Physical or Chemical
Dissolving?
Physical because you can boil or evaporate to get it back.
What is found on the Periodic Table?
Elements
What is an element?
A substance made of only 1 type of atom.
Explain the pH scale.
It goes from 0-14. 0-6 are acids, 7 is neutral, and 8-14 are bases.
What is the center of an atom called?
The nucleus.
Flammability?
Chemical because adding heat changes the substance.
How is the Periodic Table Arranged?
By increasing atomic mass.
What is a mixture?
When 2 or more substance do not chemically combine.
What are substance that are neutral called?
Salts.
Name the subatomic particle found in the nucleus.
The protons and neutrons.
Phase change?
Physical because it is reversible.
What are the columns on the Periodic Table called? (2 Answers)
Groups or families.
What is a solution?
A homogeneous mixture where one thing dissolves into another.
What does an acid taste like? A base?
Sour. Bitter.
Name the charges of the 3 subatomic particles.
Protons - positive
Electrons - Negative
Neutrons - Neutral or no charge
Rusting?
Chemical because you can't get the metal to come back.
What is the #1 similarity of elements in a column?
The valence electrons. The electrons on the highest level.
Name the parts of a solution.
The solute is the thing that dissolves and the solvent is what makes the solute dissolve.
Why are cleaning products strong bases?
Bases have a special property where they can dissolve dirt and oil.
Where are electrons found?
Outside the nucleus in the electron cloud.
Name 5 signs of a chemical reaction.
1. Gas produced
2. Color change
3. Temperature change
4. Produces an odor
5. Gives off light , or sound
Define atomic number.
The number of protons in the nucleus of the atom.
Is air a mixture or a pure substance? Why?
A mixture of different kinds of gases. If it weren't a mixture, then humans could not pull the oxygen out to breathe.
How can you spot an acid and a base in a chemical formula?
Acids have an H at the beginning. Bases have an OH at the end.
Sequence the subatomic particles form largest to smallest.
Neutron, proton, electrons.