# a certain reaction has the following generaln form

73,208 results, page 84

### statistics

A test has a mean of 104 and a standard deviation of 16. We want to be 98% certain that we are within 4 points of the true mean. Determine the sample size.

### Math

The distance of a car from a certain intersection after t seconds is given by d(t) = 12 + 3t - t2. When (that is, for which values of t) is the car 12 units away from the reference point?

### algebra

The distance of a car from a certain intersection after t seconds is given by d(t) = 14 + 4t - t2. When (that is, for which values of t) is the car 14 units away from the reference point?

### Physics

The nucleus of a certain type of uranium atom contains 92 protons and 143 neutrons. What is the total charge of the nucleus in Coulombs?

### Science

A certain isotope has a half-life of 12 hrs. How long will it take for 100 ƒÝgr to decay into only 25 ƒÝgr?

### Calculus

The base of a certain solid is the triangle with vertices at (-14,7),(7,7) and the origin. Cross-sections perpendicular to the y-axis are squares. What is the volume of this solid?

### physics

An electric field of 210000 N/C points due west at a certain spot. What is the magnitude of the force that acts on a charge of -6.2C at this spot?

### physics

The electric potential in a certain region is V = a x2 + b x + c, where a = 14 V/m2, b = −19 V/m, and c = 61 V. Determine the position where the electric field is zero. Answer in units of m Please help!

### chemistry

A certain rifle bullet has a mass of 6.45 g. Calculate the de Broglie wavelength of the bullet traveling at 1817 miles per hour.

### Math

When it says, "Paulo has a certain amount of money. If he spends six dollars, then he has 1/4 of the original amount left." So would the equation be n-6=1/4?

### Chemistry

The speed limit on a certain highway is 72km/h. What is the speed in cm/s? Could you go through each step on how to get the answer? Lots of the questions are like this one, but I don't know how to do them.

### physics

A certain car is capable of accelerating at a uniform rate of 0.83 m/s2 . What is the magnitude of the car’s displacement as it accelerates uniformly from a speed of 80 km/h to one of 92 km/h?

### physics

A certain car is capable of accelerating at a uniform rate of 0.83 m/s2 . What is the magnitude of the car’s displacement as it accelerates uniformly from a speed of 80 km/h to one of 92 km/h?

### maths

If a certain sum doubles itself after 3 yrs kept at simple interest. In how many yrs will it become 5 times of its value?

### physics

In a certain right triangle, the two sides that are perpendicular to each other have lengths h = 4.40 m and b = 8.70 m. What is the length of the third side of the triangle?

### trig

In a certain right triangle, the two sides that are perpendicular to each other have lengths h = 4.40 m and b = 8.70 m. What is the length of the third side of the triangle?

### math algebra

The amount A, of 70 grams of a certain radioactive material remaining after t years can be found by the equation A=70(0.62)^t. When will 10 grams remain?

### marian university college

The molar constant-pressure heat capacity of a certain solid at 4.2 K is 0.43 J K−1 mol−1. What is its molar entropy at that temperature?

### English

In a certain code TGFYWOAG means SECURITY. In the same code what does GGHHGGJS mean? A) FINANCES B) CARRIAGE C) RETAINER D) FEEDBACK

### calculus

The base of a certain solid is the triangle with vertices at (−6,3), (3,3), and the origin. Cross-sections perpendicular to the y-axis are squares. Then the volume of the solid?

### biochemistry

The enzyme alcohol dehydrogenase catalyzes the following reaction: Ethanol + NAD+ acetaldehyde + NADH + H+ You have a 1 ml solution containing 100 µM Ethanol, and 1 mM NAD+. You then add 1 mg of alcohol dehydrogenase. Assume all of the ethanol gets converted to ...

### CHEMISTRY

i need help with this pre lab question:| plse help me! teh following data were obained for the reaction 2ClO2(aq)+ 2OH^-(aq) -> ClO3^-(aq) + ClO2^-(aq) +H2O (l) Where rate = delta[ClO2]/ delta t (mol/L) (mol/L) (mol/L*s) [ClO2]0 [OH-]0 Initial rate 0.0500 0.100 5.75*10^-2 0...

### chemistry

The reaction between sodium hydroxide and hydrobromic acid is represented in the equation below: OH- + H+ -> H2O A 62.5 mL sample of 1.86 M NaOH at 22.5 deg Celsius was mixed with 62.5 mL sample of 1.86 M of HBr at 22.5 deg Celsius in a coffee cup calorimeter. The ...

### chemistry

Which of the following combinations of atomic orbitals can combine to form sigma bonds? s-ss-pp-phybrid orbital - hybrid orbitalhybrid orbital - shybrid orbital - p What is the bond angle (in degrees) resulting from sp hybridization? What is the bond angle (in degrees) ...

### Chem

Which of the following compounds are soluble? Choose at least one answer. a. BaSO4 b. K2SO4 c. KBr d. NaOH e. Al(OH)3 I originally thought it was the last four, but it isn't, or it isn't only/all of them. Aren't all sulfates and potassium soluble? What are the reactant ions in...

### Math

A piece of wire is bent to form a square of area 121cm. Calculate: a)the length of each side of the square. b)the perimeter of the square. The piece of wire is now bent to form a circle using π=3.14 Calculate: a)the radius of the circle b)the area of the circle

### chemistry

a.Given the equation: 2CaCO3 + 2SO2 + O2 -> 2CaSO4 + 2CO2 What is the actual yield of CO2 if 7.5 mol of O2 gives a percent yield of 80%? b. The pollutant sulfur dioxide can be removed from the emissions of an industrial plant by the reaction with calcium carbonate and ...

### math

Is there anywher i can go for further explanations on how to solve for the following statements on how to solve them: Dividing writing each result in simplest form & adding & subtracting I searched Google under the key words "fractions divide add subtract" to get this source: ...

### Math

The bar graph shows the cumulative number of death form AIDS in the US, from 1990 through each of the years 1996-2002. The data in the graph can be modeled by the following polynomials, in which f(x) and g(x) represent the cumulative number of AIDS deaths x years after 1990 F(...

### calculus

Evaluate h(x) for the following values of x? Consider the following function. h(x) = (tan(x)-x)/x^3 (a) Evaluate h(x) for the following values of x. (Give your answer correct to six decimal places.) x = a) 1 b) 0.5 c) 0.1 d) 0.05 e) 0.01 f) 0.005 what is f(x) (b) Guess the ...

### Chemistry

I need help finding reactions beneficial to society. Here's the assignment quoted. "Your assignment is to research two different chemical reactions that are used to address social/environmental needs or problems. These reactions must clearly be attempting to improve our world...

### Chemistry

I need help finding reactions beneficial to society. Here's the assignment quoted. "Your assignment is to research two different chemical reactions that are used to address social/environmental needs or problems. These reactions must clearly be attempting to improve our world...

### Chemistry -Dr. Bob

Reacting 1 L of H2(g) with 1 L C2H2(g) (both at STP) results in the formation of 1 L of C2H4(g) if the reaction is maintained at the same conditions (STP) and goes to completion. If this reaction produced 6.3 kJ of heat (absorbed by the surroundings), calculate: a) the PV work...

### Algebra

1. Use the Distributive Property to simplify the expression. (-1)(4-c) 2. Use the Distributive Property to simplify the expression. 4(2x -4) 3. Use the Distributive Property to simplify the expression. (10 + 4 y) 1/2 4. To which subsets of real numbers does the number -22 ...

### Algebra

1. Use the Distributive Property to simplify the expression. (-1) (4-c) 2. Use the Distributive Property to simplify the expression. 4 (2 x - 4) 3. Use the Distributive Property to simplify the expression (10+4y) 1/2 4. To which subsets of real numbers does the number -22 ...

### General Chemistry (Chem101)

A chemist mixes two liquids A and B to form a homogeneous mixture. The densities of the liquids are 2.0514 g/mL for A and 2.6678 g/mL for B. When she drops a small object into the mixture, she finds that the object becomes suspended in the liquid; that is, it neither sinks nor...

### Math

1. Find the product in simplest form 2/5 x 3/7 A. 14/15 B. 5/12 C. 6/35 D. 1/5 2. find the product in simplest form 9/10 x 5/7 A. 1 13/50 B. 9/14 C. 14/17 D. 4/7

### chemistry

In an experiment a student allowed benzene C6H6+ TO REACT WITH EXCESS BROMINE BR2+ In an attempt to prepare bromobenzene C6H5Br. This reaction also produced as a by-product, dibromobenzene, C6H4Br2+ On the basis of the equation. C6H6 + Br2 -> c6h5Br + H Br a) What is the ...

### Chemistry

In an experiment a student allowed benzene C6H6, TO REACT WITH EXCESS BROMINE BR2, in an attempt to prepare bromobenzene C6H5Br. This reaction also produced as a by-product, dibromobenzene, C6H4Br2, On the basis of the equation. C6H6 + Br2 -> c6h5Br + H Br a)What is the ...

### history

C/C between american slavery and encomienda system. The encomienda system was a form of land ownership set up after 1492 to divide both the lands and peoples of the New World into workable pieces that were run by Spanish settlers. This system was abused. The Indians were ...

### 5th grade Math

Can you check my answer? 4. Solve. 6 tenths = ___ thousandths Answer = 600 5. Write 347.392 in expanded form. Answer: (3*100)+(4*10)+(7*1)+(3* 1/10) + (9*1/100)+ (2*1/1000) 9. Write in standard form (number name) for: three thousand four hundred eight-two and sixty-four ...

### chemistry

I was way off on the other problem. But I see how you got the answer. Last one...thanks i'm learning more here thn class What is the sum of the coefficients (including “1”) of the following reaction? Sodium sulfate + calcium hydroxide ??? Write the equation (double ...

### PLEASE HELP ME ! I WILL GO NUTZ IF I DONT GET ANSR

A 6-sided number cube is rolled 300 times. The number 5 comes up 44 times. a. What is the theoretical probability of rolling a 5? Write your answer as a fraction in simplest form. b. What is the experimental probability of rolling a 5? Write your answer as a fraction in ...

### geometry

DIAGRAMS ARE HERE: type filedropper . c o m /diagrams (in .zip file) 1. which solid has two bases that are triangles and three lateral surfaces that are rectangles a. triangular pyramid b. rectangular prism c. triangular prism *** d. rectangular pyramid 2. a solid with two ...

### science

In the equation below, suppose 11 grams of Zinc (Zn) react with 12 grams of Hydrogen Chloride (2HCl) to form 16 grams of Zinc Chloride (ZnCl2) and an unknown amount of Hydrogen gas (H2). Zn + 2HCl → ZnCl2 + H2 Based on the Law of Conservation of Mass, how many grams of ...

### chemistry

I have absolutely no clue how to approach this question please help. The destruction of the ozone layer is an issue that is being discussed all around the world. Freons, or chlorinated hydrocarbon molecules, are very stable on the ground, but in the upper atmosphere, ...

### chemistry

A 40-year old man, at a prominent legal firm experiences abdominal pain post lunch. He takes several trips to the restroom, but continues to experience pain and cramps. He decides to go to the doctor and admits he consumed 2 bottles of beer @ lunch. The alcohol content (...

### algebra

Write an equation in slope-intercept form of the line that passes through the given points: (-1/2,-1), (3,5/2). Also, write an equation in point-slope form of the line that passes through the given points: (6,-3), (-1,9). <soo sick of these.. please help!> thanks!

### english

Recall that a participle is a verb form that is used an adjective. A participial phrase is a participle with its modifers and complements used as an adjective. 1. Read the following sentence. The cars passing by are filled with commuters. Which of the following sentences is ...

### Chemistry

Propane gas (C3H8) burns completely in the presence of oxygen gas (O2) to yield carbon dioxide gas (CO2) and water vapor (H2O). Write a balanced equation for this reaction. Assuming that all volume measurements occur at the same temperature and pressure, how many liters of ...

### Chemistry

Propane gas (C3H8) burns completely in the presence of oxygen gas (O2) to yield carbon dioxide gas (CO2) and water vapor (H2O). Write a balanced equation for this reaction. Assuming that all volume measurements occur at the same temperature and pressure, how many liters of ...

### Chemistry

I have a homework question that says: "Three resonance structures of the following anion are possible. One is given below, but it is incomplete. Complete the given structure by adding non-bonding electrons and formal charges. Draw the two remaining resonance structures, ...

### Chemistry

compared to an ordinary chemical reaction, a fission reaction will 1 release smaller amounts of energy 2 release larger amounts of energy 3 absorb smaller amounts of energy 4 absorb larger amounts of energy is it 2 ?

### Qauntitative Analysis for Mgmt

Your company uses 1,500 per year of a certain subassembly that has an annual holding cost of $45 per unit. Each order placed costs $150. The company operates 300 days per year and has found that an order must be placed with the supplier 6 working days before it can expect to ...

### Grammar

Adverbs modify verbs. Adjectives modify nouns. Adjective: That car is different. Adverb: He thinks differently. What happens with the following verbs and why? He looks __________ Different or differently? He sounds different or differently? The form of Different is modifying ...

### CHEMISTRY!! NEED IMMEDIATE HELP PLEASE!!!

a. Calculate the delta H, delta G, and equilibrium constant for the reaction of methane with Cl2 to give CH3Cl and HCl. Use the following information for your calculations: Bond Dissociation Energies: CH3-H (104.8kcal/mol), Cl-Cl(59.0 kcal/mol), CH3-Cl(85.0 kcal/mol), and H-Cl...

### chemistry

If your favorite silver jewelry ever tarnishes and you happen to have some aluminum foil on hand, you can actually get rid of some of that tarnish. The tarnish here is actually silver sulfide. If you put the jewelry and aluminum into a dish with enough water to cover them both...

### Algebra

a. For the first company, express in words the amount the cab company charges per ride and per mile. Charge per ride: $3 per mile $0.50 b. Write an equation in slope-intercept, point-slope, or standard form. Explain why you chose the form you did. y=3+0.50? c. What do the ...

### Math

What is 5/9 written as a decimal? 0.45 0.4 repeating 0.5 0.5 repeating What is 0.26 written as a fraction in simplest form? 26 over 100 13 over 50 26 over 10 13 over 25 In a fraction with a denominator of 15,which value could the numerator be to produce a repeating decimal? 15...

### chemistry

Subject – equilibria Pure ethanoic acid (25.0cm3, CH3COOH), pure ethanol (35.0 cm3, C2H5OH) and pure water (20.0cm3, H2O) were mixed in a sealed flask at room temperature. The flask was placed in a heated water bath and maintained at 323K until equilibrium was established. ...

### chemistry

how do I solve for: How many grams of water would be lost form 100.0grams of CuCl2 x 5H2O when the hydrated salt was heated at 1000degreesC for one hour in a crucible? What is the percent composition of water in the compound: Percentwater= 5*(2+16)/(5*18 + atomic mass Cu + 2*...

### Algebra, PLEASE HELP ME!!!

I am so lost, can anyone help me? I don't even understand what the teacher wants out of me with this problem. Suppose that a market research company finds that at a price of p = $20, they would sell x = 42 tiles each month. If they lower the price to p = $10, then more people ...

### Math

Ok I'm on castle learning and for homework this weekend we have to do #1-4 (assignments) that is due on Saturday @ midnight because that the time it will close and I need help on this question. My assignment is: Math 7 (Q1) Assign #2 - Fractions (i already did the others) Qs. ...

### chemistry

Predict if a precipitate will form when 20.00 mL of the 50% saturated solution is mixed with 20.00 mL of 0.0100M of the following solutions.? the saturated solution is : BaCO3, it has the Ksp of 5.1 x 10^-9 the solubility is 7.1 x 10^-5 M. I don't know how to do this. I am ...

### Chemistry

CaO(s) reacts with SO2(g) according to the following equations: CaO9(s)+So2(g)--> CaSO3(g). A 8.85g mixture containing CaO(s) is placed in a 3.00-L container. The container is filled with SO2(g) to a pressure of 749 torr, at 20.0 degree Celsius. After the reaction has gone ...

### Chemistry

Consider the burning of LPG (propane C3H8)which produces carbon dioxide (CO2) and water vapor (H2O). The balanced chemical equation involving the reaction is C3H8+5O2= 3CO2+4H2O Suppose 1.5 moles of C3H8 will be used, assume the following: a. How many moles of O2 will be ...

### chemistry

CaO(s) reacts with SO2(g) according to the following equations: CaO9(s)+So2(g)--> CaSO3(g). A 8.85g mixture containing CaO(s) is placed in a 3.00-L container. The container is filled with SO2(g) to a pressure of 749 torr, at 20.0 degree Celsius. After the reaction has gone ...

### chem

The experiment described in the procedure was performed using a sample of Calcium with HCl(aq). The lab conditions were 25.00°C, and 747.0 torr barometric pressure. 112.7 mg of Calcium (MM: 40.08 g/mol) was reacted with 25.00 mL of 1.25M HCl(aq). 71.560g of water was ...

### Chemistry-Plz see this DrBob

I am sorry I do not know what happens the symbolism, so I just deleted the symbols. Is it works for you that deleted the symbols? Using standard reduction potentials, calculate the standard Ecell, emf, for each of the following reactions. State if each reaction is spontaneous ...

### Chemistry

I'm confused with this question as I don't understand how to write the reactions. Here is the question if you could please help me with this question or just even give me an example on how to do it. I would really appreciate it. Thank you. Write the oxidation and reduction ...

### chemistry

Hi, I was hoping someone could double check a chemistry answer for me. I am trying to calculate the Ksp of Ag2CrO4. This question is based on a experiment to determine ksp experimentally. In the experiment the Ksp of silver chromate was calculated using a single displacement ...

### Math

A landscape architect is designing a new park for the city.His design must include the following types of figures. Exactly 4 boundary segments Exactly 1 pair of boundary segments must be parallel The intersection of at least two of the boundary segments must form an obtuse ...

### eth- please revise

Should United States government policy favor certain kinds of immigrants. Immigration policy in the United States deals with people that are entering the country; especially, those who plan to work and remain illegally. In essence, when it comes to the issue of immigration, it...

### chem--please help me check my answer!!

write an ionic and net ionic equation for the following reaction between Fe3+ and NH4OH. Please check my answer!! Thank you. My answer is: ionic: Fe3+(aq) + NH4OH--> Fe(OH)3 + NH4+ net ionic: Fe3+ +OH- -->Fe(OH)3

### science

Will you please check? Physical or chemical properties 1. bitter taste = physical taste 2. can neutralize a base= physical property 3. boiling point = physical property 4. reacts with a base to form water= physical 5. reacts with acid to form hydrogen = chemical property 6. ...

### Mathematics

(in this question they did not give me any diagrams) use pie 22/7 (a) a piece of wire is bent to form a square of area 121cm squared Calculate the length of each side of the square. Calculate the perimeter of the square. (b) the same piece of wire was bent to form a circle. ...

### math

Three forces act on a hockey pick as it slides across the ice; the normal force N represents the force the ice exerts upward on the puck and is given by N= <0,0,100>, the gravitational force G represents the downward force of gravity on the puck and is given by G = <0...

### Downloading" repost

Hi, I need some help downloading two PDF files. They are for volunteer work at Roswell Cancer Institute. I believe there is a brochure and an application form: 19433 Volunteer Application Form - single pages.pdf 68K View as HTML Download Volunteer Brochure.pdf 226K View as ...

### Math

I have the following chart that I am supposed to find the percent increase in one step, not using a two step method. 10.5 12.5 14.9 17.7 21.1 25.1 When I do this (and round) I get about 19% increase for each one. (we are supposed to round. Then I have another chart that we are...

### Business presentation

Imagine you have been asked to make FOUR presentations on "Effective Presentation Skills" for FOUR very different audiences. What would be your presentation objective for each group? Write a 1-sentence objective statement (also known as "purpose statement") for each of the ...

### chem

Ammonium carbonate (solid) decomposes when heated to produce three gaseous products - ammonia, water, and carbon dioxide. 1. Write the balanced equation for the reaction. 2. Suppose that ammonium carbonate is heated to 500 K in a sealed vessel. At equilibrium there is still ...

### math(check answers please)

please check my math answers again thanks. by the age of 27,justin had visited 25 out of the 50 states.what fraction of the states had justin visited?write the answer in simplest form. A.2/1 B.25/50 C.1/2(I PICKED THIS) D.1/3 Heather drove 10 miles in 22 minutes.which is the ...

### 9th Grade Biology

You set up 5 samples that contained a range of sucrase concentrations but the same amount of substrate (sucrose). - The pH was kept constant in all tubes buy using the same amount of buffer. - The temperature was kept constant in all tubes (room temp) - A negative control was ...

### Physics

A orbiting satellite stays over a certain spot on the equator of (rotating) Mercury. What is the altitude of the orbit (called a "synchronous orbit")?

### Physics

A orbiting satellite stays over a certain spot on the equator of (rotating) Mercury. What is the altitude of the orbit (called a "synchronous orbit")?

### physics

A orbiting satellite stays over a certain spot on the equator of (rotating) Pluto. What is the altitude of the orbit (called a "synchronous orbit")? km

### physics

The mass of a certain neutron star is 2.0 x 1030 kg and its radius is 6,000 m (6 km). What is the acceleration of gravity at the surface of this condensed, burned out star?

### math

A certain strain of virus grows in numbers at the rate of 50% per hour. If its present population is 49,000 what will be its population count in 4 hours?

### algebra

The length of a certain rectangle is 4 m greater than five times it's width. What are the dimensions of the rectangle if its perimeter is 20m??? please help i have no idea how to do this!

### physics

A certain spring stretches 4.6 cm when it supports a mass of 0.55 kg . If the elastic limit is not reached, how far will it stretch when it supports amass of 8 kg ? Answer in units of cm

### Physics

A rock thrown with an initial velocity of 35 m/s at an angle of 48° with respect to the horizontal has a range of 963 m on a certain planet. What is the acceleration of gravity on this planet?

### calculus

Your manufacturing costs are C(x)= -.0001x2+25x+1200 and the demand for X units of a certain commodity is p(x) =55 – x/1000. What is your maximum revenue and maximum profit?

### physics

A certain capacitor stores 473 J of energy when it holds 7.91 x 10−2 C of charge. What is the capacitance of this capacitor? What is the potential difference across the plates?

### Physics

A certain capacitor stores 473 J of energy when it holds 7.91 x 10−2 C of charge. What is the capacitance of this capacitor? What is the potential difference across the plates?

### algebra

A certain disease affects 9 out of every 10,000 Americans. In a city of 4.5 milion people, how many would you expect to have the disease.

### match

A certain land area is 340,000 square miles, and it holds a population of 63.1 million people.Calculate the population density.

### math

A certain amount earns 10percent interest compounded annually .What is the minimum number of years(in integers) it takes to double the amount ??

### math

. A certain amount earns 10percent interest compounded annually .What is the minimum number of years(in integers) it takes to double the amount ??

### Statistics

According to insurance records a car with a certain protection system will be recovered 89% of the time. Find the probability that 3 of 7 stolen cars will be recovered.