Suggest physical changes by which the followingmixtures can be separated.(a) iron filings and wood chips(b) ground glass and sucrose (cane sugar)(c) water and olive oil(d) gold flakes and water
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Suggest physical changes by which the following
mixtures can be separated.
(a) iron filings and wood chips
(b) ground glass and sucrose (cane sugar)
(c) water and olive oil
(d) gold flakes and water
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- You are given a hammer a battery, a bulb, wires and switch(a) How could you use them to distinguish between samples of metals and non metals?(b) Assess the usefulness of these tests to distinguish between metals and non-metalsWhich of the following is best characterized as a heterogeneous mixture? Group of answer choices (a) Air (b) Sandy Dirt (c) An aqueous solution of NaCl (d) Electrum (an alloy of gold and silver) (e) Clear DiamondClassify each change as physical or chemical. (a) the rusting of iron(b) the evaporation of fingernail-polish remover (acetone) from the skin(c) the burning of coal(d) the fading of a carpet upon repeated exposure to sunlight
- You are given a hammer, a battery, a bulb, wires and switch.(a) How could you use them to distinguish between samples of metals and non- metals?(b) Asses the usefulness of these tests in distinguishing between metals and non-metals?7. State whether each of the following represents a chemical change or merely a physical change:(a) A few grams of sucrose (table sugar) are placed in a small beaker of deionized water; the sugar crystals “disappear,” and the liquid in the beaker remains clear and colorless.(b) A copper statue, over time, turns green.(c) When a teaspoon of baking soda (sodium bicarbonate) is placed into a few ounces of vinegar (acetic acid), volumes of bubbles (effervescence) are produced.Classify each property as physical or chemical. (a) the tendency of copper to turn green when exposed to air(b) the tendency of automobile paint to dull over time(c) the tendency of gasoline to evaporate quickly when spilled(d) the low mass (for a given volume) of aluminum relative to other metals
- The radius of an atom of krypton (Kr) is about 1.9 Å. (a) Express this distance in nanometers (nm). nm Express this distance in picometers (pm). pm (b) How many krypton (Kr) atoms would have to be lined up to span 1.0 mm? atoms (c) If the atom is assumed to be a sphere, what is the volume in cm³ of a single krypton (Kr) atom? cm³Which of the following will be homogeneous mixture? (A) All of them (B) N2 and Ar (C) C2H5OH and H2O (D) NH4Cl and H2O (E) C6H6 and C7H8Chemistry (b) A sampling plan is necessary to ensure that a laboratory sample is truly a representative of the entire population. (i) Describe the goals of the sampling plan. "It is possible to determine whether the population is homogeneous or heterogeneous if a single sample is collected and analyzed." Comment on this statement. (ii)
- Musical instruments like trumpets and trombones are madefrom an alloy called brass. Brass is composed of copper andzinc atoms and appears homogeneous under an optical microscope.The approximate composition of most brass objectsis a 2:1 ratio of copper to zinc atoms, but the exact ratio variessomewhat from one piece of brass to another. (a) Would you classify brass as an element, a compound, a homogeneousmixture, or a heterogeneous mixture? (b) Would it be correctto say that brass is a solution?Classify each property as physical or chemical. (a) the tendency of silver to tarnish(b) the shine of chrome(c) the color of gold(d) the flammability of propane gasThe following pairs of substances represent heterogeneous mixtures. For each pair, describe the steps you would follow to separate the components and collect them. Explain. (a) sugar and sand (b) iron filings and sand (c) sand soaked with oil