# a certain reaction has the following generaln form

72,211 results, page 99

### Science

2Na(s) + 2H2O(aq) = 2NaOH (aq) + H2 (g) Is this reaction exothermic or endothermic? I don't understand ,

### Science

Why is photosynthesis an example of a chemical reaction, and why is it classified as endothermic? Help please

### chemistry (ap)

What will be the reaction rate (formation of C) when the concentrations of A & B are 0.150 M and 0.250 M respectively?

### chemistry

4.8g of Mg were burn in 3.2g of oxygen. The MgO produced at a mass of 8g what is the equation of the reaction

### CHEMISTRY

What will be the reaction rate (formation of C) when the concentrations of A & B are 0.150 M and 0.250 M respectively?

### SCIENCE

CO+H2O ---->CO2+H2 IN THIS REACTION HOW TO I HAVE TO CANAVART CARBONIC ACID?

### chemistry

What is the balanced equation for reaction between hydrochloric acid and water?

### chemistry

What os the balanced equation for the reaction between ethanoic acid and water?

### Physical science

Explain why an endothermic reaction might cause a drop in temperature.

### Chemistry

is H2CO3+2LiOH=Li2CO3+2H2O a oxidation reduction reaction??

### Science

Reaction between potassium dichromate and sulphir dioxide gas?

### Science

Reaction between potassium dichromate and sulphur dioxide gas??

### English

low sleep or sleepiness what is the effect on our reaction time?

### chemistry

When you mix baking soda with vinegar is the reaction endothermic or exothermic?

### Chemistry

Can you check my calculations, please? It's for a lab we did in order to find the the enthalpy of formation of NH4Cl(s). My final answer was -299.4 kJ, while the theoretical, or actual, value is -314.4 kJ. It was the closest value out of everyone in the entire class. I'm not ...

### physics

How do i go about this question? Suppose a car is traveling at 20.0m/s, and the driver sees a traffic light turn red, After 0.530s has elapsed (the reaction time), the driver applies the brakes, and the car accelerates at 7.00m/s2. What is the stopping distance of the car, as ...

### Chemistry Lab

I need help with the third part The chemical method of analysis in determination of the blood alcohol content (%BAC) is: K2Cr2O7 + H2SO4 + C2H5OH → Cr2(SO4)3 + K2SO4 + CH3COOH + H2O What are the stoichiometric coefficients for the reaction above? (please enter the ...

### Accounting

Dividing Partnership Income Desmond Drury and Ty Wilkins have decided to form a partnership. They have agreed that Drury is to invest $140,700 and that Wilkins is to invest $60,300. Drury is to devote full time to the business, and Wilkins is to devote one-half time. The ...

### Please answer two math questions!!!

10. From the 2010 census data, the population of Texas was about 2.5 x 107 people. Florida’s population was about 1.9 x 107. Idaho’s population was about 1.6 x 106. Which of the following statements is true? a)Idaho has a larger population than Florida. b)Florida has a ...

### English

1. Colors make up our world. 2. Our world is made up of colors. 3. Our world is made up by colors. (Is #2 the passive form of #2? What about #3? Is #3 the passive form of #1?)

### intro to lan technologies

• Explain how you would create the users for the sales organization unit and how you can set up work groups in this particular situation. Keep in mind that you may have to name certain applications and allowable tasks for each individual or job role.

### psychology

the legal requirement that professionals notify appropriate authorities about cases in which children and certain other groups of vulnerable individuals are being abused is referred to as a) parens patriae. b)informed consent. c)duty to warm. d)mandated reporting.

### Math 120

The results of a certain medical test are normally distributed with a mean of 128 and a standard deviation of 19. (A score above 140 is considered unhealthy.) Use the given table to find the percentage of people with readings below 137.

### Chemistry

For each of the following, enter the number of covalent bonds that the atom can form: (A) One atom of carbon (B) One atom of sulfur (C) One atom of nitrogen with no net charge (D) One atom of nitrogen with positive net charge (E) One atom of oxygen with no net charge (F) One ...

### Chemistry

Thanks for the help earlier My question Silicon tetrachloride (SiCl4) can be prepared by heating Si in chlorine gas: Si + 2Cl2 yields SiCl4 In one reaction 0.507 mole of SiCl4 is produced. How many moles of molecular chlorine were used in the reaction? Ok is it makeing ...

### correction

One of people’s favorite hobbies is to listen to music. is there another word to say for people. it sounds too informal for an essay. Many people have a hobby of listening to music. The favorite hobby of many people is to listen to music. Listening to music is the favorite ...

### Computer Science (MATLAB)

I had a test in my computer science course in which I was asked if any while loop can be replaced with a for loop. I put true. I guess the answer was false. My professor said that if you had a while loop in which you asked the user to input a certain value that had to be ...

### Computer Science (MATLAB)

I had a test in my computer science course in which I was asked if any while loop can be replaced with a for loop. I put true. I guess the answer was false. My professor said that if you had a while loop in which you asked the user to input a certain value that had to be ...

### Algebra III / Core II

It has been since the beginning of last year since I last did this math and the teacher I currently have is a sub and doesn't know what the heck she's doing either - so if anyone can help me, that'd be oh so amazing! a. Solve d=rt in terms of d and t. b. solve p=4q + 12r for q...

### Math

Calcium is essential to tree growth because it promotes the formation of wood and maintains cell walls. In 1990, the concentration of calcium in precipitation in a certain area was 0.11 milligrams per liter (mg/L). A random sample of 10 precipitation dates in 2007 results in ...

### history

Which of the following best explains why trade among the colonies flourished? A)The different regions specialized in different crops. B)The colonies had developed large fleets of trading ships.** C)Existing trade routes were well-maintained by Native Americans. D)Colonies were...

### Science

When conditions are favorable, certain microorganisms may grow and reproduce in a matter of minutes. True or False? please reply ASAP. True. I believe it depends on the temperature of the surrounding microorganisms.

### Math

The demand and supply equations for a certain item are given by D = -5p + 40 s = -p^2+30p-8 Find the equilibrium price. Wouldn't you set demand equal to supply, and solve for P? I will be happy to critique your work.

### calculus

find all extrema in the interval [0, 2pi] if y=sinx + cosx and also a certain item sells for $30. if the cost of producing this item is given by C=.05^3 + 100, find the mariginal profit when x=10.

### Chemistry

Consider a certain type of nucleus that has a half life of 32 min. Calculate the percent of original sample of nucleus remaining after 3.0 hours have passed? how would i calculate this???

### Chemistry

There was this problem on a test that I took recently. But, I never learned how to solve this. The problem was: it gave the mass of a certain compound and stated that it had 92% carbon. then it asked for the theortical yield of Carbon.

### Math

There are 1760 yards in a mile. A certain wheel makes 17600 revolutions in 40 miles. What is the number of yards in the radius of the wheel?Give the answer as a decimal to the nearest tenth of a yard.

### Physics

For a certain transverse wave, the distance between two successive crests is 3.11 m, and 5 crests pass a given point along the direction of travel every 12.16 s. Calculate the wave speed.

### Physics

For a certain transverse wave, the distance between two successive crests is 1.89 m, and 5 crests pass a given point along the direction of travel every 12.84 s. Calculate the wave speed.

### statistics

Write the null and alternative hypotheses. Justify which is the claim. A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is less than 900 hours

### physical science

a hammer falls off a rooftop and strikes the ground with a certain kinetic energy. if it fell from a roof twice as tall, how would its kinetic energy compare? explain

### Chemistry 2

A saturated solution of a certain metal(II) chloride has a chloride ion concentration of 0.032M. The Ksp for this compound can be determined to be a) 2.6 X 10-7 b) 4.1 X 10-6 c) 1.6 X 10-5 d) 2.6 X 10-4 e) 1.6 X 10-2 I am unsure how to approach this problem or the steps to ...

### calculus

The population of a certain community is increasing at a rate directly proportional to the population at any time t. In the last yr, the population has doubled. How long will it take for the population to triple? Round the answer to the nearest hundredth, if necessary.

### chemistry

A 1.70 g sample of a certain metal reacts with acid to liberate 380 mL of hydrogen gas, when collected over water at 20 Celsius and over 720 torr. What is the equivalent mass of the metal?

### physics

For a certain transverse wave, the distance between two successive maxima is 1.26 m and eight maxima pass a given point along the direction of travel every 12 s. Calculate the wave speed.

### Physics

HELP!!! Consider an airplane with a total wing surface of 140 . At a certain speed the difference in air pressure below and above the wings is 3.0 of atmospheric pressure.Find the lift of the airplane

### Geometry

In a certain game, a player throws a standard 6-sided number cube twice per turn. What is the probability that the result of the first throw will be a 1, and the result of the second throw will be greater than 3?

### Math

The probability of a certain hockey player making a goal after hitting a slap shot is 1/5. How many successful slap shots would you expect her to make after 120 attempts? A.5 B.20 C.24 D.60

### Physics

A certain rain cloud at an altitude of 1.90 km contains 3.20 107 kg of water vapor. How long would it take for a 2.18-kW pump to raise the amount of water from Earth's surface to the cloud's position?

### Physics

An electric rod of 2000 watts rating boils a certain quantity if water in 10 minutes, the heat is generated for boiling this water is? answer is 12 X 10^5 Joules, but I cant solve it please solve it

### Physics

A certain circuit consists of an inductor of 50 mH in series with a resistor of 130 Ω. At one moment, the current in the circuit is 12 A, and decreasing. How long will it take for the current to fall to 4.8 A? Answer in units of s.

### Math

A certain amount of money is equally divided between some persons .If there were 8 persons more each would have got one rupee less. The number of the person and the amount are?

### maths

coffee costing $250 per kg was mixed with chicory costing $75per kg in th ration 5:2 for a certain blend. if the mixture was sold at $230 per kg,find the gain or loss percent.

### chemistry

Write the balanced net ionic equation for the following reaction and determine the conjugate acid-base pairs. HNO3(aq)+Li2CO3(aq)<--->LiNo3(aq)+LiHCO3(aq) Which component in the net ionic equation is the acid, the base, the conjugate base, and the conjugate acid Thank ...

### chem

part 1 When 0.633 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 103C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay attention to significant figures. Do ...

### (NOT for Ms. Sue)

1) Why was the Department of Defense created? A) to place the U.S. Army and Navy in one executive department B) to establish a military chain of command C) to end disagreements between the U.S. Army and Navy D) to lessen the instance of military abuse of power** 2) Which of ...

### Algebra

1.Tell whether the sequence is arithmetic. If it is, what is the common difference? -19,-11,-3,5... A.yes;5 B.yes;6 C.yes;8 D.no 2.What is the slope of that passes through the pair of points? (-6,8),(2,3) A.-3/8 B.-1/8 C.-7/8 D.-5/8 3.Write an equation in point-slope form for ...

### Spanish III

Help me not fail my Spanish III class? Write the 'yo' form preterite of the following verbs. 1. comenzar 2. practicar 3. jugar 4. almorzar 5. tocar 6. buscar 7. llegar 8. pagar 9. cruzar 10. empezar Fill in the blank with the correct form of the verb in the preterit tense. 1. ...

### Chemistry II

C4H4 (g) + 2 H2 (g) --> C4H8 (g) Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon and hydrogen are combusted, carbon dioxide and water are the products. Using the enthalpies of combustion for C4H4 (-2341 kJ/mol), C4H8 (-2755 kJ...

### Chem HW!! Difficult! HELP!

Urea (H2NCONH2) is used extensively as a nitrogen source in fertilizers. It is produced commercially from the reaction of ammonia and carbon dioxide. 2 NH3(g) + CO2(g) ---Heat pressure---> H2NCONH2(s) + H2O(g) Ammonia gas at 223°C and 90. atm flows into a reactor at a rate...

### Chemistry

One reaction of iron with hydrochloric acid is represented by the following thermochemical equation. Fe(s) + 2HCl(aq) ? FeCl2(aq) + H2(g); (Delta)H°= –87.9 kJ How much heat is liberated at constant pressure if 0.215 g of iron reacts with 40.4 mL of 0.579 M HCl? How much ...

### Chemistry - Le Chatelier's Principle

Hi, I have a question regarding the following chemical equilibrium equation: 2CrO4^2- + 2H3O^+ <--> Cr2O7^2- + 3H2O The question is: how would you manipulate the above equation to produce more Cr2O7^2- ions without adding any Chromium based compounds? I understand the ...

### Chemistry

A student places 0.025 moles of solid sulfur and 0.100 moles of nitrogen monoxide gas in a closed 1.00L container and 0°c for several days. Calculate the number of molecules of NO in the 1.00L container after equilibrium is reached, given the following thermodynamic data. I ...

### MATH213

13. For each of the following, find all possible whole-number replacements that make the following statements true. 2 • ______ + 15 < 27

### Intermediate Algebra

for the following equation, state the value of the discriminate and then describe the nature of the solutions, from the following statements. -20x^2-5x+3=0

### English

I left out the following sentence. Complete the following fill-in-the-blank activity using as many synonyms as possible.

### science

I have two questions I need help with please. Thank you! 1)Mitochondria, the energy-processing organelles in eukaryotic cells, have their own DNA, separate from that of the cell’s nucleus. Which of the following choices best explains the presence of mitochondria in ...

### Math

1. Which of the following is equivalent to 8 2/5? a.42/5 b.34/5 c.39/5 d.24/5 2. Which of the following fractions is between 3/5 and 2/3? a.3/6 b.3/4 c.5/8 d.7/10

### science --- check my answers!

help pls asap!!!!! check my answers!!! 4.) A certain object has a volume of 25.0 mL and a mass of 100g. What is the density of the object? a)0.250 g/mL b) 4.00/mL*** c)125 g/mL d) 2500 g/mL 5.)Which of the following is a chemical property of aluminum? a)The melting point of ...

### Biology Chemistry Part

I'm trying to calculated the rate of reaction In this lab I took a 50 mL beaker and poured in 10 ml of cold distilled water into it, I then poured in 30 ml of original enzyme solution (I believed we used cold potato juice or something), I then took a piece of paper and placed ...

### Math Help

Hi! I need help with these two questions. Thanks! 1.) Look for the first four terms for the following sequence below. an=n(n^2-6) 2.) For this question, remember that your answer has to begin with the second term of the following sequence. Look for the next four terms of the ...

### chemistry

A 1.2431 -g alloy sample was analyzed for its copper content iodometrically. The alloy was dissolved in hot, concentrated nitric acid and prepared for analysis. The addition of excess KI(aq) solution precipitated the copper as cuprous iodide and liberated elemental iodine ...

### Biology again

could someone explain the importance of replication for maintaining genetic stability? i am guessing that the DNA during replication needs be be copied exactly like before so as to pass on certain genes..but i'm a bit confused and don't know what else to say...

### BiOO agAIN

could someone explain the importance of replication for maintaining genetic stability? i am guessing that the DNA during replication needs be be copied exactly like before so as to pass on certain genes..but i'm a bit confused and don't know what else to say...

### Math

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. (a) 1 ounce of Tostitos provides (

### Physics (Online w/ no teacher)

The mass of a certain neutron star is 3.0 X 10 to the 30th (1.5 solar masses) and its radius is 8,000 m (8 km). What is the acceleration of gravity at the surface of this condensed, burned-out star? My answer was 31,265,625 X 10 to the 12th km/s squared.

### math116 algrabra

I really need help i am so stuck i can not figure this out we are trying to find the slopes here is an example of what i am doing i get everything all theway till a certain point example: (-4,9);2x=5y+6 the answer is 2/5x+53/5 but i don't know how they came up with 53 that is ...

### Statistics

Given IQ~N(100, 256) find P(IQ > 115). Be certain to set your calculator to FLOAT 4 to match my answer exactly. I need to know how to figure this out on my calculator.... no one has taught me how to use my calc and I am so confused.... someone please help!

### English/ Literature

What do I do for diction? My teacher's definition is a word choice intended to convey a certain effect. Help, please! Also What is the significance of the title: The Lord of the Flies I think the title hardly goes with the main idea of the book

### Chemistry

I need help in solving this problem: A certain substance has a heat of vaporization of 42.46 kJ/mol. At what Kelvin temperature will the vapor pressure be 5.00 times higher than it was at 291 K? I know that I have to use the Clausius-Clapeyron equation, but what would I be ...

### Acc. Algebra 2

Jan invested $1200 at a certain simple interest rate and $2200 at 3%higher. Her annual earnings were $253. Find the two interests rate if she earned $121 more on the larger investment than on the smaller.

### statistics

Solve the problem. Round to the nearest tenth unless indicated otherwise. The amount of rainfall in January in a certain city is normally distributed with a mean of 4.3 inches and a standard deviation of 0.3 inches. Find the value of the quartile .

### Early Childhood Education

Inventive spellers typically: A. write only words they are certain can be spelled correctly. B. never learn conventional spelling. C. omit consonants in words. D. progress through a series of stages. Is the answer D.?

### science

a horticultural wants a plant that produces flowers with a certain size color and fragrance but it now aware of any one plant having all of these traits. the quickest way she could achieve her goal would be to apply the process of_____________

### math

A gallon of a certain kind of paint will cover 224 square feet of surface. In painting two walls; one 36' by 8' and the other 24' by 9', the number of gallons of paint used is: I'm sorry I don't really know what to do, could someone please explain?

### Stats

Consider randomly selecting a student at a certain university, and let A denote the event that the selected individual has a Visa credit card and B be the analogous event for a MasterCard. Suppose that P(A) = 0.6 and P(B) = 0.4 a) Could it be the case that P(A n B) = 0.5? Why ...

### pre-calc college

a certain type of fencing comes in rigid 10 foot long sections. Four uncut segments are to be used to fence in a garden on the side of a building. what value of x will make the garden as large as possible?

### science

the mean weight of 500 males students at a certain college is 151 lb and standard deviation is 15lb .assuming the weights are normally distributed, find how many students weigh between 120 and 155 lb ..ii) more than 185 lb

### Educational thechnonolgy

Lines are used in a design to _____.Choose all that apply. A.Create movement B.lead the eye across the page C.describe the relationship between certain colors D.divide a page into sections

### English

Posted by John on Wednesday, July 2, 2008 at 4:36pm. 9. Four Seasons in One Day? READ AND LEARN Tony : Hello, may I speak to Mr. Smith? Miss Ford : Who's calling, please? Tony : This is Tony. I'm Mr. Smith's son. Miss Ford : Oh, hello. Hold on a second. Mr. Smith : Hi, Tony. ...

### Chemistry

Magnesium metal reacts with hydrochlroic acid according to following reaction: Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2 (g) over interval of 10.00s, the mass of Mg changes by -0.22g. What is the corresponding rate of consumption of HCl (in Mol/s) ? So what i think i should do is ...

### Math help plz check my answers!

1. Write the ratio in the simplest form. 50:10 25:5 10:2 5:1 1:5 2. Solve the following proportion. r/5= 9/21 r = 9 r = 2.14 r = 11.66 r = 37.8 3. A recipe calls for 3 cups of flour to make 3 dozen cookies. Use the proportion to calculate how much flour is needed to make 9 ...

### psychology

This solution covers the following theories of emotion: the James-Lange theory, the Cannon-Bard theory, the two-factor theory, and the cognitive-mediational theory. It begins by defining them and explaining them in terms of the interactions between their components: an emotion...

### LINEAR EQUATIONS

Kathleen is ordering wraps from a local sandwich shop. The total charge includes a set delivery fee plus the price per wrap. Each wrap is the same price. Kathleen asks about specific orders and is given the following info: If she orders 20 wraps, the total cost will be $100 If...

### Science

Why are salts, such as sodium chloride made of elements found on opposite ends of the periodic table? a. elements on the far left tend to form positive ions while those on the right tend to form negative ions. b. elements on opposite ends of the periodic table have similar ...

### computer

When creating a mail merge to send out a form letter, where should you store the names and addresses of the recipients? A. Main document B. Data source C. Label file D. New address document 2. Which one of the following Word features allows you to copy multiple paragraph-...

### chem

"The percentage of sodium hydrogen carbonate, NaHCO3, in a powder for stomach upsets is found by titrating .275 M hydrochloric acid. if 15.5 mL of hydrochloric acid is required to react with .500 g of the sample, what is the percentage of sodium hydrogen carbonate in the ...

### Chemistry, equilibrium molarity

At a particular temperature, K=3.75 for the following reaction. SO2(g) + NO2(g) (reversible arrows) SO3(g) + NO(g) If all four gases had initial concentrations of 0.500 M, calculate the equilibrium concentrations of the gases. This is what I've done so far: (.5+x)2/(.5-x)2=3....

### Chemistry(Please check!!)

Write the balanced, complete, and net ionic equations for each precipitation reaction. 1) AgNO_3 + CoCl_2 ---> BE: AgNO_3(aq) + CoCl_2(aq) ---> AgCl_2 (aq) + Co(NO_3)(aq) CIE: Since the balanced equation is all (aq) there is no reaction so no complete or net equation. 2...