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 CHEMISTRY-ANIMALS MODEL EXAM 6 ANSWERS G 7

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Mr_Abdulrahman

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Posts : 42
Join date : 2010-01-28

PostSubject: CHEMISTRY-ANIMALS MODEL EXAM 6 ANSWERS G 7   Sat Feb 13, 2010 8:46 am

1st : Life Science

1. 1- STATE IF THE FOLLOWING SENTENCES ARE TRUE OR FALSE , THEN CORRECT THE WRONG SENTENCES 1 marks



1. Adult frogs have fins to help them swimming. ( F )

……tadpoles……………………………………………………………………………………….

2. The internal system of fluid filled tubes in mollusks is called water vascular system. ( F )

……………………………………………………………… echinoderms ……………………



2-COMPLETE THE FOLLOWING SENTENCES2 marks



1. The front limbs and flippers in seals are adapted for movement.

2. whales and silver fish are two examples of mammals





3-GIVE THE SCIENTIFIC REASONS FOR THE FOLLOWING1 marks

Gastropods leave a slippery carpet under it.

To facilitate its movement







4-WHAT WOULD HAPPEN IF1 marks



A mollusk has no gills

The mollusks that live in water can not get oxygen dissolved water







5- GIVE THE SCIENTIFIC TERM 1 marks





  • An organism that keeps its body temperature stable whether the temperature of the surrounding changes or not . ( endothermic )
  • The process in which an organism is developed from


a single organism. ( asexual reproduction )



6-COMPARE BETWEEN THE FOLLOWING (two items are needed for each): 1 marks


Bivalves
Gastropods


  • Mollusks have two shells




  • They have radulas












  • Mollusks have one or no shells at all




  • They do not have radulas












7- ANSWER THE FOLLOWING QUESTIONS1 marks

1. Which structure enables the seastar to move?

The tube feet



2. What does the foot of a cephalopod look like?

Tentacles around its mouth





9- CHOOSE THE CORRECT ANSWER 1 marks



1. A …………….feed on dead organisms.

a)Host b) free-living organism c)scavenger d)parasite



2. …………………have hair or fur

a)mammals b) amphibians. c)reptiles. d) birds















2nd : Chemistry

1. STATE IF THE FOLLOWING SENTENCES ARE TRUE OR FALSE , THEN CORRECT THE WRONG SENTENCES1 marks



1. Nitrogen gas is a diatomic molecule in nature.( T )

………………………………………………………………….………………………………..……

2. Liquids with high viscosities flow fast. ( F )

………………………………………………………….slow…………………………..………………



2. COMPLETE THE FOLLOWING SENTENCES 2 marks

1. Mixtures are two types heterogeneous and homogenous

2. You are familiar with some molecules such as water and oxygen



3. GIVE THE SCIENTIFIC REASONS FOR THE FOLLOWING

1 marks



The melting of ice is endothermic.

Because in order to melt , it takes energy from the surrounding

4. WHAT WOULD HAPPEN IF 1 marks



1. Iron is left in air for a long time

A layer of rust will form on iron because of the chemical change of iron into iron oxide when combine with oxygen in the air



5- LABEL THE FOLLOWING DRAWINGS 1 marks



a) Label 1, 2 and 3 on the diagram

1. electron

2. electron cloud

3. nucleus(protons and neutrons)

b) What is the mass and atomic numbers ofthis atom?

Atomic mass = 6

Mass number = 12

c) What is the name and symbol of thisatom?

Carbon atom "C"





6- GIVE THE SCIENTIFIC TERM1 marks



1. A chemical force of attraction between atoms. ( chemical bond )

2. The amount of space an object takes up. ( volume )





7- COMPARE BETWEEN THE FOLLOWING (two items are needed for each): 1 marks




Electrons
Protons

1. Are negatively charged particles



2. Orbiting around the nucleus

1. Are positively charged particles



2. forming the nucleus















8- ANSWER THE FOLLOWING QUESTIONS: 2 marks

1. How can you tell one element from another?

Physical and chemical properties are used for identifying different elements



2. What happens to the temperature of a substance when changing from a liquid to a gas?

Increases until it reaches the boiling point, it stops for a while so that all liquid turns into gas .



5- CHOOSE THE CORRECT ANSWER:1 marks



1. Which one of the following is not a chemical property of a substance?

a)state b)shape c) melting point d) burning in air



2. If the total thermal energy of 100 particles of a substance is 1000 j, then its temperature will be…………….

a)1000 c b) 100 c c) 10 c d) 1 c




Best wishes,
And good luck
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