Chemical and Physical Properties

Key Questions

• What is the difference between a physical and a chemical property?

  Answer:

  Chemical properties are only evident during chemical reactions.

  Explanation:

  You can measure and observe physical properties without needing to make any chemical changes to a substance (i.e. no bonds needs to be made or broken, and the chemical composition of the substance is not changed).

  So things like colour, melting point, boiling point, density, hardness and so on are all physical properties.

  Chemical properties can only be measured and observed by making changes to the substance on an atomic/molecular scale by forming or breaking chemical bonds. So something like heat of combustion can only be measured by combusting the substance. Enthalpy of formation can only be measured by forming a (new) substance. These are chemical properties.

  Simon Moore · 1 · May 23 2018

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• How do the physical properties of molecules with strong intermolecular forces compare with those of molecules with weak attractive forces?
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• Is conductivity a physical or a chemical property?
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• How does detergent change the physical properties of water?
• How does adding salt change the physical properties of water?
• How can physical properties be used to separate a mixture?
• Do chemical properties change when water boils?
• What is the difference between a physical and a chemical property?
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• Can the flammability of ethyl alcohol be reduced?
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• How does the chemical properties of water effect polar bears?
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• What type of a property is the color of rust?
• Are there changes in the physical and chemical properties of a substance when it undergoes a physical change? Is the same true for chemical changes?
• What effect does observing a substances physical properties have on the substance?
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• If you find an element in nature in its pure elemental state, what can you infer about the element's chemical reactivity?
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• Is copper ductile or brittle?
• Which of the following elements would be best suited for electrical wiring: gold, sulfur, or neon?
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• What physical property is identical for the isomers of #C_5H_12# and #C_6H_14#?
• What type of attractive force must be overcome in order to melt the following in their solid state?
• What is #P_2O_5#?
• What is the reactivity trend of halides?
• What are physical properties of lithium?
• What are pure substances?
• Is the molar volume a physical or chemical property?
• What physical property is identical for the isomers of #C_5H_12# ?
• Why can the samples of platinum and copper have the same extensive properties but not the same intensive properties?
• How would you distinguish between a physical property and a chemical property, giving an example of each?
• What are two physical properties that characterized matter?
• What is a substance formed by the chemical combination of two or more elements in definite proportions?
• Where are chemicals found?
• Which ingredient (chemical) gives soda pop its fizz?
• Which of these changes involved a physical change and not a chemical change?
• Water and hydrogen and peroxide (#H_2O_2#) both consists of hydrogen oxygen atoms. Why do they have different chemical and physical properties.?
• How would you contrast intensive and extensive physical properties?
• How is hydrogen peroxide antimicrobial?
• Consider various effects of moist and dry heat to control microbial growth. What methods would best reduce microbes without altering the taste and chemical composition of beer?
• State the difference between a physical change and a chemical change, and list three indications that a chemical change has occurred. Which indication is most suggestive of a chemical reaction?
• What is an example of a chemical property of water?
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• Is luster a chemical or physical property?
• Is hardness a physical or chemical property?
• Is bitter taste physical or chemical?
• What is the process when a substance conceived to lose electrons?
• How would we identify an unknown metal?
• What are the chemical and physical properties of calcium that are described in the following paragraph?
• Is an endothermic process an example of a physical or chemical change?
• What is the difference between the physical properties and the chemical properties of a substance?
• What is the difference between water and hydrogen peroxide?
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• What does a dosage tell you about a chemical?
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• What property is measured by a ruler?
• A person gets cooler by perspiring. Is this a chemical or physical change?
• What physical property can be shown by scratching one material with another?
• What are indicators that a chemical change has taken place?
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• A chemist dissolved crystals of an unknown substance into water at room temperature. He found that 33 g of the substance can be dissolved into 100 mL of water. What property of the unknown substance was the chemist most likely investigating?
• What does it mean if a chemical or physical property is periodic?
• When a match stick turns to ash while burning is it a chemical or physical change?
• How does adding salt water to fresh water alter the fresh water's physical properties?
• How do freezing point, boiling point, and vapor pressure for the solvent change upon addition of a solute?
• Specific heat is a physical property. ls it intensive or extensive?
• How are new chemical properties, and principles discovered?
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• Acetone has a boiling point of 123 °c. Is that chemical or physical?
• Is density a physical property or a chemical property?
• On a cold winter day, why does a steel metal fence post feels colder than a wooden fence post of identical size?
• Why do dry sodium chloride and the solutions of sodium nitrate and sodium chloride all impart the same color to the flame?
• What are examples of physical property?