Followings are tips worth pondering for your coming test...
1) Make sure you know the differences between scalar and vector quantities. You also need to know how to categorise some of the commonly used quantities between these two.
2) You ought to know all the Newton's Laws of Motion inside out.
3) You also need to know all the formulae within these two chapter.
4) Make sure you know the types of friction.
5) Calculations wise, please note the following;
a) Know how to calculate displacement.
b) Know how to calculate lever (Principle of Moment)
c) Know how to handle pulley systems.
d) Know how to solve energy problems.
Saturday, July 21, 2012
Saturday, March 31, 2012
1st Term Exam Tips for Junior 3 SCIENCE 2012
Exam coverage: Form 1 PMR: ALL chapters (chap 1 – chap 7)
Form 3 PMR: Chapters 1 to 5
Junior 3 UEC: Chapter 19 to 22 (last four chapters of the textbook)
a) Must revise the set of questions given during the March Holidays class. All Form 1 PMR questions in Paper 2 come directly from this set of questions.
b) It pays if you can glance through your Form 1 PMR Volume 1 and Volume 2 textbooks.
2. Form 3 PMR section
Chapter 1 – Respiratory System
a) Pathway of inhale and exhale air. Refer to the diagram in page 2.
b) Know the working mechanics of the model of the human respiratory system in page 3.
c) Should understand the process of gas exchange between alveoli and the capillaries. (pg 5)
d) Should know all about haemoglobin; its colour, its type and its function (pg 5)
e) Aware of the air pollutants, its effects and its source. (pg 6 – 8)
f) Respiratory diseases that are caused by air pollutants. (pg 8 & ) Note: Tuberculosis (TB) is not considered here because it is not caused by air pollutants but by bacteria.
g) Must understand the working mechanics of the apparatus used to observed and identify harmful substances in cigarette smoke. (pg 10)
Chapter 2 – Blood Circulatory System in Human and Transport System in Plants
a) Direction of flow of blood within the heart as well as the heart structure. (pg16)
b) Know all that you can about the three types of blood vessel. (pg 17 & 18) Note: Refer to your notes taken during lesson will be extremely helpful.
c) Understand the constituents of blood and their functions (pg 20 & 21)
d) Be clear about human blood group. (pg 21) Note: If you have time, it is good to refer to Junior 2 UEC textbook page 261 to page 264 to have better understanding on point (c) and point (d).
e) Know the definition of transpiration (pg 23), rate of transpiration (pg 24) and the roles of transpiration (pg 27).
f) Have a general understanding of vascular bundle.
Chapter 3 – Excretory System
a) Type of excretory system organs in human and their excretion. (pg 35)
b) Must know the structure and labels of both human urinary system and the internal structure of kidney. (pg 36 & 37)
c) Have a basic knowledge know of the function of kidney and the dialysis machine can be very helpful.
d) There are only two excretory ways mentioned about plants in this chapter; through stomata and by shedding. Should know how to differentiate both and what they excrete. Have basic knowledge of helpful and harmful excretory products of plants. (pg 39 & 40)
Chapter 4 – Reproduction (merge this chapter with Chapter 20 of the UEC textbook)
a) Why reproduce? (PMR pg 46) Types of reproduction? (PMR pg 46) Ways of reproduction of each type? (PMR pg 46 – 48 & UEC pg 269 – 270)
b) Reproduction in insects – metamorphosis (UEC pg 272); Reproduction in fish – oviparity and ovoviviparity (UEC pg 273); Reproduction of amphibian (frog) – from tadpole to frog (UEC pg 273); Reproduction of bird – cloaca and single ovary (UEC pg 274) and structure of egg (UEC pg 275).
c) Male and female reproductive organ in human and the function or description of each parts. (PMR pg 50 – 51; UEC pg 275 – 276).
d) Pregnancy (PMR pg 55 – 56 ; UEC pg 279) Note: The diagram you are asked to copy during lesson on the stages of pregnancy is very very very very very very very helpful.
e) Understand twins (UEC pg 282)
f) Sterility (PMR pg 58) and birth control (PMR pg 59 – 60). Note: Clear about IVF (PMR pg 59) and the difference about vasectomy and ligation (PMR pg 60)
g) Reproduction in flowering plants is all about three very important words.
i) Pollination (PMR pg 64 – 66)
ii) Fertilisation (PMR pg 67)
iii) Germination (PMR pg 69 – 72)
h) Basic knowledge about vegetative reproduction will be sufficient.
Chapter 5 – Human Growth
a) Understand the growth curve of human. (pg 83)
b) Know the growth curve of boys and girls. (pg 84)
3. Junior 3 UEC section
Chapter 19 – Endocrine System
a) Get through page 266 and page 267
Chapter 20 – Reproduction
Refer to the points in Form 3 PMR section under Chpater 4 – Reproduction.
Chapter 21 – Heredity
a) Definition of terminologies
i) heredity (pg 287)
ii) chromosome (pg 287)
iii) gene (pg 287)
iv) alleles (pg 287)
v) dominant and recessive (pg 287)
vi) homozygous and heterozygous (pg 290)
vii) autosomes (pg 291)
viii) mutation (pg 293)
b) Must be able to draw heredity chart like the ones shown in page 291 and 292.
c) Heredity diseases (pg 293)
Chapter 22 – Ecology
a) Biotic and Abiotic factors (pg 296 and 297)
b) Food chain and food web (pg 297)
c) Terminologies used for interaction of living organisms. (pg 298 – 300)
d) Nitrogen cycle (pg 301)
e) Types of ecosystems (pg 302)
Please note:
This list is quite exhaustive but in reality, it is quite direct. It is helpful to note that you should not spend more than 30 minutes on any of the chapters. Basically you only need to give a full 1 hour for each section with preferably 15 minutes break in between each section.
Form 3 PMR: Chapters 1 to 5
Junior 3 UEC: Chapter 19 to 22 (last four chapters of the textbook)
Exam format: Paper 1 – 50 objective questions (50%)
Paper 2 – 9 structured questions (50%)Marks distribution: About 30% are allocated to Form 1 PMR questions while the rest go to Form 3 PMR and Junior 3 UEC questions.
Points to note:
1. Form 1 PMR sectiona) Must revise the set of questions given during the March Holidays class. All Form 1 PMR questions in Paper 2 come directly from this set of questions.
b) It pays if you can glance through your Form 1 PMR Volume 1 and Volume 2 textbooks.
2. Form 3 PMR section
Chapter 1 – Respiratory System
a) Pathway of inhale and exhale air. Refer to the diagram in page 2.
b) Know the working mechanics of the model of the human respiratory system in page 3.
c) Should understand the process of gas exchange between alveoli and the capillaries. (pg 5)
d) Should know all about haemoglobin; its colour, its type and its function (pg 5)
e) Aware of the air pollutants, its effects and its source. (pg 6 – 8)
f) Respiratory diseases that are caused by air pollutants. (pg 8 & ) Note: Tuberculosis (TB) is not considered here because it is not caused by air pollutants but by bacteria.
g) Must understand the working mechanics of the apparatus used to observed and identify harmful substances in cigarette smoke. (pg 10)
Chapter 2 – Blood Circulatory System in Human and Transport System in Plants
a) Direction of flow of blood within the heart as well as the heart structure. (pg16)
b) Know all that you can about the three types of blood vessel. (pg 17 & 18) Note: Refer to your notes taken during lesson will be extremely helpful.
c) Understand the constituents of blood and their functions (pg 20 & 21)
d) Be clear about human blood group. (pg 21) Note: If you have time, it is good to refer to Junior 2 UEC textbook page 261 to page 264 to have better understanding on point (c) and point (d).
e) Know the definition of transpiration (pg 23), rate of transpiration (pg 24) and the roles of transpiration (pg 27).
f) Have a general understanding of vascular bundle.
Chapter 3 – Excretory System
a) Type of excretory system organs in human and their excretion. (pg 35)
b) Must know the structure and labels of both human urinary system and the internal structure of kidney. (pg 36 & 37)
c) Have a basic knowledge know of the function of kidney and the dialysis machine can be very helpful.
d) There are only two excretory ways mentioned about plants in this chapter; through stomata and by shedding. Should know how to differentiate both and what they excrete. Have basic knowledge of helpful and harmful excretory products of plants. (pg 39 & 40)
Chapter 4 – Reproduction (merge this chapter with Chapter 20 of the UEC textbook)
a) Why reproduce? (PMR pg 46) Types of reproduction? (PMR pg 46) Ways of reproduction of each type? (PMR pg 46 – 48 & UEC pg 269 – 270)
b) Reproduction in insects – metamorphosis (UEC pg 272); Reproduction in fish – oviparity and ovoviviparity (UEC pg 273); Reproduction of amphibian (frog) – from tadpole to frog (UEC pg 273); Reproduction of bird – cloaca and single ovary (UEC pg 274) and structure of egg (UEC pg 275).
c) Male and female reproductive organ in human and the function or description of each parts. (PMR pg 50 – 51; UEC pg 275 – 276).
d) Pregnancy (PMR pg 55 – 56 ; UEC pg 279) Note: The diagram you are asked to copy during lesson on the stages of pregnancy is very very very very very very very helpful.
e) Understand twins (UEC pg 282)
f) Sterility (PMR pg 58) and birth control (PMR pg 59 – 60). Note: Clear about IVF (PMR pg 59) and the difference about vasectomy and ligation (PMR pg 60)
g) Reproduction in flowering plants is all about three very important words.
i) Pollination (PMR pg 64 – 66)
ii) Fertilisation (PMR pg 67)
iii) Germination (PMR pg 69 – 72)
h) Basic knowledge about vegetative reproduction will be sufficient.
Chapter 5 – Human Growth
a) Understand the growth curve of human. (pg 83)
b) Know the growth curve of boys and girls. (pg 84)
3. Junior 3 UEC section
Chapter 19 – Endocrine System
a) Get through page 266 and page 267
Chapter 20 – Reproduction
Refer to the points in Form 3 PMR section under Chpater 4 – Reproduction.
Chapter 21 – Heredity
a) Definition of terminologies
i) heredity (pg 287)
ii) chromosome (pg 287)
iii) gene (pg 287)
iv) alleles (pg 287)
v) dominant and recessive (pg 287)
vi) homozygous and heterozygous (pg 290)
vii) autosomes (pg 291)
viii) mutation (pg 293)
b) Must be able to draw heredity chart like the ones shown in page 291 and 292.
c) Heredity diseases (pg 293)
Chapter 22 – Ecology
a) Biotic and Abiotic factors (pg 296 and 297)
b) Food chain and food web (pg 297)
c) Terminologies used for interaction of living organisms. (pg 298 – 300)
d) Nitrogen cycle (pg 301)
e) Types of ecosystems (pg 302)
Please note:
This list is quite exhaustive but in reality, it is quite direct. It is helpful to note that you should not spend more than 30 minutes on any of the chapters. Basically you only need to give a full 1 hour for each section with preferably 15 minutes break in between each section.
Good luck…
Thursday, January 5, 2012
For KOKUM Fencers 2011/2012
1. Understand how deadly sword fights evolve into a recreational sport.
2. Have good understanding on the important historic figures of the fencing world.
3. Able to differentiate the different weapons and the personalities of each weapon.
4. Technical understanding on the rules and important concepts of fencing.
5. Know as much as possible about the Olympics and its connection to fencing.
6. Brief understanding on the technicalities of weapons.
7. Answers for soft-skill questions are not definite but need to encompass logical common sense.
These are ONLY guides to assist you in your preparation. Good luck...
2. Have good understanding on the important historic figures of the fencing world.
3. Able to differentiate the different weapons and the personalities of each weapon.
4. Technical understanding on the rules and important concepts of fencing.
5. Know as much as possible about the Olympics and its connection to fencing.
6. Brief understanding on the technicalities of weapons.
7. Answers for soft-skill questions are not definite but need to encompass logical common sense.
These are ONLY guides to assist you in your preparation. Good luck...
Saturday, October 1, 2011
J2 Math Tips for Finals 2011
Section A: Objective Questions with 4 choices. Total 20 questions. 2 marks per correct answer. Total score is 40%.
Questions' distributions are as follow;
- Chapter 1, 2, 3, 6, and 8 will take up 8 of the 20 questions of Section A. Questions are based on numerical calculations.
- Chapter 10, 11, 12, 13, 14 and 15 will take up the remaining 12 questions. On average, 2 questions will come from each of these last 6 chapters.
Section B: Subjective Questions. Total 6 questions with sub-questions that add up to 10 marks per question. Total score is 60%.
Questions' distributions are as follow;
Chapter 10: Volume and Surface Area - 1 question
This is a diagram based question. Good revision exercises are RevEx10i (pg 203-206) questions 2 to 7, Past Year Questions 2004, P2 - 6(b), Past Year Question 2003, P2 - 6(a) and Past Year Question 2002, P2 - 6(b)
Chapter 11: Construction - 1 question
You need to have your compass, protractor and ruler ready for this chapter. This is skill based question where you need to draw the required angles and shapes. Base on your Math textbook, you need to know how to draw (A) and (B) on pg 210, (C) and (E) on pg 211, (F) and (H) on pg 212 and (I) on pg 215. Good revision exercises are Ex11a (pg216-217) all questions and Practice 18, 19 and Summative Test 7 of your blue workbook (pg27-31).
Chapter 12: Geometrical Transformations - 1 question
This question comes with 5 sub-questions. All sub-questions will be drawn on square grids. These sub-questions are as follow;
a) Reflection - Good revision exercise is Practice 33 of the blue workbook (pg50)
b) Translation - You MUST know the math behind translation matrix. Good revision exercises are Practice 32 of the blue workbook (pg49) and Ex12c (pg231-232) question 5-10.
c) Rotation - Determining the image of the rotated object. Good revision exercise is Ex12e (pg239-240) question 4-9.
d) Rotation - Determining the centre and angle of rotation. Good revision exercises are Ex12f (pg242-243) questions 3-5 and Practice 34 of the blue workbook (pg51 - also applicable to (c)).
e) Enlargement - Good revision exercises are Ex12g (pg247) and Ex12h (pg250) all questions.
Chapter 13: Sets - 1 question
You either need to sketch Venn diagrams based on the given expression or you need to identify the expression based on the given Venn diagrams. Good revisions and exercises are pg282 - further examples on Venn diagrams, Ex13l (pg286-288) questions 25-31 and RevEx13n (pg294-295) questions 24-26.
Chapter 14: Application of Sets - 1 question
2 sets formulation on pg299 and 3 sets formulation on pg306 is crucial for this question. You also need to be able to identify the least and greatest number based on 2 sets. Good revision exercises are Ex14a (pg301) questions 10-15, RevEx14d (pg312-314) question 8-20, 2004 (PYQ) P2 - 2, 2003 (PYQ) P2 - 2 and 2002 (PYQ) P2 - 2.
Chapter 15 - Counting System - 1 question
You need to know the conversions between decimal, octal and binary numbers as well as the arithmetic operational calculations. This question will be EXTREMELY creative and confusing but not necessarily challenging. Good revision exercise will be RevEx15f (pg325) all questions.
Some important reminders:
- This is a one and a half hour paper. Though the questions might not be too difficult, time can be a real challenge. So make sure you don't waste time.
- You need to bring your COMPASS, RULER and protractor for this exam. However calculators are NOT allowed.
GOOD LUCK
Questions' distributions are as follow;
- Chapter 1, 2, 3, 6, and 8 will take up 8 of the 20 questions of Section A. Questions are based on numerical calculations.
- Chapter 10, 11, 12, 13, 14 and 15 will take up the remaining 12 questions. On average, 2 questions will come from each of these last 6 chapters.
Section B: Subjective Questions. Total 6 questions with sub-questions that add up to 10 marks per question. Total score is 60%.
Questions' distributions are as follow;
Chapter 10: Volume and Surface Area - 1 question
This is a diagram based question. Good revision exercises are RevEx10i (pg 203-206) questions 2 to 7, Past Year Questions 2004, P2 - 6(b), Past Year Question 2003, P2 - 6(a) and Past Year Question 2002, P2 - 6(b)
Chapter 11: Construction - 1 question
You need to have your compass, protractor and ruler ready for this chapter. This is skill based question where you need to draw the required angles and shapes. Base on your Math textbook, you need to know how to draw (A) and (B) on pg 210, (C) and (E) on pg 211, (F) and (H) on pg 212 and (I) on pg 215. Good revision exercises are Ex11a (pg216-217) all questions and Practice 18, 19 and Summative Test 7 of your blue workbook (pg27-31).
Chapter 12: Geometrical Transformations - 1 question
This question comes with 5 sub-questions. All sub-questions will be drawn on square grids. These sub-questions are as follow;
a) Reflection - Good revision exercise is Practice 33 of the blue workbook (pg50)
b) Translation - You MUST know the math behind translation matrix. Good revision exercises are Practice 32 of the blue workbook (pg49) and Ex12c (pg231-232) question 5-10.
c) Rotation - Determining the image of the rotated object. Good revision exercise is Ex12e (pg239-240) question 4-9.
d) Rotation - Determining the centre and angle of rotation. Good revision exercises are Ex12f (pg242-243) questions 3-5 and Practice 34 of the blue workbook (pg51 - also applicable to (c)).
e) Enlargement - Good revision exercises are Ex12g (pg247) and Ex12h (pg250) all questions.
Chapter 13: Sets - 1 question
You either need to sketch Venn diagrams based on the given expression or you need to identify the expression based on the given Venn diagrams. Good revisions and exercises are pg282 - further examples on Venn diagrams, Ex13l (pg286-288) questions 25-31 and RevEx13n (pg294-295) questions 24-26.
Chapter 14: Application of Sets - 1 question
2 sets formulation on pg299 and 3 sets formulation on pg306 is crucial for this question. You also need to be able to identify the least and greatest number based on 2 sets. Good revision exercises are Ex14a (pg301) questions 10-15, RevEx14d (pg312-314) question 8-20, 2004 (PYQ) P2 - 2, 2003 (PYQ) P2 - 2 and 2002 (PYQ) P2 - 2.
Chapter 15 - Counting System - 1 question
You need to know the conversions between decimal, octal and binary numbers as well as the arithmetic operational calculations. This question will be EXTREMELY creative and confusing but not necessarily challenging. Good revision exercise will be RevEx15f (pg325) all questions.
Some important reminders:
- This is a one and a half hour paper. Though the questions might not be too difficult, time can be a real challenge. So make sure you don't waste time.
- You need to bring your COMPASS, RULER and protractor for this exam. However calculators are NOT allowed.
GOOD LUCK
Friday, July 8, 2011
J3 Sci ExamTips 4 2nd Term Exam '11
Paper 1: 50 questions. Every question is based on PMR syllabus.
Revise the Form 1, 2 and 3 workbooks. Also good to do the objective questions at the end of every chapter from Form 1 to Form 3 chapter 6. Average about 2 questions from each chapter.
Paper 2: This paper is divided into Biology, Chemistry and Physics sections and it follows the Jr UEC exam syllabus.
Section A: Biology - Answer any 2 of the 3 questions.
1st question: Plants
There are six things about plants that you must know. These are
1) Pollination
2) Fertilisation
3) Germination
4) Respiration
5) Transpiration
6) Photosynthesis
The question will be on one of these.
2nd question: Bodily systems of human
One of the following systems will be used for this question.
1) Digestive system
2) Blood circulatory system
3) Respiratory system
4) Reproductive system
3rd question: dLL
Pay attention to any one of the following.
1) Nutrition
2) Microorganism
3) Ecosystem
4) Heredity
Section B: Chemistry - Answer any 2 of the 3 questions.
1st question: Very chemistry
Focus on chapter 10, 11, 14 and 15 of J2 textbook. Question SHOULD (but can't really remember) include
1) chemical names and equations
2) valencies and molecular mass
3) acid and base with pH knowledge
4) reaction types
5) basic understanding of periodic table
2nd question: Metal and non-metal
Focus on chapter 8 and 9 of J2 textbook. Need to know everything as mentioned in these chapters.
3rd question: States of matter
Focus on chapter 5, 6 and 7 of J2 textbook. Need to know everything about solid, liquid and gas...
Section C: Physics - Answer any 1 of the 2 questions.
1st question: Chapter 1 - 5 of Jr 3 textbook
2nd question: Chapter 6 - 10 of Jr 3 textbook
Pay very special, very keen, very focused attention to all the subjective questions at the end of every chapter.
Good luck... people...
Revise the Form 1, 2 and 3 workbooks. Also good to do the objective questions at the end of every chapter from Form 1 to Form 3 chapter 6. Average about 2 questions from each chapter.
Paper 2: This paper is divided into Biology, Chemistry and Physics sections and it follows the Jr UEC exam syllabus.
Section A: Biology - Answer any 2 of the 3 questions.
1st question: Plants
There are six things about plants that you must know. These are
1) Pollination
2) Fertilisation
3) Germination
4) Respiration
5) Transpiration
6) Photosynthesis
The question will be on one of these.
2nd question: Bodily systems of human
One of the following systems will be used for this question.
1) Digestive system
2) Blood circulatory system
3) Respiratory system
4) Reproductive system
3rd question: dLL
Pay attention to any one of the following.
1) Nutrition
2) Microorganism
3) Ecosystem
4) Heredity
Section B: Chemistry - Answer any 2 of the 3 questions.
1st question: Very chemistry
Focus on chapter 10, 11, 14 and 15 of J2 textbook. Question SHOULD (but can't really remember) include
1) chemical names and equations
2) valencies and molecular mass
3) acid and base with pH knowledge
4) reaction types
5) basic understanding of periodic table
2nd question: Metal and non-metal
Focus on chapter 8 and 9 of J2 textbook. Need to know everything as mentioned in these chapters.
3rd question: States of matter
Focus on chapter 5, 6 and 7 of J2 textbook. Need to know everything about solid, liquid and gas...
Section C: Physics - Answer any 1 of the 2 questions.
1st question: Chapter 1 - 5 of Jr 3 textbook
2nd question: Chapter 6 - 10 of Jr 3 textbook
Pay very special, very keen, very focused attention to all the subjective questions at the end of every chapter.
Good luck... people...
Wednesday, April 6, 2011
J2 Factorisation Exercises - ANSWERS
7. 2(-x + 5)(x - 1)
8. (x + 1)(x - 2)
9. 2(y + 2)(y - 1)
10. 3(y + 1)(y - 5)
11. (3x + 2)(x - 2)
12. 2(x - 4)(x - 3)
13. 2(x - 5)(x + 2)
14. -
15. (x - 5)(x + 1)
16. -
17. (x + 3)(x - 2)
18. (x - 2)(x - 4)
19. (2x + 1)(x - 3)
20. 2(x - 1)(2x - 1)
21. (x + 3)(x - 3)
22. (x + 5)(x - 5)
23. (-4x - 3)(x - 1)
24. (x - 4)(x + 6)
25. (2x - 9)(x + 2)
8. (x + 1)(x - 2)
9. 2(y + 2)(y - 1)
10. 3(y + 1)(y - 5)
11. (3x + 2)(x - 2)
12. 2(x - 4)(x - 3)
13. 2(x - 5)(x + 2)
14. -
15. (x - 5)(x + 1)
16. -
17. (x + 3)(x - 2)
18. (x - 2)(x - 4)
19. (2x + 1)(x - 3)
20. 2(x - 1)(2x - 1)
21. (x + 3)(x - 3)
22. (x + 5)(x - 5)
23. (-4x - 3)(x - 1)
24. (x - 4)(x + 6)
25. (2x - 9)(x + 2)
Friday, April 1, 2011
Questions on Heat for J2 and J3
Heat Problems
1. Calculate the heat energy required to heat 200.0 g of water for soup from 10 degree C to boiling point.
2. What amount of heat is needed to heat 50.0 kg of water in a dishwasher from 10 degree C to 70 degree C?
3. You have 2.50 kg of mercury at 22 degree C. You find that it requires 3.20 x 103 J of energy to raise its temperature to 32 degree C. Calculate the specific heat capacity of mercury.
4. To raise the temperature of 400.0 g of gold from 50 degree C to 75 degree C, 1.3 kJ of energy is needed. What is the specific heat capacity of gold?
5. A piece of metal with a mass of 500.0g is put into boiling water until it is the same temperature as the boiling water. It is then transferred very quickly into 200.0g of water, which is 20 degree C. The final temperature of the water and metal is 30 degree C.
a) How many joules of energy did the 200.0 g of water absorb as it was heated?
b) How many joules of energy did the metal release as it cooled?
c) What is the specific heat of the metal?
6. To cool 400. g of a solid having an initial temperature of 85 degree C, you put it into 200.g of water at 15 degree C. If the final temperature of the solid and water is 35 degree C, determine the specific heat capacity of the unknown substance.
7. 3.00 x 104 J of heat energy is added to a 1.00 kg block of aluminum that has an initial temperature of 10 degree C. The specific heat for aluminum is 9.20 x 102 J/kg°C. Calculate the final temperature.
8. An unknown piece of metal that has 0.200 kg mass is heated to 350 degree C. It is quickly placed in 0.250 kg of water at 20 degree C, which is contained in a 225 g aluminum calorimeter. The final temperature of the metal, water, and calorimeter is 38 degree C. What is the specific heat capacity of the unknown metal?
9. A 10.0 kg piece of brass at 71 degree C is placed in 20.0 kg of water that is 10 degree C. What is the final temperature of the brass and water?
Latent Heat Problems
1. Which takes more heat, melting ice or evaporating water?
2. Explain why ice is useful in coolers.
3. How much heat is given off when 3.2 kg of water freeze? Assume the temperature stays constant at 0ºC.
4. How much heat is required to change 2.5 kg of water at 20ºC to steam at 150ºC?
5. How much heat is needed to change 2.0 kg of silver at 20ºC into liquid silver? Silver melts at 961ºC.
6. How much heat is needed to change 0.50kg of ice at –20ºC into steam at 120ºC?
7. How much heat is released when 500g of steam at 250ºC is cooled to ice at –40ºC?
1. Calculate the heat energy required to heat 200.0 g of water for soup from 10 degree C to boiling point.
2. What amount of heat is needed to heat 50.0 kg of water in a dishwasher from 10 degree C to 70 degree C?
3. You have 2.50 kg of mercury at 22 degree C. You find that it requires 3.20 x 103 J of energy to raise its temperature to 32 degree C. Calculate the specific heat capacity of mercury.
4. To raise the temperature of 400.0 g of gold from 50 degree C to 75 degree C, 1.3 kJ of energy is needed. What is the specific heat capacity of gold?
5. A piece of metal with a mass of 500.0g is put into boiling water until it is the same temperature as the boiling water. It is then transferred very quickly into 200.0g of water, which is 20 degree C. The final temperature of the water and metal is 30 degree C.
a) How many joules of energy did the 200.0 g of water absorb as it was heated?
b) How many joules of energy did the metal release as it cooled?
c) What is the specific heat of the metal?
6. To cool 400. g of a solid having an initial temperature of 85 degree C, you put it into 200.g of water at 15 degree C. If the final temperature of the solid and water is 35 degree C, determine the specific heat capacity of the unknown substance.
7. 3.00 x 104 J of heat energy is added to a 1.00 kg block of aluminum that has an initial temperature of 10 degree C. The specific heat for aluminum is 9.20 x 102 J/kg°C. Calculate the final temperature.
8. An unknown piece of metal that has 0.200 kg mass is heated to 350 degree C. It is quickly placed in 0.250 kg of water at 20 degree C, which is contained in a 225 g aluminum calorimeter. The final temperature of the metal, water, and calorimeter is 38 degree C. What is the specific heat capacity of the unknown metal?
9. A 10.0 kg piece of brass at 71 degree C is placed in 20.0 kg of water that is 10 degree C. What is the final temperature of the brass and water?
Latent Heat Problems
1. Which takes more heat, melting ice or evaporating water?
2. Explain why ice is useful in coolers.
3. How much heat is given off when 3.2 kg of water freeze? Assume the temperature stays constant at 0ºC.
4. How much heat is required to change 2.5 kg of water at 20ºC to steam at 150ºC?
5. How much heat is needed to change 2.0 kg of silver at 20ºC into liquid silver? Silver melts at 961ºC.
6. How much heat is needed to change 0.50kg of ice at –20ºC into steam at 120ºC?
7. How much heat is released when 500g of steam at 250ºC is cooled to ice at –40ºC?
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