Get premium membership and access questions with answers, video lessons as well as revision papers.

In a class experiment, the following instructions were given. 1. Put some benzoic acid in a test tube 2. Add a reasonable amount of NaCl solution into...

In a class experiment, the following instructions were given.
1. Put some benzoic acid in a test tube
2. Add a reasonable amount of NaCl solution into test-tube containing benzoic acid and shake
vigorously
3. If no change takes place heat the mixture gently
4. Repeat the experiment using H2O, propane, methyl benzene; sucrose and ethanol in each case
record your observations.

I. Each instruction 1 and 2 is imprecise. Identify the problem inherent in each of the instructions and
write it in precise form.

Answers

A. Instruction 1; Put some benzoic acid in a test tube
PROBLEM
- the word “some” is not specific enough
SOLUTION
- should use a specific amount like 2ml

CORRECT STATEMENT
Put 2ml of benzoic acid in a test tube

B. Instruction 2; Add a reasonable amount of NaCl solution into test-tube containing benzoic
acid and shake vigorously

PROBLEM
The words “reasonable amounts” are not specific

SOLUTION
Should use specific amount like 5 ml or 3 droplets

CORRECT STATEMENT
Add a reasonable amount of NaCl solution into test-tube containing benzoic acid and shake vigorously

Put 2ml of benzoic acid in to a test tube

---

Titany answered the question on January 5, 2022 at 09:15

Next: Discuss reasons that justify doing experiments with students in secondary school
Previous: Discuss 5 safety equipment put in a laboratory

View More Subject Methods Chemistry Questions and Answers | Return to Questions Index

Related Questions

• Discuss reasons that justify doing experiments with students in secondary school(Solved)
  

  Discuss reasons that justify doing experiments with students in secondary school

  Date posted: January 5, 2022.  Answers (1)

• Suggest three reasons why chemistry textbooks author abroad may not be appropriate for use in the secondary school in Kenya(Solved)
  

  Suggest three reasons why chemistry textbooks author abroad may not be appropriate for use in
  the secondary school in Kenya

  Date posted: January 5, 2022.  Answers (1)

• Outline three scientific attitudes developed by learning chemistry in secondary schools(Solved)
  

  Outline three scientific attitudes developed by learning chemistry in secondary schools

  Date posted: January 5, 2022.  Answers (1)

• List any objectives of teaching chemistry in secondary school in Kenya(Solved)
  

  List any objectives of teaching chemistry in secondary school in Kenya

  Date posted: January 5, 2022.  Answers (1)