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HERZLIA MIDDLE SCHOOL

GRADE 8

NATURAL SCIENCE MID-YEAR EXAMINATION

1 JUNE 2016

TOTAL: 170

TIME: 90 MINUTES

NAME:

TEACHER'S COMMENT

TEACHER:

CLASS:

MARK: /170 PARENT’S COMMENT

PERCENTAGE

PARENT’S SIGNATURE

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INSTRUCTIONS

1. There are 25 pages including a cover page, an answer sheet and a Periodic Table. Make sure you have all of them.

2. Answer all questions on the paper in blue or black ink.

3. Read each question carefully before answering it.

4. Pay attention to the mark allocation.

5. Plan your time carefully.

6. All the diagrams should be done in pencil and labelled in blue or black ink.

7. Write neatly and legibly.

8. Use the Multiple Choice answer sheets for question 1.

9. Write in full sentences. No one word answer will be accepted.

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BIOLOGY ANSWER SHEET

NAME: ___________________________________ CLASS: _______

Multiple Choice (use pencil only)

Choose the answer, which you consider most appropriate and cross the corresponding letter on this Answer Sheet.

E.g. If your answer to 1.3 is D, indicate your choice like this:

1.3 A B C D

If more than one cross appears in any line, the answer will be marked wrong.

1.1 A B C D

1.2 A B C D

1.3 A B C D

1.4 A B C D

1.5 A B C D

1.6 A B C D

1.7 A B C D

1.8 A B C D

1.9 A B C D

1.10 A B C D

1.11 A B C D

1.12 A B C D

1.13 A B C D

1.14 A B C D

1.15 A B C D

1.16 A B C D

1.17 A B C D

1.18 A B C D

1.19 A B C D

1.20 A B C D

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SECTION A: SHORT QUESTIONS 58

QUESTION 1: Multiple Choice. Choose the correct answer for the following questions.

40 (20X2)

1.1

Figure 1: Fynbos………………

The organisms shown above are all examples of:

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A. geophytes

B. proteas

C. daisies

D. restios (cape reeds)

1.2 The dependent variable of the fishing activity at Breede River was the:

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A. number of fish that were caught

B. fishing locality

C. time of the day

D. type of bait used

1.3 The gas given off during photosynthesis is:

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A. Carbon dioxide

B. Oxygen

C. Hydrogen

D. Water vapor

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1.4 Fynbos is mainly found in the: 2

A. Eastern Cape

B. Gauteng

C. Western Cape

D. Northern Cape

1.5 The Bundi Campsite is situated in the:

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A. Cedarberg

B. Berg River valley

C. Breede River valley

D. Olifants River valley

1.6 Which of the following is not strictly classified as a microorganism? 2

A. Tuberculosis bacteria

B. The malaria parasite (Plasmodium vivax) - Kingdom Protista

C. hair lice

D. yeast

1.7 Most bacteria are measured in: 2

A. micrometers

B. millimetres

C. centimetres

D. nanometres

1.8 The acronym AIDS stands for: 2

A. Acquired Immune deficiency Vector

B. Acquired Immune deficiency Virus

C. Ape Induced Disease System

D. An Incredibly Dire Situation

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1.9 Mountain Fynbos river have brownish stained water mainly due to: 2

A. The high number of people that urinate into the water

B. The high level of copper in the water

C. Fish and frog urine

D. Tannins from the decomposed surrounding vegetation

1.10 The microorganism used in the making of cheese and beer belongs to the Kingdom/group:

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A. Animalia

B. viruses

C. bacteria

D. plants

1.11 Smallest substances (that can exist on their own) that make up matter are known as:

A. molecules

B. compounds

C. gases

D. atoms

1.12 The substance that is dissolved in water is called the:

A. solute

B. solvent

C. solid

D. solution

1.13 Choose the correct statement about comparing gases and liquids

A. Diffusion in gases occurs slower than in liquids

B. Gases cannot easily be compressed compared to liquids

C. Forces of attraction between gas molecules are weaker than in liquids

D. Gas molecules possess less kinetic energy than in liquids

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1.14 How many molecules of potassium permanganate are there in: 5KMnO4?

A. 4

B. 1

C. 5

D. 20

1.15 What do we call the fourth state of matter?

A. LED

B. Smart gas

C. LCD

D. plasma

1.16 Which model would, most likely, show 1 molecule of water (H2O)?

A.

B.

C.

D.

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1.17 What do the letters He represent on the periodic table?

A. Hectic elements

B. Helium

C. Hydrogen

D. Male

1.18 When a stainless steel teaspoon is dipped into hot water it:

A. becomes smaller

B. becomes bigger

C. stays the same

D. melts

1.19 Which of the substances below is a molecule of a compound?

A. CaCO3

B. H2

C. O2

D. Ag

1.20 When carbon dioxide mixes with water it produces:

A. Sulphurous acid

B. Carbon hydride

C. Carbonic dioxide

D. Carbonic acid

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QUESTION 2: SCIENTIFIC TERMINOLOGY 8

Give correct term for the following definitions. Do not give examples.

2.1 The Kingdom that mushrooms are classified under. 1

2.2 The Kingdom of microorganisms that resemble either plant or animal cells. 1

2.3 An organism that does not occur naturally in a country. 1

2.4 The breaking up of a solid substance into particles that spread throughout the

solvent in a solution.

1

2.5 The movement of particles from an area of high concentration to an area of low concentration until an equilibrium is reached. 1

2.6 The change in phase from a liquid state to a solid state. 1

2.7 The fixed, uniform arrangement of particles in a solid substance.

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2.8 Any two or more atoms chemically bonded together to form a new substance. 1

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QUESTION 3: MATCH THE COLUMNS Choose the word/phrase from COLUMN B which best matches the word/phrase in COLUMN A. Write the letter next to the correct number.

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CORRECT LETTER

COLUMN A COLUMN B

3.1 Brown gas A. protist

3.2 responsible sampling B. ether alcohol and water

3.3 Phase with highest kinetic

energy C. O2

3.4 Large leathery leaves D. mutualistic relationship

3.5 Compound molecule formula E. gas

3.6 Plant with an underground bulb F. Protea

3.7 Diatomic molecule G. geophyte

3.8 amoeba H. nitrogen dioxide

3.9 dilute I. Taking small bits of plants for

identification

3.10 lichen J. CO

K. Co

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SECTION B: LONG QUESTIONS 112

QUESTION 1: Fynbos 4

1.1 Give TWO possible advantages (to people) of the Fynbos patch at the Bundi Camp site.

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1.2 Give any two possible disadvantages of the alien trees at the Bundi Campsite. 2

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QUESTION 2: PARTICLE MODEL OF MATTER 28

2.1 You made blue crystals in the laboratory.

2.1.1 Provide labels 1 -7 on the diagram 7

1……………………………….….

7……………………………….….

6……………………………….….

5…………….…………..(container)

4……………………….…………

2……………………………….….

3……………………………….….

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2.1.2 Explain the method of making these blue crystals (ensure that you mention the following in your explanation: solute, solvent, solution).

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2.1.3 Circle the diagram below which would most closely show the arrangement of the crystal particles.

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2.1.4 Circle the diagram below that would most likely show the arrangement of the solution particles.

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2.2 Give one possible reason as to why some pupil’s sugar crystals did not grow. 2

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2.3 Give the main conclusion for each of the following experiments done in class this term:

2.3.1 Salt water was filtered. It was tasted before and after filtration. 2

2.3.2 A small amount of potassium permanganate was placed in some gelatine.

2

2.3.3 Air and water were drawn into a syringe at separate times. You covered the nozzle and pushed the plunger.

2

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2.4 Noah viewed tiny oil droplets which were dancing on the surface of the water under a microscope. Below is a diagram that showed the path of movement of one of the droplets over a period of 30 seconds.

According to the Particle Model of Matter what is the cause of the movement? 2

2.5 Why is it easier to pump a flat bicycle tire than one which is almost the right pressure?

2

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QUESTION 3: CHEMSTRY (CHEMICAL CHAOS) 40

3.1 Tabulate 4 differences between a compound and a mixture. 4

3.2 Give a definition for a compound molecule.

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3.3 Give the symbols for the following elements: 4

Gold: ______

Silver: ______

Sodium: _____

Calcium: ______

3.4 Give the names for the following elements: 4

H: _______________________________

Cu: ______________________________

He: ______________________________

Fe: ______________________________

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3.5 Provide the requested information for the following chemical formulae: (Circle the correct option for Atom of element, molecule of an element or compound molecule. The rest requires a written answer).

3.5.1 Referring to 2H2O:

a) Circle which one of the following is correct:

Atom of an element molecule of an element compound molecule 1

b) Name of the elements that are present:________________________________________________ 2

c) Number of each of these element:___________________________________________ 2

d) How many molecules in 2H2O:_______________________ 1

3.5.2 Referring to KMNO4:

a) Circle which one of the following is correct:

Atom of an element molecule of an element compound molecule 1

b) Name of the elements that are present:________________________________________________ 3

c) Number of each of these element:___________________________________________ 3

d) How many molecules in KMnO4:_______________________ 1

3.6 Provide the chemical word equation for the reaction that occurs between Zinc and Iodine to produce Zinc iodide 4

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3.7 Explain two things that Mr Joseph demonstrated to show that a new substance, with its own characteristics, was formed from the chemical reaction between iron and sulphur.

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3.8 Name the main gas responsible for both global warming and acid rain. 1

3.9 Give 2 things that you can do to reduce emissions (release) of the gas mentioned in question 3.8.

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QUESTION 4: MICROORGANISMS AND SCIENTIFIC METHOD 30

4.1 Give another scientific name for microorganism. 1

4.2 What do we call organisms that cause disease? 1

4.3 What is the correct name for single-celled? 1

4.4 List 4 conditions that most bacteria need to survive. 4

4.5 Joseph did a Science expo project comparing the comparative rate of growth of cheese mould in processed Gouda cheese versus non-processed Gouda cheese over a period of 6 weeks. He used a grid to measure the area covered by the mould in cm3. This was done at 17:00 every Monday for the 6 weeks. Below are the results of his experiment:

Week Mould cover in processed Gouda cheese (cm3)

Mould cover in non-processed Gouda cheese (cm3)

1 0 0

2 0 0

3 0 1

4 0 2.5

5 0.5 3.2

6 0.5 4.5

4.5.1 Provide an aim for this experiment 1

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Do your double line graph here:

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4.5.2 Give a possible hypothesis for the experiment and back it up with an explanation/reason 3

4.5.3 Give 4 variables that should be controlled in this experiment. 4

4.5.4 State the dependent variable in this investigation. 1

4.5.5 State the independent variable in this investigation. 1

4.5.6 Use the data in the Joseph’s table to draw a double line graph (on the previous page). Hint: use a key to show which line represents the mould growth rate of which cheese. 10

4.5.7 Provide a conclusion for this experiment 2

4.5.8 To which Kingdom does cheese mould belong to? 1

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THIS PAGE IS BLANK

PLEASE TURN OVER TO ANSWER QUESTION 5

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QUESTION 5: ARTICLE (COMPREHENSION)

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Four new elements to be added to periodic table

By Lin Taylor, for CNN

Chemistry textbooks as we know it are officially out of date, as four new elements will soon be added to the periodic table.

Elements 113, 115, 117 and 118 have formally been recognized by the International Union of Pure and Applied Chemistry (IUPAC), the U.S.-based world authority on chemistry. The organisation's announcement on December 30 means the seventh row of the periodic table is finally complete.

It's the first time the table has been updated since 2011, when elements 114 (Flerovium) and 116 (Livermorium) were added. Devised by Russian chemist Dmitri Mendeleev in 1869, the table categorises chemical elements according to their atomic number.

"The chemistry community is eager to see its most cherished table finally being completed down to the seventh row," said Jan Reedijk, president of the Inorganic Chemistry Division of IUPAC, in a statement.

"IUPAC has now initiated the process of formalising names and symbols for these elements temporarily named as ununtrium, (Uut or element 113), ununpentium (Uup, element 115), ununseptium (Uus, element 117), and ununoctium (Uuo, element 118)."

A Russian-American team at the Joint Institute for Nuclear Research in Dubna, Oak Ridge National Laboratory in Tennessee and Lawrence Livermore National Laboratory in California discovered elements 115, 117 and 118, while Japanese researchers were credited for discovering element 113.

All four elements are not found in nature, and were artificially created in laboratories.

2013: Researchers confirm creation of element 01:16

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5.1 Give the names of the four new elements that have been added to the periodic table.

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5.2 Give the number of the row of the periodic table to which the new elements have been added?

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5.3 Name the Russian scientist who devised the periodic table of the elements. 1

5.4 Give the symbol of one other element found in the same row as the four new elements you listed in Question 6.1.

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5.5 Give a definition for the word element. 3

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