Question

1. a slender graduated tube used in a lab for measuring and transferring quantities of liquids from one container to another

a. erlenmeyer flask
b. graduated cylinder
c. beaker
d. microscope

1. what does the slope on a distance time graph represent?

a. speed
b. acceleration
c. velocity
d. displacement

1. name two processes that are used to separate mixtures?

a. conductivity and malleability
b. ductility and filtration
c. distillation and filtration
d. viscosity and displacement
short answer
classify the following as a chemical or physical change.

1. baking a cake-
2. cutting your hair-
3. rusting of iron-
4. breaking a bottle-
5. mixing an acid and a base-

Explanation:

Question 28

To determine the correct lab equipment, we analyze each option:

• Option a: Erlenmeyer flask is used for mixing, heating, or storing liquids, not primarily for measuring and transferring.
• Option b: Graduated cylinder is a slender graduated tube designed for measuring and transferring liquid volumes.
• Option c: Beaker is used for holding, mixing, or heating liquids but has less precision in measurement and transfer compared to a graduated cylinder.
• Option d: Microscope is used for viewing small objects, not for liquid measurement/transfer.

In a distance - time graph, the slope is calculated as the change in distance (Δd) divided by the change in time (Δt). The formula for speed is \(v=\frac{d}{t}\) (where \(v\) is speed, \(d\) is distance, and \(t\) is time).

• Option a: Speed is equal to the slope of a distance - time graph.
• Option b: Acceleration is the slope of a velocity - time graph, not a distance - time graph.
• Option c: Velocity is a vector quantity that includes direction, and the slope of a distance - time graph (which uses scalar distance) represents speed (a scalar).
• Option d: Displacement is a vector representing the change in position, and it is not the slope of a distance - time graph.

We need to identify processes for separating mixtures:

• Option a: Conductivity (ability to conduct electricity) and malleability (ability to be hammered into sheets) are physical properties, not separation processes.
• Option b: Ductility (ability to be drawn into wires) is a physical property, while filtration is a separation process. So this option is incorrect.
• Option c: Distillation (separates mixtures based on differences in boiling points) and filtration (separates solids from liquids or gases) are both processes used to separate mixtures.
• Option d: Viscosity (resistance to flow) and displacement (a concept in physics related to volume or position) are not separation processes.

Answer:

b. Graduated cylinder

Question 29