CH 1
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 J.J. Thompson contribute to discovery of atom.
Rutherford- 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. What is the molecular weight of Sarin?
140.09 g/mol
what is wavelength?
Wavelength is defined as the total distance covered to complete one wave.
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+
Molar mass of C₆H₁₂O₆
180.156 g/mol
What is frequency?
Frequency is defined as the number of complete wave cycles per second.
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 did rutherford contribute to the discovery of the atom?
Rutherford- determined nucleus is positively charged and atoms are mostly empty space
what is the difference between an ion and an isotope?
An isotope is an atom that has the same number of protons but a different number of neutrons. An ion is an electrically charged particle produced by either removing electrons from a neutral atom to give a positive ion or adding electrons to a neutral atom to give a negative ion.
where are electrons located in an atom?
Electrons are found in shells or orbitals that surround the nucleus of an atom
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
Which subatomic particle(s) mainly gives element's their chemical and physical properties?
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
molecular formula of dianabol is C20H28O2
what is the molar mass?
300.4412 g/mol
What structure do ionic compounds have?
Lattice crystal structure