a certain reaction has the following generaln form

72,211 results, page 87

statistics

Scores on a certain nationwide college entrance examination follow a normal distribution with a mean of 400 and a standard deviation of 100. Find the probability that a student will score over 500.

Physics

a ball is released from rest and rolls down in an inclined plane, requiring 4 sec. to cover a certain distance of 100m. a) what is the acceleration? b) how many cm would it have fallen vertically in the same time?

english

Type a short character sketch of a fictional Puritan named Justice Johnson based on what you have learned about the Puritans Make certain that you describe how he dresses how he lives what he believe?

Chemistry

The electrolysis of a water solution of H2SO4 produces, after a certain period of time, 20L of H2, (T=25° and P=1); calculate the amount of Coulomb necessary for the hydrogen production and the moles of molecular oxygen developed.

child care mangement

children create _ when they talk about certain kinds of information many times. a. cultural schemes b. socialization strategies c. motivations d. attitudes I think its b please check my answer

physics

At a certain undisclosed place (probably not on Earth) an Atwood's like experiment gives the graph of 1/t2 vs Δm the slope is 3.8 (in 1/(kg s2). One also knows that h=1.3m, total mass =0.8kg and I/r2 = 0.08kg. what is the gravitational acceleration is (in m/s2)?

Theories and issues in working with school-age chi

Children create _______ when they talk about certain kinds of information many times. A. motivations B. cultural schemas C. attitudes D. socialization strategies D.

Theories and issues in working with school-age chi

 Children create _______ when they talk about certain kinds of information many times. A. motivations B. cultural schemas C. attitudes D. socialization strategies A.

probability and statistics

a certain university in the region has a population of 20000 students distributed into 15 courses and four year levels.if you would like to determine the sample size, what technique can be applied

Math

It is raining outside when the temperature quickly drops below freezing and stays that way for several hours. What is the likelihood that the water on the ground will turn to ice. A. Certain B. Likely C. Unlikely D. Impossible

Psycholofgy

Please help me! I have been on this one question for some hours now and still don't if this is the correct answer. I choose A Social influence ranges in intensity from the gentlest form _______, which involves changing one's behavior just because other people are nearby, to ...

Math

When 18 is subtracted from four times a certain number, the result is 5/2 the original number. What is the number?

MATHEMATICS

TWICE A CERTAIN NUMBER IS SUBTRACTED FROM 9 TIME THE NUMBER.THE RESULT IS 21.FIND THE NUMBER.

Chemistry

If air is 20% oxygen, and the reaction is 2C2H2 + 5O2 --> 4CO2 + 2H2O, What volume of oxygen would be needed to completely burn 1.00 L of acetylene (C2H2)? I got 2.50 L but I'm not sure it's right. What volume of air would be needed to completely burn 1.00 L of acetylene ...

math,word problem

Twice the square of a certain whole number added to 3 times the number makes 90.Find the number.

math

A certain infinite geometric series has first term 7 and sum 4. What is the result when the third term is divided by the second term?

Help math

The length of a certain rectangle is quadrupled and the width is tripled. What is the ratio of the area of the new enlarged rectangle to the original rectangle?

Algebra

The cost of purchasing x meter lengths of a certain rope is: C=1/5x^2-8x+100 per rope. What is the length of the cheapest rope that can be purchased?

Math

A certain infinite geometric series has first term 7 and sum 4. What is the result when the third term is divided by the second term?

Chemistry

CaCO3(s) <--> CaO(s) + CO2 (g) A 5.9-gram sample of CaCO3 (molar mass = 100.) is placed in an evacuated 2.00L container and heated to 200^oC. Equilibrium is reached when 5.15% of the CaCO3 has decomposed. 1)Write the Kp expression for this reaction and calculate its ...

Chemistry

Water is added to 4.267 grams of UF6. The only products are 3.730 grams of a solid containing only uranium, oxygen and fluorine and 0.970 gram of gas. The gas is 95.0% flourine, and the remainder is hydrogen. From data determine the empirical formula of the gas. What fraction ...

chemistry

Water is added to 4.267 grams of UF6. The only products are 3.730 grams of a solid containing only uranium, oxygen and fluorine and 0.970 gram of gas. The gas is 95.0% flourine, and the remainder is hydrogen. From data determine the empirical formula of the gas. What fraction ...

Solar Energy - Engineering

In the process of electrolysis, electrical power is used to separate water into oxygen and hydrogen molecules via the reaction: H2O --> H2 + ½O2 This is very much like running a hydrogen fuel cell in reverse. We assume that only the activation potential for the hydrogen ...

English

1. He spent much money on clothes. 2. He spent too much money in buying books. 3. He spends lots of money traveling to many countries. 4. He spends plenty of time watching TV. 5. He spent a lot of time in buying items in the department store. Are all grammatical? Do we have to...

Math-check my work please??

Write an equation, in point-slope form, for the line that is perpendicular to y – 10 = 3/2 (x – 4) and that passes through the point (4, 2). My Answer: Formula for point-slope form; y – y = m(x – x) Insert y and x value; y – 2 = m(x – 4) If the slope for the ...

finance

Bristol Sales had the following transactions for DVD’s in 2012, its first year of operations. Jan. 20 Purchased 75 units @ $17 = $1,275 Apr. 21 Purchased 450 units @ $19 = $8,550 July 25 Purchased 200 units @ $23 = $4,600 Sept. 19 Purchased 100 units @ $29 = $2,900 During ...

science

describe the reaction of photosynthesis.

Chem

NaOH (aq) + Zn (solid) reaction

chemistry

when will a displacement reaction not occur?

science

what is an example of a chemical reaction.

CHEMISTRY

What is reaction between HI+HNO3

Chemistry

38. Identify the type of reaction. A + B --> AB A + BC --> AC + B Thanks -MC

chemistry

Is there a reaction? 2 NaNO3 + ht →

chemistry

write the reaction for Zn + HCl

Chemistry 12

Is O2(g) <---> O2(aq) an endothermic/exothermic reaction, and why?

Chemistry

Zn + I2 ---> Zn ^+2 + 2I- will this reaction occur spontaneously?

chemistry

what type of reaction is Al+S8=Al2S3

reaction

conversion of cyclopropane to propene

science

iron and sulphur reaction

maths

what is the equllibrium constant of KI + I2 reaction at 35 c?

chem

combination reaction. mg2+o2

chemistry

The nuclear reaction Sn ¨ Sb + ? is an example of

thermodynamics

H° = 565 kJ and S° = -11.1 J/K Calculate G° at 25°C for this reaction.

Chemistry

Balance the redox reaction: Ag(aq)+Cu(s)= Ag(s)+Cu(aq)

GCC

PREDICT THE REACTION MG(NO3)2(AQ)+NA(S)

Chemistry

Is esterification a condensation reaction?

Chemistry

Is esterification a condensation reaction?

chemistry

Why is respiration an exothermic reaction?

Chemistry

Is photosynthesis a reversible reaction?

Chemistry

Is fermentation an irreversible reaction?

Science

Is photosynthesis a endothermic reaction

Chemistry

What is the reaction of dilute HCl with Zn?

Science

Reaction time.experiment

history

A democracy may be defined by the political principle that the government is created by, derives its powers from, and exists to serve the people. According to this statement, which of the following is inconsistent with a democratic form or government? 1)the citizens of a ...

English

1. We decided to go abroad. 2. We made up our mind to go abroad. 3. We made a decision to go abroad. 4. We made up our minds to go abroad. (Are they all interchangable? Do we have to use the plural form 'minds' or the singular form 'mind'?) 5. We determinded to go abroad. 6. ...

Repost- Biology

Will someone please help me out.. I have been posted these questions for 7 hours .. but no one has helped me out..please help me out..I got to figure it out within today..please.. 1. Which of the following is a biotic factor that might affect the life of a water-dwelling ...

physics

4 kg block rests on a smooth horizontal surface,upper surface of 4 kg is rough.A block of mass 2 kg is placed on its upper surface.The acceleration of upper block with respect to earth when 4 kg mass is pulled by a horizontal force of 30N?coefficient of static friction=0.8 and...

math

the only perfect number of the form (x to the power of n) + (y to the power of n) Perfect numbers have the form 2k−1(2k − 1) The first few perfect number are 6,28,496 and 8,128. Does n have to be something other than 1 in your question? I can see 28 = 13 + 33 but I...

Chemistry

How does the 3D structure of SP3 bonds of Carbon, Oxygen and Nitrogen cause them to form polar molecules? How does the three dimensional structure of SP3 bonds of Carbon, Oxygen and Nitrogen cause them to form polar or non-polar molecules? The answer must include a 3d diagram ...

Calculus

I need help with the following problem: You're in a hot air balloon with your support crew on the ground. Attached to the balloon are two tether cords of length 350 feet and 400 feet that your crew attached to the ground. These cords form an angle of 50 degrees where they meet...

English

4. In "The New Colossus," the Statue of Liberty is compared to alan A. European queen. B. mother. C. immigrant D. door 7. Describing the chariot that bears the human soul as "frugal" is an example of A. paradox. B. denotation. C. epiphany. D. realism 9. Who is the speaker in ...

Geography

What is urban exclusion? I think it is the spatial restrictions imposed on certain societal groups as a result of urban expansion/development by the better off people. Am I close?

Chem

A flask weighs 95 g when empty. When filled with 200 mL of a certain liquid, the weight is 328 g. What volume (in milliliters) would 1,000 g of the liquid occupy? I am confused on set up I know d=m/v so v=m/d

Algebra

How long will it take for the population of a certain country to double if its annual growth rate is 1.5%? Round to the nearest year. Use the exponential growth model P(t) = P0e^kt

Physics-Gravity

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")? Do I use T^2=4pi^2/GM x r^3?

9th grade

At a certain time, a vertical pole 3 meters tall casts a 4 meter shadow. What is the angle of elevation of the sun? Round your answer to the nearest meter

science

A total solar eclipse means that no sunlight reaches a certain area on earth. true false Just need to know if my answer or right or wrong. Thanks! :) true

science

A total solar eclipse means that no sunlight reaches a certain area on earth. true false Just need to know if my answer or right or wrong. Thanks! :) false

Pre Calc

A certain key is cut for a lock with six tumblers, each of which has five depths and no two consecutive tumblers can be the same depth. How many different keys can be made?

Math/Trig

If the population of rabbits in a certain area is modeled by the function, r=10,000cos(pi/12t)+35,000 where t is the time in months, approximately how many rabbits will there be in August (January is equal to t = 1)?

physical science

A projectile is launched upward at an angle of 75 from the horizontal and strikes the ground a certain distance away. For what other angle would it have the same range?

Chem8

The decomposition of XY is second-order in XY and has a rate constant of 0.00895 M-1s-1 at a certain temperature. If the initial concentration of XY is 0.194 M, how long (in seconds) will it take for the concentration to decrease to 0.047 M?

Chem10

The decomposition of XY is second-order in XY and has a rate constant of 0.00599 M-1s-1 at a certain temperature. If the initial concentration of XY is 0.174 M, how long (in seconds) will it take for the concentration to decrease to 0.054 M?

physics

7. Imagine that the coefficient of kinetic friction between a certain 15-kg box and the floor is 0.35. How hard would you have to push on it to move it at a constant speed of 2.6 m/s across the floor?

chem 101

it takes a certain gas 1.98 times as long to diffuse as an equal volume of helium under the same conditions. what is the calculated molecular weight of the gas?

English

Thank you. The exercise is not complete but aims at revising the use of the infinitive (with or without to) and the gerund after certain verbs. She didn’t dare to speak/speak (both possible?) to him about that.

science

How do I find oxidation numbers of certain elements in compounds? I'm really confused so very simple terms would be appreciated. EX: What is the oxidation number of sodium in NaOH???

physics

A brick of mass 0,5 kg possesses 100J of gravitational potential energy when held at a certain height above the ground.How long will it take to reach the ground when it is released?

English

Is this a complete sentence? Or should the comma be replaced by a semi-colon? Surely there are certain situations in which appropriate attire is necessary, so should we as women give in to that standard?

math

All varieties of a certain brand of cookies are $3.50 A person buys peanut butter and chocolate chip cookies. Write an expression that tepresents the total cost.

math

All varieties of a certain brand of cookies are $3.50 A person buys peanut butter and chocolate chip cookies. Write an expression that tepresents the total cost.

College math

Please HELP! In a certain lottery game players choose a set of 6 distinct numbers from the numbers 1-50. How many combinations are possible if order is not important. Thanks sooooo much!

Statistics

The lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed with mean 43 and standard deviation 7. Find the percentile corresponding to p = 29% of the tire lifetimes.

Math

A certain car costs $11,595 before taxes are added. Taxes are $860 and license tags cost $95. What is the overall tax rate (to the nearest tenth)? %

college chemistry

A certain metal crystallizes in a face-centered cubic arrangement and has a density of a density and atomic radius of 12.41 g/cm3 and 134.5 pm, respectively. Which element below is it?

Integral calculus

It requires 8 inch pounds of work to stretch a certain spring 2 inches from its rest position. Assuming that the spring follows hooke's law, what is k? Thanks for your answers! :)

math

A certain car costs $6,595 before taxes are added. Taxes are $460 and license tags cost $55. What is the overall tax rate (to the nearest tenth)?

Algebra

A pollster randomly selects 100 people from each town in a certain candidate’s district to see if they support the candidate. Why might this survey not produce a good sample?

Algebra/can you ck my answer

Last semester a certain professor gave 24 A's out of 237 grades. What is the probability that student received an A. round two decimal. I came up with 24/237 = .010 thank you

Physics

The makers of a certain automobile advertise that it will accelerate from 15 to 50 mi/hr in high in 13 sec. Compute (a) the acceleration in ft/ sec2, and (b) the distance the car travels in this time, assuming the acceleration to be constant.

maths

there were 13426 eligible voters for a certain election one election day 8206 people cast their vote what wase the percent of voter turn out

Physics

Suppose that a cars x-acceleration during a certain time period is given by the function a(t) = -bt. If the cars x-velocity at t=0 is 32m/s, and b=1m/s^2, how long will it take the car to come to rest.

Physics

two charges of 40 microc and -20 micro c are placed at a certain distance apart. they are touched and kept at the same distance.the ratio of their initial to the final force between them is

Chemistry

A given volume of ozone diffused from a certain apparatus in 96seconds calculate the time taken by an equal volume of carbonoxide to diffuse under the same condition?

English

1. Colors make up our world. 2. Our world is made up by colors. 3. Our world is made up of colors. (What is the passive form of the active form #1? Is it #2 or #3? Are both grammatical?) 4. Is two-word verb composed of a verb and an adverb? What about a verb and a preposition...

Science

Ions are electrically charged particles that are formed when certain compounds are dissolved in water. These solutions will conduct electricity. The Swedish scientist Svante Arrhenius coined the term ion (which means wanderer) to explain why solutions of electrolytes will ...

Science

Ions are electrically charged particles that are formed when certain compounds are dissolved in water. These solutions will conduct electricity. The Swedish scientist Svante Arrhenius coined the term ion (which means wanderer) to explain why solutions of electrolytes will ...

science

Ions are electrically charged particles that are formed when certain compounds are dissolved in water. These solutions will conduct electricity. The Swedish scientist Svante Arrhenius coined the term ion (which means wanderer) to explain why solutions of electrolytes will ...

math

find the sum of 2 1/2 and 2/5 which of the following makes the statement true? 1/5^0 the area of a certain state is 840,000 square miles. what is this area in scientific notation? which is irrational? A. 0.11711711711... B. o.8596873205... C. 0.812812812812... D. 0....

computer science

I have a horrible TA as a professor with a bad Indian accent that I cant understand and I am very confused with what we are doing. Encrypt the following byte message into its Cipher and again decrypt it into original form based on RSA public key cryptosystem. Message: 0001 ...

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