Question

Substance A has a higher specific heat than substance B. With all other factors equal, which requires the most energy to heat equal masses of A and B to the same temperature

Answer 1

Substance A
Substance B
Both require the same amount of heat.
Answer depends on the density of each substance

Answer 2

please help

Answer 3

@Michele_Laino

Answer 4

the amount Q of heat, of an object, is given by the subsequent formula:
\[Q = c \cdot m \cdot \Delta t\]
where c is the specific heat, m is the mass of the object and delta_t is the change in temperature of that object

Answer 5

ok. so what next @Michele_Laino

Answer 6

so, if
\[\Large\begin{gathered}
{m_A} = {m_B} \hfill \\
\Delta {t_A} = \Delta {t_B} \hfill \\
{c_A} > {c_B} \hfill \\
\end{gathered} \]
what we can conclude?

Answer 7

Substance A is greater?

Answer 8

meaning substance b require more energy. right?

Answer 9

I think that the amount of heat of substance A is greater than the one of the substamce B

Answer 10

substance*

Answer 11

ok. got it. that means option a right?

Answer 12

yes!

Answer 13

should i post the other questions sir?

Answer 14

ok! nevertheless, as I said before, you have to wait

Answer 15

With all other factors equal, the most likely to burn your mouth when taken directly from an oven is a food with
higher specific heat.
lower specific heat.
specific heat is not important in this situation.
more information needed.

4 A large and a small container of water with the same temperature have
the same total amounts of internal energy.
the same amounts of internal and external energy.
different amounts of heat.
the same amounts of all forms of energy.

5 As a solid goes through a phase change to a liquid, heat is absorbed and the temperature
increases
decreases
remains the same
fluctuates.

6 Anytime a temperature difference occurs, you can expect
cold to move to where it is warmer.
energy movement from higher temperature regions
no energy movement unless it is warm enough, at least above the freezing temperature
energy movement flowing slowly from cold to warmer regions.

7 No water vapor is added to or removed from a sample of air that is cooling, so the relative humidity of this sample of air will
remain the same.
be lower.
be higher.
the answer depends on the temperature.

8 Temperature is
a form of heat transfer where energy is radiated in the form of rays.
a form of heat transfer.
a form of energy contained in an object associated with the motion of molecules.
a measure of the hotness or coldness of an object.

9 The amount of heat necessary to change an object's temperature 1 kg 1°C is called
fusion.
temperature.
radiant heat.
specific heat.

10 Expansion joints are used for materials that easily expand and contract depending upon its temperature. How much expansion can take place for a brass pipe 25.8 m long that experiences temperature changes of 75.2°C?
3.44 cm
5.90 cm
3.69 cm
1.23 cm

11 Average kinetic energy of molecules is
Inversely proportional to absolute temperature
Independent of absolute temperature
Directly proportional to absolute temperature
Directly proportional to square root of temperature

12 The specific heat of a gas in isothermal process is ?
0
Negative
constant
Infinite

13 Latent heat of ice is ?
Less than external latent heat of fusion
Equal to external latent heat of fusion
More then external latent heat of fusion
Twice the external latent heat of fusion

14 The r.m.s. velocity of the molecules in the sample of helium is 5/7th that of the molecules in the sample of hydrogen. If the temperature of the hydrogen sample is 0°C that of helium is
0°C
0°K
273°C
100°C

15 Mean square velocity of five molecules of velocities 2 m/s, 3 m/s, 4 m/s, 5 m/s and 6 m/s is in
m2/s2
?
10
18
20
15

16 The difference between the principal specific heats of nitrogen is 300 J/kg °K and ratio of the two specific heats is 1.4. then the CP is
1050 J/kg °K
650 J/kg °K
750 J/kg °K
150 J/kg °K

17
CP
and
CV
denote the molar specific heats of a gas at constant pressure and at constant volume respectively. If and
CP/CV=γ,
then
CV
is equal to
R/(γ−1)
(γ−1)/R
Nosolution
373.2oC

18 A gas is taken in a sealed container at 300 K. it is heated at constant volume to a temperature 600 K. the mean K.E. of its molecules is
Halved
Doubled
Tripled
Quadrupled

19 R.M.S velocity of a gas molecule of mass m at given temperature is proportional to
mo
m
m1/2
1/m1/2

20 The mean kinetic energy of one gram-mole of a perfect gas at absolute temperature T is
0.5kT
0.5RT
1.5kT
1.5RT

Answer 16

question #11
hint:
the mean square speed of the molecules, is given by the subsequent formula:

\[v = \sqrt {\frac{{3RT}}{M}} \]
where M is the molecular mass of the gas, R is the gas constant, and T is the absolute temperature

Answer 17

please continue

Answer 18

@GIL.ojei

Answer 19

are you ready?

Answer 20

yap sir

Answer 21

@Michele_Laino

Answer 22

ohhhhhh. why did you go offline .............