Concept explainers
(a)
Interpretation:
A seed growing into a plant has to be defined as a chemical change or a physical change.
Concept Introduction:
Chemical change:
When a substance gets converted to different kinds of matter, it is said to be chemical change.
Physical change:
When a substance undergoes change, without change in its composition, it is said to be physical change.
(b)
Interpretation:
Distillation of alcohol has to be defined as a chemical change or a physical change.
Concept Introduction:
Refer to part-a.
(c)
Interpretation:
Mixing an Alka-Seltzer tablet with water has to be defined as a chemical change or a physical change.
Concept Introduction:
Refer to part-a.
(d)
Interpretation:
Hammering iron into a horseshoe has to be defined as a chemical change or a physical change.
Concept Introduction:
Refer to part-a.
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Chapter 1 Solutions
Chemistry: Principles and Practice
- Decide whether each of the following is a physical property or a chemical property of the substance. a Salt substitute, potassium chloride, dissolves in water. b Seashells, calcium carbonate, fizz when immersed in vinegar. c The gas hydrogen sulfide smells like rotten eggs. d Fine steel wool (Fe) can be burned in air. e Pure water freezes at 0C.arrow_forwardWhich among the following are physical changes? a blowing glass; b fermenting grapes; c forming a snowflake; d evaporating dry ice; e decomposing a substance by heating it.arrow_forwardThe following photo shows the element potassium reacting with water to from the element hydrogen, a gas, and a solution of the compound potassium hydroxide. (a) What states of matter are involved in the reaction? (b) Is the observed change chemical or physical? (c) What are the reactants in this reaction, and what are the produces? (d) What qualitative observations can be made concerning this reaction?arrow_forward
- Classify 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 decomposing hydrogen peroxide b. the fact that a block of ice can be chipped into smaller pieces c. the process of evaporating a liquid d. the fact that water freezes at 32Farrow_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_forwardThe following are properties of substances. Decide whether each is a physical property or a chemical property. a Chlorine gas liquefies at 35C under normal pressure. b Hydrogen burns in chlorine gas. c Bromine melts at 7.2C. d Lithium is a soft, silvery-colored metal. e Iron rusts in an atmosphere of moist air.arrow_forward
- The following data refer to the element phosphorus. Classify each as a physical or a chemical property. (a) It exists in several forms, for example, white, black, and red phosphorus. (b) It is a solid at 25C and 1 atm. (c) It is insoluble in water. (d) It burns in chlorine to form phosphorus trichloride.arrow_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_forwardWhich of these changes are physical and which are chemical? Explain.(a) Plants make sugar from carbon dioxide and water. (b) Water vapor in the air forms frost. (c) A goldsmith melts a nugget of gold and pulls it into a wire?arrow_forward
- Define 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_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_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_forward
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