Mr_Abdulrahman
Posts : 42
Join date : 2010-01-28
 |  Subject: CHEMISTRY-ANIMALS MODEL EXAM 6 ANSWERS G 7  Sat Feb 13, 2010 8:46 am | |
| 1st : Life Science1. 1- STATE IF THE FOLLOWING SENTENCES ARE TRUE OR FALSE , THEN CORRECT THE WRONG SENTENCES 1 marks1. 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 marks1. The front limbs and flippers in seals are adapted for movement.2. whales and silver fish are two examples of mammals3-GIVE THE SCIENTIFIC REASONS FOR THE FOLLOWING1 marksGastropods leave a slippery carpet under it.To facilitate its movement4-WHAT WOULD HAPPEN IF1 marksA mollusk has no gillsThe 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 marksBivalves
| Gastropods
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- Mollusks have one or no shells at all
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7- ANSWER THE FOLLOWING QUESTIONS1 marks1. Which structure enables the seastar to move? The tube feet 2. What does the foot of a cephalopod look like?Tentacles around its mouth9- CHOOSE THE CORRECT ANSWER 1 marks1. A …………….feed on dead organisms.a)Host b) free-living organism c)scavenger d)parasite 2. …………………have hair or fura)mammals b) amphibians. c)reptiles. d) birds2nd : Chemistry 1. STATE IF THE FOLLOWING SENTENCES ARE TRUE OR FALSE , THEN CORRECT THE WRONG SENTENCES1 marks1. Nitrogen gas is a diatomic molecule in nature.( T )………………………………………………………………….………………………………..…… 2. Liquids with high viscosities flow fast. ( F )………………………………………………………….slow…………………………..……………… 2. COMPLETE THE FOLLOWING SENTENCES 2 marks1. Mixtures are two types heterogeneous and homogenous2. You are familiar with some molecules such as water and oxygen3. GIVE THE SCIENTIFIC REASONS FOR THE FOLLOWING1 marksThe 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 timeA layer of rust will form on iron because of the chemical change of iron into iron oxide when combine with oxygen in the air5- LABEL THE FOLLOWING DRAWINGS 1 marksa) Label 1, 2 and 3 on the diagram 1. electron 2. electron cloud3. nucleus(protons and neutrons) b) What is the mass and atomic numbers ofthis atom? Atomic mass = 6 Mass number = 12c) What is the name and symbol of thisatom? Carbon atom "C" 6- GIVE THE SCIENTIFIC TERM1 marks1. 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 marksElectrons
| Protons
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1. Are negatively charged particles
2. Orbiting around the nucleus |
1. Are positively charged particles
2. forming the nucleus
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8- ANSWER THE FOLLOWING QUESTIONS: 2 marks1. How can you tell one element from another?Physical and chemical properties are used for identifying different elements2. 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 marks1. Which one of the following is not a chemical property of a substance?a)state b)shape c) melting point d) burning in air2. 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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