Science The Basics
Anything that has mass and takes up space
What is matter?
Electrons that are in the highest energy level of an atom of an element
What are valence electrons?
Substances that undergo a chemical change
What are the reactants?
The energy stored in chemical bonds
What is Chemical Energy?
A possible, testable explanation for one or more observations or a suggested, testable answer to a question.
What is a hypothesis
The smallest chemical unit of an element
What is an atom?
The part of the atom that has the positive charge in the nucleus
A force of attraction between atoms or a group of atoms due to the sharing or transferring of electrons
What is a chemical bond?
A chemical reaction in which a compound breaks down into two or more simpler substances
A factor that can change in an experiment
What is a variable
The smallest unit of a chemical compound, composed of two or more atoms bonded together
What is a molecule
The number of protons in an atom
What is the atomic number?
New substances formed as a result of a chemical change
What are products?
Compounds made of only two elements
What are Binary Compounds?
A logical conclusion drawn from observations, previous knowledge, and available information
What is an inference
A pure substance that cannot be broken down into a simpler substance and contains only one type of atom
What is an element?
The sum of the protons and neutrons in the nucleus of an atom
What is the mass number?
An atom of a group of atoms that has a positive or negative charge
A chemical reaction in which two or more substances react to form a single compound
Which of these fall within the branch of Physical Science?
a. Counting the number of legs of an insect
b. Observing a beam of light from a flashlight
c. Measuring the time it takes for a ball to drop from a specific height
d. Recording the month of year a plant produces flowers
B and C
The ratio of a substance's mass to its volume
What is density?
Which is not a way scientists can tell protons, neutrons and electrons apart?
a. charge
b. mass
c. visibility
d. location in the atom
c. visibility
The force of attraction between molecules of the same substance so that they tend to stay together
What is cohesion?
A chemical reaction in which a substance reacts rapidly with oxygen, often producing heat and light