A) Take a very spicy chilli and chew it it will clear up
b) Drink hot water
c) Take medicine
d) Exercise for a long time till it makes you drench it helps
You can find the oxidation number of a certain element in a compound if you add up their oxidation numbers to the net charge. This is just a simple algebraic equation. Let x be the oxidation number of Cr. Since the compound is neutral, the net charge is 0. Thus,
oxidation number for Li: +1
Oxidation number of O: -2
0 = 2(+1) + x + 4(-2)
Solving for x,
x = +6
<em>Thus, the oxidation number of Cr is +6.</em>
Answer:
B) The term "inert" was dropped because it no longer described all the group 8A elements.
Explanation:
Inert elements in chemistry simply refers to elements that are chemically inactive and are not expected to form any compounds. this is the general belief for the group 8 elements as they all have complete duplet/octet configurations (and ideally, they ought to be very stable with no tendency to form compounds by participating in the loss and gain of electrons). However the discovery of compounds like xenon tetrafluoride (XeF4) proved this to be wrong.
Again, the reason the term - inert gses was droppedis beacause this term is not strictly accurate because several of them do take part in chemical reactions.
After dropping the term - Inert gases, they are now referred to as noble gases.
The answer is threatening behavior by predators. Reason is that it is used as a self defense strategy.
Answer:
Mass = 17.8 g
Explanation:
Given data:
Number of atoms of Ca = 2.68 × 10²³
Mass in gram = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
2.68 × 10²³ atoms × 1 mole /6.022 × 10²³ atoms
0.445 mol
Mass in gram;
Mass = number of moles × molar mass
Mass = 0.445 mol × 40 g/mol
Mass = 17.8 g