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3 years ago

Kinetic energy and gravitational potential energy are both forms of which type

Chemistry

1 answer:

scoundrel [369]3 years ago

8 0

Answer:

<em>C. Potential energy</em>

Explanation:

Kinetic energy and gravitational potential energy are both forms of potential energy. Potential energy is stored energy, when an object is not in motion it has stored energy. When an object is an motion it has kinetic energy. An object posses gravitational potential energy when it is above or below the zero height.

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According to the following electron structure, how many valence electrons do these fluorine atoms have? F= 1s12s22p5

ddd [48]

The highest sequence for this shell is the number 2, preceding both the s and p in the diagram. This means that the outermost shell is the second level shell. In this shell, there are 7 electrons, 2 in the 2s orbital and 5 in the 2p orbital.

As a side note (not sure if this is a typo), the electron structure for fluorine begins with a 1s2, not a 1s1.

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3 years ago

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A gas company in Massachusetts charges $1.30 for 15.0 ft^3 of natural gas. (a) Convert this rate to dollars per liter of gas. (b

aleksley [76]

Answer:

Explanation:

a ) 15( ft)³ = 15 ( 12 inch )³ = 15 x 12 x 12 x 12 (inch)³ = 25920 (inch)³

=25920( 2.54 cm)³ = 25920 x 2.54 x 2.54 x 2.54 cm³ =424752.7 cc

424752.7/1000 litre = 424.75 liter

424.75 liters cost 1.30 dollars

1 liter costs 1.3/424.75 = 3.06 x 10⁻³ dollars.

So rate

= 3.06 x 10⁻³ dollars/liter

b ) one liter of water takes 0.304 ft³ of gas

2.1 liter will take 0.304 x 2.1 = 0.6384 ft³ of gas

cost = 1.3 x .6384 / 15 = 0.055328 dollar = 55.33 x 10⁻³ dollar.

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3 years ago

Which of the following substances has the lowest density?

Likurg_2 [28]

Answer:

C) A mass of 750 g and a volume of 70 dL .

Explanation:

Hello,

In this case, for substantiating the substance having the lowest density we need to compute it in the same units for each case as shown below:

$\rho=\frac{m}{V}$

A) $\rho =\frac{1.5kg}{1.2L}*\frac{1000g}{1kg} *\frac{1L}{1000mL}=1.25g/mL$

B) $\rho =\frac{25g}{20mL}*=1.25g/mL$

C) $\rho =\frac{750g}{70dL}*\frac{10dL}{1L}*\frac{1L}{1000mL} =0.107g/mL$

D) $\rho =\frac{15mg}{25\mu L}*\frac{1g}{1000mg} *\frac{1000\mu L}{1mL}=0.6g/mL$

Therefore, the lowest density corresponds to C) A mass of 750 g and a volume of 70 dL

Regards.

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3 years ago

Most metals are very reactive, as are the elements in the halogen group. Aluminum, for instance, For example, reacts with elemen

steposvetlana [31]

Answer: B. you will need 53.2 g Cl2 for complete reaction and will produce 66.7 g of AlCl3.

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the moles, we use the equation:

$\text{Number of moles of aluminium}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{13.5g}{27g/mol}=0.5moles$

The balanced reaction is:

$2Al+3Cl_2(g)\rightarrow 2AlCl_3$

2 moles of aluminium react with= 3 moles of chlorine

Thus 0.5 moles of aluminium react with= $\frac{3}{2}\times 0.5=0.75$ moles of chlorine

Mass of chlorine= $moles\times {\text{Molar Mass}}=0.75\times 71=53.2g$

2 moles of aluminium produce = 2 moles of aluminium chloride

Thus 0.5 moles of aluminium react with= $\frac{2}{2}\times 0.5=0.5$ moles of aluminium chloride

Mass of aluminium chloride= $moles\times {\text{Molar Mass}}=0.5\times 133.34=66.7g$

Thus 53.2 g of chlorine is used and 66.7 g of aluminium chloride is produced.

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3 years ago

What does a weather map use to represent areas of high air pressure?

Schach [20]

A weather map used an “h” to represent areas of higher air pressure

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3 years ago

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