Straighterline CHEM101 Final Exam Questions With 100% Correct And Verified Answers | Latest Update 2026/2027 (Graded A+)

Straighterline CHEM101 Final Exam Questions With 100% Correct And Verified Answers | Latest Update 2026/2027 (Graded A+) Mass Number - Correct Answer-total number of neutrons and protons in an atom; # protons + # electrons p - Correct Answer-Most nonmetallic elements are found in which block of the periodic table? Positive matter is concentrated in the central core - Correct AnswerErnest Rutherford disproved J.J. Thomson's plum-pudding model of the atom by showing that... __NaOH + __H2SO4 -- __Na2SO4 + __H2O the number of ATOMS in 12g of Carbon-12 1 g = 6.022 × 1023 amu - Correct Answer-What is Avogadro's number? Mg - Correct Answer-What is the reducing agent in the following equation? Mg(s) + 2HCl(aq) - MgCl2(aq) + H2(g) (s) (l) (g) - Correct Answer-Which arrangement accurately describes the standard entropy values at different phases? 2, 8, 20, 50, 82 or 126 protons - Correct Answer-What are the most stable isotopes? S = oxidized N = reduced - Correct Answer-What element has been oxidized and what element has been reduced? 3CuS + 8HNO3 -- 3CuSO4 + 8NO + 4H2O multiply the atomic mass (grams) by the number of moles - Correct Answer-How do you convert from moles to grams? Divide the total number of grams by the atomic mass (grams) of 1 mole - Correct Answer-How do you convert from grams to moles? Potassium - Correct Answer-Plants use up copious amounts of which alkali metal, preventing most of it from being washed out to sea? 2:1:1:2 - Correct Answer-What is the ratio of reactants and products in the chemical equation? Mass - Correct Answer-measure of the amount of matter Compound - Correct Answer-made from atoms of 2+ elements that are chemically bonded; cannot be separated into simpler substances by any physical process; can be separated by a chemical reaction Solid - Correct Answer-Definite shape and volume Doesn't conform to shape of container Particles are very close together in orderly fashion with little freedom of motion Liquid - Correct Answer-Definite volume, indefinite shape Conforms to shape of the part of the container it fills Particles are close together but not rigidly in position with freedom to move past each other Gas - Correct Answer-No definite shape or volume Conforms to shape and volume of container Particles separated by distances very large compared to size of particles Physical Property - Correct Answer-Color, melting point, boiling point Observed and measured without changing identity of substance Pure Substance - Correct Answer-fixed composition and differs from a mixture (every sample has same properties and composition) Polyatomic Ion - Correct Answer-molecule with a charge contain more than 1 atom chemically bonded together ions - Correct Answer-atoms with charge formed by loss or gain of an electron Cation - Correct Answer-positive ion, may have roman numeral Anion - Correct Answer-negative ion, element ends in -ide isotope - Correct Answer-atom of an element that has a different mass because of a different number of neutrons, but same atomic number Atomic Number - Correct Answer-total number of protons in an atom; also indicates number of electrons Catalyst - Correct Answer-additional reactant that increases the rate of a reaction with a lower activation energy Surface area Concentration Temperature Catalyst - Correct Answer-What 4 factors impact the rate of a reaction? exothermic reaction - Correct Answer-A reaction that RELEASES energy in the form of heat endothermic reaction - Correct Answer-A reaction that ABSORBS energy in the form of heat Chemical Property - Correct Answer-Observed by performing a chemical change Mixture - Correct Answer-Combination of 2+ elements, each retains its identity and properties Can be separated by physical means into pure components without changing identity of compounds 6.022 x 10^23 particles - Correct Answer-How many particles/atoms/molecules are in a mole? Amount of area exposed for the reaction of a solid - Correct AnswerSurface area impacts rate of reaction how?