Chemistry
What is the smallest unit of a chemical element?
Atom
What is the unit of electric current?
Ampere (A)
In order (from inside -> out), list the layers of the earth.
inner core, outer core, mantle, and crust
What is the basic unit of life?
The cell
What does the term variable mean in a scientific experiment?
A factor that can change or be changed
What type of bond is formed when atoms share electrons?
Covalent bond
In a circuit, what happens to the total current when more bulbs are added in series?
It decreases
What are tectonic plates?
Large slabs of the Earth’s crust that move slowly over the mantle
Where in the cell does photosynthesis occur?
In the chloroplasts
Name one safety precaution you should take when handling chemicals in a lab.
Wear safety goggles, gloves, or a lab coat
What are the three subatomic particles found in an atom?
Protons, neutrons, and electrons
What is the formula that links voltage, current, and resistance?
V = I × R
Name two types of plate boundaries.
Convergent, divergent, (and transform)
Explain how the circulatory and respiratory systems work together.
The respiratory system brings in oxygen, which the circulatory system delivers to cells and removes carbon dioxide.
A student is testing how light affects plant growth. What should they keep constant to ensure a fair test?
Temperature, type of plant, water amount, soil type, etc.
What is the difference between an element and a compound?
An element has only one type of atom; a compound has two or more elements chemically combined.
List 4 different types of energy
mechanical, chemical, electrical, thermal, nuclear, sound, and radiant, potential
What natural hazards are often found near plate boundaries?
Earthquakes, volcanoes, tsunamis
Name 2 biotic, and 2 abiotic factors
Biotic: plants, animals, bacteria, fungi
Abiotic: sunlight, water, soil, temperature
What does qualitative data mean?
Descriptive data (like colour, texture, or smell)
What is the difference between a physical change and a chemical change?
A physical change is reversible and doesn’t form a new substance; a chemical change is irreversible and forms new substances.
Burning biomass releases CO₂ into the atmosphere. Explain why it is still considered renewable.
Because the CO₂ released can be absorbed by new plants as they grow, creating a closed carbon cycle.
Explain how fossil evidence supports the theory of plate tectonics.
Similar fossils found on continents now far apart suggest they were once connected.
What is the difference between aerobic and anaerobic respiration?
Aerobic uses oxygen and produces more energy; anaerobic does not use oxygen and produces less.
If your data points are scattered widely on a graph, what does this tell you about reliability?
The results are less reliable or consistent.