Particulate Nature of Matter & Chemical Changes

The three states of matter are represented by diagrams X, Y and Z. Which change occurs during condensation?

The particles of liquids ________________

The changes that occur when a substance changes state are shown below.

Which process, W, X, Y or Z, is occurring in the following four situations?

1 Butter melts on a warm day.

2 Water condenses on a cold surface.

3 The volume of liquid ethanol in an open beaker reduces.

4 Ice forms inside a freezer

How many changes of state occur in this graph?

Use the diagram to answer the question. Julian removes boiling water from a heat source and places it in a freezer. He then records the water’s temperature as it freezes. The diagram represents the data recorded.

Which segment of the diagram shows where the molecules of water will have the least energy?

A green powder is heated & a gas is given off while it turns to a black solid. This describes

A molecule is created when the same _________ is bonded together. For example: C₁₀

Which of the following is a heterogeneous mixture?

What type of mixture would fruit salad be?

What type of mixture would coffee be?

What is the percentage atom economy for the formation of ethane in the reaction below?

Calculate the % atom economy of 2KClO₃ → 2KCl + 3O₂

using the given relative atomic masses: O = 16, K = 39, Cl = 35