When did jellyfish, bacteria and sponges thrive?

Changing the number of protons in an atom would change which of the following ? Choose all that apply A. Atomic mass B. The iden

swat32

Answer:

A and B

Explanation:

7 0

3 years ago

Erioglucine is a blue-colored dye that absorbs its complementary color, red, in aqueous solution around 645 nm. Unfortunately, t

ExtremeBDS [4]

Answer:

For the control experiment: $0.0552 M$ of aqueous solution of erioglaucine has absorbance of $0.035 M\\$

From Lambert-Beer's law we know:

$Absorbance = e\cdot c \cdot l\\$

Here; e is the molar absorptivity coefficient of erioglaucine

l = length of cuvette in which the solution is taken = $1 cm$

A sorbance by the erioglaucine = total absorbance - absorbance by distilled $water = 0.331-0.019 = 0.312$

So; by putting the values in the above equation; we get:

$0.312 = 0.0552 M \cdot e\cdot~1cm\\$

So; $e = \frac{0.331}{0.0552} M^{-1}cm^{-1}= 5.65 M^{-1}cm^{-1}$

The molar absorptivity coefficient of erioglaucine is $5.65 M^{-1}cm^{-1}\\$

The absorbance of erioglaucine in distilled water (contaminated with metal ions) is: $0 .217$

The absorbance of distilled water is $0.019$

So; absorbance of erioglaucine itself is : $0.217-0.019 = 0.198$

Again using Lambert Beer law; we get:

$A= e\cdot c\cdot l$

$0.198 = 5.65 M^{-1}cm^{-1} \cdot c \cdot 1 cm$ $( c = concentrartion)$

c = 0.198/5.65 M = 0.035 M

The concentration of the erioglaucine is $0.035 M\\$

Explanation:

4 0

4 years ago

Help? this is a major test. i don’t understand.

m_a_m_a [10]

Mauna kea is the answr

8 0

3 years ago

Read 2 more answers

What is the difference between a renewable and nonrenewable resource

ioda

Answer:

Answer in explanation

Explanation:

A renewable source of energy is an energy source that cannot be depleted. It is an energy source with constant abundance and hence it is always in abundance. What we are saying is that they are energy sources that cannot be used up. Although it might sometimes be that it is unavailable at some instances, this does not take away the fact that it is abundant and cannot be depleted, although the strength at different times may vary. Example of renewable energy sources include solar energy, wind energy, hydroelectric power source etc. These sources are never depleted and are in abundance.

Non renewable source of energy are those sources of energy that can be depleted. A good example of this can be seen in fossil fuels. Fossil fuels are usually burned to produce energy. They are used up in the process and it will require an additional amount of fossil fuel to be restocked for the energy to be continually supplied.

6 0

4 years ago

The distance from the Moon to Earth is 5.46 * 108 km. How long does it take a laser need to travel between the moon and earth?

Gennadij [26K]

Answer:

B. 1.82(10³) seconds (1820 seconds)

Explanation:

Speed of Light: 3.00(10⁸) m/s or 3.00(10⁵) km/s

We know the distance from the Moon to Earth as 5.46(10⁸) km

We simply divide the distance by the speed of light:

$\frac{5.46(10^8)}{3.00(10^5)}$

We should get 1820 seconds or B. 1.82(10³) as our answer.

8 0

4 years ago