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Chemistry Test Paper
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This is a chemistry practice paper I answered on topics like bonding, and the periodic table.
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Some examples from this set of practice questions
1.
How many elements did Mendeleev first put in his periodic table?
Answer: He first put 63 elements.
2.
Why did Mendeleev put iodine after tellurium even though it has a lower atomic mass?
Answer: Because iodine had more protons and he wanted to keep it in line with fluorine, chlorine and bromine.
3.
What is the definition of atomic number?
Answer: It is the number of protons in an element e.g. iodine has an atomic number of 53
4.
How did Mendeleev organise the periodic table?
Answer: He organised it so vertical columns would be increasing atomic mass and horizontal rows would be elements of similar properties.
5.
Why did he leave gaps?
Answer: Because he knew more elements would be discovered.
6.
What element did the prediction \\\"eko silicon\\\" turn out to be?
Answer: Germanium
7.
Which side of the periodic table is metals on
Answer: The left
8.
Name 3 properties of metals
Answer: malleable, ductile, good conductors, and luster
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Some examples from this set of practice questions
1.
What are the three types of bonding?
Answer: Ionic, covalent, metallic
2.
What is ionic bonding?
Answer: When a metal bonds to a non metal and the electrons are transferred.
3.
What is covalent bonding?
Answer: When two non metals are bonded, they share electrons and it can either be a simple covalent structure or a giant covalent structure.
4.
What is metallic bonding?
Answer: It’s the electrostatic attraction between positive metal ions and delocalised electrons
5.
What is simple covalent bonding?
Answer: Simple covalent bonds have lower melting and boiling points as the intermolecular forces are weaker.
6.
What is giant covalent bonding?
Answer: Giant covalent is stronger and has higher melting and boiling points due to its stronger intermolecular forces.
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