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gladu [14]
3 years ago
5

Which statement is true?

Chemistry
2 answers:
marin [14]3 years ago
8 0

your answer is c because rocks are NOT ALL THE TIME MADE WITH JUST ONE MINERAL

mihalych1998 [28]3 years ago
3 0
B. Most rocks are composed of single mineral
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Calcium carbonate can break down to form calcium oxide and carbon dioxide.
DerKrebs [107]

Answer:

The answer to your question is the third choice.

Explanation:

                        CaCO₃  ⇒   CaO  +  CO₂

Check if the reaction is balanced or unbalanced

                  Reactants       Elements         Products

                           1              Calcium                1

                           1               Carbon                 1

                           3              Oxygen                3

As the number of atoms in the reactant is the same that the number of atoms in the products we conclude that the reaction is balanced.

So the correct answer is balanced because the total number of oxygen atoms is 3.

4 0
3 years ago
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3. The picture below is an example of a _________ _________. (Answer is 2 words)
Jlenok [28]

Answer:

I can't see any picture?????

8 0
3 years ago
For the following reaction: Fe2O3 + 3CO --> 2Fe + 3CO2 how many grams of Fe2O3 is needed to produce 111 g of Fe?
Afina-wow [57]
You need 158.70 grams of Fe2O3 to produce 111 grams of Fe. This is calculated by using the molar masses and stoichiometric relationship of the two compounds.

Solution:

MM Fe = 55.845 g/mol
MM Fe2O3 = 159.69 g/mol
Fe: Fe2O3 = 2 mol:1 mol

11 g FE (1 mol Fe/55.845 g Fe) (1 mol Fe2O3/2 mol Fe) (159.69 g Fe2O3 / 1 mole Fe2O3) = 158.70 grams Fe2O3
4 0
3 years ago
How does helium form (5-8) sentences
Firlakuza [10]
On Earth it is relatively rare—5.2 ppm by volume in the atmosphere. Most terrestrial helium<span> present today is created by the natural radioactive decay of heavy radioactive elements (thorium and uranium, although there are other examples), as the alpha particles emitted by such decays consist of </span>helium<span>-4 nuclei.</span>
7 0
3 years ago
Convert the volume 27.8 L to the unit m3.
kolbaska11 [484]

Answer:

0.0278 cubic meters

Explanation:

hoped I helped

4 0
3 years ago
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