Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

science- sec 3 > Energy > Flashcards

Energy Flashcards

You may prefer our related Brainscape-certified flashcards:
Biology 101 flashcards
1
Q

What is energy?

A

The capacity to do work or to produce change

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How is energy expressed?

A

Joules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

1N=?

A

100g

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Joules=

A

Newtons x meters

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is thermal energy?

A

Energy that comes from the random motion of the particles that make up a substance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is temperature?

A

Degree of agitation in a substances atoms and molecules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What factors can affect thermal energy?

A

Temperature and amount of particles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What happens when there is a higher temperature?

A

Particles move faster, higher thermal energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What happens when there are more particles in a substance

A

More collisions, more thermal energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is radiant energy?

A

The kind of energy that is contained in and transported by electromagnetic waves

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is wavelength

A

The distance form crest to crest

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What does the amount of energy depend on?

A

Wavelength and radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Chemical energy

A

Energy stored in the bonds of a molecule

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What does the amount of energy depend on?

A

Strength of a bond

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What happens when there is a stronger bond?

A

More energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is mechanical energy?

A

Energy that results from the speed of an object, its mass and its surroundings

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What happens with speed?

A

Energy increases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What happens with more mass

A

Greater the mechanical energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

More mass

A

More energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is Energy transformation ?

A

Changing of energy from one form to another

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What is an example of energy transformation?

A

When a log burns some of the chemical energy stored in the wood is transformed into radiant energy and thermal energy

22
Q

Is a lamp an energy transformation or transfer? What does it change to ?

A

Energy transformation

Electrical - thermal + radiant

23
Q

Other examples of energy transformations

A

Photosynthesis -radiant to chemical

Windmill - mechanical to mechanical

24
Q

What is an energy transfer?

A

Movement of energy form one place to another

25
Q

Examples of energy transfer

A

Heat = transfer of thermal energy ex: burning log - heat the room

26
Q

Heat

A

A transfer of thermal energy between two places with different temps
Heat travels from places with high temp to low

27
Q

What is a physical change?

A

A phish also change does not effect the nature or the characteristic properties of matter

28
Q

What are Changes of state ?

A

Transformation from one state to another

29
Q

What happens in a change of state?

A

The forces of attraction change but the particles don’t.

30
Q

What happens when we heat water?

A

Thermal energy is transferred from heating element to after. The liquid particles are sped up enough until they have absorbed enough energy to go from liquid to gas
Energy is absorbed

31
Q

What happens when we freeze water?

A

Heat transfers from an area of hot towards cold
Water transfers it’s heat to the cold freezer, lowering the waters temp
Energy is given off

32
Q

What is dissolution?

A

The creation of a solution by a solute in a solvent

33
Q

What happens when sugar dissolves in water?

A

Sugar molecules break apart until they are spread out in the water.
Sugar and water don’t change.
The forces of attraction change

34
Q

What is exothermic?

A

Reactions that release energy, increasing the energy level of their environment. This may be noticeable by an increase in temp or emission of light

35
Q

What is endothermic?

A

Reactions that by absorbing energy, lower the energy level of the medium. This can be perceptible by a drop in temperature

36
Q

What is deformation?

A

Changing the shape of a material with an energy transfer (reversible or permanent)

37
Q

What is an example of a deformation?

A

Mechanical from a jumper causes the reversible deformation of a trampoline (mechanical into elastic energy)

Smashing a calculator (permanent)

38
Q

What is a chemical change?

A

Changes the nature and characteristic properties of matter. It produces one or more new substances. Bonds between the atoms are changed to create new products

39
Q

Law of conservation of mass

A

Nothing is lost, nothing is created, all is transformed

40
Q

How are chemical reactions represented

A

In equations

Reactant —> product

41
Q

Clues to see if a chemical reaction has occurred

A 
Release of gas
Greater change of heat 
Generation of light 
Change of colour
Formation of precipitate
42
Q

What is synthesis?

A

Formation of a complex molecule from atoms or simpler molecules

43
Q

Example of synthesis

A

2H2+ o2 —> 2H2O +energy
Synthesis of water (releases energy)

N2 +2O2 +energy —> 2NO2
Nitrogen dioxide synthesis (absorbs energy)

44
Q

Decomposition

A

Transformation of complex molecules into simpler molecules or into atoms

45
Q

Example of decomposition

A

2H2O +electrical energy —> 2H2+O2

Electrolysis of water

46
Q

What happens by the end of decomposition?

A

The chemical energy that was stored in the bonds of the molecule is released and transformed into other forms of energy

47
Q

What is oxidation ?

A

Chemical reaction involved mg oxygen or a substance that has similar properties (sulfate, chlorine, Fluoride,)

48
Q

Example of oxidation

A

4Fe +3O2 —> 2Fe2O3 + energy

Rust

49
Q

Precipitation

A

Formation of a solid that I sleds soluble, or not soluble, following the mixing of two solutions

50
Q

Example of precipitation

A

NaCl +AgNO3 _> NaNo3 + AgCl

51
Q

Led nitrate with potassium iodide

A

KL +Pb (NO3)2 —> KNO3 + Pbl2

science- sec 3 (7 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions