Professional Courses
Industry-relevant training in Business, Technology, and Design to help professionals and graduates upskill for real-world careers.
Categories
Interactive Games
Fun, engaging games to boost memory, math fluency, typing speed, and English skills—perfect for learners of all ages.
Typing
Memory
Math
English Adventures
Knowledge
Enroll to start learning
You’ve not yet enrolled in this course. Please enroll for free to listen to audio lessons, classroom podcasts and take practice test.
Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
Define a surrogate in environmental analysis.
💡 Hint: Think about how it helps in measuring other substances.
Question 2
Easy
What is the purpose of calibration?
💡 Hint: Consider what we need to measure our samples accurately.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is the purpose of adding a surrogate?
- To change the analyte
- To check extraction efficiency
- To dilute the sample
💡 Hint: Recall the role of the surrogate.
Question 2
True or False: The recovery rate should always be lower than the added amount.
- True
- False
💡 Hint: Think about what recovery means.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
You added 150 micrograms of surrogate and recovered 15 micrograms after analysis. What is the recovery rate?
💡 Hint: Use the recovery calculation formula.
Question 2
If your unknown sample yields a response of 240,000 and the calibration response equation is 60,000m, what is the mass of the analyte?
💡 Hint: Utilize the calibration equation for the calculation.
Challenge and get performance evaluation