Models
Substance A melts at 5oC and boils at 150oC. State at room temperature
liquid
A chemical effect of electricity is
Electroplating jewellery
An acid reacts with an alkali to form
salt and water
Purpose of a fuse
Prevent a user from getting electric shock
Function of a red blood cell
Carry oxygen to different parts of the body
charges on an electron, a neutron and a proton
-1, neutral, +1
two examples of non-contact forces
Gravitational and magnetic force
example of oxidation
rusting
respiration
Current is
amount of electric charge flowing
The organ secrete lipase
Small intestine
An inflated balloon will shrink if placed in a refrigerator
kinetic energy of the gas molecules in a balloon decreases when the temperature decreases. This makes the molecules move more slowly and have less frequent and weaker collisions with the inside wall of the balloon, which causes the balloon to shrink a little.
There is work done when box is ______.
pushed and moves forward, up the slope.
lifted vertically from the floor
test for carbon dioxide gas
Bubble into limewater, white precipitate is formed
example of magnetic effect of an electric current
MRI, electromagnet
fertile period during menstrual cycle
Day 10-15
A small block of iron cannot be compressed easily
The particles of iron piece are closely packed and have negligible intermolecular space
Factor affecting the rate of conduction
Type of material
2 examples of neutralization
antacids
brushing teeth with toothpaste
adding calcium oxide to acidic soil
Give one structural adaptation of pangolin in rainforest
scales for protection
long sticky tongue for catching ants and termites
strong front legs and claws for digging
Long term effects of syphilis
Blindness
paralysis
major brain heart damage
infertility
give examples of diffusion solid in solid
diffusion of chalk particles into the blackboard.
3 Factors affecting rate of radiation
Temperature
Surface Area
texture of surface
Colour of surface
Explain the acidification of oceans
release of large amount of carbon dioxide due to combustion and dissolve in sea water
Give one structural adaptation of kacang putih moth in mangrove swamp
brown colour matches that of trees
2 benefits of bacteria
produce certain enzymes, vitamins, amino acids
food items produced by bacteria