Answer:
The correct answer is TRUE.
A legend or key is defined an the element of a graph, that is introduced to provide additional information that helps the reader to interpret the information represented by the graph. It is not mandatory to include it but, in some cases, it is quite likely that the graph is not properly understood otherwise.
Based on the excerpt, President Jimmy Carter made reference to the meeting he had with various leaders on the energy crisis.
<h3>What is a state crisis?</h3>
A state crisis can be defined as any form of event that has the potential of causing an unstable and dangerous situation across a country, thereby, adversely affecting the people that are living within it.
In this scenario, the United States of America had an energy crisis while Jimmy Carter was the president. Thus, President Jimmy Carter gave a speech on the 15th of July, 1979 to address the citizens of the United States of America on their energy crisis through a live TV broadcast.
Read more on Jimmy Carter here: brainly.com/question/23775670
The only reaction that will most likely take place based on the activity series is; C: Ba + Na₂CO₃
<h3>Activity Series</h3>
From the activity series given, we can say that during a displacement reaction, the more reactive metal will always displace the lesser reactive metal from a compound.
Let us look at each of the given options;
A) Ag + FeCl₃
From the activity series, Silver(Ag) is less reactive than Iron(Fe) and as such Silver cannot displace iron from its' compound.
B) Zn + CaO
Zinc (Zn) is a less reactive metal than Calcium (Ca), so it cannot cannot displace Calcium from its' compound.
C) Ba + Na₂CO₃
Barium (Ba) is a more reactive metal than Sodium (Na), and therefore Barium will displace sodium from its compound in a displacement reaction.
D) Cr + KNO₃
Chromium (Cr) is a lesser reactive metal than Potassium (K), and it therefore cannot displace Potassium from its compound.
Complete question is;
Which reaction will most likely take place based on the activity series? Li > K Ba > CaNa > Mn > Zn > Cr> Fe> Cd Ni > H > Sb > Cu > Ag > Pd > Hg > Pt
A. Ag + FeCl₃
B. Zn + CaO
C. Ba + Na₂CO₃
D. Cr + KNO₃
Read more about Activity Series at; brainly.com/question/17469010
