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3 years ago

WILL MARK BRAINLIEST !! HELP ASAP

Chemistry

2 answers:

andre [41]3 years ago

6 0

I am almost positive that the answer is D

ra1l [238]3 years ago

6 0

Answer : The correct option is, (B) Cellular respiration in humans

Explanation :

Combustion reaction : It is defined as the hydrocarbon react with the oxygen then it react to give carbon dioxide and water as a product.

A. Photosynthesis in plants

Photosynthesis : It is a chemical process or a reaction which takes place in the green plants or the living organisms.

During this process, the carbon dioxide reacts with the water in the presence of sunlight to gives glucose and oxygen as a product.

The balanced chemical reaction will be,

$6CO_2+6H_2O\overset{sunlight}\rightarrow C_6H_{12}O_6+6O_2$

B. Cellular respiration in humans

Cellular respiration : In this process, the hydrocarbon react with the oxygen to give carbon dioxide and water as a product. This reaction is a combustion reaction.

Cellular respiration is directly opposite of photosynthesis.

The balanced chemical reaction will be,

$C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O$

C. Mixing of vinegar and baking soda

When vinegar is react with baking soda then it gives sodium acetate, carbon dioxide and water as a product. This reaction is an acid-base reaction.

The balanced chemical reaction will be,

$CH_3COOH+NaHCO_3\rightarrow CH_3COONa+H_2O+CO_2$

D. Release of carbon dioxide on heating limestone

When limestone (calcium carbonate) is heated then it decomposes to give calcium oxide and carbon dioxide as a product. This reaction is a decomposition reaction.

The balanced chemical reaction will be,

$CaCO_3\rightarrow CaO+CO_2$

Hence, from this we conclude that the example of combustion reaction is, (B) Cellular respiration in humans

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I haven't slept in 2 days and am so exhausted. Please if anyone could help... I have class in 2 hours and it's 3am rn

snow_lady [41]

Solution:-

a=Carbon(c)
b=Nitrogen ion(N+)
c=Oxygen ion(O-)

Now

Let's look at the EC of carbon(Z=6)

$\\ \tt\longmapsto 1s^22s^22p^2$

Valency is 4

Now.

3 electrons are shared(1 with H_3C and 2 with N+)

Hence

Electron left unshared=4-3=1

Lets look at EC of Nitrogen(N),Z=7

$\\ \tt\longmapsto 1s^22s^22p^3$

Valency is 3
It has already shared 3 electrons

But

Its Cation i.e N+

Hence 1 electron it donated .Now it has valency 4

Hence

Electron left unshared=4-3=1

Lets look at EC of Oxygen(Z=8)

$\\ \tt\longmapsto 1s^22s^22p^4$

Valency =2

But it is anion hence 1electron required more which us bonded

Hence

Number of electrons left unshared=0

5 0

3 years ago

These two particles have approximately the same mass:

ra1l [238]

A. is the answer

plz mark as brainliest. i really need it ;-;

3 0

3 years ago

What type of stress is caused by two plates sliding past one another?

NISA [10]

That stress is compression. It forms Reverse Faults.

7 0

3 years ago

What is the anode of a galvanic cell made with zinc and aluminum?

amm1812

Answer:

Aluminum Metal

Explanation:

A P E X states that it is Aluminum Metal 100% right

6 0

3 years ago

How many neutrons does element X have if its atomic number is 37 and its mass number is 80?

Verizon [17]

Answer: 43.

Explanation:

Mass number is the sum of protons and neutrons of an atom.

The number of prortons is the atomic number, so you can write:

Mass number = atomic number + number of neutrons. From which you get;

number of neutrons = mass number - atomic number = 80 - 37 = 43

All the atoms of a given element have the same number of protons. That is why the number of protons idenfies the elements and is called atomic number.

The number of neutrons of a given element may be different for different atoms of the same element.

The atoms of an element that have different number of neutrons are called isotopes. So, different isotopes of the same element have same atomic number but different mass number.

5 0

3 years ago

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