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aliina [53]
2 years ago
10

Nuclear decay occurs according to first-order kinetics. What is the half-life of zinc-65 if a sample decays from 65.0 g to 2.90

g in 3.0 years
Chemistry
1 answer:
Aleks [24]2 years ago
8 0

Answer:

Explanation:

244 days

will you brainlyest?

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A chemist is looking at an electrically neutral atom that has three valence electrons. If she knows the element is a metalloid,
Rus_ich [418]
Your answer is boron,

I looked at the periodic table, there is nothing else that falls under this specs.


8 0
3 years ago
What sort of nucleophile does NADH supply?
Elden [556K]

Answer:

Hydride ion

Explanation:

You often see the reduction with NADH written as

NADH ⟶ NAD⁺ + H⁺ + 2e⁻

If you think about it, H⁺ + 2e⁻ is equivalent to H:⁻, so we could write the reaction as

NADH ⟶ NAD⁺ + H:⁻

In terms of a mechanism, the dihydropyridine ring of NADH transfers a hydrogen atom with its pair of electrons (a hydride ion) to the substrate and becomes the more stable, aromatic pyridinium ion in NAD⁺.

7 0
4 years ago
Question 2(Multiple Choice Worth 4 points)
densk [106]

Answer:

B. Construct a hypothesis

6 0
3 years ago
Read 2 more answers
Identify the elements given the orbital diagrams listed below.​
Mrrafil [7]

Answer:

See explanation.

Explanation:

1. There are 8 electrons. Elements that end with 2p orbitals are in the 2nd period (aka row) of the periodic table. Elements that have 4 electrons in 2p are in the 16th group (aka column) (column 16 may also be referred to as 6A) of the periodic table. So looking at row 2, column 16, we can see that the first diagram is of O, Oxygen.

2. 8 electrons. This is the same diagram as the one above.

3. 13 electrons. Elements ending with 3p are in period 3. Elements with 1 valence electron in a p orbital are in group 13 (aka group 3A).

4. 7 electrons. We already know 2p is period 2. 3 valence electrons in a p orbital means that it is in group 15/group 5A.

I did not write the answers for #3 and 4 but they can be easily found on a periodic table with the info I gave.

4 0
4 years ago
What is the molarity of a solution
Dafna1 [17]

Answer:

multiple that number

Explanation:

it the right way to do it

8 0
3 years ago
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