PLEASE CHECK MY ANSWERS I REALLY NEED HELP!!!!!

Heat and temperature are the same thing, but possess different units.

TRUE
FALSE -------

Molecular motion is independent of temperature and is unaffected by a change in temperature.

TRUE
FALSE--------

Which describes how a microwave transfers heat to leftover mashed potatoes?

radiation excites the motions of water molecules in the food, raising their total kinetic energy-------
the hot oven comes in contact with the cold food and heat is transferred until both are at the same temperature
heated air currents circulate around the food, transferring their kinetic energy to the food particles
spinning the food on a turntable transfers kinetic energy to the food particles

If the change in enthalpy is negative, ΔH is negative, and heat is absorbed during the change.

TRUE-------
FALSE

When concentrated sulfuric acid is added to water in a beaker, the beaker gets very warm. The temperature change indicates an exothermic process has occurred.

TRUE
FALSE-------

Which of the following describes an endothermic reaction?

Thermal energy is released by the system.
Thermal energy is absorbed by the surroundings.--------
Thermal energy is absorbed by the system.
Thermal energy is not transferred.

The unit for specific heat is J/°C.

TRUE
FALSE-------

The specific heat of a substance is 2.23 J/g·°C. If given 11.2 grams of the substance and 368 joules of heat is released, what is the change in temperature of the substance?

14.7 degrees C
73.2 degrees C-------
6.79 x 10−2 degrees C
9190 degrees C

The specific heat of a substance is 2.91 J/g·°C. If given 10.4 grams of the substance and if the temperature of the substance increases by 26 degrees Celsius, how much heat is absorbed?

790 kJ------
7.9 x 102 kJ
7.9 x 10−1 kJ
0.79 J

A calorimeter operates on which fundamental principle?

The temperature change of the fluid in the calorimeter must be measured indirectly.
The sum of the heat released and the heat absorbed equals the specific heat of the material.
The heat released when substances react or mix equals the heat absorbed by the surrounding water.
The amount of heat transferred is independent of the mass of the sample being studied.--------

Question

28-12-2017
Chemistry

contestada

PLEASE CHECK MY ANSWERS I REALLY NEED HELP!!!!!

Heat and temperature are the same thing, but possess different units.

TRUE
FALSE -------

Molecular motion is independent of temperature and is unaffected by a change in temperature.

TRUE
FALSE--------

Which describes how a microwave transfers heat to leftover mashed potatoes?

radiation excites the motions of water molecules in the food, raising their total kinetic energy-------
the hot oven comes in contact with the cold food and heat is transferred until both are at the same temperature
heated air currents circulate around the food, transferring their kinetic energy to the food particles
spinning the food on a turntable transfers kinetic energy to the food particles

If the change in enthalpy is negative, ΔH is negative, and heat is absorbed during the change.

TRUE-------
FALSE

When concentrated sulfuric acid is added to water in a beaker, the beaker gets very warm. The temperature change indicates an exothermic process has occurred.

TRUE
FALSE-------

Which of the following describes an endothermic reaction?

Thermal energy is released by the system.
Thermal energy is absorbed by the surroundings.--------
Thermal energy is absorbed by the system.
Thermal energy is not transferred.

The unit for specific heat is J/°C.

TRUE
FALSE-------

The specific heat of a substance is 2.23 J/g·°C. If given 11.2 grams of the substance and 368 joules of heat is released, what is the change in temperature of the substance?

14.7 degrees C
73.2 degrees C-------
6.79 x 10−2 degrees C
9190 degrees C

The specific heat of a substance is 2.91 J/g·°C. If given 10.4 grams of the substance and if the temperature of the substance increases by 26 degrees Celsius, how much heat is absorbed?

790 kJ------
7.9 x 102 kJ
7.9 x 10−1 kJ
0.79 J

A calorimeter operates on which fundamental principle?

The temperature change of the fluid in the calorimeter must be measured indirectly.
The sum of the heat released and the heat absorbed equals the specific heat of the material.
The heat released when substances react or mix equals the heat absorbed by the surrounding water.
The amount of heat transferred is independent of the mass of the sample being studied.--------

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Xema8 Xema8 · Answer 1 · 2019-08-23T06:58:01+02:00

Answer:

Explanation:

Heat and temperature are not the same thing. They possess different unit. So statement is false.

Molecular motion depends upon temperature . It increases with temperature. So statement is false.

Radiation excites the motion of water molecules in the food raising their kinetic energy . Water molecules being polar in nature vibrates strongly under the influence of changing electric field of em waves..

When Δ H is negative , heat is evolved so statement is false.

Due to exothermic process , heat is evolved . So statement is true.

Endothermic process indicates that thermal energy is absorbed by the system.

The unit of specific heat is J/mol.C. So statement is false.

change in temperature = heat/(mass.specific heat) = 368/2.23 x 11.2 =14.73 degree C.

From the formula above , heat absorbed = 2.91 x 10.4 x 26 = 786.86 J or 790 J

Calorimeter operates on the principle of heat absorbed is equal to heat released

rjr0112 rjr0112 · Answer 2 · 2019-10-25T01:22:25+02:00

rjr0112 rjr0112

25-10-2019

Q9 7.9 x 10−1 kJ

Q10 The amount of heat transferred is independent of the mass of the sample being studied.

just took the test

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