Cells and Chemistry Fundamentals

What are the 4 most abundant elements found in organisms?

• carbon, helium, oxygen, silicon

• carbon, hydrogen, oxygen, silicon

• calcium, hydrogen, oxygen, nitrogen

• carbon, hydrogen, oxygen, nitrogen

True or false? A covalent bond is formed between a metal and a non-metal, or a non-metal and a non-metal.

• True

• False

True or false? An element is the smallest unit of an atom.

• True

• False

Which of the below is a compound?

• carbon

• H₂O

• O₂

• iron

This is an atom or a group of atoms that have a positive or negative charge.

• ion

• compound

• element

• non-polar

Why are ions important in your body?

• they help with muscle contraction

• they keep you from sweating too much

• they determine your hair colour

• they are poisonous and you must not consume them

2Na + Cl₂ → 2NaCl

• the reactant is salt

• the reactant is chlorophyll

• the product is sodium

• none of the above

Is energy absorbed or released in photosynthesis?

• absorbed

• released

Which of the following is hydrophilic?

• salt

• wax

• olive oil

Which of the following is hydrophobic?

• glucose

• table salt

• vegetable oil