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2 years ago

Which element is more metallic among beriliyum or calcium? Give reason

1 answer:

3 0

Both elements are in the same group but valence electrons of calcium are further away from the nucleus. They are not strongly held by the nucleus, hence are readily released. And readily released electrons means higher reactivity. Easy on the alkaline earth metals.

I hope this helps!

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The formula K2S indicates that:

sattari [20]

The answer is C. there are two potassium ions for each ion of sulfur

4 0

3 years ago

0.50 g of hydrogen chloride (HCl) is dissolved in water to make 4.0 L of solution. What is the pH of the resulting hydrochloric

svlad2 [7]

Explanation:

Given the mass of HCl is ---- 0.50 g

The volume of solution is --- 4.0 L

To determine the pH of the resulting solution, follow the below-shown procedure:

1. Calculate the number of moles of HCl given by using the formula:

$number of moles of a substance=\frac{given mass of the substance}{its molecular mass}$

2. Calculate the molarity of HCl.

3. Calculate pH of the solution using the formula:

$pH=-log[H^+]$

Since HCl is a strong acid, it undergoes complete ionization when dissolved in water.

$HCl(aq)->H^+(aq)+Cl^-(aq)$

Thus, $[HCl]=[H^+]$

Calculation:

1. Number of moles of HCl given:

$number of moles of a substance=\frac{given mass of the substance}{its molecular mass}\\=0.50g/36.5g/mol\\=0.0137mol$

2. Concentration of HCl:

$Molarity of HCl=\frac{number of moles of HCl}{its molar mass}\\=\frac{0.0137 mol}{4.0 L} \\= 0.003425 M$

3. pH of the solution:

$pH=-log[H^+]\\=-log(0.003425)\\=2.47$

Hence, pH of the given solution is 2.47.

3 0

3 years ago

Describe three devices used in radiation detection

xeze [42]

MicroR Meter, with Sodium Iodide Detector
Geiger Counter, with Geiger-Mueller (GM) Tube or Probe
Portable Multichannel Analyzer

6 0

3 years ago

What is 57.048 rounded to three significant figures?

AnnyKZ [126]

57.0 is it rounded to three sig figs. You count three spaces then round from there, which would be the zero and you would round down because the four is there.

4 0

3 years ago

How should you remove a beaker from a hot plate after heating it?.

rewona [7]

Answer:

Explanation:

you will have to grabe a towle or a meten and take it off

3 0

1 year ago