Question

C. Very short answer type questions
1. What does BC stand for?
2. What does AD stand for?
3. Name the two sources of history.
4. What is archaeology?​

Answer 1

Answer:

Answer: The correct answer is option (a). Explanation: The dates before the birth of Jesus Christ are expressed as BC, that is, 'Before Christ. The dates after the birth of Jesus Christ are expressed as AD, that is, 'Anno Domini'.

2 -Divide the mass of the molecular substance by its molar mass to get moles. Then multiply times 6.022×1023molecules1mol

3 -To calculate the number of atoms in a sample, divide its weight in grams by the amu atomic mass from the periodic table, then multiply the result by Avogadro's number: 6.02 x 10^23.

4 -Avogadro's number, number of units in one mole of any substance (defined as its molecular weight in grams), equal to 6.02214076 × 1023. The units may be electrons, atoms, ions, or molecules, depending on the nature of the substance and the character of the reaction (if any).

Answer 2

1. BC - Anno Domini

2. AD - Anno Domini

3. Two sources of history are

Primary and secondary sources

4. the study of the past, based on objects or parts of buildings that are found in the ground is known as archaeology.

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