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3 years ago

After severe dust storms in the 1930s, practices were put in place to reduce soil erosion. Which

Chemistry

1 answer:

Bingel [31]3 years ago

3 0

Answer:

the answer is B) Planting native grasses in bare soil

Explanation:

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Is the chemical equation balanced? Zn + 2HCl → ZnCl2 + H2 no, or yes

tamaranim1 [39]

Answer:

Yes.

General Formulas and Concepts:

Chemistry - Stoichiometry

Balancing reactions
Reaction prediction

Explanation:

Step 1: RxN

Zn + HCl → ZnCl₂ + H₂

Step 2: Balance RxN

Zn + 2HCl → ZnCl₂ + H₂

Need 2 H's on both sides
Need equal amount of Cl's on both sides

3 0

3 years ago

The concentration of a biomolecule insdie a rod-shaped prokaryotic cell is 0.0051 M. Calculate the number of molecule inside the

Ann [662]

Answer: The number of molecules inside the cell are $2.2\times 10^6$

Explanation:

We are given a prokaryotic cell, which is in the shape of rod or cylinder.

The equation used to calculate the volume of cylinder is:

$V=\pi r^2h$

where,

V = volume of cell = ?

r = radius of the celle = $\frac{d}{2}=\frac{1.7\mu m}{2}=0.85\mu m=8.5\times 10^{-7}m$ (Conversion factor: $1m=10^6\mu m$ )

h = length of the cell = $3.1\mu m=3.1\times 10^{-6}m$

Putting values in above equation, we get:

$V=(3.14)\times (8.5\times 10^{-7})^2\times 3.1\times 10^{-6}\\\\V=7.033\times 10^{-18}m^3$

To calculate the number of moles for given molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

Molarity of biomolecule = 0.0051 M

Volume of solution = $7.033\times 10^{-18}m^3=7.033\times 10^{-15}L$ (Conversion factor: $1m^3=1000L$ )

Putting values in above equation, we get:

$0.0051M=\frac{\text{Moles of biomoleculel}}{7.033\times 10^{-15}L}\\\\\text{Moles of biomolecule}=(0.0051mol/L\times 7.033\times 10^{-15}L)=3.59\times 10^{-17}mol$

According to mole concept:

1 mole of a compound contains $6.022\times 10^{23}$ number of molecules

So, $3.59\times 10^{-17}$ moles of a biomolecule will contain = $(3.59\times 10^{-17}\times 6.022\times 10^{23}=2.2\times 10^6$ number of molecules

Hence, the number of molecules inside the cell are $2.2\times 10^6$

5 0

3 years ago

About how many minerals make up most types of rock?

Margaret [11]

Answer:

20 different kinds of minerals make up 95% of earth's rocks.

 I hope this helps... please correct me if i'm wrong

3 0

3 years ago

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Why are deposits of pure sodium metal or pure potassium metal not seen in nature

Natasha2012 [34]

They are not seen in nature because they are always combined with something to make something else.

5 0

3 years ago

1.which electromagnetic wave has the; longest wavelength, lowest speed, highest frequency, and greatest energy ?

Sergeu [11.5K]

Radio waves infrared rays, visible light, ultraviolet rays, X-rays, and gamma rays are all types of electromagnetic radiation. Radio waves have the longest wavelength, and gamma rays have the shortest wavelength.

8 0

3 years ago