Answer:
The nucleus of an atom is made up of positively charged protons and neutrally charged neutrons. The nucleus determines which element an atom is, based on the number of protons. For example, only Oxygen has 8 protons, Carbon has 6 protons, etc. The nucleus is about 1/100,000 of the size if the whole atom.
Answer:
of sodium arsenate would be present in a 1.70 L sample of drinking water that just meets the standard.
Explanation:
Mass of sodium arsenate =x
Mass of water = M
Density of water = d = 1000 g/L
Volume of the water , V= 1.70 L
M =
1 Parts per billion = 1 μg/kg =
(1 kg =1000 g)
Moles of arsenic =
1 mole of sodium arsenate has 1 mol of arsenic atom.Then of arsenic will found in:
of sodium arsenate.
Mass of of sodium arsenate:
of sodium arsenate would be present in a 1.70 L sample of drinking water that just meets the standard.
Answer:
option b : O₉S₁₀
Explanation:
There are some points to name a covalent compound, according to that
number of atoms numbered as
**mono for one, di - for two tri for three and so on.
the name of the atom as
**carbon as carbide, sulfur as sulfide, oxygen as oxide, foulrine as flouro etc.
So,
Formula of Nonoxide decasulfide
Now Naming of the Chemical compound
Following are the explanations of terms
- Prefix nono is used for number ''9'' denoting to the number of atom
- Oxide used for oxygen
- deca is use for number ''10'' denoting to the number of atom
- Sulfide is used for Sulfur in a compound
So keeping the above points in mind
The right answer is
Option b : O₉S₁₀
Answer: endothermic
Explanation: Endothermic Reactions. A system of reactants that absorbs heat from the surroundings in an endothermic reaction has a positive (H), because the enthalpy of the products is higher than the enthalpy of the reactants of the system.
Handle of frying pan would be a
good use for a nonmetal. A nonmetal is neither a good thermal insulator nor a
good electrical conductor. Because it is neither, it can be use as a semiconductor.
It does not absorb heat that much that is why it is best in insulating.