All categories

3 years ago

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.

You might be interested in

26 Milkweed contains a poison known as cardenolides. Monarch butterflies eat the milkweed plant and hold on to this toxic compou

Amanda [17]

Cardenolides, with the chemical formula CH₁₈C₂₀H₁₅CHCO₂ have (D) 23 carbon atoms, 34 hydrogen atoms, and 2 oxygen atoms.

Milkweed contains a poison known as cardenolides. The chemical formula for cardenolides CH₁₈C₂₀H₁₅CHCO₂.

The subscripts in the formula represent the atomicities, that is the number of atoms of each element in each part of the formula.

We can calculate the total number of atoms of each element by adding its atomicities.

<h3>Carbon atoms</h3>

$C = 1 + 20 + 1 + 1 = 23$

<h3>Hydrogen atoms</h3>

$H = 18 + 15 + 1 = 34$

<h3>Oxygen atoms</h3>

$O = 2$

Cardenolides, with the chemical formula CH₁₈C₂₀H₁₅CHCO₂ have (D) 23 carbon atoms, 34 hydrogen atoms, and 2 oxygen atoms

Learn more: brainly.com/question/13348838

5 0

3 years ago

Nitrogen dioxide is a red-brown gas responsible for the brown color of smog. A container of nitrogen dioxide that is at low pres

____ [38]

Answer:

Initially $1.51\times 10^{-2} moles$ of nitrogen dioxide were in the container .

Explanation:

Volume of the container at low pressure and at room temperature = $V_1=3.4 L$

Number of moles in the container = $n_1$

After more addition of nitrogen gas at the same pressure and temperature.

Volume of the container after addition = $V_2=5.11 L$

Number of moles in the container after addition= $n_2=2.28\times 10^{-2} mol$

Applying Avogadro's law:

$\frac{Volume}{Moles}=constant$ (at constant pressure and temperature)

$\frac{V_1}{n_1}=\frac{V_2}{n_2}$

$n_1=\frac{V_1\times n_2}{V_2}=\frac{3.4 L\times 2.28\times 10^{-2} mol}{5.11 L}$

$n_1=1.51\times 10^{-2} mol$

Initially $1.51\times 10^{-2} moles$ of nitrogen dioxide were in the container .

8 0

3 years ago

What are three ways in which a metal is different to a non-metal?

elena-14-01-66 [18.8K]

Answer:

1)non.metals gain electron but metals lose electron.

2)metals are good conductor of heat and electricity but non.meatals are bad conductor of heat and electricity.

3)most of metals are shiny but non .metals are not.

4 0

3 years ago

Read 2 more answers

What kind of energy is required for photosynthesis to occur

Makovka662 [10]

Answer:

light energy to convert carbon dioxide and water into glucose and oxygen gas. Each molecule of glucose essentially “stores” up to 38 molecules of ATP which can be broken down and used during other cellular reactions.

Explanation:

6 0

3 years ago

Read 2 more answers

An unknown substance is obtained by police. The forensics laboratory has

timurjin [86]

Answer:

70.0 %

Explanation:

Step 1: Given data

Mass of nitrogen (mN): 74.66 g

Mass of the compound (mNxOy): 250 g

Step 2: Calculate the mass of oxygen (mO) in the compound

The mass of the compound is equal to the sum of the masses of the elements that form it.

mNxOy = mN + mO

mO = mNxOy - mN

mO = 250 g - 74.66 g = 175 g

Step 3: Determine the percent composition of oxygen in the sample

We will use the following expression.

%O = mO / mNxOy × 100%

%O = 175 g / 250 g × 100% = 70.0 %

5 0

2 years ago