23. Salt A and salt B were dissolved separately in 100-milliliter beakers of water. The water temperatureswere méasured and recorded as shown in the table below:Salt ASalt BInitial water temperature: 25.1°CFinal water temperature:25.1°C20.0°C30.2°CWhich statement is a correct interpretation of these data?a) The dissolving of only salt A was endothermicb) The dissolving of only salt B was exothermicc) The dissolving of both salt A and salt B was endothermicđ) The dissolving of salt A was exothermic and the dissolving of salt B was endothermic24. The graph to the right represents the uniform cooling of a substance, starting with the substance as agas above its boiling point. How much time passes between the first appearance of the liquid phase ofthe substance and the presence of the substance completely in its solid phase?a) 5 minutesb) 2 minutesc) 7 minutesd) 4 minutese) impossible to tell from the information given150-100-50-01+23 4 5 6 7 8 9 10 11 12 13 1425. The correct formula for Iron (III) Oxide is:*...Time (minutes)A) FeO3B) Fe2O3C) Fe30D) Fe30236. A student measures the speed of Yellow Light in water to be 1.87 x 10° m/s, 1.88 x 108 m/s, and1.86 x 10° m/s. If the accepted value for the speed is 2.25 x 10% m/s, which best describes the student'smeasurements?a) accurate onlyb) precise onlyc) both precise and accurated) neither precise nor accurateTemperature (°C)

Since you have posted multiple questions, we are entitled to answer the first only.

Salt A and salt B were dissolved separately in 100-milliliter beakers of water. The water temperatures were mėasured and recorded as shown in the table below: Salt A Salt B Initial water temperature: 25.1°C Final water temperature: 25.1°C 20.0°C 30.2°C Which statement is a correct interpretation of these data? a) The dissolving of only salt A was endothermic b) The dissolving of only salt B was exothermic c) The dissolving of both salt A and salt B was endothermic đ) The dissolving of salt A was exothermic and the dissolving of salt B was endothermic

Salt A and salt B were dissolved separately in 100-milliliter beakers of water. The water temperatures were mėasured and recorded as shown in the table below: Salt A Salt B Initial water temperature: 25.1°C Final water temperature: 25.1°C 20.0°C 30.2°C Which statement is a correct interpretation of these data? a) The dissolving of only salt A was endothermic b) The dissolving of only salt B was exothermic c) The dissolving of both salt A and salt B was endothermic đ) The dissolving of salt A was exothermic and the dissolving of salt B was endothermic

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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Concept explainers

Thermochemistry

Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.

Exergonic Reaction

The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.

Question

23. Salt A and salt B were dissolved separately in 100-milliliter beakers of water. The water temperatures
were méasured and recorded as shown in the table below:
Salt A
Salt B
Initial water temperature: 25.1°C
Final water temperature:
25.1°C
20.0°C
30.2°C
Which statement is a correct interpretation of these data?
a) The dissolving of only salt A was endothermic
b) The dissolving of only salt B was exothermic
c) The dissolving of both salt A and salt B was endothermic
đ) The dissolving of salt A was exothermic and the dissolving of salt B was endothermic
24. The graph to the right represents the uniform cooling of a substance, starting with the substance as a
gas above its boiling point. How much time passes between the first appearance of the liquid phase of
the substance and the presence of the substance completely in its solid phase?
a) 5 minutes
b) 2 minutes
c) 7 minutes
d) 4 minutes
e) impossible to tell from the information given
150-
100-
50-
01+23 4 5 6 7 8 9 10 11 12 13 14
25. The correct formula for Iron (III) Oxide is:
*...
Time (minutes)
A) FeO3
B) Fe2O3
C) Fe30
D) Fe302
36. A student measures the speed of Yellow Light in water to be 1.87 x 10° m/s, 1.88 x 108 m/s, and
1.86 x 10° m/s. If the accepted value for the speed is 2.25 x 10% m/s, which best describes the student's
measurements?
a) accurate only
b) precise only
c) both precise and accurate
d) neither precise nor accurate
Temperature (°C)

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