Answer:
These are the correct ones:
- Reduction is the gain of electrons, and oxidation is the loss of electrons
- The reactant that is oxidized is also called the reducing agent, and the reactant that is reduced is called the oxidizing agent.
Explanation:
The oxidant is reduced because it picks up electrons to oxidize another substance, while the reducing agent oxidizes because it loses electrons to be able to reduce another substance.
The sum of all the oxidation numbers in a compound is ALWAYS 0.
Covalent network solids typically have high melting points and boiling points.
The chemical formula of a network solid indicates in the molecule by a a formula unit.
Covalent-network solid is a chemical compound (or element) in which the atoms are bonded by covalent bonds in a continuous network extending throughout the material.
For example, SiO₂ is a covalent-network solid.
Silicon Dioxide has a high melting point, around 1700°C.
Silicon(IV) oxide has continuous three-dimensional network of SiO₂ units.
The average atomic mass of an element can be determined by multiplying the individual masses of the isotopes with their respective relative abundances, and adding them.
Average atomic mass of Br = 158 amu(0.2569) + 160 amu(0.4999) + 162 amu(0.2431)
Average atomic mass = 159.96 amu
As described in the problem, the relative abundance for Br-79 is 25.69%. This is because 2 atoms of Br is equal to 79*2 = 158 amu. Similarly, the relative abundance of Br-81 is 81*2 = 162, which is 24.31%.
1- savannah shouldn’t drink that toxic stuff
2- scissors shouldn’t be in the charger hole
3- there shouldn’t be a snake in the lab
4- lindsey should pay attention to what’s in front of her
5- freddy shouldn’t steal stuff
6- there shouldn’t be a plug in the water
7- evan shouldn’t drink anything in the lab
8- there shouldn’t be food in the lab
Answer:
116.1 a.m.u.
It is not likely that RCOOH is the pentanoic acid
Explanation:
Let's consider the generic neutralization between NaOH and a monoprotic carboxylic acid.
RCOOH(aq) + NaOH(aq) ⇒ RCOONa(aq) + H₂O(l)
The molar ratio of RCOOH to NaOH is 1:1. The moles of RCOOH are:

The molar mass of RCOOH is:

Thus, the molecular weight is 116.1 a.m.u.
Pentanoic acid has the formula C₅H₁₀O₂ with a molecular weight of 102.1 a.m.u. So, it is not likely that RCOOH is the pentanoic acid.