Straighterline CHEM101 General Chemistry I Graded Exam 3 (New Version June 2024) Questions with Detailed Verified Answers

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Straighterline CHEM101 General
Chemistry I Graded Exam 3 (New
Version June 2024) Questions with
Detailed Verified Answers

Question: total number of neutrons and protons in an atom; # protons + #
electrons
Answer: Mass Number


Question:Most nonmetallic elements are found in which block of the periodic
table?
Answer: p


Question:Ernest Rutherford disproved J.J. Thomson's plum-pudding model of
the atom by showing that...
Answer: Positive matter is concentrated in the central core


Question:Plants use up copious amounts of which alkali metal, preventing
most of it from being washed out to sea?
Answer: Potassium


Question:What is the ratio of reactants and products in the chemical
equation?


__NaOH + __H2SO4 --> __Na2SO4 + __H2O

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Answer: 2:1:1:2


Question:What is Avogadro's number?
Answer: the number of ATOMS in 12g of Carbon-12
1 g = 6.022 × 1023 amu


Question:What is the reducing agent in the following equation?


Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g)
Answer: Mg


Question:Which arrangement accurately describes the standard entropy
values at different phases?
Answer: (s) < (l) < (g)


Question:What are the most stable isotopes?
Answer: 2, 8, 20, 50, 82 or 126 protons


Question:What element has been oxidized and what element has been
reduced?


3CuS + 8HNO3 --> 3CuSO4 + 8NO + 4H2O
Answer: S = oxidized
N = reduced


Question:How do you convert from moles to grams?
Answer: multiply the atomic mass (grams) by the number of moles

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Question:How do you convert from grams to moles?
Answer: Divide the total number of grams by the atomic mass (grams) of 1
mole


Question:measure of the amount of matter
Answer: Mass


Question: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
Answer: Compound


Question:Definite shape and volume
Doesn't conform to shape of container
Particles are very close together in orderly fashion with little freedom of
motion
Answer: Solid


Question: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
Answer: Liquid


Question:No definite shape or volume
Conforms to shape and volume of container

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Particles separated by distances very large compared to size of particles
Answer: Gas


Question:Color, melting point, boiling point
Observed and measured without changing identity of substance
Answer: Physical Property


Question:Observed by performing a chemical change
Answer: Chemical Property


Question:Combination of 2+ elements, each retains its identity and properties
Can be separated by physical means into pure components without changing
identity of compounds
Answer: Mixture


Question:fixed composition and differs from a mixture (every sample has
same properties and composition)
Answer: Pure Substance


Question:molecule with a charge
contain more than 1 atom chemically bonded together
Answer: Polyatomic Ion


Question:atoms with charge formed by loss or gain of an electron
Answer: ions


Question:positive ion, may have roman numeral