Answer:
chemical change
Explanation:
A physical change is one that makes changes to the physical properties of matter. In many cases, the difference is usually reversible. Examples include boiling, melting, freezing, the magnetization of metals, etc.
A chemical change is one in which a new kind of matter is formed. It is usually accompanied by energy changes, i.e., the evolution or absorption of energy in the form of heat or light. This process is not easily reversible. Examples include; combustion, rusting of iron, precipitation, the souring of milk, etc.
From the question given, the combination of two clear liquid in a beaker which results to formation of bubbles and changes in coloration of the solution is a chemical change.
Answer:
Sodium ions - Na⁺ - cation
Potassium ions - K⁺ cation
Chloride ions - Cl⁻ anion
Magnesium ions - Mg²⁺ cation
Calcium ions - Ca²⁺ cation
Phosphate ions - P³⁻ anion
Iron ions - Fe²⁺ cation
Zinc ions - Zn⁺ cation
Explanation:
Following is a list of 8 common but essential ions in the cells and fluids of human bodies:
1. Sodium ions helps in regulation and control the level of body fluids
2. Potassium ions help regulate cellular functions
3. Calcium ions are essential for building and maintaining strength bones and teeth. and have role in blood clotting, muscle contraction, and the transmission of nerve signals to cells.
4. Chloride ions are the main anions found outside body cells. They acts as counterions
5. Magnesium ions present in the bones
6. Phosphate ions present in body fluids act as the counterions.
7. Iron
8. Zinc
First we need to calculate the molar mass of
![Na_{2} CrO_{4}](https://tex.z-dn.net/?f=%20Na_%7B2%7D%20%20CrO_%7B4%7D%20)
:
Na: 22.99g * 2 = 45.98g
Cr: 51.996g
O: 15.999g * 4 = 63.996g
Then add all of them together:
![45.98g+51.996g+63.996g=161.97g](https://tex.z-dn.net/?f=45.98g%2B51.996g%2B63.996g%3D161.97g)
Now we know the molar mass of
![Na_{2} CrO_{4}](https://tex.z-dn.net/?f=%20Na_%7B2%7D%20CrO_%7B4%7D%20)
is 161.97g.
We are given the amount of grams used in the solution. So let's find how many moles that were used:
![\frac{1mole}{161.97g}* \frac{12.6g}{1}=0.078mol](https://tex.z-dn.net/?f=%20%5Cfrac%7B1mole%7D%7B161.97g%7D%2A%20%5Cfrac%7B12.6g%7D%7B1%7D%3D0.078mol%20%20)
We are asked to calculate the molarity, and we know the molarity formula is as follows:
![Molarity= \frac{#moles}{Liters}](https://tex.z-dn.net/?f=Molarity%3D%20%5Cfrac%7B%23moles%7D%7BLiters%7D%20)
We just calculated the number of moles that were used, and we are given the amount of solution (in mL, but we can convert 630 mL to 0.63 L by dividing by 1000 since there are 1000 mL in 1 L). So let's plug in the values to calculate for molarity:
![Molarity= \frac{0.078mol}{0.63L}=0.12M](https://tex.z-dn.net/?f=Molarity%3D%20%5Cfrac%7B0.078mol%7D%7B0.63L%7D%3D0.12M%20)
So now we know that
the molarity of the solution is 0.12 M.
Answer:
D.When the boiling points of the components are different
Explanation:
I believe the formal name for this procedure is actually distillation.