Chapter E Basics
Order the answers for the following equations from most to least significant figures.
a) 34.5 + 670.04 =
b) 650000/352=
c) (127-72.1)/(5.500 x 2) =
What is...
a) 704.5
b) 185
c) 5
Find the density of a rubber ball with a mass of 3.6 grams and a density of 11 cm^3.
What is 40 g/cm^3
An element consists of two isotopes of masses 95.68 amu and 95.70 amu, with abundances of
67.42% and 32.58 %, respectively. Find the average atomic mass of this element in amu?
What is 95.69 amu?
Organize the following elements from highest to lowest # of electrons:
a) H+
b) F3-
c) Li2+
d) O-
What is F3-, O-, H+, Li2+
You find a concrete case buried in your backyard. The case weighs 17 kg and has a volume of 6.05 m. Convert these units to cg/km.
What is 2.8 x 10^8 cg/km ?
Find the weight of a trophy with density of 19.32 g/cm^3, and a volume of 18 in^3, in grams.
What is 5699 g?
Find the atomic masses of the two major isotopes of chlorine given that the percent abundance is 76.34% and 23.66%. The average atomic mass is 35.453.
What is 34.97 amu and 36.97 amu?
Find the # of neutrons for the following elements:
a) 29^Al
b) 62^Zn
c) 25^Mg
What is ...
a) 16
b) 32
c) 13
You have a sample of bacteria which includes a bacterium weighting 250 pg, one weighing 35 ug, one 3.567 x 10^4 fg, and one weighing 5463 ng. Find the average weight of these bacteria in ng.
What is
Find the volume of a stone with a weight of 320 g and a density of 26.2 g/cm^3
What is 12 cm^3?
Assume there are only 2 isotopes of uranium – 238U and 235U. Which isotope is more abundant? The average atomic mass is 239.05 amu.
What is 238U?
Explain the difference between an atom, a cation, an anion, and an isotope.
a) Atom- neutrally charged element
b) Cation- positively charged element
c) Anion- negatively charged element
d) Isotope- Element with differing # of neutrons compared to standard #.