With work shown
1) How many moles of H2O will be produced if 6.80 x 1024 formula
units of NH4NO3 are decomposed in the reaction given below?
NH4NO3 -------- N2O + 2H2O
2) Aspirin (C9H8O4) can be made in the laboratory by reacting
salicylic acid (C7H6O3) with acetyl chloride (C2H3ClO).
C7H6O3 + C2H3ClO-------- C9H8O4 + HCl
What mass of HCl is produced by the complete reaction of 36.0 g
of acetyl chloride?
3) Propane (C3H8) burns in oxygen to form CO2 and H2O according to
the following equation. How many grams of O2 are required to burn
3.01 x 1023 propane molecules?
C3H8 + 5 O2-------3 CO2 + 4 H2O
In: Chemistry
distinguish between analytical concentration and equilibrium concentration.
1- why do we say "error is inevitable"?
2- please distinguish between precision and accuracy .
In: Chemistry
Order these elements from MOST to LEAST reactive and explain your reasoning.
Ag, Cu, Fe, H, Mg, Ni, Pb, Sn, Zn
In: Chemistry
Solid Investigation Question:
What is the identity of an unknown solid piece of metal?
Specific questions:
1. What are the observable physical properties of your sample?
2. If provided with a table of densities of metals, how might you use this information to identify your piece of metal?
a. Given that calculating a physical constant is more reliable using a graph with multiple measurements from multiple samples than using measurements from a single sample, how could you use a graph to determine density if you are provided metal pieces of various lengths. Please note that you are required to submit a graph for your micro-project. Your graph will need to have a title, axes labels and a trendline as well as trendline equation. i
. How would you determine volume?
ii. What would you plot in order to get a slope that gives you density?
iii. What is the density of your sample?
Solution Investigation Question:
What are some of the key characteristics of unknown sample of an aqueous solution containing an ionic compound?
Specific questions: 1. Given that the cation is from Group 1A, what is the identity of the group 1A metal ion in your solution?
2. Given that the ionic compound contains either chloride or hydroxide, how can you determine which? (Two pieces of evidence are required and one must be related to solubility rules)
3. What is the concentration of your solution? (Your unknown sample is known to be about 1 M, but you need to determine the concentration to 3 significant figures using titration. You should plan ahead so that you know approximately what volume of your sample you will need in order to use approximately 25 mL of 0.100 M sulfuric acid for the titration). I'm not sure how to answer either of these problems
In: Chemistry
A reaction between substances A and B has b been found to give the following data:
[A] | [B] | Rate of appearance of C |
mol/L | mol/L | mol/L-hr |
1.0 x 10^-2 | 1.0 | 0.300 x 10^-6 |
1.0 x 10^-2 | 3.0 | 8.10 x 10^-6 |
2.0 x 10^-2 | 3.0 | 3.24 x 10^-5 |
2.0 x 10^-2 | 1.0 | 1.20 x 10^-6 |
3.0 x 10^-2 | 3.0 | 7.30 x 10^-5 |
Using the above data, determine the order of the reaction with respect to A and B, the rate law, and calculate the specific rate constant.
In: Chemistry
Given the values of ΔH∘rxn, ΔS∘rxn, and T below, determine ΔSuniv.
Predict whether or not each reaction will be spontaneous.
ΔH∘rxn=− 118 kJ , ΔS∘rxn= 261 J/K , T= 294 K
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ΔSuniv = ??? (J/K) |
ΔH∘rxn= 118 kJ , ΔS∘rxn=− 261 J/K , T= 294 K .
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ΔSuniv = ??? (J/K) ΔH∘rxn=− 118 kJ , ΔS∘rxn=− 261 J/K , T= 294 K .
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ΔH∘rxn=− 118 kJ , ΔS∘rxn=− 261 J/K , T= 565 K .
ΔSuniv = ??? (J/K)
In: Chemistry
Read up on the phenomenon called the common ion effect in your text. You add a small amount of NaOH to a test
tube containing cadmium nitrate solution. Initially nothing happens, but as you add more NaOH you begin to observe the
formation of a white, powdery solid that resembles snowflakes. Eventually, all the precipitate settles to the bottom of your
test tube.
a. Explain why you do not see the precipitate initially as you first begin to add NaOH (aq). In your explanation, discuss
the relationship between Q and Ksp at this point.
b. Explain why you eventually do see a precipitate. In your explanation, discuss the relationship between Q and Ksp at
this point.
c. Which of the following two reagents: HNO
3
or KOH, do you think will increase the solubility of cadmium hydroxide
solution? Explain your answer
In: Chemistry
for polyurethanes and epoxy polymers write out the relevant chemical reactions involved on polymerization and cross linking. Indicate the functionality of the monomers being used.
In: Chemistry
Pure magnesium metal is often found as ribbons and can easily burn in the presence of oxygen. When 3.50 g3.50 g of magnesium ribbon burns with 8.91 g8.91 g of oxygen, a bright, white light and a white, powdery product are formed.
1. Enter the balanced chemical equation for this reaction. Be sure to include all physical states.
2. What is the limiting reactant?
3. If the percent yield for the reaction is 79.9%,79.9%, how many grams of product were formed?
4. How many grams of the excess reactant remain?
In: Chemistry
1. A 2.168 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 5.607 grams of CO2 and 1.148 grams of H2O are produced. In a separate experiment, the molar mass is found to be 136.2 g/mol. Determine the empirical formula and the molecular formula of the organic compound.
2.A 6.210 gram sample of an organic compound
containing C, H and O is analyzed by combustion analysis and
10.34 grams of CO2 and
3.388 grams of H2O are produced.
In a separate experiment, the molar mass is found to be
132.1 g/mol. Determine the empirical formula and
the molecular formula of the organic compound.
3.A 0.5079 g sample of a pure soluble
bromide compound is dissolved in water, and all of
the bromide ion is precipitated as
AgBr by the addition of an excess of silver
nitrate. The mass of the resulting AgBr is found
to be 0.9007 g.
What is the mass percentage of bromine in the
original compound?
In: Chemistry
C60-->CH4+CO3^2?
Give the complete balanced oxidation-reduction reaction occurring in acidic solution.
In: Chemistry
correct the mistakes in this statement
A vacancy is a point defect that occurs when an atom is missing from a lattice position. A perfect metal crystal would exhibit ductile behavior. Amorphous crystals have long range order which can be measured by x-ray diffraction. X-ray crystal structure determination and the iridescent colors in nacre, butterfly wings, and beetle exoskeletons are caused by similar phenomena that involves the transmission of visible light. Metals tend to be harder than polymers, ceramics tend to be stronger than polymers, and metals tend to be harder than ceramics. Diamond is a unique material that exhibits metallic bonding. One of its more unusual features is that although it has a very high electrical conductivity, it is a poor conductor of heat.
In: Chemistry
balance potassium permanganate and oxalate redox reaction
In: Chemistry
When the partial pressure of O2 in venous blood is 30 torr, the saturation of myoglobin with O2 is ______ while the saturation of hemoglobin with O2 is ______.
a. 0.55, 0.91
b. 0.91, 0.55
c. 2.8 torr, 26 torr.
d. 0.91, 0.97
e. none of the above
please show your work, thanks!
In: Chemistry
what significance does electronic notation have to the study of plastics?
In: Chemistry