CHEM 100 TEST 1 UPDATED QUESTIONS AND ANSWERS

CHEM 100 TEST 1 UPDATED QUESTIONS AND ANSWERS
The atomic number for Potassium is:

A. 19

B. 30.97

C. 15

D. 39.0983 - CORRECT ANSWER✅✅A. 19



When elements combine to form compounds,



A. their properties are an average of all elements in the compound.

B. their properties do not change.

C. their properties are completely random.

D. their properties change completely.

E. none of the above - CORRECT ANSWER✅✅D. their properties change completely.



What is the formula for an ionic compound made of magnesium and sulfur?



A. MgS2

B. Mg2S3

C. MgS

D. Mg2S

E. none of the above - CORRECT ANSWER✅✅C. MgS



Which of the following elements has the highest ionization energy?

A. Ne

B. Ba

C. Ca

D. Al

, E. Cl - CORRECT ANSWER✅✅A. Ne



When an electron absorbs energy, it may move from ____________ energy level to ___________
energy level.



A. turns into an atom

B. higher , lower

C. lower , higher - CORRECT ANSWER✅✅C. lower , higher



What is the atomic symbol for tin?

A. Sn

B. Tn

C. Ti

D. Si

E. none of the above - CORRECT ANSWER✅✅A. Sn



What is the correct chemical symbol for mercury?



A. My

B. Hy

C. Me

D. Hm

E. none of the above - CORRECT ANSWER✅✅E. none of the above



Group 2A elements are also called:



A. noble gases.

B. alkali metals.

C. alkaline earth metals.