atoms, elements and compounds Flashcards
what sort of reaction is bond-breaking
energy is absorbed to break bonds so therefore it is endothermic
what sort of reaction is bond-making
energy is released so it is an exothermic process
endothermic
absorption of heat
exothermic
release of heat
calculating energy transferred
energy transferred = mass of water heater x specific heat capacity x temp rise
what does 1cm cubed equal to
1 gram
what does 1KJ equal to?
1000J
what happens in an endothermic reaction.
the products are at a lower energy than the reactants
what happens in an exothermic reaction
the products are at a higher energy than the reactants
what is the nucleon number? (the mass number)
the largest number
what is the proton number
the bottom number
what is an isotope
atoms of the same element, where the protons and electrons are the same but the neutron number is different
properties of isotopes
radioactive isotopes have a radioactive nuclei. the nuclei breaks down and as this happens they release particles or rays. the measurement of the rate of emission of these particles have many uses
uses of radiation
cancer treatments
to find leaks in pipelines
what is the group number
the amount of electrons on the outer shell. goes across the top