Vocabulary Terms
A pure substance that contains two or more elements chemically joined in a fixed proportion.
What is a compound?
True or False:
A pure substance always has a fixed composition.
What is true?
True or False:
Nonmetals have good conductivity.
What is false?
Most metals are good conductors of electricity and therefore have conductivity. Thus, most nonmetals have poor conductivity.
Pure substance or Mixture:
A cube of sugar.
Physical or Chemical Change:
Sugar dissolving in water.
What is Physical?
The smallest unit of a chemical compound, composed of two or more atoms bonded together.
What is a molecule?
True or False:
A compound has different properties than the elements that compose it.
What is False?
A good example is water, which is made up of hydrogen and oxygen. Water is a liquid at room temperature, which hydrogen and oxygen are gases at room temperature.
True or False:
Deposition is when a gas changes directly to a solid, skipping the liquid phase.
What is true?
Pure substance or Mixture:
A glass of lemonade.
What is a mixture?
Physical or Chemical Change:
Rusting metal on a bike.
What is chemical?
Anything that has mass and takes up space (has volume).
What is matter?
A pure substance that cannot be broken down into a simpler substance and contains only one type of atom.
What is element?
When a liquid changes to the gaseous phase.
What is evaporation?
The substance in a solution that gets dissolved.
What is solute?
Physical or Chemical Change:
Shredding paper.
What is physical?
The energy an object has due to its motion.
The smallest chemical unit of an element?
What is atom?
A gas changes to the liquid phase.
What is condensation?
The substance in a solution in which the solute dissolves.
What is solvent?
Physical or Chemical Change:
When copper is exposed to water vapor and oxygen it forms a thin, blueish-green coating called a patina.
What is chemical?
The ratio of a substance's mass to its volume.
What is density?
A pure substance that contains two of more elements chemically joined in a fixed proportion.
What is compound?
This has definite volume but no definite shape.
What are liquids?
An evenly distributed mixture made by dissolving one substance into another.
What is solution?
True or False:
The melting point is a physical property.
What is true?
i.e.. melting ice to water will not change what they are made of.