Which two gases make up most of the atmosphere?

Answers

Answer 1

Answer: nitrogen wich comprises 78% of the atmosphere and oxygen wich accounts for 21%

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When was Carbon discovered? (The element from the periodic table)

Answers

Carbon was discovered in 3750 BC

Which equation is a decomposition reaction?a. Li2CO3 ---> Li2O + CO2

b. Zn + HCl ---> ZnCl2 + H2

c. Na2O + CO2 ---> Na2CO3

d. C6H12O6 + O2 ---> CO2 + H2O

please help asap

Answers

Answer : (a) $Li_2CO_3\rightarrow Li_2O+CO_2$ is a decomposition reaction.

Explanation :

(a) $Li_2CO_3\rightarrow Li_2O+CO_2$ is a decomposition reaction.

Decomposition reaction : It is a type of chemical reaction in which a single compound decomposes into two or more compounds.

(b) $Zn+2HCl\rightarrow ZnCl_2+H_2$ is a displacement reaction.

Displacement reaction : It is a type of reaction in which a most reactive element displaces the least reactive element in a compound.

(c) $Na_2O+CO_2\rightarrow Na_2CO_3$ is a combination reaction.

Combination reaction : It is a type of reaction where two or more compounds combine to form a single compound.

(d) $C_6H_(12)O_6+6O_2\rightarrow 6CO_2+6H_2O$ is a combustion reaction.

Combustion reaction : It is a type of reaction where a hydrocarbon react with the oxygen to produced carbon dioxide and water.

Therefore, option (a) is a decomposition reaction.

The reaction in which reactant breaks down into more than one constituents is called decomposition reaction. So option A. Li2CO3 ---> Li2O + CO2 is correct.

A certain reaction has an activation energy of 66.41 kJ/mol. At what Kelvin temperature will the reaction proceed 3.00 times faster than it did at 293 K?

Answers

Answer : The temperature will be, 392.462 K

Explanation :

According to the Arrhenius equation,

$K=A* e^{(-Ea)/(RT)}$

or,

$\log ((K_2)/(K_1))=(Ea)/(2.303* R)[(1)/(T_1)-(1)/(T_2)]$

where,

$K_1$ = rate constant at $T_1$ = $K_1$

$K_2$ = rate constant at $T_2$ = $3K_1$

$Ea$ = activation energy for the reaction = 66.41 kJ/mole = 66410 J/mole

R = gas constant = 8.314 J/mole.K

$T_1$ = initial temperature = 293 K

$T_2$ = final temperature = ?

Now put all the given values in this formula, we get:

$\log ((3K_1)/(K_1))=(66410J/mole)/(2.303* 8.314J/mole.K)[(1)/(293K)-(1)/(T_2)]$

$T_2=392.462K$

Therefore, the temperature will be, 392.462 K

You have a stock bottle of HCl (aq) which is 12.1M, You need 400 mL of 0.10M HCl. How much of the acid and how much water will you need?

Answers

Mols of acid needed: 0.4 liters x 0.10 mol/liter = 0.04 mol

Volumen of acid in the bottle than contaiins 0.04 mol of acid: V = #moles/M = 0.04 mol/12.1 mol/liter = 0.003306 liters = 3.306 ml

Then you need 3.3 ml of acid from the bottle and 396.7 ml of pure water to get 400 ml of acid 0,1 M

Which of the following bodily organs or systems can be affected by ionizing radiation? Glands,
Eyes,
Genitals,
Nervous system,
Gastrointestinal system?

Answers

The correct answer is the fourth option. The nervous system is the system in the body which can be affected by ionizing radiation. Exposure to this kind of radiation may lead to changes in motor function or neurological disorders.

Given the equation representing a system at equilibrium:N2(g) + 3H2(g)<==>2NH3(g) + energyWhich changes occur when the temperature of this system is decreased?
(1) The concentration of H2(g) increases and the concentration of N2(g) increases.
(2) The concentration of H2(g) decreases and the concentration of N2(g) increases.
(3) The concentration of H2(g) decreases and the concentration of NH3(g) decreases.
(4) The concentration of H2(g) decreases and the concentration of NH3(g) increases.

Answers

When the temperature is decreased, the concentration of H2(g) decreases and the concentration of NH3(g) increases.

What is equilibrium?

The term equilibrium refers to the point when the rate of forward reaction is equal to the rate of reverse reaction. In that case, the reaction has attained a dynamic equilibrium.

Now, when the temperature is decreased, the concentration of H2(g) decreases and the concentration of NH3(g) increases.

Learn more about reaction equilibrium:brainly.com/question/15118952

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N2(g) + 3H2(g)<==>2NH3(g) + energy, the changes that occur when the temperature of this system is decreased is that concentration of H2(g) decreases and the concentration of NH3(g) increases. The answer is number 4. The rest of the choices do not answer the question above.

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