Straighterline CHEM101 Final questions with answers

Straighterline CHEM101 Final questions
with answers

Mass Number - CORRECT ANSWERS ✔✔total number of neutrons and
protons in an atom; # protons + # electrons



p - CORRECT ANSWERS ✔✔Most nonmetallic elements are found in which
block of the periodic table?



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



Potassium - CORRECT ANSWERS ✔✔Plants use up copious amounts of
which alkali metal, preventing most of it from being washed out to sea?



2:1:1:2 - CORRECT ANSWERS ✔✔What is the ratio of reactants and products
in the chemical equation?



__NaOH + __H2SO4 --> __Na2SO4 + __H2O



the number of ATOMS in 12g of Carbon-12

1 g = 6.022 × 1023 amu - CORRECT ANSWERS ✔✔What is Avogadro's
number?

,Mg - CORRECT ANSWERS ✔✔What is the reducing agent in the following
equation?



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



(s) < (l) < (g) - CORRECT ANSWERS ✔✔Which arrangement accurately
describes the standard entropy values at different phases?



2, 8, 20, 50, 82 or 126 protons - CORRECT ANSWERS ✔✔What are the most
stable isotopes?



S = oxidized

N = reduced - CORRECT ANSWERS ✔✔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
ANSWERS ✔✔How do you convert from moles to grams?



Divide the total number of grams by the atomic mass (grams) of 1 mole -
CORRECT ANSWERS ✔✔How do you convert from grams to moles?



Mass - CORRECT ANSWERS ✔✔measure of the amount of matter

,Compound - CORRECT ANSWERS ✔✔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 ANSWERS ✔✔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 ANSWERS ✔✔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 ANSWERS ✔✔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 ANSWERS ✔✔Color, melting point, boiling
point

Observed and measured without changing identity of substance



Chemical Property - CORRECT ANSWERS ✔✔Observed by performing a
chemical change

, Mixture - CORRECT ANSWERS ✔✔Combination of 2+ elements, each retains
its identity and properties

Can be separated by physical means into pure components without changing
identity of compounds



Pure Substance - CORRECT ANSWERS ✔✔fixed composition and differs from
a mixture (every sample has same properties and composition)



Polyatomic Ion - CORRECT ANSWERS ✔✔molecule with a charge

contain more than 1 atom chemically bonded together



ions - CORRECT ANSWERS ✔✔atoms with charge formed by loss or gain of
an electron



Cation - CORRECT ANSWERS ✔✔positive ion, may have roman numeral



Anion - CORRECT ANSWERS ✔✔negative ion, element ends in -ide



isotope - CORRECT ANSWERS ✔✔atom of an element that has a different
mass because of a different number of neutrons, but same atomic number



Atomic Number - CORRECT ANSWERS ✔✔total number of protons in an
atom; also indicates number of electrons