Answer:
2.34 mins
Explanation:
The regression equation in mathematical terms, shows the relationships between a dependent variable (reaction time) and one or more independent variables (exposure to a chemical level).
It also shows the effect of exposure to chemical on the reaction time.
The linear regression equation Y=2.3X-1.8 can be used to make predictions about about Y which is the reaction time for a given value of X which is the level of exposure to chemical.
From the question, X (level of exposure to chemical) is 1.8
The regression equation becomes
Y=2.3(1.8) - 1.8
Y= 4.4 - 1.8
Y= 2.34
There fore, the reaction time is 2.34 mins
Answer:
c)
Explanation:
The reaction between ethene and HBr is:
CH2=CH2 + HBr → CH3CH2Br
Thus, the double bond C=C and the bond H-Br were broken, and the bonds C-C, C-H and C-Br were formed. The enthalpy of the reaction (the energy change), is the sum of the enthalpies of the reactions that were broken with the bonds that were created.
To break a bond, it's necessary to the molecule to gain energy, thus the process is endothermic and H>0, and to form a bond, it's necessary to release energy, and so H<0, so:
ΔH = ∑n*Hbroken - ∑n*Hformed, where n is the coefficient of the substance, so:
ΔH = (612 + 366) - (348+412+276)
ΔH = -58 kJ/mol
The minus signal indicates that the energy was released.
Answer:
10.875 miles
So 87 minutes
.125 miles per minute
So just multiply int his case
87*.125
You’d get 10.875
Answer:
A pure substance is a substance composed of one substance. It has fixed physical and chemical properties. It has special chemical symbols, which can be expressed by a chemical formula. Water is pure, so what you mean by liquid ice is pure.
Explanation:
Answer:
2000 mL
Explanation:
Given data:
Number of moles KMnO₄ = 6 mol
Molarity of solution = 3M
Volume of solution in mL = ?
Solution:
Formula:
Molarity = number of moles of solute / volume of solution in L
3 M = 6 mol / volume of solution in L
volume of solution in L = 6 mol/ 3 M
volume of solution in L = 2 L
Now we convert the L into mL:
1 L = 1000 mL
2 L × 1000 mL / 1 L
2000 mL