Burning wood
dissolving salt in water
<span>mixing acid and base</span>
Answer:rubidium is the second most reactive metal so it is more reactive than hydrogen
Explanation:
Answer:
I believe it's mass? I may be wrong though...
Answer: The chemical formula of carbon dioxide is 
Explanation:
Chemical formula of any compound is the representation when elements combine with each other.
Carbon dioxide is a covalent compound and covalent compound is formed by the sharing of electrons between two elements that form a bond.
Electronic configuration of carbon: 
Carbon need 4 electrons to complete its octet.
Electronic configuration of oxygen: 
Oxygen need 2 electrons to complete its octet.
Hence, 2 oxygen atoms are required to complete the octet of 1 carbon atom. Hence, form a compound carbon dioxide 
Answer 1 is correct because 1 atm =10^5 so 1.25 atm will be equal to 1.25 *10 ^5