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4 years ago

An electron has _____.

Chemistry

1 answer:

irina [24]4 years ago

7 0

Answer:

An electron has more mass than a proton or a neutron.

Explanation:

Mass of electron - 9.109 e-31 kg

hope it helps!!

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Substance A undergoes a first order reaction A  B with a half- life of 20 min at 25 °C. If the initial concentration of A ([A]◦

nydimaria [60]

The concentration of A will be <em>0.34 mol·L⁻¹</em> after 60 min.

In a first-order reaction, the formula for the amount remaining after <em>n</em> half-lives is

$\text{[A]} = \frac{\text{[A]}_{0}}{2^{n}}\\$

If $t_{\frac{1}{2}} = \text{20 min}\\$

$n = \frac{t}{t_{\frac{1}{2}}} = \frac{\text{60 min}}{\text{20 min}}= \text{3.0}$

∴ $\text{[A]} = \frac{\text{2.7 mol/L}}{2^{3.0}} = \frac{\text{2.7 mol/L}}{8.0} = \textbf{0.34 mol/L}$

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3 years ago

Please help ASAP. If you know the answer to few of the parts then tell me the answer to the part you know with explanation and a

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Answer:

Most Medicare Advantage plans also fold in prescription drug coverage. Not all of thesef, g, and h. If you don't know the answer to all parts then just tell me the answer to the parts you know, and if you

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Always power off the system first.

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Please help me with this question, I already did part a and part b. Can someone please tell me how to do part c, d, e,

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2 years ago

A student was asked to separate a mixture of chemicals. The weight of each component within the mixture is as follows: potassium

hram777 [196]

Answer:

Explanation:

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4 years ago

What are two effects of too much exposure to radiation?

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You can develop acute radiation syndrome or skin cancer.

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3 years ago

Suppose the reaction system below has already reached equilibrium. Predict the effect that each of the following changes will ha

WARRIOR [948]

Explanation:

Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.

This principle states that if there is any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.

On removal of reactant from equilibrium reaction ,shifts the equilibrium in backward direction.
On addition of reactant from equilibrium reaction ,shifts the equilibrium in forward direction.
On removal of product from equilibrium reaction, shifts the equilibrium in forward direction.
On addition of product from equilibrium reaction, shifts the equilibrium in backward direction.

$UO_2(s) + 4 HF(g)\rightleftharpoons UF_4(g) + 2 H_2O(g)$

1. Water vapor is removed

On removal of water vapor from equilibrium will decrease the product which will lead to moving forward of an equilibrium that is equilibrium will shift to right direction.

2. $UF_4(g)$ is added

On addition of $UF_4(g)$ from equilibrium will increase the reactant which will lead to moving forward of an equilibrium that is equilibrium will shift to right direction.

3.The reaction is done in a glass reaction vessel. HF(g) attacks and reacts with the glass

Due to reaction of HF with glass will result in decrease in amount of HF present at equilibrium. So, order to counter this equilibrium will shift in backward direction or in left direction.

4. If the reaction is endothermic, and you want to make the equilibrium shift to the right to maximize the products, would you heat or cool the reaction vessel.

I endothermic reaction , heat is added to the reaction for which we can treat heat as a reactant.Now, we want to shift the equilibrium to right which means in the forward direction.

And this can be done by increasing the reactant amount, here by adding more heat to the equilibrium will shift the reaction to the right side.

So, for increasing heat we will heat the reaction vessel.

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3 years ago