Science NLN practice questions (Answered) 2022 update. Graded A+

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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 [Show More]

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