Concept explainers
(a)
Interpretation:
A steak is cooked on a grill until well done is a physical or chemical property has to be given.
Concept Introduction:
Physical properties:
Physical properties can be observed or measured without changing the composition of matter. Physical properties are used to observe and describe matter.
Chemical properties:
Chemical properties are only observed during a
(b)
Interpretation:
The jagged edge of the fire polish at the end of the glass rod becomes smooth is a physical or chemical property has to be given.
Concept Introduction:
Refer to part (a).
(c)
Interpretation:
Chlorine bleach used to remove strain is a physical or chemical property has to be given.
Concept Introduction:
Refer to part (a).
(d)
Interpretation:
The solution turns cloudy and yellow when two colorless solutions are mixed is a physical or chemical property has to be given.
Concept Introduction:
Refer to part (a).
(e)
Interpretation:
The production of green powdery solid with volume ten times greater than original substance on heating is a physical or chemical property has to be given.
Concept Introduction:
Refer to part (a).
(f)
Interpretation:
Cutting of magnesium metal in a lab is a physical or chemical property has to be given.
Concept Introduction:
Refer to part (a).
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EBK FOUNDATIONS OF COLLEGE CHEMISTRY
- Which of the following represent physical properties or changes, and which represent chemical properties or changes? You curl your hair with a curling iron. You curl your hair by getting a “permanent wave” at the hair salon. Ice on your sidewalk melts when you put salt on it. A glass of water evaporates overnight when it is left on the bedside table. Your steak chars if the skillet is too hot. Alcohol feels cool when it is spilled on the skin. Alcohol ignites when a flame is brought near it. Baking powder causes biscuits to rise.arrow_forwardSuppose someone emptied ball bearings into a container of salt. Could you separate the ball bearings from the salt? How? Would your method involve no change, be a physical change, or be a chemical change?arrow_forwardClassify each of the following as (1) a physical property, (2) a physical change, (3) a chemical property, or (4) a chemical change. a. the process of burning a piece of newspaper b. the fact that metallic copper reacts with chlorine gas c. the process of melting ice d. the fact that metallic gold is a solid at room temperaturearrow_forward
- Aspirin is a pure substance. If you had the choice of buying a widely advertised brand of aspirin whose effectiveness is well known or the generic product of a new manufacturer at half the price, which would you buy? Explain.arrow_forwardA solution made by dissolving sugar in water is homogeneous because the composition is the same everywhere. But if you could look with very high magnification, you would see locations with water particles and other locations with particles of sugar. How can we say that a sugar solution is homogenous?arrow_forwardDefine physical change and chemical change. State which type of change occurs in each of the following statements: (a) Passing an electric current through molten magnesium chloride yields molten magnesium and gaseous chlorine. (b) The iron in discarded automobiles slowly forms reddish brown, crumbly rust.arrow_forward
- Decide whether each of the following processes is primarily a physical ora chemical change, and explain briefly:(a) Frost forms as the temperature drops on a humid winter night.(b) A cornstalk grows from a seed that is watered and fertilized.(c) A match ignites to form ash and a mixture of gases.(d) Perspiration evaporates when you relax after jogging.(e) A silver fork tarnishes slowly in air.Plan To decide whether a change is chemical or physical, we ask, “Does thesubstance change composition or just change form?”arrow_forwardClassify each of the following as a physical change or a chemical change. For each chemical change, explain how you can tell that a new substance has been formed. (a) Water boils and turns into steam. (b) Wood is sawed and made into a toy box. (c) Firewood burns and ashes remain. (d) Orange drink crystals are stirred into a pitcher of water. (e) Sugar, eggs, and flour are mixed and baked into cookies.arrow_forwardTwo beakers contain clear, colorless liquids. When the contents of the beakers are mixed, a white solid is formed. (a) Is this an example of a chemical or a physical change? (b) What would be the most convenient way to separate the newly formed white solid from the liquid mixture— filtration, distillation, or chromatography. Elaborate your answer.arrow_forward
- Classify each change as physical or chemical. (a) A balloon filled with hydrogen gas explodes upon contactwith a spark.(b) The liquid propane in a barbecue evaporates away becausesomeone left the valve open.(c) The liquid propane in a barbecue ignites upon contactwith a spark.(d) Copper metal turns green on exposure to air andwater.arrow_forwardThe 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 oilarrow_forwardWhich of the following statements describe physicalproperties and which describe chemical properties?(a) Iron has a tendency to rust. (b) Rainwater inindustrialized regions tends to be acidic. (c) Hemoglobinmolecules have a red color. (d) When a glass of wateris left out in the sun, the water gradually disappears.(e) Carbon dioxide in air is converted to more complexmolecules by plants during photosynthesis.arrow_forward
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