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Darina [25.2K]
3 years ago
12

Alkali metals are relatively soft because the atoms contribute only one _____ to a metallic bond

Chemistry
1 answer:
vesna_86 [32]3 years ago
7 0

Valence Electron because the more valence electrons an atom can contribute the shared pool, the stronger the metallic bonds will be

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An acid sample of an unknown concentration is contained in a erlenmeyer flask. Which technique below would be best suited to ana
Ivenika [448]

Answer:

Titration

Explanation:

The best technique which can be used to determine the number of moles of the HCl in the sample is titration.

The given amount of HCl solution must be titrated with known concentration of the base like NaOH.

The volume of NaOH required must be noted also.

According to the reaction,

NaOH+HCl\rightarrow NaCl+H_2O

At equivalence point

Moles of HCl = Moles of NaOH

Considering:-

Moles of HCl=Molarity_{NaOH}\times Volume_{NaOH}

Thus, in this way, moles of HCl can be determined.

4 0
3 years ago
If the concentration of the HCl used in your titration was 1.00 M and you used 23.68 mL to reach the endpoint, calculate the con
drek231 [11]

Answer: The concentration of the OH-, CB = 0.473 M.

Explanation:

The balanced equation of reaction is:

2HCl + Ca(OH)2 ===> CaCl2 + 2H2O

Using titration equation of formula

CAVA/CBVB = NA/NB

Where NA is the number of mole of acid = 2 (from the balanced equation of reaction)

NB is the number of mole of base = 1 (from the balanced equation of reaction)

CA is the concentration of acid = 1M

CB is the concentration of base = to be calculated

VA is the volume of acid = 23.65 ml

VB is the volume of base = 25mL

Substituting

1×23.65/CB×25 = 2/1

Therefore CB =1×23.65×1/25×2

CB = 0.473 M.

6 0
3 years ago
Poh of a solution with a ph of 5.00
creativ13 [48]

Answer:

9

Explanation:

14-5.=pOH

- Hope that helps! Please let me know if you need further explanation.

8 0
3 years ago
When inhaled, crystalline silica can cause scar tissue to form on what organs?
julsineya [31]

Crystalline silica is hazardous when small particles are inhaled. They can penetrate deep into the lungs and cause disabling and sometimes fatal lung diseases including silicosis, lung cancer and kidney disease. The particles of crystalline silica enters the lungs and causes the formation of scar tissue known as silicosis, thus reducing the lungs’ ability to take in oxygen.

5 0
3 years ago
To standardize an H2SO4 solution, you put 20.00 mL of it in a flask with a few drops of indicator and put 0.450 M NaOH in a bure
hram777 [196]

To standardize 20.00 mL of 0.495 M H₂SO₄ are used 44.10 mL of 0.450 M NaOH in a neutralization reaction.

We want to standardize a H₂SO₄ solution with NaOH. The neutralization reaction is:

H₂SO₄ + 2 NaOH ⇒ Na₂SO₄ + H₂O

The buret, which contains NaOH, reads initially 0.63 mL, and 44.73 mL at the endpoint. The used volume of NaOH is:

V = 44.73 mL - 0.63 mL = 44.10 mL

44.10 mL of 0.450 M NaOH are used for the titration. The reacting moles of NaOH are:

0.04410 L \times \frac{0.450mol}{L} = 0.0198 mol

The molar ratio of H₂SO₄ to NaOH is 1:2. The moles of H₂SO₄ that react with 0.0198 moles of NaOH are:

0.0198 mol NaOH \times \frac{1molH_2SO_4}{2molNaOH} = 0.00990 molH_2SO_4

0.00990 moles of H₂SO₄ are in 20.00 mL of solution. The molarity of H₂SO₄ is:

[H_2SO_4] = \frac{0.00990mol}{0.02000} = 0.495 M

To standardize 20.00 mL of 0.495 M H₂SO₄ are used 44.10 mL of 0.450 M NaOH in a neutralization reaction.

Learn more: brainly.com/question/2728613

7 0
3 years ago
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