Chemistry Test 1
84 neutrons
a commonly occurring isotope of tin is tin-118, while most oxygen occurs in nature as oxygen-16. a molecule of tin (IV) oxide formed from these isotopes contains
2.4 x 10^6
2.4 km is how many millimeters?
ionic
CsF
molecular
H2O
ionic
Na3(PO4) Li3(PO4)
molecular
SeO2
10^-3 and 10^9 10^-9
The SI prefixes milli- and giga- represent, respectively. nano?
316 L 84*4= 336 336/1.04 = 316L
a barrel of oil contains 84.0 gallons. how many liters is this? (1L=1.06qt, 4qts=1gal)
5 protons and 2 electrons, 13 protons and 10 electrons 26 Al 3+ 13 ........ 13-3 = 10
a boron ion, B^3+, has an aluminum ion, Al^3+ has
hypothesis
a botanist guesses, but has not verified, that plants with one red-flowered and one white-flowered parent will have pink flowers. this is an example of a ...
(-33.4 + 273.15) = 239.75
ammonia boils at -33.4 degrees Celsius. what temperature is this in k?
isotopes
atoms of the same element with different mass numbers are called
.000045 Km
convert 45 mm to km
Co2 = dioxide CTe2 = telluride
formula for carbon dioxide? carbon ditelluride?
17 p, 17 e, 18 n 35-17 = 18
give the number of protons (p), electrons (e), and neutrons (n) in one atom of chlorine-35.
2
how many significant figures does the product 9.52010x7.9 contain?
$28.47
in a certain city, electricity costs $0.16 per Kwatt x hour ($0.16/(kwatt x hr)). what is the annual cost for electricity to power a lamp-post for 6.5 hours per day with a 75 watt light bulb?
magnesium perchlorate
the chemical name for ClO4- is "perchlorate ion". therefore, the name of Mg(ClO4)2 is
1.29 cm^3
the density of pure gold is 19.3 g/cm^3 at 25 degrees Celsius. calculate the volume (in cm^3) occupied by 25.0 g of pure gold. D=M/V
1x10^-1 nm
the diameter of an atom is approximately 1x10^-8 cm. what is this diameter when expressed in nano-meters?
3
the number 4.05x10^9 has how many significant figures?
MnO2 = manganese (IV) oxide MnO4 = manganese (VIII) oxide
the systematic name for: MnO2? MnO4?
group 18
what group are the noble gases located?
alkaline earth metals = group 2 alkaline metals = group 1
what group is the alkaline earth metals located? & alkaline metals?
46.802 1).Make the abundance a decimal (73.300% = .733) 2). Then multiply it to the amu. (.733*45.95263 = 33.6). 3). Add all these numbers you get, together to get answer.
what is the average atomic mass of titanium on that planet? How do you do it?
radioactive decay produces new elements from nature
which of the following is not a postulate of Dalton's atomic theory?
Cl2 and I2
which of these diatomic elements are halogens?
Robert Millikan = charge JJ Thompson = discovery
which scientist is responsible for the discovery of the charge on the electron? What about for discovering the electron?
