Periodic Table
Define exothermic and endothermic reactions
Exothermic: energy is released (normally hot)
Endothermic: energy is absorbed (normally cold)
True or False: the atomic number is equal to the number of neutrons
False
Name this compound: Pb(SO4)2
Lead sulfate
Explain the law of conservation of mass
Mass can neither be created nor destroyed in a chemical reaction
Name the following reaction: A + BC --> AC + B
Single Displacement
Name the middle group on the periodic table
Transition metals
Name the location of protons, neutrons and electrons
Protons and neutrons: nucleus
Electrons: electron shells
Count the amount of and name the elements present in this compound: Fe(NO3)3
1 x Iron, 3 x Nitrogen, 6 x Oxygen
Explain the difference between a physical and chemical change
Physical: affects the form, and has no change in the chemical composition
Chemical: one or more substances are converted into another substance (e.g. iron into rust)
Identify the type of reaction: CaCO3 -> CaO + CO2
Decomposition
True or False: Nitrogen has 5 valence electrons
True
State the maximum number of electrons, the first 3 electron shells can have.
2, 8, 8
What is the formula for magnesium nitrate?
Mg(NO3)2
Balance this equation: NaBr + Ca(OH)2 -> CaBr2 + NaOH
2NaBr + Ca(OH)2 -> CaBr2 + 2NaOH
Write the chemical equation for: potassium metal and chlorine gas combine to form potassium chloride
2K + Cl2 -> 2KCl
What does a homogeneous mixture mean?
A mixture whose composition is uniform throughout
Draw a diagram of the electron shell of Sulphur
2, 8, 6
Draw the Lewis dot structure for phosphorus
List the different types of reactions
Combination, decomposition, combustion, single replacement, double replacement
Name the following reaction: NaOH + HCl --> NaCl + H2O
Double Displacement
Acid/Base
Can the term compound and term molecule can be used interchangeably?
All compounds are molecules. Not all compounds are molecules.
A molecule is 2 or more atoms joining together. A compound is a molecule with 2 different TYPES of atoms.
What are C-12 and C-13 an example of?
Isotopes
Explain the difference between ionic and covalent bonding
Ionic: valence electrons are transferred between atoms
Covalent: valence electrons are shared between atoms
Write the chemical equation for: Aluminium bromide and chlorine gas react to form aluminium chloride and bromine gas
2 AlBr3 + 3 Cl2 -> 2 AlCl3 + 3 Br2
Write the chemical equation for: Hydrogen gas and nitrogen monoxide react to form water and nitrogen gas
2H2 + 2NO -> 2H2O + N2