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laila [671]
3 years ago
7

Which is an example of a set point for the body? A. hair color B. type of blood C. thumb crossing style D. amount of blood gluco

se
Chemistry
1 answer:
Mama L [17]3 years ago
7 0
The Answer Is B Type Of Blood
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The properties of a mineral depend on the ________ of mineral being examined.
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The properties of a mineral depend on the kind of atoms of mineral being examined

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The respiratory system should remove which of the following from your body? A. carbon monoxide B. carbon dioxide C. oxygen D. ox
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Read 2 more answers
When 125 mL of 0.150 M Pb(NO3)2 is mixed with 145 mL of 0.200 M KBr, 4.92 g of PbBr2 is collected. Calculate the percent yield.
Semenov [28]

Answer:

Y = 92.5 %

Explanation:

Hello there!

In this case, since the reaction between lead (II) nitrate and potassium bromide is:

Pb(NO_3)_2+2KBr\rightarrow PbBr_2+2KNO_3

Exhibits a 1:2 mole ratio of the former to the later, we can calculate the moles of lead (II) bromide product to figure out the limiting reactant:

0.125L*0.150\frac{molPb(NO_3)_2}{L} *\frac{1molPbBr_2}{1molPb(NO_3)_2} =0.01875molPbBr_2\\\\0.145L*0.200\frac{molKBr}{L} *\frac{1molPbBr_2}{2molKBr} =0.0145molPbBr_2

Thus, the limiting reactant is the KBr as it yields the fewest moles of PbBr2 product. Afterwards, we calculate the mass of product by using its molar mass:

0.0145molPbBr_2*\frac{367.01gPbBr_2}{1molPbBr_2} =5.32gPbBr_2

And the resulting percent yield:

Y=\frac{4.92g}{5.32g} *100\%\\\\Y=92.5\%

Regards!

4 0
3 years ago
Mr. Jones, the science teacher, tells his students that energy cannot be created; it must be captured from the environment. He i
taurus [48]

The law of conservation of energy or first law of thermodynamics

Explanation:

From the context we can infer that Mr. Jones was describing the law of conservation of energy.

According to the law of conservation of energy:

  "energy is not created nor destroyed by can be transformed from one form to another" .

  The captured energy is a form of energy and it is change into other forms in the ecosystem.

Energy is initially captured in the ecosystem by plants.

learn more:

Laws of thermodynamics brainly.com/question/3564634

#learnwithBrainly

6 0
3 years ago
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