oxidation number of s in na2s4o6?
Novosadov [1.4K]

Answer:

+2.5

Explanation:

So the oxidation number of S in Na2S4O6is +2.5.

7 0
3 years ago
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