Chemistry 2 Full Quiz
Made by myself :) Hope it helps!
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- Created by: Amraahx
- Created on: 01-01-13 12:33
Why is it not always possible to obtain the calculated amount of a product?
It might be a reversible reaction, some of the reactants may react in ways different to the expected reaction, or some of the product may have been lost when it was separated from the mixture
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What is the charge of a proton, neutron and electron?
Proton= +1, Neutron=0, Electron= -1
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What is the mass of a proton, neutron and electron?
Proton=1, Neutron=1, Electron=Very small
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When can chemical reactions occur?
When reacting particles collide with each other and with sufficient energy (activation energy)
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What is the definition for activation energy?
The minimum amount of energy particles need in order to react when they collide.
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How does increasing the temperature increase the rate of reaction?
Particles have more kinetic energy, so they collide more frequently and more energetically and so increasing the chances of successful collisions
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If the reaction is endothermic in one direction what is it in the opposite direction?
Exothermic
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What do chemical reactions involve?
Energy transfers
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Why in industrial processes do energy requirements and emissions need to be considered?
For economic reasons and sustainable development
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What are reversible reactions?
When the products of the reaction can react to produce the original reactants
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What is atom economy?
A measure of the amount of starting materials that end up as useful products
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Why is a reaction with a high atom economy useful?
sustainability and economical reactions
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Why is equilibrium reached when a reversible reaction takes place in a closed system?
The reactions occur at exactly the same rate in each direction
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What is an endothermic reaction?
A reaction that takes in energy from the surroundings usually in the form of heat
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What is an example of an endothermic reaction?
thermal decomposition
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What is an exothermic reaction?
A reaction that gives out energy to the surroundings usually in the form of heat
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what is an example of an exothermic reaction?
Combustion, oxidation, neutralisation
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What is the Haber process used for?
To manufacture ammonia
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What are the raw materials for the Haber Process?
Nitrogen and Hydrogen
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Where are the raw materials for the Haber Process taken from?
Nitrogen (obtained from the air), Hydrogen (obtained from natural gas or crude oil)
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How can we increase the rate of reaction?
Increase the: temperature, concentration, pressure, surface area and use a catalyst
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How big are nanoparticles?
1-100 nm
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How do we calculate the percentage yield?
mass of product obtained/maximumtheoretical mass of product
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How do we calculate the rate of reaction?
amount of reactants used (or formed)/time
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When atoms lose electrons what charge do they have?
Positive
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Do metals or non metals lose electrons?
Metals
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When atoms gain electrons what charge do they have?
Negative
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Do metals or non metals gain electrons?
Non metals
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Why do giant ionic lattices have high melting/boiling points?
Due to the large amounts of energy needed to break the bonds
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Can giant ionic lattices conduct electricity? How?
Yes, when the bonds are broken, ions are free to move and carry a charge so they can now conduct electricity
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What kind of a structure does a giant ionic lattice have?
Regular structure
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What kind of a bond do simple molecules have?
Covalent Bond
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Why don't simple molecules conduct electricity?
They don't have an overall charge as they are covalently bonded
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Why are simple molecules usually in the form of gases?
low melting/boiling points
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What is covalent bonding?
Two non metals sharing electrons
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What type of bond does a giant ionic lattice have?
An electrostatic force between oppositely charged ions in all direction
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Name 3 macromolecules (giant covalent structures)
Diamond, Graphite and Silicon Dioxide
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What are compounds?
substances in which atoms of two or more elements are chemically combined
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Why do atoms have no overall charge?
Number of protons is equal to the number of electrons and neutrons have no charge
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What are isotopes?
atoms of the same element with different numbers of neutrons
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What are the uses of nanoparticles?
catalyst, can conduct electricity
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why doesn't diamond conduct electricity?
It it covalently bonded to 4 other carbon atoms
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What can fullerenes be used in?
lubricants, catalysts, drug delivery into the body, in nanotubes for reinforcing material
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How does a pencil work?
graphite forms 3 covalent bonds with carbon atoms, they form layers and the layers are free to slide over each other so graphite is soft and slippery and the layers can easily be rubbed off onto paper
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Why can graphite conduct heat and electricity?
one electron from each carbon atom is delocalised so it can carry a charge and conduct electricity
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why can ionic compounds conduct electricity when melted?
Ions are free to move and carry a charge and conduct electricity
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Why is diamond very hard?
It forms 4 covalent bonds with other carbon atoms in a giant structure
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Other cards in this set
Card 2
Front
What is the charge of a proton, neutron and electron?
Back
Proton= +1, Neutron=0, Electron= -1
Card 3
Front
What is the mass of a proton, neutron and electron?
Back
Card 4
Front
When can chemical reactions occur?
Back
Card 5
Front
What is the definition for activation energy?
Back
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