You have a ring made from silver and zinc. What testing can be done to determine...
You have a ring made from silver and zinc. What testing can be done to determine if their is zinc in the ring. (try to use periodic trends and properties of elements in your answer)
Homework Answers
The ring is dissolved in concentrated nitric acid (HNO3) to give Zn2+ and Ag+ ions; the metals are oxidized by the oxidizing agents like nitric acid (H+ and NO3 -).
The resulting solution is diluted in a volumetric flask and is used for further analysis.
To the solution obtained, add Potassium Ferrocyanide ( K4[Fe(CN)6] ).If a white precipitate is formed, it confirms the presence of Zinc as the white precipitate formed is Zinc Ferrocyanide ( Zn2[Fe(CN)6] ) .
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You have a ring made from silver and zinc. What testing can be
done to determine...
You have done some testing at home and determined that you can smell ammonia gas at...
You have done some testing at home and determined that you can smell ammonia gas at a concentration of about 4.7 ppm (by pressure or volume) in the air. At what dissolved ammonia (NH3) concentration in the water (in mg/L) would you expect to notice a smell from the water? Assume you are at sea level and the temperature is 25 ̊C.
Review | Const A pure gold ring and pure silver ring have a total mass of 15.3 8. The two rings are heated to 70.3...
Review | Const A pure gold ring and pure silver ring have a total mass of 15.3 8. The two rings are heated to 70.3 °C and dropped into a 12.8 mL of water at 21.5 C. When equilibrium is reached, the temperature of the water is 23.8°C. Part A What is the mass of gold ring? (Assume a density of 0.998 g/mL for water.) Express your answer to two significant figures and include the appropriate units. Å ROO? Value...
Periodic Trends in Group II Objective In this experiment, the trend in one of the several...
Periodic Trends in Group
II
Objective
In this experiment, the trend in one of the several periodic
properties for group II of the Periodic Table will be
determined.
Introduction
Elements in the same group of the Periodic Table have similar
chemical and physical properties that gradually change as one goes
from one element in the group to the next. By observing the trends
in properties, the elements can be arranged in the order in which
they appear in the Periodic...
a, b, and c please 1. A determination of silver in waste water was done with...
a, b, and c please
1. A determination of silver in waste water was done with a method involving spling silver into the sample. A sample originally containing no silver was run six times with the following protocol. Each 100.0 mL sample was spiked with 200 g of silver and mixed well. From each of these prepared samples, a 5.00 mL aliquot was digested and the following results were obtained ug Ag found: 9.8, 9.2.9.3,9.5, 10.1, 8.9, 96, 9.4 a....
A pure gold ring (c = 0.128 J/g°C) and pure silver ring (c = 0.235 J/g°C)...
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What are your thoughts about the DNA testing available to determine you ancestory? Have you tried...
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8. You're doing some stress-testing on various models of glass jars to determine the height from...
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can someone help me to answer those questions 8. Explain the trend as you move across...
can someone help me to answer those questions
8. Explain the trend as you move across a row of the periodic table for each of the following some properties using your understanding of effective nuclear charge. Atomic radius b. Ionization energy 6. Electronegativity STOP Model 2 - The Alkali Metals Pare Atomic Number Core Charge Atomic Radius 1st lonization Energy Electro- negativity Lithium 0.91 Sodium 152 pm 186 pm 227 pm 520 kJ/mole 496 kJ/mole 419 kJ/mole 0.87 0.73 Potassium...
Review | Const A pure gold ring and pure silver ring have a total mass of 15.3 8. The two rings are heated to 70.3 °C and dropped into a 12.8 mL of water at 21.5 C. When equilibrium is reached, the temperature of the water is 23.8°C. Part A What is the mass of gold ring? (Assume a density of 0.998 g/mL for water.) Express your answer to two significant figures and include the appropriate units. Å ROO? Value...
Periodic Trends in Group
II
Objective
In this experiment, the trend in one of the several periodic
properties for group II of the Periodic Table will be
determined.
Introduction
Elements in the same group of the Periodic Table have similar
chemical and physical properties that gradually change as one goes
from one element in the group to the next. By observing the trends
in properties, the elements can be arranged in the order in which
they appear in the Periodic...
a, b, and c please
1. A determination of silver in waste water was done with a method involving spling silver into the sample. A sample originally containing no silver was run six times with the following protocol. Each 100.0 mL sample was spiked with 200 g of silver and mixed well. From each of these prepared samples, a 5.00 mL aliquot was digested and the following results were obtained ug Ag found: 9.8, 9.2.9.3,9.5, 10.1, 8.9, 96, 9.4 a....
PRE LAB QUESTIONS (5 pts) Please use complete sentences when answering these questions. 1. Dmitri Mendeleev organized the periodic table according to increasing atomic mass. How is the modern periodic table organized? 2. In your own words, describe the periodic law. 3. What can you say about elements in the same "group" on the Periodic Table? 4. Define the term, "electronegativity". 5. Define the term,"lonization energy". HYPOTHESIS If I use the trends on the Periodic Table, then I can predict...
8. You're doing some stress-testing on various models of glass jars to determine the height from which they can be dropped and still not break. The setup for this experiment, on a particular type of jar, is as follows. You have a ladder with n rungs, and you want to find the highest rung from which you can drop a copy of the jar and not have it break. We call this the highest safe rung It might be natural...
can someone help me to answer those questions
8. Explain the trend as you move across a row of the periodic table for each of the following some properties using your understanding of effective nuclear charge. Atomic radius b. Ionization energy 6. Electronegativity STOP Model 2 - The Alkali Metals Pare Atomic Number Core Charge Atomic Radius 1st lonization Energy Electro- negativity Lithium 0.91 Sodium 152 pm 186 pm 227 pm 520 kJ/mole 496 kJ/mole 419 kJ/mole 0.87 0.73 Potassium...
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