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2 years ago

Okay So Blink your eyes. Was work done? Explain your answer.

Chemistry

2 answers:

Yuri [45]2 years ago

7 0

Answer:

no work was needed. Blinking does not require using energy sometimes we blink without thinking.

Explanation:

yarga [219]2 years ago

5 0

Answer:

Yes work was done because muscles in your body contract and relax to make you move and blink. To just smile you use 32 or 36 muscles. The simplest movements are also sometimes to most complex.

Explanation:

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What disposal or industrial process uses sieving to separate mixtures?

3241004551 [841]

The process referred to here is <u>filtration.</u>

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2 years ago

An example of hydrogen bonding would be the attractions between outer hydrogen atoms and the central nitrogen atom within the NH

marshall27 [118]

Answer:

The answer to your question is: false.

Explanation:

Hydrogen bonding is tha attraction of hydrogen atoms to the oxygen or nitrogen of a different molecule not between the atoms of the same molecule.

So this description of hydrogen bonding is incorrect.

7 0

3 years ago

Read 2 more answers

Suppose a system of two particles, represented by circles, have the possibility of occupying energy states with 0, 10, or 20 J.

MrMuchimi

Answer:

Explanation:

The possible energy states for the particles are 0, 10 and 20 J.

The constraint in the system is that the total energy of the particles must be 20 J.

One given configuration where the total energy is 20 J is if both the particles occupy the 10 J state.

Hence, (10;10) is the given configuration.

Another possibility is if one of the particle is in 0 J state and another is in 20 J state. Hence, the system has a total energy of 0+20 = 20 J.

Hence, the possible configuration can be written as (0;20) or (20;0) which are energetically equivalent to the given configuration. Note that if the circles are indistinguishable, then the configuration (0,20) and (20,0) is the same thing.

4 0

3 years ago

Which pair of atoms has the highest electronegativity difference?

melamori03 [73]

O - H
_____________________________________________________

7 0

3 years ago

Read 2 more answers

The concentration of a biomolecule inside a rod-shaped prokaryotic cell is 0.0047 m. calculate the number of molecules inside th

melisa1 [442]

First find the volume:

length = 3.8 um
diameter = 1.6 um
so, radius = 1.6 / 2 = 0.8 um

so, volume = $\pi r^2 l$
= $3.14 \times 0.8^2 \times 3.8$
$Volume= 7.63 um^3$

1 um = 10^{-6} m
convert volume into m^3
so, $Volume= 7.63 um^3$ = $7.63 \times (10^{-6})^3 = 7.63 \times 10^{-18} m^3$

Now, Concentration is always in moles/Litre. So, we need to change the volume to litre.
1 m^3 = 10^{-3} L
So, $7.63 \times 10^{-18} m^3 = 7.63 \times 10^{-18} \times 10^{-3}L = 7.63 \times 10^{-21}L$

Now, number of moles = concentration x volume
= $0.0047 \times 7.63 \times 10^{-21}= 3.5 \times 10^{-23}$

so no. of molecules = $3.5 \times 10^{-23} \times 6.022 \times 10^{24} = 210$

4 0

3 years ago