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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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You prepare a 2nd solution (solution B) by pipetting 10.00 ml of your 1st solution (solution A) into a 50.00 ml volumetric flask

elena-14-01-66 [18.8K]

Answer:

Concentration solution A was 0.5225 M

Explanation:

10.00 mL of solution A was diluted to 50.00 mL and yields 50.00 mL of solution B

According to laws of dilution- $C_{A}V_{A}=C_{B}V_{B}$

where, $C_{A}$ and $C_{B}$ are concentration of solution A and B respectively

$V_{A}$ and $V_{B}$ are volumes of solution A and B respectively

Here $C_{B}$ = 0.1045 M, $V_{B}$ = 50.00 mL and $V_{A}$ = 10.00 mL

Hence, $C_{A}=\frac{C_{B}V_{B}}{V_{A}}=\frac{(0.1045M\times 50.00mL)}{10.00mL}=0.5225M$

So, concentration solution A was 0.5225 M

8 0

3 years ago

How many milliliters of 0.1 m hcl is required to react with 0.15g sodium carbonate (na2co3?

docker41 [41]

1) Write the balanced chemical equation

2HCl + Na2 CO3 ----------> 2NaCl + H2CO3

2) Write the molar ratios:

2 mol HCl : 1 mol Na2CO3 : 2 mol NaCl : 1 mol H2CO3

3) Convert 0.15g of sodium carbonate to number of moles

3a) Calculate the molar mass of Na2CO3

Na: 2 * 23 g/mol = 46 g/mol

C: 12 g/mol =

O: 3 * 16 g/mol = 48 g/mol

molar mass = 46g/mol + 12g/mol + 48g/mol = 106 g/mol

3b.- Calculate the number of moles of Na2CO3

# moles = grams / molar mass = 0.15 g / 106 g/mol = 0.0014 mol Na2CO3

4) Calculate the number of moles of HCl from the molar proportion:

[0.0014 mol Na2CO3] * [2 mol HCl / 1 mol Na2CO3] = 0.0028 mol HCl

5) Calculate the volume of HCl from the definition of Molarity

Molarity, M = # moles / volume in liters

=> Volume in liters = # moles / M = 0.0028 mol / 0.1 M = 0.028 liters

0.028 liters * 1000 ml / liter = 28 ml.

Answer: 28 mililiters of 0.1 M HCl.

7 0

3 years ago

What type of reaction occurs between aqueous ammonia solution and an acid?

gizmo_the_mogwai [7]

Neutralization reaction.

8 0

3 years ago

Read 2 more answers

Which base(s) is weaker than ammonia?

Dominik [7]

Answer:

Hydroxylamine and pyridine