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Neporo4naja [7]
3 years ago
9

Based on the periodic table why are be, bg, ca and sr in the same column/group/family?

Chemistry
1 answer:
Lesechka [4]3 years ago
7 0

Answer:

The elements are in the same column/group IIA.

See the explanation below, please.

Explanation:

The elements Calcium, Strontium, Beryllium, Magnesium, Barium and Radio, belong to the group of alkaline earth metals located in group IIA of the periodic table, they require 2 electrons to complete their octet (they have 2 valence electrons). reagents than alkali metals.

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Elements that are good conductors of heat and electric current. On the left side of the periodic table. Majority of elements. Wh
lilavasa [31]

Answer:

As with all metals, the alkali metals are malleable, ductile, and are good conductors of heat and electricity. The alkali metals are softer than most other metals. The alkaline earth elements are metallic elements found in the second group of the periodic table.

3 0
3 years ago
A solution of NaCl (aq) is added slowly to a solution of lead nitrate, Pb(NO3)2 ( aq ), until no further precipitation occurs. T
Feliz [49]

Answer:

0.19615 M

Explanation:

Calculation of the moles of PbCl_2 as:-

Mass = 10.91 g

Molar mass of PbCl_2 = 278.1 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

Moles= \frac{10.91\ g}{278.1\ g/mol}

Moles= 0.03923\ mol

According to the reaction shown below:-

Pb(NO_3)_2_{(aq)} + 2NaCl_{(aq)}\rightarrow PbCl_2_{(s)} + 2NaNO_3_{(aq)}

1 mole of PbCL_2 is produced when 1 mole of Pb(NO_3)_2 undergoes reaction.

0.03923 mole of PbCL_2 is produced when 0.03923 mole of Pb(NO_3)_2 undergoes reaction.

Mole of Pb(NO_3)_2 = 0.03923 mole

Volume = 200.0 mL = 0.2 L ( 1 mL = 0.001 L )

Molarity is defined as the number of moles present in one liter of the solution. It is basically the ratio of the moles of the solute to the liters of the solution.

The expression for the molarity, according to its definition is shown below as:

Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}

So,

Molarity=\frac{0.03923}{0.2}\ M= 0.19615\ M

<u>0.19615 M is the molarity of the Pb(NO_3)_2 solution.</u>

5 0
4 years ago
How are you guys Now help me
KengaRu [80]

Answer:

Explanation:

im sorry dont knwo

i think its the second one

6 0
3 years ago
What is the mass of 9.00 x 10 22 atoms of magnesium, Mg?
levacccp [35]

Hey there!

\large\boxed{\text{3.6g}}

One mole of magnesium has a mass of 24.31 g.

This is 6.022 x 10²³ atoms of magnesium.

We want to convert 9.00 x 10²² atoms to moles.

For every one mole of magnesium, there are 6.022 x 10²³ atoms, so divide:

(9.00 x 10²²) ÷ (6.022 x 10²³) = 0.15 moles

Convert 0.15 moles to grams.

For every mole, there is 24.31 g.

So we multiply by 24.31. Also note that I am using the number stored in the calculator and not the rounded number I put.

0.15 × 24.31 = 3.6

The mass of 9.00 x 10²² atoms of Mg is 3.6 grams.

Hope this helps!

8 0
3 years ago
WILL GIVE BRAINLIEST AND 20 POINTS!
Airida [17]

Answer:

Question

Explanation:

Identification of problem is the first scientific method. This is overtaken by asking questions

8 0
2 years ago
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