Which of the following mixtures may be act as a buffer solution?

a) hbr, nabr
b) hf, naf
c) hcl, nacl
d) hi, nai

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled

Which of the following are sources of revenue for media companies? a. direct sales to producers b. advertising and subscriptions c. online purchase d. capital investments

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy