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Serga [27]
3 years ago
9

Will make brainliest

Chemistry
1 answer:
grandymaker [24]3 years ago
4 0
A.
Increases

When a pressure increases the density usually increases too

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Which of the following best helps to why the value of Delta H degree for the CaF_2 in water in positive? A. CaF_2(s) is insolubl
FromTheMoon [43]

Answer: Option (C) is the correct answer.

Explanation:

A positive value of enthalpy or \Delta H means that energy is being absorbed from the surrounding. As CaF_{2} has strong ionic bonding between both calcium and fluorine atoms. So, to break their bond we need to provide energy to it.

So, when CaF_{2} is dissolved in warm water then warm water molecules will bombard with the stable bond of CaF_{2}. As a result, the energy will transfer from water to the bond in order to break it. And, due to loss in internal energy then there will be consequent lowering of temperature.

When this bond is broken down then the atoms will separates into gaseous ions and these ions will be then surrounded by the water molecules. As ithe bond between  CaF_{2} is very strong hence, its lattice energy will be very high.

Thus, we can conclude that the statement Ca^{2+} ions have very strong interactions with F^{-} ions in the crystal lattice, best helps to why the value of \Delta H degree for the CaF_{2} in water in positive.

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3 years ago
True or False:
Juli2301 [7.4K]

Answer:

Explanation:

From the work of Krogh in 1918 until the present time, a very wide range of values for oxygen diffusion coefficients has been reported1–5 ranging from 1.1 × 10−4 to 4 × 10−8 cm2 sec−1.

7 0
3 years ago
Which of the following lists show the elements in order, from those having the least protons to those having the most protons in
anastassius [24]

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B

Explanation:

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Heavy nuclides with too few neutrons to be in the band of stability are most likely to decay by what mode?
Margarita [4]

Answer:

Positron emission

Explanation:

Positron emission involves the conversion of a proton to a neutron. This process increases the mass number of the daughter nucleus by 1 while its atomic number remains the same. The new neutron increases the number of neutrons present in the daughter nucleus hence the process increases the N/P ratio.

A positron is usually ejected in the process together with an anti-neutrino to balance the spins.

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Which statement below best describes the relationship of the reaction below?
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For every two AB produced, the reaction requires three A
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