What type of reaction is Pb + AgNO3 = Ag + Pb(NO3)2

Pl help
Is it synthesis, decomposition, single replacement or double replacement

In a copper wire, a temperature increase is the result of which of the following

Use the half-reactions of the reaction au(oh)3 + hi -> au +i2 +h2o to answer the questions

Which statement explains which component is likely to be more powerful in explaining a scientific phenomenon? a) component c, because a theory is often passed on possibility and not certainty b) component d, because a hypothesis is often based on possibility not certainty c) component c, because the ability to explain several occurrences in the natural world is a characteristic of a hypothesis d) component d, because the ability to explain several occurrences in the natural world is a characteristic of a theory