Let's React: Exam revision Flashcards
What is the atomic number?
The number of protons in the nucleus of an atom.
What is a proton?
A subatomic particle that has a positive charge and that is found in the nucleus of an atom.
What is a neutron?
A subatomic particle that has no charge and that is found in the nucleus of an atom.
What is an electron?
A subatomic particle that has a negative charge.
What is mass number?
The total number of protons and neutrons in a nucleus of an atom.
How many neutrons are in a sodium-23 atom?
12
How can the number of neutrons in the nucleus of an atom be calculated?
Mass number - atomic number.
How many neutrons are in a chlorine-37 atom?
20
What is the electron configuration of a phosphorus atom?
2, 8, 5
What is the electron configuration of a calcium atom?
2, 8, 8, 2
What is a cation?
Formed when a metal atom loses valence electrons.
What is an anion?
An ion with a negative charge.
What happens to energy when an electron moves from a higher energy level to a lower energy level?
Energy is emitted.
What is the charge on an oxide ion?
2-
What is the charge on an aluminium ion?
3+
What is the charge on a nitride ion?
3-
What is the charge on a magnesium ion?
2+
How many electrons are in a sodium ion?
10
How many electrons are in a chloride ion?
18
What is the formula for sodium hydroxide?
NaOH
What is the formula for sodium carbonate?
Na2CO3
What is the formula for silver sulfate?
Ag2SO4
What is the formula for iron(III) nitride?
FeN
How many grams of hydrogen are required to react with 100 g of nitrogen to produce 121 g of ammonia?
21
How many grams of water are produced when 16 g of methane reacts with 64 g of oxygen to produce 44 g of carbon dioxide and water?
36
What are some evidence of a chemical reaction?
Colour change, bubbles, heat produced.
What are coefficients used for in chemistry?
Used to balance chemical equations.
What does reaction rate measure?
How quickly reactants are turned into products.
What does collision theory state about energy?
For a reaction to occur, particles must collide with the correct orientation and with enough energy.
What is a catalyst?
Used to speed up a chemical reaction but is not used up in the reaction.
How can reaction rate be increased by increasing surface area?
Crushing a solid is an example.
What can increase the reaction rate along with concentration and surface area?
Temperature.
What is the atomic number of a sodium atom with 11 protons and 12 neutrons?
11
What is the mass number of a sodium atom with 11 protons and 12 neutrons?
23
What is the electron configuration of a sodium atom with 11 protons and 12 neutrons?
2, 8, 1
What is the charge on the ion formed by sodium?
1+
