Category: Chemistry

Additional Questions (Show Work)
1. What is the density of a 65.00-g object that is immersed in a graduated cylinder whose
water volume rises from 28.3 mL to 45.6 mL?
2. A flask that weighs 218.5 g is filled with 125.5 mL of NaCl solution. The total weight of the
flask and NaCl solution is found to be 354.6 g. Calculate the solution density.
3. Three beakers contain different volumes of water of 8.1 cm3, 0.64 L, and 2.7 dL. If all
three volumes were mixed together in a larger container, what would the final volume in
milliliters be?
4. What is the volume of a 0.240-lb sample of ethyl alcohol if its density at the temperature
in question is 0.739 g/mL?
5. The usual dose of amoxicillin for children and babies older than 3 months, who weigh
less than 40 kg, is 20 to 40 milligrams (mg) per kilogram (kg) of body weight per day,
divided and administered every 12 hours. If the drug amoxicillin is 125 mg / 2.5 mL oral
suspension, how many teaspoons in 24 hours should be given to a child who weighs 54
pounds for the maximum dose? (One teaspoon is 5 mL)

Select a source of chemistry information from the open web (the topic can be any topic related to chemistry or that of your research topic).
Evaluate the source and explain why it is or is not a credible source of information.
Provide a reference in APA format.
Use the name of your source as the title of your discussion post. You cannot use a source that one of your classmates has already used as a topic for their initial discussion post.

Select a source of chemistry information from the open web (the topic can be any topic related to chemistry or that of your research topic).
Evaluate the source and explain why it is or is not a credible source of information.
Provide a reference in APA format.
Use the name of your source as the title of your discussion post. You cannot use a source that one of your classmates has already used as a topic for their initial discussion post.

Answer the questions
Write your answers out and upload your submission; you do not have to include the questions.
Type your answers directly into the submission box.
Save your exam as a Word (.doc) document, PDF, or JPEG image and submit as an attachment below when you are ready to submit the exam to be graded.
It is very important that you show your work for this exam. You can receive partial credit for answers to some questions.
If you are unable to open/edit the Word document, you can download the PDF document of the semester exam and type your answers into the submission box or type or write your work in another document.

This is a research proposal. Please follow the attached template. Once accepted a detailed 12 page extended essay needs to be submitted later.

Why is the ability to solve problems important in the study of chemistry? Why is it that the method used to attack a problem is as important as the answer to the problem itself?

Part 1.
Using the data and observations in the table below, create a heating curve for hydrogen that Dr. Wong can reference during his laboratory testing. Be sure to include and label the following items in your heating curve:
Create temperature and time intervals that are appropriate for the data.
Don’t start the temperature on the graph at 0 °C because the time intervals will be too large for the hydrogen data.
Label the melting and boiling points on the curve.
Label the three states and the two transition phases on the curve.
Heating data:Time (Minutes)Observations
0:00Hydrogen is a solid at −263 °C. Heat is added to sample.
2:43Hydrogen begins to change into a liquid at −259 °C.
6:15Temperature of the liquid begins to increase.
10:36Hydrogen begins to form a gas at −253 °C.
14:01Temperature of the gas begins to increase.
18:00Final temperature of hydrogen gas is −245 °C.
Part 2.
Create a model of the atoms of a substance moving through the solid, liquid, and gas states. This can be a physical model using household or crafting items or a colorful diagram, illustration, or animation. You can be as creative as you want. Be sure to include and label the following items in your model:
the three states of matter
movement and spacing of molecules
loss or gain of kinetic energy and temperature
transfer of heat
breaking or building of intermolecular bonds
Include one paragraph to explain the movement of energy during phase transitions.

Hi,
I need a 3-4min speech about the nitric oxide chemistry during exercise. I have attached a picture and I was thinking about discussing the process. My partner is already discussing a study experiment related to this. My job is to discuss the chemistry and physiology.
However, if you have better figures/pictures please go ahead with them.
I only need 1 or 2 slides with pictures/figures:
– please make sure less information on the slides and short dot points
Obviously, I’ll need a speech on a seperate document.

First, choose a molecule used in healthcare, industry, or found in a natural source and discuss the importance of this molecule. Be sure to include at least one outside source and make sure to follow APA citation guidelines.
The electron configuration of an atom determines the number of electrons available to participate in bonding with another atom. One method of depicting the valence electrons that an atom has is through the Lewis structure.
Pick an element from the periodic table of elements. Identify the valence electrons and the orbitals in which they reside.
Minimum of 3 sources cited
APA format for in-text citations and list of references

The reaction of CrCl3 with liquid NH3 to give yellow [Cr(NH3)6]Cl3 often has a low yield,
since the reaction tends to stop with the production of pink [Cr(NH3)5Cl]Cl2. However,
adding a small piece of Na metal to the liquid NH3 results in complete conversion of the
CrCl3 to [Cr(NH3)6]Cl3. Offer two plausible explanations of this rate enhancement for the
final step of the substitution process
2- Write a hypothetical inner-sphere redox mechanism for the reaction of [Cr(OH2)6]2+ with cis-
[Co(en)2I2]+ in acid solution to give (ultimately) cis-[Cr(OH2)4I2]+, Co2+
(aq) and en. What
evidence could support this mechanism and why?
3-Consider reduction of the following cobalt complexes [Co(NH3)5(L)]3+ (L = pyridine (I),
NC5H4-p-CH2NH2 (II), NC5H4-p-CONH2 (III)) by labile [Cr(OH2)6]2+
.
a). Which cobalt complex is least likely to be reduced by an inner-sphere mechanism?
b). The reduction of III proceeds with a rate constant of k = 17.4, while the reduction of I
proceeds with a rate constant of k = 4.0 × 10-3
. What is a likely explanation of the difference?
Requirements: 1page