chem
whats mass??
- has mass and occupies space
- has three states ; solid, liquid and gas
- can change through heating and cooling
whats the meaning of freezing point?
a constant temperature when a substance changes from liquid state to become solid at a specific pressure
cooling graph
why is there a lost of kinetic energy?
because heat energy is being released at the same time
nucleon number of potassium is 39. it has 19 protons. how many neutrons and electron does it have?
number of neutrons : 39-19 = 20
number of electrons = number of protons
19
what type of isotope would you use to kill cancer cells during radiotherapy
cobalt-60
how does solid change to liquid?
e.g ice cream that is left in room temperature will absorb the heat and it will change from solid to liquid
what can replace naphthalene?
what are the charges for proton, electron and neutron?
proton is positive charge, electron is a negative charge and neutron is a neutral charge
whats electron arrangement? where is the valence shell?
electron arrangement shows the nucleus in the middle and the number of electrons on the surrounding shells
valence shells are the outermost shells of the electron arrangement
whats the function of phosporus-32
study of plant metabolism, agriculture
whats the kinetic energy of particles and attraction force for liquid?
the kinetic energy is higher than solid. the attraction force is strong but less stronger than solid
whats the fixed room temperature?
25C
whats a nucleon number?
nucleon number consists of proton numbers and neutron numbers
whats the valence for oxygen? (proton number 8)
6
what are the particle arrangement for gas?
particles are far apart due to no attraction force
heating graph
why is there no increase of temperature when solid state is changing to liquid?
heat energy is being absorbed by particles to overcome the attraction force between the particles until solid changes to liquid
the amount of protons equal to??
electrons
they have different nucleon numbers but the same number of protons. what are they called?
isotopes boo
whats the meaning of melting point?
constant temperature when a substance changes from solid state to become liquid at a specific pressure
heating graph
where does the kinetic energy come from?
when heated, heat is being absorbed and heat energy changes to kinetic energy and it increases to speed the process
an aluminium atom has 13 protons and 14 neutrons. what is the nucleon number?
13+14 = 27
chlorine consists of two isotopes. 35CI17 and 37CI17. the natural abundance of 35CI17 is 75% and 37CI17 is 25%. calculate the relative atomic mass of chlorine
=(75x35)+(25x37)/100
=35.5