C1 - C3 Paper Flashcards
Carbon dioxide exists as a simple molecule.
Why do simple molecules have a low boiling points?
Simple molecules have weak intermolecular forces between the molecules
Mendeleev’s arrangement of elements led to our modern Periodic Table.
How did Mendeleev arrange the elements in his Periodic Table?
In order of increasing atomic mass and similar chemical properties
What is the name of a charged particle consisting of two or more atoms joined together?
Polyatomic ion
Which of the following state of matter involves the transfer of energy to particles from the surroundings?
Melting
Magnesium reacts with dilute hydrochloric acid. When the reaction is complete, some magnesium is still visible. What does this mean?
Hydrochloric acid is the limiting reactant
Which gas is produced when a metal reacts with a dilute acid?
Hydrogen
Why is a polystyrene cup used instead of a beaker.
It keeps the heat trapped so gives a more accurate result.
Explain why the mixture becomes less alkaline as acid is added.
pH decreases as more H+ ions are added.
State two types of structure that carbon can make.
Rings and Chains
Solid Magnesium cannot be compressed. Why?
Particles are close together. Forces between particles in a liquid are weaker.
What is meant by Avogardo’s constant?
The number of entities in one mole.
Explain why nanotubes are so strong?
They are covalent bonds. The bonds are very strong and require lots of energy to break.
The reaction is exothermic. Explain why. Use ideas about bonds.
Bond Breaking is endothermic, bond making is exothermic. More energy is given out in bond making than is taken in in bond breaking.
Describe what is meant by ionic bonding.
The electrostatic force of attraction between oppositely charged ions.
Why is it important that scientists publish their results.
So other scientists can check, they can share ideas and gain acknowledgement.
