Which of the following chemical reactions is a single displacement reaction? A. 2Na + O2
Na o
B. Pb(NO3)2 + 2KBr → PbBr2 + 2KNO3
C. 2Fe(OH)3 Fe2O3 + 3H20
D. 2A1 + 3Zn(NO3)2 2AI(NO3)3 + 3Zn

6. what does the symbol ah stand for? o one calorie given off by a reaction the specific heat of a substance the heat capacity of a substance the heat of reaction for a chemical reaction

What is the molar mass of a gas that has density of 2.054 g/l

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i