All categories

3 years ago

What do the presence of fish and a wide diversity of invertebrates in a river indicate?

Chemistry

1 answer:

Yakvenalex [24]3 years ago

6 0

High biodiversity in the environment.

You might be interested in

if a 500.0-g block of metal absorbs 5,016J of heat when its temperature changes from 20.00 Celcius, what is the specific heat?

ZanzabumX [31]

Correction: The temperature change is from 20 °C to 30 °C.

Answer:
Cp = 1.0032 J.g⁻¹.°C⁻¹

Solution:

The equation used for this problem is as follow,

Q = m Cp ΔT ----- (1)

Where;
Q = Heat = 5016 J

m = mass = 500 g

Cp = Specific Heat Capacity = ??

ΔT = Change in Temperature = 30 °C - 20 °C = 10 °C

Solving eq. 1 for Cp,

Cp = Q / m ΔT

Putting values,
Cp = 5016 J / (500 g × 10 °C)

Cp = 1.0032 J.g⁻¹.°C⁻¹

4 0

3 years ago

Use the Henderson-Hasselbalch equation, eq. (3), to calculate the pH expected for a buffer solution prepared from this acid and

notka56 [123]

Answer:

$pH=4.56$

Explanation:

Hello there!

In this case, given the Henderson-Hasselbach equation, it is possible for us to compute the pH by firstly computing the concentration of the acid and the conjugate base; for this purpose we assume that the volume of the total solution is 0.025 L and the molar mass of the sodium base is 234 - 1 + 23 = 256 g/mol as one H is replaced by the Na:

$n_{acid}=\frac{0.2g}{234g/mol}=0.000855mol\\\\n_{base}= \frac{0.2g}{256g/mol}=0.000781mol$

And the concentrations are:

$[acid]=0.000855mol/0.025L=0.0342M$

$[base]=0.000781mol/0.025L=0.0312M$

Then, considering that the Ka of this acid is 2.5x10⁻⁵, we obtain for the pH:

$pH=-log(2.5x10^{-5})+log(\frac{0.0312M}{0.0342M} )\\\\pH=4.60-0.04\\\\pH=4.56$

Best regards!

6 0

2 years ago

Can someone please help me

lilavasa [31]

Answer:

Z was smaller than X

Explanation:

if X<Y and Y<Z

therefore X<Z

8 0

2 years ago

In a water molecule, what type of bond forms between the oxygen and hydrogen atoms

goldenfox [79]

Covalent bond forms between the oxygen and hydrogen atoms.

(I attached a picture that could help)

-Hope that helps,
Good luck!

7 0

2 years ago

10. The statement that no two electrons in the same atom can have the

Fynjy0 [20]

Answer:

10.the pauli exclusive principle statues that, in an atom

or molecules, no two electrons can have same four electronic quantum numbers.as an orbit can contain a maximum of only two electrons.the two electrons must have opposing spins

3 0

2 years ago