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lesya [120]
3 years ago
15

What is co-wolent bond?​

Chemistry
1 answer:
alex41 [277]3 years ago
7 0

Answer:

Explanation:

This is a bond with reacts with metal's

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Determine the packing efficiency of a simple cubic unit cell that contains one atom with a metallic radius of 175 pm.
PilotLPTM [1.2K]

Answer:

the packing efficiency is 52.36%

Explanation:

Given the data in the question;

simple cubic unit cell that contains one atom with a metallic radius of 175 pm;

we know that;

Edge length of Simple cubic (a) is related to radius of atom (r) as follows;

a = 2r

since radius r = 175 pm

we substitute

a = 2 × 175 pm

a = 350 pm

Now we get the volume unit;

Volume of unit cell = a³ = ( 350 pm ) = 42875000 pm³

Next we get Volume of sphere;

Volume of Sphere = \frac{4}{3}πr³

Volume occupied by 1 atom = \frac{4}{3} × π × ( 175 pm )³

=  \frac{4}{3} × π × 5359375 pm³

= 22449297.5 pm³

Now, the packing efficiency = ( Volume occupied by 1 atom / Volume of unit cell ) × 100

we substitute;

packing efficiency = ( 22449297.5 pm³ / 42875000 pm³ ) × 100

= 0.523598 × 100

= 52.36%

Therefore, the packing efficiency is 52.36%

8 0
3 years ago
A student performs an exothermic reaction in a beaker and measures the temperature. If the thermometer initially reads 35 degree
Ksju [112]

Answer:

C

Explanation:

Exothermic means that heat is released from the reaction

7 0
2 years ago
PLEASE HELPPPPPPPPPPPPPP​
melamori03 [73]
It changes from a liquid from to a solid.

I hope this helps!
3 0
3 years ago
What are the purposes of theories in science?
Leto [7]

Answer:

Scientific theories are testable and make falsifiable predictions. They describe the causes of a particular natural phenomenon and are used to explain and predict aspects of the physical universe or specific areas of inquiry (for example, electricity, chemistry, and astronomy).

A good theory in the theoretical sense is (1) consistent with empirical observations; is (2) precise, (3) parsimonious, (4) explanatorily broad, and (5) falsifiable; and (6) promotes scientific progress (among others; Table 1.1).

5 0
4 years ago
12. Convert 600 mg to grams. Show your work.
nadya68 [22]

Answer:

600 milligrams=0.6 grams

Explanation:

1 milligram=0.001 grams and 1 gram= 1000 milligrams

So, to convert milligrams to grams, multiply the mg value by 0.001 or divide by 1,000.

Example:

If you want to know how many grams 300 mg is, you would divide 300 by 1,000, which would get you 0.3 grams.

4 0
3 years ago
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