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Mathieu Shields

Mathieu S.

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Without consulting a table of standard molar entropies, predict whether $\Delta S_{\text {system }}^{\circ}$ will be positive or negative for each of these reactions. (a) $2 \mathrm{NH}_{3}(\mathrm{~g}) \longrightarrow \mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g})$ (b) $2 \mathrm{Na}(\mathrm{s})+\mathrm{Cl}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{NaCl}(\mathrm{s})$ (c) $\mathrm{H}_{2}(\mathrm{~g})+\mathrm{I}_{2}(\mathrm{~s}) \longrightarrow 2 \mathrm{HI}(\mathrm{g})$

Chemistry: The Molecular Science

Without consulting a table of standard molar entropies, predict whether $\Delta_{1} S_{\text {system }}^{\circ}$ is positive or negative for each of these reactions. (a) $2 \mathrm{NH}_{3}(\mathrm{~g}) \longrightarrow \mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g})$ (b) $2 \mathrm{Na}(\mathrm{s})+\mathrm{Cl}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{NaCl}(\mathrm{s})$ (c) $\mathrm{H}_{2}(\mathrm{~g})+\mathrm{I}_{2}(\mathrm{~s}) \longrightarrow 2 \mathrm{HI}(\mathrm{g})$

Without consulting a table of standard molar entropies, predict whether $\Delta_{1} S_{\text {system }}^{\circ}$ is positive or negative for each of these reactions. (a) $2 \mathrm{NH}_{3}(\mathrm{~g}) \longrightarrow \mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g})$ (b) $2 \mathrm{Na}(\mathrm{s})+\mathrm{Cl}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{NaCl}(\mathrm{s})$ (c) $\mathrm{H}_{2}(\mathrm{~g})+\mathrm{I}_{2}(\mathrm{~s}) \longrightarrow 2 \mathrm{HI}(\mathrm{g})$

Chemistry The Molecular Science

Questions asked

ANSWERED

Timothy James verified

Numerade educator

a) Describe constructive interference of two waves. [2 marks] b) If a spring stretches from 12 cm to 16 cm when a mass of 2.4 kg is suspended from it, calculate the spring constant. [3 marks] c) A car of mass 1000 kg had its springs compressed vertically by 2.6 cm when a driver of mass 62 kg climbed into it. If damping is ignored what is the frequency of vibration when the car hits a bump while driving? [5 marks]

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Penny Riley verified

Numerade educator

A small body of mass 180 g undergoes SHM with amplitude 18 cm, and frequency of 0.5 Hz. a) What is the total distance it travels in 12 sec? [3 marks] b) Calculate the spring constant. [3 marks] c) What is the maximum potential energy of this system?

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H M verified

Numerade educator

c) A heat engine produces 30, 000 J of mechanical work per second of operation. If its efficiency is 25% how much heat is discharged from this engine per second?

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Krystal K verified

Numerade educator

c) The force between two electrical charges is 0.4 N. What would be the force if the charges are doubled, and the distance between them increased by 100%?

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Ivan Kochetkov verified

Numerade educator

A 12 V battery with internal resistance of 1.0 Ohm when placed in a circuit with a 4 Ohm resistor, which is in series with an unmarked resistor, gives a current of 2 Amps. a) Calculate the value of the unmarked resistor. [5 marks] b) If the two resistors are placed in parallel find the value of: I. The current in the circuit [3 marks] II. The power used in the circuit. [2 marks]

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ANSWERED

Stephen Zaffke verified

Numerade educator

A 12 V battery with internal resistance of 1.0 Ohm when placed in a circuit with a 4 Ohm resistor, which is in series with an unmarked resistor, gives a current of 2 Amps. a) Calculate the value of the unmarked resistor. [5 marks] b) If the two resistors are placed in parallel find the value of: I. The current in the circuit [3 marks] II. The power used in the circuit. [2 marks]

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