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guapka [62]
2 years ago
6

Emily is a competitive swimmer. Why does wearing a swim cap help Emily swim faster?

Chemistry
1 answer:
faust18 [17]2 years ago
8 0
Well the problem is that Emily is capping. PERIODT jpjp
the answer is
B) the cap keeps the hair out of her eyes

I SWEAR IF IM WRONG THAN EMILY CAPPING CUZ MY CAP DECTOR IS GOING OFF
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The movement of tectonic plates is so slow and gradual that you cannot see or feel them moving. As a result, scientist depend on
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centimeters per year

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()
const2013 [10]

Answer:

\large \boxed{\text{-1276 kJ/mol}}

Explanation:

You calculate the energy required to break all the bonds in the reactants.

Then you subtract the energy needed to break all the bonds in the products.

                             CH₃CH₂OH        +  3O₂ ⟶ 2CO₂ + 3H₂O

Bonds:         5C-H 1C-C 1C-O 1O-H    3O=O     4C=O   6O-H

D/kJ·mol⁻¹:    413    347  358  467       495        799      467

\Delta H = \sum{D_{\text{reactants}}} - \sum{D_{\text{products}}}\\\sum{D_{\text{reactants}}} = 5 \times 413 + 1 \times 347 + 1 \times 358 + 1 \times 467 + 3 \times 495 = 3237 + 1485\\=\text{4722 kJ}\\\sum{D_{\text{products}}} = 4 \times 799 + 6 \times 467 =3196 + 2802 = \text{5998 kJ}\\\Delta H = 4722 - 5998= \textbf{-1276 kJ} \\ \text{The overall energy change is $\large \boxed{\textbf{-1276 kJ/mol}}$}.

6 0
3 years ago
A quantity of 85.0 mL of 0.900 M HCl is mixed with 85.0 mL of 0.900 M KOH in a constant-pressure calorimeter that has a heat cap
san4es73 [151]

Answer:

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0.085 l * 0.900 mol/ L = 0.0765 mol HCL

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Change in temperature:    The mass to use in the equation Q=cmT.  

4229 J / (4.186 J/gC*170 g) = 6.042 C

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18.24 + 6.042 = 24.29 C°

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In 1969, Neil Armstrong became the first person to walk on the Moon. Video coverage
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Hi there! The answer is D. The astronaunt's weight on the Moon depends on the Moon's gravitational force.

(Hope this helps) Sky

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