3) Which of the following is a true statement

What is the mass of chlorine in 3.9 x 1019 molecules of Cl2?

Ray Of Light [21]

Explanation:

A photon is a quantum of EM radiation. Its energy is given by E = hf and is related to the frequency f and wavelength λ of the radiation by

E=hf=hcλ(energy of a photon)E=hf=hcλ(energy of a photon),

where E is the energy of a single photon and c is the speed of light. When working with small systems, energy in eV is often useful. Note that Planck’s constant in these units is h = 4.14 × 10−15 eV · s.

Since many wavelengths are stated in nanometers (nm), it is also useful to know that hc = 1240 eV · nm.

These will make many calculations a little easier.

All EM radiation is composed of photons. Figure 1 shows various divisions of the EM spectrum plotted against wavelength, frequency, and photon energy. Previously in this book, photon characteristics were alluded to in the discussion of some of the characteristics of UV, x rays, and γ rays, the first of which start with frequencies just above violet in the visible spectrum. It was noted that these types of EM radiation have characteristics much different than visible light. We can now see that such properties arise because photon energy is larger at high frequencies.

3 0

3 years ago

What is Acid ?<br>please don't report , don't give link and give the correct answer .

VladimirAG [237]

Answer:

Below in Bold

✧ $\underline{ \underline{ \red{ \large{ \tt{E \: X \: P \: L \: A \: N \: A \: T \: I \: O \: N}}}} }:$

♨ The word ' acid ' is derived from the Latin word ' acidus ' which means sour. An acid is defined as the substance which gives hydrogen ions or protons ( H+ ) when dissolved in water. For example :

Hydrochloric acid
Sulphuric acid
Nitric acid
Carbonic acid
Acetic acid

✎ $\underline{ \underline{ \purple{ \large{ \tt{Extra \: Info}}}}} :$

☃ Physical properties :

Acids have a sour taste. But some acids like steric acid, boric acid , salisylic acid do not have a sour taste. Laboratory acids are more corrosive , so they are dangerous to taste.
Acid turn blue colour of litmus paper into red and light yellow methyl orange into red. They make phenolphthalein colourless.

☂ Chemical properties :

Acids have a high dissolving power and dissolve many substances. Some metals like zinc and magnesium react with acids like dilute sulphuric acid and dilute hydrochloric acid to produce salt and hydrogen gas.
Acid react with base to give salt and water.
Acid gives H+ ions when dissolved in water.
Acid react with metallic carbonates to produce carbon dioxide.

☼ Hope I helped! ♡

Have a wonderful day / night ! ツ

☥ $\underbrace{ \overbrace{ \mathfrak{Carry \:On \: Learning}}}$