Answer:
Explanation:
We have to start this question with <u>Beer's Law</u>, 
. On this equation we will have:
<u>A=Absorbance</u>
<u>E=Molar absorption coefficient</u>
<u>b= Optical path</u>
<u>C=Concentration</u>
So, the question is: <u>what values of this equation we know?</u>. If we check the question we have the <u>absorbance value "0.148"</u> additionally we have the slope of the plot, this <u>slope is the molar absorption coefficient</u>, therefore <u>E=0.598 M-1</u>, finally we have also the optical path. <u>The optical path is 1 cm</u> for all devices, so <u>b=1 cm</u>. With all these values we can calculate the concentration "C".
So, we will have a <u>concentration of 0.247 M</u>
I hope it helps!
Answer:- density of the liquid is 0.21 gram per mL.
Solution:- 
From given data, mass of cylinder = 10.4 g
mass of cylinder along with liquid = 11.7 g
So, mass of liquid = 11.7 g - 10.4 g = 1.3 g
Volume of liquid = 6.2 mL
Let's divide the mass by the volume to get the density of the liquid:
density = 
So, the density of the liquid is 0.21 gram per mL.
Answer:
![K_a=\frac{[H_3O^+][HCO_3^-]}{[H_2CO_3]}](https://tex.z-dn.net/?f=K_a%3D%5Cfrac%7B%5BH_3O%5E%2B%5D%5BHCO_3%5E-%5D%7D%7B%5BH_2CO_3%5D%7D)
Explanation:
Several rules should be followed to write any equilibrium expression properly. In the context of this problem, we're dealing with an aqueous equilibrium:
- an equilibrium constant is, first of all, a fraction;
- in the numerator of the fraction, we have a product of the concentrations of our products (right-hand side of the equation);
- in the denominator of the fraction, we have a product of the concentrations of our reactants (left-hand side o the equation);
- each concentration should be raised to the power of the coefficient in the balanced chemical equation;
- only aqueous species and gases are included in the equilibrium constant, solids and liquids are omitted.
Following the guidelines, we will omit liquid water and we will include all the other species in the constant. Each coefficient in the balanced equation is '1', so no powers required. Multiply the concentrations of the two products and divide by the concentration of carbonic acid:
Answer:
in days
Explanation:
A short term environmental change refers to changes in the environment that happens within a short period of time, for example, flooding, drought, volcanic eruptions etc. In contrast to short term environmental change, long term environmental change takes place over a long period of time hence species have a longer time to adapt to it. Short term environmental changes may or may not be caused by humans. An example of a short term environmental change caused by humans is oil spillage. Short term environmental changes may lead to the the migration of species from the ecosystem.
Short term environmental changes usually occur within a very short time. The greatest time frame in which a short term environmental change can occur is in a matter of days. Only longterm environmental changes span hundreds and thousands of years.
