Answer:
Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.
Explanation:
Answer:
1552.83J Released
Explanation:
1. mass/m=225
Initial temp:86C, final:32.5C
Changed Temp: 32.5-86= -53.5C
s=0.129 J/gC
Formula: q= m times s times changed Temp.
q=(225)(0.129)(-53.5)
q= -1552.83 J
q=1552.83 J Released
C. because a color change can occur due to chemicals mixing, but it can also be a physical change because you can see it happen with your eyes.
We require the information related to atomic mass of the compound and the number of each element present in the compound.
Option A
<u>Explanation:</u>
Molar mass is the amount of any compound present in a given sample. So we can determine the molar mass of any compound by the ratio of atomic mass of the compound to the amount of compound or element present in the sample.
So it can be defined as the mass of the compound in a given sample with respect to the number of elements present in that sample. Thus, we require the information related to atomic mass of the compound and the number of each element present in the compound.
Taking into account the definition of dilution, the new concentration of the solution is 0.2567 M.
First of all, you have to know that dilution is the reduction in concentration of a chemical in a solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volumeof the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
-
Ci: initial concentration
- Vi: initial volume
- Cf: final concentration
- Vf: final volume
In this case, you know:
- Ci= 0.385 M
- Vi= 600 mL= 0.600 L (being 1000 mL= 1 L)
- Cf= ?
- Vf= 900 mL= 0.900 L
Replacing in the definition of dilution:
0.385 M× 0.600 L= Cf× 0.900 L
Solving:
Cf= (0.385 M× 0.600 L)÷ 0.900 L
Cf= 0.2567 M
In summary, the new concentration of the solution is 0.2567 M.
Learn more about dilution: