Answer:
1) Time (number of days)
2) Mass of container and water
3) Temperature. Humidity.
4) See below
5) See below
6) See below
Explanation:
Question 1
In an experiment, the independent variable is the factor that the researcher manipulates or changes deliberately to observe its effect on the dependent variable. Therefore, the independent variable would be time (number of days) since filling the containers with water.
Question 2
The dependent variable is the outcome or response that is measured as a result of changes in the independent variable. Therefore, the dependent variable would be the mass of container and water.
Question 3
Control variables are the factors in an experiment that are kept constant or unchanged throughout the study to ensure that the effects observed on the dependent variable are solely due to changes in the independent variable and not influenced by other variables. Therefore, two control variables could be temperature and humidity of the room.
Maintaining a constant room temperature ensures that temperature variations do not affect the rate of water evaporation. Keeping the humidity level constant helps ensure that variations in humidity do not influence the rate of water evaporation from the containers.
Question 4
An appropriate investigative question could be:
"How does the mass of water in plastic containers, initially half-filled, change over a period of time when measured at consistent 24-hour intervals?"
Question 5
The aim of this experiment is to examine how the mass of water in plastic containers, initially half-filled, changes over a six-day period when measured at consistent 24-hour intervals. The experiment seeks to investigate the process of evaporation and its effects on the mass of water in the containers over time.
Question 6
It is hypothesized that over the six-day period, the mass of water in the plastic containers will gradually decrease due to evaporation. Containers with larger base areas are expected to experience greater evaporation rates compared to those with smaller areas due to the increased exposure of water molecules to the surrounding air. Consequently, larger containers are anticipated to exhibit more significant reductions in water mass each day compared to smaller containers.
