Question 26 (3 points) The number of copper atoms present in 2.35 ng of copper wire equal... Question 27 (3 points) Saved (0.5 pts each) Give an example of a. Homogeneous mixture b. A nonmetal that exists as liquid C. A nonmetal that exists as a single atom d. An alkali earth metal e. Heterogeneous mixture f. A metal that exists as a liquid at room temperature. Paragraph B I Uv a. Sea water b. Bromine (Br) c. Helium (He)

Question 26 (3 points) The number of copper atoms present in 2.35 ng of copper wire equal... Question 27 (3 points) Saved (0.5 pts each) Give an example of a. Homogeneous mixture b. A nonmetal that exists as liquid C. A nonmetal that exists as a single atom d. An alkali earth metal e. Heterogeneous mixture f. A metal that exists as a liquid at room temperature. Paragraph B I Uv a. Sea water b. Bromine (Br) c. Helium (He)

Introductory Chemistry: A Foundation

9th Edition

ISBN:9781337399425

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter9: Chemical Quantities

Section: Chapter Questions

Problem 57QAP: Hydrogen peroxide is used as a cleaning agent in the treatment of cuts and abrasions for several...

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Hydrogen peroxide is used as a cleaning agent in the treatment of cuts and abrasions for several reasons. It is an oxidizing agent that can directly kill many microorganisms: It decomposes upon contact with blood, releasing elemental oxygen gas (which inhibits the growth of anaerobic microorganisms); and it foams upon contact with blood, which provides a cleansing action. In the laboratory, small quantities of hydrogen peroxide can be prepared by the action of an acid on an alkaline earth metal peroxide, such as barium peroxide. BaO2(s)+2HCl(aq)H2O2(aq)+BaCl2(aq) What amount of hydrogen peroxide should result when 1.50 g of barium peroxide is treated with 25.0 mL of hydrochloric acid solution containing 0.0272 g of HCI per mL?
It sodium peroxide is added to water, elemental oxygen gas is generated: :math>Na2O2(s)+H2O(l)NaOH(aq)+O2(g) ppose 3.25 g of sodium peroxide is added to a large excess of water. What mass of oxygen gas will be produced?
What is true about the chemical properties of the product? a. The properties are more like chemical A. b. The properties are more like chemical B. c. The properties are an average of those of chemical A and chemical B. d. The properties are not necessarily like either chemical A or chemical B. e. The properties arc more like chemical A or more like chemical B, but more information is needed. Justify your choice, and for choices you did not pick, explain what is wrong with them.
What mass of HCl is contained in 45.0 mL of an aqueous HCl solution that has a density of 1.19 g cm-3 and contains 37.21% HCl by mass?
In an accident, a solution containing 2.5 kg of nitric acid was spilled. Two kilograms of Na2CO3 was quickly spread on the area and CO2 was released by the reaction. Was sufficient Na2CO3 used to neutralize all of the acid?
Is there a difference between a homogeneous mixture of hydrogen and oxygen in a 2:1 mole ratio and a sample of water vapor? Explain.
Is there a difference between a homogeneous mixture of hydrogen and oxygen in a 2:1 ratio and a sample of water vapor? Explain.
You wish to prepare 211 grams of 16.6 % Mg(CH3COO),. . You will need grams of magnesium acetate and mL of water. Assume that the density of water is 1.00 g /ml.
J= M = i 0: = 1. NaBH4 2. dilute H* N 1. K 2. L 1.03 2. S(CH3)2 K= H3CO H3CO. M N = P = 1. NaNH2 2. Br CI L= O P 1. CN- 2. Na (s), NH3 (1), cold
Valuable minerals (chemicals) can be obtained from ores, which are natually occuring mixtures. One ore cotains 38% magnetite, a mineral with the chemical formual Fe3O4. Fe3O4 contains 72.4% iron. What mass of ore (in tons) would contain 3.5 tons of iron? (Hint: your mass percent conversion factors can have units of tons) *Mass percent values used in calculations should be written as conversion factors with units & labels
A student performed the identical experiment to isolate Fe, NaCl, and SiO2 in a mixture. They performed every step correctly except they extracted with 10 mL of deionized water only once rather than the recommended four times. a.) Will this error make the calculated mass percent of Fe, NaCl, and SiO2 accurate or inaccurate. Explain your answer. b.) Will the calculated mass percents of Fe, NaCl, and SiO2 be higher or lower than the true values? - Mass percent of Fe (HIGHER or LOWER) Must explain answer. - Mass percent of NaCl (HIGHER or LOWER) Must explain answer. - Mass percent of SiO2 (HIGHER or LOWER) Must explain answer.
b. silver nitrate and ammonium selenate + c. copper(II) sulfate and barium nitrate + d. calcium nitrate and sodium iodide +