Chemistry Flashcards
How many electrons can fit in the first second third etc shell
First shell can fit 2
Second 8
Third 8
History of atomic theory
It has changed/progressed over time
Charge, size and weight of a neutron electron and proton
Protons are large, positive and heavy
Electrons are small, negative and light
Neutrons are large, no charge and heavy
What does the atomic number equal?
The atomic number equals the amount of protons and electrons
How do you find the number of neutrons?
You take the atomic number away from the mass number
What is the law of conservation of mass?
Matter can neither be created or destroyed
Who came up with the law of conservation of mass?
A scientist called Lavoisier
What can block alpha rays?
Can be blocked by paper, poses little hazard to the external body.
What can stop beta rays?
Travels fast, can penetrate human skin, wood and plastic can block it
Gamma rays
Waves are emitted in bursts, travels at extreme speeds, easily penetrates human skin, can cause serious, permanent damage to skin and tissue, thick concrete or led can block it
What’s the law of constant proportions
law stating that every pure substance always contains the same elements
What is carbon dating?
Radiocarbon dating is a radiometric dating technique that uses the decay of carbon-14 to estimate the age of organic materials, such as wood and leather, up to about 58,000 to 62,000 years Before Present
What’s a combustion reaction?
Combustion reactions involve products reacting with oxygen and heat energy being released.
