Answer:
1. decomposition
2. combustion
3.single replacement
4. combination
5. double replacement
Explanation:
1. one compound is split into 2 elements
2. co2 and h20 was the product of the reaction
3. cu is replaced with co
4. 2 compounds become one compound
5. ca is replaced with na and na is replaced with ca
Most covalent compounds have relatively low melting points and boiling points. Covalent compounds usually have lower enthalpies of fusion and vaporization than ionic compounds. Covalent compounds tend to be more flammable than ionic compounds. When dissolved in water, they don't conduct electricity.
Source: https://socratic.org/questions/what-are-the-main-properties-of-covalent-compounds
Answer: i really dont know srry
Explanation:
Oxygen is always -2 and Hydrogen is always +1. For the compound to be overall have a charge of zero, all the charges have to add to zero.
1 + x + 3(-2) = 0
1 + x -6 = 0
-5 + x = 0
x = +5