Question

In this activity, you will investigate factors that affect reaction rates. you will carry out this investigation at home, using the list of materials below. question: how does the temperature of water affect the dissolving rate? hypothesis: this is where you will give your thoughts on the question above. what do you think will happen and why? this is an educated guess. include this in your analysis questions using the if….then. (if i change the temperature, then…..) materials: we know that you might have different materials or sizes, if you need help making substitutions reach out to your teacher. 3 cups that are the same (jars, drinking glasses, plastic cups) measuring cup measuring spoon water (cold, room temperature, hot water) salt or sugar spoon or stirring stick timer (from your computer or phone)

a. Dissolving rate will increase with higher temperature because molecules move faster.
b. Dissolving rate will decrease with higher temperature due to decreased molecular movement.
c. Dissolving rate remains constant regardless of water temperature.
d. Dissolving rate will show random fluctuations irrespective of temperature changes.

Answer 1

If the temperature of water is raised, it is expected that the dissolving rate of a solute such as salt or sugar will increase due to the enhanced kinetic energy of water molecules causing more vigorous and frequent collisions.

Step-by-step explanation:

Hypothesis on Temperature and Dissolving Rate

When temperature of a solvent such as water is increased, the molecules within it gain more kinetic energy. This energy causes the water molecules to move more rapidly, collide with solutes like salt or sugar with greater frequency, and with more force. The result of these more energetic collisions is an increased rate of dissolution, meaning that the solute dissolves faster. Therefore, if we apply this knowledge to the hypothesis: If the temperature of water is increased, then the dissolving rate of a solute like sugar or salt will increase, because the higher temperature provides more energy for the molecules to move and interact.

This is further supported by the fact that agitation of the solution, like stirring, increases contact between the solvent and the solute, speeding up the dissolution process. Comparable effects are observed when temperature is increased, as it naturally agitates the molecules within the solvent through their increased motion. Moreover, higher temperature can sometimes increase the solubility of the solute itself, thereby allowing more of the solute to dissolve in the solvent.