<span>Colbat (ii) which is a compound birth out of the combination of chlorine and colbat to form Cocl2.6h2o has water in it as we can see from it's chemical it's hexahydrate Anhydrous cobalt chloride as the word anhydrous clearly states , does not have water in</span>

8 0

4 years ago

Which would show an example of how physical changes are reversible?

dolphi86 [110]

C because it’s reshaping it, it stays the same but just reshaping it

6 0

3 years ago

a spherical sample has a mass of 2.813g. it has a diameter of 8.0mm. what is the sphere made of (determined by its density as g/

blondinia [14]

To determine the density, we use the following formula:

$density= \frac{mass}{volume}$

mass= 2.813 grams
volume= ?

we need to first calculate the volume before we can solve for the density. since the question states that the sample has a spherical shape, we can use the volume formula of spheres to find it.

$Sphere_{volume}= \frac{4}{3} \pi r^{3}$

radius (r)= $\frac{diameter}{2}$ = $\frac{8.0 mm}{2} = 4.0 mm$

let's plug in the values

V= $\frac{4}{3} \pi 4^{3} = 268 mm^3$

we need to change the $mm^3$ to $cm^3$ using the following conversion

1 cm= 10 mm
$268 mm^3 (\frac{1 cm}{10 mm} )^3 = 0.268 cm^3$

now we can find the density.

density= 2.813 grams/ 0.268 cm= 10.5 g/cm3

5 0

3 years ago