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Triss [41]
3 years ago
6

A student completed a lab report. Which correctly describes the difference between the “Question” and “Hypothesis” sections of h

er report?
“Question” states what she is asking, and “Hypothesis” states the result of her experiment.
“Question” states what she is asking, and “Hypothesis” states what she thinks the answer to that question is in “if . . . then . . . because” format. “Question” describes what she is trying to find out, and "Hypothesis" states the procedures and methods of data collection.
“Question” describes what she is trying to find out, and “Hypothesis” states any additional information or prior knowledge about the question
Chemistry
2 answers:
valkas [14]3 years ago
6 0

Answer:

b

Explanation:

b

ValentinkaMS [17]3 years ago
4 0

The answer is:

“Question” states what she is asking, and “Hypothesis” states what she thinks the answer to that question is in “if . . . then . . . because” format.

I hope you find my answer helpful.

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How many moles of NaF are produced in the resction between sodium bromide and calcium fluoride when 550 grams of sodium bromide
bija089 [108]

Answer: 5 moles of NaF would be produced when 550 grams of Sodium bromide are used.

Explanation:

From the question, the balanced chemical formula is illustrated below:

2NaBr + CaF2 → 2NaF + CaBr2

From the equation above;

Molecular mass of NaBr = 23 + 80 = 103g/ mol

Molecular mass of CaF2= 40+ (19×2)= 78g/ mol

Molecular mass of NaF = 23+19 = 42g/ mol

From the balanced chemical equation;

2 moles of NaBr reacted with 1mole of CaF to give 2 moles of NaF.

That is, 2 moles of NaBr= 2× 103 = 206g

2moles of NaF = 2×42= 84g

If 206g of NaBr yielded 84g of NaF

Therefore 550g of NaBr will yield Xg of NaF

X= 550×84/206

X= 224.27g of NaF

But 42g = 1 mole of NaF

Therefore 224.27g = X mole of NaF

X= 224.27 ×1/42

X is approximately 5moles.

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