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3 years ago

If element x has 55 protons how many electrons does it have

Chemistry

2 answers:

kolbaska11 [484]3 years ago

7 0

Answer: 55

Explanation: A atom consists of a nucleus and electrons.Nucleus contain neutrons with no charge and protons with positive charge. The electrons bearing negative charge revolve around the nucleus.

An electrically neutral atom contains equal number of protons and electrons. Thus if a neutral element X contains 55 protons, it also contains 55 electrons.

elena55 [62]3 years ago

6 0

If the element has 55 protons it is celcium and it also has 55 electrons. It has an atomic mass of 133 (132.9) so to get the number of neutrons you subtract the atomic mass and the number of protons.

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mel-nik [20]

The maximum radiation pressure exerted by sunlight in space on a flat black surface is 4.5 × $10^{-6}$ P a. So, the correct option is (b).

Radiation pressure is the name for the force electromagnetic wave particles exert on a surface. It is inversely related to the wave's speed. Given data

Solar constant ( S ) = 1350W / m ^2

Now, the radiaton pressure is given by

P = 2 S /c

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P = 2 × 1350 /3 × 10 ^8

P = 9 × $10^{-6}$ P a

For a black surface, P = 4.5× $10^{-6}$ P a

Therefore, maximum radiation pressure exerted by sunlight in space on a flat black surface is 4.5 × $10^{-6}$ P a

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What is the specific heat capacity of an unknown metal if 75.00 g of the metal absorbs 418.6J of heat and the temperature rises

EleoNora [17]

Answer:

The specific heat capacity of the unknown metal is 0.223 $\frac{J}{g*C}$

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

There is a direct proportional relationship between heat and temperature. The constant of proportionality depends on the substance that constitutes the body as on its mass, and is the product of the specific heat by the mass of the body. So, the equation that allows calculating heat exchanges is:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Q= 418.6 J
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Replacing:

418.6 J= c* 75 g* 25 C

Solving:

$c=\frac{418.6 J}{75 g*25 C}$

c= 0.223 $\frac{J}{g*C}$

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DENIUS [597]

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