Physics Paper 1 Flashcards
What is specific heat capacity?
How hard it is to heat something up. The amount of energy needed to raise the temperature of 1kg of a substance by 1°C.
What is Power?
The rate of energy transfer, or rate of doing work.
What is the equation for power which includes work done?
Power (W)= Work done (j) / Time (s)
What is density?
How many of it’s particles have been squished into a given space.
How long is the radius of an atom?
About 0.1 nanometres
What are 4 features of a nucleus?
- Comtains protons and neutrons
- Positive charge
- Almost the whole mass of an atom is concentrated in the nucleus
What are 3 features of electrons?
- Move around the nucleus in shells
- Negatively charged
- No mass
Why do atoms have no charge?
Because it has the sam enumber of protons (+) and electrons (-)
What are ions?
Atoms that don’t have an equal amount of protons and electrons (so they will have a charge, e.g 2- charge will mean that it has two more electrons than protons).
What does the mass number of an element tell us?
Total number of protons + neutrons
What does the atomic number of an element tell us?
Total number of electrons (which is equal to the number of protons).
What is an isotope?
Atoms with the same atomic number as the element but a different mass number (which means it has the same number of protons/electrons but a different amount of neutrons).
What did John Dalton discover and in what year?
In 1804 he was the first person to describe atoms as solid spheres.
What did JJ Thomson discover and in what year?
In 1897 he created the plum pudding model, which explained that the atom is a ball of charge with electrons scattered.
What did Ernes Rutherford discover and in what year?
In 1909 he did the alpha scattering experiment.
