Chemistry

What is a covalent bond?

A bond formed when atoms share electrons. view more

What is the most abundant element in the universe?

Hydrogen Makes up about 75% of all normal matter by mass. view more

What is Avogadro's number?

6.022 × 10²³ This is the number of particles (atoms, molecules, ions) in one mole of any substance. view more

What is the chemical formula for water?

H₂O Each water molecule contains: - 2 hydrogen atoms - 1 oxygen atom Molecular weight: ~18 g/mol The bent molecular shape gives water its unique properties (polarity, high boiling point). view more

What is an ionic bond?

A bond formed by electron transfer between atoms. view more

What is the pH of pure water?

pH 7 (neutral) The pH scale: - 0-6: Acidic - 7: Neutral - 8-14: Basic (alkaline) Pure water has equal concentrations of H⁺ and OH⁻ ions. view more