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ratelena [41]
4 years ago
7

Eddie experimented to find out which freezes at a lower temperature, distilled water or salt water. The steps he used in his exp

eriment are shown below.
1Fill one beaker with 250 mL of room-temperature distilled water

2Fill another beaker with 250 mL of room-temperature salt water

3Measure the mass of the liquid in both beakers

4Place both beakers in a freezer

Observe the temperature at which the liquids freeze

Which of the steps in Eddie's experiment was NOT needed?
A.4
B.2
C.3
D.1
Chemistry
1 answer:
olga2289 [7]4 years ago
3 0

Answer:

the answer is C. 3. measure the mass of the liquid in both beakers

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N2(g) + 3H2(g) →2NH3(g)
monitta

Answer:

2.5 moles of N₂ and 7.5 moles of H₂ entered the reaction

Explanation:

In reaction:

N₂(g) + 3 H₂(g) → 2 NH₃(g)

You can see that the stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction) requires the following amounts of reagents and are produced:

  • N₂: 1 mole
  • H₂: 3 moles
  • NH₃: 2 moles

The following three rules can apply:

  • If 2 moles of NH₃ are produced from 1 mole of N₂ by stoichiometry of the reaction, 5 moles of NH₃ from how many moles of N₂ are produced?

moles of N_{2} =\frac{5 moles of NH_{3} *1 mole of N_{2} }{2 moles of NH_{3}}

moles of N₂= 2.5

  • If 2 moles of NH₃ are produced from 3 moles of H₂ by stoichiometry of the reaction, 5 moles of NH₃ from how many moles of H₂ are produced?

moles of H_{2} =\frac{5 moles of NH_{3} *3 mole of H_{2} }{2 moles of NH_{3}}

moles of H₂= 7.5

<u><em>2.5 moles of N₂ and 7.5 moles of H₂ entered the reaction</em></u>

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3 years ago
Is there more or less air near sea level
vampirchik [111]

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An idea that is supported by some evidence, but is not yet the basis for a field study is called
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Answer:

The correct answer is working theories.

Explanation:

The theories that combine skills, knowledge, and attitudes taken from the experiences with places, individuals, and things are known as working theories. These theories function in monitoring events, making sense of experience, and solving issues, and create in order to turn more applicable and useful, more interconnected, and elaborate. The working theories are supported by certain proofs, however, they are not the basis for a field study yet.

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B. New atoms are formed as products.
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PLEASE HELPPP ME!!!!​
tiny-mole [99]

Answer: i think its b or c

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