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yarga [219]
3 years ago
7

To test the quality of water sources in her area, Shameka collects five samples from each water source and tests the quality of

each sample.
Which important step of scientific design is Shameka conducting?


repetition

replication

verification of results

using controlled variables
Chemistry
1 answer:
Blizzard [7]3 years ago
4 0

Answer:

The answer is "Verification of results ".

Explanation:

The scientific system consisted inside an iterative or cyclical process which experimental results and technically confirm a theory. There are four things which scientific design aims people explain:  

  • Subject of investigation characterization.  
  • Hypothesis from its consequences of its characterization.  
  • Forecasts.  
  • Experimentation which show the precision and consistency of the hypothesis.  

Its first stage of analysis involves collecting the samples taken for the current context, that are the focus of discussion, and then testing the samples taken to determine the absorbance of soft and hard salts throughout the water. It is required for water quality to be determined. Therefore, the collection and testing of samples falls under the scientific design category of classification, whereby Shamekha tried to verify the findings.

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PLEASE HELP ME!!! ASAP
shtirl [24]

Answer:

Theoretical yield of the reaction = 34 g

Excess reactant is hydrogen

Limiting reactant is nitrogen

Explanation:

Given there is 100 g of nitrogen and 100 g of hydrogen

Number of moles of nitrogen = 100 ÷ 28 = 3·57

Number of moles of hydrogen = 100 ÷ 2 = 50

Reaction between nitrogen and hydrogen yields ammonia according to the following chemical equation

N2 + 3H2 → 2NH3

From the above chemical equation for every mole of nitrogen that reacts, 3 moles of hydrogen will be required and 2 moles of ammonia will be formed

Now we have 3·57 moles of nitrogen and therefore we require 3 × 3·57 moles of hydrogen

⇒ We require 10·71 moles of hydrogen

But we have 50 moles of hydrogen

∴ Limiting reactant is nitrogen and excess reactant is hydrogen

From the balanced chemical equation the yield will be 2 × 3·57 moles of ammonia

Molecular weight of ammonia = 17 g

∴ Theoretical yield of the reaction = 2 × 3·57 × 17 = 121·38 g

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How is it possible for there to be more than one kind of atom of the same element?
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They are called isotopes.

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And

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