Copper pennies Pour about 2 Tbs of vinegar into the bowl and add a 4 tsp of salt stir it up. Put about 5 pennies into the bowl and count the pennies to sit in the vinegar salt mixture for 5 minutes. Take out the pennies and rinse them out in some water. 1. What happens to the pennies? 2. Is it a physical or chemical change? Explain.

Copper pennies Pour about 2 Tbs of vinegar into the bowl and add a 4 tsp of salt stir it up. Put about 5 pennies into the bowl and count the pennies to sit in the vinegar salt mixture for 5 minutes. Take out the pennies and rinse them out in some water. 1. What happens to the pennies? 2. Is it a physical or chemical change? Explain.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 5ALQ: You may have noticed that when water boils, you can see bubbles that rise to the surface of the...

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You 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.
The photo below shows elemental iodine dissolving in ethanol to give a solution. Is this a physical or chemical change?
You may have noticed that when water boils, you can see bubbles that rise to the surface of the water. a. What is inside these bubbles? i. air ii. hydrogen and oxygen gas iii. oxygen gas iv. water vapor v. carbon dioxide gas b. Is the boiling of water a chemical or physical change? Explain.
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True 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.
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In Figure 1.5 you see macroscopic and particulate views of the element bromine. Which are the macroscopic views and which are the particulate views? Describe how the particulate views explain properties of this element related to the state of matter.
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A 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?
Suppose someone emptied ball bearings into a container of salt. Could you separate the ball bearings from the salt? How? Would your method involve no change, be a physical change, or be a chemical change?
Physical and Chemical Changes Say you are presented with two beakers, beaker A and beaker B, each containing a white, powdery compound. a From your initial observations, you suspect that the two beakers contain the same compound. Describe, in general terms, some experiments in a laboratory that you could do to help prove or disprove that the beakers contain the same compound. b Would it be easier to prove that the compounds are the same or to prove that they are different? Explain your reasoning. c Which of the experiments that you listed above are the most convincing in determining whether the compounds are the same? Justify your answer. d A friend states that the best experiment for determining whether the compounds are the same is to see if they both dissolve in water. He proceeds to take 10.0 g of each compound and places them in separate beakers, each containing 100 mL of water. Both compounds completely dissolve. He then states, Since the same amount of both substances dissolved in the same volume of water, they must both have the same chemical composition. Is he justified in making this claim? Why or why not?