(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
- 1-67 If 168 g of an unknown liquid requires 2750 cal of heat to raise its temperature from 26oC to 74oC, what is the specific heat of the liquid?arrow_forward1-87 Water that contains deuterium rather than ordinary hydrogen (see Section 2-4D) is called heavy water. The specific heat of heavy water at 25oC is 4.2 17 J/g oC. Which requires more energy to raise the temperature of 10.0 g by 10oC, water or heavy water?arrow_forward1-35 You are taken for a helicopter ride in Hawaii from Kona (sea level) to the top of the volcano Mauna Kea. Which property of your body would change during the helicopter ride? (a) height (b) weight (c) volume (d) massarrow_forward
- 1-92 A solar cell generates 500. kJ of energy per hour. To keep a refrigerator at 4oC, one needs 250. kcal/h. Can the solar cell supply sufficient energy per hour to maintain the temperature of the refrigerator?arrow_forward1-66 How many calories are required to heat the following (specific heats are given in Table 1-4)? (a) 52.7 g of aluminum from 100oC to 285oC (b) 93.6 g of methanol from —35oC to 55oC (c) 3.4 kg of lead from —33oC to 730oC (d) 71.4 g of ice from —77oC to —5oCarrow_forward1.71 Is touch screen technology better described as a single design or as a more complex system? Explain your answer.arrow_forward
- 1-91 In calculating the specific heat of a substance, the following data are used: mass = 92.15 g; heat = 3.200 kcal; rise in temperature = 45oC. How many significant figures should you report in calculating the specific heat?arrow_forward1-78 The kinetic energy possessed by an object with a mass of 1 g moving with a velocity of 1 cm/s is called 1 erg. What is the kinetic energy, in ergs, of an athlete with a mass of 127 lb running at a velocity of 14.7 mi/h?arrow_forward1-70 (Chemical Connections IA) The average lethal dose of heroin is 1.52 mg/kg of body weight. Estimate how many grams of heroin would be lethal for a 200-lb man.arrow_forward
- 1-77 Classify these as kinetic or potential energy: (a) Water held by a dam (b) A speeding train (c) A book on its edge before falling (d) A falling book (e) Electric current in a lightbulbarrow_forward1-76 If the density of air is 1.25 10-3 g/cc, what is the mass in kilograms of the air in a room that is 5.3 m long, 4.2 m wide, and 2.0 m high?arrow_forwardA sample of mercury(II) oxide was heated to produce mercury metal and oxygen gas. Then the liquid mercury was cooled to 40C, where it solidified. A glowing wood splint was thrust into the oxygen, and the splint burst into flame. Identify each physical change and each chemical change.arrow_forward
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