3) A reaction where an element substitutes another one.

Transcription

1 Cairo Governorate Nozha Directorate of Education Nozha Language Schools Ismailia Road Branch Department: Science Form : 3 rd Prep. Work Sheet Unit ( 1 ) Lesson ( 1 ) Chemical Reactions * Write the scientific term:- 1) The breaking up of bonds in the molecules of the reactant and the formation of new bonds in the molecules of the new resultants from the reactions. [.. ] 2) The reaction between acid and alkali to form salt and water. 3) A reaction where an element substitutes another one. 1 [.. ] [.. ] 4) A substance which loses an electron or more during a chemical reaction. 5) Chemical reaction in which change happens between the two radicals ( ions ) of the two compounds to form another two compounds. * Complete the following statements:- 1) Thermal decomposition reactions involve the. of the compounds by the effect of. 2) In the following reaction: H 2 + CuO Cu + H 2 O copper oxide undergoes. process, while hydrogen undergoes. process. 3) NaCl. 4) During the formation of sodium chloride molecule from its elements, sodium acts as. agent while chlorine act as. agent.

2 5) Oxidation and reduction are two. processes. 6) Chemical activity series is the arrangement of metals in. order according to the degree of their. 7) From the following reactions, answer the following first: NaCl + AgNo 3 precipitate + + ( B ) second : ( B ) salt + ( D ) a- Write the symbol of ( B ) and ( D ) b- Write chemical formula of the precipitate and the salt. c- Mention the kind of each reaction. * Give reasons for:- 1) The occurrence of effervescence on putting a piece of aluminum in diluted hydrochloric acid. 2) A white precipitate is formed on adding silver nitrate solution to sodium chloride solution. 3) Chemical reactions are very important to us. 4) A yellowish white color is formed on heating white sodium nitrate. 2

3 * What happens when:- 1) Heating a red mercuric oxide. 2) Chlorine atom gains an electron. 3) Adding of dilute HCl to a piece of copper. * Write an equation for each of the three next observations of the following practical experiments:- 3

4 * From the opposite figure, answer the following:- 1. Show by symbolic equations the name of the evolved gas in both tubes ( A ) & ( B ) 2. What is the name of the liquid which is formed in tube ( C )? 4

5 * Write the scientific term:- Unit ( 1 ) Lesson ( 2 ) Speed of chemical Reaction 1) A substance which increases the speed of the chemical reaction without interfering in it or being consumed. 2) The change in the concentration of the reactants and resultants at a unit time. 3) A catalyst which is used to increase the rate of breaking up of hydrogen peroxide. 4) Slow reacting compounds. 5) The enzyme which is founds in sweet potato and accelerates the decomposition rate of hydrogen peroxide. * Give reasons for:- 1) Aluminum wire burns inside a jar filled with oxygen faster than the burning in atmospheric air. 2) Food must be heated during its preparation. 3) A certain mass of iron filing reacts with acids faster than the reaction of a block of iron have the same mass with acids. 4) Magnesium reacts with concentrated hydrochloric acid faster than the diluted sulphuric acid. 5

6 * Mention the factors affecting the speed of the chemical reactions * Complete the following equations:- 1) H 2 O + 1 O 2 2 2) Fe + 2 HCl + 3) N 2 O 5 + * What happens when:- 1) Putting a piece of sweet potato in a flask containing hydrogen peroxide. 2) The concentration of reactants becomes zero. 3) Adding sodium hydroxide solution to a blue copper sulphate solution. * In this reaction:- 2 H 2 O 2 catalyst 2 H 2 O + O 2 - Mention the name of the catalyst. - What is the role of the catalyst in the reaction? 6

7 Unit ( 1 ) Lesson ( 3 ) Solutions * Complete the following:- 1). is the mixture that is. in. and properties. 2) In sugary solution, the sugar is the. while the water is the. 3) The components of. and. solutions can t be separated by refining or filtration. 4). and. salts are responsible for the transfer of nerve impulses 5) Bases change the. litmus paper into. while acids change the. litmus paper into. * Give reasons for:- 1. Milk is considered a colloidal solution. 2. The green leaves of vegetables have a great benefit. 3. Calcium and magnesium minerals are very important specially for children. 7

8 * Mention one economical importance for each of the following:- 1. Silver nitrate. 2. Potassium nitrate. 3. Nitric and phosphoric acid. * Write the scientific term:- 1. A substance which is found with a smaller amount in the solution. 2. A solution whose its solute particles can t be distinguished by either the naked eye or microscope. 3. A substance whose aqueous solution contains +ve protons. 8

9 Unit ( 2 ) Lesson ( 1 ) The physical properties of the electric current * Put ( ) in front of the correct statements and correct the underlined parts in the false ones:- 1. The ammeter measures the potential difference across a conductor. ( ) 2. Joule = Ampere X volt. ( ) 3. Ampere X second = volt. ( ) Joule 4. Volt = Coulomb 5. If an electric current intensity of 3 amperes flows through a conductor in 2 minutes then the charge flowing through the ( ) conductor will be 6 coulombs. ( ) * Write the scientific term:- 1. The flow of electric negative charges in a metal The resistance of a conductor that allows the passing of an electric current of 1 ampere through it when the potential difference across its ends is 1 volt. 3. The measuring unit of the electromotive force. 4. The obstruction of the electric current during its flow through the conductor. * Give reasons for:-

10 1. The rheostat is connected in series in an electric circuit. 2. The voltmeter is connected across the two poles of a battery. * What s meant by:- 1. The electric potential. 2. Ohm s law. 3. The potential difference across a conductor of a resistance 2 ohm s is 4 volts. * What happens when:- 1. The length of the rheostat wire increases ( to the electric current ) 2. The time of flowing the electric charges through a certain crosssection of a conductor is doubled. 3. When two electrically charged conductors of different electric potential are connected by a wire. 10

11 * Problems:- 1. The potential difference between the two ends of a conductor is 6 volts and the electric current intensity passing in the conductor is 0.5 ampere what is the electric current intensity passing through the conductor if it is connected with an electric source of electric potential difference = 12 volts. 2. What s the quantity of electricity which passes through a conductor its resistance 1000 ohm for 20 minutes when the potential difference across its ends is 220 volts. * Compare the following table:- 1- Uses P.O.C Ammeter Voltammeter 2- Measuring unit 3- Its symbol in the electric circuit 4- Type of connection in the electric circuit 11

12 * Which of the following figures represents the right connection of the ammeter and voltmeter in a circuit? 12

13 Unit ( 2 ) Lesson ( 2 ) Electric current and cells * Write the scientific term:- 1. The electric current of fixed intensity and direction. 2. The electric current that is variable in both direction and intensity. 3. A type of connection of electric cells used to obtain high e.m.f. * Show by during:- 1. The direct current diagram. 2. The alternating current cycles. * G.R.F:- 1. Some cells are connected in electric circuit in parallel. 2. Electric current produced form electric generator is used in lighting and operating electric appliances. 3. The e.m.f of a battery whose cues are connected in series is greater than that one whose cells one connected in parallel. 13

14 * You have 4 similar electric cells, the electromotive force of each is 1.5 volt, explain by drawing how can you connect them to obtain an e.m.f of volts 2. 3 volts 3. 6 volts volts 14

15 Unit ( 2 ) Lesson ( 3 ) Radioactivity and nuclear energy * Write the scientific term:- 1. Atoms which have unstable nucle. 2. The measuring unit of absorbed radiation. 3. The radiation that comes from the outer space. [.. ] 4. The energy stored in the nucleus and it is librated during nuclear reactions. 5. The changes in the cells composition as a result of exposure of radiation. * Give reasons for:- 1. The nuclear energy is used to destroy mankind only is not correct. 2. Radiation has effects. 3. The radioactive cellular wastes should be buried away from underground water s path. * What s meant by:- 1. Nuclear energy. 2. Radiation pollution. 3. Rem. 15

16 * Complete:- 1. The types of radioactivity are. and. 2. Nuclear energy is used to treat and diagnose diseases like. 3. Natural radiation sources are found on the. and. rays comes from outerspace. 4. Isotopoes are atoms of the same. and with different number of. 5. The workers with radioactive material in labs or hospitals should wear.,. * Mention the difference betw. the genetic and cellular effects produced from radiation. mention the types of radioactivity. 16

17 Unit ( 3 ) Lesson ( 1 ) The main principles of heredity * Write the scientific term:- 1. The branch of science that aims to explain how different characteristics transfer through generation. [..] 2. A kind of hereditary trait that is always pure. [..] 3. The trait are not transmitted from one generation to another. [..] 4. The individual that contains 2 factors one is dominant and the other is recessive in his hereditary composition. [..] 5. The founder of heredity. [..] * Give reasons for:- - Mendel removed the stamens of pea plant flower before the maturation of the anther. - Mendel left the pea plants produced from the first generation to make self pollination. - Mendel covers the stigmas of pistils of pea flowers during studing the character of seed s colour. - In pea plant the pink flowered is considered as a dominant trait while the white flower is recessive. 17

18 * Problems:- 1) If a red ox crosses a black cow, then the two individuals of the first generation cross each other, the second generation consists of black and red individuals with ration 3:1 respectively, which of the two character is dominant and which is recessive? 2) If two pea plants one with hybrid red colour flower and the other with white flower are crossed, explain on genetic bases the result of his crossing and the ration of the red flowered plant to the with flowered planet. 3) Two wide eyes persons crossed then two of their children had wide eyes and other two had narrow eyes, Explain on genetic bases the genetic structure of Parents and the children:- * Define:- 1. Mendel 1 st law. 2. Mendel 2 nd law. 18

19 Lesson ( 2 ) Genes * Write the scientific term:- 1. Change in the nature of the hereditary factors that control the traits of the living organism. [..] 2. They are parts of DNA on the chromosomes and control the hereditary traits of the individual. [..] 3. The hereditary factors which transmit traits from the parent to the offspring. [..] 4. It s chemically consists of a nucleic acid ( DNA ) connected with protein. [..] * Give reasons for:- 1) Man needs to make some mutations artificially. 2) Some mutations are not transmitted from a generation to another. * Put ( ) or ( ):- 1- Mutation that occurs in the reproductive cells is transmitted to the offspring. ( ) 2- The genetic mutation occurs as a result of the charge the sequence of nitrogenous bases of the gene. ( ) 3- Genes are parts of DNA found in the cytoplasm of the cells. ( ) 19

20 * Explain the model of Watson and crick of the DNA structure. * What s meant by mutation, what is the difference between the mutation that occurs in the reproductive cells and that which occurs in the somatic cells. 20

21 Unit ( 4 ) Hormones in the human body * Choose:- 1- The.. hormone releases the needed energy from the food stuffs. ( growth estrogen thyroxin ) 2- The hormone which promotes the growth of ht endometrium is the hormone. ( growth progesterone insulin estrogen ) 3- The hormone which controls the percentage of calcium in the blood is hormone. ( calcitonin thyroxin insulin adrenalin ) * Give reasons for:- 1) Pituitary gland is called the master gland. 2) Pancreas is a double function gland. 3) The two adrenal have an important role when man is exposed to emergency. * What would happen:- 1) To the man when thyroxin hormone increases. 2) The growth hormone decreases during childhood. * Write the scientific term:- 1) A chemical message that controls and regulates the activities and functions of most body organs. 2) Mechanism with which hormone works inside the human body. [..] [..] 3) Glands secrete hormones. [..] 21