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3 years ago

Kernel structure for manganese

Chemistry

1 answer:

Amanda [17]3 years ago

3 0

Answer:

The nucleus consists of 25 protons (red) and 30 neutrons (blue). 25 electrons (green) bind to the nucleus, successively occupying available electron shells (rings). Manganese is a transition metal in group 7, period 4, and the d-block of the periodic table. It has a melting point of 1246 degrees Celsius.

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a molecule in a chemical reaction that has its chemical bonds broken is called the _______ in the reaction?

nika2105 [10]

Answer:

reactants

Explanation:

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3 years ago

An irregular lump of an unknown metal has a measured density of 5.50 g/mL. The metal is heated to a temperature of 153 °C and pl

Oliga [24]

Answer: $0.543J/g^0C$

Explanation:

Volume of metal = volume of water displaced = (30.0 - 25.0) ml = 5.0 ml

Density of metal = 5.50 g/ml

Mass of metal = $density\times volume =5.50\times 5.0=27.5g$

Volume of water = 25.0 ml

Density of metal = 1.0 g/ml

Mass of metal = $density\times volume =1.0\times 25.0=25.0g$

$heat_{absorbed}=heat_{released}$

As we know that,

$Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})$

$-[m_1\times c_1\times (T_{final}-T_1)]=[m_2\times c_2\times (T_{final}-T_2)]$ .................(1)

where,

q = heat absorbed or released

$m_1$ = mass of metal = 27.5 g

$m_2$ = mass of water = 25.0 g

$T_{final}$ = final temperature = ? $41.0^0C$

$T_1$ = temperature of metal = $153^oC$

$T_2$ = temperature of water = $25.0^oC$

$c_1$ = specific heat of lead = ?

$c_2$ = specific heat of water= $4.184J/g^0C$

Now put all the given values in equation (1), we get

$27.5g\times c_1\times (41.0-153)^0C=[25.0g\times 4.814J/g^0C\times (41.0-25.0)^0C]$

$c_1=0.543J/g^0C$

Thus the specific heat of the unknown metal sample is $0.543J/g^0C$

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3 years ago

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3 years ago

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Answer:

The correct answer is option 2.

Explanation:

Colligative property is defined as property which depends upon only on the numbers of particles of solute dissolved in definite amount of solvent, It do not depend on the nature of the solute.

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The following are the examples of colligative property:

1. Relative lowering of vapor pressure.

2. Osmotic pressure

3. Elevation in boiling points

4. Depression in freezing point

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3 years ago

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Answer:

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