(a)
Interpretation:
The burning of gasoline should be classified as chemical or physical change.
Concept Introduction:
Physical change:
If a compound or substance changes its state and that is reversible in nature then such change known as physical change.
Chemical change:
If a compound or substance changes its state and cannot be converted into its original form that change is known as chemical change and it is irreversible in nature.
(b)
Interpretation:
The making of ice cubes should be classified as chemical or physical change.
Concept Introduction:
Physical change:
If a compound or substance changes its state and that is reversible in nature then such change known as physical change.
Chemical change:
If a compound or substance changes its state and cannot be converted into its original form that change known as chemical change and it is irreversible in nature.
(c)
Interpretation:
The boiling of oil should be classified as chemical or physical change.
Concept Introduction:
Physical change:
If a compound or substance changes its state and that is reversible in nature then such change known as physical change.
Chemical change:
If a compound or substance changes its state and cannot be converted into its original form that change known as chemical change and it is irreversible in nature.
(d)
Interpretation:
The melting of lead should be classified as chemical or physical change.
Concept Introduction:
Physical change:
If a compound or substance changes its state and that is reversible in nature then such change known as physical change.
Chemical change:
If a compound or substance changes its state and cannot be converted into its original form that change known as chemical change and it is irreversible in nature.
(e)
Interpretation:
The rusting of iron should be classified as chemical or physical change.
Concept Introduction:
Physical change:
If a compound or substance changes its state and that is reversible in nature then such change known as physical change.
Chemical change:
If a compound or substance changes its state and cannot be converted into its original form that change known as chemical change and it is irreversible in nature.
(f)
Interpretation:
The formation of ammonia from nitrogen and hydrogen should be classified as chemical or physical change.
Concept Introduction:
Physical change:
If a compound or substance changes its state and that is reversible in nature then such change known as physical change.
Chemical change:
If a compound or substance changes its state and cannot be converted into its original form that change known as chemical change and it is irreversible in nature.
(g)
Interpretation:
The digesting of food should be classified as chemical or physical change.
Concept Introduction:
Physical change:
If a compound or substance changes its state and that is reversible in nature then such change known as physical change.
Chemical change:
If a compound or substance changes its state and cannot be converted into its original form that change known as chemical change and it is irreversible in nature.
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Chapter 1 Solutions
Introduction to General, Organic and Biochemistry
- Identify each process as a physical change or a chemical change. Give the basis for your answer. (a) making of ice cubes (b) burning of LPG (c) tarnishing of silver jewelry (d) melting of ice cubes (e) baking of breadarrow_forwardClassify each of the following changes as physical or chemical:(a) condensation of steam(b) burning of gasoline(c) souring of milk(d) dissolving of sugar in water(e) melting of goldarrow_forwardClassify each of the following changes as physical or chemical:(a) coal burning(b) ice melting(c) mixing chocolate syrup with milk(d) explosion of a firecracker(e) magnetizing of a screwdriverarrow_forward
- Determine whether each of the following represents a physical property or a chemical property: (a) Chlorine gas has a greenish-yellow tint. (b) The density of water at 4°C is 1.000 g/mL. (c) Hydrogen gas is very flammable. (d) Aluminum is a solid at 25°C. (e) Water is colorless and odorless. (f) Lemon juice tastes sour. (g) Gold does not tarnish. (h) Copper cannot be decomposed.arrow_forwardClassify each change as physical or chemical. (a) the explosion of gunpowder in the barrel of a gun(b) the melting of gold in a furnace(c) the bubbling that occurs when you mix baking soda andvinegar(d) the bubbling that occurs when water boilsarrow_forwardDecide whether each of the following processes is primarily a physical or a chem-ical 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.arrow_forward
- Classify each of the following as an element, a compound, or a mixture:(a) copper(b) water(c) nitrogen(d) sulfur(e) air(f) sucrose(g) a substance composed of molecules each of which contains two iodine atoms(h) gasolinearrow_forwardClassify each property as physical or chemical. (a) the tendency for platinum jewelry to scratch easily(b) the ability of sulfuric acid to burn the skin(c) the ability of hydrogen peroxide to bleach hair(d) the density of lead relative to other metalsarrow_forward1.24 Two beakers contain clear, colorless liquids. When the contentsof the beakers are mixed a white solid is formed. (a) Isthis an example of a chemical or a physical change? (b) Whatwould be the most convenient way to separate the newlyformed white solid from the liquid mixture—filtration, distillation,or chromatography.arrow_forward
- Classify 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 sunlightarrow_forwardClassify each of the following as a physical change or a chemical change. (a) Touching a lit candle to hydrogen soap bubbles gives an explosion. (b)Heating water in a flask produces moisture on the glass. (c) Combining two colorless solutions gives a yellow solid. (d) Pouring vinegar on baking soda produces gas bubbles.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_forward
- Introduction to General, Organic and BiochemistryChemistryISBN:9781285869759Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar TorresPublisher:Cengage Learning