Into to Biology

Beginning to Biology

Element

Purest form of material cannot be broken down.

Atoms

Basic unit of matter that make up all living things.

What are ATOMS made of?

Subatomic particles

What are the three subatomic particles, and their charges?

Protons-Positive, Neutrons-Neutral, Electrons-negative

On the model of an element, what word is on the bottom row?

The name of the element.

On the model of an element,what number is under the element's name?

Atomic Mass

Atomic #

the # of protons in the nucleus.

On the model of an element, what letter is in the center?

The symbol of an element.

On the model of an element, what number is on the top?

Atomic #

Atomic Mass

Total mass combination of particles in an atom.

Isotopes

Different forms of the same element. (Different neutron amounts)

Molecule

Group of atoms bonded together

Compound

When two or more elements are chemically bonded.

Ionic Bonds

When atoms give or take electrons away to fill outer energy levels. (positive attracted to negative) (I give/take)

Covalent

When atoms share their electrons to fill outer energy levels. (Cats share)

How many electrons are in the first three energy levels?

First- 2. Second- 8. Third-18. (level x itself^2)

Physical Chemical reaction

when a substance changes its shape. It does not chemically change. (water to ice, ice to evaporation)

Chemical Change

when a substance changes into a different substance.

Reactants

The molecules/elements that form a different product.

Product

What is produced when molecules/elements and sometimes catalysts are chemically combine.

Catalyst

something that helps a chemical reaction, and lowers the amount of energy needed.

Rules for balancing equations

1\.) can’t change subscripts 2.) Coefficient in front of molecule