Bonding
The atoms composing compounds are held together by this
Chemical Bonds
A pure substance composed of only one type of atom.
Element
Because one end of a water molecule is slightly positive and the other end is slightly negative, water molecules are _____.
polar
The part of the solution that gets dissolved is called the?
solute
For life on Earth to exist, it is very important that water molecules stick together. Why do water molecules stick together?
Water molecules are very polar. The end of one molecule is attracted to the opposite end of a different water molecule.
What is the pH scale used to measure?
What is the range of the pH scale?
The pH scale is used to measure how acidic or basic a solution is.
It ranges from 0 to 14
This type of bond is created by the transfer or exchange of electrons between two atoms
Ionic Bond
A substance made up of two or more elements chemically combined.
Compound
Name given to a mixture that has uniform characteristics throughout
homogenous
The part of a solution that does the dissolving is called the?
solvent
Because water molecules stick together, water remains a _____ over a wide range of temperatures
liquid
If a solution has a pH of 7, the solution is?
If a solution has a pH greater than 7, the solution is?
If a solution has a pH of less than 7, the solution is?
Neutral
Basic
Acidic
Atoms that have gained or lost electrons are called?
What charge will the atom have if it has gained electrons?
What charge will the atom have if it has lost electrons?
Ions
Negative
Positive
A combination of two or more substances that are not chemically combined.
Mixture
The attraction between the oxygen of one water molecule to the hydrogen of a different water molecule is called a?
A mixture of water and undissolved particles that are so small that they do not settle out is called a?
suspension
During the day, large bodies of water _________ energy from the sun.
This helps to ______ the land masses during the day.
absorb and cool
This type of compound forms hydrogen ions in a solution
acid
This type of bond is formed when electrons are shared between two atoms.
Covalent Bond
What are the three subatomic particles?
protons, neutrons, electrons
Oil and water in the same container would be an example of what type of mixture?
heterogenous
What part of the atom is always involved in the formation of bonds between atoms?
electrons
At night, large bodies of water _________ energy.
This helps to ______ the land masses at night.
release and warm
This type of solution has a lower hydrogen ion concentration than pure water.
basic
In a covalent bond, some atoms have a ______ for shared electrons than do other atoms.
As a result, the electrons are NOT shared ______.
The atom around which the electrons spend the most time becomes _______.
The atom around which the electrons spend the least time becomes _______.
This is called a _______ molecule.
Greater attraction
Not Shared equally
Slightly negative
Slightly positive
Polar
What is the basic unit of all matter?
atom
The attraction between like molecules is called?
The attraction between unlike molecules is called?
Cohesion
Adhesion
This type of bond is formed when ions of opposite charges are attracted to one another.
ionic bond
List three reasons why water is so important to life on Earth.
1.Because water sticks together it is a liquid at a wide range of temperatures.
2.Water stabilizes the temperatures on Earth.
3.Water is the solvent of life.
4.Evaporative cooling
These substances are produced by cells to prevent sharp and sudden changes in pH.
buffer