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Anna71 [15]
3 years ago
5

Which of the following best represents potential energy being converted to kinetic energy? (2 points) The chemical energy in a b

attery is used to power a cell phone. The movement of wind turns a windmill that generates electricity. A man pedals a bicycle to ride across town. A woman kicks a soccer ball and scores a goal.
Chemistry
2 answers:
ziro4ka [17]3 years ago
6 0
A women kicks a soccer bal and scores a goal
valentina_108 [34]3 years ago
3 0

Answer: Option (d) is the correct answer.

Explanation:

Potential energy is defined as the energy present in an object due to its position.

Kinetic energy is the energy obtained by an object due to its motion. For example, a woman kicks a soccer ball and scores a goal.

When a work is done by an object due to its position or motion then this is known as mechanical energy. For example, the movement of wind turns a windmill that generates electricity.

When chemical energy is utilized to generate electrical energy in an electrochemical cell then it is known as electric current. For example, the chemical energy in a battery is used to power a cell phone.

Thus, we can conclude that a woman kicks a soccer ball and scores a goal, best represents potential energy being converted to kinetic energy.

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Is facilitated diffusion passive or active transport?
bazaltina [42]

Answer:

Its passive

Explanation:

Facilitated diffusion is a type of passive transport that allows substances to cross membranes with the assistance of special transport proteins.

6 0
3 years ago
Silicon carbide (SiC) is an important ceramic material made by reacting sand (silicon dioxide, SiO2) with powdered carbon at a h
makkiz [27]

Answer:

Percent yield of SiC is 77.0%.

Explanation:

Balanced reaction: SiO_{2}+3C\rightarrow SiC+2CO

Molar mass of SiC = 40.11 g/mol

Molar mass of SiO_{2} = 60.08 g/mol

So, 100.0 kg of SiO_{2} = \frac{100.0\times 10^{3}}{60.08} moles of SiO_{2} = 1664 moles of SiO_{2}

According to balanced equation, 1 mol of SiO_{2} produces 1 mol of SiC

Therefore, 1664 moles of SiO_{2} produce 1664 moles of SiC

Mass of 1664 moles of SiC = (1664\times 40.11)g = 66743g = 66.74 kg (4 sig. fig.)

Percent yield of SiC = [(actual yield of SiC)/(theoretical yield of SiC)]\times 100%

                                 = \frac{51.4kg}{66.74kg}\times 100 %

                                 = 77.0%

4 0
3 years ago
Please solve for Cu,N,and O an dif you can show how cause ik confused
belka [17]

Cu⇒ 1 atom

N⇒2 atoms

O⇒6 atoms

Total 9 atoms

<h3>Further explanation  </h3>

The empirical formula is the smallest comparison of atoms of compound forming elements.  

A molecular formula is a formula that shows the number of atomic elements that make up a compound.  

<em>(empirical formula) n = molecular formula  </em>

Chemical formula : Cu(NO₃)₂

Number of Cu : 1

Number of N : 2

Number of O = 2 x 3 = 6

Total atoms in Cu(NO₃)₂ : 1 + 2 + 6 = 9

4 0
3 years ago
A 275 g sample of a metal requires 10.75 kJ to change its temperature from 21.2 oC to its melting temperature, 327.5 oC. What is
Vlada [557]

Answer:

c=0.127\ J/g^{\circ} C

Explanation:

Given that,

Mass of the sample, m = 275 g

It required 10.75 kJ of heat to change its temperature from 21.2 °C to its melting temperature, 327.5 °C.

We need to find the specific heat of the metal. The heat required by a metal sample is given by :

Q=mc\Delta T

c is specific heat of the metal

c=\dfrac{Q}{m\Delta T}\\\\c=\dfrac{10.75\times 10^3\ J}{275\times (327.5 -21.2)}\\\\=0.127\ J/g^{\circ} C

So, the specific heat of metal is 0.127\ J/g^{\circ} C.

4 0
3 years ago
Which of the following statements is true?
pashok25 [27]
The answer is longitudinal waves more particles at right angles
3 0
4 years ago
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