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V125BC [204]
3 years ago
6

PLEASEPLEASEPLEASE HELP ME IVE BEEN ASKING FOR ALMOST AN HOUR NOW AND NO ONES HELPING ME ILL GIVE BRAINLIEST PLS JUST HELP :((

Chemistry
2 answers:
gizmo_the_mogwai [7]3 years ago
7 0

Answer:

A

Explanation:

The mechanism of contraction is the binding of myosin to actin, forming cross-bridges that generate filament movement (Figure 19.36).

Figure 38.36.  When (a) a sarcomere (b) contracts, the Z lines move closer together and the I band gets smaller. The A band stays the same width and, at full contraction, the thin filaments overlap.

SOVA2 [1]3 years ago
3 0

Answer:

C

Explanation:

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The fossil could tell the scientist that the dessert was once a sea

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4 years ago
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Type the correct answer in the box. Express the answer to three significant figures.
frutty [35]

Answer : The energy released is -3319.7 KJ.

Solution : Given,

Mass of methane = 59.7 g

Molar mass of methane = 16 g/mole

\Delta H=-890KJ/mole

The value of \Delta H is in negative that means the energy is releasing.

First we have to calculate the moles of methane.

Moles of methane = \frac{\text{ Mass of methane}}{\text{ Molar mass of methane}}= \frac{59.7g}{16g/mole}=3.73moles

Now we have to calculate the amount of energy released.

The given reaction is,

CH_4+2O_2\rightarrow CO_2+2H_2O

From the reaction, we conclude that

1 mole of methane releases -890 KJ/mole of energy

3.73 moles of methane releases \frac{-890KJ/mole}{1mole}\times 3.73mole=-3319.7KJ of energy

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5 0
3 years ago
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3 years ago
A sample of an unknown substance has a mass of .158 kg if 2,510 J of heat is required to heat the substance from 32°C to 61°C wh
ziro4ka [17]

Answer: 0.548J/g°C

Explanation:

Q = s × m × DeltaT

Q = Heat (J)

S = Specific Heat Capacity

M = mass (g)

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7 0
3 years ago
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