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 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question 15 please! I don’t understand part b of the question
Transcribed Image Text:a) What is the chemical name of this compound?
b) How many moles were in the sample provided?
c) How many molecules were in the sample provided?
14. In 1894 Lord Rayleigh removed oxygen, nitrogen, carbon dioxide, and water vapour from a
sample of air. A small quantity of gas remained. Assume this gas was a pure sample of a
monatomic element. 1.00 L of this gas had a mass of 1.63 g at 298 K and 101.3 kPa pressure.
a) Calculate the atomic mass of the element discovered by Rayleigh.
b) Name the element.
Ac) This element has a higher atomic mass than the element following it in the periodic
table. Suggest the reason for this.
15. Two aqueous solutions of acids HA and HB are prepared. Each solution has a concentration
of 0.010 M. The pH of the solution of HA is 2.0, whilst the pH of the solution of HB is 4.2.
a) Explain why the pH of these solutions differ.
b) What volume of an aqueous solution of 0.0025 M sodium hydroxide is needed to
neutralize exactly 10.9 m
NAOH
of the solution of HA?
16. The table below gives the melting points of the chlorides of seven consecutive elements A to
G in a period of the Periodic Table.
Element
A
D
F
MP of chloride (°C)
801
712
193
-68
-91
-80
-101
,413 1,3136 319.4 -96. A
a) Give one element, A to G, which could be a metal.
-112 -149
- 131.8
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