Essential Chemistry Concepts Quiz
Test your knowledge of fundamental chemistry concepts that every science student should know!
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Quiz Questions & Answers
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Question 1: Which electron orbital fills first: 4s or 3d?
3d always fills first
4s fills first
They fill simultaneously
Depends on the element
Question 2: What happens to atomic radius as you move left to right across the periodic table?
It increases
It stays the same
It decreases
It fluctuates randomly
Question 3: If you double the pressure of a gas at constant temperature, what happens to its volume?
It doubles
It halves
It stays the same
It increases by 4 times
Question 4: What's the pH of a 0.01 M HCl solution?
1
2
0.01
3
Question 5: In an exothermic reaction, what happens to the surroundings?
They cool down
Nothing changes
They heat up
They become acidic
Question 6: What's the molarity of a solution containing 2 moles of NaCl in 500 mL of solution?
4 M
1 M
2 M
0.5 M
Question 7: Which factor does NOT affect reaction rate?
Temperature
Concentration
Pressure
Time of day
Question 8: What's the limiting reagent in a reaction?
The reactant you add last
The reactant that runs out first
The most expensive reactant
The fastest-reacting substance