Chem BM 1 Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
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
Popular Chemistry sets