1. 4.0 ml of a liquid weighs (has a mass of) 100.0 g. What is the density of the liquid? a) 0.400 g/ml b) 0.025 g/ml c) 0.04 g/ml d) 25.0 g/ml 2. What is the name of the change in phase from gas to liquid? a) Condensation b) Freezing c) Melting d) Boiling 3. What is the charge on a proton? a) +1 b)-1 c) 0

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