This
When a solid changes directly into a gas
What is sublimation?
Shredding, crushing, melting, boiling, breaking, chopping
What are examples of a physical change?
m/v
What is the formula for finding Density?
The process by which a liquid becomes a gas
What is evaporation?
Dry ice
An example of a material that sublimates?
This is how density and matter are related
What is density if a measure of the amount of matter in a given volume of a substance?
When the grass is wet with dew and slowly dries in the morning sunshine
What is evaporation?
The appearance of a new substance
What is a chemical change?
When a liquid starts to boil
What is the bubbles of gas form inside a liquid and energetically escape?
This is how melting point, melting, and freezing point are related
What is a substance melts at its melting point, which is the same temperature as its freezing point?
Steel has very HIGH/LOW melting point
What is high?
This is why the ability to burn defined as a chemical property instead of a physical property
What is because the material changes?
The process by which a gas changes its state to become a liquid
What is condensation?
This is how you could identify a substance by use of density
What is to compare it with the density of other objects?
Digesting, rusting, burning, dissolving, baking, cooking
What are examples of chemical changes?
Irreversible changes have occured
What is a chemical change?
Answer question 3 on page 67 of your textbook
What is pure gold?
What is in between iron and copper?
Substances change but keep the same identity
What is physical change?
This is how we could identify a substance by use of magnetism
What is by seeing how the object reacts to a magnet?
A small toy has a volume of 20 cm and a mass of 45g. The density of the toy is....
What is 2.25g/cm?
Explain how condensation occurs
What is when a gas cools, it loses energy. As the particles move more slowly, the attractions among them cause droplets of liquid to form?
The lowest temperature at which a substance begins to melt
What is melting point?
The density of a book that has a mass of 400 g and a volume of 600 cm is...
What is .7 g/cm?
An electric current can be used to decompose, or break down, water into oxygen gas and hydrogen gas. This is an example of a _________________ Change
What is chemical?