Concept explainers
Interpretation:
From the description of the element fluorine given below, the physical and chemical properties have to be identified.
“Fluorine is a pale-yellow corrosive gas that reacts with practically all substances. Finely divided metals, glass, ceramics, carbon and even water burn in fluorine with a bright flame. Small amounts of compounds of this element in drinking water and toothpaste prevent dental cavities. The free element has a melting point of
Concept Introduction:
Chemical property:
The property that describes the reactivity of a material and in the process forms new and different substances.
Physical property:
The property that can be measured without changing the composition of the sample.
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Chemistry: Principles and Practice
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- Classify each of the following properties of the metal magnesium as a physical property or a chemical property. a. Solid at room temperature b. Ignites upon heating in air c. Hydrogen gas is produced when it is dissolved in acids d. Has a density of 1.738 g/cm3 at 20Carrow_forwardWhich of the following are compounds, and which are elements? aNa2S bBr2 cPotassium hydroxide dFluorine eCompound or element fCompound or elementarrow_forwardWhich of the these statements are qualitative? Which are quantitative? Explain your choice in each case. (a) The atomic mass of carbon is 12.011 (12.011 atomic mass units). (b) Pure aluminum is a silvery-white metal that is nonmagnetic, has a low density, and does not produce sparks when struck. (c) Sodium has a density of 0.968 g/mL. (d) In animals the sodium cation, Na+, is the main extracellular cation and is important for nerve function.arrow_forward
- Indicate whether each of the following statements is true or false. a. Both elements and compounds are pure substances. b. A compound results from the physical combination of two or more elements. c. In order for matter to be heterogeneous, at least two compounds must be present. d. Compounds, but not elements, can have a variable composition.arrow_forwardIn each of the following pairs, decide which is an element and which is a compound. (a) Pt(NH3)2Cl2 or Pt (b) copper or copper(II) oxide (c) silicon or sandarrow_forwardMake molecular-level (microscopic) drawings for each of the following. a. Show the differences between a gaseous mixture that is a homogeneous mixture of two different compounds, and a gaseous mixture that is a homogeneous mixture of a compound and an element. b. Show the differences among a gaseous element, a liquid element, and a solid element.arrow_forward
- All of the following processes involve a separation of either a mixture into substances or a compound into elements. For each, decide whether a physical process or a chemical reaction is required. a Sodium metal is obtained from the substance sodium chloride. b Iron filings are separated from sand by using a magnet. c Sugar crystals are separated from a sugar syrup by evaporation of water. d Fine crystals of silver chloride are separated from a suspension of the crystals in water. e Copper is produced when zinc metal is placed in a solution of copper(II) sulfate, a compound.arrow_forwardIndicate whether each of the following statements describes a physical or a chemical property. a. Diamonds are very hard substances. b. Gold metal does not react with nitric acid. c. Lithium metal is light enough to float on water. d. Mercury is a liquid at room temperature.arrow_forwardIn the following description of the element bromine, identify which of the properties are chemical and which are physical. Bromine is one of the few elements that is a liquid at room temperature. It is an acrid-smelling substance that reacts readily with most metals. It evaporates easily, so most containers of bromine are filled with visible amounts of red fumes. Most bromine is obtained from sodium bromide, a compound found in salt beds.arrow_forward
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