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Chem BM 1

What are the main si base units? length (m), mass (kg), time (second), temp (kelvin)
define matter anything that takes up space , and has mass
define mass measure of the amount of matter
define atom smallest unit of an element that has all the properties of that element
define element pure substance made of 1 atom
define compound made of 2 or more elements that are chemically bonded
define physical properties quality of substance that can be measured without changing substance
define physical change change that does not change the substance
define chemical properties substance ability to go through changes that make it another substance
define chemical change changes that make it another substance
What are the 2 subgroups of mattter Mixture (blend of 2 or more kinds of matter) and Pure substance (have a fixed composition and cant be separated by physical means)
What are the 2 subgroups of mixtures homogenous (uniform solution) and heterogeneous (non uniform)
what was the cathode ray tube experiment? what did it prove rays produced were deflected from negative plate, proved atoms must have negatively charged particles and therefore + charged particles
What was the gold foil experiment, what did it prove shot alpha particles at gold foil, some bounced back, proved there was a dense nucleus with electron cloud around it
What was the plum pudding model early english model of what atom looked like which has evenly distributed + and - particles
What are isotopes identical atoms with different number of neutrons so different mass numbers
define ions atoms wtih different number electrons than protons
what is the average atomic mass? an average of the masses of all the isotopes
what 3 things help hold a nucleus together? strong forces, electromagnetic repulsion, proton to neutron ratio
what does strong force do? holds protons + neutrons together
what is the most stable neutron to proton ratio 1:1
define nuclear decay when a radioactive atoms continues to change until it becomes stable
beta particles are also known as high speed electrons
know the symbols of each emission
define nuclear fission nucleus splits into nuclei to become more stable
define nuclear fusion nuclei combine to become more stable
define half life time it it will take half a sample of any given element to decay
know half life equations
Created by: mhaq.16



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