Matter
What are the three states of matter?
Solid, liquid and gas
What is a molecule?
Two or more atoms bonded together
What is the periodic table?
An arrangement of the elements
What is an acid?
A substance with a pH less than 7
What is another name for a combination reaction?
A synthesis reaction
What is an example of a physical property of matter?
Options: Color, density, volume, mass, boiling point, melting point, hardness, malleability, solubility, conductivity
What are the three subatomic particles that make up atoms?
Protons, neutrons and electrons
What are the rows of the periodic table called?
Periods
What does the pH scale measure?
How acidic or basic a substance is
What type of reaction is it when an element replaces a similar element in a compound?
Single replacement reaction
When can chemical properties of matter be observed?
During chemical reactions
Which subatomic particles make up the nucleus of an atom?
Protons and neutrons
What does the atomic number of an element stand for?
The number of protons
What is the range of the pH scale?
0-14
What kind of chemical reaction always has oxygen as one of its reactants?
Combustion reaction
What does the Law of Conservation of Matter state?
Matter cannot be created or destroyed, only transformed.
What is an ion?
An atom that has gained or lost an electron; a positively or negatively charged atom
Most of the elements are classified as what?
Metals
When you add water to a base, what happens to the pH?
It decreases.
Neutralization or acid-base reaction is what type of reaction?
Double replacement reaction
What state of matter is a substance in when its molecules are densely packed together?
Solid
What are the electrons in the outermost shell called?
Valence electrons
Elements that share some qualities with metals and are found in between metals and nonmetals on the periodic table are known as what?
semimetals or metalloids
What is it called when you add water to substance?
Dilution
What are the 5 signs that a chemical reaction has occurred?
Change in color, formation of a precipitate, formation of a gas, odor change, and temperature change