Chemical vs Physical
Which of the following is a chemical change?
a) Melting ice
b) Rusting iron
c) Cutting paper
b) Rusting Iron
What law states atoms are not created nor destroyed in a chemical reaction?
Law of Conservation of mass (matter)
A + B --> AB is what type of reaction?
Synthesis
Ca +O2 --> what?
CaO: Calcium Oxide
List one clear sign that a chemical change has occured
Formation of Gas, Formation of Precipitate, Fizzing, Color Change, Temp Change, Light Produced, ect.
Balance:
H₂ + O₂ --> H₂O
2,1,2
2kClO₃ --> 2kCl + 3O₂ is what type of reaction
Decomposition
When sodium reacts with chlorine gas, what compound will form?
NaCl : Sodium Chloride
Is boiling water chemical or physical? Explain
It is physical because you are turning liquid water into gaseous water. The substance of water is not changing; you are just changing the state of matter.
Balance:
Mg + HCl --> MgCl₂ + H₂
1,2,1,1
Indentify the following type of Reacton
Cu + 2AgNO₃ --> 2Ag + Cu(NO₃)₂
Single Replacement
Predict the Products of the reactants AgNO₃ + NaCl
AgCl + NaNO3
Explain how to tell the difference between a physical and chemical change in a lab setting
a new substance is formed (color, gas, light, temp) if there is no new substance, then it is a physical change
Balance:
C₃H₈ + O₂ --> CO₂ + H₂O
1,5,3,4
Na₂SO₄ + BaCl₂ --> BaSO₄ + 2NaCl
What is this reaction?
Double replacement
Predict the products: Iron (III) Fe + Copper (II) Sulfate CuSO4 ----> ?
Give three Examples of Physical changes and Give three example of chemical changes
Answers will vary
Balance:
Ca(OH)2 + H3PO4 --> Ca3(PO4)2 + H2O
3, 2,1,6
Identify and Balance this reaction.
C₄H₁₀ + O2 --> CO₂ + H₂O
Combustion and the coffeicents are 2,13,8,10
Predict the products of a combustion reaction of C₃H₈.
Yes, I want to know how many molecules of each.
3 carbon dioxide molecules and 4 water Molecules
(C₃H₈ + 5O₂ --> 3CO₂ + 4H₂O)