Question

In an experiment, two flasks of unknown, clear liquids are combined in a beaker and the following observations are made:

Solution color remains clear
The solution gave off a smell of sulfur.
Solution temperature changed from 10oC to 20oC.
Some of the liquid remained in the flasks.
Which of these statements indicate a new substance was formed? (HINT: there is more than one correct answer; select all correct answers)

Answer 1

In the experiment, the temperature increase and the emergence of a sulfur smell both indicate that a chemical reaction took place, forming a new substance.

• The solution gave off a smell of sulfur.
• Solution temperature changed from 10oC to 20oC.

Step-by-step explanation:

The observations that indicate a new substance was formed during the experiment are the temperature change from 10°C to 20°C and the detection of a sulfur smell.

These are both classic signs of a chemical reaction. An increase in temperature without applying heat externally suggests an exothermic reaction, where the reactants release energy as they form new products. The emission of a sulfur smell suggests that the new substance has different properties (olfactory properties, in this case) from the reactants, which is a strong indication that a chemical change has occurred.

Answer 2

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