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m_a_m_a [10]
3 years ago
15

Which of the following has potential energy but no kinetic energy? Longitudinal sound waves An arrow shot from a bow A compresse

d spring A vibrating atom
Chemistry
2 answers:
Vikentia [17]3 years ago
3 0

Answer:

A compressed spring

Explanation:

A compressed spring has potential energy only and no kinetic energy.

This is because kinetic energy is only possessed by particles in motion.

Energy in a compressed spring= -1/2kx² where x is the displacement.

In this equation there is no velocity so there is no kinetic energy.

Masja [62]3 years ago
3 0

Answer:

A compressed spring

Explanation:

Option C is correct. The potential energy is the energy stored in a compressed spring. This potential energy depends on the spring constant and the distance traveled by the spring as it is stretched. The work that is done in stretching a spring gets stored in the compressed spring as potential energy.

Option A is incorrect. As sound wave is a mechanical wave that carries both potential and kinetic energy.  

Option B is incorrect. Arrow shot from a bow has kinetic energy.  

Option D is incorrect. A vibrating atom has vibrational energy.  

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Let given gases be 1 mole. So their volumes will be the same, 22.4 liters.

Density is the ratio of mass to volume.

By formula; density= mass/volume; d=m/V

To find out masses of gases, do the mole calculation.

By formula; mole= mass/molar mass; n= m/M; m= n*M

Molar masses are calculated as
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2. NO (nitrogen monoxide) = 1*14 g/mol + 1*16 g/mol= 30 g/mol
3. NH₃ (ammonia)              = 1*14 g/mol + 3*1 g/mol= 17 g/mol
4. H₂O (water)                    = 2*1 g/mol + 1*16 g/mol= 18 g/mol
5. SO₂ (sulfur dioxide)        = 1*32 g/mol + 2*16 g/mol= 64 g/mol
Use Periodic Table to get atomic mass of elements.

Since their volumes are equal, compounds having the same molar mass will have the same density. 
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Ethane and nitrogen monoxide have the same density.

The answer is C₂H₆ and NO.
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given                   11.8 mol    1.01 mol

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from reaction                     1 mol         2 mol

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