KI Chemistry Unit 4: Section 1 Review

Section 1 What are two pieces of information you can gain from looking at a chemical equation? 2Li (s) + H2O (l) → 2LiOH (s) + H2 (g)

Section 1 What are two pieces of information you can gain from looking at a chemical equation? 2Li (s) + H2O (l) → 2LiOH (s) + H2 (g) The types of substances involved The phases of the substances involved

What would you OBSERVE if you saw this chemical equation? Li (s) + H2O (l) → LiOH (s) + H2 (g)

What would you OBSERVE if you saw this chemical equation? Li (s) + H2O (l) → LiOH (s) + H2 (g) You would see bubbles because of the gas produced and a solid remaining.

What pieces of information can you only gain from observation of a reaction only?

What pieces of information can you only gain from observation of a reaction only? Color changes Temperature change Rate or speed of the reaction

You watch an experiment conducted and the solution changes color from clear to blue and a gas is emitted. Why would you need a chemical equation?

You watch an experiment conducted and the solution changes color from clear to blue and a gas is emitted. Why would you need a chemical equation? In order to know what substances are reactants and what substances are produced. As well as the amounts of elements involved.

What is the difference between a chemical and a physical equation?

What is the difference between a chemical and a physical change? Chemical – produces new products and substances 2H2(g) + O2(g) →2 H2O (l) Physical- changes in phase NaCl(s) → NaCl(l)

Label each of the following equations as chemical or physical CaCO3 (s) → CaO (s) + Co2(g) H2O (g) → H2O (l) 2K (s) + 2HCl (aq) → 2KCl (aq) + H2(g)

Label each of the following equations as chemical or physical CaCO3 (s) → CaO (s) + Co2(g) Chemical H2O (g) → H2O (l) Physical 2K (s) + 2HCl (aq) → 2KCl (aq) + H2(g) Chemical

How would you write a correct interpretation of this reaction using words. 4 Al(s) + 3O2(g) → 2Al2O3(s)

How would you write a correct interpretation of this reaction using words. 4 Al(s) + 3O2(g) → 2Al2O3(s) Solid Aluminum reacts with gaseous oxygen to produce solid aluminum oxide.

Does the following chemical equation follow the Law of Conservation of Mass? 2 Na (s) + Cl2(g) → 2NaCl(s)

Does the following chemical equation follow the Law of Conservation of Mass? 2 Na (s) + Cl2(g) → 2NaCl(s) Yes because there are the same amount of atoms before and after the reaction. Nothing is created or destroyed.

What number can you change when you are trying to balance the equation? Coefficients or Subscripts?

What number can you change when you are trying to balance the equation? Coefficients or Subscripts? Coefficients only!!!! The number in front of the compound.

Balancing Equations practice ______ As +______ Cl2 → _____AsCl5

Balancing Equations practice ______ As +______ Cl2 → _____AsCl5

______NaN3 → _______Na + ______N2

______NaN3 → _______Na + ______N2

____SiO2 + ______C → ____Si + ______CO

____SiO2 + ______C → ____Si + ______CO

____ Li + ______ O2 → _____Li2O

____ Li + ______ O2 → _____Li2O

___Al + ____Fe3O4 → ____Fe + ____Al2O3

___Al + ____Fe3O4 → ____Fe + ____Al2O3

____ Li + _____N2 → _____Li3N

____ Li + _____N2 → _____Li3N

Combination, Decomposition, Single and Double exchange 2 NaN3 → 2Na +3N2 SiO2 + 2C → Si + 2 CO 6 Li + N2 → 2 Li3N BaCl2 + Ag(NO3) → AgCl (s) + Ba(NO3)2

Combination, Decomposition, Single and Double exchange 2 NaN3 → 2Na +3N2 Decomposition SiO2 + 2C → Si + 2 CO Single Exchange 6 Li + N2 → 2 Li3N Combination BaCl2 + Ag(NO3) → AgCl (s) + Ba(NO3)2 Double Exchange

PbCO3(s) is a toxin. How can this enter your body? Explain how you got your answer.

PbCO3(s) is a toxin. How can this enter your body? By ingestion. Explain how you got your answer. Because the toxin is in the form of a solid (s)