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2 years ago

15 POINTS!!!!!!

Chemistry

2 answers:

valentina_108 [34]2 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]2 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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steposvetlana [31]

Answer:

Imagine that you are a farmer in ancient Egypt. You must carefully plan around the flooding of the Nile in order to raise your crops.

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1 The floodwater recedes and you plant your crops.

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The Nile Valley is flooded again.

The hot season begins, and the Nile begins to dry up.

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Explanation:

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2 years ago

How many atoms make up a diatomic molecule?

zalisa [80]

The prefix 'di' means two. Hence two atoms make up a diatomic molecule.
Hope this helps!

6 0

2 years ago

sineoko [7]

Answer:

3. V = 0.2673 L

4. V = 2.4314 L

5. V = 0.262 L

6. V = 2.224 L

Explanation:

3. assuming ideal gas:

PV = RTn

∴ R = 0.082 atm.L/K.mol

∴ V1 = 225 L

∴ T1 = 175 K

∴ P1 = 150 KPa = 1.48038 atm

⇒ n = RT/PV

⇒ n = ((0.082 atm.L/K.mol)(175 K))/((1.48038 atm)(225 L))

⇒ n = 0.043 mol

∴ T2 = 112 K

∴ P2 = P1 = 150 KPa = 1.48038 atm

⇒ V2 = RT2n/P2

⇒ V2 = ((0.082 atm.L/K.mol)(112 K)(0.043 mol))/(1.48038 atm)

⇒ V2 = 0.2673 L

4. gas is heated at a constant pressure

∴ T1 = 180 K

∴ P = 1 atm

∴ V1 = 44.8 L

⇒ n = RT/PV

⇒ n = ((0.082 atm.L/K.mol)(180 K))/((1 atm)(44.8 L))

⇒ n = 0.3295 mol

∴ T2 = 90 K

⇒ V2 = RT2n/P

⇒ V2 = ((0.082 atm.L/K.mol)(90 K)(0.3295 mol))/(1 atm)

⇒ V2 = 2.4314 L

5. V1 = 200 L

∴ P1 = 50 KPa = 0.4935 atm

∴ T1 = 271 K

⇒ n = RT/PV

⇒ n = ((0.082 atm.L/K.mol)(271 K))/((0.4935 atm)(200 L))

⇒ n = 0.2251 mol

∴ P2 = 100 Kpa = 0.9869 atm

∴ T2 = 14 K

⇒ V2 = RT2n/P2

⇒ V2 = ((0.082 atm.L/K.mol)(14 K)(0.2251 mol))/(0.9869 atm)

⇒ V2 = 0.262 L

6.a) ∴ V1 = 24.6 L

∴ P1 = 10 atm

∴ T1 = 25°C = 298 K

⇒ n = RT/PV

⇒ n = ((0.082 atm.L/K.mol)(298 K))/((10 atm)(24.6 L))

⇒ n = 0.0993 mol

∴ T2 = 273 K

∴ P2 = 101.3 KPa = 0.9997 atm

⇒ V2 = RT2n/P2

⇒ V2 = ((0.082 atm.L/K.mol)(273 K)(0.0993 mol))/(0.9997 atm)

⇒ V2 = 2.224 L

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2 years ago

True or False: Photosynthesis can happen anytime, regardless of the amount of reactants present or the presence of sunlight.

Arisa [49]

The answer is false .

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2 years ago

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Write down five things that you personally could do in your day-to-day life to help with the problem of climate change. Write do

beks73 [17]

Before that, we need to know what causes climate change. One of the main reasons are the carbon dioxide released into the atmosphere, it traps heat but allow more heat to enter the earth, therefore climate increases over the years.

1. Set air conditioner to a higher temperature (eg. 25°C) or turn on fans instead.
Operating AC can use a lot of energy, and these energy is produced by burning if fossil fuels which releases carbon dioxide.

2. Take public transports instead of cars. The more private cars there are, the more pollutants it release, these pollutants includes carbon dioxide.

3. Turn off all the lights / electrical appliances when we leave a place. Again, electrical appliances require energy which is produced by burning of fossil fuels that gives out carbon dioxide.

4. Recycle and reuse paper that is only used on one side. Papers are extracted from trees and one main function of trees is to absorb carbon dioxide from the air. If many trees are cut, the amount of carbon dioxide in air would increase.

5. Do the laundry only if you have clothes full for the machine. If the washing machine is not full and you're starting it up, it really uses a lot of energy and water, which all again it triggers the release of carbon dioxide.

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3 years ago