1) This is the smallest unit of an element. a) atom b) molecule c) compound d) nucleus 2) Any combination of two or more atoms that are chemically combined is called this. a) molecule b) compound c) element d) pure substance 3) This picture represents which of the following? a) Element b) Compound c) Molecule 4) This is any combination of two or more atoms from different elements that are chemically combined. a) compound b) molecule c) element d) pure substance 5) This picture represents which of the following? a) Element b) Compound c) Molecule 6) This picture represents which of the following? a) Element b) Compound c) Molecule 7) What is the picture displayed? a) atom b) element c) compound 8) Are these molecules also compounds? a) YES b) NO 9) Are these molecules also compounds? a) YES b) NO 10) Hydrogen is a pure substance represented by the chemical symbol H. Which of the following best describes hydrogen? a) Hydrogen is an element made of two or more kinds of atoms. b) Hydrogen is a compound made of only one kind of atom. c) Hydrogen is a compound made of two or more kinds of atoms. d) Hydrogen is an element made of only one kind of atom.

Atoms, Elements and Compounds

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