WORKSHEET ON ELEMENTS AND COMPOUNDS



WORKSHEET I4ELEMENTS AND COMPOUNDSPart 1: Read the following information on elements, compounds and mixtures. Fill in the blanks where necessary.Elements:A pure substance containing only one kind of ____________.An element is always uniform all the way through (homogeneous).An element _____________ be separated into simpler materials (except during nuclear reactions).Over 100 existing elements are listed and classified on the ____________________.Compounds:A pure substance containing two or more kinds of _______________.The atoms are _________________ combined in some way. Often times (but not always) they come together to form groups of atoms called molecules. A compound is always homogeneous (uniform).Compounds ___________________ be separated by physical means. Separating a compound requires a chemical reaction. The properties of a compound are usually different than the properties of the elements it contains. Part 2: Classify each of the following as elements (E), compounds (C) or Mixtures (M). Write the letter X if it is none of these.___Diamond(C)___Sugar (C6H12O6)___Milk___Iron (Fe)___Air___Sulfuric Acid (H2SO4)___Gasoline___Electricity___Krypton (K)___Bismuth (Bi)___Uranium (U)___Popcorn___Water (H2O)___Alcohol (CH3OH)___Pail of Garbage___A dog ___Ammonia (NH3)___Salt (NaCl)___Energy___Gold (Au)___Wood___Bronze ___Ink___Pizza___Dry Ice (CO2)___Baking Soda (NaHCO3)___Titanium (Ti)___Concrete Question1:?? Which property does not describe a compound?1.It is a pure substance.2.It is mixed in any proportion by mass.3.It cannot be separated into constituents by physical means.4.It is composed of two or more elements.Question5:?? Which one of the following are elements?1.Oxygen2.Hydrogen chloride gas3.Argon4.ammoniaQuestion9:?Which of these elements is not a metalloid?1.Tungsten2.Germanium3.Bismuth4.AntimonyQuestion10:Which one of the following is a mixture of two elements 1. iron fillings + sulphur powder 2. sugar + common salt 3. water +milk 4. air Q6. Give the differences between elements and compounds.Q7. Classify the following into elements, compounds and mixtures: (a) Sodium (b) Soil (c) Sugar solution (d) Silver (e) Calcium carbonate (f) Tin (g) Silicon (h) Coal (i) Air (j) Soap. (k) Methane (l) Carbon dioxide (m) Blood. Q8. Explain why water is a compound and not a mixture? ................
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