Biology
Chemistry
Electricity
Earth and Space
100
What term describes a community of living organisms interacting with their physical environment?
Ecosystem!
An ecosystem is a community or group of living organisms that live in and interact with each other in a specific environment
100
What is the difference between a physical change and a chemical change?
A physical change changes the form/state but not the substance while a chemical change creates new substances
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100
What do we call the flow of electric charge through a conductor?
Electric CURRENT
Electric current refers to the amount of electricity flowing through a circuit.
100
Which planet is known as the Red Planet?
Mars is called the Red Planet because its surface is covered in iron oxide (rust), which gives it a distinctive reddish-orange color visible from Earth.
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200
What do we call a relationship between two organisms living closely together where each benefits?
a) Mutualism
b) Commensalism
c) Parasitism
d) Competition
Mutualism!
200
What is the difference between an element and a molecule? Provide an example of each!
An element is a pure substance made of only one type of atom, like oxygen (O) or gold (Au), while a molecule is formed when two or more atoms chemically bond, which can be atoms of the same element (like O2) or different elements (like H2O).
200
What is static electricity? *hint: electrons!
Static electricity is the accumulation of electric charge on the surface of an object.
This charge can be positive or negative and occurs when the atoms of a material gain or lose electrons.
200
Which planet in our solar system has the most moons? Any guesses how many?
Saturn! As of 2025, scientists have identified 274 moons around Saturn. The planet with the second highest number of moons is Jupiter with 95 moons.
300
Define biodiversity. Give one reason why threats to biodiversity are so harmful.
Biodiversity, or biological diversity, is simply the variety of all life on Earth, encompassing all animals, plants, fungi, and microorganisms, their genetic differences, and the diverse ecosystems (like forests, reefs, and deserts) they form and interact within.
It's the complex web of life, from genes to ecosystems, that sustains our planet and provides essential services like clean air, water, and food.
https://www.youtube.com/watch?v=KPzpdwE2ic4
300
What is the difference between a homogeneous mixture and a heterogeneous mixture? Give an example of each.
Homogeneous mixtures are uniform throughout (e.g., saltwater), while heterogeneous mixtures are not (e.g., salad)
300
What charge will a neutral material take on if it gains electrons?
Negative charge! Electrons carry a -1 charge.
300
Imagine that you are explaining to Grade 3 students why it gets dark at night and bright during the day. What would you tell them?
It is light during the day and dark at night because the Earth rotates on its axis every 24 hours. When your location faces the Sun, it is daytime (light), and as Earth spins, that location turns away from the Sun, causing nighttime (darkness).
400
Explain what a food web shows that a simple food chain does not. Name one consequence of removing a top predator from a food web. Draw a diagram of both to support your answer!
Food webs show multiple feeding relationships and energy flow between many organisms.
Removing a top predator can cause trophic cascade (overpopulation of prey, vegetation loss), loss in biodiversity, etc.
400
Describe the difference between an ionic bond and a covalent bond.
Ionic bond: Occurs between a metal and a non-metal, involves a transfer of electrons from the metal to the nonmetal
Covalent bond: Occurs between two non-metals, involves the sharing of electrons between atoms
400
Describe the difference between series and parallel circuits.
Series circuits feature a single path for current, causing all components to share voltage and fail if one breaks.
Parallel circuits offer multiple paths, providing equal voltage to each component and allowing others to function if one fails.
https://www.youtube.com/watch?v=-w-VTw0tQlE
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400
What causes a solar eclipse?
A solar eclipse is caused by the moon coming in between the sun and Earth. The sunlight is blocked (partially) and a shadow falls on Earth.
https://www.youtube.com/watch?v=cxrLRbkOwKs
500
What is the total number of atoms in the formula Mg3(PO4)2? How many atoms of each element are present?
13!
3 Magnesium, 2 Phosphorus, 8 Oxygen