Grade 9 Science Final Practice Exam Answer Key, Study notes of Arabic

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G r a d e 9 S c i e n c e

Final Practice exam answer Key

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3. Which of the following elements has a total of six electrons in its valence shell?

a. nickel b. chromium c. sulphur d. bromine

4. Jupiter, Saturn, Neptune, and Uranus are considered a family known as

a. the galactic planets b. gas giant planets c. terrestrial planets d. solar planets

5. What is the azimuth of Polaris when observed from Winnipeg, Manitoba?

a. 0° b. 15° c. 35° d. 50°

6. An example of a naturally occurring diatomic molecule is

a. gold b. copernicium c. carbon dioxide d. hydrogen gas

7. Twelve coulombs of electric charge travels through a resistor which uses 24 joules of energy. What is the potential difference across the resistor? a. 2 J/C b. 12 J/C c. 36 J/C d. 288 J/C
8. Ernest Rutherford is credited for the discovery of

a. the moons of Jupiter b. the nucleus of the atom c. deoxyribonucleic acid (DNA) d. the piezoelectric effect

G r a d e 9 S c i e n c e : F i n a l P r a c t i c e e x a m a n s w e r K e y (^) 5

name: ______________________________________________

9. Human egg cells are produced in the a. ovaries b. vagina c. cervix d. uterus
10. The unit for measuring electric current is the

a. joule b. ohm c. ampere d. tesla

11. The diagram below represents

a. an atom of magnesium b. a molecule of sodium c. an alkali metal d. a chalcogen

12. How long does it take the Moon to revolve around Earth?

a. 24 hours b. 27 days c. 12 days d. 1 week

13. A mother is homozygous recessive for a sex-linked trait. Which statement is true?

a. Half of her daughters will display the dominant phenotype. b. All of her daughters will display the recessive phenotype. c. All of her sons will display the dominant phenotype. d. All of her sons will display the recessive phenotype.

G r a d e 9 S c i e n c e : F i n a l P r a c t i c e e x a m a n s w e r K e y (^) 7

name: ______________________________________________

Matching

Place a letter in the pace provided that gives the best match. ( 18 x 0.5 marks each = 9 marks )

_ f _ insulator

_ q _ astrolabe

_ c _ Bohr

_ b _ chromosome

_ e _ halogen

_ a _ Galileo

_ k _ Punnett square

_ i _ light year

_ g _ series circuit

_ d _ atomic number

_ j _ current

m neutron

r joule

_ n _ potassium

_ o _ electroscope

_ h _ altitude

l ovaries

_ p _ Copernicus

a. discovered the moons of Jupiter

b. contain genes

c. developed a model of electron orbitals

d. the protons in a nucleus

e. chlorine

f. does not conduct electricity

g. provides only one path for electrical current

h. a vertical coordinate

i. the distance that light travels in 365 Earth days

j. the movement of electrons through a conductor

k. a model for predicting genotypes

l. female gonad

m. found in the nucleus of an atom

n. an alkali metal

o. detects electric charge

p. claimed that Earth orbited the Sun

q. Arabic instrument for observing stars

r. unit of energy

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Short answer (29 marks)

1. There are two hydro meter readings shown below. One meter reading is for July and the other is for August. ( 4 marks )

a. What is the energy reading for July and August? Show the units. ( 2 marks ) July = 37,531 kWh August = 41,265 kWh

b. What is the energy consumption between July and August in this example? ( 1 mark ) 3,734 kWh

c. If the cost for energy were $0.24 per kilowatt hour, what will this household pay for energy? ( 1 mark ) The household would pay $896.16 for the energy.

2. Name two types of asexual reproduction. For each type, name one species that uses the method. ( 4 marks ) Vegetative propagation → apple tree Binary fission → bacteria Regeneration → starfish, grass Sporulation → fungus, mushrooms, mold Budding → yeast
3. Identify the following elements by name and symbol. ( 5 marks ) a. This element is the lightest in existence. Hydrogen (H) b. This element is the most reactive non-metal. Fluorine (F) c. The atomic mass of this element is approximately 32. Sulphur (S) d. This element contains two more protons than nickel. Zinc (Zn) e. On the periodic table, this element is located on the fourth period and the second family. Calcium (Ca)

July:

August:

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b. If you were paying 7.5 cents per kWh for electrical energy in your area, what would it cost to use this appliance for three months? Cost/month = kWh x (cost per kWh) Cost/month = 123 kWh x $0. Cost/month = $9.225 → $9. Cost/month x 3 months = $9.23 x 3 = $27. It would cost $27.69 to use the appliance for three months.

diagrams and Long answers (44 marks)

1. In a species of dog, the gene for long hair (H) is dominant over the gene for short hair (h). A licensed breeder mates a long-haired male (Hh) with a long-haired female (Hh). ( 7 marks ) a. Draw a Punnett square showing the potential genotypes of this pairing’s offspring. ( 1 mark )

b. What are the possible genotypes of the offspring? In what percentages are they predicted to appear? ( 3 marks ) Twenty-five percent of the puppies will be homozygous dominant (HH). Fifty percent of the puppies will be heterozygous (Hh). Twenty-five percent of the puppies will be homozygous recessive (hh).

c. What phenotypes will the puppies display, and in what percentage? ( 2 marks ) Seventy-five percent of the puppies are expected to show the long hair phenotype and 25 percent are expected to show the short hair phenotype.

d. How can the breeder alter the pairing to ensure that only long-haired puppies are born? ( 1 mark ) The breeder must ensure that at least one of the parents is homozygous dominant (HH) for the hair gene.

Father

Mother

H h

H HH Hh

h Hh hh

G r a d e 9 S c i e n c e : F i n a l P r a c t i c e e x a m a n s w e r K e y (^) 11

name: ______________________________________________

2. Draw a Bohr atom of fluorine. ( 6 marks ) a. Draw the atom, labelling the nucleus and one of the electrons. ( 2 marks )

b. How many neutrons are there in fluorine? ( 1 mark ) 10 neutrons c. What is the mass number for fluorine? ( 1 mark ) 19 amu d. To what family does fluorine belong? ( 1 mark ) halogen family e. What is one trait shared by this family? ( 1 mark ) Any one of the following: n (^) extremely reactive n (^) always one electron short of a complete valence shell n (^) all non-metals

3. Use the diagram below to answer the following questions. ( 5 marks )

a. Are the three bulbs connected in series or parallel? Series b. What is the reading in A2? 2 A c. What is the total current in the circuit? 2A d. The three light bulbs all have the same resistance. What is the voltage across each of the light bulbs? 4 volts

a 1 2 a^ 12 Volts

a 2

nucleus

electron

G r a d e 9 S c i e n c e : F i n a l P r a c t i c e e x a m a n s w e r K e y (^) 13

name: ______________________________________________

6. Why are you unlikely to find snow in countries along the equator? ( 2 marks ) The equator runs along the centre of Earth and is always angled towards the Sun. This region of Earth experiences roughly the same number of daylight hours throughout the year, so the temperature never drops low enough to freeze water.
7. What is the purpose of mitosis and meiosis within the human body? ( 2 marks ) Humans use mitosis in order to create identical copies of cells for the purposes of growth and repair. Humans use meiosis to produce gametes specifically for reproduction.
8. Darren has been observing a newly discovered comet through his telescope. ( 8 marks ) a. Using the data provided in the table below, plot a graph showing the position of this new comet over the months of April to October. ( 5 marks—1 mark for title, 4 marks for graph )

Observation date comet azimuth day within Study

april 1 102.0 0

april 15 95.0 15

May 1 88.0 30

May 15 84.0 45

May 30 83.0 60

June 14 84.0 75

June 29 87.0 90

July 14 92.0 105

July 29 98.0 120

august 13 99.0 135

august 28 91.0 150

September 12 85.0 165

September 27 80.0 180

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b. When Darren shows his data table to Karen, she exclaims that he must have made an error, because the comet is clearly changing the direction of its revolution around the Sun. How might Darren defend his observations? ( 3 marks ) What Darren observed was the phenomenon of retrograde motion. Comets further from the Sun move more slowly in their orbits compared with Earth. This allows Earth to complete a revolution around the Sun before the new comet. From the perspective of someone on Earth, this act of “lapping” the new comet will cause it to appear as though it is zig-zagging east and west through the night sky.

9. What are five indicators of a chemical change? ( 5 marks ) When a chemical change occurs, you can expect to note n (^) a change in colour n (^) heat or light being given off n (^) the formation of bubbles (from escaping gas) n (^) the appearance of a solid (precipitate) in a liquid n (^) that the changes are irreversible

day of Observation

Title: ___________________________________________________

80 90 100 110 120 azimuth of comet (90 degrees = east)