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3 years ago

What are three things that the elements Magnesium, Calcium and Barium have in common?

Chemistry

1 answer:

Volgvan3 years ago

6 0

Answer:

1.They are all in the second group of the periodic table

2.They are an alkaline earth metal

3.They all have a shine to them

4.They are all highly reactive

5.They have a silver/white to them

6.They can all be found in the Earths crust

I'm not really sure of any others that they have in common and I thought to give extra so you could choose.

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A chemist measures the energy change ?H during the following reaction: 2HgO (s) ?2Hg (l) +O2 (g) =?H182.kJ Use the information t

Leni [432]

Answer:

The reaction is endothermic.

Yes, absorbed

3.06x10¹kJ are absorbed

Explanation:

In the reaction:

2HgO(s) → 2Hg(l) + O₂(g) ΔH = 182kJ

As ΔH >0,

<em>The reaction is endothermic</em>

<em />

As the reaction is endothermic, when the reaction occurs,

<em>the heat is absorbed.</em>

Now, based on the equation, when 2 moles of HgO (Molar mass: 216.59g/mol), 182kJ are absorbed.

72.8g are:

72.8g * (1mol / 216.59g) = 0.3361 moles HgO.

that absorb:

0.3361 moles HgO * (182kJ / 2 moles) =

<h3>3.06x10¹kJ are absorbed</h3>

8 0

3 years ago

Which gas is most abundant in Earth’s atmosphere?

scoundrel [369]

Answer:

Nitrogen

Explanation: nitrogen is around 70% of the air hope this helps god bless

3 0

3 years ago

Read 2 more answers

Draw a structural formula for trans-1-bromo-3-isopropylcyclobutane.

LUCKY_DIMON [66]

We have to draw the structural formula of trans-1-bromo-3-isopropylcyclobutane.

The structure is shown below in Figure1.

The molecule trans-1-bromo-3-isopropylcyclobutane has four atoms in the skeleton and Br atom is attached at 1 position and isopropyl group at 3-position.

Trans structure means both groups are in opposite directions.

5 0

3 years ago

How many atoms are in 15 grams of H2O

gulaghasi [49]

Answer:

5.014x10^23 atoms

Explanation:

first start with given over 1 so 15 over 1 then multiply that by 1 over 18.01528 and then multiply it by 6.022x10^23 over 1 which then gives you the answear hope this helps god bless

4 0

3 years ago

Question 096 Propose a three-step synthetic sequence to accomplish the transformation below. 1) HBr, ROOR; 2) t-BuOK; 3) CH3CH2C

salantis [7]

Complete Question

Question 096 Propose a three-step synthetic sequence to accomplish the transformation below.

Option 1 => 1) HBr, ROOR; 2) t-BuOK; 3) CH3CH2CCNa

Option 2 => 1) NaOEt; 2) HBr, ROOR; 3) CH3CH2CCNa

Option 3 => 1) t-BuOK; 2) NaNH2; 3) CH3CH2CCNa

Option 4 => 1) CH3CH2CH2CH2Br; 2) NaOEt; 3) HBr, ROOR

Option 5 => 1) t-BuOK; 2) HBr, ROOR; 3) CH3CH2CCNa

Option 6 => 1) NaOEt; 2) NBS, hν; 3) NaSBu

Answer:

The correct option is option 5

Explanation:

The mechanism of the reaction is shown on the first uploaded image

8 0

3 years ago