The particles in this state of matter are far apart and move freely
Gas
100
This endothermic phase change is when a solid becomes a liquid
Melting
100
The substances that are the result of a chemical reaction are called this
Products
100
These have a pH below 7
Acids
100
All matter consists of these
Atoms
200
The particles in this state of matter are close together but they can slide past each other
Liquid
200
All phase changes are what kind of change-- physical or chemical?
Physical changes
200
The substances that you start with in a chemical reaction are called this
Reactants
200
These have a bitter flavor
Bases
200
These are the top two components of the atmosphere and their percentages
Nitrogen (78%) and Oxygen (21%)
300
The particles in this state of matter do not move much-- they just vibrate in place
Solid
300
This phase change is when matter in a gas state becomes a liquid.
Condensation
300
What scientific Law is demonstrated by a balanced chemical equation?
The Law of Conservation of Mass
300
These feel slippery to the touch.
Bases
300
What is the density of an object with a volume of 60 cubic centimeters and a mass of 30 grams
1/2 gram per cubic centimeter
400
This state of matter has a fixed volume but indefinite shape
Liquid
400
In this phase change, matter goes from a solid state to a gas state
Sublimation
400
What is the common outcome for all chemical reactions?
New substances with different properties are formed
400
These react with metals
Acids
400
If you react 4 grams of Hydrogen with Oxygen, and the reaction results in 36 grams of Water (H2O), what is the mass of the Oxygen that reacted?
32 grams
500
This force is created by collisions between gas particles and the inside surface of their container.
Pressure
500
When a liquid goes through an endothermic phase change, the change is called this.
Vaporization/Evaporation/Boiling
500
Name three signs of a chemical reaction
Any combination of: odor change, color change, heat released or taken in, light produced, gas produced, formation of a solid precipitate, new substance with new properties forms
500
This is the term for a reaction between an acid and a base of equal strength
Neutralization reaction.
500
Why are the metals in group 1 called "Alkali" metals?