States & Matter
What is a phase?
A NOTICEABLY DIFFERENT FORM OR STATE OF THE SAME SUBSTANCE.
The tiny pieces that all matter is made of are...
ATOMS.
A change from one phase to another is called...
A PHASE CHANGE.
Explain what a chemical reaction is.
A PROCESS IN WHICH ATOMS REARRANGE TO FORM NEW SUBSTANCES.
What is a population?
A GROUP OF THE SAME TYPE OF ORGANISM LIVING IN ONE AREA.
A solid does what?
HOLDS ITS SHAPE.
What is a molecule?
A GROUP OF ATOMS JOINED TOGETHER IN A PARTICULAR WAY.
What is kinetic energy?
ENERGY AN OBJECT HAS BECAUSE IT IS MOVING.
Starting substances in a chemical reaction are called...
REACTANTS.
Living and nonliving things interacting together makes up...
AN ECOSYSTEM.
Which phase takes the shape of its container?
A LIQUID.
Why do scientists use models?
TO STUDY THINGS TOO SMALL TO SEE.
TO STUDY THINGS TOO LARGE TO SEE.
What happens to molecules' speed when energy is added?
MOLECULES MOVE FASTER.
Can atoms be created or destroyed during a reaction?
NO.
The population that is eaten by another population is the...
RESOURCE POPULATION.
What are two characteristics of a gas?
HAS NO VISIBLE SHAPE & FILLS ITS CONTAINER.
What is the molecular scale?
THINGS/MOLECULES TOO SMALL TO BE SEEN WITH JUST THE HUMAN EYE.
TRUE OR FALSE
Molecular attraction is a pull between two molecules that is always the same for a substance.
TRUE.
What are products?
What would have to happen in terms of births and deaths for a population increase?
MORE BIRTHS THAN DEATHS.
How are the molecules of a gas moving?
THEY MOVE FREELY.
THEY AWAY FROM EACH OTHER.
THEY SPREAD OUT/AWAY.
What does changing the type of atoms or number of atoms do to a substance?
CHANGES THE SUBSTANCE'S PROPERTIES.
______________ is a measure of the average kinetic energy of the molecules of a substance.
TEMPERATURE.
TRUE or FALSE
During a chemical reaction, atoms change from one type of atom to another type.
FALSE.
The larger the consumer population, the ________ energy storage molecules it will need. Therefore, it will eat more, causing more _________ in the resource population.
MORE; DEATHS.