Let us say that R is the major enantiomer, while
S is the minor enantiomer, therefore the formula for enantiomeric excess (ee)
is:
ee = (R – S) * 100%
Let us further say that the fraction of R is x (R
= x), and therefore fraction of S is 1 – x (S = 1 – x), therefore:
75 = (x – (1 – x)) * 100
75 = 100 x – 100 + 100 x
200 x = 175
x = 0.875
Summary of answers:
R = major enantiomer = 0.875 or 87.5%
<span>S = minor enantiomer = (1 – 0.875) = 0.125 or
12.5%</span>
Sublimation is when a solid turns directly into a gas, completely bypassing the liquid phase. Dry ice is a good example.
Answer: A. vegetables, meat, chicken
B. insects, fruits, seeds
Explanation:
A primary consumer is the trophic level in the food chain, which feeds upon the plants and other autotrophs. It includes all the herbivorous animals.
A secondary consumer is the trophic level in the food chain, which feeds upon the herbivorous animals. They are carnivores.
A and B are the two correct options. A will feed upon both plant and animal products such as vegetables and meat, and chicken respectively.
Also B also consumes over the plant products such as fruits and seeds and insects.
Answer:
300g of water was used to make the solution
Explanation:
In the sugar solution, there are dissolved 45g of sugar in 100mL of water. The conversion factor is <em>45g Sugar = 100mL water</em>. That means when 135g of sugar are used the amount of water is:
135g sugar * (100mL water / 45g sugar) =
<h3>300g of water was used to make the solution</h3>
Answer:
a = -2.4 ms⁻²
Explanation:
Given data:
Initial velocity of car = 37.1 m/s
Final velocity of car = 29.8 m/s
Time taken to change velocity = 3 sec
Acceleration of car = ?
Solution:
Formula:
a = Vf - V₀ / t
Vf = Final velocity
V₀ = Initial velocity
a = acceleration
t = time taken to change velocity
Now we will put the values in formula.
a = 29.8 m/s - 37.1 m/s / 3 s
a = -7.3 m/s/ 3s
a = -2.4 ms⁻²
Negative sign show that car is slowing down.
