Straighterline Chemistry Final Exam/ 258 Questions and Answers Already Passed 100% Accurate!!

Straighterline Chemistry Final Exam/
258 Questions and Answers Already
Passed 100% Accurate!!
What is the term used for findings that are summarized based on
a pattern or trend?
a. Law
b. Hypothesis
c. Theory
d. Phenomena
e. Prediction - -a. Law

-Which of the following is a tentative explanation for a set of
observations?
Select one:
a. Law
b. Hypothesis
c. Theory
d. Phenomena
e. Prediction - -b. Hypothesis

-If a liquid contains 60% sugar and 40% water throughout its
composition then what is it called?
Select one:
a. Solute
b. Compound
c. Homogeneous mixture
d. Heterogeneous mixture
e. Solvent - -c. Homogeneous mixture

-Which of the following does not have a uniform composition
throughout?
Select one:
a. Element
b. Compound
c. Homogeneous mixture
d. Heterogeneous mixture
e. Solvent - -d. Heterogeneous mixture

, -Which one of these represents a physical change?
Select one:
a. Water, when heated, forms steam.
b. Bleach turns hair yellow.
c. Sugar, when heated, becomes brown.
d. Milk turns sour.
e. Apples, when exposed to air, turn brown. - -a. Water, when
heated, forms steam.

-How many micrograms are in 65.3 kg?
Select one:
a. 0.653 μg
b. 6.53 × 107 μg
c. 6.53 × 104 μg
d. 6.53 × 10-8 μg
e. 6.53 × 1010 μg - -e. 6.53 × 1010 μg

-A smart phone has dimensions of 4.9 inches (height), 2.3 inches
(width) and 8.0 millimeters (depth). What is the volume of the
smart phone in cubic centimeters? (1 in = 2.54 cm)
Select one:
a. 58 cm3
b. 1.7 x 105 cm3
c. 90 cm3
d. 3.4 cm3
e. 34 cm3 - -a. 58 cm3

-Given that 1 inch = 2.54 cm, 1.00 cm3 is equal to
Select one:
a. 16.4 in3
b. 6.45 in3
c. 0.394 in3
d. 0.155 in3
e. 0.0610 in3 - -e. 0.0610 in3

-What terms defines a mass which is exactly equal to 1/12 the
mass of one carbon-12 atom?

,Select one:
a. Isotope number
b. Mass number
c. Mass-to-charge ratio
d. Atomic number
e. Atomic mass unit - -e. Atomic mass unit

-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