STRAIGHTERLINE CHEMISTRY FINAL EXAM PREP QUESTIONS AND CORRECT ANSWERS GRADED A+

STRAIGHTERLINE CHEMISTRY FINAL EXAM
PREP 2026-2027 QUESTIONS AND CORRECT
ANSWERS GRADED A+

How many neutrons are there in an atom of lead whose mass number is 208?
Select one:
a. 82
b. 126
c. 208
d. 290
e. none of them
b. 126




Which of these elements is chemically similar to magnesium?


Select one:
a. Sulfur
b. Calcium
c. Iron
d. Nickel
e. Potassium
b. Calcium

,C(graphite) and C(diamond) are examples of:


Select one:
a. isotopes of carbon.
b. allotropes of carbon.
c. the law of definite proportions.
d. different carbon ions.
b. allotropes of carbon.




The 80Br- ion has


Select one:
a. 45 protons, 35 neutrons, 45 electrons.
b. 35 protons, 45 neutrons, 34 electrons.
c. 35 protons, 45 neutrons, 36 electrons.
d. 45 protons, 35 neutrons, 46 electrons.
e. 35 protons, 45 neutrons, 46 electrons.
e. 35 protons, 45 neutrons, 46 electrons.




The formula for sodium sulfide is
Select one:
a. NaS
b. K2S

,c. NaS2
d. Na2S
e. SeS
d. Na2S




Which one of the following formulas of ionic compounds is the least likely to be
correct?
Select one:
a. NH4Cl
b. Ba(OH)2
c. Na2SO4
d. Ca2NO3
e. Cu(CN)2
d. Ca2NO3




What is the name of ClO - ion?
Select one:
a. hypochlorite
b. chlorate
c. chlorite
d. perchlorate
e. perchlorite
a. hypochlorite

, Which of the following is a molecular formula for a compound with an empirical
formula of CH?
Select one:
a. C2H6
b. C3H9
c. C4H10
d. C6H6
e. None of the answers is correct.
d. C6H6




Which is the correct electron configuration for gold?


Select one:
a. [Xe]4f145d96s2
b. [Xe]4f145d106s2
c. [Xe]4f135d106s2
d. [Xe]4f145d106s1
e. None of the electron configurations is correct.
d. [Xe]4f145d106s1


Which of the following is a tentative explanation for a set of observations?
Select one:
a. Law
b. Hypothesis