Concept Check
What are the signs that a chemical reaction has occurred?
1) light emitted
2) change in colour
3) gas is formed (bubbles)
4) precipitate (solid) is formed
5) change in odour
6) change in temperature
Name the following compound: LiF. Why is it an ionic compound?
lithium fluoride
It is an ionic compound because the first part of the name is a metal ion whereas the second part of the name is a non-metal ion.
Name the following compound: CO. Why is it a molecular compound?
carbon monoxide
It is a molecular compound because both parts of the name are non-metals.
What type of chemical reaction is this? Water → hydrogen + oxygen
Decomposition reaction
Name the diatomic elements. (Hint: "diatomic 7")
1) hydrogen 2) nitrogen 3) oxygen 4) fluorine 5) chlorine 6) bromine 7) iodine
The law of conservation of mass is that the mass in a chemical reaction can't be created or destroyed. For our purposes, the mass of the atoms making up the reactants will be the same mass of the atoms making up the product(s).
Write the chemical formula for calcium chloride.
CaCl2
Quick learning check: What is the difference between an ionic compound and a molecular compound?
Ionic compounds= Involves the transfer of electrons. Compound involves a metal and a non-metal.
Molecular compounds= Involves the sharing of electrons between two non-metals.
Predict the products given the reactants:
lead (II) nitrate + magnesium fluoride →
lead (II) nitrate + magnesium fluoride → magnesium nitrate + lead (II) fluoride
Pb(NO3)2 + MgF2 → Mg(NO3)2 + PbF2
Balance the following chemical equation: ___ As + ___ O2 → ___ As2O5
What type of reaction is this?
4 As + 5 O2 → 2 As2O5
This is a synthesis reaction.
Identify the information listed for the element beryllium: a) symbol b) atomic number c) number of protons d) number of electrons
a) Be b) 4 c) 4 d) 4
Write the chemical formula of aluminum oxide.
Al2O3
Write the chemical formula of sulfur dioxide
SO2
Predict the product given the reactants. Identify the type of reaction? (Note the charge of copper is 1+)
copper + silver nitrate →
copper + silver nitrate → silver + copper nitrate
Cu + AgNO3 → Ag + CuNO3
Single displacement reaction
Balance the following equation: ___ K + ___ Br2 → ___ KBr
2 K + Br2 → 2 KBr
Predict whether a chemical reaction has occurred for the following process: Frying chicken. If yes, state the evidence.
Yes. Evidence: Change in odour and colour.
Name the following compound: NaBr
sodium bromide
Write the chemical formula for carbon tetrachloride.
CCl4
Predict the products given the reactants:
Na2SO4 + LiCl2 →
Na2SO4 + LiCl2 → LiSO4 + NaCl
Balance the following chemical equation: ___ S + ___ O2 → ___ SO3
2 S + 3O2 → 2 SO3
Write the chemical formula of potassium sulfide.
K2S
Name the following compound: NO. Is this a molecular compound?
nitrogen monoxide.
Yes, it is a molecular compound because both nitrogen (N) and oxygen (O) are non-metals.
Write the balanced reaction for the synthesis of NaCl.
2Na + Cl2 → 2 NaCl
Write the balanced chemical equation for the reaction between sodium hydroxide and calcium bromide.
2NaOH + CaBr2 → 2 NaBr + Ca(OH)2