ch1
What are the SI units for mass, time, length, temperature, and quantity/amount?
mass: kilograms
time: seconds
length: meters
temperature: kelvin
quantity/amount: mole
What did Millikan, Rutherford, and J.J. Thompson contribute to discovery of atom.
Millikan- charge of electron (something time 10-19)
Rutherford- gold foil experiment which used alpha particles and determined nucleus is positively charged and atoms are mostly empty space
J.J. Thompson- did cathode ray experiment which showed that electrons are negatively charged
Sarin is a toxic nerve gas that has a molecular formula of C4H10PO2F. Determine the percent composition of each element in Sarin.
34.29% C, 7.20% H, 22.11% P, 22.84% O, and 13.56% F
How many atoms of carbon are in 50.4 grams of carbonic acid?
4.89 x 1023 atoms of carbon
What is the skeleton equation/reaction for combustions of hydrocarbons?
AND
What are all the diatomic elements?
CxHy + O2 → CO2 + H2O
and
H2, N2, O2, I2, Cl2, Br2, F2
What is difference between intensive and extensive properties and what is an example of each?
AND
What is the difference between accuracy and precision
Intensive is a mass independent property; ex: density, melting point. Extensive is a mass dependent property; ex: mass, moles, volume
Accuracy refers to how close you get to the true or accepted value. Precision refers to how close measurements are to each other
What are the charges and elemental symbols for silver, aluminum, and aluminum?
Silver: Ag+
Zinc: Zn2+
Aluminium: Al3+
What mass of hydrogen gas will be required to release 4.53 x 105 J of heat in the following reaction?
C5 + 6 H2 → C5H12 ∆-145.7kJ
It will take 37.6 grams of hydrogen gas.
Molarity is a unit of moles of solute per liter of solution. The unit is (mol/L). Calculate the concentration of ions in an aqueous solution of 2.0M sodium sulfate that completely dissociates into its ions.
[Na+]= 4.0M
[SO42-]= 2.0M
Calculate the atomic mass of Mg given the following isotopes
24Mg, 23.98504 amu, 78.70%
25Mg, 24.98584 amu, 10.13%
26Mg, 25.98529 amu, 11.17%
24.30985 amu
how many sig figs are in each of the following
a) 00.03456 b)90000. c) 24500
d) 0.00023400 e) 6.022 x 1023
a) 4
b) 5
c) 3
d) 5
e) 4
what are the three types of radiations and what are their charges? Also rank their weight from highest to lowest.
beta: negative, gamma: no charge, alpha: positive
alpha>beta>gamma
There are 253.8 grams of iodine gas in a given container. How many atoms are in this container?
There are 1.204 x 1024 atoms present in the container
I will give each of you a piece of paper for this question since it cannot fit on on the screen. Your final answer written should be a, b, c, or d.
D
In terms of chemical and physical properties, is potassium more related to strontium, calcium, or rubidium. Why?
rubidium because they are in same group/ same valence electrons
convert 732 yards to miles
0.416 miles
True or False: All atoms of carbon are identical. Explain.
False because isotopes exist.
60.8 g of lead (II) nitrate and 15.3 g of sodium chloride react to form sodium nitrate and lead (II) chloride
What is the excess reactant and how much of it is left over after the reaction is complete?
Pb(NO3)2 / lead(II) nitrate is the limiting reactant and 17.4 g of it is leftover after the reaction is complete
How many grams of oxygen are present in 0.512 L of phosphoric acid? The density of phosphoric acid is 1.88 g/cm3
There are 629 grams of oxygen present
What structure do ionic compounds have?
AND
Which subatomic particle(s) mainly gives element's their chemical and physical properties?
Lattice crystal structure
and
electrons
For objects near the surface of the earth, the gravitational acceleration is a constant equal to 9.8 meters per second squared. What is this expressed in miles per hour squared? Round to 2 decimal places
78919.11 mi/hr2
How many electrons, protons, and neutrons are in
3He2+
Protons: 2
electrons: 0
neutrons: 1
The molecular formula of Dianabol, which consists of carbon, hydrogen, and oxygen, can be determined using the data from two different experiments. In the first experiment, 14.765 g of Dianabol is burned, and 43.257 g CO2 and 12.395 g H2O are formed. In the second experiment, the molecular mass of Dianabol is found to be 300.44. What is the molecular formula for Dianabol?
molecular formula of dianabol is C20H28O2
When 10.0 g of aluminum sulfite react with 10.0 grams of sodium hydroxide, aluminum hydroxide and sodium sulfite are products. What is the maximum mass of aluminum hydroxide that can be made?
5.30 grams of Al(OH)3
copper (II) sulfate __ hydrate was heated to remove water. The following data was obtained:
Mass of crucible: 2.20 g
Mass of crucible and content before heating: 14.70 g
Mass of crucible and content after heating: 10.20 g
What is the formula and name of this hydrate?
CuSO4 • 5H2O
copper (II) sulfate pentahydrate