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Lab2-Chem

In: Science

Submitted By lynzielove
Words 366
Pages 2
LAB REPORT CH-114A

Experiment: Properties of gases.

Objectives: The objective of the experiment is to see the physical and chemical properties of gases and how to identify the gases when you have to encounter them.

OBSERVATIONS:
The things I observed during this experiment were bubbles and color change.

DATA:
Gas
Flame reaction
Glowing splint
Limewater reaction
Brothothymol blue reaction
Hydrogen:
Flame got bigger with popping
Flame went out
Light brown color
Green color
Oxygen:
Flame lit up quickly
Reignited
Color red
Color blue
Hydrogen and Oxygen:
No reaction
Flame went out
Brown color
Greenish blueish color
Carbon dioxid-
No flame
No flame
Bubbles and then it turns cloudy
Bubbles and then it turns yellow
Alka Seltzer:
Quickley bubbled
Breath:
No reaction
Quickly bubbles and turns cloudy
No reaction
Turns blue

CALCULATIONS:

CONCLUSION:
In this experiment it made me learn that reactions are way different when you compare them as acidic or basic.

QUESTIONS:
1. Give two reasons why we fill the gas generator test tubes almost to the top with chemicals.
-We want to make sure we minimize the amount of air so the gas will stay pure, also, some gases react differently with air. The less space so it will less likely affect the results.
2 What happens to the zinc in the hydrogen generation experiment?
-The zinc dissolves.
3. What happens to the manganese in the oxygen generation experiment?
-The manganese speeds up the reaction.
4. Write a balanced equations for the reaction between o2 and h2.
-2H2 + O2---2H2O
5. What is the function/purpose of the brothymol blue in the CO2 experiment?
-The bromothymol blue changed from blue to green and then it turned yellow. After the CO2 was mixed with the water carbonic acid was formed. If there is a lot of CO2 present it will turn yellow and if there isn’t it will stay blue, so you could you bromothymol to see if CO2 was present.
6. Bromothymol blue is blue in the presence of a basic solutions, and yellow in the presence of acidic solutions. If your solutions is a murky green, what might you assume the solution?
-It is a mix between acidic and basic solutions.

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