Who cares. Joe can solve his own problem instead of making people do it. (This was not toward you. This was supposed to be funny)
I use small cardboard<span> boxes for organizing drawers, etc,---also break them down and use it in the garden to kill weeds, and I add some to my compost. ... side to one edge that's somewhat shorter </span>than<span> the magazine, to enable one to remove one magazine without removing the </span>whole<span> box from the shelf.</span>
A because product needs to equal reactants
Answer: Steel wool turns from a gray color to a reddish color after it gets wet and then sits on a counter is a sign of chemical change.
Explanation:
A change that brings change in chemical composition of a substance is called a chemical change.
For example, Steel wool turns from a gray color to a reddish color after it gets wet and then sits on a counter is a chemical change.
This is because steel wool is mostly made up of iron and when iron becomes wet then in the presence of air it gets oxidized and therefore, it gets corroded.
This corrosion appears as reddish color of steel wool and it represents a chemical change has occurred in the steel wool.
Thus, we can conclude that steel wool turns from a gray color to a reddish color after it gets wet and then sits on a counter is a sign of chemical change.
Answer:
Explanation:
<u>1) Reaction (given):</u>
<u />
- FeO(s) + CO(g) → CO₂(g) + Fe(s) ΔH = -11.0 kJ;
ΔS = -17.4 J/K
<u />
<u>2) Spontaneous reactions (ΔG < 0)</u>
The sign of the change in free energy (ΔG) tells if a reaction is spontaneous or not at a given temperature and constant pressure.
If ΔG is negative ( ΔG < 0) the reaction is spontaneous; if ΔG is positive ( ΔG > 0) the reaction is nonspontaneous.
Then, determine the temperature at which ΔG becomes zero, which is the temperature at which the reaction becomes nonspontaneous.
<u>3) ΔG⁰ = ΔH⁰ - TΔS⁰</u>
ΔG⁰ = -11,000 J - T (-17.4 J/ K) [ -11.0 kJ were converted to J]
0 = - 11,000 J + 17.4 T J/K
11,000 J = 17.4 T J/ k
T = 11,000 kJ / (17.4 J/K) = 632 K ← answer
