Ask question

Ask question

All categories

3 years ago

5

An atom of Calcium has 2 valence electrons and an atom of sulfur has 6 valence electrons. How many lone pairs of electrons are p

resent in the Lewis structure of Calcium Sulfide? one two three four none

1 answer:

Anarel [89]3 years ago

7 0

The answer is 2. this is what it would look like

:Ca = S:

Hope this helps

You might be interested in

What is the OH- ion concentration, in moles per liter, of an aqueous solution with a pH of 7?

topjm [15]

Answer:

B

Explanation:

the pH scale is based on the function

1x10-14

So since pH is neutral the concentration of OH and H must be equal hence the only option in which the concetration would [OH]{H}= 1x10-14 would be when both are equal so it cannot be a or d and when they are expressed in concetration so the only option is B.

3 0

3 years ago

How many moles are equal to 89.23 g of calcium nitrate?

DanielleElmas [232]

Answer:

23

Explanation:

6 0

2 years ago

In a certain industrial process involving a heterogeneous catalyst, the volume of the catalyst (in the shape of a sphere) is 10.

mamaluj [8]

Answer:

D

Explanation:

We know that the

reaction catalyzing power of a catalyst ∝ surface area exposed by it

Given

volume V1= 10 cm^3

⇒ $\frac{4}{3} \pi r^3= 10$

hence r= 1.545 cm

also, surface area S1= $4\pi r^2$

now when the sphere is broken down into 8 smaller spheres

S2= 8×4πr'^2

now, equating V1 and V2 ( as the volume must remain same )

$\frac{4}{3}\pi r^3=8\times\frac{4}{3} \pi r'^3$

and solving we get

r'= r/2

therefore, S2= $8\times4\pi\frac{r}{2}^2$

S2= $2\times4\pi r^2$

S2= 2S1

hence the correct answer is

. The second run has twice the surface area.

8 0

3 years ago

The density of aluminum is 2.7 g/mL if I add a piece of aluminum to a graduated cylinder of water in the water level increases b

viva [34]

The answer would be 5.5g because you have to subtract 8.2 minus 2.7 and you get 5.5g so basically the answer is C.

8 0

3 years ago

An analytical chemist is titrating 181.2 mL of a 0.09000M solution of diethylamine ((CH) NH) with a 0.5400M solution of HNO3. Th

gavmur [86]

Answer:

874 por que mi pen3 ne tu ocncha

Explanation:

mkmkm

8 0

2 years ago