Polytechnic Chemistry 1

Question 1

What is the atomic number of carbon?

Accepted Answer

6

Answer

Carbon has an atomic number of 6, meaning it has 6 protons in its nucleus.

Question 2

What is the pH of a neutral solution at 25°C?

Accepted Answer

7

Answer

A neutral solution at 25°C has a pH of 7, where hydrogen ion concentration equals hydroxide ion concentration.

Question 3

What type of bond forms between atoms with high electronegativity difference?

Accepted Answer

Ionic bond

Answer

Ionic bonds form when one atom donates electrons to another due to a large electronegativity difference (typically > 1.7).

Question 4

What is Avogadro's number?

Accepted Answer

6.022 × 10²³

Answer

Avogadro's number is 6.022 × 10²³, representing the number of particles in one mole of a substance.

Question 5

Which element has the chemical symbol Na?

Accepted Answer

Sodium

Answer

Na is the chemical symbol for sodium, derived from its Latin name 'Natrium'.

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