1.2 Scientific Investigation in Chemistry

1.2 Scientific Investigation in Chemistry - Set 1

Report 1 / 5

The diagram shows the some of the steps in scientific investigation.

What is X?

Forming hypothesis
Planning the experiment
Controlling the variables
Collecting data

Difficulty Level: Medium

1.2 Scientific Investigation in Chemistry - Set 1

Report 2 / 5

Fill in the blank with suitble word.

Making \(\underline{\qquad\,\,\,\,}\) is a process of forming an early logical conclusion, which may or may not be true to explain a process or observation.

Variables
Inference
Hypothesis
Conclusion

Difficulty Level: Hard

1.2 Scientific Investigation in Chemistry - Set 1

Report 3 / 5

The diagram shows two beakers containing water of different temperatures and the same amount of salt.

The experiment is to study the effect of the temperature of the water on the rate of salt dissolving.

Beaker 1 has water of \(90\,^OC\) while Beaker 2 has water of \(30\,^OC\).

Which of the following is not the constant variable for this experiment?

Volume of water
Mass of salt
Temperature of water
Size of salt

Difficulty Level: Medium

1.2 Scientific Investigation in Chemistry - Set 1

Report 4 / 5

X is a factor that is changed or manipulated during the investigation

Based on the statement, which of the following is X?

Hypothesis
Manipulated variable
Constant variable
Conclusion

Difficulty Level: Easy

1.2 Scientific Investigation in Chemistry - Set 1

Report 5 / 5

Water temperature (°C)	Time taken for table salt to dissolve (s)
30	30
80	17
95	7

The table illustrates the result of dissolving \(5\,\text{g}\) of table salt in three different beaker containing water of different temperatures.

Based on the result, what can be concluded?

As the water temperature increases, the time taken for table salt to dissolve increases
As the water temperature increases, the time taken for table salt to dissolve decreases
The increase in water temperature has no effect on the time taken for table salt to dissolve
The time taken for table salt to dissolve has affected the water temperature.

Difficulty Level: Easy