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Substances are a form of matter that has uniform and unchanging compositions. Salt is a substance. Water is a substance. Oxygen is a substance. Gold is a substance. All of these substances have static compositions. This quiz is over the division of matter commonly called substances. There are two kinds of substances: elements and compounds. Using what you have learned, select the best answer from the choices.
There are approximately _____ elements.
98
210
115
Endless
True or False? Elements can be broken down into simpler substances.
False
True
How many elements occur naturally?
91
110
118
90
What is the atomic number of the last naturally occurring element on the periodic table?
90
110
92
52
True or False, Compounds are substances that are made up of two or more elements.
True
False
An important characteristic of compounds is that their composite elements combine in definite proportions by mass. This law is called what?
Law of Multiple Proportions
Law of conservation of mass
Law of definite proportions
Law of conservation of matter
Which of the following is a compound containing non-metals only?
Sodium carbonate
Iron fluoride
Methane
Calcium chloride
An important characteristic of compounds is that their composite elements combine in definite proportions by mass. This law is called what?
Law of Multiple Proportions
Law of conservation of mass
Law of definite proportions
Law of conservation of matter
