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Questions and Answers
A student notices that plants grow taller when placed near a window. They hypothesize that sunlight affects plant growth. Which variable is the independent variable in this experiment?
A student notices that plants grow taller when placed near a window. They hypothesize that sunlight affects plant growth. Which variable is the independent variable in this experiment?
- The type of plant used
- The height of the plants
- The amount of sunlight (correct)
- The type of soil used
A chemistry student mixes two chemicals in a beaker, and the beaker becomes very hot. Which hazard symbol would be MOST appropriate to display on the beaker?
A chemistry student mixes two chemicals in a beaker, and the beaker becomes very hot. Which hazard symbol would be MOST appropriate to display on the beaker?
- An exploding bomb
- A flame (correct)
- A skull and crossbones
- A corrosive material symbol
Why is it important NOT to dispose of certain chemicals down the sink in a school laboratory?
Why is it important NOT to dispose of certain chemicals down the sink in a school laboratory?
- To prevent damage to the sink material from corrosive substances.
- To avoid unexpected reactions with other chemicals already in the plumbing system.
- To protect the environment and prevent water contamination.
- All of the above. (correct)
A student conducts an experiment to see how temperature affects the rate at which sugar dissolves in water. They keep the volume of water and the amount of sugar constant. What is the primary purpose of keeping these variables constant?
A student conducts an experiment to see how temperature affects the rate at which sugar dissolves in water. They keep the volume of water and the amount of sugar constant. What is the primary purpose of keeping these variables constant?
A graph shows a straight line passing through the origin, with the y-axis representing distance and the x-axis representing time. What kind of relationship does this graph indicate between distance and time?
A graph shows a straight line passing through the origin, with the y-axis representing distance and the x-axis representing time. What kind of relationship does this graph indicate between distance and time?
Flashcards
Hazard Symbol
Hazard Symbol
A symbol that warns of a dangerous substance or situation.
Logbook
Logbook
A written record of experiments, including procedures, data, and observations.
Independent Variable
Independent Variable
The variable that is changed/manipulated in an experiment.
Hypothesis
Hypothesis
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Fair Test
Fair Test
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Study Notes
- Hazard symbols are used to identify potential dangers.
- Laboratory safety protocols are put in place to maintain a safe working environment.
- Logbooks are used to record experimental procedures, observations, and data.
- A logbook should contain details of the experiment, data, date and time.
Variables in experiment
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Independent variable: the one you change.
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Dependent variable: the one you measure.
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Control variable: stays the same.
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Graphs are use to display data.
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An aim is the purpose of an experiment.
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A hypothesis is a testable explanation for a phenomenon.
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An experimental report should include the aim, method, results, and conclusion.
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A fair test is one in which only the independent variable is changed and all other variables are controlled.
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Chemicals must be disposed of properly to avoid environmental contamination and health hazards.
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Chemicals should not go down the sink, because they could cause pollution, damage pipes or react in dangerous ways.
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Correlation indicates a relationship between two variables, while causation means that one variable directly affects another.
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Minimising experimental errors improves the accuracy and reliability of results.
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Data analysis involves interpreting data presented in tables and graphs.
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Direct proportion occurs when two variables increase or decrease together at a constant rate, represented as a straight line on a graph.
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Inverse proportion exists when one variable increases as the other decreases, and vice versa, resulting in a curved line on a graph.
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