HOLIDAY PACKAGE

CHEMISTRY - FORM ONE

PAPER NO1

SECTION A (15 MARKS)

For each of the items (i) – (x) choose the correct answer from among given alternatives and write it on the space provided

i. Identify the skill not acquired during chemistry study……………

Careful and thorough observations
Accurate recording of what has been observed
Drawing conclusions from observations
Thorough observations and map reading skill ii. Access to safety equipment should never be blocked by any object because _________

It’s a just simple law
There must be spaces for people to move around in the laboratory
The equipment is used in every day
It's important to reach safety equipment quickly in case of an accident iii. The following apparatus is used to keep test tubes in the laboratory

Test tube rack C. Tongs
Beaker D. Test tube holder

Factors in an experiment that can be manipulated to get desired results are called

Controlled variables C. Dependent variables
Manipulated variables D. Independent variables

Which of the following is an example of a chemical change

Melting butter C. Mixing milk and
Breaking glass water

D. Burning leaves

When a small amount of common salt is dissolved in water, the mixture so formed is

A. Homogeneous C. Heterogenous B. Immiscible D. Suspension vii. Which term describes a rapid chemical reaction that releases energy in the form of light and heat?

Ignition D. Heating
Reactivity
Combustion

viii. Are those people who study chemistry practically in the past are called ______

Chemists Alchemist D.Scientist ix. Is the systematic study of nature:-		C. Al-chemistry
Science Technology x. Syrups are examples of		Chemistry Contamination
Solution Suspensions		Homogeneous mixtures Filtrate
	i.		ii.	iii.	iv.	v.	vi.	vii.	viii.	ix.	x.

Match the item in list A with the corresponding responses in list B by writing the letter of the correct response besides the item number

LIST A			LIST B
Agriculture Textile industries Transport Medicine and pharmacy Construction materials industries			Laboratory chemicals Fuels, coolants and tyres Clothes, dyes and packaging materials Paints cement, plastics and iron sheets Soft drinks Perfumes, detergents, shampoos Drugs, vaccines and food supplements Fertilizers and pesticides
LIST A	i.	ii.	iii.	iv.	v.
LIST B

SECTION B (70 MARKS)

Answer ALL questions in this section

Study the diagram given below then answer the questions that follows;-

What is the name of the apparatus above?_________________________________________
What is the function of the apparatus?________________________________________________________________________________________________________________________________
What are the functions of the labeled parts;-

P___________________________________________________________________

E___________________________________________________________________

S___________________________________________________________________

A___________________________________________________________________

What will you do if the above mentioned apparatus is not in the laboratory to save the same function?

_____________________________________________________________ _____

(a) Your teacher may advise you on things you should never do in the laboratory. For each of the rules below, write what might happen if you never followed the instructions?

i. Never enter in the laboratory without permission

_____________________________________________________________________________________________________________________________________

ii. Never quarrel or fight in the laboratory

________________________________________________________________________________________________________________________________________

iii. Never throw any solid into the sink or waterways

________________________________________________________________________________________________________________________________________

iv. Replace the cover after using the chemicals

____________________________________________________________________

v.Never use laboratory apparatus for drinking or storing food

____________________________________________________________________________________________________________________________________________________

Draw the warning symbol you would expect to see on

A can of petrol
A bottle of concentrated sulphuric acid

a) Mkwawi a form one student at Lake Tanganyika secondary school accidentally mixed sulphur and iron fillings

Suggest an appropriate method of separation you would advise him to use to separate the mixture

_________________________________________________________________________

Give a reason for the choice of your answer

___________________________________________________________________________

Describe how he would use the method named above to separate the sulphur and iron fillings

________________________________________________________________________

(b)(i)Name two substances that sublime when heated

________________________________________________________________________

(ii) Why is water not a suitable solvent in paper chromatography?

________________________________________________________________________

Bleeding is the loss of blood and other fluids from the body when the skin breaks. As a student, identify procedures when dealing with a victim of a small cut or wound.

i)________________________________________________________________________

ii)________________________________________________________________________

iii)________________________________________________________________________

iv)________________________________________________________________________

v)________________________________________________________________________

vi)________________________________________________________________________

(a) Effective use of four senses of observation is important before a chemist can make a conclusion. With four (4) points, show how the senses are used as tools of observation during experimentation by giving one example for each.

________________________________________________________________________

__________________________________________________________________________________________________________________

b) Is chemistry related to your environment? Explain.

________________________________________________________________________

________________________________________________________________________________________________________________________________________________

________________________________________________________________________

____________________________________

a) Why is a flame produced by a candle not suitable for cooking? Give two reasons

i) _________________________________________________________________________

ii)

___________________________________________________________________________

b) Give four differences between a flame produced when the air holes of a Bunsen burner are open and the one produced when the air holes are closed

Flame produced when air holes are open	Flame produced when air holes are closed
i)
ii)
iii)
iv)

8. a) Identify each of the following statements as an observation or a hypothesis

A silver tray turns a dull gray color when left uncovered _________________________________
North of the equator, it is warmer in summer than in winter

______________________________

Ice cubes float in water because they are less dense

____________________________________

b) Outline four significance of scientific producers in daily life

_____________________________________________________________________________

ii)

______________________________________________________________________________

iii)

______________________________________________________________________________

iv)_____________________________________________________________________________

v) ________________________________________________________________________ ______

9. Robert Msaki placed a large crystal of Potassium permanganate (VII) in the bottom of a beaker of cold water and left it for several hours

Explain what she must have observed after five minutes. Explain

Describe what she likely observed after several hours. Explain

Name the two processes which have taken place.

______________________________________________________________________________

From that experiment give two conclusions about matter

SECTION C (15 Marks)

Answer question number ten (10)

10. (a) Draw a well labeled diagram of a small laboratory heat source consisting of a vertical metal tube connected to a gas source

Describe how you will light a device drawn above

i)______________________________________________________________________ ii)______________________________________________________________________ iii)_____________________________________________________________________

iv)_____________________________________________________________________

Burning back of the device drawn above is corrected as follows

PAPER No. 02

SECTION A (15 MARKS)

1. For each of the items (i) – (x) choose the correct answer from among given alternatives and write it on the space provided

xi. Identify the skill not acquired during chemistry study……………

Careful and thorough observations
Accurate recording of what has been observed
Drawing conclusions from observations
Thorough observations and map reading skill

xii. Access to safety equipment should never be blocked by any object because _________

It’s a just simple law
There must be spaces for people to move around in the laboratory
The equipment is used in every day
It's important to reach safety equipment quickly in case of an accident xiii. The following apparatus is used to keep test tubes in the laboratory

Test tube rack G. Tongs
Beaker H. Test tube holder

Factors in an experiment that can be manipulated to get desired results are called

Controlled variables G. Dependent variables
Manipulated variables H. Independent variables

Which of the following is an example of a chemical change

Melting butter G. Mixing milk and
Breaking glass water

H. Burning leaves

When a small amount of common salt is dissolved in water, the mixture so formed is

E. Homogeneous G. Heterogenous F. Immiscible H. Suspension xvii. Which term describes a rapid chemical reaction that releases energy in the form of light and heat?

E. Ignition G. Combustion F. Reactivity H. Heating

xviii. Are those people who study chemistry practically in the past are called ______

Chemists F. Al-chemistry
Alchemist D.Scientist

xix. Is the systematic study of nature:-

Science G. Chemistry
Technology H. Contamination

xx. Syrups are examples of

Solution G. Homogeneous
Suspensions mixtures

H. Filtrate

xi.	xii.	xiii.	xiv.	xv.	xvi.	xvii.	xviii.	xix.	xx.

2.Match the item in list A with the corresponding responses in list B by writing the letter of the correct response besides the item number

LIST A	LIST B
	Round bottomed flask Ice cubes Crystals of iodine Wire gauze Tripod stand Mixture of sand and iodine Heat Sublimation
LIST A		A	B	C	D	E
LIST B

SECTION B (70 MARKS)

3.(a) Is air a mixture or a compound? Argue this statement by using four points,

(b) Solvent extraction is the method of separating one substance from one more substance by using a solvent, but the solvent must fulfill four conditions. What are they?

i. ____________________________________________________________________________

ii. ___________________________________________________________________________

iii. ___________________________________________________________________________

iv. ___________________________________________________________________________

4. (a) Draw a well labeled diagram to show a method responsible for separation of a mixture of ethanol and water.

(b) Briefly explain why in the method above the thermometer is fitted at the top of the fractionating column?

5 a) What is your answer when someone ask you to write the Latin name and symbol of Mercury, Tin and Tungsten

(b) List down five elements with their corresponding chemical symbols which starts with letter C

i).__________________________________________________________________________________

ii). _________________________________________________________________________________

iii) _________________________________________________________________________________

iv) _________________________________________________________________________________

6. a) On your way back home, you hear two students arguing that chemical symbols have no importance because they confuse scientists. How will you correct their argument by using four points?

i. _______________________________________________________________________-__________

ii. _________________________________________________________________________________

iii. ________________________________________________________________________________

iv. ________________________________________________________________________________

b) Compete the given table below

TERM	MEANING
i) Ductile
ii) Sonorous
iii) Malleable
iv) Lustrous

7. (a) Describe three examples which shows that matter is made up of particles that are in constant motion

i. ________________________________________________________________________________

ii. _______________________________________________________________________________

iii. ________________________________________________________________________________

(b) Describe how the importance of matter changing from one state to another can be explained in terms like metallurgy and steam engines

________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

8. (a) Cars and corrugated iron sheets in coastal towns like Dar- es- salaam, Tanga and Zanzibar are found to rust more quickly than in other cities in Tanzania like Songea, Mwanza or Arusha. Why is this?

(b) A saturated solution is the one in which the solvent can dissolve no more solute at a given temperature and pressure also the concept of saturation can be applied when

i)__________________________________________________________________________________ ii)__________________________________________________________________________________

9. How can the following mixture be separated

(i) Sugar solution

(ii Mixture of rice and sand

Mud from muddy water
Chlorophyll from green leaves
Water from mixture of water and alcohol
Water from mixture of water and paraffin
Pure water from impure water
Iodine from mixture of iodine and sodium chloride salt
Water and salt
Ammonium chloride and sodium chloride salt

SECTION C (15 Marks)

Answer question number 10 in this section

10. (a) At your home the fire breaks out suddenly and you are chosen to put part of that fire by using a fire extinguisher. Explain how you can use a fire extinguisher and what precautions can you take so as to avoid occurrence of other accidents.

(b) Why is it not advised to use water to extinguish class B and C fires?

PAPER No. 03

SECTION A (15 MARKS)

Answer ALL questions

1. Write down the letter of the most correct Responses for each of the following questions.

If a Bunsen flame produces most soot which is the correct conclusion.
1. The air hole is closed
2. The burner gas jet is big ( )
3. The air hole fully opened
4. The gas supply is poor
The state of matter are:-
1. Element ,Gas, and Mixture
2. Liquid, Moisture and Element ( )
3. Water ,moisture and solid
4. Gas, liquid and solid
Juma applied the knowledge of scientific procedures in solving his daily problems. One of the stages of scientific procedure is experimentation. In scientific procedures experiments used to test which from the choices given?
1. Data
2. Problems( )
3. Hypothesis
4. Observation
The substance that can burn your skin is best described as
1. Flammable
2. Corrosive ( )
3. Explosive
4. Toxic
Which of the following sets of apparatus suitable for measuring volume of solution s
1. Burette, pipette, and beaker
2. Burette , pipette, and conical flask
3. Measuring cylinder, burette and pipette ( )
4. Burette, flat bottomed flask and pipette
Flammable chemicals are the ones which can
1. Catch fire easily
2. Explode easily
3. Poison you ( )
4. Burn skin
_________ are conditions or factors that can change in an experiment
1. Hypothesis
2. Variables ( )
3. Problems
4. Conclusion
A branch of chemistry which deals with studies and uses of instruments and methods which used to separate, identify, and quantify, chemical species in matter?
1. Inorganic chemistry
2. Analytical chemistry ( )
3. Instrumental chemistry
4. Biochemistry
Which branch of chemistry deals with the studies of carbon and its compound?
1. In organic chemistry
2. Organic chemistry ( )
3. Biochemistry
4. Analytical chemistry

Why is loose or floppy clothing not clawed in the laboratory?
1. It will help move fast
2. It will get wet when water splashes
3. It may catch fire or cause one to fall ( )
4. It cause poor ventilation in the body

LIST A

LIST B

i) A process of a separating mixture of sodium chloride and ammonium chloride. ii) A method used to separate kerosene and water

A method by which salt and water can be separated
A method used to get solvent from solution mixture
A method by which coloured substances are separated and identified

sublimation
Boiling
Chromatography
Distillation
Evaporation
Filtration
Layer separation
Decantation

SECTION B (70 Marks)

Answer ALL questions

What are considered to be the main distinctions between a chemical compound and a mixture? (5points) Explain why the liquid obtained by mixing sodium chloride with water is not regarded as a chemical compound.
A form one student from UBN secondary school prepares experimental set up A as follows. Then they pour water into a beaker followed by addition of kerosene to obtain a mixture X. Then they pour the mixture X in an experimental set A. Apply the knowledge you obtain from chemistry lessons answer the questions that follow

Identify the experimental set up A
Identify the mixture X
What is an aim of the demonstrated Experiment
Which liquid do you drain first? Give reason

(a) Explain why there is an increase in weight when iron gets rust.
1. Mention ways in which the burning in air of magnesium and rusting of iron differ (4points)
(a) A form one student from UBN SECONDARY reads a statement from a certain book that, ‘‘if the clothes worn by your friend catch fire, cover them with a fire blanket’’ Why is a fire blanket to be used in that case?
1. Explain the Effect of Rust in your Environment.
2. You are given the components of air in the table bellow. Answer the question below.

GAS	APPROXIMETE PERCENTAGE(%)
Nitrogen	78
Oxygen	21
Noble gas	0.94
Carbon dioxide	0.03
Water vapour	0.4

What does percentage indicate?

With the aid of well labelled diagram explain how Bunsen burner work
(a) Once Mr Msaki opens a container which contains hot soup in the room, people in different parts of the room notice the smell of the soup. You as a form one student explain by using kinetic theory of matter how this happens.
1. Water vapour is a matter? Explain your answer
2. Why does the wax of the candle melt after a few seconds when the candle is ignited? Explain
There are various types of solutions. The solute and solvent can be in any state of Matter. The table below shows a mixture of different solutes and solvents in different states to form solutions. Fill the table by giving common examples

solute	solvent	Examples
solid	gas
solid	liquid
solid	solid
liquid	Gas
liquid	liquid
liquid	solid
gas	gas
gas	liquid
gas	solid

SECTION C (15 Marks)

Answer question number 10 in this section

use tick and cross to fill the table

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🌊PAPER 31-Qns

SECTION B (70 MARKS)

Answer ALL questions in this section

PAPER No. 02

SECTION A (15 MARKS)

SECTION B (70 MARKS)

PAPER No. 03

SECTION A (15 MARKS)

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