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Sonbull [250]
3 years ago
12

Lavoisier made an important contribution to chemistry by _____.

Chemistry
1 answer:
Harlamova29_29 [7]3 years ago
6 0

Answer:

Lavoisier made an important contribution to chemistry by the law of conservation of mass

Explanation:

The law of conservation of mass tell us, that the mass doens't change in a system. You have the same mass at the begining and in the end of a reaction.

Matter is neither created, nor destroyed in a chemical reaction.

This law also states that mass of reactants is the same of products in any chemical reaction

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The formation of protons over neutrons (thus producing about a 7:1 ratio) was favored in the early universe because:____.
tatiyna

Because it requires more energy to create a neutron from a proton than it does to create a proton from a neutron, protons were formed more frequently than neutrons in the early universe. The correct answer is option b.

To find the answer, we need to know more about the early universe.

<h3>How the formation of proton over neutrons was favored in the early universe?</h3>
  • A neutron is produced with greater energy than a proton.
  • However, later on, some of the protons were changed into neutrons.
  • Contrary to some claims, the proton is a stable particle that never decays, but the neutron is unstable outside of the nucleus and decays with a half life of around 10.5 minutes.
  • However, very few would have had time to decay on the timeline you mention in your question.
  • Every matter particle should have been accompanied by an antimatter particle, and every proton, neutron, and electron, by an anti-neutron and a positron, respectively.
  • Where did all the antimatter go is the great mystery. There have been a few attempts to explain this, but they have failed.

Thus, we can conclude that, the correct answer is option b.

Learn more about the early universe here:

brainly.com/question/28130096

#SPJ1

7 0
2 years ago
3 H2S + 2 HNO3 +35 + 2 NO + 4 H2O
Anettt [7]

Element Oxidized: S (S^(2-) --> S⁰)

Element Reduced: N (N^(5+) --> N(2+))

Oxidizing Agent: HNO3

Reducing Agent: H2S

3 0
3 years ago
The thiocyanate polyatomic ion, SCN-, is commanly called a pseudohalogen because it acts very much like halide ions. For example
harina [27]

Answer:

A) \frac{1mol(SCN)_{2}}{2molNaSCN}

B) 0.025 mol (SCN)₂

C) 2 mol (SCN)₂

D) \frac{1molMnSO_{4}}{2molH_{2}SO_{4}}

E) 3.5504 mol H₂SO₄

Explanation:

2NaSCN +2H₂SO₄ + MnO₂ → (SCN)₂ + 2H₂O + MnSO₄ + Na₂SO₄

A) A conversion factor could be \frac{1mol(SCN)_{2}}{2molNaSCN} , as it has the units that we want to <u>convert to in the numerator</u>, and the units that we want to <u>convert from in the denominator</u>.

B) 0.05 mol NaSCN *  \frac{1mol(SCN)_{2}}{2molNaSCN} = 0.025 mol (SCN)₂

C) With 4 moles of NaSCN and 3 moles of MnSO₄, the<em> reactant </em>is NaSCN so we use that value to calculate the moles of product formed:

4 mol NaSCN * \frac{1mol(SCN)_{2}}{2molNaSCN} = 2 mol (SCN)₂

D) \frac{1molMnSO_{4}}{2molH_{2}SO_{4}}

E) 1.7752 mol MnSO₄ * \frac{2molH_{2}SO_{4}}{1molMnSO_{4}} = 3.5504 mol H₂SO₄

5 0
3 years ago
An ideal monatomic gas at 300 K expands adiabatically to twice its initial volume. Assume that the process is also quasistatic.
kondor19780726 [428]

Answer:

600k

Explanation:

In this problem, we need to use a gas law that relates temperature to volume. The gas law to use here is the Charles’ law.

The Charles’ law posits that temperature and volume are directly proportional, provided that the pressure is kept constant.

Mathematically:

V1/T1 = V2/T2

We are looking at getting V2, hence we can write the mathematical equation as:

T2 = V2T1/V1

Asides the fact that we know that the gas is monoatomic, we do not know its volume. Let its initial volume be v. Since it expanded adiabatically, this means that its new volume is 2v

Hence: V1 = v , V2 = 2v , T1 = 300k and T2 is ?

Substituting these values, we have the following:

T2 = (2v * 300)/v

T2 = 600k

6 0
3 years ago
What are living things
OLga [1]
Animals, plants, Humans

Hope this can help you!
3 0
4 years ago
Read 2 more answers
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