CHEMISTRY
MIDDLE SCHOOL

energy into ___

____ and sound energy.

chemical, electrical

Olight, electrical

O

electrical, light

O heat, light

Answer:

Answer:

(a bit of heat) and light

Explanation:

it has the resistance in it so it will give heat when surpassed by a high tension

HIGH SCHOOL

In which of these samples do the molecules have the greatest kinetic energy? solid ice (-25°C)

water vapor (102°C)

ice water (0°C)

liquid water (54°C)

Water vapor

It's molecules are constantly moving without decrease

It's molecules are constantly moving without decrease

HIGH SCHOOL

What is the approximate frequency of a photon having an energy 3.2 * 10^-24 J? (h = 6.6*10^-34 J*s) a.) 48*10^9

b.) 2.1*10^-57

c.) 3.0*10^-58

d.) 2.1*10^-10

The Planck’s Equation states that

E = hv

E stands for energy measured in Joules

v stands for frequency measured in s^-1 or Hertz (Hz)- 1Hz .

h is Planck’s constant which is equivalent to 6.626x10-34 J.s

The Planck's equation states that the energy of a photon, is directly proportional to its frequency (v), by a constant factor (h).

Given:

E=3.2 * 10^-24 J

h= 6.626x10-34 J.s

Now we know that

E=hv

Thus substituting the given values we get

v=3.2 * 10^-24 /6.626x10-34

v=48 x 10^9 s^-1

HIGH SCHOOL

Dinitrogentetraoxide partially decomposes into nitrogen dioxide. A 1.00-L flask is charged with 0.0400 mol of N2O4. At equilibrium at 373 K, 0.0055 mol of N2O4 remains. Keq for this reaction is ________.

Answer:

Keq=0.866

Explanation:

Hello,

In this case, the undergone chemical reaction is:

In such a way, since 0.0055 mol of N₂O₄ remains in the flask, one infers that the reacted amount () was:

In addition, the produced amount of NO₂ is:

Finally, considering the flask's volume, the equilibrium constant is then computed as follows:

Best regards.

HIGH SCHOOL

The mass numbers for two isotopes are unequal because they have different numbers of ______ .

They have different number of neutrons.