Straighterline Chemistry Final Exam (ACTUAL) 2023/2024 Questions and Answers

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 - Answer 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 - Answer 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 - Answer 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 - Answer 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. - Answer 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 - Answer 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 - Answer 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 - Answer 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 - Answer 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 - Answer b. 126 Which of these elements is chemically similar to magnesium? Select one: a. Sulfur b. Calcium c. Iron d. Nickel e. Potassium - Answer 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. - Answer 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. - Answer 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 - Answer 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 - Answer d. Ca2NO3 What is the name of ClO - ion? Select one: a. hypochlorite b. chlorate c. chlorite d. perchlorate e. perchlorite - Answer 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. - Answer 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. - Answer d. [Xe]4f145d106s1 A(n) _________ is a point at which a standing wave has zero amplitude. Select one: a. crevice b. node c. pit d. burrow e. orbital - Answer b. node