BIOLOGY
In a food chain, what do you call organisms that produce their own food, like plants?
Producers
Why are compounds harder to separate than mixtures?
Because compounds are chemically bonded, while mixtures are not.
When a rollercoaster goes down the hill, its potential energy changes into what other type of energy?
Kinetic energy (or movement energy)
A lake loses 2,000 liters of water daily through evaporation. How much water is lost in 7 days
2,000L×7=14,000L
What kind of scientific tool uses a series of paired choices to help you identify an unknown organism?
A dichotomous key (or simply, a key)
Calculate the result of the following: the number of sulfur atoms in a sulfur molecule , divided by the number of oxygen atoms in an oxygen molecule , minus the number of helium atoms in a helium molecule.
3
Why can sound not travel in space?
Because there are no particles (no medium) in space to carry sound waves.
What do we call water falling to the ground as rain, snow, or hail?
Precipitation
Red blood cells are a type of specialized cell. What is their main function in the body?
To carry oxygen
If you mix a strong acid with a strong base, what neutral substance is often formed along with a salt?
Water
What is the name for the large body of matter that our planet Earth orbits?
The Sun
Why are viruses not considered living things?
They cannot carry out life processes on their own - they need a host cell
What organelle is often called the "powerhouse" of the cell because it produces energy?
Mitochondria
If 50g of ice melts completely, how much water is produced?
50g of water, as the mass remains the same during a state change
What is the measure of the amount of matter an object contains, which does not change with gravity?
MASS
What are the 7 life processes of living organisms?
Movement, respiration, sensitivity, growth, reproduction, excretion, nutrition
What part of a plant cell is a tough outer layer that provides support and protection?
CELL WALL
What is the name given to the organized chart that classifies all known elements?
The Periodic Table
If you drop a ball, what force causes it to fall to the ground?
Gravity
Why are decomposers important in ecosystems?
They break down dead things and recycle nutrients.