Chemical / Physical change
What is a physical change?
A change where no new substance is formed.
What is matter?
Anything that has mass and takes up space.
What is an element?
A pure substance made of only one type of atom
What is a compound?
Two or more elements chemically combined.
What is solubility?
The ability of a substance to dissolve.
What is a chemical change?
A change where a new substance is formed.
What is particle theory?
All matter is made of these tiny particles.
What is O?
The chemical symbol for oxygen
What is the chemical formulae for water?
H₂O is the chemical formula for this.
If an object is less dense than water it will do this.
Float
Melting ice is an example of this type of change.
What is a solid?
This state of matter has a fixed shape and volume.
What are chemical symbols?
Scientists use these as shorthand for elements.
The small number in a chemical formula.
The separation method used to remove insoluble solids from a liquid.
Filtration
Bubbling gas, colour change, and temperature change are evidence of this.
Chemical Change
What is a gas?
In this state, particles are far apart and move freely.
What is C
Carbon
CO₂ contains this many oxygen atoms.
2
What is evaporation?
The process used to recover dissolved salt from salt water.
Rusting iron is an example of this type of change.
Chemical Change
What are particles close together but able to move past one another?
Describe the particle arrangement in a liquid.
What is H?
Hydrogen
Why do compounds have different properties from the elements that form them?
Because the atoms are chemically bonded in a new arrangement.
What is chromatography?
This separation technique is commonly used in forensic investigations to compare inks.