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2 years ago

How many valence electrons are found in atoms of group 14?

Chemistry

1 answer:

jeka942 years ago

7 0

Answer:

4 valence electrons.

Explanation:

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What is the frequency of a photon that has a wavelength of 754 um?

Bogdan [553]

Answer:

0.39760273

Explanation:

I typed into calculator hope it's right.

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2 years ago

To a 25.00 mL volumetric flask, a lab technician adds a 0.150 g sample of a weak monoprotic acid, HA , and dilutes to the mark w

Elis [28]

<u>Answer:</u> The number of moles of weak acid is $4.24\times 10^{-3}$ moles.

<u>Explanation:</u>

To calculate the moles of KOH, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}\text{Volume of solution (in L)}}$

We are given:

Volume of solution = 43.81 mL = 0.04381 L (Conversion factor: 1L = 1000 mL)

Molarity of the solution = 0.0969 moles/ L

Putting values in above equation, we get:

$0.0969mol/L=\frac{\text{Moles of KOH}}{0.04381}\\\\\text{Moles of KOH}=4.24\times 10^{-3}mol$

The chemical reaction of weak monoprotic acid and KOH follows the equation:

$HA+KOH\rightarrow KA+H_2O$

By Stoichiometry of the reaction:

1 mole of KOH reacts with 1 mole of weak monoprotic acid.

So, $4.24\times 10^{-3}mol$ of KOH will react with = $\frac{1}{1}\times 4.24\times 10^{-3}=4.24\times 10^{-3}mol$ of weak monoprotic acid.

Hence, the number of moles of weak acid is $4.24\times 10^{-3}$ moles.

6 0

2 years ago

18.Which shows chemical weathering?

lakkis [162]

Answer:

18:A

19:C

20:D NOT SURE

22:A

24:B

8 0

2 years ago

Read 2 more answers

How can you tell the difference between a compound and a heterogeneous mixture?

skad [1K]

Answer:

If a substance can be separated into its elements, it is a compound. If a substance is not chemically pure, it is either a heterogeneous mixture or a homogeneous mixture. If its composition is uniform throughout, it is a homogeneous mixture.

Explanation:

I hope it may help u

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3 years ago

What energy form is a bow and arrow??

lakkis [162]

Hello Naphya,

Question - What Energy Form Is A Bow And Arrow

Answer - Potential Energy

Why - "The energy is stored in the limbs in the form of potential energy; when the string is released the energy stored into the limbs is released, most of which is absorbed by the arrow."

3 0

3 years ago