A chemist mixes sodium with water and witnesses a violent reaction between the metal and water. This is best classified as a) an observation b) a law c) a hypothesis d) a theory
A chemist mixes sodium with water and witnesses a violent reaction between the metal and water. This is best classified as a) an observation b) a law c) a hypothesis d) a theory
A chemist mixes sodium with water and witnesses a violent reaction between the metal and water. This is best classified as
a) an observation
b) a law
c) a hypothesis
d) a theory
Expert Solution & Answer
Interpretation Introduction
Introduction: The scientific approach to knowledge is empirical and is based on observations and experiments. Most of the observations are quantitative (taking measurements or quantifying something regarding the process) but some of them are qualitative (description of a process) also.
Answer to Problem 1SAQ
(a) The violent reaction witnessed by a chemist on mixing sodium with water is best classified as an observation. Hence, option (a) is correct.
Explanation of Solution
Observation is generally regarded as an act to sense the external real objects.
Theory can be described as a scientific explanation of an observed activity or a phenomenon. It explains the observations or events that are based upon any proven hypothesis.
A law is a description of an observed phenomenon or activity. It is generally regarded as a statement of fact.
A hypothesis is a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
In this case, there is a violent reaction that is observed. So, it is an observation.
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What are the IUPAC Names of all the compounds in the picture?
1) a) Give the dominant Intermolecular Force (IMF) in a sample of each of the following
compounds. Please show your work. (8) SF2, CH,OH, C₂H₂
b) Based on your answers given above, list the compounds in order of their Boiling Point
from low to high. (8)
19.78 Write the products of the following sequences of reactions. Refer to your reaction road-
maps to see how the combined reactions allow you to "navigate" between the different
functional groups. Note that you will need your old Chapters 6-11 and Chapters 15-18
roadmaps along with your new Chapter 19 roadmap for these.
(a)
1. BHS
2. H₂O₂
3. H₂CrO4
4. SOCI₂
(b)
1. Cl₂/hv
2. KOLBU
3. H₂O, catalytic H₂SO4
4. H₂CrO4
Reaction
Roadmap
An alkene 5. EtOH
6.0.5 Equiv. NaOEt/EtOH
7. Mild H₂O
An alkane
1.0
2. (CH3)₂S
3. H₂CrO
(d)
(c)
4. Excess EtOH, catalytic H₂SO
OH
4. Mild H₂O*
5.0.5 Equiv. NaOEt/EtOH
An alkene 6. Mild H₂O*
A carboxylic
acid
7. Mild H₂O*
1. SOC₁₂
2. EtOH
3.0.5 Equiv. NaOEt/E:OH
5.1.0 Equiv. NaOEt
6.
NH₂
(e)
1. 0.5 Equiv. NaOEt/EtOH
2. Mild H₂O*
Br
(f)
i
H
An aldehyde
1. Catalytic NaOE/EtOH
2. H₂O*, heat
3. (CH,CH₂)₂Culi
4. Mild H₂O*
5.1.0 Equiv. LDA
Br
An ester
4. NaOH, H₂O
5. Mild H₂O*
6. Heat
7.
MgBr
8. Mild H₂O*
7. Mild H₂O+
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