This substance contains regions that have different properties from those of other regions.
What is a heterogeneous mixture?
200
An interpretation of an observation.
What is an inference?
200
The study of the composition, structure and properties of matter and the processes that matter undergoes and the energy changes that accompany these processes.
What is chemistry?
200
These can be observed without changing the identity of the substance.
What is a physical property?
200
What is iron, nitrogen, calcium and mercury.
What is Fe, N, Ca, Hg?
200
When iron is melted it is classified as a ______________ change.
What is a physical change?
300
This can not be broken down into simpler substances by ordinary chemical means; contains only one kind of ATOM
(basic unit)[e.g. lead (Pb), Oxygen ( O2) ]
What is an element?
300
Research carried out for the sake of increasing knowledge.
What is basic research?
300
A sample with a fixed shape.
What is a solid?
300
These are semiconductors of electricity.
What are metalloids?
300
When iron combines with oxygen to form rust it is classified as a ________________ change.
What is a chemical change?
400
When substances are changed into new substances by breaking and making bonds.
What is a chemical reaction?
400
Typically involves the production and use of products that improve our quality of life.
What is technological development?
400
This has a fixed composition
What is a pure substance?
400
A change of substance from one state of matter to another.
What is a change in state?
400
When wood burns in air it is classified as a ______________ change.
What is a chemical change?
500
This has no fixed volume or shape and takes the shape and volume of its container.
What is a gas?
500
Solid, liquid and gas
What are the three states of matter?
500
A substance composed of a given combination of elements that can be broken down into those elements by chemical methods.
What is a compound?
500
A solution that is the same composition throughout.