Chemistry Lab Answers

by Liz LaRosa

www.middleschoolscience.com

 

Rainbow Lab Table 1:

Test Tube

Color of Liquid

Total Amount of Liquid (mL)

A

Red

10

B

Orange

11

C

Yellow

10

D

Green

11

E

Blue

10

F

Purple

11

 

Mystery Powder Lab:

Table 1 : Results of Tests on Powders

NOTE: The only correct answers on the flow chart are : gelatin, baking soda, salt, corn starch, & baking powder- the others are wrong answers placed to check student progress on flow chart usage.

Test A Gelatin (Knox) B Baking Soda C Salt D Corn Starch E Baking Powder
Color Ivory White   White   White White
Texture any any any any any
Crystal / Powder Crystal Powder Crystal Powder Powder
pH Can be Slightly Acidic Base Neutral Neutral Neutral
Biuret Purple Blue Blue Blue Blue
Vinegar No Yes No No Yes
Iodine No No No Black Black

 

Balancing Equations Lab:

Table 1 :   Chemical Equations 

Make the following Equations on your desk Reactants  Products Reactants - Final Products - Final Balanced Equation
H2 + O2 --> H2O 2  hydrogen

2 oxygen

 2  hydrogen

1 oxygen 

  4 hydrogen

2 oxygen 

  same as final  reactants 2 H2 + O2 --> 2 H2O
H2O2 --> H20 + O2 2 hydrogen

2 oxygen

  2 hydrogen

3 oxygen

   4 hydrogen

4 oxygen

  same as final  reactants  2 H2O2 --> 2 H20 + O2
Na + O2 --> Na2O  1 sodium

2 oxygen

  2 sodium

1 oxygen

  4 sodium

2 oxygen 

  same as final  reactants  4Na + O2 --> 2 Na2O
N2 + H2 --> NH3 2 nitrogen

2 hydrogen

 1 nitrogen

3 hydrogen

 2 nitrogen

6 hydrogen 

  same as final  reactants  N2 + 3H2 --> 2 NH3
P4 + O2 --> P4O10  4 phosphorus

2 oxygen

 4 phosphorus

10 oxygen

 4 phosphorus

10 oxygen 

  same as final  reactants  P4 + 5O2 --> P4O10
Fe + H2O --> Fe3O4 + H2  1 iron

2 hydrogen

1 oxygen

  3 iron

 2 hydrogen

4 oxygen

 3  iron

8 hydrogen

4 oxygen 

  same as final  reactants  3Fe + 4H2O --> Fe3O4 + 4H2
C + H2 --> CH4  1 carbon

2 hydrogen

 1 carbon

4 hydrogen

  1 carbon

4 hydrogen 

  same as final  reactants  C + 2 H2 --> CH4
Na2SO4 + CaCl2 --> 

CaSO4 + NaCl

 2sodium

1 sulfur

4 oxygen

 1 calcium 

2 chlorine

 1 sodium

 1 sulfur

4 oxygen

1 calcium 

1 chlorine

 2 sodium

1 sulfur

4 oxygen

1 calcium  

2 chlorine

  same as final  reactants Na2SO4 + CaCl2 --> 

CaSO4 + 2 NaCl 
C2H6 + O2 --> CO2 + H2O  2 carbon

6 hydrogen

2 oxygen

 1 carbon

2 hydrogen

3 oxygen

 4 carbon

12 hydrogen

14 oxygen 

  same as final  reactants  2 C2H6 + 7O2 --> 4CO2 + 6H2O
Al2O3 --> Al + O2 2 aluminum

3 oxygen

 1 aluminum

2 oxygen

  4 aluminum

6 oxygen

  same as final  reactants   2 Al2O3 --> 4Al + 3O2