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  • Can we determine if liquids A, B, solid C, and liquid D are elements or compounds from their acid-base reaction products?
    No, we cannot tell just from the reaction products whether the substances are elements or compounds.
  • Is melting an ice cube a physical or chemical process?
    Melting an ice cube is a physical process because it changes state without altering chemical composition.
  • Select a chemical property of uranium.
    Reacts with cold water is a chemical property; color, density, odor, ductility are physical properties.

  • Which is an extensive property: temperature, volume, luster, concentration, or hardness?_updated

    Volume is an extensive property; others are intensive.
  • Classify the properties: silvery liquid appearance, density 13.53 g/cm3, freezing at −38.83 °C, reaction with iodine, forming yellow solid with nitric acid.
    Physical properties: appearance, density, freezing point; Chemical properties: reaction with iodine, forming yellow solid.
  • Convert 13°F to Kelvin.
    13°F equals approximately \(260\) K.
  • True or False: Increasing the coefficient in scientific notation means the exponent is negative.
    False. Increasing the coefficient usually means a positive exponent; decreasing it means a negative exponent.
  • What is the SI derived unit for kinetic energy and convenient units for a car and an electron?
    Energy unit is Joule (J). For a car: kilojoule (kJ) or megajoule (MJ); for an electron: femtojoule (fJ) or picojoule (pJ).
  • Convert 513 mK/s to K/s.
    513 mK/s equals \(5.13\times10^{-3}\) K/s.
  • How many significant figures are in 2.71×10^5?
    There are 3 significant figures in 2.71×10^5.
  • Reading and significant figures of a speedometer showing 115 mph and 185 km/h?
    115 mph and 185 km/h both have 3 significant figures.