Download Grade 9 Chemistry Unit Test Name: Part A: Multiple Choice (15

Grade 9 Chemistry Unit Test
Name: ____________________
Part A: Multiple Choice (15 points)
_____ 1. Which scientist is responsible for developing the scientific method?
a) Francis Bacon b) Joseph Proust c) The Alchemists
d) Antoine Lavoisier
_____ 2. Which group of “scientists” was very hands-on, but also very secretive?
a) Francis Bacon b) Joseph Proust c) The Alchemists
d) Antoine Lavoisier
_____ 3. Which scientist first defined elements as pure substances and identified 23 new elements?
a) Francis Bacon b) Joseph Proust c) The Alchemists
d) Antoine Lavoisier
_____ 4. Which law states that atoms can not be created or destroyed?
a) Law of Balancing
b) Law of definite proportions
c) Law of Conservation of Mass
_____ 5. Which of the following particles is not found in the nucleus?
a) Protons
b) Electrons
c) Neutrons
_____ 6. Which of the following particles has a neutral charge?
a) Protons
b) Electrons
c) Neutrons
_____ 7. The electrons in the outer most shell of an atom are called:
a) Valence Electons
b) Outer Electons
c) Shell Electrons
_____ 8. Which of the following is not a physical property?
a) Density
b) Rusting
c) Solubility
d) Volume
_____ 9. Which of the following is an example of a noble gas?
a) Argon
b) Chlorine
c) Lithium
d) Hydrogen
_____ 10. Which of the following is an example of a halogen?
a) Argon
b) Chlorine
c) Lithium
d) Hydrogen
_____ 11. A combination of one or more elements is called a:
a) Atom
b) Element
c) Compound
d) Mixture
____ 12. According to the Bohr model of electrons, how many electrons can the first electron shell hold?
a) 8
b) 1
c) 2
d) 4
_____ 13. Which of the following elements is in their proper notation?
a)
b)
c)
d)
______ 14. An anion has a ____________ charge and a cation has a _____________ charge.
a) positive, neutral b) neutral, positive c) negative, positive
d) negative, neutral
______ 15. Which type of ion loses an electron?
a) anions
b) atoms
c) cations
Part B: Fill in the Blanks (20 Points)
1. Examine the compounds below and state how many atoms of each element are in the compounds.
a) NaCl: _____________________________________________________
b) CuSO4: ____________________________________________________
c) Al (LiO2)3: _____________________________________________________
2. Complete the chart with the appropriate period and group number for each element:
Element
Period
Group
Helium
Chlorine
Calcium
3. Complete the chart with the appropriate number of valence electrons and the number of electrons
shells in each element:
Number of Valence Electrons and Shells
Element
Number of Valence Electrons
Number of Electron Shells
Beryllium
Sulfur
Potassium
4. The atomic number tells you the number of ______________________ in an element. It also tells
you the number of _________________ in a neutral atom.
5. To determine the number neutrons in an element, you must find the _____________and subtract the
________________ number.
Part C: Matching (15 points)
Match the definition in column A with a term in column B. Write the letter of the response in the blank
on the left.
Column A
Column B
A) Demetri Mendeleev
_____ Evaporation
B) Atom
_____ The smallest part of an element
C) Qualitative Property
_____ A ratio of mass and volume
D) Chemical Property
_____ Whip cream
E) John Dalton
_____ Designed the first periodic table
F) Density
_____ Frying an egg
G) Molecule
_____ The pH of a substance
H) Physical Property
_____ Salad Dressing (oil and vinegar)
I) Chemical Change
_____ Sulfur has a mass of 26 grams
J) Physical Change
_____The smallest part of a compound
K) Quantitative Property
_____ Salsa
L) Heterogeneous Mixture
_____ Developed the first atomic theory
M) Homogenous Mixture
_____ The volume of a substance
N) Suspension
_____ Milk
O) Colloid
_____ Sulfur is yellow
Part D: Calculations Section
1. Balancing Equations (10 points)
Balance the following equations. You do not have to show your work. Double check your answers!
1. ____Cl2 + ____NaBr  _____NaCl + _____ Br2
2. ____ Al + ____ CuO _____Al2O3 + _____ Cu
3. ____K2O + ____ H2O  _____ KOH
4. ____ C + ______ H2  _____CH4
2. Density Problem: Make sure to show all your work (5 points)
A cup of yellow color metal beads were measured to have a mass of 425 grams. By water
displacement, it was determined the beads have a volume of 48 mL. Given the following densities,
identify the metal. You must show your calculations and indicate the correct metal to receive full points.
a) Gold (19.3 g/mL)
b) Copper (8.85 g/mL)
c) Bronze (9.87 g/mL)
3. Bonding (25 points)
Calculate the following information for each atom or ion (9 points):
Element
Proton Number
Electron Number
Cation/Anion/Atom
Al+3
Se-2
Mg
Calculate the following information for each isotope (6 points):
Element
Proton Number
Neutron Number
8
Mass
Carbon
7
15
21
Calcium
Using either a Bohr diagram or a Lewis Dot Diagram, show an ionic bond occurring between these two
elements (5 points):
a) Magnesium and Oxygen
b) Lithium and Sulfur
Using either a Bohr diagram or a Lewis Dot Diagram, show the covalent bonds occurring in these
compounds (5 points):
a) H2O
b) CH4