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4 years ago

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Chemistry

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kupik [55]4 years ago

5 0

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What is the name for the process of maintaining a stable environment within a cell?

Rudiy27

Answer:

Homeostasis.

Explanation:

Homeostasis is the process in which your body attempts to bring all functions to an equilibrium. For example:

Are you ever really hot and begin to sweat? That is your body attempting to regulate body temperature by cooling you down with sweat.

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3 years ago

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At what temperature does water become a gas?

uranmaximum [27]

The answers is d. 100o c

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4 years ago

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Given the equation C3H8(g) + O2(g) = CO2(g) + H2O(g) and that the enthalpies of formation for H2O(g) = -241.8 kJ/mol, CO2(g) = -

kari74 [83]

Answer: 72.4 kJ/mol

Explanation:

The balanced chemical reaction is,

$C_3H_8(g)+5O_2(g)\rightarrow 3CO_2(g)+4H_2O(l)$ $\Delta H=-2220.1kJ/mol$

The expression for enthalpy change is,

$\Delta H=\sum [n\times \Delta H_f(product)]-\sum [n\times \Delta H_f(reactant)]$

$\Delta H=[(n_{CO_2}\times \Delta H_{CO_2})+(n_{H_2O}\times \Delta H_{H_2O})]-[(n_{O_2}\times \Delta H_{O_2})+(n_{C_3H_8}\times \Delta H_{C_3H_8})]$

where,

n = number of moles

$\Delta H_{O_2}=0$ (as heat of formation of substances in their standard state is zero

Now put all the given values in this expression, we get

$-2220.1=[(3\times -393.5)+(4\times -241.8)]-[(5\times 0)+(1\times \Delta H_{C_3H_8})]$

$\Delta H_{C_3H_8}=72.4kJ/mol$

Therefore, the heat of formation of propane is 72.4 kJ/mol

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3 years ago

Select the correct statement (2.5 Points) (A) s-orbitals are spherical in shape. (B) P-orbitals are dumbbell in shape. (C) s-orb

Lilit [14]

Answer:

The correct option is: (D) All of the above

Explanation:

An atomic orbital is the three-dimensional space or region around the nucleus of an atom, where the probability of finding an electron is maximum.

The s-orbitals are the atomic orbitals that have azimuthal quantum number, l = 0. These atomic orbitals have spherical shape and symmetry.

The p-orbitals are the atomic orbitals that have azimuthal quantum number, l = 1. These atomic orbitals have a dumbbell shape.

The atomic orbitals that are closer to the nucleus, have lower energy. Therefore, we can say that the s-orbitals are lower in energy than the p-orbitals.

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3 years ago

What is the correct balanced chemical equation for reaction of magnesium with molecular oxygen?

Nina [5.8K]

The balanced chemical formula would be:
2Mg + O2 = Mg2O2

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4 years ago