Answer: B. warming ice to produce water
Explanation:
A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions. Example: Melting of ice
A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.
Example: Corrosion of iron called as rusting.
Endothermic reactions are those in which heat is absorbed by the system and exothermic reactions are those in which heat is released by the system.
A. heating a rock to make it hot : It requires addition of energy and does not involve any change.
B. warming ice to produce water : It requires addition of energy and is a physical change
C. igniting a hydrogen-filled balloon: It needs energy and is a chemical change
D. burning paper to produce 
and carbon : It releases energy and is a chemical change
. There actually are simple... F have higher electronegativity (4.0) than Cl. Electronegativity refers to the ability of an atom to attract shared electrons in a covalent bond.
Answer: 180g
Explanation:
No of moles= volume ×molarity/1000
Volume is given as 750ml
Molarity is given as 6M
Substitute to get the mole
No of moles = 750×6/1000
No of moles= 4.5moles
Remember that
No of moles also = mass given/molar mass
Molar mass of NaOH
Na= 23
O=16
H=1
Molar mass = na +o+h
Molar mass =23+16+1
Molar mass=40g/mol
Substitute
No of moles = mass given/molar mass
Mass = 4.5×40
Mass = 180g
The mass of NaOH needed is 180g
This uses something called <span>Le Chatelier's principle. It states essentially that any stress put upon a system will be corrected.
In more simple terms, it means that in an equilibrium, such as the equation N2(g) + 3H2(g) <=> 2NH3(g), removing a reactant will cause the system to create more of said reactant to compensate for its loss, or adding excess reactant will cause the system to remove some of the added reactant. For future reference, the same principle applies to products in an equilibrium as well.
In this case, hydrogen gas is a reactant, and hydrogen is being removed. According to </span><span>Le Chatelier's principle, the system will shift to create more hydrogen gas. In essence, it will shift in the direction of the hydrogen gas, so there will be a shift toward the reactants.
To clear something up, Keq will not change, as it is a constant value with constant conditions (such as temperature, pressure, etc.).</span>
Well they are different widths and and sizes shapes, and so they are different because of that.
