CHEM 111 Final Exam UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS
Heterogenous mixture Mixture not uniform throughout
Homogenous mixture Mixture that is uniform throughout. It has variable composition
Pure substance Mixture that is uniform throughout. Does not have variable composition
, Celsius to Kelvin +273.15
Celsius to Fahrenheit 9/5(C) + 32
Fahrenheit to Celsius 5/9(F-32)
Density eq Mass/Volume (kg/L or kg/m)
Significant figures in addition/subtraction The number of decimal places in the least accurate measurement
Significant figures in multiplication/division The number of significant figures in the least precise measurement
Significant figures zero rules Zeros at the beginning of a number are never significant and zeros at the end of a
number are significant if a decimal point is written in the number
Accuracy Proximity of measurements to the true value
Precision Proximity of several measurements to each other
What is the top number in the element symbol? Mass number (protons + neutrons)
What is the bottom number in the element symbol? Atomic number (protons or electrons)
Isotope Atoms of the same element with different masses (number of neutrons changes)
Average atomic mass Sum of isotope mass x natural abundance
Period Horizontal
Group Vertical
Where are nonmetals on PT Right side (including H)
Where are metals on PT Left side
What does subscript of an element tell you The number of atoms of that element in one molecule
What is the spectrum of oxyanions from fewest to most hypo__ite, __ite, __ate, per__ate
What does __ide turn into in acid nomenclature hydro__ic acid
Heterogenous mixture Mixture not uniform throughout
Homogenous mixture Mixture that is uniform throughout. It has variable composition
Pure substance Mixture that is uniform throughout. Does not have variable composition
, Celsius to Kelvin +273.15
Celsius to Fahrenheit 9/5(C) + 32
Fahrenheit to Celsius 5/9(F-32)
Density eq Mass/Volume (kg/L or kg/m)
Significant figures in addition/subtraction The number of decimal places in the least accurate measurement
Significant figures in multiplication/division The number of significant figures in the least precise measurement
Significant figures zero rules Zeros at the beginning of a number are never significant and zeros at the end of a
number are significant if a decimal point is written in the number
Accuracy Proximity of measurements to the true value
Precision Proximity of several measurements to each other
What is the top number in the element symbol? Mass number (protons + neutrons)
What is the bottom number in the element symbol? Atomic number (protons or electrons)
Isotope Atoms of the same element with different masses (number of neutrons changes)
Average atomic mass Sum of isotope mass x natural abundance
Period Horizontal
Group Vertical
Where are nonmetals on PT Right side (including H)
Where are metals on PT Left side
What does subscript of an element tell you The number of atoms of that element in one molecule
What is the spectrum of oxyanions from fewest to most hypo__ite, __ite, __ate, per__ate
What does __ide turn into in acid nomenclature hydro__ic acid
