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1. ÁNGEL AYUSO-MORALES MOYA
5º PRIMARIA
MAESTRO JUAN DE ÁVILA
NATURAL SCIENCE UNIT 7

2. ATOMS-> Matter is made out of tiny particles called
atoms
MOLECULES-> Some atoms join together to make
groups know as molecules.

3.  COLORS
 ODOUR
 TASTE
 VOLUME: Describes how much space matter occupies. We
measure volume in milliliters (ml)
1000 milliliters = 1 litre
 MASS: Is the amount of matter in an object. We measure
mass in grams (g)
1000 grams = 1 kilogram

4.  THERMAL CONDUCTIVITY-> Is the ability of certain
substances to conduct o transfer heat. Metals, such as iron or
copper, are good heat conductors, while materials such as
wool, wood, paper, plastic or glass are good heat insulators.
 DENSITY-> Is the amount of matter in a volume. We
measure density in kilograms per litre (kg/l)
Density = mass/volume

5.  HARDNESS-> Is the scratch-resistance of a solid. Diamonds
are the hardest natural solids.
 SOLUBILITY-> Is the ability of a substance to dissolve in
other substance and form a solution. Sugar dissolves well in
water, whereas oil does not.

6.  PURE SUBSTANCES-> Consist of only one type of
matter. Such as table salt or silver

7. MIXTURES (made up two or more pure substances)
HETEROGENEOUS
MIXTURE:
(You can see the individual
substances. Such as sand or a
salad).
HOMOGENEOUS MIXTURE
(You cannot see the individual
substances. Such as the air we
breathe or sea water).

9.  FILTRATION-> Using a filter. When we pour the juice
of a lemon through a filter, the solids stay in the filter,
and the liquid passes through it.

10.  EVAPORATION-> Heating. When we heat a mixture
of salt and water, the liquid evaporates and leaves only
the solids which crystallise and form salt crystals.

11.  SIEVING-> Using sieve. We use sieve to separate solids
of different sizes, such as pebbles from sand.

12.  FORCE-> Is a push or pull that acts on an object.
 Can make things: *move
*stop
*speed up
*slow down
*change direction

13. TYPES OF
FORCES
NON-CONTACT
FORCES
(act through
physical contact)
CONTACT FORCES
(They act through
physical contact)

14.  CONTACT FORCES (They act through physical contact)
 -FRICTION-> Force when two objects rub against
each other. Its acts in the opposite direction of the
movement. E.g. Air (parachute)
Water (kayak or boat)
 - BUOYANCY-> is the ability of objects to float. It is
upward force acting in the opposite direction to gravity.

15.  NON-CONTACT FORCES (act through physical contact)
 -MAGNETISM: Is a force of attraction or repulsion
(magnets attract metal and make compasses work)
 - GRAVITY: Is a force which attracts all objects towards
each other. Planets have a stronger gravitational force.
Astronauts float because in space there is no gravity.

16. STATES OF MATTER