I need help with this please​

The image shows a process that releases nuclear energy which statement best identifies the process shown the process must be fusion because energy is released the process must be fusion because of have your nucleus formed a smaller nuclei the process must be fission because a large nucleus breaks into smaller nuclei the process must be fission because neutrons are formed

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?