Which of these is a typical property of a substance that is composed of atoms that are held together by covalent bonds?a. It conducts electricity when in solid form.
b. It conducts electricity when in molten form.
c.It conducts electricity when it is dissolved in water.
d.It does not conduct electricity in any form.

Answers

Answer 1

Answer: electricity is conducted by free electrons or ions, such as delocalised electrons in metallic compounds or free moving cations and anions in aqueous solutions of ionic compounds.

atoms held together by covalent bonds do not contain free moving electrons or ions, so they do not conduct electricity in any state.

Answer 2

Answer:

Answer:

D) It does not conduct electricity in any form.

Explanation:

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The bright-red color of highway safety flares comes from strontium ions in salts such as Sr(NO3)2 and SrCO3. Burning a flare produces strontium ions in excited states, which then emit red photons at 606 nm and several wavelengths between 636 and 688 nm. Calculate the energy (in Joules per mole) of the 649 nm emission.

Answers

Answer:

E = 1.8 x 10⁵ J/mol

Explanation:

We are being asked the enery per mol for an emission line corresponding to 649 nm.

The energy of a photon is given by the porduct of Planck's contant times the frequency of the radiation,

E = hν

We also know that the frequency is given by

ν = c/λ

where c is the speed of light (3 x 10 ^8 m/s) and λ is 649 nm given in the problem. Therefore the energy per photon will be given by

E= hc/λ = 6.626 x 10⁻³⁴Js x 3 x 10 ^8 m/s/ 649 x 10 ⁻⁹ m

E = 3.1 x 10 ⁻¹⁹ J/ photon

(Note the wavelength has to be in nanometers (1nm= 10⁻⁹ m) and that the energy we get is the energy per a single photon. Thus we will need to multiply this result by Avogadro's number to answer this question.

E = 3.1 x 10 ⁻¹⁹ J/ photon x 6.022 x 10 ²³photon/mol

E = 1.8 x 10⁵ J/mol

Final answer:

The energy of the 649 nm emission from strontium ions in a flare is approximately 1.83 x 10⁵ Joules per mole. This calculation is done using the formula for energy of a photon and converting it to energy per mole using Avogadro's number.

Explanation:

The energy of a single photon can be calculated using the equation E=hc/λ, where h is Planck's constant (6.626 x 10⁻³⁴ J.s), c is the speed of light (3.00 x 10⁸ m/s), and λ is the wavelength of the light in meters. First, let's convert the wavelength from nanometers to meters, which results in 649 x 10⁻⁹ m.

Putting these values into the equation, we get E= (6.626 x 10⁻³⁴ J.s x 3.00 x 10⁸ m/s) / (649 x 10⁻⁹ m). The calculated value is about 3.05 x 10⁻¹⁹ J. However, the question asks for the energy in joules per mole. Multiplying this value by Avogadro's number (6.022 x 10²³ mol⁻¹), we get about 1.83 x 10⁵ J/mol.

Therefore, the energy of the 649 nm emission from strontium ions in a flare is approximately 1.83 x 10⁵ Joules per mole.

Learn more about Photon Energy Calculation here:

brainly.com/question/5121707

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How does the speckled coat of a young deer help it to survive?A) The speckled coat is a form of mimicry.
B) This is a physical adaptation that helps a doe recognize her fawn.
C) The pattern of the speckled coat is used as a form of warning coloration.
D) The speckled coat blends with the light that filters through the forest leaves.

Answers

the answer is D, The speckled coat helps them camouflage into the environment

Answer:

The answer is D

Explanation:

What mass of iron (II) sulfate is found in 75 mL of a 5% w/v solution?