CHEMISTRY COMMUNITY

Tracey Tran 3I

When do we use the prefixes bis-, tris-, tetrakis- instead of bi-, tri-, tetra and why?

Tracey Tran 3I

What does porphyrin mean?

Tracey Tran 3I

How is hemoglobin made?

Tracey Tran 3I

What is the difference between an amphoteric and amphiprotic molecule?

Tracey Tran 3I

Why do nonmetal oxides not dissociate in the presence of water?

Tracey Tran 3I

Why does increasing the number of oxygen atoms make the acid stronger?

Tracey Tran 3I

Why is cisplatin used to treat cancer but not transplatin?

Tracey Tran 3I

What is the shape of a coordination compound that has 3 ligands?

Tracey Tran 3I

Why are conjugate bases of strong acids weak?

Tracey Tran 3I

Is it possible for an element or molecule to be a Lewis acid or base but not a Bronsted acid or base?

Tracey Tran 3I

What acids are we expected to know?

Tracey Tran 3I

What is a ligand?

Tracey Tran 3I

What elements/molecules are we expected to know the biological importance/function of?

Tracey Tran 3I

How do we determine oxidation number?

Tracey Tran 3I

When do we use the prefixes, bis, tris, tetrakis, pentakis?

Tracey Tran 3I

How does spreading electrons further apart make the molecule more stable?

Tracey Tran 3I

Why do lone pairs have more repulsion power than bond pairs?

Tracey Tran 3I

What is the difference between the arrangement and shape of a molecule?

Tracey Tran 3I

How do you determine VSEPR formula?

Tracey Tran 3I

Why is the bond angle of a trigonal pyramidal a little less than 109.5 degrees instead of being exactly 109.5 degrees?

Tracey Tran 3I

Are there elements that are more likely to provide the two electrons for a coordinate covalent bond? If so, why?

Tracey Tran 3I

How do we determine the bond length in resonance structures? Is it just the average of all the bond lengths?

Tracey Tran 3I

Why is a double bond not half the length of a single bond?

Tracey Tran 3I

How is a dipole induced?

Tracey Tran 3I

Are more negatively charged anions more polarizable or are less negatively charged anions more polarizable why?

Tracey Tran 3I

Why are shorter bond lengths stronger?

Tracey Tran 3I

Why are molecules with lower formal charge more stable?

Tracey Tran 3I

Why does electronegativity decrease going down the column?

Tracey Tran 3I

What is the significance of dipole moments in chemistry?

Tracey Tran 3I

How can some elements accommodate more than 8 valence electrons but others can't?

Tracey Tran 3I

Yes, we still draw lewis structures for both ionic and covalent bonds. In class potassium chloride was drawn as K+ [ Cl ]-. The Cl has 8 electrons surrounding it.

Tracey Tran 3I

Yes, it is when some lewis structures have multiple bonds in different equivalent locations.

Tracey Tran 3I

Why are H, He, Li, and Be exceptions to the octet rule?

Tracey Tran 3I

Are double bonds shorter than single bonds because they're stronger? If so, then why is the observed N-O bond length in the NO3- 1.24 A.

Tracey Tran 3I

Why are compounds with resonance considered more stable?

Tracey Tran 3I

Why do electrons in an orbital have opposite spins?

Tracey Tran 3I

What are the exceptions to electron configuration, and why do those exceptions exist?

Tracey Tran 3I

What is the purpose of a nodal plane and why does s- orbitals not have it but others do?

Tracey Tran 3I

When does m_s equal +1/2 and when does it equal -1/2

Tracey Tran 3I

Can someone explain why increasing the intensity of light does not help eject an electron again?

Tracey Tran 3I

All matter has wavelike properties, but only moving objects with extremely small mass such as electrons can be thoroughly observed/detected.

Tracey Tran 3I

The quantum number for the lower energy level is the same for every absorption line in each series. For example, the Lyman series has a lower energy level of n=1 for all of the absorption lines.

Tracey Tran 3I

The units of h, which is Planck's Constant is Js. Joules=kgm^2s^-2. Mass is in the units of kilogram, and velocity has units of m/s. Therefore you have [(kgm^2s^-2)(s)] / [(kg)(m/s)]. The kilograms cancel out: [( kg m^2s^-2)(s)] / [( kg )(m/s)]. The seconds cancel out: [( kg m^2 s^-2 )( s )] / [( kg...

Tracey Tran 3I

a) False because electrons in lower energy levels/orbitals shield electrons in higher ones due to electron repulsion. Thus, electrons in higher orbital levels experience less attraction to the nucleus. b) True c) False because electrons attraction to the nucleus decrease as l increases, decreasing t...

Tracey Tran 3I

a) Using the equation c=vλ, we can replace v in the equation E=hv with c/λ. E=hc/λ=(6.626x10^-34)(2.997x10^8)/(589x10^-9)=3.37X10^-19J b) For this problem I used dimensional analysis: 5.00x10^-3 g Na (1 mol Na/22.99g Na ) ( 6.022x10^23 atoms/1 mol Na)( 3.37x10^-19 J/ 1 atom)= 44.1 J c) Dimensional a...

Tracey Tran 3I

There is no need to directly indicate it. Just write as many digits as you consider necessary. I usually do two or three digits more than the sig figs for the final answer.

Tracey Tran 3I

In medicine it is sometimes necessary to prepare solutions with a specific concentration of a given ion. A lab technician has made up 100.0 mL of a solution containing 0.50 g of NaCl and 0.30 g of KCl, as well as glucose and other sugars. What is the concentration of chloride ions in the solution? D...

Tracey Tran 3I

If there is both multiplication/division and addition/subtraction in a problem, how do we determine the sig figs for the final answer?

Tracey Tran 3I

A molecule is aqueous if it can be dissolved in water.

Tracey Tran 3I

Can someone refresh me on how to write ionic equations?

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