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3 years ago

What change in atomic number occurs when a nucleus emits an alpha particle? a beta particle? a gamma ray?

Chemistry

1 answer:

marissa [1.9K]3 years ago

7 0

1. Alpha decay

Alpha particle is a ₂⁴He nucleus. When a parent atom emits an alpha particle, the atomic number reduces by 2 in the formed daughter atom while reducing the mass number by 4. Since atomic number = proton number, due to the decreasing of atomic number, proton number also reduces by 2 in daughter nucleus.

2. Beta emission.

There are two types of beta decay. One is β⁻ and other one is β⁺ emission.

β⁻ emission

β⁻ emission is an emission of an electron by converting a neutron to a proton. Hence, in β⁻ decay, the atomic number increases by 1 and mass number is not changed in the formed daughter nucleus.

β⁺ emission

β⁺ emission is an emission of an positron while converting a neutron to a proton. Hence, in β⁺ decay, the atomic number decreases by 1 and mass number is not changed in the formed daughter nucleus.

3. Gamma decay

In Gamma decay there is no any particle decay from the parent nucleus. Unstable nucleus emits energy photon and becomes as stable by undergoing a gamma decay. Hence, there is no change in atomic number or mass number of the daughter atom.

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What type of reaction happens in a nuclear power plant?

Zanzabum

When a large fissile atomic nucleus such as uranium-235 or plutonium-239 absorbs a neutron, it may undergo nuclear fission. The heavy nucleus splits into two or more lighter nuclei, (the fission products), releasing kinetic energy, gamma radiation, and freeneutrons

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3 years ago

Calculate the volume of naoh solution that contains 0.72 g of a 8.0 % (m/v) naoh solution.

Hitman42 [59]

A solution contains 12 g of glucose in 240 mL of solution. What is the mass/volume % of the solution? 5.0% (m/v). Calculate the grams of KCl in 225 g of an 8.00 % (m/m) KCl solution

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3 years ago

A student has two solutions of a substance. Solution-1: 25M, 400mL, and Solution-2: 30M, 300 ml. What is the molarity of the fin

castortr0y [4]

Answer:

The molarity of the final solutions if these two solutions are mixed is 27.14 $\frac{moles}{L}$

Explanation:

Yo know:

Solution-1: 25M, 400mL
Solution-2: 30M, 300 mL

Molarity being the number of moles of solute per liter of solution, expressed by:

$Molarity (M)= \frac{number of moles}{volume}$

You can determine the number of moles that are mixed from each solution as:

Number of moles= Molarity*Volume

So, being 1 L=1000 mL, for each solution you get:

Solution-1: being 0.400 L=400 mL ⇒ 25 M* 0.400 L= 10 moles
Solution-2: being 0.300 L=300 mL ⇒ 30 M* 0.300 L= 9 moles

When mixing both solutions, it is obtained that the volume is the sum of both solutions:

Total volume= volume solution-1 + volume solution-2

and the number of total moles will be the sum of the moles of solution-1 and solution-2:

Total moles= moles of solution-1 + moles of solution-2

So the molarity of the final solution is:

$Molarity (M)= \frac{moles of solution 1 + moles of solution 2}{Volume solution 1 + Volume solution 2}$

In this case, you have:

moles of solution-1: 10 moles
moles of solution-2: 9 moles
volume solution-1: 0.400 L
volume solution-2: 0.300 L

Replacing:

$Molarity (M)=\frac{10 moles + 9 moles}{0.400 L + 0.300 L}$

Solving:

$Molarity (M)=\frac{19 moles}{0.700 L}$

Molarity= 27.14 $\frac{moles}{L}$

The molarity of the final solutions if these two solutions are mixed is 27.14 $\frac{moles}{L}$

4 0

4 years ago

What makes a gas a gas?

Grace [21]

Answer:

Gas is one of the four fundamental states of matter (the others being solid, liquid, and plasma). A pure gas may be made up of individual atoms (e.g. a noble gas like neon), elemental molecules made from one type of atom (e.g. oxygen), or compound molecules made from a variety of atoms (e.g. carbon dioxide).

Explanation:

5 0

3 years ago

Read 2 more answers

Adding a(n) [Select] ' will slow down a chemical reaction.

leva [86]

Inhibitor

Explanation:

Adding an inhibitor will slow down a chemical reaction. Inhibitors works like a negative catalyst.

The addition of a foreign body can influence the rate of a reaction.

When a foreign body slows down a reaction, it is called an inhibitor.
An inhibitor is a negative catalyst that will slow down a reaction.
Such substances do not allow a reaction to proceed freely and very fast.
They work in the opposite way a normal catalyst would.
It is good to know conditions and chemicals that can inhibit a chemical reaction.

learn more:

Catalysts brainly.com/question/8413755

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4 0

3 years ago