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
How many hydrogen atoms are in H₂O?
💡 Hint: Look at the subscript after 'H'.
Question 2
Easy
What is the total number of atoms in CO₂?
💡 Hint: Add the number of each type of atom.
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 does a subscript indicate in a chemical formula?
- Number of elements
- Number of atoms of an element
- Overall molecular weight
💡 Hint: Think about how many hydrogens are in H₂O.
Question 2
True or False: Parentheses in chemical formulas do not affect the count of atoms.
- True
- False
💡 Hint: Consider how (OH)₂ means two groups of two atoms.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
For the complex molecule As₂(SO₄)₃, calculate the total number of atoms present.
💡 Hint: Break down the compound into parts, count, and then sum them up.
Question 2
Determine the total number of atoms in an aqueous solution of C₁₀H₁₈N₂O₄.
💡 Hint: Count through each type carefully; they're all present in the formula!
Challenge and get performance evaluation