Introductory Chemistry For Today
8th Edition
ISBN: 9781285644561
Author: Seager
Publisher: Cengage
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A physical change occurs when a
a. silver bowl tarnishes.
b. glue gun melts a glue stick.
c. peach spoils.
d. bracelet turns your wrist green.
Chem reactions
Changing hydrogen and oxygen into water is a ....
a. chemical change
b. physical change
c. double displacement reaction
d. conservation reaction
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- aIs the process of boiling water exothermic or endothermic with respect to the water? bA charged object is moved closer to another object that has the same charge. The energy of the system changes. Is it a change in kinetic energy or potential energy? Is the energy changes an increase or a decrease?arrow_forwardTrue or false? Salad dressing (such as oil and vinegar dressing) separating into layers after standing is an example of a chemical change because the end result looks different from how it started. Explain your answer.arrow_forward(For Exercises 4546) Solutions containing nickel(II) ion are usually bright green in color. When potassium hydroxide is added to such a nickel(II) solution, a pale-green fluffy solid forms and settles out of the solution. The fact that a reaction takes place when potassium hydroxide is added to a solution of nickel(II) ions is an example of a properly. . The fact that a solution of nickel(II) ion is bright green is an example of a property.arrow_forward
- When a vapor condenses into a liquid: a.it absorbs heat. b.it generates heat. c.its temperature rises. d.its temperature drops.arrow_forwardIf a sample of iron and a sample of zinc come into contact, the zinc corrodes but the iron does not. If a sample of iron comes into contact with a sample of copper, the iron corrodes but the copper does not. Explain this phenomenon.arrow_forwardA hot metal block is plunged into water in a well-insulated container. The temperature of the metal block goes down, and the temperature of the water goes up until their temperatures are the same. A total of 1500 J of energy' is lost by the metal object. By how much did the energy of the water increase? What law of science is illustrated by this problem?arrow_forward
- Suppose that you are closing a cabin in the north woods for the winter and you do not want the water in the toilet tank to freeze. You know that the temperature might get as low as 30. C, and you want to protect about 4.0 L water in the toilet tank from freezing. Calculate the volume of ethylene glycol (density = 1.113 g/mL; molar mass = 62.1 g/mol) you should add to the 4.0 L water.arrow_forwardThe flashlight in the photo does not use batteries. Instead, you move a lever, which turns a geared mechanism and finally results in light from the bulb. What type of energy is used to move the lever? What type or types of energy are produced?arrow_forwardA book is held 6 feet above the floor and then dropped. Which statement is true? a.The potential energy of the book is converted to kinetic energy. b.The potential energy of the book is destroyed. c.Kinetic energy is created. d.The total energy of the system will not be conserved.arrow_forward
- Which of the following is a chemical change? A. Burning paper B. dropping glass C. Dissolving salt in water D. Melting iron E. Mixing gold silver and copper to make a ringarrow_forwardWhich of the following is an example of a chemical change a. Sun burn from sun exposure B. Iodine vaporizing yC. Ice melting D. Alcohol evaporating E. Water boilingarrow_forwardDuring a chemical change: A. Chemical composition changes B. There is only a physical state change C. There are no changes D. Solids are always formedarrow_forward
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