Which of the four solutions is the best buffer against addition of acid or base?

a. na2hpo4

b. na2hpo4 + nah2po4

c. nah2po4

d. h2o submit for grading save and finish later?

What is an everyday example of force-at-a-distance?

A chemist reacted 17.25 grams of sodium metal with excess chlorine gas. The chemical reaction is as follows Na + Cl2 → NaCl If the percentage yield of the reaction is 88%, what is the actual yield?

What is the general goal of the scientific method?

A piece of iron metal is heated to 155 degrees C and placed into a calorimeter that contains 50.0 mL of water at 18.7 degrees C. The temperature of the water rises to 26.4 degrees C.

How do cm3 compare to mililiters

Look at the reaction below. Upper H subscript 2 upper S upper O subscript 4 (a q) plus upper Upper M g (s) right arrow Uper M g upper S upper O subscript 4 (a q) plus upper H subscript 2 (g). Which substance is the acid in the reaction?

A chemical reaction can start when enough activation energy is added to the reactants. Do you think the activation energy for chemical reactions in living things is high or low / Explain your answer

Hardness of metals can be decreased by: (a) adding interstitial alloying elements (b) making glassy metals through extremely high cooling rates (c) annealing using slow cooling from high temperatures (d) cold-working or deforming at low temperatures

What happens to the reactivity of metals from left to right across the periodic table?

Does my body get all its energy from the sun?