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Novosadov [1.4K]
3 years ago
13

When water decomposes into oxygen and hydrogen, the mass

Chemistry
1 answer:
Maurinko [17]3 years ago
8 0
<span>When water decomposes into oxygen and hydrogen, the mass "Remains Constant" as according to Law of Conservation of mass, mass can neither be created not destroyed,.

In short, Your Answer would be Option A

Hope this helps!</span>
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5. Geologists think that the inner and outer cores of Earth consist of<br> iron and nickel.
wolverine [178]

Answer:

is this true/false? if so its true.

Explanation:

3 0
2 years ago
A group 2 metal carbonate has a mass of 84 g/mol. Identify the group 2 metal X using its chemical formula.
zepelin [54]

Answer:

Magnesium

0.003mole

Explanation:

The problem here entails we find the metal in the carbonate.

 For group 2 member, let the metal  = X;

 The carbonate is XCO₃;

 If we sum the atomic mass of the elements in the metal carbonate, we should arrive at 84g/mol

 Atomic mass of C = 12g/mol

                            O  = 16g/mol

 Atomic mass of X + 12 + 3(16)  = 84

  Atomic mass of X  = 84 - 60  = 24g/mol

The element with atomic mass of 24g is Magnesium

B.

Number of moles in 0.3g of CaCO₃:

     Molar mass of CaCO₃   = 40 + 12 + 3(16)  = 100g/mol

 Number of moles = \frac{mass}{molar mass}  

 Number of moles  = \frac{0.3}{100}   = 0.003mole

7 0
3 years ago
Someone help answer this
alexandr402 [8]

it is water energy :) this is easy

6 0
3 years ago
Read 2 more answers
Use this diagram to answer the following
mylen [45]

Answer:An atom

Explanation:

Because  molecules more spread out and have things that connnect them and are not bunched up togoether

And Atoms are all packed up like in the picture

Hope this helps!:D

4 0
2 years ago
The element nickel has the following properties. Select the two that are chemical properties of nickel.
kkurt [141]
<span>a. It melts at 1455oC I know this is correct I need One more</span>
5 0
3 years ago
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