Explanation:
23 are the number of atoms
Atomic number = protons
Protons = P Electrons = E P = E
Atomic mass = Neutrons + Protons
Atomic number = atomic mass = neutrons
P = E
AM - AN = N
Example:
Calcium = 20 Protons 20P = 20E
Atomic mass - atomic number = neutrons :)
your answer is Option B
there are 90 elements found naturally so option B statement is incorrect
HOPE THIS WILL HELP YOU
In a homogenous
mixture, sugar was the solute and water was the solvent. Solubility is the maximum
amount of a solute that dissolves in a given amount of solvent at a constant
temperature. Solutes
are more soluble in a given solvent at higher temperatures. Therefore, when
temperature increases, the solubility of the solute also increases.
<span>Moreover, the solubility of the substance ranges from infinitely soluble such
as alcohol in water, to poorly soluble like silver chloride in water and the
species that dissolves, the solute, can be another liquid, gas or a solid.</span>
Answer:
Explanation:
<u>1) Data:</u>
a) M = 0.5 M
<u>Note</u>: since the question is about volume (liters) and moles of solute, the correct unit for the concentration of the hydroxide solution is M (upper case) which is the unit for molarity. Lower case m is used for molality, and you cannot calculate the volume of the solution unless you know some other data, e.g. density of the solution.
b) n = 2
c) V (in liters) = ?
<u>2) Formula:</u>
Molarity is the number of moles of solute per liter of solution:
<u>3) Solution:</u>
a) Clear V from the formula: V (in liters) = M / n
b) Substitute: V (in liters) = 2 moles / 0.5M = 4 liters ← answer
