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3 years ago

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

Chemistry

2 answers:

Vlad1618 [11]3 years ago

8 0

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

yan [13]3 years ago

3 0

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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The formula to be used for this problem is as follows:

E = hc/λ, where h is the Planck's constant, c is the speed of light and λ is the wavelength. Also 1 aJ = 10⁻¹⁸ J

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Jill then wrote the formulas for all the possible compounds that sodium can form with the other ions. What formulas did she writ

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Explanation:

Sodium has atomic number of 11 and its electronic configuration is given by:

$[Na]=1s^22s^22p^63s^1$

The nearest stable electronic configuration to sodium is of the neon. So, in order to attain stability of noble gas it will loose its single electron.

$Na\rightarrow Na^++1e^-$

$[Na^+]=1s^22s^22p^63s^0$

Sodium has single valency that is 1.

Let nbe the valency of the ion 'X'

By criss-cross method, the oxidation state of the ions gets exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.

$Na_nX_1$

So, the formulas for all the possible compounds that sodium can form with the other ions will be:

$Na_nX_1$

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Fjords are usually found where mountains exist next to the ocean.

So the correct answer is C.

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