Chapter 27 Multiple choice questions

. Select the qualitative statement from the list below.

The temperature is 30° C.

The second reaction took 30 seconds longer than the first one.

The reading on the burette is 30.2 cm³.

This sample weighs more than the other one.

. Select the quantitative statement from the list below.

We measured the temperature.

The formation enthalpy for this compound is three times larger than the formation enthalpy for the other compound.

The frequency for the peak representing the stretch of a

C = O

group is greater than that for a

C — H

stretch.

Exhibit A is wider than exhibit B.

. This question concerns plotting controlled variables.
Select the correct statement from the list below.

The controlled variable is plotted along the y-axis (or ordinate).

The controlled variable is plotted along the x-axis (or abscissa).

The controlled variable can be plotted along either the x- or the y-axis.

The controlled variable is the one that is observed.

. This question concerns plotting observed variables.
Select the correct statement from the list below.

The observed variable is plotted along the x-axis (or abscissa).

The observed variable can be plotted along either the x- or the y-axis.

The observed variable is the one that is changed in a controlled way.

The observed variable is plotted along the y-axis (or ordinate).

. When plotting a graph of x-y data on a computer using a suitable programme (where x is the controlled variable and y is the observed variable), what type of graph should you select?

Pie

Line

Bar

Scatter

. Which of the following features is NOT recommended when you draw a graph with pencil and paper?

Label each axis of the graph with the corresponding variable and any units.

Make the graph as small as possible.

Give the graph a title explaining which variables have been plotted.

If the graph is linear, then scale the axes so that the line is inclined at close to 45° to both axes.

. In a graph of an observed variable (on the y-axis) against the controlled variable (on the x-axis), the data lies on a straight line. We can therefore conclude that

the observed variable (y) is independent of the controlled (x) variable.

there is a non-linear relationship between the observed (y) and controlled (x) variables.

there is a linear relationship between the observed (y) and controlled (x) variables.

there is an exponential relationship between the observed (y) and controlled (x) variables.

. In a graph of an observed variable (on the y-axis) against the controlled variable (on the x-axis), the data lies on a curved line. We can therefore conclude that

there is a non-linear relationship between the observed (y) and controlled (x) variables.

the observed variable (y) is independent of the controlled (x) variable.

there is a linear relationship between the observed (y) and controlled (x) variables.

there is an exponential relationship between the observed (y) and controlled (x) variables.

. In a graph of an observed variable (on the y-axis) against the controlled variable (on the x-axis), the data lies scattered. We can therefore conclude that

there is a linear relationship between the observed (y) and controlled (x) variables.

there is a non-linear relationship between the observed (y) and controlled (x) variables.

the observed variable (y) is independent of the controlled (x) variable.

the observed variable (y) may either be (i) independent of x or (ii) dependent on not just the controlled (x) variable but on a compound variable (x z), and we should explore both possibilities.

. Select the best definition of a sigmoidal graph.

A graph where two linear regions meet.

A graph in which the data points lie on a curve that never reaches an axis but appears to skim alongside it.

A graph which has an 'S' shape.

A graph in which the data points lie on a straight line.

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