Introductory Chemistry For Today
8th Edition
ISBN: 9781285644561
Author: Seager
Publisher: Cengage
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7. What is a pure substance that is only made of type of atom?
A. Element
C. Compound
D. Elixir
B. Suspension
What is a molecule that is made of atoms of two or more elements chemically
8. bonded together?
A. Heterogeneous
B. Heteronuclear
C. Homogeneous
D. Homonuclear
9. Which best describes heterogeneous mixtures?
A. They must always be made of liquid components. No gas or solid components.
B. The components must always be mixed or dispersed uniformly within the same
physical state.
C. The components are always visible and distinguishable from the other
components.
D. All of the options are correct.
10 Which best describes a homogenous mixture?
A. They must always be made of liquid components. No gas or solid components.
B. The components must always be mixed or dispersed uniformly within the same
physical state.
C. The components are always visible and distinguishable from the other
components.
D. All of the options are correct.
11 Which method would be the most effect to separate…
Which substance can be separated by filtration?
A. Compound
B. Element
C. Mixture
D. Solution
Which is an example of physical property of matter? *
A. Baking a cake
B. Cooking of gelatin
C. Melting of ice
D. Rusting of metal
Which is an example of chemical property of matter?
A. Digestion of food
B. Evaporation of water
C. Sublimation of moth balls
D. Condensation of water vapor
Which is a physical property of matter?
A. Combustibility
B. Corrosiveness
C. Density
D. Reactivity
Classify each substance as a pure substance, a homogeneous mixture, or a heterogeneous mixture.a. air c. soil e. sedimentb. aerosol d. water f. muddy water
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- How do you distinguish (a) chemical properties from physical properties? (b) distillation from filtration? (c) a solute from a solution?arrow_forwardClassify each pure substance represented below by a capital letter as an element or a compound. Indicate when such a classification cannot be made, and explain why. a. Two elements when mixed combine to form only substance L. b. An element and a compound when mixed form substances M and Q. c. Substance X is not changed by heating.arrow_forwardTrue or false? Mixtures always result in a chemical reaction because they consist of two or more substances and thus combine to create a new product.arrow_forward
- ¡n a sample of a gaseous substance, more than 99% of the overall volume of the sample is empty space. How is this fact reflected in the properties of a gaseous substance compared with the properties of a liquid or solid substance?arrow_forwardThe composition of a given pure compound is always no matter what the source of the compound.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
- 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_forwardYou want to cook some raw noodles to make a pasta dish for supper. So, you turn on the gas stovetop (which uses a flame), place a large pot of water over the flame, wait for the water to boil, place the noodles ¡n the boiling water for 11 minutes, and then drain the water from the noodles. Identify one example of a physical change and one example of a chemical change in this process. Explain your answer for each.arrow_forwardPotassium sulfate has a solubility of 15 g/ 100 g water at 40C. A solution is prepared by adding 39.0 g of potassium sulfate to 225 g of water, carefully heating the solution, and cooling it to 40C. A homogeneous solution is obtained. Is this solution saturated, unsaturated, or supersaturated? The beaker is shaken, and precipitation occurs. How many grams of potassium sulfate would you expect to crystallize out?arrow_forward
- In Chapter 3, we learned that all matter is composed of atoms. In this chapter, we learned that most common substances are either compounds or mixtures of compounds. How can these both be true? Explain.arrow_forwardWhen camping in the mountains, you boil a pot of water on a campfire to make tea. Which of the following is a chemical change? (a) The water boils. (b) The campfire wood burns. (c) The tea dissolves in the hot water. (d) The pot melts from the heat of the fire.arrow_forwardYou receive a mixture of table salt and sand and have to separate the mixture into pure substances. Explain how you would carry out this task. Is your method based on physical or chemical properties? Explain.arrow_forward
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