CHEMISTRY HIGH SCHOOL

What is the [H+] if the pH of asolution is 1.65?
a
[H+] = [ ? ] x 10!?)
Coefficient (green)
Exponent (yellow)
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Answers

Answer 1

Answer:

Solution:

$[\text{H}^(+)] = 10^{-\text{pH}}$

$[\text{H}^(+)] = 10^(-1.65)$

$\boxed{[\text{H}^(+)] = 2.2 × 10^(-2) \: M}$

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How are sublimation and evaporation. similar

Answers

They both turn states of matter into gases. Sublimation turns a solid into a gas, while evaporation turns a liquid into a gas. Hope this helps! :)

Energy transfer by convection is primarily restricted toA. gases.
B. liquids.
C. solids.
D. fluids.
E. none of the above

Answers

The answer is fluids.

Final answer:

Convection is the transfer of heat in a fluid (which can be a liquid or gas) through the movement of its particles. A fluid near a heat source will get heated, causing it to rise and exchange place with the cooler, denser fluid.

Explanation:

Energy transfer by convection is primarily restricted to both liquids and gases, which are both classified as fluids. Hence, the correct answer is D. Fluids.

Convection refers to heat transfer in a gas or liquid by the circulation of currents from one region to another. This happens when a fluid near a heat source gets heated, its particles move faster and spread apart, causing the fluid to become less dense. As a result, the warmer, less dense fluid rises, and the cooler, denser fluid sinks. The continuous movement of fluid in this way creates what we call a convection current, which results in the transfer of energy.

Learn more about Energy Transfer by Convection here:

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Solids and liquids have both mass and volume, but a gas has only mass.
a. True
b. False

Answers

True. A gas does not have a definite volume. Therefore, making this statement correct.

Answer:

True. A gas does not have a definite volume. Therefore, making this statement correct.

Explanation:

true

Complete the following equations by correctly matching the appropriate product.

Answers

Answer: $_(82)^(206)\textrm {Pb}$

Explanation:

Alpha decay: In this process, alpha particles is emitted when a heavier nuclei decays into lighter nuclei. The alpha particle released has a charge of +2 units.

The general alpha decay reaction is given as:

$_Z^A\textrm{X}\rightarrow _(Z-2)^(A-4)\textrm{Y}+_2^4\alpha$

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

Thus the balanced reaction is :

$_(84)^(210)\textrm{Po}\rightarrow _(82)^(206)\textrm{Pb}+_2^4\alpha$

the first equation we are emitting an alpha particle so we take the top number and decrease it by 4 from 210 to 206 and the bottom number by 2 from 84 to 82. so that would match with Pb-206 (the 206 is the top number)

the second equation the 218 will drop to 214 and the 84 to 82 leaving us with Pb-214

In a fission reaction of U-235, there was a release of 9.20 × 1011 kJ of energy. What amount of mass in kilograms would have been lost?Recall that c = 3 × 108 m/s.

Answers

e = mc^2

m = e / c^2

Plug in your numbers in the appropriate units.
m=1.02 × 10^-5

Answer : The amount of mass in kilograms lost would be, $1.022* 10^(-2)Kg$

Solution : Given,

Energy of released in the reaction = $9.20* 10^(11)KJ$

Speed of light = c = $3* 10^8m/s$

Formula used :

$E=m* c^2$

where,

E = energy released

m = mass

c = speed of light

Now put all the given values in the above formula, we get the amount of mass would have been lost.

$9.20* 10^(11)KJ=m* (3* 10^8m/s)^2$

$m=1.022* 10^(-5)KJ/m^2s^(-2)=1.022* 10^(-5)* 10^3Kg=1.022* 10^(-2)Kg$

conversion : $(1KJ/Kg=10^3m^2/s^2)$

Therefore, the amount of mass in kilograms lost would be, $1.022* 10^(-2)Kg$

"Enzymes help to achieve the equilibrium faster but cannot changethe thermodynamic
equilibrium constant. Why?"

Answers

Equilibrium constant Kc is defined as the concentration of products over reactants raised to the the powers of its respective molar ratios in of the balanced chemical reaction.
A catalyst by definition is a compound able to catalyse a reaction while being chemically unchanged in the process. The catalyst works by lowering the activation energy by providing an alternative pathway of lower activation energy.
The is no value in the equation whereby activation energy will affect the equilibrium constant.
To know the speed where the reaction reaches equilibrium we need to look at the rate equation also known as Arrhenius equation,
K= Ae^(-Ea/RT)
Here we can see with the lowering of Ea ( activation energy ) the rate constant rises causing the reaction to reach equilibrium quicker.

Final answer:

Enzymes cannot change the thermodynamic equilibrium constant of a reaction because they do not alter the free energy difference between the reactants and products.

Explanation:

Enzymes are biological catalysts that speed up chemical reactions by lowering the activation energy required for the reaction to occur. They achieve this by providing an alternative reaction pathway with a lower activation energy. However, enzymes cannot change the thermodynamic equilibrium constant of a reaction.

The thermodynamic equilibrium constant is a measure of the ratio of products to reactants at equilibrium. It is determined by the difference in free energy between the reactants and products. Enzymes, although they accelerate the rate at which equilibrium is reached, do not alter the free energy difference between the reactants and products. Therefore, they cannot change the equilibrium constant.

Learn more about enzymes and thermodynamic equilibrium here:

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