Experiment 5 Pre-Lab Questions 1. Describe the technique for testing the odor of

Question

Experiment 5 Pre-Lab Questions 1. Describe the technique for testing the odor of a gas. What precautions must be taken why? 2. Fill in the blanks: No color change is observed. It is thern A gas is tested with moist red litmus paper. tested with moist blue litmus paper. The paper turns red. The gas is ° Another gas is tested the same way. The gas did not change the color of either the red or blue litmus paper. The gas is The following reagents were used to produce various nonmetal species. Identify the likely species prepared. Indicate whether it is an element, oxide or hydride. 3. Sodium carbonate Ammonium chloride Potassium iodide Thioacetamide Hydrogen peroxide 4. An unknown substance in aqueous solution is treated with various reagents including hexane, a colorless liquid less dense than water. The test tube is stoppered and shaken. The upper layer remains colorless. Name two nonmetal species that can not be present in the unknown. Explain your answer 5. An unknown substance in aqueous solution is treated with various reagents. A strong degree of effervescence is observed. Identify the non-metal species may have been formed. Write an equation for one of the reactions that would produce the effervescence.

Explanation / Answer

Answer:

1) => Proper way to smell a chemical is to waft your hand above the container towards your face.

=> Never smell or sniff a chemical straight on with your nose. Hazardous chemicals can burn your nose and lungs.

=> So just waft the air up towards your face to smell a chemical.

=> When it is necessary to smell chemicals in the lab, the proper technique is to cup your hand above the container and waft the air toward your face.

=> Try not to breathe in the air through your nose, but bring in just enough to make sense of the smell—much like the approach you would take when someone asks you to do a breath check or when you're debating eating dairy beyond its expiry date.

2) => If the gas is tested with blue litmus paper and it turns to red means the gas is acidic. On the other hand if gas is tested with red litmus and changes to blue the gas is basic.

=> If the gas did not change the colour with either red or blue, then the gas is neutral.

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