compunds and mixtures
What is a compound?
A substance made of two or more elements chemically combined
Which of the following is an example of a mixture?
Air
How can compounds be separated into their elements?
By chemical reactions
Which statement about mixtures is true?
They can be separated by physical methods
What type of mixture is sand and water?
Heterogeneous mixture
What is the main difference between compounds and mixtures?
Compounds are made by chemical bonding, mixtures are not
Which of the following is a homogeneous mixture?
Saltwater
In a compound, the elements are combined in:
A fixed ratio
Which method can separate a mixture of salt and water?
Distillation
What type of bond holds the elements together in a compound?
Chemical bond