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slega [8]
3 years ago
10

15 POINTS!!!!!!

Chemistry
2 answers:
valentina_108 [34]3 years ago
6 0

Important discoveries from  Lavoisier who changed the field of chemistry in the late 1700s

  • 1. periodic system
  • 2. the discovery of oxygen
  • 3. the law of conservation of mass
  • 4. the importance of weighing
<h3><em>Further explanation</em></h3>

There are several important discoveries from Antoine Laurent Lavoisier who changed the field of chemistry in the late 1700s

The findings include:

  • 1. he discovered the naming of the chemical periodic system for the first time on which the naming of the modern periodic system was based
  • 2. He put forward the term "oxygen" and stated that air consists of two components namely nitrogen and oxygen.
  • And oxygen is what plays an important role in the combustion process of a substance
  • 3. He stated the law of conservation of mass.

Experiments carried out by reacting oxygen and mercury in a closed system and produce mercury oxide

And if it is heated it will again produce the same amount of oxygen and mercury

From this experiment, he stated the law that:

In a closed system, the total mass of the substance before the reaction will be equal to the total mass of the reaction product.

  • 4. Lavoisier's precision in the importance of the weighing process in chemical reactions causes an important basis in the calculation of chemistry for the progress of research in the future

<h3><em>Learn more</em></h3>

Law of conservation of mass https://brainly.in/question/4830694

application of mass conservation law brainly.com/question/6677869

the law of conservation of matter

brainly.com/question/12733091

Keywords: mass, closed system, Lavoisier, combustion, periodic system

pickupchik [31]3 years ago
4 0
He proposed the Law of Conservation of Matter, being the first to say that matter can not be created nor destroyed.
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8.3 miles of sodium chloride in 0.65 of water.
Allisa [31]

Answer:

12.77 M

Explanation:

8.3 moles of NaCl in .65 L of water ?    Looking for M ?

8.3 M / .65 L  =  12.77 M

4 0
2 years ago
Which of the following will have the slowest rate of diffusion at a given temperature?
marysya [2.9K]
<h3>Answer:</h3>

Chlorine gas (Cl₂)

<h3>Explanation:</h3>
  • According to the Graham's law of diffusion, the diffusion rate of a gas is inversely proportional to the square root of its density or molar mass.
  • Therefore, a lighter gas will diffuse faster at a given temperature compared to a heavy gas.
  • Consequently, the heavier a gas is then the denser it is and the slower it diffuses at a given temperature and vice versa.

In this case we are given gases, CI₂

, H₂,He and Ne.

  • We are required to identify the gas that will diffuse at the slowest rate.
  • In other words we are required to determine the heaviest gas.

Looking at the molar mass of the gases given;

Cl₂- 70.91 g/mol

H₂- 2.02 g/mol

He - 4.00 g/mol

Ne- 20.18 g/mol

Therefore, chlorine gas is the heaviest and thus will diffuse at the slowest rate among the choices given.

8 0
3 years ago
Where is the most of the mass of an atom located?
kow [346]
<span>The mass of an atom located in the A) nucleus.</span>
4 0
3 years ago
Suppose you wanted to cause Pb2+ ions to come out of solution as solid Pb. Which metal(s) could you use to accomplish this? Au Z
lions [1.4K]

Answer:

Ca, Zn, Ni, Al, Fe

Explanation:

The activity series is an arrangement of metals in order of decreasing reactivity.

Metals that are high up in the activity series are very reactive. They displace metals that are lower in the activity series from an aqueous solution of their salts.

The metals; Ca, Zn, Ni, Al, Fe are all above Pb in the activity series hence they will cause Pb2+ ions to come out of solution as solid Pb.

5 0
3 years ago
How many molecules are in 71.3 moles of H2O
Svetradugi [14.3K]
H2O molar mass= 18.02
Use Avogadro’s constant to convert moles into particles.
71.3x6.02x10^23=429.229
There are 429.229 molecules in 71.3 moles of H2O
4 0
3 years ago
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