Podcast
Questions and Answers
What is the aim of the experiment described?
What is the aim of the experiment described?
The thermometer should touch the boiling tube to ensure accurate readings.
The thermometer should touch the boiling tube to ensure accurate readings.
False
What is the independent variable in the experiment?
What is the independent variable in the experiment?
The type of food
The dependent variable in the experiment is the amount of energy stored in the __________.
The dependent variable in the experiment is the amount of energy stored in the __________.
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Which of the following is NOT a controlled variable in the experiment?
Which of the following is NOT a controlled variable in the experiment?
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Name one safety precaution that must be observed during the experiment.
Name one safety precaution that must be observed during the experiment.
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Match the apparatus with their purposes:
Match the apparatus with their purposes:
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It is important to maintain the same __________ of foods being burnt in the experiment.
It is important to maintain the same __________ of foods being burnt in the experiment.
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Which activity is NOT an observation in the laboratory?
Which activity is NOT an observation in the laboratory?
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A glowing splint relights in the presence of carbon dioxide.
A glowing splint relights in the presence of carbon dioxide.
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List three aspects considered unsafe in the laboratory as observed in the diagram.
List three aspects considered unsafe in the laboratory as observed in the diagram.
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The test for carbon dioxide involves passing it through limewater, which changes from ______ to milky.
The test for carbon dioxide involves passing it through limewater, which changes from ______ to milky.
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Match the gas with its corresponding test result:
Match the gas with its corresponding test result:
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Which gases are present in the gas sample if the results showed dry cobalt chloride paper turning pink, hydrogencarbonate indicator turning yellow, and glowing splint goes out?
Which gases are present in the gas sample if the results showed dry cobalt chloride paper turning pink, hydrogencarbonate indicator turning yellow, and glowing splint goes out?
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The solution for hydrogencarbonate indicator turns red to yellow in the presence of carbon dioxide.
The solution for hydrogencarbonate indicator turns red to yellow in the presence of carbon dioxide.
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Anhydrous copper(II) sulphate turns from white to ______ when it comes into contact with water vapour.
Anhydrous copper(II) sulphate turns from white to ______ when it comes into contact with water vapour.
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Which process occurs when new substances such as glucose and oxygen are formed?
Which process occurs when new substances such as glucose and oxygen are formed?
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Boiling water is a chemical change.
Boiling water is a chemical change.
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What gas is produced during respiration?
What gas is produced during respiration?
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Photosynthesis occurs in the presence of __________.
Photosynthesis occurs in the presence of __________.
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Match the following tubes with the correct photosynthesis and respiration activity:
Match the following tubes with the correct photosynthesis and respiration activity:
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Which of the following processes is a physical change?
Which of the following processes is a physical change?
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What color does the hydrogencarbonate indicator turn in a tube with pond weed in bright light?
What color does the hydrogencarbonate indicator turn in a tube with pond weed in bright light?
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Magnesium oxide is formed as a product when magnesium burns in the presence of flame.
Magnesium oxide is formed as a product when magnesium burns in the presence of flame.
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Fresh water shrimp can perform photosynthesis in the dark.
Fresh water shrimp can perform photosynthesis in the dark.
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What is the observable change when water is added to a test tube initially containing a white substance?
What is the observable change when water is added to a test tube initially containing a white substance?
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What color will the hydrogencarbonate indicator turn in a tube containing fresh water shrimp in the dark?
What color will the hydrogencarbonate indicator turn in a tube containing fresh water shrimp in the dark?
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When a glowing splint relights in oxygen gas, it signifies a __________ change.
When a glowing splint relights in oxygen gas, it signifies a __________ change.
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Which of the following is NOT considered a physical property of carbon?
Which of the following is NOT considered a physical property of carbon?
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A white solid is formed when magnesium ribbon burns, indicating a physical change.
A white solid is formed when magnesium ribbon burns, indicating a physical change.
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What is the process called when you add more water to a test tube and stir until an observable change occurs?
What is the process called when you add more water to a test tube and stir until an observable change occurs?
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Match the following actions with the type of change they represent:
Match the following actions with the type of change they represent:
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Which structure is responsible for gas exchange in the lungs?
Which structure is responsible for gas exchange in the lungs?
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The ribcage provides mobility and flexibility during the process of gas exchange.
The ribcage provides mobility and flexibility during the process of gas exchange.
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What is the primary role of goblet cells in the gas exchange system?
What is the primary role of goblet cells in the gas exchange system?
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The _____ allows air to pass into both lungs.
The _____ allows air to pass into both lungs.
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Match the following structures with their functions:
Match the following structures with their functions:
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During inhalation, which of the following muscles contracts to lower the ribcage?
During inhalation, which of the following muscles contracts to lower the ribcage?
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Describe how oxygen molecules move from the alveoli into the blood.
Describe how oxygen molecules move from the alveoli into the blood.
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Ciliated cells help trap mucus and forward it toward the lungs.
Ciliated cells help trap mucus and forward it toward the lungs.
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What is the resistance of bulb X?
What is the resistance of bulb X?
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If two identical bulbs are connected in series, the current in the circuit increases.
If two identical bulbs are connected in series, the current in the circuit increases.
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What is the ammeter reading when the switch is closed with only bulb X connected?
What is the ammeter reading when the switch is closed with only bulb X connected?
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The voltmeter reading across bulb X with only one bulb connected is _____ V.
The voltmeter reading across bulb X with only one bulb connected is _____ V.
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How does adding an additional identical bulb in series affect the brightness of bulb X?
How does adding an additional identical bulb in series affect the brightness of bulb X?
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Match the voltage readings with their corresponding circuits:
Match the voltage readings with their corresponding circuits:
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The voltage across bulb X remains the same whether one bulb or two bulbs are connected in series.
The voltage across bulb X remains the same whether one bulb or two bulbs are connected in series.
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Connecting one more bulb in _____ increases the total resistance in the circuit.
Connecting one more bulb in _____ increases the total resistance in the circuit.
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Study Notes
Grade 8 Integrated Science
- This is a science journal for Grade 8 students.
- The journal covers the academic year 2024-2025.
- The book is titled Book 2A.
- The school is the Hong Kong Baptist University Affiliated School, Wong Kam Fai Secondary and Primary School.
Goal Setting
- Students are encouraged to set SMART goals for their science studies.
- SMART goals stand for Specific, Measurable, Achievable, Relevant and Time-bound.
- Students should define their specific goals for improving their understanding of scientific knowledge and science process skills.
- Students should track their progress by selecting methods that help them understand and revise the topics including reviewing notes, completing assignments, making concept maps and actively participating in experiments.
- Students should complete their goals by the end of the first term.
Laboratory Safety
- Hazard warning labels are used to indicate the potential dangers of chemicals.
- Examples of labels include: Explosive, Oxidizing, Flammable, Toxic, Corrosive, Irritant, Harmful, Carcinogenic.
- Students should use the correct method for disposing chemical waste and putting extra solutions and solids into the correct waste containers.
- Experiments that produce dangerous substances require fume cupboards to prevent the release of harmful fumes
- Students should wear safety glasses when working with a Bunsen burner
- The Bunsen burner should be turned off when not in use.
- Materials should be returned to the correct containers when finished with.
- All accidents should be reported to the teacher immediately.
Summary of Tests of Gases
- This section provides the results of gas tests.
- Gases, such as oxygen and carbon dioxide, were tested.
- Specific tests and observations are included for each gas.
Test of Gases (Unknown Sample)
- Based on the results of the tests performed on an unknown gas sample, the presence of the following gases are identified: Oxygen and Carbon Dioxide. Water Vapor wasn't identified.
Photosynthesis and Respiration
- A diagram and table summarizing the relationship between photosynthesis and respiration.
- Photosynthesis takes place in plants only and converts light energy to chemical energy in food.
- Respiration takes place in both plants and animals, releasing chemical energy for other processes.
Starch Test
- Steps involved in a starch test and the purpose of each step.
- The purpose of soaking the leaves with ethanol is to dissolve chlorophyll.
- The use of iodine solution is mentioned, and the method of observing color change identifies if starch is present.
- The result of a starch test includes Iodine solution turning from brown to blue-black if starch is present.
Carbon Dioxide is needed for Photosynthesis
- Experiment designed to show that carbon dioxide is required for photosynthesis to produce starch.
- Independent variable is the presence or absence of carbon dioxide in two sets of identical plants.
- Plants were kept in sealed containers, one with potassium hydroxide (to remove carbon dioxide) and one with glass beads.
- A leaf from each plant was tested for starch.
Physical and Chemical Changes
- Changes to a piece of paper are categorized into physical and chemical.
- Cutting a piece of paper is a physical change.
- Burning a piece of paper is a chemical change.
- Examples of physical changes include changes in state and dissolving.
- Examples of chemical changes include burning of fuels, reactions between metals and acids and rusting of iron.
Usage of Ammeter and Voltmeter
- An ammeter measures current.
- A voltmeter measures voltage.
- Instructions show students how to use these devices correctly when measuring current in a circuit.
Series and Parallel Circuits
- Concepts related to Series and Parallel circuits are explained.
- How to determine the brightness of bulbs in series and parallel circuits.
- How the arrangement of bulbs affects the brightness and the amount of current.
- Students are guided to determine how the current and voltage changes if devices are connected in series and parallel.
Gas Exchange in Plants and Animals
- Describes how gas exchange surfaces are structured.
- Factors that enhance gas exchange: large surface area, thin surface, good blood supply, and good ventilation.
- Explains the function of structures such as: larynx, trachea, bronchi, bronchioles, alveoli, ribs, intercostal muscles and diaphragm.
- Describes how the air sacs are adapted for rapid diffusion of gases.
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Description
This quiz covers essential topics from the Grade 8 Integrated Science journal for the academic year 2024-2025, focusing on goal setting and laboratory safety. Students will learn about setting SMART goals to enhance their understanding of science and the importance of safety in the lab. Engage in important science process skills while tracking your progress!
