Atoms are the basic units of matter. Every single thing in the world is composed entirely of . That includes both and .
> It would take you more than years to count the atoms in a grain of sand!
Atoms consist of 3 kinds of particles:
The center of the atom is called the , and it contains all of the protons and neutrons. Electrons the nucleus, forming around the nucleus.
>Each orbit can hold a of electrons
An element is one particular type of atom. The number of protons in an atom determines what of element it is.
>There are elements that make up everything in the universe
Your body is made up majorly of only 4 elements: Carbon, oxygen, nitrogen and hygrogen
how the atom will look
how the atom will react with other atoms
how the atom weighs
The 1st orbit can hold electrons
The 2nd orbit can hold electrons
The 3rd orbit can electrons
Often atoms in nature are found to other atoms. Atoms can be bonded to each other , , or even times.
The properties of substances completely change when they form compounds.
Atoms bond together in 2 different ways. The most important way is through...
exchanging electrons or ionic bonding
sharing electrons or covalent bonding
Atoms bond for one reason and one reason only: they want to have as many electrons as possible so they can be the biggest and the best
An is an atom that has or one or more electrons. An ion forms because an atom is more when its outermost energy level (orbit) is .
Atoms with electrons in the outer shell tend to these electrons. Atoms with electrons in the outer shell tend to a few more electrons in order to fill their shells.
An ionic bond is formed through the electrical force between oppositely charged ions. Once they exchange electrons, atoms become very attracted to each other.
Not all atoms easily or electrons. Some of them prefer to their electrons (particularly the )
A covalent bond forms when atoms...
share a pair of electrons
steal a pair of electrons
neutralize a pair of atoms
What are the two ways to represent bonds:
Covalent bonds and Valence diagrams
Lewis dot structures and covalent bonds
Straight lines and Lewis dot structures
A molecule is...
two or more atoms held together by covalent bonds
a covalent bond
organisms bonded together
Chemical reactions change substances into different substances by and
Cellular respiration is an important process that:
helps us digest our foods into simple sugars so we can use them as energy
reacts with a simple sugar called glucose in order to form usable energy for your cells
converts sugar into oxygen
are the substances changed during a chemical reaction
the reactants are glucose and oxygen
or all of the options
Products are the substances made by a reaction.
In order to create new
create old( create new, wreck old, create old ) compounds from the previous, we have to break
observe( break, make, observe ) the original
existing( original, new, existing ) bonds and then form
take the( form, demolish the, take the ) new ones. To break the old bonds, we have to put energy in.
Because different bonds have different strengths we may need...to break it
more or less energy
several different reactions
more or less force
Energy is released when bonds form. When a bond forms, the amount of energy released is ____________ than/to the amount of energy required to break that bond again.
Endothermic reactions absorb more energy than they release. This results in the absorption of energy.