Chemical Changes
This is the main sign that a chemical reaction has occured.
What is something new has formed.
This is the formula for finding density.
What is mass /volume.
solid to liquid
What is melting?
Ice melting is an indicator of what type of physical change?
change of state
The ability to do work is called this.
What is energy?
What is a change in odor?
Calculate volume:
length 5 cm
height 1 cm
width 5 cm
5 x 5 x1 = 25 cm cubed
liquid to solid
What is freezing?
A stick breaking in half is an indicator of this type of physical change.
What is change of shape?
What is a homogenous mixture?
What is a chemical reaction (reactivity or burning)?
An object displaces 19 mL of water. What is the object's volume?
What is 19 cm cubed
liquid to gas
Folding a paper in half is an indicator of this type of physical change.
What is change of size.
The science word for the tiny atoms that make up all matter
What are particles?
I heat up a solid. After heating, the solid looks the same, but the mass and density have changed. Chemical reaction?
YES! Something new formed if it has a different density.
A cup weighs 3 g. The cup and the liquid together weigh 9 g. What is the mass (weight) of the liquid alone?
6 g.
gas to liquid
What is condensation?
Sugar dissolving is an indicator of this type of physical change.
What is a heterogenous mixture?
Some students burn a sample of magnesium. After burning, the sample looks different and has different density and mass. Explain.
A chemical reaction occured- the density is different. Density is a characteristic property.
Calculate density:
mass 80 g
volume 20 g
density = 4
solid to gas
What is sumlimination?
Water boiling is an indicator of this type of physical change.
What is change of state?
Salt water is an example of: a mixture, a compound, or a pure substance.
What is a mixuture. Bonus if you said homogenous mixture.