A cell membrane of living cells is formed by a double layer of phospholipids. Which is true about the head and tails of the individual phospholipids? a. The tails are hydrophilic and the head is hydrophobic.
b. The head is hydrophilic and the tails are hydrophobic.
c. Both the head and tails are hydrophilic.
d. Both the head and tails are hydrophobic.

What happens when an atom of sulfur combines with two atoms of chlorine to produce sci2? a. each chlorine atom shares a pair of electrons with the sulfur atom. b. an electron is transferred from each chlorine atom to the sulfur atom. c. an electron is transferred from the sulfur atom to each chlorine atom. d. each chlorine atom shares all its valence electrons with the sulfur atom.

Using the periodic table, complete the following. element: hydrogen symbol: h₂ molecular weight: g mass of one mole: g/mol

Which statement is true regarding the diagram of circle p? the sum of y and z must be 2x. the sum of y and z must be x. the difference of z and y must be 2x. the difference of z and y must be x