Structure & Models
This is the smallest unit of an element that keeps its chemical identity.
What is an atom?
Particles in this state vibrate in fixed positions.
What is a solid?
Melting point can be measured without making a new substance. What type of property is it?
What is a physical property?
Crushing a soda can changes its shape but not its substance. Name the type of change.
What is a physical change?
This law says the total mass stays the same when no matter enters or leaves.
What is the law of conservation of mass?
A sample contains only copper atoms. Classify it as an element, compound, or mixture.
What is an element?
Particles stay close together but slide past each other in this state.
What is a liquid?
The ability of iron to react with oxygen and form rust is this type of property.
What is a chemical property?
A cut apple turns brown as it reacts with oxygen. Name the type of change.
What is a chemical change?
A sealed bottle holds 35 grams of water. The water freezes. What is the mass of the ice?
What is 35 grams?
Every particle in a pure sample has hydrogen and oxygen atoms chemically joined. Classify the sample.
What is a compound?
Water vapor loses energy and forms drops on a mirror. Name the change of state.
What is condensation?
A material allows electric current to pass through it. Name this physical property.
What is electrical conductivity?
Salt dissolves in water and is recovered unchanged when the water evaporates. Classify the dissolving.
What is a physical change?
A sealed mixture has 12 grams of salt and 48 grams of water. What is its total mass?
What is 60 grams?
A model contains separate oxygen molecules and nitrogen molecules together. Classify the sample.
What is a mixture?
Dry ice changes directly from a solid to a gas. Name this change.
What is sublimation?
A sample has a mass of 24 grams and a volume of 8 cubic centimeters. What is its density?
What is 3 g/cm³?
Mixing two clear liquids produces a new insoluble solid. What is this solid called?
What is a precipitate?
In a sealed reaction, 18 grams of one substance and 7 grams of another form one product. What is its mass?
What is 25 grams?
A model shows three CO2 molecules. How many oxygen atoms are shown in total?
What is 6 oxygen atoms?
A gas cools into a liquid. Do its particles move closer together or farther apart?
What is closer together?
A metal is shiny, bends easily, conducts heat, and reacts with acid. Which listed property is chemical?
What is reacting with acid?
A candle has melting wax and burning wax. Which process forms new substances?
What is burning?
A reaction in an open cup starts with 80 grams and ends with 74 grams. Only gas escaped. What mass of gas escaped?
What is 6 grams?