# a certain reaction has the following generaln form

72,592 results, page 93

### 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 ...

### 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?

### 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

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).

### 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 ...

### 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...

### 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?

### 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 ...

### 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...

### 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...

### 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

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+ ...

### 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 ...

### 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 ...

### 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 ...

### 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...

### 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 ...

### 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...

### 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 rap 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 ...

### chemistry

Under the appropriate conditions, NO forms NO2 and N2O: 3NO(g) <--> N2O(g) + NO2(g) Use the values for delta G naught for the following reactions to calculate the value of Kp for the above reaction at 500.0 C 2NO(g) + O2(g) <--> 2NO(g) delta g=-69.7 kJ 2N2O(g) <...

### Business

If you were to purchase stock, what sort of information about the company’s stock would you use to make your decision to buy shares of a certain company?

### Chemistry

A certain vinegar is 6.02% acetic acid (HC2H3O2) by mass. How many grams of HC2H3O2 are contained in a 355-mL bottle of vinegar? Assume a density of 1.01g/mL.

### college physics

A certain 9-V battery measures 9.0 V with no load connected to it, but only 8.5 V when connected to a radio which draws 150 mA of current. What is the internal resistance of the battery?

### General Chemistry

A certain protein was found to have 0.855% zinc by mass. Determine the minimum molecular mass of the protein. How do I go about solving this?

### math

malik paid 480$ to purchase a certain number of pizzas, but 2 extra were delivered which decreased the amount per pizza by 1$. how many pizzas were delivered?

### Algebra

$9500 is invested part of it at 12% and part of it at 7%. For a certain year the total yield is $960.00. How much was invested at each rate? Please show work

### Math

For a certain product, one case holds 8 boxes and each box holds 12 items, how many total cases are needed to hold 500 items?

### science

A car traveling along the highway needs a certain amount of force exerted on it to stop. More stopping force may be required when the car has:

### chemistry

For a certain change, value of Delta U is -2.37 kJ. During the change, the system absorbs 650 joules. How much work did the system do? Please help! I get 3.02 but is not correct!!

### Physics

A certain spring stretches 5.8cm when a load of 38N is suspended from it. How much will the spring stretch if 48N is suspended from it (and it doesn't reach its elastic limit)?

### science

A certain quantity of electricity deposits 0.54grams of silver nitrate solution. What volume of H2 will be liberated by the same quantity of electricity at 27 ° C and 750 mm of Hg pressure

### Math

The formula t =vh/4 can be used to find the time t in seconds it will take an object to fall from a certain height h in feet .how long did it take the applet o fall?

### Math

A certain marine engine has cylinders that are 3.55 inches in diameter and 3.74 inches deep. Find the total volume of 4 cylinders? hard question is there formula

### Maths

The count of bacteria in a certain experiment was increasing at the rate of 2 per hour. Find the bacteria at the end of 2 hours if the count was initially 500000.

### Physics

A balloon is filled with a gas which is lighter than air. It is observed to rise in air up to a certain height. State the reason why the balloon stops rising.

### Chemistry

When a solution of a certain gadolinium salt is electrolyzed with a current of 1.0 A for 2.0 h, 0.025 mol of Gd metal forms. Calculate the charge on the gadolinium ion in the salt.

### Chemistry

Why are metals malleable? A. Because they reflect incoming photons B. Because they are made of atoms that have tightly held electrons C. Because of their structure and uniform bonding in all directions D. Because their lattice energy is very high I think the answer is c but I ...

### Social Studies

Which occurrence is not characteristic of global warming? a. melting mountain glaciers in the south pole b. stabilization in the sea level due to warm weather*** c. greater amounts of precipitation d. loss of habitat for certain species

### Java

1. Which of the following expression evaluates to a value of 15? 1+2x3+4 (1+2)x(3+4) 1+2x(3+4) (1+2)x3+4** 2. If x is an int which of the following statements adds 5 to the current value of x and store the new value back in x? x=5; x+5; ** x =+ 5; x += 5; 3. If x is an int ...

### Chemistry

I am stuck on b)... 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), ...

### 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 ...

### Algebra 1 ( bobpursley)

1. Write an equation in slope-intercept form for the line that passes through (5,0) and is perpendicular to the line given by y = -5/2x + 6. A: m = 2/5 y = mx + b 0 = (2/5)(5) + b 0 = 2 + b b = -2 y = 2x/5 -2? 2. Write an equation in slope-intercept form for the line that ...

### Chemistry

Factors affecting reaction rate. Use collision theory to explain. Factor: nature of the reactant Affect on rate: more or less reactive based on its chemical identity. reactivity: aq>g>l>s Explanation: For the other factors, we had to explain it based on whether the ...

### engineering

what is the SI form A)MN/ks^2 B)kN/ms

### quadratic

what is -x^2+4=(3x-1)^2 in the form ax^2+bx+c=0

### simplest form

6 8

### math

4.10:1.90 in the form of n:1

### simplest form

what is 1/2+5/6 in simplest form

### simplest form

what is the simplest form of 1/4?

### science

All eukaryoyic cells have membrane compartments called ________ that form when part of the cell membrane an object and pinches off. That statement doesn't make sense.. All eukaryotic cells have membrane compartments called______that form when part of the cell membrane whats? ...

### Chemistry

1. Which of the following will result in a chemical change? A. Melting ice to obtain water B. Evaporating alcohol into vapor C. Drying wood in a shed D. Burning coal in a furnace(My answer) 2. A salt is obtained as a reaction between A. a nonmetal and a metal. B. a base and ...

### Algebra 116

I have like 13 questions i need help with so here they go. 1. In 1991 the life expectancy of males in a certain country was 70.1 years. In 1995 it was 72.6 years. Let E representn the life expectancy in years and t represent the number of years since 1991. a.The linear ...

### trigonometry

Hint: The total of angle measurements inside any pentagon is the same. Hint: Look up the mathematical definition of an arithmetic sequence. IF THE MEASURES OF THE ANGLES OF A PENTAGON FORM AN ARITHMETIC SEQUENCE, WHAT ARE THE GREATEST AND LEAST MEASURES EACH ANGLE CAN HAVE? ...

### English

1. She asked me to hold the line. 2. She asked me to hold on. ----------------- Are both the same? Do you have some other similar expressions? 3. He handed me the document without comment. 4. She handed me the document without comments. (Are both OK? Do we have to use the ...

### finance, please help

1. Calculate the present value of an investment given the following information: (a) Years—20, (b) Rate—10%, and (c) Future Value—$20,000. 2. Calculate the future value of an investment given the following information: (a) Years—10, (b) Rate—5%, and (c) Present Value...

### chemistry

Which of these elements has the electonic configuration of The energy absorbed or released when an electron is added to a gaseous atom is known as Which of these elements behave partly as an alkaline metal as well as a halogen element? Hydrogen can be obtained economically as ...

### Informal Logic 103

Write two arguments in English, one in the form of modus ponens and one in the form of modus tollens. Then, write the arguments in symbols using sentence letters and truth-functional connectives. (If your computer does not have all the symbols needed, use some other symbol you...

### spanish

1). What is a "cognate"? 2). Why is learning cognates the most efficient and rapid way to learn to read, speak, increase vocabularly and get high marks on tests in a foreign language? Bonus question: What is the relationship between "cognates" and "etymology"? Definition of ...

### Algebra

I have an assignment that asks me to write an equation in slope-intercept, point-slope, or standard form for the information given and to explain why the chosen form would be best. Below is the information given. 1. passing through (-1,4) and (-5,2) 2. that has slope 2 and y ...

### Chemistry

A XX-g sample of methane, CH4, is mixed with YY atm of O2 (an excess) in a VV L combustion chamber at 125.0°C. The combustion reaction to CO2 and H2O is initiated and the vessel is cooled back to 125.0°C. What is the final pressure in the combustion chamber assuming the ...

### intermediate algebra

The danville Express travels 280 miles at a certain speed.If te speed were increased by 5 mph the trip could have been made in 1 hr less time.What was the actual speed?

### Physics

A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 24 m/s west,and the acceleration of the car has componets of 2.4 m/s^2 east and 1.8m/s^2 south. Find the total displacement of the object (from t=0 to 25)

### Statistics

Electricity bills in a certain city have mean $120.08. Assume the bills are normally distributed with standard deviation $14.40. Find the value that separates the lower 52% of the bills from the rest.

### music

what is the definition for bimary form in music???????????????????????????? If you truly mean bimary, here are the results I got when I searched in Google: http://www.google.com/search?q=music+bimary+form&start=0&ie=utf-8&oe=utf-8&client=firefox-a&rls=org.mozilla:en-US:...

### english - ms. sue please help

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

### physics

A certain FM radio station broadcasts jazz music at a frequency of 90.7 MHz. (Radio waves are electromagnetic)? Find the waves period? I got 1.1*10^-8 and it is not right.

### Math

Eva invested a certain amount of money at 9% interest and $1600 more than that amount at 11%. Her total yearly interest was $760. How much did she invest at each rate?

### Math

Eva invested a certain amount of money at 9% interest and $1600 more than that amount at 11%. Her total yearly interest was $760. How much did she invest at each rate? 9%? 11%? Thanks for any of your help

### physics

Battery supplies a potential difference of 6v At a certain temperature the current in the 45ohms resistor is 0.08A How would you calculate the potential difference across the thermistor? thanks :)

### chemistry

a certain volume of a gas at 125K was heated such that its volume and pressure became four times their original values. what is the new temperature of the gas?

### physics

An electric field of 264,000 N/C points due west at a certain spot. What are the magnitude and direction of the force that acts on a charge of -6.75 µC at this spot? magnitude?

### physical science

a car traveling along the highway needs a certain amount of force exerted on it to stop.more stopping force may be required when the car has: ;

### Chemistry

In a certain mountain range, water boils at 92°C. What is the atmospheric pressure under these conditions? The enthalpy of vaporization of water at 100°C is 40.7 kJ/mol. R=8.31J/(K*mol))

### Chemistry

The specific heat of a certain type of metal is 0.128 J/(g-c). What is the final temperature if 305 J of heat is added to 86.9 g of this metal initially at 20 degrees C? Tfinal = ___ C

### math

Eva invested a certain amount of money at 5% interest and $1500 more than that amount at 17%. Her total yearly interest was $750. How much did she invest at each rate?

### Algebra

Eva invested a certain amount of money at 12% interest and $1500 more than that amount at 13%. Her total yearly interest was $800. How much did she invest at each rate?

### grade12 bio

Some genes are said to be “linked”. Explain this term and the implications it has as to the inheritance of certain traits. Provide 2 (human) examples of linked genes?

### math

During the dinner rush, a certain restaurant cooks about 25 pounds of spaghetti per hour. How many grams of spaghetti do they cook per second?

### Social Studies (Ms. Sue)

What are two inventions that made modern city life possible? I know one of the inventions are skyscrapers but I am not certain of the answer to the other one.