Atomic Structure
Describe what the structure of an atom.
Atom has a dense centre with protons, neutrons and electrons arranged outside.
How many valence electrons does oxygen have?
6 valence electrons
why do atoms form bond?
to become stable
to have a full valence shell
What shape does N2 have?
linear
Explain what collision theory is
Theory that says that the number of collisions and the speed of the collision will determine the rate of reaction.
What is the mass number for Aluminium?
What is its atomic number?
Aluminium mass number = 27,
atomic number = 13
When nitrogen gas N2, is drawn - how many chemical bond is formed? and explain why.
Nitrogen will have 3 bonds, because it needs 3 more electrons to become stable (8 electrons)
what type of bond is formed when between oxygen and oxygen?
Non-polar covalent
what shape does NH3 have?
trigonal pyramid
Koko samoa dissolves faster as a powder than as a lump. Explain why?
Powder has more surface area, easier to dissolve.
How many neutrons does Aluminium have? mass number 27, atomic number 13.
27-13 = 14 neutrons
How many lone pairs around nitrogen in NH3?
1 lone pair
What type of bond is formed between CO2?
polar covalent bond
what shape does CH4 have?
tetrahedral
Does the amount of sugar dissolved affect the texture of the ice cake?
Yes, the more sugar the softer the ice cake
Write the electron arrangement for Phosphous 15
2,8,5
How many bonding pair of electrons does oxygen O2 have?
When a metal is bonded to a metal, what kind of bond is it?
metallic bond
VSEPR stands for?
what does it mean?
valence shell electron pair repulsion
What are four factors that affects the rates of reaction?
temperature
surface area
concentration
catalyst
How many valence electrons does Argon have?
8
What are valence electrons? and why is it that only them are drawn in Lewis structures?
Valence electrons are outermost electrons, and they are the electrons that are mobile. Inner electrons do not react.
an atom with electron arrangement 2,8,1 is bonded to atom with 2,8,7. What type of bond is present?
Ionic bond
Explain why NH3 has a trigonal pyramid shape, while H2O has a v-shape
it depends on the number of lone pair and bonding pair of electrons. They rebel each other. VSEPR.
What is a control?
Think back to our experiement of sugar and water. What was our control?
our control was the amount of water we put in the cups.