CHEM 131 Exam 1 questions and answers| graded A
Celcius (degrees C) = Correct Answer: [(degrees F) - 32]/1.8
Kelvin (K) = Correct Answer: (degrees C) + 273.15
Law of Conservation of Mass Correct Answer: In a chemical reaction, matter is neither created
nor destroyed.
Law or Definite Proportions Correct Answer: All samples of a given compound, regardless of
their source or how they were prepared, have the same proportions of their constiuent elements.
The Law of Multiple Proportions Correct Answer: When two elements (call them A and B) form
two different compounds, the masses of element B that combine with 1 gram of element A can
be expressed as a ratio of small whole numbers.
Mass of an electron Correct Answer: 9.10 x 10^-28 g
Z = Correct Answer: Atomic number- number of protons
A = Correct Answer: Mass number- protons + neutrons
Group 1 Elements Correct Answer: alkali metals
Group 2 Elements Correct Answer: alkaline earth metals
Group 17 Elements Correct Answer: halogens
Avogadro's Number (mole) Correct Answer: 6.022 x 10^23
Naming binary compounds containing a metal that forms only one type of cation Correct
Answer: 1st- name of cation (metal)
2nd- base name of anion (non-metal) + -ide
Naming binary ionic compounds containing a metal that forms more than one kind of cation
Correct Answer: 1st- name of cation (metal)
2nd- charge of cation in roman numerals in parenthesis
3rd- base name of anion (non-metal) + -ide
Naming molecular compounds Correct Answer: 1st- prefix + name of first element
2nd- prefix + base name of second element + -ide
Naming binary acids Correct Answer: 1st- hydro
2nd- base name of nonmetal + ic
3rd- acid
Celcius (degrees C) = Correct Answer: [(degrees F) - 32]/1.8
Kelvin (K) = Correct Answer: (degrees C) + 273.15
Law of Conservation of Mass Correct Answer: In a chemical reaction, matter is neither created
nor destroyed.
Law or Definite Proportions Correct Answer: All samples of a given compound, regardless of
their source or how they were prepared, have the same proportions of their constiuent elements.
The Law of Multiple Proportions Correct Answer: When two elements (call them A and B) form
two different compounds, the masses of element B that combine with 1 gram of element A can
be expressed as a ratio of small whole numbers.
Mass of an electron Correct Answer: 9.10 x 10^-28 g
Z = Correct Answer: Atomic number- number of protons
A = Correct Answer: Mass number- protons + neutrons
Group 1 Elements Correct Answer: alkali metals
Group 2 Elements Correct Answer: alkaline earth metals
Group 17 Elements Correct Answer: halogens
Avogadro's Number (mole) Correct Answer: 6.022 x 10^23
Naming binary compounds containing a metal that forms only one type of cation Correct
Answer: 1st- name of cation (metal)
2nd- base name of anion (non-metal) + -ide
Naming binary ionic compounds containing a metal that forms more than one kind of cation
Correct Answer: 1st- name of cation (metal)
2nd- charge of cation in roman numerals in parenthesis
3rd- base name of anion (non-metal) + -ide
Naming molecular compounds Correct Answer: 1st- prefix + name of first element
2nd- prefix + base name of second element + -ide
Naming binary acids Correct Answer: 1st- hydro
2nd- base name of nonmetal + ic
3rd- acid
