Year 9 Homework
Chemical Technology
Term 2 Week 1
Due: …… /…… / 20……
Chemical Stories
This sheet is to be placed in your homework folder and handed in for marking on the due date.
Keep all completed homework sheets in your homework folder as they will make an excellent
study resource. Credit will be given for completed homework sheets. Some research may be
necessary to answer all questions. “It wasn’t in my book” will not be accepted as a satisfactory
excuse. See me if you need help.
1. Dalton proposed an atomic theory that contained four postulates i.e.
* all matter consisted of tiny particles called atoms T F
* atoms were indivisible T F
* atoms of the same element were identical to one another T F
* atoms combine in sample whole number ratios T F
2. Match the scientist on the left with the theory on the right.
J. J. Thomson
nuclear model
Ernest Rutherford
discovery of the neutron
Niels Bohr
plum pudding model
James Chadwick
electrons orbit the nucleus in shells
3. Draw diagrams which represent the difference in atomic models
proposed by
a. Rutherford
b. J.J Thompson
c. Niels Bohr
Parent’s signature …………………………… Date: …… / …… / 20 ……
Teacher’s signature …………………………… Date: …… / …… / 20 ……
Term 2 Week 2
1. For the purpose of this topic we assume that there are three sub-atomic
particles in existence.
(a) Define the phrase “subatomic”……………………………………………………………………………………………
…………………………………………………………………………………………………….
(b) Name the sub-atomic particle that has the opposite charge to an
Electron……………………………………………………………………………………………
……………………………………………………………………………………………………..
(c) Name the sub-atomic particle that has no charge and is found in the
nucleus of the atom……………………………………………………………………………..
(d) Name the least massive of the three sub-atomic particle.
………………………………………………………………………………………………………
(e) All atoms are neutral. Outline the reason for this.
….………………………………………………………………………..
…………………………………………………………………………...
2. . Complete each statement by placing numbers in the spaces.
Hydrogen atoms contain …… proton(s) and …… electron(s).
Oxygen atoms contain …… proton(s) and …… electron(s).
Copper atoms contain …… proton(s) and …… electron(s).
3. The periodic table of the elements has horizontal rows called
……………………… and vertical columns called …………………
4. What are noble gases? What’s another name for noble gases?
………………………………………………………………………………………………………
……………………………………………………………………………………………………
5. What are halogens? Give three examples.
………………………………………………………………………………………………………
………………………………………………………………………………………………………
6. What feature of atoms indicates atoms of different elements?
………………………………………………………………………………………………………
………………………………………………………………………………………………………
Parent’s signature …………………………… Date: …… / …… / 20 ……
Teacher’s signature …………………………… Date: …… / …… / 20 ……
Term 2 Week 3
1. Using the Web site www.chemicool.com, identify the elements that make up
the groups of Periodic Table which are coloured; Sky blue, Blue/Purple,
Yellow and Dark green. Write the name of the group and 3 examples of
elements belonging to the group.
Groups
Sky Blue
Blue/Purple
yellow
Dark green
Examples
2.
2.
2.
2.
1.
1.
1.
1.
3.
3.
3.
3.
2. Complete the table below, showing the number of protons, electrons, and
neutrons for the following elements.
Elements
Number of
Protons
Number of
electrons
Number of
neutrons
Sodium
Tin
Aluminium
Nitrogen
Calcium
3. List two chemical and two physical properties of metals and non-metals.
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………
…………………………………………………………………………………………………..
4. Complete each statement by placing numbers in the spaces.
Hydrogen atoms contain …… proton(s) and …… electron(s).
Oxygen atoms contain …… proton(s) and …… electron(s).
Copper atoms contain …… proton(s) and …… electron(s).
Parent’s signature …………………………………… Date: …… / …… / 20 ……
Teacher’s signature …………………………………… Date: …… / …… / 20 ……
Term 2 Week 4
z
1. Identify the symbols A, E and Z as used in this way: E
A
A represents the ….………………………………………………………
………………………………………………………………………………
E represents the ….………………………………………………………
………………………………………………………………………………
Z represents the ….………………………………………………………
………………………………………………………………………………
2. For each of the compounds below, list the number of each atom of elements
which have combined to form them.
(a) BaSO4…………………………………………………………………
……………………………………………………………………………………………
(b) SnCl4 …………………………………………………………………
……………………………………………………………………………………………
(c) AgNO3………………………………………………………………………………..
……………………………………………………………………………………………
(d) H₂SO4 ………………………………………………………………………………...
……………………………………………………………………………………………
3. Many compounds form when elements join together. Identify the elements which
make up each of the following compounds, and how many atoms of each are
needed.
(a) MgCl2 ………………………………………………………………
(b) HCl…………………………………………………………………
(c) Na2( CO)3……………………………………………………………………………..
4. When compounds form, the molecules they make reflect the atoms they contain.
Use the key symbols below to represent some molecules of compounds in diagram
form
Oxygen
Carbon
Magnesium
Hydrogen
(a) H2O
( c) Na2O
Chlorine
Sodium
(b) MgO
(c) CO 2
Parent’s signature ………………………………. Date: …… / …… / 20 ……
Teacher’s signature …………………………… Date: …… / …… / 20 ……
Term 2 Week 5
When naming simple compounds between metals and non metals, the metal is
named first and non- metal name is changed to end in – ide. Use this rule to name
compounds formed between the following elements and suggest their formulas. Use
this rule to name the following compounds.
(a) sodium and oxygen
name of compound…………………………………..
formula …………..
(b) potassium and nitrogen
name of compound………………………………..
formula …………..
(c) aluminium and sulfur
name of compound………………………………
formula …………..
(d) calcium and bromine
name of compound………………………………
formula …………..
(e) silicon and chlorine
name of compound………………………………
formula …………..
(f) hydrogen and oxygen
name of compound………………………………
formula …………..
(g) zinc and phosphorus
name of compound………………………………
formula …………
2.Give two properties of acids and two properties of bases.
…………………………………………………………………………………………………
…………………………………………………………………………………………………
………………………………………………………………………………………………….
Parent’s signature …………………………… Date: …… / …… / 20 ……
Teacher’s signature …………………………… Date: …… / …… / 20 ……
Term 2 Week 6
1. Use the word bank to identify the following reactions
Decomposition
Burning
Precipitation
Corrosion
a. Hydrochloric acid + sodium chloride
b. Magnesium + oxygen
Neutralisation
salt + water
metal oxide
c. carbon + oxygen
heat
d. Calcium carbonate
e. Copper sulphate + barium nitrate solution
insoluble substance +
Soluble solution
2. Some hydrochloric acid was added to two different chemical compounds in
different test- tubes. The volume of gas given off was measured in mL’s
Time (mins)
1
2
3
4
Volume of gas given off by
Calcium carbonate
Copper carbonate
1
2
3
5
7
9
11
16
Draw a line graphs on the same axis to show the relationship between time and
amount of gas given off by each compound.
Volume of gas
given off mL
Time in mins
Parent’s signature …………………………… Date: …… / …… / 20 ……
Teacher’s signature …………………………… Date: …… / …… / 20 ……
Term 2 Week 7
1. What are indicators? Give two examples of indicators .
2. What would be the pH of the following substances
a.
b.
c.
d.
Concentrated acid
Weak acid
Concentrated base
Water
3. What gas is given off when metals react with acids? How can you test this
gas?
4. Dictionary exercise ( Find the meanings of the following words)
a.
b.
c.
d.
e.
f.
g.
h.
Atom
Element
Compound
Molecule
Reactions
Law of conservation mass
Precipitate
Alkali
5. Write a word to match the following statements
Another word for burning! ………………………………………………….
This is always formed when substances react…………………………………..
General name for chemicals you start with…………………………………….
Well known acid in a laboratory…………………………………………………….
Gives a squeaky pop test…………………………………………………………………
Formula for water……………………………………………………………………
Is a green house gas…………………………………………………………………
Element found in most fuels……………………………………………………………
Parent’s signature …………………………… Date: …… / …… / 20 ……
Teacher’s signature …………………………… Date: …… / …… / 20 ……
10.2 Chemistry
Vocabulary
Define the following terms.
Atoms
……………………………………………………………………………………
Elements …………………………………………………………………………………...
Compounds ………………………………………………………………………………
Molecules …………………………………………………………………………………
Reaction…………………………………………………………………………………….
Product…………………………………………………………………………………….
Decomposition……………………………………………………………………………
Indicator …………………………………………………………………………………..
Corrosion………………………………………………………………………………….
Combustion………………………………………………………………………………
Term 2 Week8
1. What is the difference between an element and a compound?
Support your answer with examples.
…………………………………………………………………………………………
…………………………………………………………………………………………
…………………………………………………………………………………………
2. Elements are represented using Sy………..ls.
3. Compounds are represented by for…………….s.
4. Unscramble these elements.
a.
b.
c.
d.
e.
f.
g.
Getrnion
Ygnoxe
Lmiaumniu
tasimspou
cuimalc
gmgneiumm
inerfluo
5. Complete the table below.
Element name
Iron
Symbol
Metal or non-metal
S
Iodine
Cu
Magnesium
6. A chemical reaction may be represented by an equation. It shows the
raw materials ( the reactants) and what is formed (the products).
Magnesium + oxygen
magnesium oxide
a. Name the reactants in the above reaction. ………………..............................
b. Name any products. ………………………………………………
c. What type of reaction this?
d. What product would be formed if Iron is used instead of magnesium?
Parent’s signature …………………………… Date: …… / …… / 20 ……
Teacher’s signature …………………………… Date: …… / …… / 20 ……
Term 2 Week 9
Adopt-An-Element
Requirements:
1) Complete an Adopt An Element information sheet. (60% of grade)
You may use a variety of reference sources. Possible ideas are encyclopaedia’s (book
or CD Rom), science encyclopaedia’s, science catalogues, magazines, and/or Internet sites*.
Information sheets must be neat, written in black ink, and contain all the information
requested. You also need to provide a list of your sources on the back of your
information sheet. A minimum of three sources are required.
2) Create an advertisement for your element. (40% of grade)
The advertisement must include the element’s name, symbol, atomic number,
atomic mass, cost, and an advertising slogan that describes one or more of its important
uses. Advertisements must be neat, colorful, and contain all the information listed
above. You may add pictures that relate to your advertisement theme.
Example:
A list of periodic table sites is available on
The Science Spot
http://sciencespot.net/
Go to Kid Zone, then choose Chemistry Links
Be sure to include:
Element’s symbol
Element’s name
Atomic number
Atomic mass
Ad slogan
Cost
Your name
You may add pictures or drawings that illustrate the various uses for your element.