The capacity to cause change, especially to do work.
What is energy?
100
Positively charged particles.
What are protons?
200
A liquid that is a mixture of two or more substances.
What is a solution?
200
Structures that carry out specialized jobs within an organ system.
What are organs?
200
This is the first step in the scientific method.
What is observation.
200
A protein or RNA molecule that speeds up metabolic reactions without being permanently changed or destroyed.
What is an enzyme?
200
Negatively charged particles that move around the nucleus of an atom.
What are electrons?
300
A measure of how difficult it is to stretch or break the surface of a liquid.
What is surface tension?
300
Groups of cells that have similar abilities and that allow the organ to function.
What is tissue?
300
This is used to test a hypothesis and its predictions.
What is an experiment
300
A starting material in a chemical reaction.
What is a reactant?
300
The number of protons in the nucleus of an atom.
What is the atomic number?
400
The attraction between different kinds of molecules.
What is adhesion?
400
Tiny structures that carry out functions necessary for cells to stay alive.
What are organelles?
400
The manipulated variable in an experiment.
What is an independant variable.
400
A material resulting from a chemical reaction.
What is a product?
400
Equal to the total number of protons and neutrons of the atom.
What is the atomic mass?
500
The binding together of like molecules, often by hydrogen bonds.
What is cohesion?
500
All the organisms in a given area as well as the abiotic factors with which they interact.
What is an ecosystem.
500
Often called the "top down" approach because the researcher starts at the top with very broad information and they work their way down to a specific conclusion.
What is deductive reasoning.
500
A chemical substance that reduces the amount of activation energy that is needed for a reaction to take place.
What is a catalyst?
500
With the atomic number of 10 and the atomic mass of 20, Neon has this many neutrons.