Science NLN practice questions (Answered) 2022 update. Graded A+
To be isotopes, two atoms of the same element must have a different
number of
(A) neutrons.
(B) protons.
(C) electrons.
(D) quarks. - ✔✔(A) neu
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Science NLN practice questions (Answered) 2022 update. Graded A+
To be isotopes, two atoms of the same element must have a different
number of
(A) neutrons.
(B) protons.
(C) electrons.
(D) quarks. - ✔✔(A) neutrons.
Depending on its environment, a substance that can act as either an acid
or a base is described as
(A) amphoteric.
(B) an isomer.
(C) hydrolytic.
(D) a polymer. - ✔✔(A) amphoteric.
A certain substance is not broken down in a chemical reaction. The substance
is most likely
(A) a compound.
(B) an aqueous solution.
(C) an element.
(D) a heterogeneous mixture. - ✔✔(C) an element.
A hydrogen ion concentration of 1 × 10−7 M in a solution is considered
(A) basic.
(B) alkali.
(C) acidic.
(D) neutral. - ✔✔(D) neutral.
The radioactive isotope I-131 has a half-life of 8 days. What fraction of
a sample of I-131 will remain after 24 days?
(A) 1⁄4
(B) 1⁄16
(C) 1⁄8
(D) 1⁄2 - ✔✔(C) 1⁄8
Which of the following particles/rays is not a type of radioactive emanation?
(A) alpha particle
(B) beta particle
(C) gamma ray
(D) carbon-12 - ✔✔(D) carbon-12
The strongest acid can be found in which of the following pH ranges?
(A) 11.1−12
(B) 7.1−8.2
(C) 4.5−5.7
(D) 1.0−2.0 - ✔✔(D) 1.0−2.0
The symbol K on the periodic table stands for
(A) potassium.
(B) calcium.
(C) carbon.
(D) phosphorus. - ✔✔(A) potassium.
Which of the following reactions releases heat energy?
(A) double replacement
(B) decomposition
(C) endothermic
(D) exothermic - ✔✔(D) exothermic
Which gas law states that the volume of a gas is inversely proportional
to the pressure?
(A) Ideal Gas Law
(B) Boyle's Law
(C) Combined Gas Law
(D) Charles' Law - ✔✔(B) Boyle's Law
What type of bond is created when bromine and magnesium are reacted
to form MgBr2?
(A) polar covalent
(B) metallic
(C) ionic
(D) nonpolar covalent - ✔✔(C) ionic
Which of the following wavelengths of visible light is best absorbed
by chlorophyll?
(A) 300nm
(B) 495nm
(C) 665nm
(D) 550nm - ✔✔(C) 665nm
The xylem vessels of a plant are responsible for carrying
(A) water up through the plant.
(B) light energy to the leaves.
(C) chlorophyll to the leaves.
(D) oxygen into the leaves. - ✔✔(A) water up through the plant.
When placed in distilled water, a human red blood cell
(A) shrivels up.
(B) neither shrinks nor swells.
(C) takes up more salts to balance all concentrations.
(D) swells to a larger size. - ✔✔(D) swells to a larger size.
During plant cell replication, the division of the cytoplasm is called
(A) cytohydrolysis.
(B) cytokinesis.
(C) plasmolysis.
(D) cytoplasmosis. - ✔✔(B) cytokinesis.
Which of the following are classified as animals that eat only meat?
(A) carnivores
(B) herbivores
(C) decomposers
(D) consumers - ✔✔(A) carnivores
In which phase of mitosis do the chromosomes line up?
(A) interphase
(B) metaphase
(C) prophase
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