CHEMISTRY MIDDLE SCHOOL

For each cycle,explain how humans actions have altered or disrupted the cyclewater cycle:

carbon cycle:

nitrogen cycle:

Answers

Answer 1
Answer: Water Cycle- we interrupt the flow of water by withdrawal (taking the water out of its natural system to carry out industrial processes, irrigation and to provide drinking water. Discharging also affects the flow of water, whether intentionally or not. By adding chemicals to the water, it pollutes the water and can cause damage not only to organisms but to the environment.

Carbon Cycle - humans greatly affect carbon cycle by immense deforestation activity, which increase the carbon dioxide content in the atmosphere and also the burning of coals, which also increase the carbon content in the surrounding which will result to global warming.

Nitrogen Cycle - one of the major influences of humans in the nitrogen cycle is evident in agriculture. Farmers attempt to increase the availability of nitrogen to the land which is essential to the plants that is why they add nitrogen-containing fertilizers.This results to the larger rate of nitrogen input than occurs naturally through nitrogen fixation processes.

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Why do the particles of objects have both kinetic and potential energy?  

Answers

The particles of objects have both kinetic and potential energy because these forces are drive by the force of motion or stillness of an object. Potential energy is the a type of energy which an object possess however without motion. Kinetic energy in the other hand, is the energy in motion or if the object moves along from one space to another with respect to time. They both have these two energies by the presence of atoms in these entities.



Compared to the physical and chemical properties of the compound NO2 the compound N2O has(1) different physical properties and different chemical properties

(2) different physical properties and the same chemical properties

(3) the same physical properties and different chemical properties

(4) the same physical properties and the same chemical properties

Answers

Answer: option (1) different physical properties and different chemical properties.


Justification:


1) Any chemical compound has its unique physical and chemical properties.


2) Although formed by the same elements, N and O, NO₂ and N₂O are different compounds, so each will have its proper physical and chemical properties.


3) The union of the atoms by chemical bonds confere the properties to a matter, so being the bonds in N₂O different to the bonds in N₂O means they are different compounds.

If u pour flour and sugar in one bowl is the substance a mixture atom or element

Answers

im pretty sure it's element

Which type of organic molecule is an amino acid? A. building block of carbohydrates B. building block of proteins C. building block of nucleic acids D. building block of lipids

Answers

B. building block of proteins
Amino acids are the monomer (building blocks) of proteins. On repeating, they constitute a protein which is polymer of amino acid.

In short, Your Answer would be Option B

Hope this helps!

How can you use knowledge of a minerals chemical makeup or use? A: To determine how to break down minerals

B: To determine the color of the minerals

C: To classify minerals

D: To identify minerals

Answers

and D. to identify minerals

Answer: D: Identify minerals

Explanation: If you can figure out the chemical makeup or the use of a mineral, you can identify what kind of mineral it is.

47.0 ml of an HBr solution were rotated with 37.5 ml of a 0.215 m lioh solution to reach the equivalent point. What is the molarity of the hbr solution

Answers

Answer:

0.172 mol·L⁻¹

Step-by-step explanation:

1. Write the chemical equation for the reaction.

HBr + LiOH ⟶ LiBr + H₂O

===============

2. Calculate the moles of LiOH

c = n/V         Multiply each side by V

n = Vc

V = 0.0375 L

c = 0.215 mol·L⁻¹

Moles of LiOH = 0.0375× 0.215

Moles of LiOH = 8.062 × 10⁻³ mol LiOH

===============

3. Calculate the moles of HBr

1 mol HBr ≡ 1 mol LiOH

Moles of HBr = 8.062 × 10⁻³× 1/1

Moles of HBr = 8.062 × 10⁻³ mol HBr

===============

4. Calculate the molar concentration of the HBr

V = 47.0 mL = 0.0470 L

c = 8.062 × 10⁻³/0.0470

c = 0.172 mol·L⁻¹

The molarity of the HBr solution is 0,172 M.

The neutralization reaction between LiOH and HBr is the following:

HBr(aq) + LiOH(aq) → LiBr(aq) + H₂O(l)
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