Science

Question 1

What is diffusion?

Answer 1

The net movement of particles from a region of higher concentration to a region of lower concentration.

Question 2

What is osmosis?

Answer 2

The net movement of water molecules from a region of higher water potential to a region of lower water potential THROUGH A PARTIALLY PERMEABLE MEMBRANE.

Question 3

What is a partially permeable membrane?

Answer 3

A membrane that only allows some substances to pass through (such as cell membrane)

Question 4

Function of Cell Wall

Answer 4

Give plant a regular shape, protect cell from external damage

Question 5

Function of Cell membrane

Answer 5

Control movement of substances in and out of the cell

Question 6

Function of Nucleus

Answer 6

Contains genetic information which is essential for cell division. And it controls all activities within the cell

Question 7

Function of Cytoplasm

Answer 7

Acts as a medium for all cell activities to take place.

Question 8

Function of Chloroplast

Answer 8

Make food for the cell through photosynthesis

Question 9

Function of Vacuole

Answer 9

Stores substances in the cell such as water

Question 10

What happens to images reflected by a convex mirror?

Answer 10

They become laterally inverted and are magnified

Question 11

How to separate salt that is dissolved in saltwater?

Answer 11

Evaporation to dryness

Question 12

How to separate sand from water?

Answer 12

Filtration

Question 13

How to separate pure water from saltwater

Answer 13

Distillation

Question 14

How to separate iron and sand?

Answer 14

Magnetic attraction

Question 15

What is an element

Answer 15

Elements are the basic building blocks of matter and cannot be broken down into simpler substances

Question 16

What is a compound?

Answer 16

Two or more elements that are chemically combined

Question 17

What is a mixture?

Answer 17

Two or more elements/compounds that are not chemically combined

Question 18

Arrangement of particles in a liquid

Answer 18

Closely packed but in a disorderly manner

Question 19

Movement of particles in a solid

Answer 19

Vibrate about fixed positions

Question 20

Arrangement of particles in a gas

Answer 20

Very far apart and arranged randomly

Question 21

Movement of particles in a gas

Answer 21

Move very quickly in random directions

Question 22

Arrangement of particles in a solid

Answer 22

Very closely packed in an orderly manner

Question 23

Movement of particles in a liquid

Answer 23

Slide past one another

Question 24

Why are gas able to be compressed?

Answer 24

They have large space in between the gas particles

Question 25

What is the charge of a proton?

Answer 25

+1

Question 26

What is the charge of a neutron?

Answer 26

0

Question 27

What is the charge of an electron?

Answer 27

-1

Question 28

Why is an atom neutrally charged?

Answer 28

Because they have an equal number of protons and electrons. Positive charge of protons cancel out negative charge of electrons.

Question 29

Colour of a non-luminous flame?

Answer 29

blue

Question 30

Colour of a luminous flame?

Answer 30

orange

Question 31

Electrical and Heat Conductivity:
Ceramic (is it a good or poor conductor)

Answer 31

poor conductor

Question 32

Electrical and Heat Conductivity:
Metal

Answer 32

good conductor

Question 33

Electrical and Heat Conductivity:
Plastic

Answer 33

poor conductor

Question 34

Electrical and Heat Conductivity:
Wood

Answer 34

poor conductor

Question 35

How Noob is Saba?

Answer 35

He is the noobest