Annie Termaat and Christopher Talbot Solutions for Chapter: What is Matter?, Exercise 23: SOME SUMMATIVE PROBLEMS TO TRY

Outline reasons for standardising conditions in which chemists describe matter.

A student mixed $500 {\mathrm{cm}}^3$ each of two pure liquids, isopropyl alcohol (propan-2-ol) and water. Apply your knowledge and understanding about matter to explain why the total volume of the mixed liquid is less than $1000 {\mathrm{cm}}^3$.

Your little sister left her balloon in the back seat of a hot car. You return to the car with her after visiting a shopping mall for a few hours and notice the balloon seems a lot bigger. Interpret this observation with a scientifically supported judgement about how this may have been caused?

Dalton's atomic theory included (a) elements (b) atoms, (c) compounds and ideas about (d) states of matter: solids, liquids and gases.

Briefly describe these terms, using diagrams if necessary.

A grain of sand can be assumed to be a sphere of diameter ${10}^{-4} \mathrm{m}$. It can be assumed that the particles making the sand grain are ${10}^{-10} \mathrm{m}$ in diameter. Estimate the number of atoms in the grain of sand. Express your answer using scientific notation.

The table below shows some physical properties of familiar, everyday substances.

Analyse the information to make scientifically supported judgements about which of these materials is likely to be chemically pure.

Explain using examples about the nature of matter, the limitations of developing scientific knowledge by argument and discussion alone.

Analyse and evaluate the observations below to determine whether the changes described are likely to involve the formation of new combinations of matter, or are physical changes.