IB Chemistry HL Structure 1: Models of the particulate nature of matter questions

Exam-style multiple choice and written questions with full markschemes. Check multiple choice answers straight away, or type, photograph or draw a written answer and get it marked.

Type
Multiple choiceWritten
Difficulty
EasyMediumHard

Question 1

Multiple choiceEasy1 mark

Two samples of the same gas are at 20.0 °C and 40.0 °C. Which value is closest to the ratio of the average kinetic energy per particle at 40.0 °C to that at 20.0 °C?

Show answer and explanation

Answer: C. For the same gas, average kinetic energy per particle is proportional to temperature in kelvin. Converting gives 293.15 K and 313.15 K, so the ratio is 313.15/293.15 = 1.07.

A: calculates the fractional increase, 20/293.15 ≈ 0.07, rather than the final ratio.
B: reverses the ratio, using 293.15/313.15 ≈ 0.94.
D: uses the Celsius readings directly, giving 40.0/20.0 = 2.00.

Remember: use kelvin values when forming a ratio of temperatures.

The best questions are still waiting

Unlock every question in this topic, then type, photograph or draw your answer and have it marked against the markscheme. Find out where you are dropping marks.

Unlock all questionsCompare Student and Student Plus