CHEMISTRY COMMUNITY

Jina Kwon

Why is it unlikely that 4 molecules collide simultaneously?

Jina Kwon

Why is the slowest step considered the rate determining state?

Jina Kwon

What's the difference between kinetics and thermodynamics when controlling a reaction?

Jina Kwon

Do molecules have higher kinetic energy with higher temperatures?

Jina Kwon

When you're modeling a reaction using the Arrhenius theory, why will the plot be linear?

Jina Kwon

How can the rate of formation relate to the rate law?

Jina Kwon

How does the steady-state approximation relate to the net rate of formation?

Jina Kwon

What exactly is the net-rate of formation?

Jina Kwon

for 2 N2O5 ---> 4 NO2 + O2
why is the rate law: kr[N2O5]

for 2 HI ---> H2 + I2
why is the rate law: kr[HI]2

how come for the reaction, the reactant is not squared?

Jina Kwon

do you use platinum when one is solid and the other is aqueous or gas?

Jina Kwon

When we reverse the reaction does the standard cell potential become negative?

Jina Kwon

Do we need to know about corrosion for test #2? Also, are we going to be tested on kinetics?

Jina Kwon

In this question, where did KOH come from?

Jina Kwon

Why is an inert electron such as Pt necessary when both oxidized and reduced species are in the same solution?

Jina Kwon

I don't really understand the concept of hydrogen electrodes and how it relates to half cells

Jina Kwon

in this case, what does standard conditions mean?

Jina Kwon

Where can we see these types of cells applied in real life?

Jina Kwon

Why do we use platinum as a conductor?

Jina Kwon

do we use 0.0821 or 8.314 when using this equation?

Jina Kwon

What is the exact purpose of the salt bridge?

Jina Kwon

What R constant do we use fort this equation?

Jina Kwon

What does the boltmann equation account for? Is it related to resonance structure?

Jina Kwon

In comparison to G = H - TS, what other use do we have in using this equation?

Jina Kwon

If it's a monoatomic gas and there's both constant pressure and volume would I use 3/2R or would I use 5/2R?

Jina Kwon

In this problem, why is the entropy and internal energy 0?

Jina Kwon

What does a specific heat capacity mean?

Jina Kwon

What property of enthalpy allows Hess's law to be used?

Jina Kwon

what does the bond enthalpy mean when it has one dashed line and one solid line?

Jina Kwon

For this problem, where did N2(g) + (5/2)(O2) (g) --> N2O5(g) come from?
Why do we need to find this when we're trying to find the enthalpy of formation of N2O5?

Jina Kwon

In this problem, why is N2 gas and O2 gas excluded from the equation?

Jina Kwon

How does the equation U = qp + w directly relate to the First law of Thermodynamics?

Jina Kwon

I'm kind of confused on what standard enthalpy exactly means

Jina Kwon

When do we use the Boltzmann Equation?

Jina Kwon

When we do we use this integral?

Jina Kwon

I'm a little confused on the concept of microstates

Jina Kwon

I'm having a hard time understanding the conceptual aspects of standard enthalpy.

Jina Kwon

what does a bomb calorimeter do?

Jina Kwon

Air in a bicycle pump is compressed by pushing in the handle. The inner diameter of the pump is 3.0 cm and the pump is depressed 20. cm with a pressure of 2.00 atm. (a) How much work is done in the compression? (b) Is the work positive or negative with respect to the air in the pump? (c) What is the...

Jina Kwon

what is the exactly equation used to calculate work

Jina Kwon

Calculate the pH of (a) 0.19 m NH4Cl(aq); (b) 0.055 m
AlCl3(aq).

how do you do part b of this problem

Jina Kwon

Which direction does the reaction go when there's increased pressure?

Jina Kwon

I'm a little confused on this concept, but are most acid/base reactions at equilibrium?

Jina Kwon

I keep getting the answer wrong to this question: At 25 8C, K 5 3.2 3 10234 for the reaction 2 HCl(g) ∆
H2(g) 1 Cl2(g). If a reaction vessel of volume 1.0 L is filled with
HCl at 0.22 bar, what are the equilibrium partial pressures of HCl,
H2, and Cl2?

Jina Kwon

(a) In an experiment, 2.0 mmol Cl2(g) was sealed into a reaction vessel of volume 2.0 L and heated to 1000. K to study its dissociation into Cl atoms. Use the information in Table 5G.2 to calculate the equilibrium composition of the mixture. (b) If 2.0 mmol F2 was placed into the reaction vessel ins...

Jina Kwon

A reaction vessel of volume 0.500 L at 700. K contains 1.20 mmol SO2(g), 0.50 mmol O2(g), and 0.10 mmol SO3(g). At 700. K, Kc 5 1.7 3 106 for the equilibrium 2 SO2(g) 1 O2(g) ∆ 2 SO3(g). (a) Calculate the reaction quotient Qc. (b) Will more SO3(g) tend to form? I keep getting the wrong answer for th...

Jina Kwon

How does the gas law apply to chemical equilibrium?

Jina Kwon

What units do you use for partial pressure of gas?

Jina Kwon

Why don't we use solids and liquids in equilibrium expressions?

Jina Kwon

I'm still little bit confused between Q and K. When do you use each one?

Jina Kwon

For question 5G11, why are some answers written with P and why are some answers written with brackets?

Jina Kwon

How much biology do we need to know for ligands and coordination compounds?

Jina Kwon

What is the reaction for acid rain?

Jina Kwon

How do you know whether a ligand is a chelate or not?

Jina Kwon

When naming ligands, when do we use -ate at the end?

Jina Kwon

I'm really confused on how to know a ligand is a polydentate or a monodentate? Is there an easy way to figure this out?

Jina Kwon

In which environments do amphoteric compounds act as acids and which environments do they act as bases?

Jina Kwon

Is coordination number based off the the number of lone pair of electrons?

Jina Kwon

I don't have a clear understanding of acidic oxides and basic oxides - what are they and what purpose do they serve?

Jina Kwon

How strong are ligands in comparison to intermolecular bonds?

Jina Kwon

How come water is a monodentate ligand?

Jina Kwon

How does repulsion contribute to definite size and shapes?

Jina Kwon

what is the difference between dipole induced dipole and dipole-dipole ?

Jina Kwon

for cations, is it the smaller the molecule the higher the polarity?

Jina Kwon

Why does butanol have a higher boiling point than diethyl ether?

Jina Kwon

Why does CHI3 have a higher boiling point than CHF3?

Jina Kwon

How does intermolecular forces relate to viscosity and surface tension?

Jina Kwon

Can someone clear up what an Ion-Dipole is because I don't think we learned this in class

Jina Kwon

I don't really understand the purpose of the interaction potential energy equation. Do we need to know this for future tests?

Jina Kwon

What is the difference between trigonal planar and tetrahedral?

Jina Kwon

What is the difference between a bent and angular shape?

Jina Kwon

what is the relationship between frequency and the ejection of electrons ?

Jina Kwon

Can we use this equation for light waves?

Jina Kwon

which one is actually stronger, covalent or ionic bonds?

Jina Kwon

what is the difference between intermolecular forces and intramolecular forces?

Jina Kwon

Out of the list of intermolecular forces, what's the order of weakest to strongest?

Jina Kwon

Which bonds have the most energy in comparison to others?

Jina Kwon

What happens when A and B have a bond, but one is more electronegative in comparison to the other?

Jina Kwon

What is the major difference between sigma and pi bonds?

Jina Kwon

If they have the same energies, why do the different resonance structures matter?

Jina Kwon

What causes a molecule to have an octet exception?

Jina Kwon

For the answer to this question, why is it [Ar]3d^10

Jina Kwon

Are covalent bonds stronger or ionic bonds and why? Does this also relate to electronegativity?

Jina Kwon

I'm kind of confused how the electric dipole moment is related to electronegativity?

Jina Kwon

Do different resonance structures imply different scientific meanings or does it not matter what resonance structure a molecule is in?

Jina Kwon

What are the octet exception examples that we usually need to know on tests?

Jina Kwon

What is the difference between Balmer and Lyman series?

Jina Kwon

Does the photoelectric effect work differently with diverse types of metals?

Jina Kwon

How come the wave-particle duality makes you unable to determine the specific location of electrons?

Jina Kwon

I'm just a little bit confused on the concept of black body radiation. What role does it play in the concept of incandescence?

Jina Kwon

Question 1A: 3 .I don't understand why the extent of the change in the electrical field at a given point decreases when the frequency of electromagnetic radiation decreases. Is it because when frequency increases, there's more change in the electrical field

Jina Kwon

I get that electromagnetic radiation has wave-particle duality, but where do the idea of photons come from?
Does that mean photons have characteristics relating to both waves and particles?

Jina Kwon

Does a greater energy difference imply a higher or lower frequency?

Jina Kwon

How do we determine minimum frequency required for electrons to be ejected?

Jina Kwon

Do we need to know the specific experiments that determined the properties of light because I feel like we didn't go over them in detail during class

Jina Kwon

For one question I got the answer 13.8, but the answer is 13.5. Will I be docked off a lot of points for this?

Jina Kwon

In which specific cases do we use Molality and which cases do we use molarity? Do they imply the same meaning in terms of calculating solution concentration?

Jina Kwon

For significant figures, does it matter how many sig figs you choose to use? Will anyone care if you choose to use four sig figs rather than three as long as you're being consistent?

Jina Kwon

What is the difference between chemical formula, molecular formula, and structural formula?

Jina Kwon

What are the differences between atomic weight, molecular weight, and formula weight.

Jina Kwon

If a chemical reactions' coefficients are unable to balanced, can we use fractions to balance the equation?

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