End of year exams Flashcards Preview

Science 7n1 > End of year exams > Flashcards

Flashcards in End of year exams Deck (121):
1

What is the formula for water

H2O

2

What is the chemical formula for carbon dioxide

CO2

3

What is the chemical formula for Hydrochloric acid

HCL

4

What is the chemical formula for methane

CH4

5

What is the chemical formula for Sulphuric acid

H2SO4

6

What is the chemical formula for Iron sulphide

FES

7

What elements are present in water

Hydrogen and oxygen

8

What elements are present in carbon dioxide

Carbon and oxygen

9

What elements are present in hydrochloric acid

Hydrogen and chlorine

10

What elements are present in methane

Carbon and hydrogen

11

What elements are present in sulphuric acid

Hydrogen, sulphur and oxygen

12

What elements are present in iron sulphide

Iron and sulphur

13

What is a molecule?

A molecule is made up of atoms of the same element joined together

14

What is a chemical formula?

A chemical formula shows which elements are present in a substance. It also tells you the number of atoms present in each element.

15

What is an element?

An element is a substance that is only made up of 1 type of atom

16

What is an atom?

An atom is the smallest part of an element that can exist

17

What is the trachea

It has rings of cartilage to keep it open

18

What does the ribcage do?

The bones protect the lung behind it

19

What does the heart do?

It is a muscle so it it is able to pump blood around the body

20

What does the lung do?

It circulates blood into the blood stream

21

What does the bronchus do?

The air travels to go into the blood

22

What does the bronchiole do?

It is a small tube for air to travel in

23

What does the alveolus do?

It diffuses oxygen into the blood

24

What is the correct word for theskull

Cranium

25

The jaw

Manbidle

26

Collar bone

Clavicle

27

The bone in between the ribcage

Sternum

28

The highest bone in the arm

Humerus

29

The small bones protecting the spine

Vertabrae

30

The 2 lowest bones in the arm

Ulna and radius

31

The highest bone in your leg

Femur

32

The knee cap

Patella

33

What bone is where the shin is

Tibia

34

The bone underneath the shin

Fibula

35

What does cartilage do?

It reduces fraction and acts as a shock absorber

36

What does synovial fluid do?

It lubricates the joint

37

What is a joint?

It is a place where 2 or more bones meet

38

What is a ligament

It joins bone to bone stabilising the joint

39

2 types of joints are

Moveable or fixed

40

He

Helium

41

Li

Lithium

42

Be

Beryllium

43

B

Boron

44

C

Carbon

45

N

Nitrogen

46

O

Oxygen

47

F

Fluorine

48

Ne

Neon

49

Na

Sodium

50

Mg

Magnesium

51

Al

Aluminium

52

Si

Silicon

53

P

Phosphorus

54

S

Sulphur

55

Cl

Chlorine

56

Ar

Argon

57

K

Potassium

58

Ca

Calcium

59

Sc

Scandium

60

Ti

Titanium

61

V

Vanadium

62

Cr

Chromium

63

Mn

Maganese

64

Fe

Iron

65

Co

Cobalt

66

Ni

Nickel

67

Cu

Copper

68

Zn

Zinc

69

Ga

Gallium

70

Ge

Germanium

71

As

Arsenic

72

Se

Selenium

73

Br

Bromine

74

What does a cell membrane do?

It controls what comes in and out of a cell it's like a barrier

75

What does a nucleus do?

It controls everything in the cell

76

What does the cytoplasm?

It is a soft substance where the chemical reactions take place.

77

What is the mitochondria?

It is where respiration happens which is one of the most important things

78

What is respiration?

It is where energy is transfered

79

What does the cell wall do?

It provides support it's made of a tough fibre named cellulose, which makes it rigid

80

What does the vacuole do?

This contains cell-sap,which keeps the cell firm

81

What does the chloroplast do?

This is where photosynthesis takes place which traps energy transferred from the sun

82

What is a unicellular organism?

It's a loving thing that is only made up of 1 cell.

83

Give 2 examples of unicellular organisms

Euglena, amoeba or bacteria.

84

What is diffusion?

When particles from an area of high concentration move to an are of low concentration

85

What is friction?

It is a force between 2 surfaces that are in contact

86

What are balanced forces?

When 2 forces acting on an object are equal in size but act in different directions we say that they are balanced

87

What are unbalanced forces?

When 2 forces acting on an object are not equal in size, we say that they are unbalanced forces

88

What is a wave?

It is an oscillation or or vibration that transfers energy

89

What is refraction?

It's when light gets passed from 1 medium into a more dense substance which makes the direction change and make it look very different

90

What is dispersion?

It is the splitting of light

91

What type of wave is a sound wave?

Longitudinal wave

92

What must sound waves pass through to be heard?

A medium (solid, liquid or gas)

93

The higher the amplitude the higher the...

Sound

94

The greater the frequency the higher the...

Pitch

95

The pitch of a sound depends on the...

Frequency

96

Frequency is measured in..

Hertz(Hz)

97

What is the audible human ear range?

20Hz-20,000Hz

98

What is anything above 20,000Hz called for humans?

Ultrasound

99

What are echoes?

They are reflections of sound waves

100

What can they be reflected off.

Objects

101

What surfaces are good at reflecting sounds

Hard or smooth

102

What surfaces are good at absorbing sounds?

Soft or rough

103

What is the method for using echoes to calculate distances?

Total travelled distance by sound= speed of sound(in m/s) x Time taken to hear echo
Distance to object = Total distance travelled by sound divide by 2

104

Magnification

The amount of focus the microscope uses

105

MRS GREN

Movement
Reproduction
Sensitivity
Growth
Respiration
Excretion
Nutrition

106

What is a specialised cell?

It is a cell that is made to do a certain job

107

What is a resolution?

To attempt to fix something whether it be in the organism or anywhere else

108

What is a microscope?

It is a piece of equipment you use to get a closer look on anything especially cells you can look further if you turn up the focus wheel

109

What is an organism?

There are many working cells inside a organism and there are many in our body

110

What are red blood cell adaptions.

The red blood cells transfer oxygen to get rid of carbon dioxide, it gets transported to the lungs for us to exhale

111

What are nerve cell adaptions?

It sends out many mini signals to other parts of the organism to help them function

112

What are root hair cell adaptions?

They speed up osmosis because they have a large surface area.

113

What are egg cell adaptions?

It is supposed to be fertilised by a sperm cell and it has a special egg membrane to make sure it is only fertilised by 1 sperm

114

What is binary fission?

This is where 1 cell splits into 2 cells to reproduce bacteria

115

What medium is oxygen?

Gas

116

What medium is perfume?

Liquid

117

What medium is orange juice?

Liquid

118

What medium is wood?

Solid

119

What medium is helium?

Gas

120

What medium is ice?

Solid

121

What is evaporation?

When some particles turn from liquid to gas below the boiling point of a substance.