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Chem BM 1
| Question | Answer |
|---|---|
| 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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