bekah

can you just show me how to set this up? or a formula that could help? im confused. The length of a rectangle is increasing at 3 ft/min and the width is decreasing at 2 ft/min. When the length is 50 ft and the width is 20 ft, at what rate is the rectangle...

14 years ago

Joe stands on a bridge kicking stones into the water below. If he kicks a stone with a horizontal velocity of 3.10 m/s, and it lands in the water a horizontal distance of 6.60 m from where Joe is standing, what is the height of the bridge? Enter m as unit...

13 years ago

n+3.4<5.8

11 years ago

Consider the titration of 50.0 mL of 0.200 M HOCl by 0.200 M KOH for the next five questions (Ka for HOCl = 3.5 x 10-8). Calculate the pH after 150.0 mL of KOH has been added.

11 years ago

Consider a buffer solution consisting of CH3NH3Cl and CH3NH2. Which of the following statements are true concerning this solution? (Ka for CH3NH3+ = 2.3 x 10 -11). 1. A solution consisting of 0.1 M CH3NH3Cl and 0.1 M CH3NH2 would be a more effective buffe...

11 years ago

enzoic acid is a weak monoprotic acid with Ka = 6.5×10-5 M. NaOH(s) was gradually added to 1.00 L of 8.66×10-2 M benzoic acid. 1. Calculate the pH of the solution before the addition of the base. 2. Calculate the pH of the solution after the addition of 5...

11 years ago

Select only the True statements about buffer systems. Select all that are True. 1. Starting with NH3(aq) and adding a small amount of HCl(aq) will make a buffered solution. 2. The blood buffer, among other things, is supported by carbonic acid and its con...

11 years ago

A 1.0 M acetic acid solution (CH3COOH, pKa = 4.7) is neutralized by dissolving NaOH(s) (a strong base) in the solution. Estimate the pH at the equivalence point of the neutralization process: 4.7 7.0 9.3 Which one of the following statements best explains...

11 years ago

If my original sample contained 7.1 grams of potassium chlorate. How many moles of oxygen gas would I expect to have evolved? Hint: Convert grams to moles of potassium chlorate, then use the mole ratio in the balanced equation. Balance this equation KClO3...

11 years ago

My original sample of mixed salt had a mass of 8.9 grams. After heating the mixture in the crucible and weighing it multiple times my final mass of salt ended up being 4.9. How many moles of oxygen were driven off? Lost on how to do this been a while sinc...

11 years ago

It is possible to manipulate the solubility of some compounds through pH adjustments. What is the appropriate pH that will yield a Molar solubility for Mg(OH)2 of 2.51 x 10-8? The Ksp for Mg(OH)2 is 1.2 x 10-11. (Hint: you may assume the concentration of...

11 years ago

A 1.0 L solution has 10.00 grams of CaCl2 dissolved in it. What is the Molar solubility of AgCl in this same solution? The Ksp for AgCl is 1.6 x 10-10 at this temperature. Hint: watch out for the common ion again.

11 years ago

Adding a complex ion forming species to a solution will increase the solubility of a slightly soluble species. Calculate the Molar solubility (s) of AgI in a 1.75 M ammonia solution. The Ksp for AgI is 8.3 x 10-17 and the Kf for Ag(NH3)2+ is 1.5 x 107. I...

11 years ago

What is the standard entropy of reaction, the standard entropy of reaction, in J/K, for the combustion reaction of ethylene described in the previous questions? The temperature is 298.15K. (Enter your answer as a signed number in scientific notation witho...

11 years ago

Under standard conditions, the Gibbs free energy of the reactants G,std(reactants) in a reaction in the gas phase is 232.94 kJ and the Gibbs free energy of the products G,std(products) is 211.56 kJ. Calculate the value of the equilibrium constant for this...

11 years ago

Use the following pair of reduction half-reactions to design a galvanic cell. Then write in the proper coefficient for each of the species involved in the overall reaction. Water molecules and protons are not shown in the half-reactions, but may be needed...

11 years ago

Consider the following standard reduction potentials of some commonly used metals: ξo (V) Au3+ (aq) + 3 e- → Au (s) +1.50 Ag+ (aq) + e- → Ag (s) +0.80 Cu2+ (aq) + 2e- → Cu (s) +0.34 Fe3+ (aq) + 3e- → Fe (s) -0.036V Al3+ (aq) + 3e- → Al (s) -1.66 Mg2+ (aq)...

11 years ago

Construct a galvanic (voltaic) cell from the half reactions shown below. Au3+ + 3 e- → Au (s) ξo= 1.420 V Br2 (l) + 2 e-→ 2 Br- (aq) ξo= 1.087 V Calculate the equilibrium constant (K) for this cell. Assume that the temperature is 298K. First, consider wha...

11 years ago

For the reaction, shown below, determine which statements are True and which are False. 3Fe(s) + Cr2O72-(aq) +14H+(aq) → 3Fe2+(aq) + 2Cr3+(aq) + 7H2O(l) ξo=1.77V 1. The oxidizing agent is dichromate (Cr2O72-). 2. The iron half-reaction takes place in an a...

11 years ago

How many grams of copper will be deposited at the cathode of an electrolytic cell if a current of 680.0 mA is run through a 2.5 M solution of copper sulfate for 20.0 minutes?

11 years ago

The cell shown above is a concentration cell. Both cells contain a copper solution and have copper electrodes. The only driving force for this cell is the difference in the concentration of the copper solutions. The system will react to equalize the conce...

11 years ago

For each organic compound, determine if it is an alkane, alkene, or alkyne. (No ringed structures and only one multiple bond per structure.) 1. C10H18 - alkyne 2. C15H32 - alkane 3. C20H40 - alkyne 4. C5H10 - alkene 5. C3H6 - alkene 6. C7H16 - alkane I am...

11 years ago

This type of functional group is often sweet smelling and may be used as a fragrance. When it reacts with water it will produce a carboxylic acid and an alcohol. I chose ester but it is wrong

11 years ago

This functional group can be generated by oxidation of an aldehyde. Oxidation is just the reaction with oxygen, but unlike combustion you are not producing carbon dioxide and water.

11 years ago

Match the name or structure with its functional group. Each molecule has only one functional group. My choices are alkane, alcohol, alkyne, carboxylic acid, alkene, aldehyde, ketone, ester, and ether. 1. 2-propanol- alcohol 2. 2-methoxypentane- alkane 3....

11 years ago

1. Art enabled new understandings in this field 2. Credited with being the founder of Renaissance painting in the Netherlands 3. his most famous painting depicts sin and redemptionhe 4. brought Germany into the mainstream of Renaissance art 5. objects app...

11 years ago

1. art enabled new understandings in this field (the protestant reformation) 2. credited with being the founder of Renaissance painting in the Netherlands distance 3. his most famous painting depicts sin and redemption (genre) 4. he brought Germany into t...

11 years ago

1. During the ______, the writings and art of Ancient Greeks were rediscovered. 2. ______ is the study of religious faith, practice and experience. 3. Renaissance thinkers promoted _______, individualism, and secularism. 4. _______ is the idea that people...

11 years ago

1. the center of the Renaissance 2. written backwards 3. da Vinci apprenticed for this person 4. innovative High Renaissance architect 5. the quintessential Universal man 6. city where da Vinci painted The Last Supper 2. Codex Leiceister 3. Donato Bramant...

11 years ago

How long does it take for 10.0 g of a radioactive isotope to decay to 1.25 g if its half-life is 17.0 d?

11 years ago

A sample of radon has an activity of 80,000 Bq. If the half-life of radon is 15 h, how long before the sample's activity is 5,000 Bq?

11 years ago

If a radioactive sample has an activity of 8.33 Bq, how many disintegrations per second are occurring?

11 years ago

The half life of Am-241 is 432 y. If 2.00 g of Am-241 is present in a sample, what mass of Am-241 is present after 1000.0 y?

11 years ago

A typical dose of a radioactive sample is 27.0 mCi. How long does it take for the activity to reduce to 0.100 mCi? The half life of the sample is 211,000 y.

11 years ago

which of the following ions are formed when AgNO3 dissociates? a. O2- b. N3- c. AgN2- d. NO3- e. N2-

11 years ago

how many moles of HCl will be produced when 30g of H2O are reacted according to the chemical equation 2AlCl3 + 3H2O -> Al2O3 + 6HCl? (molar masses are H2o=18.015g and HCl=36>46g)

11 years ago

the molar mass of NaCl is 58.45g. How many molecules does a gram of NaCl contain?

11 years ago

Consider the chemical reaction, 2Al + 3Cl2 → 2AlCl3. Here, 56 g of Al can produce 415.14 g of AlCl3 (Molar masses: Al = 26.98 g; Cl = 35.45 g). true or false

11 years ago

consider the chemical reaction, 2Al + 3Cl2 -> 2AlCl3. here, 212.7 g of chlorine can produce a maximum of 266.66 g of AlCl3 (molar mass of Al = 26.98 g and Cl = 35.45 g) true or false

11 years ago

In a chemical reaction, A and B reacts to form D. C is the intermediate product of this reaction. Percent yield of the reaction A+B->C is 50% and the percent yield of the reaction C->D is 90%. How many moles of D can be produced when 14 moles of A and B r...

11 years ago

Consider the unbalanced chemical reaction Al + Cl2 → AlCl3. How many moles of AlCl3 can be obtained from 360 grams of Cl2? (Molar masses: Cl = 35.45 g/mol, Al = 26.98 g/mol) when i balance the equation i get 2Al+3Cl2->2AlCl3 but when i try to figure out t...

11 years ago

H2 stored in a 50.0 L container has a pressure of 500.0 torr. O2 stored in a 25.0 L container has a pressure of 800.0 torr. If both these gases are released together to be stored in a 100.0 L container, what is the total pressure in the 100.0 L container?

11 years ago

A sample of gas has a volume of 50 mL and an initial temperature of 380 K. The temperature must be changed to _____ K in order to halve the volume. Assume constant pressure and amount for the gas.

11 years ago

the work done by a gas when it expands to 96 L is 4100 J. if the external pressure is 2.0 atm, determine the initial volume of the gas.

11 years ago

if the delta h for the reaction A + 2B -> C is 150 kj, delta h for 6A + 12B -> 6C is what?

11 years ago

given the thermochemical equations, B2O3 + 3H2O -> 3O2 + B2H6 delta h = -2035 kj H2O -> H2O delta h = 44 kj H2 + 1/2O2 -> H2O delta h = -286 kj 2B + 3H2 -> B2H6 delta h = 36 kj what is the delta hf for 4B + 3O2 -> 2B2O3?

11 years ago

A 20.0% (w/w) aqueous solution of NaOH has a density of 1.125 g/cm^3. What is the molarity (M) of this solution?

10 years ago

1.70 L of 0.550 M H2O2 reacts according to the following reaction. 2H2O2(aq) -> 2H2O(l) + O2(g) How much H2O is formed? (molar mass of H = 1.00 g/mol O = 16.0 g/mol)

10 years ago

When Mg reacts with HCl, it produces MgCl2 and H2(g). If 2.34 g of Mg react, how much MgCl2 is produced (in grams)?

10 years ago

An award is being plated with pure gold before it its presented to a recipient. If the area of the award is 55.0 cm^3 and will be plated with 3.00 micrometers of Au, what mass of Au will be plated on the award? The density of Au is 19.3 g/cm^3.

10 years ago

balance the reaction using the half reaction method. OsO4 + C2H4 -> Os + CO2 worksheet does not show if it is in a gas and aqueous state.

10 years ago

thank you so much!!!!

14 years ago

i figured it out

11 years ago

i am using dG=dH-tdS and i have tried dG-dH/T,dG/dH+T,dG/dH-T. My answers are -1.33,-1.0E3, -1.01E2

11 years ago

the answers i have tried are F,F,T,T and F,F,T,F

11 years ago

Distance Parallel Vanishing Hieronymus bosch Jan van Eyck Albrecht Düre Mathematical polyptch

11 years ago

Thanks I have all except 3 and 4, can you help me with those please?

11 years ago

This is different questions. I never got answers to these. I have 1 through 4. I need help on the rest.

11 years ago

I have 7 also

11 years ago

Oops that's Albert durer

11 years ago

3. Humanism 4. theology 1. Renaissance 5. Italy Printing press Protestant 2. Secularism 9.Paper relief Mapmaking

11 years ago

Number 2 is Albert durer

11 years ago

You told me 1 and 3 but thank you so much.

11 years ago

Thanks I figured it out. Thanks for all your help tonight.

11 years ago

i have know idea how to even figure it out with just volume 1 and temp 1. i have tried multiple ways with the equation but not getting anywhere

11 years ago

this is what was on my worksheet

10 years ago