30 points for 3 questions. the answer with all correct will get brainliest! ! 1.) which is a false statement about vinegar? a. it is a pure substance. b. it is physically combined. c. it is made up of more than one pure substance. d. it is capable of being separated into its original components by physical means. 2.) air is made up of about 21% oxygen and 78% nitrogen. in this solution, oxygen is the and nitrogen is the a. solute; solvent b. solvent; solute c. element; compound d. compound; element 3.) 5 g of sugar is dissolved in 50 g of water. what is the mass of the sugar water? a. 45 g b. 50 g c. 55 g d. 60 g

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.

If you burn 46.6 g of hydrogen and produce 416 g of water, how much oxygen reacted

What is the predicted change in the boiling point of water when 1.50 g of barium chloride is dissolved in 1.50 kg of water?