Bonds/Molarity/Polarity

Question 1

What is an Ionic bond?

Answer 1

the electrostatic force between two oppositely charged ions is the bond that holds them together

Example sentence: Sodium chloride is held together by an ionic bond.

Question 2

What is a covalent bond?

Answer 2

shared pair of electrons

Example sentence: In a water molecule, oxygen and hydrogen atoms are held together by covalent bonds.

Question 3

What is a hydrogen bond

Answer 3

A polar covalent bond forms where electrons are shared unequally between atoms

Example sentence: Hydrogen bonds play a crucial role in the structure of DNA.

Question 4

What is a mole?

Answer 4

one mole of an element is the amount of that element that contains 6.022x10^23 atoms

Example sentence: The molarity of a solution can be calculated by dividing the moles of solute by the volume of the solution.

Question 5

A molar solution contains…

Answer 5

contains 1 mole of solute (substance which dissolves) in 1 dm^3of solution

Example sentence: To prepare a molar solution of sodium chloride, dissolve one mole of NaCl in one liter of water.

Question 6

Molarity formula

Answer 6

mass of substance / molar mass of substance

Example sentence: The molarity of a solution can be calculated using the formula M = n/V, where n is the number of moles of solute and V is the volume of the solution.

Question 7

What does polarity mean?

Answer 7

Polarity means that water molecules can form hydrogen bonds with other water and polar molecules.

substances consisting of polar molecules = HYDROPHILIC

Question 8

What type of molecules are considered hydrophilic?

Answer 8

Polar molecules are considered HYDROPHILIC.

Question 9

What type of molecules are considered hydrophobic?

Answer 9

Non-polar molecules are considered HYDROPHOBIC.