Unit 1 Flashcards
(43 cards)
What is a covalent bond?
A covalent bond is a shared pair of electrons between 2 non metal atoms.
What does an atom contain in the nucleus?
protons and neutrons
What is an isotope?
Same atomic number, different mass number
What is the shape of a molecule with the formula CH4
Tetrahedral
Is Hydrogen a diatomic molecule?
Yes-along with oxygen, nitrogen, fluorine, chlorine, bromine and iodine
What is a catalyst?
A catalyst is a substance that speeds up a chemical reaction whilst remaining unchanged
How do you find the mass number?
number of protons + number of electrons
What is the charge of an electron?
An electron is negative
What is the mass of a proton?
1 amu
How do you increase the rate of a chemical reaction?
Increase the temperature, add a catalyst, decrease surface area
What is the unit for concentration?
mol l-1 s-1
How many electrons does the second electron shell hold?
8 electrons
What shape does the third electron shell have?
Tetrahedral
Why do atoms create covalent bonds?
To create a steady electron arrangement
What number does the prefix ‘penta’ stand for?
5
Do metal ions lose or gain electron(s)?
Metal Ions loose outer electrons
T/F- Ions are charged
True
T/F- atom have unequal amounts of protons and electrons
False- atoms have equal amounts of protons and electrons
What element is Mg?
Magnesium
What is the formula for the mole?
m= GFM x n
Does covalent molecular have high or low melting/boiling points?
Low
What does delocalised mean?
Delocalised means that the outer electrons are free to move about
Do metals conduct electricity?
Yes
Do covalent solutions conduct electricity?
They do not conduct electricity as they do not have any charged particles.
