Download Chem 1st Sem Rev Ch2

Chemistry – First Quarter CRT Review
Classifying Matter (Ch2)
1. Classify these as elements, compounds, or mixtures. If mixture, decide if heterogeneous or homogeneous.
a. silver
b. pine tree
c. orange juice d. carbon dioxide
e. air
2. Classify each of the following changes as physical or chemical.
a. bread is baked
b. salt dissolves in water c. milk spoils
d. A snowflake melts
The Atom and Nuclear Processes (Ch4,25)
1. What is the charge, positive or negative, of the nucleus of every atom?
2. Determine the number of neutrons in each atom.
a. nitrogen-15
b. radium-226
3. List the number of protons, neutrons, and electrons in each of the following atoms.
a. 2713Al
b. 4420Ca
4. Tell how alpha, beta and gamma radiation are distinguished on the basis of the following:
a. mass
b. charge
c. penetration power
5. Complete these nuclear reactions:
a. 3015P  _____ + 0-1e
b. _____  147N + 0-1e
6. Write nuclear reaction for the beta decay of the following isotope: 9038Sr
7. Write the nuclear reaction for each of these word equation:
a. Radon-222 emits an alpha particle to form polonium-218.
The Electron (Ch5)
___ Dalton
___ Bohr
___ Rutherford
___ Thompson
___ Modern Atomic Theory
___ Schrodinger
___ Heisenberg
___ Planck
a. uncertainty principle – can’t know both the location and momentum of an electron
b. figured out the smallness of things and that light is quantized
c. father of the modern atomic theory, everything made of atoms
d. planetary model of the atom, electrons move around the nucleus like planets around sun.
e. plum pudding model of the atom: atom looks like chocolate chip cookie
f. gold foil experiment – atoms have a dense core called nucleus
g. he gave the wave equation – mathematical description of location of electron
h. everything made of atoms, atoms have electrons moving around nucleus like a fan blade,
can only be explained mathematically
1. Find the Battleship Position, the Electron Configuration, and the Orbital Filling Diagram for these atomic numbers:
a. Atomic number 20
b. Atomic number 56
2. What is the frequency of radiation with a wavelength of 5.0 x 10 -8 m?
3. What is the energy of a photon whose frequency is 3.0 x 10 12 Hz?
Periodicity (Ch6)
1. Arrange these elements in order of decreasing atomic size: sulfur, chlorine, aluminum and sodium.
Does your arrangement demonstrate a periodic or group trend?
2. Distinguish between the first and second ionization energies of an atom.
3. Indicate which element in each of the following pairs has the greatest first ionization energy.
a. lithium, boron
b. magnesium, strontium
4. Chlorine, selenium, and bromine are located near each other on the period table. Which of these elements is
a. the smallest atom?
b. the atom with the highest ionization energy?
5. Which particle has the largest radius in each atom /ion pair?
a. Na, Na+
b. S, S-2
6. Why don’t the noble gases appear in an eletronegativity table?
Naming (Ch9)
1. Identify the following elements as metals, metalloids, or nonmetals.
a. gold
b. silicon
2. The melting point of a compound is 1240’C, and ice melts at 0’C. Is this compound an ionic or molecular compound?
3. Write the formulas for these compounds.
a. barium fluoride
b. calcium carbonate
c. lithium hypochlorite
d. tin(II) hydroxide
e. tetraiodine nonoxide
4. Write names for these compounds.
a. Al(OH)3
b. NaI
c. Sn3(PO4)2
d. CS2
e. Cl2O7
f. N2O5