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34kurt
2 years ago
13

Radioactive phosphorus-32 decays with a half-life of 14.0 days. A chemist obtains a fresh sample of phosphorus-32 and measures i

ts radioactivity. She then determines that to do an experiment, the radioactivity cannot fall below 25% of the initial measured value. How many days does she have to perform the experiment
Chemistry
1 answer:
solniwko [45]2 years ago
3 0

It will take 28 days to let the radioactivity fall below 25%.

<h3>What is Half Life ?</h3>

Half life can be described as the time required by the radioactive compound to reduce to half of the original value of concentration.

It is given that

Radioactive phosphorus-32 decays with a half-life of 14.0 days

25% of the initial measure at what time =?

For 50% decay the time needed is 14 days

for decay of the next 50%  of the amount left the time taken will be another 14 days

2nd half life = 25% decay of the substance = 28 days

Therefore it will take 28 days to let the radioactivity fall below 25%.

To know more about Half Life

brainly.com/question/24710827

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I need help with this
natulia [17]

Answer:

129 units cubed

Explanation:

There are ten spaces between 120 and 130, so we can infer that each line represents a change in volume of 1 unit. The volume of the substance in the graduated cylinder looks like it's 1 under 130, so its volume is 129 units.

Hopefully this was helpful! :)

6 0
2 years ago
Select the true statements about alpha particles. Alpha particles have a nuclear charge of +1. Alpha particle formation is accom
Otrada [13]

Answer : The correct statement is, Alpha particles have a mass number of 4.

Explanation:

Alpha particle : It is also known as alpha radiation or alpha ray that consists of 2 protons and 2 neutrons that are bound together into a particle that is identical to the helium nucleus. It is produced in the process of alpha decay.

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 representation of alpha decay reaction is:

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

Conversion of proton into neutron leads to releasing in positron.

Positron emission : It is defined as the emission process in which positron particle is emitted. In this process, a proton gets converted to neutron and an electron neutrino particle.

_Z^A\textrm{X}\rightarrow _{Z-1}^A\textrm{Y}+_{+1}^0e

Conversion of neutron into proton leads to release in electron or beta particle.

Beta minus decay : It is a type of decay process, in which a neutrons gets converted to proton, an electron and anti-neutrino. In this the atomic mass number remains same.

The beta minus decay equation is represented as,

_Z^A\textrm{X}\rightarrow _{Z+1}^A\textrm{Y}+_{-1}^0e

(A is the atomic mass number and Z is the atomic number)

From the given statements we conclude that, the statement alpha particles have a mass number of 4 is correct statement while the other statements are wrong of alpha particles.

Hence, the correct statement is, Alpha particles have a mass number of 4.

5 0
2 years ago
WILL GIVE BRAINEST + 500 PTS ...
IRINA_888 [86]

Answer:

1. expanding

2. red, blue

3. red, spreading out

Explanation:

6 0
3 years ago
Calculate the number of moles found in 88.02g of CO2
bija089 [108]

Answer:

2.00moles

Explanation:

mol=mass/mr

88.02/ [12+2(16)] = 2.00

6 0
3 years ago
Calculate the molar mass of (NH4)3AsO4.
Marysya12 [62]

Answer:

193.07 g / mol

Explanation:

Molar mass of (NH₄)₃ = 3 * (14.01 + 4 * 1.01) = 54.15

As = 74.92 and O₄ = 4 * 16 = 64

Answer is 54.15 + 74.92 + 64 = 193.07

3 0
3 years ago
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