Science-Metals,Acids and Alkalis
What is the definition of Oxidation
Adding oxygen to a substance
Where are the most reactive metals on the reactivity series.
The top
What is covalent bonding
It is the sharing of electrons in the outer shell of the atom.
What happens in oxidation reactions
Oxygen is added into a compound
What is a spectator ion
A spectator ion that doesn't change during a reaction
How do you form a combonation reaction
A+B=AB
How do you form a decomposition reaction
AB=A+B
Define reactant
A reactant is the substance that you have at the start of a reaction
What does a catalyst do
Speed up a reaction
Save energy
Saves time
Define titration
It is to measure the volumes of acids and alkalis
Define element
A element is a substance that has only one kind of atom
Increasing the temp of a reaction increases what
The collisions
What happens to catalysts in a reaction
It is not used up
How do you form a neutralization reaction
Acid+Alkali=Salt+Water
Define exothemic reactions
They are reactions that give off heat to the surroundings
Give an example of an exothermic reaction
Combustion/burning
Respiration
Neuralization
Rusting
Define endothermic reactions
They are reactions that take in heat from the surroundings
Give an example of endothermic reactions
Melting ice
Thermal decomposition
Photosynthesis
What are the atoms like in chemical reactions
They are conserved
Is hydrogen flammable
Yes
Why are alloys useful
They tend to be harder than pure metals
Why are pure metals useful
They have atoms that are arranged in layers
They are also soft and malleable
What are alloys made from
A mixture of metals
What are the atoms like in alloys
They have metal atoms in different sizes that are mixed up with eachover
What are the disadvantages of alloys
It is harder for them to slide over each other
The atoms are not arranged so they are distorted
What are examples of alloys
Brass
Steel
Bronze
What is the calculation for density
Density=Mass/Volume
What happens if something has a density over 1g/cm3
It will sink
How can you increase density
By adding more particles to the fixed volume
Do solids have a high or low density
High
How can you calculate volume
length x width x height
What does MASH stand for
Metal+Acid=Salt+Hydrogen