Measurements
Write the following measurement in scientific notation:
780000km
7.8 x 105
True.
What are the charges of protons, neutrons, and electrons?
Protons: +
Neutrons 0
Electrons: -
Name an element in the same PERIOD as Lithium.
Be, B, C, N, O, F, or Ne.
What is the proper name for S2F6?
Disulfur Hexafluoride.
3. (0.00890)
What are two examples of the pure substances?
Elements and Compounds.
What is mass number?
BONUS: How is it different from atomic number?
BONUS: Atomic number is just the number of protons.
Which has the smallest atomic radii, Mg or S? Why?
Sulfur because the trend for atomic radii decreases from left to right (or across a period).
What is the formula for Nitrogen Trihydride?
NH3
Round 546378 to three significant figures.
546000
What is the density of a substance with a mass of 16.5g and a volume of 3.6mL?
4.58 g/mL
Which is the most dense: Electron Cloud or Nucleus? Why?
Nucleus, because it houses the protons and neutrons.
Is Na3P IONIC or COVALENT? Why?
Ionic because there is a metal and non-metal.
Name the four sublevels of electrons. (Hint: They are letters)
S, P, D, and F.
What is the volume of a rectangle with the dimensions of 5.78cm, 2.09cm, and 2.3 cm?
27.78 cm3
Is evaporation of alcohol a PHYSICAL or CHEMICAL change?
Physical change.
If two atoms are the same element, what must be the same?
The number of protons.
How many bonds does Carbon form? How do you know?
Carbon can form 4 bonds because it has 4 valence electrons!
Identify the element: 1s22s2
Use dimensional analysis to convert 2.6 days into seconds.
224,640 seconds.
If a piece of wood with a density of 10.00g/cm3 is cut in half, what is the density of each piece of wood? Why?
10, because density is an intensive property.
Identify the atomic number, number of protons, neutrons, and electrons for Boron-13.
Atomic #/ # of Protons: 5
Mass #: 13
Neutrons: 8
Electrons: 5
Draw the Lewis Structure and name the VSEPR shape for H2O
Oxygen with 2 lone pairs and 2 single bonds to Hydrogen.
According to the Aufbau Diagram, how many electrons occupy the 3p orbital for SULFUR?
4 electrons, because Sulfur has the noble gas electron configuration of [Ne] 3s23p4