# a certain reaction has the following generaln form

72,211 results, page 92

### science

2Zn+O2=2ZnO. What type of chemical reaction is it

### chemistry

1. A student wanted to measure the amounts of (Ca2+) in the human blood. She got 1.00ml which she treated with Na2C2O4 solution. The resulting Ca2C2O4 precipitate was filtered and dissolved in dilute H2SO4 to release C2O42- into solution and allow it to be oxidized. The ...

### Chemistry

I did a lab for Organic Chemistry I did a simple distillation for an unknown and found that it boiled at 76 degrees. I also found out that the unknown was ethanol since we knew what the 4 possibilities were and mine was closest to ethanol. I also did a fractional distillation ...

### Calclulus - L'Hopital's Rule

Evaluate the limit as x -> Infinity [5x-sqrt(25x^2+4x)] Direct substitution yields the indeterminate form Infinity - Infinity. Apparently, according to text book, I have to change that mess into something I can use L'Hopital's Rule on. Except the only example the book gives...

### Science

1.The images above show particles in a medium. Which of the following shows the worst conditions for a sound wave to travel? A B C D 2.Which of the following correctly describes a radio wave? A.long wavelength and high frequency B.long wavelength and low frequency C.short ...

### Chemistry

When solid magnesium nitride reacts with water the reaction produces solid magnesium hydroxide and ammonia gas. If 22.9 grams of magnesium nitride are added to 31.0 grams of water, how many liters of ammonia should be produced (assuming standard temperature and pressure)? ...

### Math 2

You should make two selections from the list below. Which two of the four equations represents parallel lines? 2x - 3y = -10 6x - 9y = 15 3x + 2y = 10 9x + 6y = 30 i think it's the second one Parallel lines have the same slope. Rework your equations to be in the form y=mx + b ...

### English

I don't exactly know if my answers are correct, but can you please check? 1.) Which of the following could you reveal? A.) your age B.) your date of birth C.) your thoughts D.) your plans for the future I think it's a,b,c, and d. 2.)which of the following would have an impact...

### english

Axia College Material Appendix B Sentence Structure Review Each of the following sentences has one grammatical error. The errors are in one of the following four categories: subject–verb agreement, run-on sentence, verb form and tense, or sentence fragment. Identify which of...

### English

How can a certain narrative show originality? I have to write an essay about how the story we read in class narrative shows originality...

### Maths

A certain number is halved, then increased by 3. The result lies between 5 and 7. Between which two values does the number lie? Write an inequeality for this?

### Physics

A certain spring stretches 5.3 cm when it supports a mass of 0.65 kg . If the elastic limit is not reached, how far will it stretch when it supports a mass of 10 kg ?Answer in units of cm

### Physics

When certain a force is applied to a 2kg standard mass, its acceleration is 5m/s^2.When the same force is applied to another object its aceleration is 2m/s^2. The mas of the objects is:

### geography

Why are lines of latitude and longitude important? My answer--- They are important because they help you locate exactly where a certain location is. Do you think this is the answer my teacher is looking for?

### chemistry

A certain substance has a molar heat of vaporization of 54.2 kJ/mol. How much of the substance is in a sample that requires 80.0 kJ to vaporize? Answer in units of mol

### chemistry

a certain radioactive nuclide has a half life of 5.00 hour. Calcuate the decay rate for 1.000 mole of this nuclide __________ decay s-1

### accounting

If the cost of, C(x), for manufacturing x units of a certain product is given by C(x)=x2-70x+4400, find the number of units manufactured at a cost of $7400?

### physics

A certain car is capable of accelerating at a rate of 0.57 m/s^2.How long does it take for this car to go from a speed of 56 mi/h to a speed of 66 mi/h? 1mi/h = 0.447 m/s.Answer in units of s

### physica

If a certain spring stretches 4.32221 cm when a load of 15.3617 N is suspended from it, how much will the spring stretch if it is cut in half and 18.2451 N is suspended from it?

### math

At a certain grocery store, "a" customers each spend an average of $30 every "b" hours. How much revenue , in dollars, does the store collect in "c" hours?

### math

answer if its going to be impossible, unlikely,likely,as not likely or certain 1. rolling an even number on a number cube labeled 1 through 8

### Physics

A certain automobile engine delivers 2.24 ✕ 10^4 W (30.0 hp) to its wheels when moving at a constant speed of 31.0 m/s ( 69 mi/h). What is the resistive force acting on the automobile at that speed?

### physics

A 22-N force, parallel to the incline, is required to push a certain crate at a velocity of 6.1 up a frictionless incline that is 55° above the horizontal. The mass of the crate is:

### physics

A 36-N force, parallel to the incline, is required to push a certain crate at a velocity of 9.1 up a frictionless incline that is 45° above the horizontal. The mass of the crate is:

### Science

1 mole of chlorine combines with a certain weight of a metal giving 111g of its chloride. The atomic weight of the metal (assuming its valency to be 2) is-

### basic algebra

the tens digit of a certain number is 4 more than the units digit. the sum of the squares of the two digits is 26. find the number.

### Physics

A certain spring stretches 6 cm when a load of 30 N is suspended from it. How much will the spring stretch if 50 N is suspended from it (and it doesn't rsach its elastic limit)? I don't understand what to do for this problem.

### math

The difference between compound interest and simple interest on a certain amount for1.5 yes at 12% per annum is ₹ 150.calculate the amount.

### stats

The probability is 0.7 that a person shopping at a certain store will spend less than $20. For groups of size 13, find the mean number who spend less than $20.

### Chemistry

A stp a certain mass of gas occupies a volume of 790cm3, find the temperature at which the gas occupies 1000cm3 and has a pressure of 726mmhg

### Algebra

Glen created a mural on a rectangular sheet of paper with a width of √18 feet and a length of √24. A. Find the exact area of the mural, in simplified form. When Glen’s mural was unveiled, the school made a smaller version of the mural to advertise the event. The ...

### Chem

If the initial pressure of HD(g) is 8.913 atm, calculate the % decomposition of HD(g) when the reaction comes to equilibrium according to the balanced equation. The value of Kp at 1000 K is 0.26. The initial pressure of the reaction products is 0 atm. 2HD(g) = H2(g)+D2(g) So I...

### Physics

A certain type of ideal gas at pressure p0 is contained in a plugged flask of volume V initially at temperature T1. The environmental pressure remains constant p0. (A) As the flask is heated up to temperature T2, the plug pops out. What is the pressure p2 of the ideal gas ...

### Science/CHEM

Part 1 Chapt 4 1. You dissolve 157.1 g of ammonium nitrate in a 250 mL volumetric flask and add water to the mark (call this solution A). You take 30 mL of solution A and place it in a 100 mL volumetric flask and add water to the mark (this is solution B). Next you take 50 mL ...

### CHEM

1. How many moles of water can be made from 4 moles of oxygen gas and 16 moles of hydrogen gas? What is the limiting reagent? 2. Calculate the mass of water produced from the reaction of 24.0 g of H2 and 160.0 g of O2. What is the limiting reagent? 3. The burning of 18.0 g of ...

### Biology

The diversity of chemical reation occuring in a cell depends mostly on certain molecules present in the cells are called? It's one of these proteins, coenzymes, or enzymes. i believe it is enzymes, but i could be wrong. correct

### math

The minimum daily values (MDVs) for certain foods are given. They are based on a 2000 calorie per day diet. Find decimal and fractional notation for the percent notation on each sentence. a)

### math

The minimum daily values (MDVs) for certain foods are given. They are based on a 2,000 calorie per day diet. Find decimal and fractional notation for the percent notation in each sentence.

### math

The minimum daily values (MDVs) for certain foods are given. They are based on a 2,000 calorie per day diet. Find decimal and fractional notation for the percent notation in each sentence.

### Spanish

Not really a homework question, but more of asking for advice... I'm doing a skit tomorrow with another classmate in spanish and we had to write and memorize(sort of) lines according to a certain scenario. Are there any good techniques to help with my performance?

### child psycology

We see indications that a child's role in perceptual development is passive when we observe? A. irrelevent information made relvant. B. selective attention. C. a preference for certain stimuli. D. systematic search.

### Calculus

I am supposed to find when there will be 40 berry bushes. I am given the function p(t)=(16t+50t^3)^1/3. P is the population of a certain type of bush in a conservation area and t is time in years. I know that i am supposed to make p(t) = 40, but i don't know how to solve for t...

### Physics

A car is traveling counterclockwise along a circular bend in the road with an effective radius of 200 m. At a certain instant, the carâ€™s speed is 20 m/s, but it is slowing down at a rate of 1.0 m/s^2. What is the magnitude of the carâ€™s acceleration?

### electrical

6.A resistor R1 dissipates power P when connected to a certain generator with voltage V. If a resistance R2 is put in series with R1 the power dissipation by R1 A) Decreases B) Increases C) Remains the same D) Any of the above depending upon the value of R1 and R2

### math

If the hourly sales at a certain register in a supermarket are normally distributed with a mean of $650 and a standard deviation of $60, find the probability that the sales during a randomly selected hour are greater than $800.

### Word Problem

In a certain individual the resting diastolic pressure at time t is given by B(t)= 80+7sin((pi)(t)/(12)) where t is measured in hours since midnight and B(t) in mmHg (millimeters of mercury). Find this person's pressure at 6:00 am, 10:30 am, noon, and 8:00 pm.

### College Algebra

The concentration C of a certain drug in a patient's bloodstream t minutes after injection is given by C(t)=50t/t^2+25. Determine the time at which the concentration is highest. Round your answer to the nearest tenth of a minute.

### calc

find the volume of the solid generated by revolving around the x-axis: y=e^(x-8), y=0, x=0, x=10 So I know you can use the washer method, but the shell method can also be used and it should be better. The issue is I'm not certain how to actually do it. Any help is appreciated!

### Sociology

This is the reason an employer might restrict employee internet access? a. Employees waste too much time on the internet b. viewing certain kinds of sites could lead to a hostile work environment

### physics

i know this is stupid most likely but i missed a few weeks of lecture bc i was in hospital and i caught up on most of the notes but certain parts have me confuse, does anyone know how to tell if an electric force is negative or positive?

### calcullus

Suppose the quantity demanded per week of a certain dress is related to price by the demand equation p=√75-2x. In order to maximize revenue, how many dresses should be made and sold each week?

### Math

Suppose the quantity demanded per week of a certain dress is related to price by the demand equation p=√75-2x. In order to maximize revenue, how many dresses should be made and sold each week?

### 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? Please answer this question. Thanks for your answers in advance.

### Math - Variation

under certain conditions, the thrust T of a propeller varies jointly as the fourth power of it's diameter, d, and the square of the number, n, of revolutions per second. What happens to the thrust if n is doubled and d is halved?

### SCIENCE

A SCIENTIST NOTED A POSSIBLE RELATIONSHIP BETWEEN A CERTAIN CHEMICAL SUBSTANCE FOUND IN FISH AND THE OCCURRENCE OF THE KIDNEY FAILURE IN HUMANS. WHICH STEPS SHOULD THE SCIENTIST BEFORE CONDUCTING EXPERIMENT.

### homework

The number of bacteria in a certain population increases according to a continuous exponential growth model, with a growth rate parameter of 3.9% per hour. How many hours does it take for the size of the sample to double?

### math

A certain medicine requires 10 mg per 10 kg of weight. How much medicine is required for a patient that weighs 273 pounds? Round answer to the nearest 10th. Use Unit Abbreviations for Units.

### Math

A certain medicine requires 10 mg per 40 kg of weight. How much medicine is required for a patient that weighs 203 pounds? Round answer to the nearest 10th. Use Unit Abbreviations for Units

### Statistics

Suppose that on average 10% of the people with an airline-ticket doesn't show up at the flight.For a certain flight, the plane has 100 seats and 110 tickets are sold. What is the probability that everyone who shows up will have a seat?

### Simple geometry question

What do the lines mean that are on certain triangles. for example, a triangle would have a single dash at the bottom, two dashes on one side and three dashes on the other

### Chemistry

---This was the previous one--- Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is yellow, and C is red. In the reactions in which they participate, they are reduced to A-, B-, and C- ions, all of which are colorless. When a solution of C is ...

### Chemistry

How did the metal atoms become ions? Metal atoms became ions by losing electrons to form positively charged ions(cations). How did the nonmetal atoms become ions? Nonmetal atoms became ions by gaining electrons to form negative ions(anions).

### physics

A certain refrigerator is rated as being 39% as efficient as a Carnot refrigerator. To remove 102 J of heat from the interior at 0 °C and eject it to the outside at 23 °C, how much work must the refrigerator motor do?

### physics

A certain refrigerator is rated as being 39% as efficient as a Carnot refrigerator. To remove 102 J of heat from the interior at 0 °C and eject it to the outside at 23 °C, how much work must the refrigerator motor do?

### business math

Statistics show that the sales force of a certain company successfully closed 352 sales out of 800 sales calls. What was their percent success rate?

### Science Computers!

Computers use energy and respond to certain stimuli, such as commands from the user. Why, then, are computers not considered living things? PLZ Answer This Scientifically and Not Obviously.

### Math

Emma started with a certain amount of money. She spent 2/5 of her money. She earned €5 the next day. Later, she lost 3/7 of her money, but she still had €20 left. How much did she start with?

### Math

How do I Write the equation to find the slope of a line? Write the point-slope form of the equation of a line? Write the slope-intercept form of the equation of a line?

### chemistry

Asprin, C9H8O4, is prepared by reacting salicylic acid, C7H6O3, with acetic anhydride, C4H6O3, in the reaction C7H6O3(s) + C4H6O3(l) -> C9H8O4(s) + C2H4O2(l) A student is told to prepare 45.0 g of aspirin. She is also told to use a 55.0% excess of the acetic anhydride and ...

### Chemistry: Please check my work!I am stumped

When nitroglycerin (C3H5N3O9) explodes, it decomposes into the following gases: CO2, N2, NO, and H2O. If 239g of nitroglycerin explodes, what volume will the mixture of gaseous produces occupy at 1.00 atm pressure and 2678oC? a. Write a balanced equation for the reaction. b. ...

### Chemistry

EQUILIBRIUM: To prepare the standard solution, a very large concentration of ferric ion is added to a small initial concentration of thiocyanate ion. True or False It would help if we knew what you were doing. We are determining Chemical Equilibrium: Finding a Constant Kc... ...

### Chemistry

Question : ka1 and ka2 values of H2X is given 1*(10)^-5 M and 1*(10)^-9 M.50cm^3 of 0.2 M KOH and 50 cm^3 of H2X of unknown concentration is mixed together and the pH of the final solution is given as 7. 1)Find the concentration of H2X 2)Find the pH of the initial H2X solution...

### chemistry

Question : ka1 and ka2 values of H2X is given 1*(10)^-5 M and 1*(10)^-9 M.50cm^3 of 0.2 M KOH and 50 cm^3 of H2X of unknown concentration is mixed together and the pH of the final solution is given as 7. 1)Find the concentration of H2X 2)Find the pH of the initial H2X solution...

### Batteries - Engineering

Here we consider instead dissolving guns (which we will assume are pure iron) with sulfuric acid. Fe+H2SO4->FeSO4+H2 It is apparent that they must use an outside source of electrical power to drive the dissolution of the iron. They use a small current so that the ...

### English!

While a heroic epic focuses on the expolits of a single hero, an epic is a long poem that : A: focuses on the exploits of a heroine B: tells tales only about gods and goddesses C: explains how certain events and objects in nature came to be D: describe the way of life of an ...

### algebra 1b

i need to know how to solve certain problems like this 4x=2y-10 x+2y=5 i need examples of this and shown to me step by step

### physics

A certain car is capable of accelerating at a rate of 0.59 m/s2. How long does it take for this car to go from a speed of 27 mi/h to a speed of 33 mi/h?

### Science

A certain car is capable of accelerating at a rate of + 0.60 m/s^2. How long does it take for this car to go from a speed of 55 mi/h to a speed of 60 mi/h?

### physics

A certain car is capable of accelerating at a rate of +0.90 m/s2. How long does it take for this car to go from a speed of 55 mi/h to a speed of 80 mi/h?

### physics

A certain car is capable of accelerating at a rate of +0.50 m/s2. How long does it take for this car to go from a speed of 45 mi/h to a speed of 85 mi/h?

### physics

A certain car is capable of accelerating at a rate of +0.90 m/s2. How long does it take for this car to go from a speed of 35 mi/h to a speed of 70 mi/h?

### Physics

A certain car is capable of accelerating at a rate of +0.90 m/s2. How long does it take for this car to go from a speed of 50 mi/h to a speed of 65 mi/h?

### science

a cookie a certain mass. explain why the mass would not change if you break the cookie in half.

### physics

A certain car is capable of accelerating at a rate of +0.60 m/s2. How long does it take for this car to go from a speed of 20 mi/h to a speed of 65 mi/h?

### physics

A certain car is capable of accelerating at a rate of + 0.30 m/s2. How long does it take for this car to go from a speed of 55 mi/h to a speed of 80 mi/h?

### physics

A certain car is capable of accelerating at a rate of + 0.80 m/s2. How long does it take for this car to go from a speed of 15 mi/h to a speed of 75 mi/h?

### math

A certain computer can perform 105 calculations per second. How many calculations can it perform in 10 seconds?

### value

The sum of 9 and a certain number is 2 whole number 1 over 4 times the original number. Find the number

### Physics

A brass is 2m long at a certain temperature.what is its length for a temperature rise of 100k if the expansivity of brass is 18×10^6k^1

### Chemistry Lab

So I did a kinetics lab on the rate of reaction of peroxydisulfate ion with iodide ion. Part 1 was the effect of concentration. One of the questions asked is to calculate the amount of thiosulfate consumed in moles. My results for trial 1 were (Times taken for consumption of 1...

### Chemistry

What is the molarity of Cu2+ in a catalyzed reaction using 3 drops of CuSO4 at .03M in 50.0ml, and what is the molarity of Cu2+ using 6 drops? (Consider the extent of dilution of the 0.1 M CuSO4 solution in preparing the 50 mL reaction solution. Estimate 20 drops/mL.) My Work...

### Chemistry

Question : State whether the following are true or false. SO2 gas changes the colour of a KMnO4(aq) solution They have taken this as false and given the following equation: SO2+H2O+2KMnO4-->K2SO4+MnSO4+H2SO4 (not balanced) But why they have taken this as false when Mn2+ ...

### Science(chem)

I have a few questions I need help with! 1. Hydrogen bonding will account for the unusual physical properties of water. TRUE FALSE 2. Air is considered to be a homogeneous mixture that is 79% nitrogen gas, 20% oxygen gas and 1% all the other gases. In this mixture, nitrogen ...

### HELP PLEASE !!

1.How does the glass of a greenhouse model the carbon dioxide and other gases in Earth’s atmosphere? a)The glass absorbs light and releases energy in the form of heat. b) The glass allows light in and traps much of the radiated heat. c) Plants in a greenhouse absorb energy ...

### algebra[please check]

in questions 1 and 2, write an equation of the line in slope-intercept form. 1. the slope is -4/3; the y-intercept is -2. 2. the slope is 0; the y-intercept is -5. my answers: 1.y=-4/3-2 2. y=-5 ______________________ write an equation of the line that passes through the point...

### English Writing

i have an assignment that i have to email back my friend on identifying minerals. the trouble is how do i write this assignment in "EMAIL FORM" could you helped me please very please...i already finished my assignment now i just have to turn the write up in the form of an ...

### kim

a gaseous hydrocarbon reacts completely with oxygen gas to form carbon dioxide and water vapor. given the following data, determine (delta)HoF for hydrocarbon: (delta)Horxn=-2044.5kj/mol hydrocarbon (delta)HoF CO2= -393.5kj/mol (delta)HoF H2O = -242kj/mol denstity of CO2 and ...

### computers (Check)

Will someone please check my C++ for me? 1. What does the Load ( ) method do? Gets data from a file and puts it into a DataSet object. <----- Gives a value to an attribute of an XmlElement object. Deletes all the data in a DataSet object. Tells a form to appear. 2. Scenario...

### chemistry

*This is part of an exam. so please don't give full solution* just trying to bump ahead of a block. The decomposition of NO2 at room temperature exhibits the following variation in concentration with time: The concentration of NO2 is expressed in mol/liter, while time is ...