Its important for a persons heart to be healthy so that it wont get any diseases such as :<span>Cardiomyopathies
Coronary Artery Disease.
Diabetes
Diseases of the Heart Valves.
Heart Defects present at Birth
High Blood Pressure.
Lung Disease such as Emphysema.
<span>Past Heart Attacks</span></span>
Answer:
C.) new substances that are present at the end of a reaction.
Explanation:
In a chemical reaction, substances are combined to form other substances. The substances, in a chemical reaction, that are combined or used up are called REACTANTS while those substances that are synthesised newly at the end of the reaction are called PRODUCTS.
For example, in the chemical reaction between carbon dioxide and water in photosynthesis to form glucose and oxygen as follows:
6CO2 + 6H2O --> C6H12O6 + 602
CO2 and H2O are the REACTANTS because they are the combined substances.
C6H12O6 and 02 are the PRODUCTS because they are new substances present at the end of the reaction.
Answer:
11482 ppt of Li
Explanation:
The lithium is extracted by precipitation with B(C₆H₄)₄. That means moles of Lithium = Moles B(C₆H₄)₄. Now, 1 mole of B(C₆H₄)₄ produce the liberation of 4 moles of EDTA. The reaction of EDTA with Mg²⁺ is 1:1. Thus, mass of lithium ion is:
<em>Moles Mg²⁺:</em>
0.02964L * (0.05581mol / L) = 0.00165 moles Mg²⁺ = moles EDTA
<em>Moles B(C₆H₄)₄ = Moles Lithium:</em>
0.00165 moles EDTA * (1mol B(C₆H₄)₄ / 4mol EDTA) = 4.1355x10⁻⁴ mol B(C₆H₄)₄ = Moles Lithium
That means mass of lithium is (Molar mass Li=6.941g/mol):
4.1355x10⁻⁴ moles Lithium * (6.941g/mol) = 0.00287g. In μg:
0.00287g * (1000000μg / g) = 2870μg of Li
As ppt is μg of solute / Liter of solution, ppt of the solution is:
2870μg of Li / 0.250L =
<h3>11482 ppt of Li</h3>
Energy in a chemical reaction is not created nor destroyed, it's always conserved based on the law of conservation of energy.