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sCIGEGOE Flashcards

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1
Q

Which substance is added to water to make it a better conductor of electricity?

A

Salt

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2
Q

Does pure water conduct electricity?

A

No

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3
Q

What type of water is more likely to conduct electricity?

A

Saltwater

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4
Q

Why does distilled water usually not conduct electricity well?

A

It lacks ions

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5
Q

What is the main factor that influences water’s ability to conduct electricity?

A

Temperature

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6
Q

Something electricity can’t move through is called a(n) ______.

A

insulator

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7
Q

Why are metals useful for making electrical wire?

A

Metals are conductors.

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8
Q

What are Conductors?

A

A conductor is a material that allows electric charge to move through it as an electric current.

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9
Q

Which is NOT an insulator.

A

Copper

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10
Q

What is an example of a conductor?

A
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11
Q

How does friction contribute to heat production?

A

By transferring kinetic energy

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11
Q

How do engineers minimize drag in vehicle design?

A

b. By using streamlined shapes

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12
Q

What is drag?

A

type of friction

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13
Q

What is friction?

A

A force between two surfaces in motion or attempting motion

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14
Q

What effect does air resistance have on falling objects like feathers or parachutes?

A

Slows down their fall

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15
Q

In which direction does friction act?

A

Opposite to the object’s motion

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16
Q

What effect does friction have on a moving object?

A

Slows it down

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17
Q

Which statement about air resistance is correct?

A

Air resistance opposes the motion of objects through the air.

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18
Q

What does air resistance depend on?

A

The object’s shape and size

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19
Q

Which of the following is a harmful effect of friction?

A

Increased wear and tear

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20
Q

What determines the amount of friction between two surfaces?

A

The roughness of the surfaces

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21
Q

How does friction affect speed?

A

more friction decreases speed

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22
Q

In what activities does drag play a crucial role?

A

Swimming

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23
Q

How does the size of an object affect air resistance?

A

Larger objects face more air resistance.

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24
Which force is responsible for making it harder to go faster when riding a bike or running?
Air resistance
25
Air Resistance
Contact Force
26
What force holds the planets in motion around the sun?
Gravitational
27
What is the fundamental difference between mass and weight?
Mass is the amount of matter; weight is the pull of gravity on it.
27
What force would prevent you from pushing a heavy box across the floor?
friction
28
Which of the following is a force acting on an object due to gravity?
Weight
29
Which of the following units is a measure of mass?
Kilogram (kg)
30
How does mass change with location in the universe?
Mass remains constant regardless of location.
31
Which of the following units is a measure of weight?
Newton (N))
32
This involves using a strainer or a big screen to separate the components of solid mixtures.
sieving
33
What method of separation would work best to separate water and salt?
evaporation
34
Stirring causes the particles of the solute to spread out into the spaces between the particles of the solvent ____________________.
faster
35
What's the best to define a homogeneous mixtures?
We can not distinguish their components at first sight
36
There are two types of mixture
Heterogeneous and homogeneous
37
The sugar cubes are called the
solute
37
This method is a technique used in separating a less-dense substance from a denser one.
decantation
38
Which of of these mixtures could be separated by filtration?
sand and water
39
CAN CHALK POWDER BE SEPERATED FROM FLOUR?
NO, BECAUSE FLOUR AND CHALK POWDER DO NOT DIFFER IN SIZE AND COLOUR
40
What combination would dissolve a solid solute the fastest?
high temperature, stirring
41
If I dissolve sugar in water, what is the solute?
Sugar
42
I am a substance in the mixture that you can see it is float or sink. Who am I?
Insoluble substance
43
A dilute solution would be ..................
have small amount of solute
44
If I dissolve carbon dioxide in water (eg soft drink), what is the solvent?
Water
44
The generally solutes dissolve _________ in cold water.
slower
44
THRESHING IS USED TO SEPERATE
GRAINS FROM STALKS
44
What method of separation would work best to separate water and rubber pellets?
filtration
45
The water is called the
solvent
45
FIND THE METHOD OF SEPERATION. (PICKING UNWANTED STONES FROM RICE)
HAND-PICKING
46
A solution is made when one substance _________ in another.
dissolves
47
The Earth's atmosphere is a ____________________ mixture.
Homogeneous
48
Oil in water
Insoluble
48
The substance being dissolved is called the _____________.
solute
49
Which is an example of a solution?
Salt and water
50
What is a solvent?
The substance that does the dissolving in a solution.
51
Is a solution a HOMOGENEOUS mixture or a HETEROGENEOUS mixture?
Homogeneous mixture
52
Is a mixture where you can see the separate parts HOMOGENEOUS or HETEROGENEOUS'
Heterogeneous
53
Is FILTRATION used to separate a liquid from a solution or an insoluble solid from a mixture?
An insoluble solid from a mixture.
54
Stirring a solution makes solid dissolve faster.
True
55
Which one is a separation method?
Distillation, evaporation and filtration.

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