Describe your observations of the original solutions. describe your observations when the silver nitrate was added to the sodium chloride solution. did a chemical reaction occur? why do you think so? describe your observations when the silver nitrate was added to the potassium chromate solution. did a chemical reaction occur? why do you think so? describe your observations when the sodium chloride was added to the result of the potassium chromate and silver nitrate solutions. did a chemical reaction occur? why do you think so?

Here we have to get the reaction between the given sample in each step and justification needed for each of the reaction.

1. The color of silver nitrate (AgNO₃) and sodium chloride (NaCl) solutions are colorless.  The color of potassium chromate (K₂CrO₄) solution is yellow-orange. And all of the solutions are clear.

2. On addition of AgNO₃ to NaCl the following reaction happens:

AgNO₃ (s) + NaCl (s) = AgCl↓ + NaNO₃ (s).

In this reaction we get a white precipitation of silver chloride (AgCl). As the state of the solution changes i.e. colorless to white precipitate there must be a reaction happened.

3. On addition of AgNO₃ to K₂CrO₄ the following reaction happens:

2AgNO₃ (s) + K₂CrO₄ (s) = Ag₂CrO₄↓ + 2KNO₃ (s). In this reaction a brown red precipitation occurs.

As in this reaction the state of the chemicals changes from liquid to solid with a distinguish change of color there must be a chemical reaction happens.

4. If NaCl solution added to the mixture of AgNO₃ and K₂CrO₄ solution i.e. Ag₂CrO₄ then the red brown precipitate of Ag₂CrO₄ will change to white AgCl precipitate.

The reaction is Ag₂CrO₄ + 2NaCl = 2AgCl↓ + Na₂CrO₄. As in this reaction the color of the precipitate changes thus there must be a chemical reaction happens.

Explanation:

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

a electronegativity decreases beacuse the size of nucleus is bigger.