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3 years ago

Chemistry Help! Reasons why nonmetals form covalent bonds?

2 answers:

4 0

Non metals attain stability when they attain nobility .i. e. Fully filled outer shell. In order to achieve that, they undergo covalent bonding by sharing of electrons. Metals on the other hand have free electrons in their valence bands unlike non metals, they dont preferably require covalent bonding.

melisa1 [442]3 years ago

3 0

Okay thanks for reminding me

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What is the molarity of the Ca(OH)2 solution if 32.00 mL of Ca(OH)2 requires 16.08 mL of a 2.303 M solution for complete titrati

amm1812

Answer:

For this problem we just need to remember the equation and that the volume is always in liters: MaVa=MbVb

Ma= 1.338 mol/L Va= 18.75 mL= 0.01875 L Mb= x Vb=24.73 mL= 0.02473 L

So now we can plug into the equation and solve:

1.338 mol/L * 0.01875 L= x mol/L * 0.02473 L

This is a two step process: stoichiometry and using the answer from the first part to plug and chug it into the Molariy equation.

First step: setup the stoichiometry problem:

3.1171 g Na2CO3 * (1 mol/106 g) * (2 mol HCl/ 1 mol Na2CO3)= mol HCl

Second step: Molarity equation

Molarity= moles HCl/ L M= mol HCl/0.04027 L

For the third problem, you will just use the same equation as the first: MaVa= MbVb

Ma=0.57 M Va= x L Mb= 0.875 M Vb= 23.83 mL= 0.02383 L

0.57 M * x L= 0.875 M * 0.02383 L

With this equation, we want to find the moles of NaOH by using the molarity equation first then because MaVa= MbVb, we know that the number of moles has to be equal.

0.75 M= x mol/ 0.0227 L mol NaOH = 0.75 M *0.0227 L mol NaOH= 0.017025

So next, we can set it to the mass of the acid using this equation: Molar Mass= mass/ moles

Molar Mass= 3.6 g/ 0.017025 mol

And with that you will find the molar mass of HX, and even determine what X is.

Explanation:

hope I helped

8 0

3 years ago

How many molecules of sodium oxide will be created if 275 grams of sodium reacts with excess oxygen?

DaniilM [7]

Answer:

1.34 × 10²⁴ molecules

Explanation:

To calculate the number of molecules of sodium oxide that will be created if 275 grams of sodium reacts with excess oxygen, use the chemical equation to calculate the number of moles and then multiply by Avogadro's number.

1) Balanced chemical equation (given):

4Na + O₂ → 2Na₂O

2) Mole ratio:

4 mol Na : 2 mol Na₂O

3) Calculate the number of moles in 275 g of Na:

n = mass in grams / molar mass
mass of Na = 275 g
molar mass of Na₂O = 61.9789 g/mol

n = 275 g / 61.9789 g/mol = 4.437 mol of Na

4) Set a proportion to find the number of moles of product (Na₂O):

2 mol Na₂O / 4 mol Na = x / 4.437 mol Na

x = 4.437 / 2 mol Na₂O = 2.2185 mol Na₂O

5) Convert the number of moles to number of molecules:

# molecules = n × 6.022 × 10²³ molecules/mol = 2.2185 mol × 6.022 × 10²³ molecules/mol = 1.34 × 10²⁴ molecules (rounded to 3 significant figures).

6 0

4 years ago

The enzyme urease catalyzes this reaction. If urease is added to a solution that contains ammonia and other nitrogen-containing

Semmy [17]

The enzyme urease catalyze the hydrolysis of urea into ammonia and carbon dioxide. If urease is added to any compound which has no urea, it will not catalyze any reaction because if there is no urea, urease will not bind to any substance.

5 0

3 years ago

Read 2 more answers

Which of the following substance is most likely basic

ehidna [41]

Answer:

Please provide answer options. :)

5 0

3 years ago

When a person pushes off a wall with 15N of force,how much force does the wall push back

aivan3 [116]

Newton's third law of motion states that for every action force, there is an equal and opposite reaction force so that means that the wall is pushing you with the same amount of force that you put on it.

5 0

4 years ago