Water, Hydrogen, and Carbon (OCR A-Level Biology A): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
Which four elements make up approximately 99% of all living organisms?
Which four elements make up approximately 99% of all living organisms?
Carbon, hydrogen, oxygen, nitrogen
In a water molecule, which atom carries a slight negative charge (δ⁻)?
In a water molecule, which atom carries a slight negative charge (δ⁻)?
Oxygen atom
Hydrogen bonds in water form between which parts of adjacent molecules?
Hydrogen bonds in water form between which parts of adjacent molecules?
Slightly positive H & slightly negative O
Why does ice float on liquid water?
Why does ice float on liquid water?
Ice is less dense than liquid water
What term describes substances that cannot dissolve in water and are repelled by it?
What term describes substances that cannot dissolve in water and are repelled by it?
Hydrophobic
What is cohesion in relation to water molecules?
What is cohesion in relation to water molecules?
Water molecules attracted to each other
How many bond sites does a carbon atom have for forming covalent bonds?
How many bond sites does a carbon atom have for forming covalent bonds?
Four
What is a polymer?
What is a polymer?
Large molecule from many monomers
What is released when monomers join in a condensation reaction?
What is released when monomers join in a condensation reaction?
One water molecule
What happens when sucrose undergoes hydrolysis?
What happens when sucrose undergoes hydrolysis?
One glucose & one fructose are released