The Language of Chemistry
An elemental symbol is most similar to
a. word
b. sentence
c. letter
c. letter
How do you read this symbol?
-->
react to form
Balance the equation then list the coefficients in order:
__K + __Cl2 --> __KCl
2, 1, 2
2K + Cl2 --> 2KCl
List the four types of evidence you can use to determine if a chemical reaction occurred.
color change, temperature change, gas emission (bubbles), precipitate formation (solid from solution)
Name the two solutions we poured together in reaction 2 of the chemical reactions lab. (or give their chemical formulas)
sodium carbonate and copper (II) sulfate
Chemical Equation is most similar to:
a. sentence
b. word
c. letter
Sentence
How do you read this symbol?
+
and
Balance the equation then list the coefficients in order:
NaCl+F2-->NaF+Cl2
2NaCl+F2-->2NaF+Cl2
Identify the type of reaction:
2 Ag2O → 4 Ag + O2
Decomposition
What kind of reaction is this?
2 AlBr3+ 3 K2SO4 → 6 KBr + Al2(SO4)3
Double replacement
Chemical Formula is most similar to:
a. sentence
b. word
c. letter
b. word
Convert the word problem into a skeleton equation:
Sodium chloride and fluorine gas (F2) react to form sodium fluoride and chlorine gas (Cl2).
NaCl+F2-->NaF+Cl2
Based on the equation below, is conservation of mass observed? Explain your reasoning
Mg (s)+ 2 HCl (aq)-->MgCl2 (aq) +H2 (g)
Yes, there are the same number of atoms of each element on either side of the equation.
i.e. 2 hydrogen atoms on the reactant side and 2 hydrogen atoms on the product side.
What is the precipitate formed in the reaction below:
CuSO4(aq)+ Na2CO3 (aq)-->CuCO3(s) + NaSO4 (aq)
CuCO3(s)
What kind of reaction is this?
CH4 + 2 O2 → CO2 + 2 H2O
Combustion
Which gives you the number of atoms in a compound?
a. Subscript
b. Coefficient
Subscript
Read the following equation:
Mg (s)+ 2 HCl (aq) --> MgCl2 (aq) +H2 (g)
Magnesium and hydrogen chloride react to form magnesium chloride and hydrogen.
Balance the equation then list the coefficients in order:
__ H2+__NO→__H2O+__N2
2, 2, 2, 1
2 H2+2 NO→2H2O+N2
What type of reaction is 2H2(g)+O2(g)-->2H2O(l)?
Synthesis
Would this reaction give a precipitate?
NaOH(aq)+HCl(aq)→NaCl(aq)+H2O(l)
No, there is no solid on the products side of the equation.
Which gives you the number of compounds in a reaction?
a. Subscript
b. Coefficient
Coefficient
Read the following equation:
CaCl2+H2O→HCl+Ca(OH)2
Calcium chloride and water (H2O) react to form hydrogen chloride and calcium hydroxide.
Balance the equation then list the coefficients in order:
__AlBr3 + __K2SO4-->__KBr + __Al2(SO4)3
2, 3, 6, 1
2AlBr3 + 3K2SO4-->6KBr + Al2(SO4)3
What type of reaction is 2 C4H10 + 13 O2 → 8 CO2 + 10 H2O?
Combustion
Give a procedure for the performing the following chemical reaction:
NaOH(aq)+HCl(aq)→NaCl(aq)+H2O(l)
Add one pipette of NaOH to a test tube. Add one pipette of HCl to another test tube. Record your initial observations. At your lab station, pour NaOH into the HCl test tube. Record your during/after reaction observations to check for temperature change, color change, precipitate formation, and gas emission.