I AM DEAD Flashcards
A woman has been smoking heavily for many years. her arteries is blocked with tar. is this true or false
false
10g of potassium chloride is added into a beaker containging 25 ml of water. what happens
enodthermic process
kwashiorkor
protein defiency
a vehicle sinks into soft ground
the vehicle is changed so that it does not sink as far. which change is made?
wider tyres
dispersion
splitting of light
refraction
bending of light
condensation
evaporation
melting
sublimation
which is the change of state is an exothermic process
condensatiion
a rocket is travelling vertically upwards/ air resistance equals:
you use the thrust minus the weight
direction of motion
mass
shape speed
whcih list contains only properties of an object that can be changed by a force
direction of motion
shape
speed
state the effect on the moment of girl’s weight when she moves closer to the pivot
decrease
explain why steam is used to reacct with magnesium
so that the reaction can go more rapidly
in terms of energy that is given out and energy that is put in, what is an exothermic reaction
an exothermic reacction is a reacction that gives out energy that is put in, what is an exothermic reaction
what kind of prodcut is made in the reaction between potassium and water> how would you test for it
alkali. us ph indicator such as litmus paper, universal solvent
describe the pulling force and frictional foce
which force is large than another
after a short time, the suitcase is moving at a constant speed. 2 reasons
size of pulling force equals to the size of frictional force
opposite direction
state what would hhappen to the object when very cold water is ppoured over it
shirnkd
descrbe the movement of particles when very cold water is poured over it
move slower
describe the chnage in gas pressure inside the object and explain your answer
gas pressure decreases as the particles of gas collide with the wall lesss fequentl
describe the atmospheric pressusre outside the objectt
does not change
how does atmospheric outside the object chagnes the object
it compresses it
which colouds of light slows the most when passing through the glass prism
violet
howcould you move the screen to make the colours on the screen dimmer
move the screen further away from the prism
what is a magnetic material
an object or anything that is attracted to a mgnet
what does magnetise mean
given the properties of a magnet
suggest a method to magnetise the iron by using a bar magnet
stroke the iron with the same pole of the magnet in the same direction for several times
describe how the strength of the magnetic field varies when detected along the direction north to south
gets weaker then get stronger
why when the wire is connected to the cell, the pointed end of the nail can be used to pick up paperclips
when current flow through the nail, it is magnetised paperclips are magnetic
how can dylan identifu the poles of electromagnet
place the noerh pole of a bar magnet close to the pointed end of the pole, if it repels ,north, attracts south
why small paperclips would giv e better result as compared to large paperclips
a better range of values can be measured
two advantages of using an adjustable power supply compared to changing number of cells in the circuit
cells might get lowe or run out
easier to adjst the current as compared to connecting or disconnecting the cellls
why is it important that only the plastic coating of the wire make contact with the nail
that current does not flow through the nail and make it a conductor
what would happen to the poles of this electromagnet if the cell in the circuit were reversed so current flowed in the opposite direction. explain your explain
the poles will be reversed as reversing the cell will reverse the current, the magnetic field will be reversed when current flow in oppoiste direction
explain the movement of oxygen from the alveoli to the body cells
- the oxygen in the alveoli diffuse across the walls of the alveoli into the rbc in the blood capillaries
- then, oxygen combines with haemoglobin to form oxyhaemoglobin
- when the oxygen reaches the body cells, oxtgeb us released and diffuse into body cells
define the term electrostatic attraction
the electrostatic attraction between the positive and negative charge on the proton and the negative charge on the electron is what holds individuals atoms together
why a person needs to eat a balanced diet
essential for healthy growth and development of the body
why the food web could not exist without the producers
the prodcues jse energy from the sun to make food by photosynthesis, energy available for all the oother organisms in the foood web
what is ddt and what is used to
ddt is a pesticide use to kill mosquitoes that transmit malaria, and fleas that transmit typhus
list all the elements found in the potassium nitrate
potassium, nitrogen, oxygen
the stength of the magnetic field can be shown by the __________ if the field lines
closeness
besides iron and steel, nname another two materials which would be attracted to the magnet
cabalt and nickel
what causes a wire to produce a magnetic field
electric current flowing throughout
whcih kind of magnet has the same magnetic field as the long coil of wire
bar magnet
what is the proper name for a long coil of wire
solenoid
a bar of magnet is allowed to rotate freely. explain why the north pole of the bar magnet will point towards geographic north
the pole of the earth’s magnetic field close to geo north is a south pole
state the relationship between the direction of the magnetic field lines and the direction that a magnetic compass will point
point along direction of the lines needle points toward geographic north
two changes that would speed up the spreading of the purple colour
increase temperature
use smaller volume of water
describe the anticlockwise moment as the heavier boy moves slowly along the see-saw until he reaches point p
anitclockwise moment becomes larger than the clockwise moment when the heavier boy reacges point P
what causes refraction of light
when light changes speed
what can be ovserved if white light is used to replace red light
spectrum of colours produced
why a red shirt appears red in whit elight
red is reflected by the shirt and all the other colours of light are abosrbed
about 15 minutes, the water had moved up the paper but the drop of liquid had not. why
the liquid is insoluble in water
function of ceramic wool
to soak with water so it prodcues steam when it is heated
why is method not suitable if there is pottasium
highly exothermic, and highly raeactive
