Chemistry
Is melting ice a physical change or a chemical change?
phsyical
What is the main function of the circulatory system?
move blood, oxygen, and nutrients through the body.
Name one greenhouse gas.
CO2, methane (CO4)
What is the fastest thing in the universe?
Light
What safety gear protects your eyes?
safety goggles
When wood burns, is that a physical or chemical change?
chemical
Why are alveoli important in the lungs?
They are where gas exchange happens (oxygen in, carbon dioxide out).
Why does melting sea ice harm polar bears?
They lose hunting and living space
What tool lets us see far away objects in the sky?
telescope
Which strand of SCIENCE studies living things?
biology
What is one difference between a physical change and a chemical change?
Physical = no new substance; Chemical = new substance forms.
Which type of blood vessel carries blood away from the heart?
Arteries.
Give one example of renewable energy.
Solar, wind, hydro (water)
Why can you see yourself in a mirror?
It reflects light
Why do scientists repeat experiments?
To check results are reliable.
What gas do we breathe out during respiration?
carbon dioxide
Why do cells in the stomach have different structures than brain cells?
Cells are specialized to perform different functions.
How does cutting down forests affect climate change?
Less CO₂ absorbed → more in the air.
Why does a straw look bent in water?
It bends light (refraction)
What is the difference between observation and inference?
Observation = what you see; Inference = what you think it means.
What is one sign that a chemical change has happened?
bubbles, colour change, heat, new substance
What is the connection between organ systems in the body?
They work together — one system depends on others (e.g., respiratory + circulatory for oxygen delivery).
What does the ozone layer protect us from?
UV radiation from the sun
Which part of the eye lets light in?
the pupil
Why do scientists share results?
So others can confirm or build on them