Elements and Atoms
A substance made of only one type of atom
An element
Anything that has mass and takes up space
Matter
A substance with a pH below 7
Acid
The chemical formula for water
H2O
The substance that does the dissolving in a solution
Solution
The smallest unit of an element that still has the properties of that element
An atom
Two or more elements chemically joined together
A compound
A substance with a pH above 7
Base
Water is often called the "universal ______" because it dissolves many substances
Solvent
The substance that gets dissolved
Solute
The positively charged particle found in the nucleus
A proton
In CO2, how many oxygen atoms are present?
2
If a substance changes from pH 6 to pH 3, did it become more or less acidic?
More acidic
Water molecules are attracted to each other due to ______________
Cohesion
In salt water, what is the solute?
Salt
The particle with no charge found in the nucleus
A neutron
Is salt water a compound or a mixture?
A mixture
True or false... bleach is an example of an acid
False
What is the main example of adhesion discussed in class yesterday?
Pouring water into a beaker (meniscus... water molecules sticking to the side of the glass)
A student mixes 20 g of salt with 80 g of water and keeps stirring until the salt can no longer be seen. What is the solvent?
Water
What two particles make up an element's mass?
Protons + Neutrons
True or false... dissolving sugar in tea is a chemical change
False
Why does your stomach acid need to be super acidic?
To help aid in digestion and break down food
Why is water a universal solvent?
Because of water's polarity it is allowed to interact with many different substances
If you add more sugar to a glass of water until no more will dissolve, the solution is now ____________
Saturated