NATURAL SCIENCE ANSWERS

💡🔋🔍In this post you'll find all the answers for Natural Science unit 5💡🔋🔍

------------------UNIT 6---------------------

SEMANA 8 AL 12 DE JUNIO

PÁGINA 120

ACTIVIDAD 1

Suggested answers:

a) Most of the food we eat nowdays has been prepared in large factories.

b) Synthetic materials, such as nylon and viscose are often used to make clothes.

c) The first means of transport were the horse and carriage, the bicycle and the steam train.

d) Nowdays we use cars, planes, trains and ships to travel from place to place.

e) Computers follow four basic steps: input, processing, storage and output.

f) To connect to the Internet, we need a computer, a router, a web browser and an ISP.

g) Word processing programs are useful because they help us save time when writing a document.

PÁGINA 116

ACTIVIDAD 1

a) A typewriter and a printing press.

b) Numbering or adding bullet points.



SEMANA 25 AL 29 DE MAYO

PÁGINA 110 

ACTIVIDAD 1

a) Computers use binary code.
b) Programmers write software.

SEMANA 18 AL 22 DE MAYO

PÁGINA 105 

ACTIVIDAD 2

Suggested answers:

a) Desktop computer because it isn´t a portable device.
b) Alarm clock because it´s not a kitchen appliance.
c) Lorry because it doesn´t transport people.
d) Television because it isn´t related to music.

PÁGINA 106 

ACTIVIDAD 1
a) Food is mass produced, improved transport means we have more variety, food lasts longer because we can preserve it better.
b) Synthetic fabrics are longer-lasting and cheaper to produce.
c) It is easier to detect some illnesses and we can detect them earlier which means they are easier to treat.
d) Travelling long distances is easier, quicker and cheaper than in the past.
e) We find out about news from around the world quickly and have improved access to information.

PÁGINA 107

ACTIVIDAD 2 

Clothing: nylon, velcro.
Healthcare: microscope, X-ray machineZ
Transport: hovercraft, bicycle.

-------------UNITS 4 AND 5---------------

UNITS 4 and 5 - PRESENTATIONS 

Os dejo dos links con presentaciones (resumidas) de ambos temas.

Os pueden ayudar en el estudio junto con los esquemas y ejercicios. 

  🙇¿Cómo descargarlo? Pinchando o copiando los siguientes enlaces:

UNIT 4: https://drive.google.com/open?id=1cH9IqzMeEfpibNEJalGjXgjY0BZ1s19n

UNIT 5: https://drive.google.com/open?id=1676MPB-K3OMdECDvvjZX7_bD5p0JyWRr

REVIEWS UNITS 4 AND 5 (WORKSHEETS) - ANSWERS

PAGE 101  - ACTIVITY 6

a) The north pole of a permanent magnet attracts the south pole of another permanent magnet. 
b) Opposite poles attract whereas alike poles repel. 
c) The magnetosphere is the magnetic field around the Earth. 
d) The magnetosphere protects us from harmful solar radiation. 
e) Magnets attract magnetic materials, for example iron or steel

PAGE 100  - ACTIVITY 1
a) False: The connection between electricity and magnetism was discovered by Oersted.
b) True
c) False: Electromagnets can be switched off.
d) False: The north poles of two bar magnets repel each other.
e) True
f) True

PAGE 95- ACTIVITY 5

 PAGE 86   ACTIVITY  1

a) The protons have a positive charge   /   The electrons have a negative charge.

b) Electrons are the ones that move to create electric current. They move away from their orbits and as results electric current is created.  (as you can see in the picture - page 86)

PAGE 87   ACTIVITY 2

a) 2

b) 4

c) 1

d) 3

PAGE 88   ACTIVITY 1

a) The electrons.

b) It is an invisible forcé produced by the movement of the electrons.

c) Iron, steel,cobalt and nickel.

PAGE 89  ACTIVITY 2

a) Bar magnets can´t be switched on and off.

b) Iron filings can be used to show magnetic fields.

c) A diagram of a magnetic field has lines and arrows to show the direction of the field.

d) When two magnets attract each other, the lines go from one magnet to the other.

e) In a magnetic substance, the electrons orbit the nucleus in a specific direction.

f) We can identify a magnet by testing to see if it repels another magnet.

ACTIVITY 1  -  PAGE 90  

a) Because its core is made of liquid iron.

b) The South pole is the north pole of the magnetosphere,

c) Harmful radiation from the Sun would reach the earth´s surface.

ACTIVITY 2  - PAGE 93

a) Oersted discovered that electricity and magnetism are connected.

b)  He noticed that an electric current affects a compass needle.

c)  Ampere discovered the particle that is now called the electron.

d)  Faraday invented a simple electromagnetic motor.

e)  A moving magnet can produce electricity with a turbine.