Pre-lab 4<\/p>\n
Title: Periodic Trends<\/p>\n
Date: 9\/12\/18<\/p>\n
Unknown: N\/A<\/p>\n
Purpose: The purpose is to observe chemical properties of elements in periods (rows) and in<\/p>\n
groups\/families (columns).<\/p>\n
Balanced Equations:<\/p>\n
Part 1: Chemical Properties of the Alkaline Earth Metal Nitrates<\/p>\n
Mg(NO3)2(aq) + Na2CO3(aq) \uf0ae MgCO3(s) + 2NaNO3(aq)<\/p>\n
Ca(NO3)2(aq) + Na2CO3(aq) \uf0ae CaCO3(s) + 2NaNO3(aq)<\/p>\n
Ba(NO3)2(aq) + Na2CO3(aq) \uf0ae BaCO3(s) + 2NaNO3(aq)<\/p>\n
Part 2: Chemical Properties of the Halides<\/p>\n
NaCl(aq) + AgNO3(aq) \uf0ae AgCl(s) + NaNO3(aq)<\/p>\n
NaBr(aq) + AgNO3(aq) \uf0ae AgBr(s) + NaNO3(aq)<\/p>\n
NaI(aq) + AgNO3(aq) \uf0ae AgI(s) + NaNO3(aq)<\/p>\n
Part 3: Reactivity of Third Period Elements with Oxygen<\/p>\n
2 Mg(s) + O2(g) \uf0ae 2 MgO(s)<\/p>\n
4 Al(s) + 3 O2(g) \uf0ae 2 Al2O3(s)<\/p>\n
Si(s) + O2(g) \uf0ae SiO2(s)<\/p>\n
Part 4: Reactivity of Third Period Elements with Hydrochloric Acid<\/p>\n
Mg(s) + 2 HCl(aq) \uf0ae MgCl2(aq) + H2(g)<\/p>\n
2 Al(s) + 6 HCl(aq) \uf0ae 2 AlCl3(aq) + 3 H2(g)<\/p>\n
Si(s) + 4 HCl(aq) \uf0ae SiCl4(aq) + 2 H2(g)<\/p>\n
Table of Chemical and Physical Properties:<\/p>\n
Chemical Name Molecular<\/p>\n
Weight<\/p>\n
Boiling Point Density Safety<\/p>\n
Barium nitrate<\/p>\n
Ba(NO3)2<\/p>\n
261.34<\/p>\n
529\uf0b0 C 3.24 g\/cm<\/p>\n
3 Poisonous. Do<\/p>\n
not mix with<\/p>\n
flammable<\/p>\n
materials.<\/p>\n
Silver nitrate<\/p>\n
AgNO3<\/p>\n
169.87 440\uf0b0 C 4.35 g\/cm 3 Corrosive and<\/p>\n
toxic. Avoid<\/p>\n
skin contact.<\/p>\n
Sodium Chloride<\/p>\n
NaCl<\/p>\n
58.44 801\uf0b0 C (melting<\/p>\n
point)<\/p>\n
2.16 g\/cm3 Nonhazardous<\/p>\n
Magnesium<\/p>\n
Mg<\/p>\n
24.31 650\uf0b0 C (melting<\/p>\n
point)<\/p>\n
1.738 g\/cm3 Flammable. Do<\/p>\n
not stare are<\/p>\n
flame during<\/p>\n
reaction with<\/p>\n
magnesium and<\/p>\n
oxygen<\/p>\n
Calcium<\/p>\n
Ca<\/p>\n
40.08 842\uf0b0 C (melting<\/p>\n
point)<\/p>\n
1.54 g\/cm3 Flammable<\/p>\n
gases produced<\/p>\n
with in contact<\/p>\n
with water<\/p>\n
Aluminum<\/p>\n
Al<\/p>\n
26.98 2460\uf0b0 C 2.7 g\/cm 3 Flammable<\/p>\n
Silicon<\/p>\n
Si<\/p>\n
28.09 2355\uf0b0 C 2.33 g\/ml Nonhazardous<\/p>\n
Oxygen<\/p>\n
O<\/p>\n
15.999 u 90.188 K 1.429 g\/L Flammable gas<\/p>\n
Hydrochloric<\/p>\n
acid<\/p>\n
HCl<\/p>\n
36.46 110\uf0b0 C 1.18 g\/cm 3 Toxic and<\/p>\n
corrosive. Can<\/p>\n
cause irritation<\/p>\n
or burns to skin.<\/p>\n
Procedure Observation<\/p>\n
Part 1<\/p>\n
1. Add 1ml of each solution to each labeled test tubes<\/p>\n
2. Add about three drops of solution from tube 4 into tubes 1-3 and record<\/p>\n
observations.<\/p>\n
Part 2<\/p>\n
3. Repeat steps 1&2 for part 2 with different solutions<\/p>\n
Part 3<\/p>\n
4. On a watch glass, add small pieces of magnesium, aluminum and silicon and<\/p>\n
observe physical appearances.<\/p>\n
5. Take turns placing each substance over an open flame and record<\/p>\n
observations.<\/p>\n
Part 4<\/p>\n
6. Place a small piece of magnesium, aluminum, and silicon in separate test<\/p>\n
tubes and label appropriately.<\/p>\n
7. Place 1ml of HCl into each test tube and record observations.<\/p>\n
All observations are documented in the data<\/p>\n
tables below<\/p>\n
Data Collected:<\/p>\n
Part 1<\/p>\n
Aqueous<\/p>\n
substances<\/p>\n
Observations after reacting with 0.02 M Na2CO3<\/p>\n
Mg(NO3)2 No physical change observed<\/p>\n
Ca(NO3)2 Semi-solid, cloudy substance formed and sunk to the bottom of the test tube<\/p>\n
Ba(NO3)2 Solution became milky and slowly sunk to the bottom<\/p>\n
Part 2<\/p>\n
Aqueous<\/p>\n
substances<\/p>\n
Observations after reacting with 0.10 M AgNO3<\/p>\n
NaCl Slow reaction. Started a bluish color and became milkier<\/p>\n
NaBr Top layer of solution turned a milky color and slowly spread throughout<\/p>\n
NaI Slow reaction. Went from a translucent yellow to a bluish color<\/p>\n
Part 3<\/p>\n
Metallic<\/p>\n
substances<\/p>\n
Observations during and after reaction with atmospheric O2<\/p>\n
Mg Produced a bright white flame and sparks<\/p>\n
Al The aluminum turned bight orange and produced an orange flame<\/p>\n
Si No reaction observed<\/p>\n
Part 4<\/p>\n
Metallic<\/p>\n
substances<\/p>\n
Observations during and after reaction with aqueous HCl<\/p>\n
Mg Immediately bubbled. Condensation and steam produced. Test tube was warm<\/p>\n
Al Slow reaction. Solution bubbled and aluminum piece dissolved in solution<\/p>\n
Si No reaction observed<\/p>\n
Discussion:<\/p>\n
In this lab we observed physical and chemical properties. For example, we observed a<\/p>\n
chemical reaction when magnesium was introduced to oxygen. It produced a bright white flame.<\/p>\n
Changes in color are physical changes like when AgNO3 was introduced to NaI.<\/p>\n
Conclusion:<\/p>\n
Some chemicals are more reactive than other. We can observe physical and some<\/p>\n
chemical changes when we mixing chemicals together.<\/p>\n
Date Completed & Signature:<\/p>\n
——<\/p>\n
4th pre-lab<\/p>\n
Periodic Trends is a title that has been given to a group of people who<\/p>\n
9th of September, 2018<\/p>\n
N\/A: N\/A: N\/A: N\/A: N\/A<\/p>\n
The goal is to observe chemical properties of elements in periods (rows) and in combinations.<\/p>\n
families\/groups (columns).<\/p>\n
Equations that are balanced:<\/p>\n
Part 1: Alkaline Earth Metal Nitrate Chemical Properties<\/p>\n
MgCO3(s) + 2NaNO3 + Mg(NO3)2(aq) + Na2CO3(aq) (aq)<\/p>\n
CaCO3(s) + 2NaNO3 + Ca(NO3)2(aq) + Na2CO3(aq) (aq)<\/p>\n
Ba(NO3)2(aq) + Na2CO3(aq) \uf0ae BaCO3(s) + 2NaNO3(aq)<\/p>\n
Part 2: Chemical Properties of the Halides<\/p>\n
NaCl(aq) + AgNO3(aq) \uf0ae AgCl(s) + NaNO3(aq)<\/p>\n
NaBr(aq) + AgNO3(aq) \uf0ae AgBr(s) + NaNO3(aq)<\/p>\n
NaI(aq) + AgNO3(aq) \uf0ae AgI(s) + NaNO3(aq)<\/p>\n
Part 3: Reactivity of Third Period Elements with Oxygen<\/p>\n
2 Mg(s) + O2(g) \uf0ae 2 MgO(s)<\/p>\n
4 Al(s) + 3 O2(g) \uf0ae 2 Al2O3(s)<\/p>\n
Si(s) + O2(g) \uf0ae SiO2(s)<\/p>\n
Part 4: Reactivity of Third Period Elements with Hydrochloric Acid<\/p>\n
Mg(s) + 2 HCl(aq) \uf0ae MgCl2(aq) + H2(g)<\/p>\n
2 Al(s) + 6 HCl(aq) \uf0ae 2 AlCl3(aq) + 3 H2(g)<\/p>\n
Si(s) + 4 HCl(aq) \uf0ae SiCl4(aq) + 2 H2(g)<\/p>\n
Table of Chemical and<\/p>\n","protected":false},"excerpt":{"rendered":"
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