CHEMISTRY MIDDLE SCHOOL

What kind of change occurs when I’ve becomes liquid water

Answers

Answer 1
Answer:

Answer:

Its a physical

theres no chemical properties involved.

Explanation:

Brainliest please

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The diagram below illustrates a chemical equation. Chemical equations can be used to model chemical changes and show how elements become rearranged during chemical reactions. Which statement about is chemical equation is true? A. Two compounds have reacted to produce one compound. B. Two elements have reacted to produce one element. C. One compound and one element have reacted to produce one compound. D. Two elements have reacted to produce one compound.

Answers

The correct answer is D two elements have reacted to produce one compound .

The process of photosynthesis is essential in the oxygen/carbon dioxide cycle. Photosynthesis removes ______ from the atmosphere and produces and releases ______ into the atmosphere.A) glucose, oxygen
B) oxygen, glucose
C) carbon dioxide, oxygen
D) oxygen, carbon dioxide

Answers

Photosynthesis removes carbon dioxide from the atmosphere and releases oxygen into the atmosphere. The answer is C. 
C) Carbon dioxide is removed and Oxygen is produced and released.

How does soil form from bare rock

Answers

Weathering and erosion produce smaller rock particles which, when mixed with dust result in different types of soil.

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Weathering and erosion produce ever smaller rock particles.

N2(g) + 3 H2(g) ---> 2 HN3(g) (blanced)If 5.42 g of nitrogen are reacted with 5.42 g of hydrogen gas, which of the reactants is the limiting reactant?

Molar Mass of N2 = 28.02 g/mol
Molar Mass of H2 = 2.02 g/mol
Molar Mass of NH3 = 17.04 g/mol

Answers

Answer:

N₂

Explanation:

The limiting reactant is the one that gives the smaller amount of product.

Assemble all the data in one place, with molar masses above the formulas and masses below them.

M_r:   28.02  2.02     17.04  

             N₂ + 3H₂ ⟶ 2NH₃

m/g:    5.42  5.42

1. Calculate the moles of each reactant  

\text{Moles of N}_(2) = \text{5.42 g} * \frac{\text{1 mol}}{\text{28.02 g}} = \text{0.1934 mol N}_(2)\n\n\text{Moles of H}_(2) = \text{5.42 g} * \frac{\text{1 mol}}{\text{2.02 g}} = \text{2.683 mol H}_(2)

2. Identify the limiting reactant  

Calculate the moles of NH₃ we can obtain from each reactant.

From N₂:  

The molar ratio of NH₃:N₂ is 2:1.

\text{Moles of NH}_(3) = \text{0.1934 mol N}_(2) * \frac{\text{2 mol NH}_(3)}{\text{1 mol N}_(2)} = \text{0.3867 mol NH}_(3)

From H₂:

The molar ratio of NH₃:H₂ is 3:2.  

\text{Moles of NH}_(3) = \text{2.683 mol H}_(2) * \frac{\text{2 mol NH}_(3)}{\text{3 mol N}_(2)} = \text{1.789 mol NH}_(3)

N₂ is the limiting reactant, because it gives the smaller amount of NH₃.

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Answers

Answer:

The amount of energy lessens

Explanation:

The producer will always have the most energy as it comes directly from the sun and the energy is passed onto each organism as they eat one another. The higher you are the least amount of energy you have! Hope that helps!

Which of the following is not an option for solving the world water crisis? a. desalination b. finding new sources of freshwater c. reducing overconsumption d. wastewater treatment plants Please select the best answer from the choices provided A B C D

Answers

Answer:

Option(b)

Finding new sources of fresh water is not the correct method For solving the world water crisis the solution

Explanation:

Very small amount of water available on earth is freshwater and can be used by humans for drinking and other basicnecessities. Finding a new source for fresh water is a difficult also there is an no source  found yet according to physical geography of the earth

Water consumption is need of the hour as the population of 7 billion can not survive without it and reducing over consumption can help savehugeamounts of water.

Answer:

The correct answer is option b. finding new sources of water

Explanation:

The other options are more proactive ways of alleviating the crisis, while finding new sources of freshwater is hardly an option. That would likely involve melting the glaciers to extract the Earth's largest fresh water reserves, which would subsequently destroy polar ecosystems and alter the thermohaline circulation of water across the globe, which relies heavily on the Earth's polar regions and has a large effect on the planet's climate.
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