1) What is the smallest unit of an element that retains the properties of that element? a) atom b) molecule c) compound d) ion 2) Which of the following is NOT a state of matter? a) solid b) gas c) liquid d) energy 3) What is the atomic number of carbon? a) 6 b) 12 c) 14 d) 16 4) What is the total number of elements currently known to science? a) 92 b) 105 c) 118 d) 137 5) Which of the following is a chemical change? a) ice melting into water b) cutting a piece of paper c) burning wood d) dissolving sugar in water 6) What is the charge of a proton? a) positive b) negative c) neutral d) variable 7) Which of the following is NOT a subatomic particle? a) electron b) neutron c) proton d) isotope 8) What is the SI unit of measurement for mass? a) kilogram b) liter c) meter d) gram 9) What is the term for a substance that cannot be broken down into simpler substances by chemical means? a) molecule b) atom c) compound d) element

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