Chapter 1 - Atomic Structure Flashcards
What type of substances are shown in the periodic table?
Elements
What type of substance is sodium chloride, NaCl?
A compound.
Write a word equation for the reaction between hydrogen and oxygen to produce water.
Hydrogen + Oxygen —–> water
Balance this equation: H2 + Br2 —-> HBr
H2 + Br2 —-> 2HBr
H2 is a gas. Which state symbol would you use to show a gas?
(g)
Which law states that the mass of the products formed in a reaction is equal to the mass of the reactants?
Law of conservation of mass.
Name three methods of separating mixtures.
Filtration, crystallisation, distillation.
Which method would you use to separate sand from a mixture of sand and water?
Filtration.
In fractional distillation, which liquid is collected first?
The liquid with the lowest bioloing point.
Name a method used to separate food dyes.
Paper chromatography.
Who proposed the ‘plum pudding’ model?
JJ. Thompson.
How many protons, neutrons and electrons are there in an atom of aluminium (atomic number 13, mass number 27)?
13 protons
13 electrons
14 neutrons
How does an atom form a positive ion?
By losing electrons.
An atom of carbon is represented as 12/6 C. What is the mass number of the carbon atom?
12
Two isotopes of hydrogen are 1/1 H and 2/1 H. State one difference between the two isotopes.
Have a different number of neutrons.
