The concentration of a solution can be expressed in(1) kelvins
(2) milliliters
(3) joules per kilogram
(4) moles per liter
Answers
The concentration of a solution can be expressed in (4) moles per liter
Further explanation
Stoichiometry in Chemistry learn about chemicals mainly emphasizes quantitative, such as the calculation of volume, mass, number, which is related to numbers, molecules, elements, etc.
In the reaction there are also manifestations of reagent substances namely gas (g), liquid (liquid / l), solid (solid / s) and solution (aqueous / aq).
The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight / volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.
- Kelvin
Temperature is used as a guide to the level of heat energy from objects
Temperature cannot be measured by the surface of the hand because it is not accurate but can be measured by a thermometer. Temperature units include Celsius, Fahrenheit, Reamur or Kelvin
- milliliters
Volume is a derivative quantity derived from the length
The unit of volume can be expressed in liters or milliliters or cubic meters
- joules per kilogram
Energy can be interpreted as the ability to do work
Energy units can be stated in joules or calories (J or Cal)
- moles per liter
Mole
The mole itself is the number of particles contained in a substance amounting to 6.02.10²³
Mole is the result of dividing the amount of substance mass and its molar mass
Molarity is a way to express the concentration of the solution
Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
Where
M = Molarity
n = Number of moles of solute
V = Volume of solution
So to find the number of moles can be expressed as
n = V x M
Learn more
the concentrations for the two ions
The molarity of the stock solution of luminol
volume of 0.100 M Na₃PO₄
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Answers
The moles of potassium nitrate present in the 50 ml of 0.2M solution has been 4 moles.
Molarity can be defined as the moles of solute in a litre of solution. The solution of potassium nitrate has been prepared to be of Molarity 0.2 M. The moles of solute present in the solution can be calculated as:
Molarity = moles volume (L)
The given volume = 50 ml
1000 ml = 1 L
50 ml = 0.05 L
Molarity of the solution = 0.2 M
The moles of solute:
0.2 = moles 0.05
Moles of Potassium nitrate = 4
The moles of potassium nitrate present in the 50 ml of 0.2M solution has been 4 moles.
For more information about the moles of solute, refer to the link:
n = M x V
n = 0.20 x 0.05
n = 0.01 moles of solute
Answers
Let x be the number of moles
Since the equation is moles/liters=molarity, change 500 mL to liters:
500.0 mL=0.5L
Divide:
x/0.5L = 0.35M
Cross multiply: x=0.35*0.5
x=0.175 moles
2.specific Heat
3.thermal equilibrium
4.Heat of Fusion
Answers
Answer: Option (3) is the correct answer.
Explanation:
When two substances or objects at the same temperature do not exchange heat with each other then this state is known as thermal equilibrium.
Whereas latent heat is the release or absorption of energy at a constant temperature.
Specific heat is the amount of heat per unit mass necessary to increase the temperature by one degree Celsius.
Heat of fusion is the amount of energy required to change the state of matter or substance.
Thus, we can conclude that out of the given options, thermal equilibrium describes the point when two objects reach the same temperature and there is no longer a transfer of energy through heat.
Answers
The alkali metal atom forms a +2 ion, while the alkaline earth metal atom forms a +1 ion.
The alkali metal atom has one less shell of electrons than the atom of the alkaline earth metal.
The alkali metal atom has one more shell of electrons than the atom of the alkaline earth metal.
Answers
Answer: The alkali metal atom forms a +1 ion, while the alkaline earth metal atom forms a +2 ion.
Explanation: Group 1 elements are called as alkali metals and group 2 elements are called as alkaline earth metals.
For example, Li is an alkali metal and Be is an alkaline earth metal.
Lithium(Li) has an atomic number of 3 and the electronic configuration is:
Li:
Thus lithium has to lose 1 electron and acquire 1+ charge to attain nearest noble gas configuration.
Berrylium(Be) has an atomic number of 4 and the electronic configuration is:
Be:
Thus berrylium has to lose 2 electrons and acquire 2+ charge to attain nearest noble gas configuration.
Answer:
a
Explanation: