C1 - 7 Calculations Flashcards
What does the Ar of any element = ?
The mass of the element
What does the RFM (Mr) of any compound = ?
All the mass numbers of elements in a compound added together
What does 1 mole = ?
The Ar or Mr of the substance in grams(g) depending weather it is an element or a compound
What does the Number Of Moles = ?
Mass(g) / Ar or Mr
What is the equation for concentration?
= Mass (g) / Volume (dm3)
Name an unreactive metal and where they can be found?
Gold and native
How can metals less reactive than carbon be extracted?
Through reduction with carbon
What do metals react with oxygen to produce?
Metal oxides
What must metals above carbon in the reactivity series be extracted by?
Electrolysis
What must metals below carbon in the reactivity series be extracted from their ores?
By reduction
What 4 metals don’t need to be extracted?
Gold, Silver, Platinum and copper
What occurs at the positive electrode?
Oxidation
What occurs at the negative electrode?
Reduction
what is electrolysis?
The breaking down of compounds using electricity
What is another name or the positive electrode?
Anode
What is another name or the negative electrode?
Cathode
What is the electrolyte?
The ionic compound that is molten or dissolved in water
What is an exothermic reaction?
When the reactions release energy
What is an endothermic reaction?
When the reactions absorb the energy
During a chemical reaction why must energy be supplied?
To break the bonds in the reaction
During a chemical reaction when is the energy released?
When bonds in the product are formed
What happens to the energy during an exothermic reaction?
The energy required to break bonds is less than the energy released when new bonds are formed
What happens to the energy during an endothermic reaction?
The energy required to break bonds in greater than the energy released when new bonds are formed
