distinguish between analytical concentration and equilibrium concentration.

1- why do we say "error is inevitable"?

2- please distinguish between precision and accuracy .

Order these elements from MOST to LEAST reactive and explain your reasoning.

Ag, Cu, Fe, H, Mg, Ni, Pb, Sn, Zn

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

A reaction between substances A and B has b been found to give the following data:

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.

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

ΔH∘rxn= 118 kJ , ΔS∘rxn=− 261 J/K , T= 294 K .

ΔH∘rxn=− 118 kJ , ΔS∘rxn=− 261 J/K , T= 565 K .

ΔSuniv = ??? (J/K)

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

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.

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?

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?

C60-->CH4+CO3^2?

Give the complete balanced oxidation-reduction reaction occurring in acidic solution.

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.

balance potassium permanganate and oxalate redox reaction

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!

what significance does electronic notation have to the study of plastics?

1. A hot solution of a particular compound was allowed to cool to room temperature. After waiting a few minutes, it was noticed that the crystallization had not taken place. Discuss two ways to induce crystallization.

2. What properties are necessary and desirable for a solvent in order that it is well suited for recrystallizing a particular organic compound?

3. Assume that 3.0 g of aniline and 4.5 ml of acetic anhydride are used in the preparation of acetanilide. What is the limiting reagent? What is the theoretical yield of acetanilide? What is? the percentage yields if 3.3 g of acetanilide is obtained?

4. The solubility of compound A in ethanol is 0.4 g per 100 ml at 0o C and 5.0 g per 100 ml at 75 o C. What is the minimum amount of solvent needed to recrystallize an 8.0 g sample of compound A? How much would be lost in the recrystallization?

5. Impure acetanilide was dissolved in hot water. The solution was filtered hot and the beaker of solution was immediately placed in an ice-water bath instead being allowed to cool slowly. What will be the result of cooling the solution in this manner?