SOLUTION: 2 properties of materials grade 8 cambridge - Studypool - Free Printable

The image provided discusses the properties of materials, specifically focusing on solutions. Let's break down the key points and solve the problem step by step.

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Key Concepts from the Image:

1. Definition of a Solution:
- A solution is formed when a solute dissolves in a solvent.
- The mass of the solution is the sum of the masses of the solute and the solvent:
\[
\text{Mass of solution} = \text{Mass of solute} + \text{Mass of solvent}
\]
- No mass is lost during the process; mass is conserved.

2. Types of Solutions:
- Concentrated: Contains more solute.
- Dilute: Contains less solute.
- Saturated: A solution in which no more solute can dissolve at a given temperature.

3. Effect of Temperature on Solubility:
- As the temperature increases, the solubility of most solutes in a solvent increases.

4. Variables Mentioned:
- Independent variable: Temperature
- Dependent variable: Solubility
- Controlled variables: Type of solute and solvent, pressure (if applicable).

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Problem to Solve:

The task appears to involve identifying how temperature affects solubility and understanding the relationship between these variables. Specifically, the question seems to ask about the effect of temperature on solubility and how to control other factors.

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Solution Explanation:

#### Step 1: Understand the Relationship Between Temperature and Solubility
- The image explicitly states that as the temperature increases, the solubility increases. This means that higher temperatures generally allow more solute to dissolve in a given amount of solvent.

#### Step 2: Identify Variables
- Independent Variable: Temperature (this is what you change or control in an experiment).
- Dependent Variable: Solubility (this is what you measure as a result of changing the temperature).
- Controlled Variables: To ensure that the observed changes in solubility are due to temperature alone, other factors such as the type of solute and solvent, and external conditions like pressure, must be kept constant.

#### Step 3: Designing the Experiment
To study the effect of temperature on solubility:
1. Choose a specific solute and solvent (e.g., sugar and water).
2. Measure the solubility of the solute in the solvent at different temperatures (e.g., room temperature, slightly warmer, and much warmer).
3. Keep all other factors constant (type of solute, type of solvent, pressure, etc.) to isolate the effect of temperature.

#### Step 4: Observations and Conclusions
- If the experiment is conducted correctly, you should observe that solubility increases as temperature increases.
- This confirms the general trend stated in the image: solubility is directly proportional to temperature for most solutes.

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Final Answer:

The problem involves understanding how temperature affects solubility and recognizing the roles of independent, dependent, and controlled variables. Based on the information provided:

\[
\boxed{\text{As temperature increases, solubility increases.}}
\]

This relationship can be studied by controlling other variables (like the type of solute and solvent) and measuring solubility at different temperatures.