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rjkz [21]
3 years ago
9

(((Please help! Giving brainliest!)))

Chemistry
1 answer:
aleksandr82 [10.1K]3 years ago
8 0

Answer:

C. Both particles A and B

Explanation:

Because in a nucleus, there are only protons (positive) and neutron (no charge).

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Which of the following statements explains why atoms are always neutral in charge
laila [671]

Answer:

D. They have the same number of protons as electrons.

Explanation:

Protons are found in the nucleus of the atom and have a positive charge while electrons orbit around the nucleus and have a negative charge. Usually, in a neutral atom of an element, the number of protons is equal to the number of electrons. This is why the atom has no charge because the positive and negative charges cancel out. When an atom loses an electron its charge turns positive while when it gains an electron its charge turns negative.

6 0
2 years ago
A 50.0-ml sample of 0.200 m sodium hydroxide is titrated with 0.200 m nitric acid. calculate the ph in the titration after you a
attashe74 [19]

Hey there!:

Concentration of NaOH = 0.200 M

Concentration of HNO₃= 0.200 M

Total volume =  50.0 mL + 60.0 mL = 110 mL=> 0.11 L

The neutralization reaction between  NaOH and HNO3 :

OH⁻  + H⁺  ---------->  H₂O

So :

n ( H⁺ ) = 60 mL * 0.200 M / 1000 mL  => 0.012 moles of H⁺

n ( OH⁻ ) = 50 mL 0.200 M / 1000 mL => 0.01 moles of OH⁻

Hence OH⁻ is limiting reagent  .

Remaining moles of  H⁺ = 0.012 - 0.01  =>  0.002 moles

Concentration of H⁺  = 0.002 M / 0.11 L

Concentration of H⁺ = 0.01818 moles/L

Therefore:

pH = - log [ H⁺ ]

pH = - log [ 0.01818 ]

pH = 1.74

Hope that helps!

7 0
3 years ago
Express the quantity 24.2×10-5 m in mm. express your answer using three significant figures.
sergiy2304 [10]
I think you meant 2.42*10^-6
Remember, the first digit must be between 1 and 10 or - 1 and - 10.
(2.42*10^-6)(1000)
=0.242mm
3 0
3 years ago
What is the volume occupied by 3.00 mol of hydrogen gas at STP? *
xxTIMURxx [149]

Answer: V=67.2 L

Explanation:

For this problem we will need to use the Ideal Gas Law.

Ideal Gas Law: PV=nRT

P=1.00 atm (STP)

V=?

n=3.00 mol

R=0.08206Latm/Kmol

T=273.15 K (STP)

To find V, we would manipulate the equation to V=nRT/P

V=\frac{(3.00 mol)(0.08206Latm/Kmol)(273.15K)}{1.00 atm}

V=67.244 L

With significan figures, our answer is V=67.2 L.

6 0
3 years ago
The product of nuclear ___ is several nuclei
garri49 [273]

I think Its "fission"

3 0
3 years ago
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