Brass is an alloy of copper and zinc. Why is brass stronger than pure copper or pure zinc?
The strengths of pure copper and pure zinc add together
The lattice structure is distorted because the copper and zinc atoms are different sizes
The atoms are more strongly bonded together
What is an alloy?
A pure metal
A metal with another metal mixed in
A soft type of metal
Approximately how many carbon atoms might be linked together in a polymer molecule?
Five
Fifty
Ten thousand
The monomers in addition polymerisation are what type of molecule?
Alkynes
Alkanes
Alkenes
What monomer is used to make poly(chloroethene)?
Chloroethane
Ethane chloride
Chloroethene
What type of reaction produces poly(ethene) from ethene?
Addition
Condensation
Substitution
Which monomers join to make DNA?
Sugars
Nucleotides
Amino acids
Which natural polymer is made from amino acids?
Starch
Cellulose
Protein
How many types of monomers are needed to form a polyester?
One
Two
Three
Which two functional groups do the monomers need to make a polyamide?
Carboxylic acid and alcohol
Carboxylic acid and amine
Amine and alcohol