Chemistry short answer questions for midyear Exam 100% Updated!!

Chemistry short answer questions for
midyear Exam 100% Updated!!

Calculate the average atomic mass of element X if the percentage is abundant isotopes are as follow
X-12 is 98.5% X-13 is 1% X-14 is 0.5% - ANSWER Average Atomic Mass = 12 X 98.5 + 13 X 1 + 14 X
0.

= 12.02 AMU



Calculate the mass of metallic cuboid with measurements 5cm, 3cm, and 1cm, if its density is
19.8g/ml (D = M/V) - ANSWER V = 5 X 3 X 1 = 15cm^3

M = D X V = 19.8 X 15 = 297g



How many milligrams are in 0.0000454 grams - ANSWER 0.0000454g X 1000mg/1g



= 0.0454mg



Draw the electron configuration of following elements:

Li: Atomic N: 3, Mass: 7

Si: Atomic N: 14 Mass: 28

Ar: Atomic N 18. Mass: 40

Ca: Atomic N 20 Mass: 40 - ANSWER Li P+ 3.

N 4. ) )

21

Si P+ 14

N. 14. ) ) )

284

Ar P+ 18

N 22. ) ) )

288

Ca P+ 20

N 20 ) ) ) )