1) What is the basic unit from which all matter is made? a) Molecule b) Element c) Atom d) Compound 2) What is the positively charged center of an atom called? a) Electron cloud b) Nucleus c) Proton d) Neutron 3) Substances made up of only one type of atom are called: a) Molecules b) Compounds c) Mixtures d) Elements 4) How are elements represented? a) By chemical formulas b) By one- or two-letter symbols c) By atomic numbers d) By their physical properties 5) What is a molecule? a) A group of different atoms b) A group of similar atoms c) A group of chemically bonded atoms d) A group of elements 6) What is a compound? a) A substance made of only one type of atom b) A mixture of different elements c) A group of molecules d) A substance made of chemically combined elements 7) Which method involves separating liquids by boiling them? a) Filtration b) Evaporation c) Distillation d) Magnetic attraction 8) How is sea salt harvested from the ocean? a) Filtration b) Evaporation c) Distillation d) Magnetic attraction 9) What method involves passing a substance through water to filter out larger particles? a) Distillation b) Evaporation c) Filtration d) Magnetic attraction 10) What is a heterogeneous mixture? a) A mixture where the substances are not chemically bonded b) A mixture where the substances are evenly distributed c) A mixture where the substances have the same properties d) A mixture where the substances are in different phases 11) What is the chemical formula for water? a) H b) H2 c) O2 d) H2O 12) What type of mixture is salt water? a) Heterogeneous b) Homogeneous (Solution) c) Compound d) Element 13) What type of mixture is air? a) Heterogeneous b) Homogeneous c) Compound d) Element 14) Ethanol is made from sugars in corn and other plants. What is it used for? a) Powering engines b) Cooking c) Cleaning d) Water purification 15) What is the chemical formula for carbon dioxide? a) CO b) CO3 c) CO2 d) C2O

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