The Atoms Family
What are the charges of the subatomic particles: a proton, a neutron, an electron?
Proton - positive charge
Neutron - neutral charge
Electron - negative charge
An ion is the gain or loss of this subatomic particle
electrons
Indicate how many significant figures there are for each of the following numbers:
0.00340
14.600
700000
0.00340 - 3 significant figures
14.600 - 5 significant figures
700000 - 1 significant figures
Lucky Charms
Heterogeneous Mixture
The density of an object is...
mass divided by volume
Which of the following is an alkaline earth metal?
a. Magnesium
b. Sodium
c. Aluminum
d. Carbon
a. Magnesium
This group on the periodic table do NOT form ions. In fact, these elements always have a charge of zero.
Noble Gases (Group 18)
(32.567 + 135.0 + 1.4567)
169.0
Water (H2O)
Compound & Pure Substance
In the water displacement method for finding volume,
a) You subtract the final volume from the initial volume
b) You subtract the initial volume from the final volume
c) You add the initial and final volumes
d) You divide the final volume by 2
b) You subtract the initial volume from the final volume
Isotopes of the same element have the same number of this subatomic particle
Neutrons
Will metals lose or gain electrons? Justify your response
They will LOSE electrons because this requires LESS ENERGY than gaining electrons.
45.76 x 0.25
11
Air
Homogeneous Mixture
If you cut a wooden block in half, each half would have
a) Half the density of the original piece
b) Twice the density of the original piece
c) The same density as the original piece
d) No density at all
c) The same density as the original piece
How many electrons would boron need to gain/lose to become an ion?
B+3
With 19 protons and 18 electrons, identify the element, symbol, atomic number, and mass number.
Element: Potassium
Symbol: K+
Atomic Number: 19
Mass Number: 39
Complete the calculations giving the answer in scientific notation with correct sig figs and units.
9.15x1023 cm x 3.23x1016 cm =
2.96 x 1040 cm2
Salt Water
Homogeneous Mixture
What volume of silver metal will weigh exactly 2500.0 g. The density of silver is 10.5 g/cm3. Show the final answer with the correct amount of significant figures, units, and in scientific notation.
2.38 x 102 cm3
The atomic number will always equal the number of this subatomic particle.
Protons
What is the difference between ionic and molecular compounds?
Ionic compounds contain a metal and a nonmetal. Whereas, molecular compounds only contain nonmetals.
How many significant figures are in the following number?
0.0050010
5
N2
Element & Pure Substance
Is density considered an intensive or extensive property? Justify your response.
Intensive because density does not depend on the amount of matter present.