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Chemistry test/ Lesson 6

Last updated almost 5 years ago
25 questions
1

Sublimation is the process where a substance changes from the liquid to the gaseous state at a definite temperature. (K)

1

Freezing is the process where a substance changes from the solid to the liquid state at a definite temperature. (K)

1

Condensation is the process where a substance changes from the gaseous state to the liquid state at a definite temperature. (K)

1

Which of the following about sea water is NOT true? (K)

1

A liquid is called volatile if: (K)

1

Which of the following four statements best states how the particles are organized in solid state? (K)

1

At the same temperature, choose which molecules are most likely to have the highest kinetic energy. (K)

1

Inspect the following equation that represents the change of state of a substance, and identify in which changes do the particles gain potential energy. (C)

1

Gases and liquids have different properties. Interpret the following cases and decide which is true. (C)

1

Identify which of the following processes causes the most increase of the distance between the particles? (C)

1

The following statements describe the change in kinetic and potential energies of a substance while changing temperature or state.

I. The kinetic energy and potential energy both increase while the substance melts.
II. The potential energy increases while the kinetic energy stays constant while the substance melts.
III. The kinetic energy increases while the potential energy stays constant when the temperature of the substance increases.
IV. The kinetic energy and potential energy both increase when the temperature of the substance increases.

Tell which of the above statement(s) is / are true? (C)

1

Based on the definition of a solution, decide which of the following is Not a solution. (Ap)

1

The following figure represents a cup of hot coffee. How can the particles of the hot coffee be compared to the particles of air above it? (Ap)

1

Inspect the following diagrams and identify which best represents an alloy of copper and zinc knowing that they have the same atomic radius. Type the letter that corresponds to the correct diagram below. (An)





For questions 15-19 use the following diagrams that represent particulate representations of elements compounds and mixtures and choose from below which substance can be represented by each diagram. (An)

Ne gas
H2O gas
N2 gas
A gaseous mixture of Ne and N2
A gaseous mixture of Ne and Xe
A gaseous mixture of N2, Ne and Xe
A gaseous mixture of Ne and H2O and N2
An alloy

1

Diagram a represents:

1

Diagram b represents:

1

Diagram c represents:

1

Diagram d represents:

1

Diagram e represents:

For questions 20-24 use the diagram below that shows the heating curve of 100g substance X.
1

What is the boiling point of the substance? (An)

1

At what instant does the melting process start? (An)

1

How long did the vaporization process take? (An)

1

What is (are) the state(s) of the substance through the section [CD] of the graph

1

On the same graph, sketch the heating curve of a 200 g sample of the same substance between 110oC and 130oC. (Syn)

1

A student was handed an unknown homogeneuos solution to test its purity. He measured the boiling point of the substance he found that the substance started boiling at 100oC and the temperature kept rising till 120oC. The student claimed that the substance is pure water.
Which of the following best evaluates and justifies the student’s claim? (Ev)