Question

Color Changes

For this week’s assignment, please answer EACH of the following questions/prompts,and post them to the drop box as a single document.

What three particles make up every atom?

What are the major differences among the three particles that make up every atom?

What is the relationship between a photon and a quantum leap?

Using the periodic table, determine the result of the following calculation: the number of electrons in the outer shell of a hydrogen atom minus the number of electrons in the outer shell of a helium atom plus the number of electrons in the outer shell of a hydrogen atom.

When is an electron a valence electron? Why are valence electrons especially important in chemical reactions?

Are the following substances acid, base, or neutral:

sodium bicarbonate (pH = 8.3):

Blood (pH = 7.4):

milk (pH =6.7):

orange juice (pH = 3.6):

milk of magnesia (pH = 10.5):

When your body metabolizes the food you eat, are the chemical reactions endothermic or exothermic?

When a chemical reaction takes place, it is noted that the temperature in the environment of the reaction drops. Is the chemical reaction endothermic or exothermic?

Why does ice float when placed in water?
What roles do hydrogen bonding plan in this phenomena?

What information does the octane rating of a fuel provide?
When is a fuel with a high octane rating necessary?

NO PLAGIARISM!!!!! IN YOUR OWN WORDS!!!!!

Answer 1

1. Proton, neutron, electron

2. Major difference-

* proton( positive charge) and electron (negative charge) have charge where neutron dont have any charge

* proton and neutron present into the nucleus where eletrons present outside the nucleus.

3. When an electron jumps into a ground state from a excited state it release energy in the form of raditions and these units called photon.

4. Electron in outer shell of H = 1

Electron in outer shell of He = 2

So, 1-2+1 = 0

5. The electrons present in the outermost energy level of an atom called valence electrons.these are important because when reactions occurs between the atoms then these valancy electrons participates and reaction occurs.

6. Basic

Slightly basic

Slightly acidic

Acidic

Basic

7. Exothermic

8. Endothermic

9. Because ice is light weighted and have less volume than water.

Role of H bond - hydrogen bond is weak in water and strong in ice where is hold the negative charge when temperature goes down 4°C.

10. It varies with compression ratio, geometrical and mechanical consideration and operating conditions. The higher the octane number the greater the fuel's resistance.

When compression ratio is high then high octane rating is necessary.