CHEMISTRY COMMUNITY

sarahartzell1A

practice problems

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sarahartzell1A

if Ecell is positive, delta G will be negative meaning the reaction is spontaneous

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sarahartzell1A

Yeah I think you're right

sarahartzell1A

No they are not

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Exclude pure solids and liquids!

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In a reversible isothermal reaction

sarahartzell1A

Because delta s won't change in those conditions!

sarahartzell1A

When delta G is negative!

sarahartzell1A

Usually when the boiling, melting, or freezing point has been reached.

sarahartzell1A

q of the system would be equal to q of the surroundings I believe

sarahartzell1A

Typically kj or J

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HF is a weak acid!

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Just the coefficients for gaseous molecules!

sarahartzell1A

Energy is released when the bonds are formed, so it is negative as it is exothermic.

sarahartzell1A

Delta s is entropy which is change in disorder, while delta h is enthalpy.

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Pure solids and liquids are in their pure form and not dissolved in any other liquid.

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Yes, unless it is a pure solid or gas.

sarahartzell1A

If it is a gas or aqueous you include it, but if not you do not.

sarahartzell1A

The equation should be balanced.

sarahartzell1A

K is the equilibrium constant while Q is the reaction quotient.

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Maybe because it represents the molar ratio of the substances.

sarahartzell1A

You include the aqueous solutions.

sarahartzell1A

All the products/reactants have to be in the same phase for it to be considered homogeneous.

sarahartzell1A

Water is not accounted for because it is a pure liquid!

sarahartzell1A

H+ does not usually exist as a single proton and binds with water.

sarahartzell1A

Use the equation EK = h v - workfunction to solve.

sarahartzell1A

I do not think it is either, as well.

sarahartzell1A

When it is highly polarizable, this means its electron cloud has a higher chance of being distorted, usually because of the size of the anion.

sarahartzell1A

The 2 refers to the energy level of the orbital.

sarahartzell1A

Since you cannot know the exact angle, <120 is acceptable.

sarahartzell1A

Lone pairs have a larger volume of space whereas the electrons on the atoms are more restricted by the bonds so the repulsion is less.

sarahartzell1A

Sigma bonds overlap on top of each other.

sarahartzell1A

You should know the bond angles. Also, it helps to follow the outlines he posted as to what is on the test.

sarahartzell1A

It is important to pay attention to the formal charge as not all elements adhere to the octet rule.

sarahartzell1A

The double bond will still be considered one area of electron density so there is no difference in the model.

sarahartzell1A

Even if the atoms are different, it will still be planar.

sarahartzell1A

Look at bonding electrons and lone pairs of electrons around the central atom. Sulfur has four bonds and one lone pairs of electrons, so the formula is AX4E which corresponds to the see-saw shape

sarahartzell1A

It is important to make sure the formal charge is as accurate as possible but always be aware of the octet rule and its exceptions

sarahartzell1A

How do you calculate the frequency of an incident light when given the wavelength and work function (for example: if the wavelength of the ejected electron is 1.1 nm, what was the frequency of the incident light? The work function of sodium is 150.6 kj mol-1)

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Ionic bonds involve the transfer of electrons while in covalent bonds the electron is shared

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Degenerate orbitals are orbitals that have the same energy level

sarahartzell1A

The electron will be removed from 4s first since 3d has slightly higher energy.

sarahartzell1A

It might be faster when doing calculations to memorize the value, however, most constants and equations can be found on a reference sheet during an exam.

sarahartzell1A

Nothing can go faster than the speed of light, so since the model shows the velocity of the electron as being faster, it was disproved.

sarahartzell1A

E represents the energy of the photon but you can also use this equation to find the energy needed to remove the electron, just remember to pay attention to kinetic energy.

sarahartzell1A

Nothing can travel faster than the speed of light.

sarahartzell1A

When using DeBroglie's equation do you have to calculate given values into certain units before putting them into the equation?

sarahartzell1A

How do you find the number of orbitals in a sub shell when given the value of l?

sarahartzell1A

I am not sure about points but it is a good idea to write the units in your work just in case and so you know what the correct units should be at the end for your answer

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There are 4 significant figures because the zeros are in between 1s which are sig figs.

sarahartzell1A

personally, I would use the amount of each reagant to calculate the amount of moles you have then use the molar ratio to determine how many moles of each substance you need to find the limiting reactant that way.

sarahartzell1A

How do we explain how to prepare an aqueous solution when given the amount we need to prepare and a percent composition of a compound (such as in question G.7 in the sixth edition)?

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How do you write the molecular formula for a compound when given the diagram of the molecular structure? (such as in question F.1 in the sixth edition for example)

sarahartzell1A

There are some common rules you can memorize to help you find the formulas for acids and other compounds. For example, if an acid ends in "ic," it comes from an anion that ended in "ate," in this case nitrate (NO3-). Since the anion has a 1- charge, one hydrogen is needed to bala...

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