Which of the following reactions is an acid-base reaction? A) AgNO3(aq) + KF(aq) → AgF(s) + KNO3(aq)
B) NH3(aq) + HF(aq) → NHat(aq) + F-(aq)
C) NO2(aq) + Al(s) → NH3(g) + AlO2 (aq)
D) CH2(g) + 202(g) → 2H2O(g) + CO2(g)

Why do scientists look for patterns in the world? a. patterns can explain observations. b. patterns never change, no matter what. c. patterns are easy for scientists to detect. d. patterns are all the same, through all time.

Which of the following best describes technology a. something created for only scientists to use b.the method of thinking that scientists use. c.the application of engineering to create useful products. c. a scientific idea

Which best describes the activation energy of a chemical reaction? a. the combined energy of all the reactants b. the amount of energy required for a reaction to occur c. the difference in energy between products and reactants d. the potential energy stored in the bonds of reactants and products