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Kruka [31]
3 years ago
9

Chemical reactions occur when molecules or atoms collide so that the bonds between atoms break and new bonds form. breaking the

bonds of the reactants requires energy; whereas, bond formation releases energy. select the statements regarding energy changes during a reaction that are true.
Chemistry
1 answer:
katen-ka-za [31]3 years ago
8 0
If two substances react and the temperature of the mixture decreases, the reaction is endothermic<span>. If two substances react and the temperature of the mixture increases, the reaction is </span>exothermic<span>. A chemical reaction involves the </span>breaking<span> of bonds in the reactants and the forming of bonds in the products.</span>
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Alika [10]

Answer:

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4 0
2 years ago
Steve and Meg are doing an experiment where they need to make 37 grams of Fe2O3. How many grams of Fe would they need ?
Anna11 [10]

Answer:

25.9g

Explanation:

Molecular mass of Fe₂O₃ = (56 * 2) + (16 * 3)

                                          = 112 + 48 = 160

Let's follow the unitary method now

In 160g Fe₂O₃ , there is 112 g Fe

In 1 g  Fe₂O₃ , there is 112 / 160 g Fe

In 37  Fe₂O₃ , we need 112 * 37 / 160

= 25.9 g Fe

5 0
2 years ago
Which set of characteristics accurately describes the physical properties of electrons in atoms
zloy xaker [14]

Answer: Option (A) is the correct answer.

Explanation:

When there occurs no change in the chemical composition of a substance then it is known as physical property.

For example, mass, volume, density are all physical properties.

Since, the mass of an electron is negligible and an electron holds a negative charge.

Therefore, negatively charged particle with very little mass accurately describes the physical properties of electrons in atoms.

7 0
2 years ago
A solution with a ph of 6 has ________ times _________ oh- than a solution with a ph of 10.
Mila [183]
Answer would be... has  10 x^{-6- (-10)}= 10 x^{4} times concentration OH-
3 0
3 years ago
Which formula equation represents the burning of sulfur to produce sulfur dioxide?
Firlakuza [10]

Balanced chemical equation: S(s) + O₂(g) → SO₂(g).

Sulfur change oxidation number from 0 to +4 (oxidation) and oxygen change oxidation number from 0 to -2 (reduction).

Sulfur dioxide (SO₂) is very common volcanic gas.

Fossil fuel combustion increases the acidity of rain because the sulfur dioxide is produced.  

Because of fuel combustion, sulfur dioxide goes up into the atmosphere as the hot gases rise, than it reacts with water and oxygen in the air and form sulfuric acid.

6 0
3 years ago
Read 2 more answers
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