Grade 9 Science
Communication
Students and parents may reach me by email or by phone:
ismith@pembinatrails.ca school – 452 3040 ext. 5434 home – 783 4621
Chemistry Unit Test
The unit test will be on Friday March 23rd for all grade 9 classes.
Students should be prepared to answer the following questions:
S1-2-01 Describe how historical ideas and models furthered our understanding of the nature of matter.
Include: Greek ideas, alchemy, Lavoisier
Use the Word Bank below to identify the following:
Lavoisier Aristotle Empedocles Bacon
Democritus Alchemists Dalton Boyle
1.) He was the first person to introduce the idea of a Scientific method.
______________________
2.) In 450 BCE, he proposed that matter was composed of four elements: Earth, Water, Air, Fire.
______________________
3.) He was a very influential philosopher who rejected the “atomos” model and adopted the “four element model”.
______________________
4.) French Chemist who discovered Oxygen and its properties.
______________________
5.) They were the first people to perform hands on experimentation. They were part philosopher, mystic, magician, and chemist.
______________________
/5
S1-2-03 Define element and identify symbols of some common elements. Include: the first 18 elements, K, Ca, Fe, Cu, Zn, I, Ag, Sn, Au, W, Hg, Pb,
Symbol Name Name Symbol
1.) Zn 6.) Silver
2.) He 7.) Neon
3.) Hg 8.) Iron
4.) Au 9.) Aluminum
5.) N 10.) Potassium
Symbol Name Name Symbol
11.) Cl 16.) Tin
12.) I 17.) Fluorine
13.) Pb 18.) Nickel
14.) B 19.) Magnesium
15.) C 20.) Calcium
Name Symbol Symbol Name
21.) Lithium 26.) H
22.) Beryllium 27.) O
23.) Sodium 28.) P
24.) Sulphur 29.) Ar
25.) Silicon 30.) W
/30 /30
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S1-2-04
Explain the atomic structure of an atom in terms of the number of protons, electrons, and neutrons, and explain how those numbers define atomic number and atomic mass.
31 __________________ In the space shown, label what the
P numbers (31 and 15) represent.
15 _________________
How many protons, neutrons and electrons does the Atom shown above have?
Protons _____________ Neutrons ____________ Electrons ________
What type of charge does each particle carry?
Protons _____________ Neutrons ____________ Electrons ________
/8
S1-2-05 Assemble or draw Bohr atomic models for the first 18 elements and group them according to the number of outer shell electrons.
Draw Bohr model diagrams for the following elements:
11 40
B Ar
5 18
Protons = Protons =
Neutrons= Neutrons=
Electrons = Electrons =
/3 /3
|
Element Name: _________________/1
Nucleus /2
No. of shells /2
Placement of electrons /2
|
Element Name: _________________/1
Nucleus /2
No. of shells /2
Placement of electrons /2
|
/20
S1-2-08
Relate the reactivity and stability of different families of elements to their atomic structure.
Include: alkali metals, alkaline earths, chalcogens, halogens, noble gases
Using good scientific language, state which of the elements in the previous question is more chemically stable and explain why.
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________/3
S1-2-06
Investigate the development of the periodic table as a method of organizing elements.
Include: periods, families (groups)
Using the periodic table on page 3, locate the following elements and match them with the Group/Family to which they belong (draw a line to connect the correct answer):
Group/Family Element
Lithium Chalcogens
Oxygen Halogens
Argon Noble Gases
Fluorine Alkali Metals
Magnesium Alkaline Earth Metals /5
S1-2-07
Investigate the characteristic properties of metals, non-metals, and metalloids and classify elements according to these properties.
Examples: ductility, conductivity of heat and electricity, lustre, reactivity
True or False
1. Non-metals are good conductors of heat and
electricity. ________
2. All metals are solid at room temperature. ________
3. Metalloids are semiconductors. ________
4. The elements that make up the noble gas family
are unreactive. ________
5. About 75% of the known elements are metals. ________
6. Malleable elements can be stretched into thin wires ________
7. Non-metals are found on the left hand side of the periodic table _______
8. Transition metals react violently when placed in water _______
/8
S1-2-08
Relate the reactivity and stability of different families of elements to their atomic structure.
Include: alkali metals, alkaline earths, chalcogens, halogens, noble gases
True or False
1. The alkali metals have one valence electron and
are very reactive. ________
2. All of the elements in period 3 have 3 energy shells. ________
3. The Halogens only need to add one electron in ________
order to stabilize their outer shell
4. Alkaline Earth metals have 2 electrons in their outer shell ________
(2 valence electrons).
/4
S1-2-09
Compare elements to compounds.
Include: atoms, molecules
Element Molecule Compound
Use words from the wordbank above to best describe:
Fe2O3 ___________________________
O2 ___________________________
He ___________________________
/3
Multiple Choice
1. If salt and sugar are stirred together in a beaker, the resulting substance is best described as a(n):
a) element b) compound c) mixture d) molecule
2. Metals:
a) are all solid at room temperature.
b) make up about 15% of all the elements.
c) conduct electricity.
d) are brittle at room temperature.
3. The alkali metals :
a) are very reactive. b) have two valence electrons.
c) are found in group IIA on the periodic table. d) all of the above.
4. If a compound contains; 8 atoms of aluminum, 12 atoms of carbon, and 36 atoms
of oxygen, its chemical formula could be:
a) Al2(CO3) b) 4 Al2(CO3)3 c) Ca2Al8O6 d) 14 Al2O36
/4
S1-2-10
Interpret chemical formulas of elements and compounds in terms of the number of atoms of each element.
Examples: He, H2, O2, H2O, CO2, NH3
Write down the Type and # of atoms in the following formulae
13.) CuSO4
Element Subscript Brackets Coefficient # of Atoms
/4
14.) 3 NH4NO3
Element Subscript Brackets Coefficient # of Atoms
/8
15.) 2 Pb(NO3)2
Element Subscript Brackets Coefficient # of Atoms
/14
S1-2-12
Differentiate between physical and chemical changes.
Indicate whether the following changes are chemical or physical by circling your answer. (1pt)
Give two reasons why to back up your answer. (2pts)
Answer in complete sentences.
Hint: what are the clues that indicate a chemical change?
1. Boiling water to change it from water to steam Chemical or Physical?
2. Burning a piece of paper Chemical or Physical?
3. Making compost with grass clippings from the garden. Chemical or Physical?
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