Adaptive Practice
Atoms and Molecules
11 questions • Earn up to 118 XP • First attempt — go for 100%!
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Question 1 of 11
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Easy
What is the smallest unit of an element that can exist either alone or in combination?
Easy
Which of the following represents a molecule?
Easy
What is the chemical formula of water?
Medium
Which of the following statements is true about molecules?
Medium
What is the total number of atoms in 2 molecules of CO2?
Medium
Which of the following is a compound?
Medium
What is the ratio of atoms in a molecule of ammonia (NH3)?
Hard
Which scientist proposed the indivisible particle called 'atom'?
Hard
If 1 mole of methane (CH4) contains 6.022 × 10^23 molecules, how many hydrogen atoms are there in 1 mole of methane?
Easy
Which of the following represents a mixture, not a compound?
Hard
In the reaction 2H2 + O2 → 2H2O, how many molecules of water are formed when 4 molecules of hydrogen react completely with oxygen?