Answer:Valence Shell
Explanation: The Valence Shell is the outermost orbital of an atom. The Valence Shell electrons are used in making chemical bonds and are the reason the atom has its physical and chemical properties.
Answer: generic material and protein coat. Have a great day
Explanation:
The percent composition of a compound is calculated with the molecular formula: divide the mass of each element found in one mole of the compound by the total molar mass of the compound
Answer: 1. b
2. c
3. a
Explanation: A chemical reaction in equilibrium is actually in a dynamic euqilibrium, which means that changing a condition will make the equilibrium move to counteract the action and reestate the equilibrium.
For example, in the reaction:
N2(g) + 3H2(g) ⇄ 2NH3(g)
1. <u>Adding H2</u>: if you add the reagent, to reestate the equilibrium, the reaction will produce more products so, it will <u>move to the right</u>;
2. A <u>catalyst</u> doesn't interfere in the equilibrium, because it moves to the right and to the left at the same extent. Therefore, there is <u>no effect</u>.
3. <u>Decrease the pressure</u>: when you decrease the pressure of a reaction, the equilibrium will make the pressure increase again by moving towards the side of the reaction which has more molecules, so, it <u>shifts to the left</u>;
Answer: the last choice, It separates dissolved substances, which is a physical change.
Explanation:
Physical changes do not modify the composition of the substances.
The substances that undergo a physical change do not brake or form chemical bonds, they just modify ther appearance: the size, the physical state (solid, liquid, or solid), the density, the shape, that kind of properties.
The salts dissolved and the water will have the same chemical properties in solution and after being separated, so they have not had a chemical change, they have only changed their appearance, so this explains why it is a physical change.