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Nat2105 [25]
3 years ago
9

An atom of aluminum (Al) has an atomic number of 13 and a mass number of 27. How many neutrons does it have? O A. 27 O B. 40 O C

. 14 D. 13
​
Chemistry
1 answer:
Allisa [31]3 years ago
8 0

Answer:

C. 14

Explanation:

The mass number is the number of protons + neutrons and the atomic number is the number of protons.

If the mass number is 27, you subtract the atomic number, 13.

27 - 13 = 14 neutrons

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kari74 [83]

Answer:

I'd say the answer is Clustered (Based on the image)

6 0
3 years ago
Which element is a metalloid out of aluminum, arsenic, carbon, and helium?
Katyanochek1 [597]

Answer:

arsenic

Explanation:helium is a gas and aluminum is a etal and carbon is not a maetalloid

6 0
3 years ago
Do bromide ions accept or donate an electron in redox reactions? how do you know?​
Vaselesa [24]

Bromide ions donates an electron in redox reactions.

<u>Explanation:</u>

  • In these redox reactions, the halide ions like bromide donates a pair of electrons and acts as a reducing agents, but itself gets oxidized to bromine.
  • In this process, the oxidation state of bromide ion is increased from -1 to 0 oxidation state, that is Br⁻ (-1) to Br₂ (0), thus reduces the compound and oxidizes by itself.
  • Bromide ion is a strong reducing agent, thereby reduces sulfuric acid which changes to sulfur di oxide, but this doesn't happen in the case of chloride and fluoride ions as they are not having that much capacity like bromide and iodide ions.
4 0
3 years ago
An analytical chemist is titrating of a solution of propionic acid with a solution of . The of propionic acid is . Calculate the
motikmotik

Answer:

Heres my attempt at this and hope it helps friend

.1372L * (.83M/L) = .114 mols propanoic acid

.06862L * (1.1M/L) = 0.0755 mols NaOH

using the henderson hasselbach equation

ph = pKa + log([A-]/[HA])

so

ph = 4.89 + log(.0755/.114) = 4.72

Explanation:

Identify at least three reasons the Articles of Confederations failed as a governing document. In your opinion, evaluate which defect was most debilitating, using evidence and your knowledge of American government to justify your position.

3 0
3 years ago
A gas of 19 mL at a pressure of 740 mmHg can be expected to change its pressure when its volume changes to 30. mL. Express its n
Soloha48 [4]

To solve this we assume that the gas is an ideal gas. Then, we can use the ideal gas equation which is expressed as PV = nRT. At a constant temperature and number of moles of the gas the product of PV is equal to some constant. At another set of condition of temperature, the constant is still the same. Calculations are as follows:

 

P1V1 =P2V2

P2 = P1V1/V2

P2 = 740mmhg x 19 mL / 30 mL

<span>P2 = 468.67 mmHg = 0.62 atm</span>

6 0
3 years ago
Read 2 more answers
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