The reaction between ethanol C2H5OH and water H2O is a chemical reaction and is exothermic.
Option A is correct.
<h3>What is a chemical reaction?</h3>
A chemical reaction is a rearrangement between the ions and molecules of a substance. For a chemical reaction to take place, bonds are broken in the reactants and new bonds are formed in the products.
The chemical reaction between ethanol and water is;
- This reaction is exothermic because molecules move from a higher state of energy to lower states.
- The resulting volume is also lesser than the initial volumes of the reactants according to Henry's Law, showing that heat is given off to the walls of the container.
Therefore, we can conclude that A chemical reaction occurs, as evidenced by the volume of the resultant mixture being less than the total volume of the initial components.
Learn more about the chemical reaction here:
brainly.com/question/26018275
If your watch says 12:00 noon and you
are in New York, which is in the EST Time Zone, you need to set your watch back two
hours to 10:00 AM if you are traveling to Denver in the MST Zone.
Answer:
r = 0.7575
Explanation:
Result Details & Calculation
This is a strong positive correlation, which means that high X variable scores go with high Y variable scores (and vice versa).
X Values
∑ = 78
Mean = 15.6
∑(X - Mx)2 = SSx = 337.2
Y Values
∑ = 428
Mean = 85.6
∑(Y - My)2 = SSy = 57.2
X and Y Combined
N = 5
∑(X - Mx)(Y - My) = 105.2
R Calculation
r = ∑((X - My)(Y - Mx)) / √((SSx)(SSy))
r = 105.2 / √((337.2)(57.2)) = 0.7575
Meta Numerics (cross-check)
r = 0.7575
Let p represent the number of people that signed up for programming class.
Math class = 9p
Total students = 9p + p = 10p
We also know that 45 students are wanted in each class, therefore there are 45*2=90 total students.
Now:
10p = 90
p = 9
45 - 9 = 36 students that needed to be moved.
