Lab Skills

Question 1

In an investigation for determining the effect of temperature on the rate of reaction, why is it important to control the mass of the substances?

Answer 1

Because mass is a controlled variable in this experiment, which is a factor other than temperature that can affect the rate of reaction.

Question 2

What is independent variable?

Answer 2

a variable that stands alone and isn’t changed by the other variables you are trying to measure
ex: it was the surface area of calcium carbonate.

Question 3

what is dependent variable?

Answer 3

The dependent variable is the effect. Its value depends on changes in the independent variable.
ex: time taken for the calcium carbonate to react with hydrochloric acid.

Question 4

what is control variable?

Answer 4

a variable or an element that is held constant throughout an experiment or research in order to assess the relationship between multiple variables.
ex:
Amount of Hydrochloric acid (25ml each trial)
The concentration of Hydrochloric acid
The water inside the Measuring Cylinder (100ml each trial)

Question 5

what is the use of a graph in the lab report?

Answer 5

The graph can demonstrate the relationship or lack of relationship between variables and quantities.

Question 6

what are the different types of graphs?

Answer 6

Bar Graph.
Segmented Bar Graph.
Column Graph.
Box and Whiskers Graph (also called a Box Plot)
Frequency Graph (Frequency Table)
Cumulative Frequency Table.
Frequency Polygon.
Histogram.

but usually bar, line, and scatter plots are also used in lab reports