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1. Pure substances are classified into elements and compounds. Elements are the simplest form of matter. Which of the following statements describes an element?
a. It is composed of atoms of two or more elements that bond together.
b. It can be decomposed into simpler type of substances.
c. It contains only kind of atom.
d. It can be separated physically.
2. Which of the following statements describes a compound?
a. it consists of atoms of two or more different elements bond together.
b. It cannot be decomposed into simpler type of substances.
c. it can be separated by physical means.
d. it contains only one kind of atom.
3. Which of the following is an element?
a. Carbon monoxide (CO)
b. Germanium (GE)
c. Glucose (CHO)
d. Nitrous oxiode (N2O)
4. which of the following is NOT a group of elements?
a. Colloid
b. Metals
c. Non-metals
d. metalloids
5. Boron (B), Calcium (Ca), Methane (CH4), Sulfur dioxide (SO2), which of the following are compounds?
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