Science CWE Flashcards
(102 cards)
1
Q
what is a state of matter ?
A
the tree form at which a substance can exist.
2
Q
what is evaporation ?
A
the process by which a substance turns into gass.
3
Q
what is condensation ?
A
the process at which a gas turns into a liquid.
4
Q
what is a particle ?
A
the smallest unit of matter.
5
Q
what is expansion ?
A
when a substance increases in size.
6
Q
what is contraction ?
A
when a substance decreases in size.
7
Q
what is diffusion ?
A
when particles of one substance moved from a area of high concentration to an area of low concentration.
8
Q
what is pressure ?
A
the force exerted when particles of a gas collide with the walls of their container.
9
Q
what is density ?
A
how the mass of an object is related to its volume.
10
Q
do solids have a definite volume ?
A
yes
11
Q
do liquids have a definite volume ?
A
yes
12
Q
do gases have a definite volume ?
A
no
13
Q
can you compress a solid ?
A
no
14
Q
do gases flow ?
A
yes
15
Q
can you compress a liquid ?
A
yes, but it is difficult.
16
Q
can you compress a gas ?
A
no
17
Q
properties of solids ?
A
lined in rows
vibrating
touching
force between particles are strong
18
Q
properties of liquids ?
A
touching
not neat rows
the forces are weaker
19
Q
properties of gases ?
A
lots of energy
not touching
randome/ every were
20
Q
what is a solid to a gas ?
A
sublimation.
21
Q
what is a gas to a solid ?
A
deposition.
22
Q
what is sublimation ?
A
solid to gas.
23
Q
what is deposition ?
A
gas to solid.
24
Q
what is equilibrium ?
A
state of an object when opposing forces are balanced.
25
what is deformation
changing shape due to a form.
26
be amazing
you already are :)
27
what is newton ?
unit for measuring forces.
28
what is a resultant force
single force which can replace all the forces acting on a object and have the same affect.
29
what is friction
force opposing motion which is caused by the interaction of surfaces by moving over one another. drag.
30
what is tension ?
force extending or pulling apart.
31
what is a contact force ?
a force that affects an object by direct force.
32
what is a non-contact force ?
a force that affects an object from a distance, not touching.
33
name some contact forces.
push, pull and kick
34
name some non-contact forces.
gravitational, magnetic, friction, weight.
35
name all forces ?
thrust
friction
reaction to surface
air resistance
water resistance
upthrust
weight
tension
36
how many forces are there ?
8
37
what is thrust ?
a forward push on an object (car moving)
38
what force is a forward push on an object ?
thrust.
39
what is reaction to surface ?
when weight is on a solid object (book on table)
40
what is the force that stops force between two objects ?
friction.
41
what is the force that weight is on a solid object ?
reaction to surface.
42
what is air resistance or drag ?
stopping force when object is in air.
43
what force stops force when an object is in air ?
air resistance or drag.
44
what is water resistance ?
stopping force when object is traveling through water.
45
what force stops a force when traveling through water ?
water resistance.
46
what is what is up thrust ?
occurs when weight is on liquid.
47
what force occurs when weight is on liquid ?
water resistance.
48
what is weight ?
force associated with mass a gravity.
49
what force is associated with mass and gravity ?
weight.
50
what are the five rules of drawing a force diagrams ?
1- use pencil and ruler
2- draw object as a square boxes or circle
3- label your forces
4- arrows drawn away from box not into box
5- the longer the arrow the bigger the force (N) newtons
51
True/ False/ Partially True
friction always slow things down ?
partially true.
52
True/ False/ partially true
cars need friction to stop ?
true
53
draw a diagram of a floating duck
up thrust
shape
weight
54
what is an element ?
a substance made of one type of atom.
55
what is an atom ?
the smallest unit in which matter can be divided.
56
What is a molecule ?
a group of two or more atoms joined together.
57
What is matter ?
a substance that has mass of volume.
58
what is a compound ?
a substance made up of mare than one type of atom chemically combined
59
what is a mixture ?
made up of different substances that are not chemically joined together.
59
what is a chemical formula ?
shows the number and type of atoms in a substance.
60
what is a diatomic element ?
two atoms of the same element chemically bonded together.
61
what is Au ?
gold
62
what is C ?
carbon
63
are compounds pure ?
yes
64
what is pure ?
something made up of only one type of substance- atom, molecule, compound
65
are mixtures pure ?
no
66
what is the difference between elements and compounds ?
an element is a pure substance but a compound is multiple elements chemically bonded together.
67
what elements make up the sugar glucose ?
carbon, hydrogen and oxygen.
68
what is mono ?
one.
69
what is di ?
two.
70
what is Li20 ?
lithium oxide.
71
what is MgO ?
magnesium oxide.
72
what is So4 ?
sulfate.
73
ok
fantasice
74
what are the group and valencies?
g- 1 2 3 4 5 6 7 8
v- 1 2 3 4 3 2 1 0
75
what is property ?
characteristics or trait used to describe matter by observation/ measurement or both.
75
what Ca Cl in valencies and group ?
CaCl2
76
what is a periodic ?
trends in properties of elements in the periodic table that occur in regular intervals.
77
what is a group ?
a column.
78
what is conductivity ?
how well a material allows heat or electricity to pass through.
79
what is a period ?
a row.
80
what is a melting point ?
the temperature at which a solid tuns to liquid.
81
what is a boiling point
the temperature at which a liquid turns to gas.
82
what is ductile ?
able to be drawn into a thin wire.
83
what is malleable ?
can be hammered, pressed into shape without breaking or cracking.
84
has the periodic table changed in the last 200 years ?
yes
85
who helped adapt the periodic table ?
Dimitri mendeleev
86
what is lustrous mean ?
shiny when polished.
87
what is shiny when polished ?
lustrous.
88
what does sonorous mean ?
ring when struck.
89
what rings when struck ?
sonorous.
90
what does each box in the periodic table represent ?
an element.
91
how did dmitri mendeleev arrange his periodic table ?
left gaps for undiscovered elements
organised by atomic weight number
grouped elements with similar radioactivity
92
by what number are the modern elements in the periodic table arranged to ?
atomic number.
93
name the block in the middle of the periodic table that contains many usfeul metals ?
transition metals.
94
describe the pattern of radioactivity in group 1 ?
more reactive as you go down.
95
what happens to the melting point as you go down group 1 ?
it gets lower.
96
what happens to the boiling point as you go down group 1 ?
it gets lower.
97
what is group 0 called ?
the noble gasses.
98
what is group 1 called ?
the alkali metals.
99
what is group 7 called ?
the halogens.
100
name 3 metals and their uses and what properties they have to help them with their uses ?
silver- jewellery/ un-reactive
copper- water pipes/ good conductor
iron- car bodies/ strong
titanium- hip replacement/ un-reactive
aluminium- foil/ low density
