九記科學人: F2 Workbook Answers

顯示具有 F2 Workbook Answers 標籤的文章。顯示所有文章

2017年5月23日星期二

Workbook Answers 10.5

Section 10.5

A. Concept checking p.34

False

True

B. Multiple choice p.34

C. Questions p.35

1. (a) Rainwater that has a pH value lower than 5.6.

(b) Sulphur dioxide and nitrogen oxides

(d) Calcium carbonate in limestone reacts with acid rain. Calcium carbonate dissolves and gives off carbon dioxide in the process.

(e) • Making the water in lakes and rivers so acidic that fish and plants cannot survive.

• Making soil too acidic and thus affecting plant growth.

(or other reasonable answers)

2. A small amount of vinegar was left in the bottle. The water she used to water her plants was therefore acidic. As a result, the soil became too acidic for plant growth and the plants died.

Workbook Answers 10.4

Section 10.4

A. Concept checking p.31

False

True

B. Multiple choice p.31

C. Matching p.32

(a) ii

(b) i

(d) iii

D. Question p.33

(a) The gas is not hydrogen.

(b) (i)

(or other reasonable answers)

(ii) The gas is carbon dioxide.

2017年5月6日星期六

Workbook Answers Ch 10.1 - 10.3

Sectional Exercise
Sections 10.1 & 10.2
A. Concept checking p.25
1. True
2. False
3. False
4. True
5. False
6. True

B. Multiple choice p.25
1. B
2. D
3. B
4. C
5. B
6. A
7. A

C. Fill in the blanks p.27
1. sour
2. opposite
3. (a) bitter
(b) soapy / slippery
4. (a) sodium hydroxide
(b) potassium hydroxide
(c) protective gloves / gloves
5. (a) slow running water / the tap
(b) 10

Section 10.3

A. Multiple choice p.27

1. B

2. D

3. C

4. A

5. A

B. Fill in the blanks p.28

1. (a) blue

(b) red

(d) blue

(e) Neutral

2. (a) degree

(b) acidic

(d) alkaline

C. Questions p.29

1. (a) ii

(b) iv, vii

(d) iii

(e) i, viii

2. (a) Its pH value may be 2.5 – 5.

(b) Carbon dioxide is boiled off. There is no / less carbonic acid. The amount of acid in the drink decreases, so the drink becomes less acidic and its pH value increases.

3. (a) Use a piece of pH paper / a pH meter / universal indicator solution to measure its pH value.

(b) Silk Liquid Soap

(d) Silk Liquid Soap has a pH value of 5.5, which is the same as the pH value of healthy skin. It is better for our skin. Soap solution has a pH value of 10, which is significantly higher than the pH value of our skin and may irritate / harm our skin.

Integrated Exercise

A. Concept checking p.45

1. True

2. False

3. True

B. Multiple choice p.45

1. C

2. B

3. B

4. C

C. Questions p.48

1. (a) Solution A: vinegar

Solution B: rainwater

Solution C: soap solution

Solution D: lime water

(b) Its pH value may be between 8.8 and 12.3.

2. (a) Indicators P and T

(b) Indicators Q and R are blue in ammonia.

(d) Indicator P is yellow in ethanoic acid and in sodium hydroxide.

(e) Indicator P is red in a solution with a pH value equal to or less than 2. Indicator T is yellow in a solution with a pH value in between 2 and 8. If a solution looks red after adding indicator P and yellow after adding indicator T, it means that the solution has a pH value of about 2.

2017年3月27日星期一

Ch 9 Workbook Answers

2017年1月11日星期三

Workbook Answers Chapter 8

Section 8.1 (P.51)

A. Concept checking

1. False

2. True

3. False

4. True

5. True

B. Multiple choice

1. (a) electrical conductors

(b) electrical insulators

2. (a) closed

(b) open

C. Question

1. (a) electrical insulator

(b) electrical conductor

(d) electrical conductor

(e) electrical insulator

(f) electrical insulator

(g) electrical insulator

(h) electrical conductor

(i) electrical conductor

3. (a) (i) will not

(ii) do not form

(b) (i) will

(ii) form a closed circuit

(ii) the bulb, the dry cells and the wires form a closed circuit

(d) (i) will not

(ii) electrical energy in the circuit

4. No. The wheels of the tram are connected with the power supply through the rails, and the circuit is complete. (or other reasonable answers)

Section 8.2 & 8.3 (P.54)

A. Multiple choice

1. (a) ampere

(b) volt

2. free electrons

3. 1.5

4. (a) ammeter

(b) voltmeter

5. larger

B. Question

1. (a) dry cell

(b) wire

Section 8.5
A. Multiple choice p.60-61
1. D
2. C
3. B
4. C

B. Question p.61-62
1.
(a) dry cell
(b) battery
(c) bulb
(d) ammeter
(e) voltmeter
(f) resistor
(g) rheostat
(h) switch

Integrated Exercise
A. Concept checking p.79
1. False
2. True
3. False
4. False
5. True
6. True

B. Multiple choice p.80-83

1. B

2. D

3. B

4. C

5. B

6. D

7. D

8. C

9. B

Quick Review
1. Electric current, voltage and resistance p.90
(a) open
(b) closed
(c) voltage
(d) larger
(e) resistance
(f) smaller
(g) current
(h) brighter

2. Ammeter, rheostat and fuse p.90
(a) rheostat
(b) resistance
(g) (electric) current
(h) black
(i) positive

2016年12月8日星期四

Workbook Answers 7.6

Section 7.6
A. Multiple choice p.23-24
E 1. D
E 2. D
E 3. D
E 4. C

B. Fill in the blanks p.25
E (a) contract
(b) upwards
(c) outwards
(d) downwards
(e) increases
(f) decreases
(g) relax
(h) inwards
(i) downwards
(j) upwards
(k) decreases
(l) increases

C. Matching p.25
E (a) v
(b) i
(c) ii
(d) vi
(e) iii
(f) iv

2015年6月14日星期日

F2 Workbook Ch11 Quick Review

A. Sensing the environment p.97

(a) stimuli

(b) receptors

(d) senses

(e) responses

B. Our senses p.97

(b) (i) sound receptors

(ii) cochlea

(ii) nose

(d) (i) taste receptors

(ii) taste bud

(e) skin

C. p.98

F2 Workbook Ch11 Integrated Exercise Answers

A. Multiple choice p.84

1. D

2. C

3. D

4. B

5. C

6. A

7. D

8. C

B. Fill in the blanks p.90

1. (a) sight

(b) light receptors

(d) optic nerve

(e) blind spot

C. Questions p.91

1. (a) Stimulus/stimuli: Temperature of water

Sense organ(s): Skin

Sense(s): Heat and cold

(b) Stimulus/stimuli: Chemicals / citric acid / lemon juice in the drink

Sense organ(s): Tongue

Sense(s): Taste

Sense organ(s): Nose

Sense(s): Smell

(d) Stimulus/stimuli: Light and sound / thunder and lightning

Sense organ(s): Eyes and ears

Sense(s): Sight and hearing

2. (a) P : lens; Q : cornea; R : iris; S : optic nerve

(b) (i) P , Q and T

(ii) This allows light to pass through.

(d) (i) This point is called the blind spot.

(ii) No, we cannot see the object. The reason is that there are no light receptors on the blind spot, no signals are produced when the light from an object is focused on it.

3. (a) (i) The lens

(ii) The retina

(b) (i) Short sight

(ii) A person with short sight can see near objects but not distant objects clearly.

(iii) The lens is thicker than normal or the eyeball is too long.

(c)

(or other reasonable answers)

F2 Workbook 11.3, 11.4 Answers

Section 11.3

A. Concept checking p.67

1. True

2. False

3. False

4. False

5. True

B. Matching p.67

(a) Telescope; i, iv

(b) Binoculars; i

(d) Light microscope; iii

Section 11.4

A. Multiple choice p.68

1. B

2. D

3. A

4. A

5. D

B. Fill in the blanks p.70

(a) (i) near

(ii) thin

(iii) short

(iv) convex

(b) (i) certain colours

(ii) cones

(ii) artificial lens

(d) (i) distant

(ii) thick

(iii) long

(iv) concave

C. Questions p.70

1. (a) (i) Diagram I

(ii) Diagram II

(b)

(ii) Yes, he needs a suitable convex lens.

(iii)

(or other reasonable answers)

F2 Workbook 11.2 Answers

Section 11.2

A. Concept checking p.62

1. False

2. True

3. False

4. False

5. False

B. Multiple choice p.63

1. C

2. A

3. D

4. D

C. Matching p.64

(a) i, iv

(b) ii, iii

(d) i, iii

D. Questions p.65

1. (a) A : cornea B : iris

D : pupil E : lens

G : retina H : yellow spot

I : blind spot J : optic nerve

(b) (i) A, C , E and F

(ii) G

(iii) E

2. (a) R

(b) Q

3. (a) retina

(b)

; inverted

F2 Workbook 11.1 Answers

Section 11.1

A. Concept checking p.61

1. False

2. True

3. True

4. False

5. True

B. Questions p.62

(a)	(b)	(c)	(d)	(e)	(f)
sight	hearing	heat	smell	taste	touch
eyes	ears	skin	nose	tongue	skin

2. (a) Eyes, tongue or nose

(b) Nose or skin

(d) Skin

(e) Ears

(f) Nose or tongue

訂閱：文章 (Atom)

2017年5月23日 星期二

2017年5月6日 星期六

2017年3月27日 星期一

2017年1月11日 星期三

2016年12月8日 星期四

2015年6月14日 星期日

2017年5月23日星期二

2017年5月6日星期六

2017年3月27日星期一

2017年1月11日星期三

2016年12月8日星期四

2015年6月14日星期日