C1 - Chemistry Flashcards
What are the properties of a chemical change
A chemical change makes new products and is almost impossible to reverse and if not impossible, it is extremely difficult. The bonds between particles also break and new bonds are formed.
What are the properties of a physical reaction?
A physical reaction has no new products made, are easily reversible and no bonds are broken
What is the mean distance of an atom?
3.4 x 10 to the power of -9
What is the mean distance between 2 helium atoms?
6.2 x 10 to the power of -11
What is the ratio of distance to diameter?
Distance between atoms / diameter of the atom
What are the limitations of the particle model?
The forces between particles, the size of the particles and the space between particles.
What is an atom?
An atom is the smallest particle of an element that still has its chemical properties. Different elements are made from different atoms.
What is a molecule?
A molecule is made from 2 or more atoms joined together. They are joined by attractive forces called chemical bonds.
What is the typical size of the atomic radius of an atom and the bond length of an atom?
1 x 10 to the power of -10
What is the relative mass of a proton, neutron and an electron?
Proton = 1 Neutron = 1 Electron = 0.0005
What is the relative charge of a proton, neutron and electron?
Proton = +1 Neutron = 0 Electron = -1
What is inside of an atom?
An atom is mainly just empty space that contains negatively charged electrons, electrically neutral neutrons and positively charged protons.
What is the atomic mass or mass number?
The atomic mass is the protons and neutrons.
What is the atomic number?
The atomic number is the amount of protons.
What is the symbol for the atomic mass or mass number?
A
What is the symbol for the atomic number?
Z
What is an ion
Ions are charged particles that atom(s) have lost or gained electrons
What is an isotope?
An isotope is a different atomic form of the SAME element; they have the SAME number of protons but a DIFFERENT number of neutrons.
What was John Dalton’s version of the atom?
It was an unpenetrable sphere and that different elements had different atoms.
What version of the atom did J.J Thompson do?
He created the plum pudding model which was penetrable and had negative bits inside a positive sphere.
What particle model is Rutherford create?
He said that the atom was mainly empty space that had a positive nucleus with electrons orbiting around it.
What particle model did Bohr create?
He said that the electron were in fixed energy levels or shells around the nucleus.
What is the difference form Bohr’s study of the atom to the rest of the people?
Bohr studied the electrons and not the nucleus.
What is the relative atomic mass
The relative atomic mass is the mean mass of an atom of an element compared to 1/12 the mass of a carbon 12 atom.
What is the relative formula mass?
The relative formula mass is the mean mass of unit of substance compared to a carbon 12 atom.
What is the symbol of the relative atomic mass?
R.A.M or Ar
What is the symbol for the relative formula mass?
R.F.M or Mr
What is the relative formula mass usually used for?
For a molecule that contains multiple different atoms
What is the empirical formula?
An empirical formula shows the simplest whole number ratio of the atoms of each element in a compound for example:
C2H4O2 would equal to CH2O
What is room temperature?
25 degrees Celsius
In a graph question what would the 4 marks be
The size of the graph (3/4 of the page)
Accurate plotting
Line of best fit
Labelling X and Y axis
