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< BackNext >PreviewMain Elements, Compounds, and Mixtures Preview Chapter 4 CRCT Preparation.

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Presentation on theme: "< BackNext >PreviewMain Elements, Compounds, and Mixtures Preview Chapter 4 CRCT Preparation."— Presentation transcript:

1 < BackNext >PreviewMain Elements, Compounds, and Mixtures Preview Chapter 4 CRCT Preparation

2 < BackNext >PreviewMain Chapter 4 CRCT Preparation 1. Which two substances in the table are most likely the same? Asubstances A and C Bsubstances B and D Csubstances C and D Dsubstances A and D

3 < BackNext >PreviewMain Chapter 4 CRCT Preparation 1. Which two substances in the table are most likely the same? Asubstances A and C Bsubstances B and D Csubstances C and D Dsubstances A and D

4 < BackNext >PreviewMain Chapter 4 CRCT Preparation 2.You are given two jars, each of which contains an unknown substance. You are asked to determine if the substances are different from one another or if each jar contains the same substance. What should you do to complete this task? ACompare the appearances of the substances. If the substances look the same, then they are the same. BCompare only the physical properties of the substances. If the substances have the same density or melting point, then they are the same. CCompare both the physical and the chemical properties of the substances. If the substances perform the same in a variety of tests, then they are the same. DCompare the physical states of the substances. If the substances are in the same state, then they are the same.

5 < BackNext >PreviewMain Chapter 4 CRCT Preparation 2.You are given two jars, each of which contains an unknown substance. You are asked to determine if the substances are different from one another or if each jar contains the same substance. What should you do to complete this task? ACompare the appearances of the substances. If the substances look the same, then they are the same. BCompare only the physical properties of the substances. If the substances have the same density or melting point, then they are the same. CCompare both the physical and the chemical properties of the substances. If the substances perform the same in a variety of tests, then they are the same. DCompare the physical states of the substances. If the substances are in the same state, then they are the same.

6 < BackNext >PreviewMain 3.If two poisonous elements are combined chemically, which of the following will be true of the resulting compound? AThe compound will be more poisonous than the gases. BThe compound will be as poisonous as the gases. CThe compound may or may not be poisonous. DThe compound will not be poisonous. Chapter 4 CRCT Preparation

7 < BackNext >PreviewMain Chapter 4 CRCT Preparation 3.If two poisonous elements are combined chemically, which of the following will be true of the resulting compound? AThe compound will be more poisonous than the gases. BThe compound will be as poisonous as the gases. CThe compound may or may not be poisonous. DThe compound will not be poisonous.

8 < BackNext >PreviewMain 4.Ellen made the illustration to show one of the steps in her most recent experiment. Which statement describes what Ellen was doing during this step of the experiment? Chapter 4 CRCT Preparation A She was using a chemical change to break down a compound into the elements that make it up. B She was using a physical change to separate the compounds that make up an element. C She was using a physical change to separate the components that make up a mixture. D She was using a chemical change to combine elements to form a compound.

9 < BackNext >PreviewMain 4.Ellen made the illustration to show one of the steps in her most recent experiment. Which statement describes what Ellen was doing during this step of the experiment? Chapter 4 CRCT Preparation A She was using a chemical change to break down a compound into the elements that make it up. B She was using a physical change to separate the compounds that make up an element. C She was using a physical change to separate the components that make up a mixture. D She was using a chemical change to combine elements to form a compound.

10 < BackNext >PreviewMain 5.The graph was constructed from data collected during a laboratory investigation. Which of the following values is the amount of sodium nitrate that can dissolve in 100 mL of water at 40°C? A0 g B40 g C100 g D130 g Chapter 4 CRCT Preparation

11 < BackNext >PreviewMain Chapter 4 CRCT Preparation 5.The graph was constructed from data collected during a laboratory investigation. Which of the following values is the amount of sodium nitrate that can dissolve in 100 mL of water at 40°C? A0 g B40 g C100 g D130 g

12 < BackNext >PreviewMain Chapter 4 CRCT Preparation 6.Ka-wai makes a solution which contains the maximum amount of sodium chlorate that can dissolve in 100 mL of water at 0°C. He heats the solution to 60°C. How much additional sodium chlorate must he add to once again have a solution that has the maximum amount of sodium chlorate dissolved in it at this new temperature? A2 g B40 g C50 g D80 g

13 < BackNext >PreviewMain Chapter 4 CRCT Preparation 6.Ka-wai makes a solution which contains the maximum amount of sodium chlorate that can dissolve in 100 mL of water at 0°C. He heats the solution to 60°C. How much additional sodium chlorate must he add to once again have a solution that has the maximum amount of sodium chlorate dissolved in it at this new temperature? A2 g B40 g C50 g D80 g

14 < BackNext >PreviewMain 7.Which of the following sentences best describes table salt, NaCl? ATable salt is a compound made from two elements. BTable salt is a mixture made from two elements. CTable salt is an element made from two mixtures. DTable salt is an alloy made from a metal and a nonmetal. Chapter 4 CRCT Preparation

15 < BackNext >PreviewMain Chapter 4 CRCT Preparation 7.Which of the following sentences best describes table salt, NaCl? ATable salt is a compound made from two elements. BTable salt is a mixture made from two elements. CTable salt is an element made from two mixtures. DTable salt is an alloy made from a metal and a nonmetal.

16 < BackNext >PreviewMain 8.Imagine that you were asked to classify four samples of equal and known volume, each of which was made up of a single element. Which factor would be most useful for identifying them? Amass Bshape Chardness Doriginal source Chapter 4 CRCT Preparation

17 < BackNext >PreviewMain Chapter 4 CRCT Preparation 8.Imagine that you were asked to classify four samples of equal and known volume, each of which was made up of a single element. Which factor would be most useful for identifying them? Amass Bshape Chardness Doriginal source

18 < BackNext >PreviewMain 9.Rafiq has a container filled with a clear liquid. He knows that the liquid is either a compound or a mixture but does not know which. What can Rafiq do to find out? Explain your answer. Chapter 4 CRCT Preparation

19 < BackNext >PreviewMain Chapter 4 CRCT Preparation 9. Answer - Full credit answers should include the following points: Mixtures can be separated by physical means but compounds cannot. Rafiq should try to separate the liquid into different substances by physical means, such as distillation, centrifuging, or evaporation. If Rafiq can separate the liquid into different substances by physical means, it is a mixture. If Rafiq cannot separate the liquid into different substances by physical means, it is probably a compound.

20 < BackNext >PreviewMain 10. Compare elements and compounds. How are they similar and how are they different? List two examples of each kind of substance. Chapter 4 CRCT Preparation

21 < BackNext >PreviewMain 10. Answer - Full credit answers should include the following points: Both elements and compounds are pure substances, which means that they are substances in which there is only one type of particle. An element is a pure substance that cannot be separated into simpler substances. A compound is a pure substance that is composed of two or more elements that are chemically combined. Com-pounds can be separated into simpler substances by chemical means. Students should give two examples of elements, such as carbon, oxygen, or gold, and two examples of compounds, such as water, carbon dioxide, or table salt. Chapter 4 CRCT Preparation


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