Unit 1/2
Convert to real notation
7.25 x 103
2.65 x 10-4
7250
0.000265
Rutherford’s gold-foil experiment led to the discovery of what subatomic particle?
Proton (also nucleus)
The formula for an ionic compound with beryllium and phosphate is:
Be2+ PO43-
Be3(PO4)2
During the condensing of a liquid, the kinetic energy _____ and the potential energy ______.
stays the same
decreases
380 mmHg = ______atm
0.5 atm
If an object has a mass of 6.45 g and a density of 3.67 g/mL, what is its volume?
1.76 mL
Of the following, select the atom with the smallest atomic radius: Na, Al, Si, S, Cl
Cl
Name that compound:
PCl5
Phosphorus Pentachloride
Rank the states of matter from slowest to fastest particle speed.
Solid, liquid, gas
Find the total pressure for a mixture that contains four gases with partial pressures of 1.23 kPa, 4.56 kPa, 7.89 kPa and 8.64 kPa.
22.32
What are the steps of the scientific method?
Make an observation
Form a hypothesis
Conduct an experiment
Collect and analyze data
Draw conclusions
32P3–
Predict the number of protons, neutrons, and electrons
15, 17, 18
What is the strongest IMF between two molecules of PF3?
dipole-dipole
What are the two main points of the Kinetic Molecular Theory?
1.All matter is composed of very small particles
2.These particles are in constant, random motion
What is the number of moles of a gas at 0.150 L, 99°C and 107 kPa?
0.005
Solve, round to the correct number of significant figures:
77.32 x 20
2.45 x 14
1546.4 = 2000
34.3 = 34
If a photon has an energy of 9.50 x 10-19 J, what is its wavelength?
209 nm
H2, N2, CO2, CO, HF, BaCl2
What state of matter?
Matter with definite shape and volume.
Solid
If the molar mass of B is four times larger than the molar mass of A, what is the ratio of diffusion rates for A and B?
two times
A 35 g sample of an unknown metal is heated in boiling water until equilibrium is reached. It is then placed in 100 mL of water that is at 20 C. If the two reach a final temperature of 24.7 C, what is the specific heat of the metal?
0.75 J/gC
Chlorine (Cl) has two isotopes, chlorine-35(amu= 34.969) & chlorine-37(amu=36.966). The average atomic weight of chlorine is 35.4527 amu. Determine the percent abundance of each isotope. Answer should be given to the hundredths place.
% chlorine – 35 = 75.78%
% chlorine – 37 = 24.22%
Name that compound:
Fe(OH)2
Iron (II) hydroxide
Specific Heat, c:
H2O (g) = 2.02 J/goC
H2O (l) = 4.18 J/goC
H2O (s) = 2.06 J/goC
Heat of fusion, Hfus= 333.55 J/g
Heat of vaporization, Hvap = 2260 J/g
A 20 g block of ice at –30oC is heated until all the water boils to steam. The heat required to raise the temperature of the liquid water from 0.0oC to 100.0oC
How much total heat was needed to change the block of ice to all steam?
61,467 J
A sample of nitrogen gas is stored in a 0.50 L flask at STP. The gas is transferred to a 0.750 L flask at 75 kPa. What is the temperature of nitrogen in the second flask?
303.2