# a certain reaction has the following generaln form

72,211 results, page 86

### Math

Need help understanding half-life/decay problem for upcoming test. A water filter is constructed to form a foam that removes 25% of the particulate impurities for each inch of foam. 1.What percentage of the particulate impurities will be removed by a filter consisting of two ...

### maths

Hi, could someone please tell me how I would go about working these out: (the answer must be in the form a(sqroot)b where a and b are integers and b is as small as possible.) 1) Simplify (sqroot)500 2) Simplify (sqroot)50 x (sqroot)60 Also.. Simplify the following fractions so...

### Computer Programming

Hello, Any help on the following problem would be greatly appreciated. The assignment is done with .java in eclipse. I have a class and a form with a Jlist, 2 text fields to enter the check amount and the ending Balance and a calulate button. I have some aspects working, but ...

### Electrochemistry

I have an electrochem based question. I'm trying to solve for E* based on a chart in my book. I know the equation for solving this is E*= E*ox + E*red. The chart in my book gives a list of reactions and a E*red value. My teacher told us that the greater, or more positive, E*...

### chemistry

Which factors below affect the rate of a chemical reaction? -Collision frequency -Number of collisions having the least activation energy -Intermolecular orientation -Being Exothermic or Endothermic Also, what formula would I use for this problem: "What is the hydroxide ion ...

### Chemistry - URGENT

So, I go to high school in Texas and we have this AP Chem lab due online tomorrow night by midnight and I need some serious help on these questions: Lab Temp 0.2°C Experiment Trial Time in seconds Trial 1 Trial 2 Average Time 1 1 2 256 275 268 2 1 2 215 226 ...

### government

a custom duty is a tax on a. the making, selling, or using of certain products b. the assets of a person who died c. goods brought into the country from another country b

### Physics(check)

17)Under what conditions can an object travel a certain distance and yet its resultant displacement be zero? When the final position is the same as the initial position.

### Calculus

A certain radioactive material decays exponetially. The percent, P, of the material left after t years is given by P(t)= 100(1.2)^-t a)Determine the half life of the substance

### math

In a certain town, 25% of people commute to work by bicycle. If a person is selected randomly from the town, what are the odds against selecting someone who commutes by bibycle? A). 3:1 B). 3:4 C). 1:3 D). 4:1

### Algebra 1

y intercept is when x is zero y=3.2 *0 -4 yintercept 0,-4 I am not certain about your remarks on the slope I'm sorry, I was trying to graph the equation and identify the y intercept for y= 3/2x-4. I very much appreciate your help. Thank you.

### Physics

A certain car is capable of accelerating at a uniform rate of 0.85m/s2. What is the magnitude of the car's displacement as it accelerates uniformly from a speed of 83km/h to one of 94km/h?

### science

a project is lauched 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?

### chemistry

A certain volume of a gas at 298k is heated such that its volume and pressure are now four times thier original value. What is the new temperature?

### physics

A certain car is capable of accelerating at a uniform rate of 0.82 m/s2. What is the magnitude of the car’s displace- ment as it accelerates uniformly from a speed of 85 km/h to one of 95 km/h? Answer in units of m.

### statistics

The weights of certain machine components are normally distributed with a mean of 9.75g and a standard deviation of 0.08g. Find the weights that separate the top 5% and the bottom 5%.

### Physics HELP!!

The mass of a certain neutron star is 3.0 1030 kg (1.5 solar masses) and its radius is 7550 m. What is the acceleration of gravity at the surface of this condensed, burned-out star?

### physics

The distance between two successive crests of a certain transverse wave is 1.05 m. Eight crests pass a given point along the direction of travel every 17.9 s.

### math

a person in a certain family eats 727lbs of fruit and vegetables in a year. What is the average consumption in one day? Use 1 year= 365 days.

### Physics

A certain freely falling object requires 1.50 seconds to travel the las 30.0 meters before it hits th ground. From what height above the ground did it fall?

### BIOLOGY

An animal has the genotype Cc for a particular trait. If, through meiosis, a certain female produces 100 eggs, how many of these eggs would have the C gene? & PLEASE HELP &

### chemistry

Cisplatin, a drug used in the treatment of certain types of cancer has the molecular formula Pt(NH3)2Cl2. How many moles of compound are in 254.09 grams of the compound?

### math

find the differential of dy of the given function. y=3x-4sec(2x-1) The answer i got was dy=(3-8sec(2x-1)tan(2x-1))dx I am not entirely certain i got this correct. if you could check this for me, it would be a big help. :)

### physics

a 10kg toy mootorized boat uses 2.0 W of power, has a constant accel from rest and reaches a certain speed in 10 s on a horizontal surface. what was the final speed ?

### algebra

a certain mountain has an elevation of 19523 feet. in 1922, the glacier on this peak covered 5 acres. by 2001 this glacier had melted to only 1 acre.

### school

A ball thrown vertically upward reaches a certain height and comes down again. What can you say about its kinetic energy at the maximum height?

### Math

In a certain culture of bacteria, the rate of increase is proportional to the number present. If there are 10000 at the end of 3hours and 40000 at the end of 5hours,how many were there in yhe beginning?

### Chemistry

when a certain amount of calcium chloride (CaCl2) was dissolved 100.g of water, the boiling point rose from 100.0*C to 104.4*C; calculate the molality of this solution.

### science

If a scientist wished to to determine the effect of a certain herbicide on wee growth he would include a control in the investigation. Suggest a suitable control in this case.

### physics

a certain coiled spring with an unstretched length of 20cm require a force of 2N to stretch it by 0.2cm. What is the work done in stretching it by 2cm. If the elastic limit is nt execeed.

### math

Kathy went shopping with a certain amount of money. She spent 1/4 of it on shoes, 1/5 of it on lunch and 78 of it on cloths. She had 21 left. How much money did she have at first.

### Math

A certain deck of cards consists of only 10's, Jacks, Queens, and Kings, and is divided up evenly in a 52 card deck. what is the probablity of NOT drawing a jack? HELP ASAP!!!!!!!

### chemistry

A reaction with an equilibrium constant Kc = 1.5 x 1021 would consist of which of the following at equilibrium: A. some reactants and products with reactants slightly favored B. essentially all products C. essentially all reactants D. approximately equal reactants and products...

### chemistry

A reaction with an equilibrium constant Kc = 1.5 x 1021 would consist of which of the following at equilibrium: A) approximately equal reactants and products B) some reactants and products with reactants slightly favored C) some reactants and products with products slightly ...

### CHemistry

My professor gave us these question in call and we solved for it in class, however im not sure how we got the answers. I dunt really understand the concept of intermolecular forces if some can please help me i have a quiz tomorrow. A. For each pair of substance, identify the ...

### chemistry

for the reaction to generate 2‐phosphoglycerate (2PG) from 3‐phosphoglycerate (3PG, ΔG = 0.83 kJ/mol; ΔGo’ = 4.4 kJ/mol. (R = 8.31 x 10‐3 kJ•K‐1•mol‐1) a)What is the ratio of 3PG:2PG in cells at 37C? I got 5.52 as answer for this ...

### Chem

I have a few questions, if anyone can help me at all it would be amazing. i need this done by TOMORROW (03/03/2008) 1. Cyanogen has been observed in the atmopshere of Titan, Saturn's largest Moon, and in the gases of the interstellular nebulas. On Earth, it is used as a ...

### Chemistry

I have a few questions, if anyone can help me at all it would be amazing. i need this done by TOMORROW (03/03/2008) 1. Cyanogen has been observed in the atmopshere of Titan, Saturn's largest Moon, and in the gases of the interstellular nebulas. On Earth, it is used as a ...

### Chemistry

If 2.00 mL of 0.600 M NaOH are added to 1.000 L of 0.850 M CaCl2, what is the value of the reaction quotient and will precipitation occur? I've been trying this problem over and over and haven't been able to get it. I know precipitation will not occur from my previous answer ...

### science

3.If a gap in the fossil record exists between ancient and modern forms of a species, which of the following is the most appropriate conclusion? A. The gap indicates that gradualism must have occurred for the species to evolve from ancient to modern form.*** B. The gap ...

### 5th grade

I am not sure on this question. Can you help me. Question: How can you tell if 31/33 is already in its simplest form? I wrote my answer to the following questions, can you tell if it is right? Question: Can the Greatest Common Factor of 18 and 36 be greater than 18? My Answer ...

### check.

12. The substance produced by the light-reaction and used in the light-independent reaction is A. water B. oxygen C. hydrogen D. carbon dioxide hi there so I belive that the answer is b or d but i am leaning more toward b is that correct? Your question is really not phrased ...

### Early Childhood Education

Which of the following is NOT an example of a transition activity? A. Giving the children a 5-minute warning to alert them to upcoming changes. B. Having the children form a train with adults as the engine and caboose or with a dragon with head and tail C. Singing a song ...

### Chemistry

Follow up question: Explain why the reaction of aluminum metal with aqueous sulfuric acid solution has very nearly the same ΔH value as the reaction between aluminum metal and HCl? Consider the atomic level. All I have is that they have the same net ionic equations. The ...

### chem 100

Super confusing question im not sure how to approach a. Determine the concentration of lead ion in solution (the molar solubility) if PbI2(s) is in equilibrium with water. Ksp = 9.8*10-9 b. From part a, it should be clear that if Pb2+(aq) and I-(aq) are added together in ...

### Math

Which ratios does NOT form a proportion? 1. 24/96 , 27/108 2. 17/102 , 12/70 3. 21/51 , 35/85 4. 45/75 , 63/105 Which ratios form a proportion? Use cross products to test each pair. 1. 9/17 , 27/50 2. 12/35 , 24/75 3. 15/55 , 33/ 121 4. 12/35 , 20/70 Which ratio forms a ...

### Math(Please check answers)

These questions that I have completed are on a test review for my exam and I would just like to know if they are correct. These are only a few of the questions, I have more that are just not complete yet. Thank You! 1) List the intercepts for the graph of the following ...

### Math 8th Grade

I would greatly appreciate it if someone would please be kind enough to take the time and show me how to work these problems. Thank you very much Solve by finding y and graph using the slope and y-intercept: 3x-y=1(My answer -y=3x+1)which is wrong could not graph it. x-y=3 (My...

### chem

the volume of a certain bacterial cell is 1.39um^3. what is its volume in mm^3? what is the volume of exactly 1e4 cells in liters

### maths

Twice the Square of a certain whole number added to 3 times the number gives 90. Find the number.

### math

the square root of 5 less than 6 times a certain number is divided by the number and the quotient is 1.Find the number

### algebra

a certain positive number is equal to nine-tenths of the sum of the number and its reciprocal. find the number

### physics

. Consider a large number, N(0) , molecules contained in a volume V (0) . Assume that there is no correlation between the locations of the molecules (ideal gas). Do not use the partition function in this problem. (a) Calculate the probability P (V; N) that an arbitrary region ...

### Chem 2

A mixture containing KCLO3, K2CO3, KHCO3, and KCL was heated, producing CO2, O2, and H2O (water) gases according to the following equations: 2KCLO3 -> 2KCL + O2 2KHCO3 -> K2O + H2O + 2CO2 K2CO3 -> K2O + CO2 The KCL does not reacnder the conditions of the reaction. If ...

### chem Help please!

A water heater is fueled by the combustion of propane as described by the following reaction: C3H8(g) + 5 O2(g) --> 3 CO2(g) + 4 H2O(l) a) Determine how much heat is released if 11.2 moles of propane are burned at 298 K and at a constant pressure of 1.00 bar. b) Assume that...

### Art Appreciation

Identify the step of the Critical Process that will require attentive observation as you explore attributes such as lines, color, and symmetry. A) Iconography/Subject Matter B) Medium and Technique C) Form D) Context and Which step of the Critical Process will explore the ...

### Chemistry

For the reaction 4A (g)+3B (g)=C(g) the following data were obtained at constant temperature: Experiment- 1. Initial (A) (mole/L) 0.0500, 01000, 01000 , 0.0500 2. Initial (B) (mole/L) 0.0500, 0.0500, 0.1000, 0.0500 3. Initial (C)(mole/L) 0.0100, 0.0100, 0.0100, 0.0200 Initial ...

### adult education

Present, in journal form, the adjustments that would be made on July 31, 2011, the end of the fiscal year, for each of the following. 1. The supplies inventory on August 1, 2010 was $7,350. Supplies costing $20,150 were acquired during the year and charged to the supplies ...

### physics

An electron has a constant acceleration of 2.0 m/s2. At a certain instant its velocity is 10.9 m/s. (a) What was its velocity 2.5 s earlier? m/s (b) What is its velocity 2.5 s later? m/s

### math

in a certain geometric sequence, the third term is 8 and the sixth term is 125. what is the first term?

### math

in a certain geometric sequence, the third term is 8 and the sixth term is 125. what is the first term?

### Math

S is directly proportional to M^3. It is given that S=36 for a certain value of M. Find the value of S when this value of M is (a) doubled (b) reduced by 40%

### chemistry 12

The pH of a certain acid having a concentration of 0.20M was measured. The pH was 2.50. Was this a strong acid or weak acid?

### math ALG 2!

Four times a certain number is the same as the number increased by 78. Find the number.

### MATH

if 5 times a certain integer ìs subtracted from twice the square of the integer the result is 63. find the integer

### Math

If 7 times a certain number is subtracted from 630, the remainder is thrice the number. Find the number.

### algebra

One sixth of a certain number and three-eighths of the same number total 13. What is the number

### Math

If a certain square measures 2.5 feet on one side what is the area of the square and square inches

### maths

four times a certain number is equal to the number subtracted from forty.find the number

### Science

The dimensions of a certain water tank 8m*6m*4m.what is the pressure at the bottom of the tank,if the tank of half filled?

### Math

when 8 is added to a certain number, the result is 3 times as large as when 2 is subtracted from the number. what is the correct number?

### to bobpursley

An emergency breathing apparatus often placed in mines works via the following chemical reaction: 4KO2(s) + 2CO2(g) to make 2K2CO3(s) + O2(g) If the oxygen supply becomes limited or if the air becomes poisoned, a worker can use the apparatus to breath while exiting the mine. ...

### chem

I have a few questions on how to do a few problems that I got wrong for homework. 1. If 5.28 g of tin reacted with fluorine to form 8.65 g of a metal fluoride, what is the simplest formula of the fluoride? I know my biggest problem here was that I misread the problem and didn'...

### Chemistry (Regents level)

1- In the reaction Fe2O3 + 3 CO = 2 Fe + 3 CO2, what is the total number of moles of CO used to produce 112 grams of iron? a) 1.0 b)2.0 c)3.0 d)4.0 2- Given the reaction: 4Al + 3O2 = 2Al2O3 How many moles of Al2O3 will be formed when 27 grams of Al reacts completely with O2? a...

### Chemistry

Which of the following explains why there are so many differences in the properties of peptides and proteins? A) several amino acid sequences are possible for proteins and peptides B) some proteins are enzymes while others are not C) proteins and peptides include nitrogen D) ...

### Math

It is known that if the deer population falls below a certain level, m, then the deer will become extinct. It is also known that is the deer population goes above the maximum carrying capacity, M, the population will decrease to M. (a) Discuss the reasonableness of the ...

### math

the digits of a certain number of 3 arithmetical progression.Their sum is 15 and the number is 129 times its first digit.What is the number?

### Physics

When a mass of 28 g is attached to a certain spring, it makes 18 complete vibrations in 4.1 s. What is the spring constant of the spring? Answer in units of N/m.

### Physics1

When a mass of 21 g is attached to a certain spring, it makes 23 complete vibrations in 5.0 s. What is the spring constant of the spring? Answer in units of N/m

### Physics

When a mass of 21 g is attached to a certain spring, it makes 16 complete vibrations in 4.4 s. What is the spring constant of the spring? Answer in units of N/m

### physics

When a mass of 28 g is attached to a certain spring, it makes 19 complete vibrations in 3.9 s. What is the spring constant of the spring? Answer in units of N/m

### Physics

When a mass of 28 g is attached to a certain spring, it makes 17 complete vibrations in 3.0 s. What is the spring constant of the spring? Answer in units of N/m

### math ALG 2!

Four times a certain number is the same as the number increased by 78. Find the number i thought it was 20.plz help

### TRIG

the population of a certain city is 1.3 million people. if the population is growing at the rate of 4% per year what will the population be in 8 years

### math

Population of a certain country is decreasing by 0.8% every year. The population in 2015 is 9 million, what will be the population in 2016 is it 16200000

### science

Numerical problem : The dimensions of a certain water tank are 8m x 6m x 4m. What is the pressure at the bottom of the tank, if the tank is half filled?

### English

1. If you are stressed, you feel tense and anxious because of difficulties in your life. 2. If someone is stressed out, they are very tense and anxious because of difficulties in their lives. ============================== The above are form Collins Dictionary. Q1: Does it ...

### Business COMMUNICATION 340

I need help I am not sure how to revise these sentences without leaving out or leaving in to much information if someone would please help me. Revising Messages: Directness and Conciseness Revise the following short e-mail messages so that they are more direct and concise; ...

### Maths

Write the following expression into its simplest form? (1/x-1-1/xsquare-1-1/x+1-4/xsquare+1)/ xraise to 4/xsquare-1 Let's use the symbol ^ to mean "raised to the power of" when using exponents. I'll try to decipher your expression: [1/(x - 1) - 1/(x^2 - 1) - 1/(x + 1) - 4/(x^2...

### Chemistry

Insoluble silver carbonate, Ag2CO3(s), forms in the following balanced chemical reaction: 2AgNO3(aq) + K2CO3(aq) = Ag2CO3(s) + 2KNO3(aq). What mass of silver nitrate, 2AgNO3(aq), reacts with 25.0 g of potassium carbonate,K2CO3(aq),if there is at least 5.5 g of silver nitrate ...

### 6th grade science

What causes the clouds to form on the windward side of the mountain? This is my answer I have from what I have read!! The air cooling causes the clouds to form on the windward side of the mountain. When wind strikes the side of the mountain air is forced up. When air rises it ...

### Chemistry

a 40-year-old manger at a prominent legal firm in L.A experiences abdominal pain post lunch. He goes to the restroom a couple of times, but continues to experience pain and cramps. He evevtually decides to get himself examined. While questioning him, you learn that he consumed...

### organic chemistry

This is for a phase catalysis lab experiment 1. How is the phase transfer catalyst removed from the product? I said, by washing it with salt. 2. what purpose does washing with 15% (half-saturated) NaCl solution serve? I said, to remove bulk of water 3. There is a slight excess...

### Chemistry

Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g) delta H1? MgO(s) + 2HCl(aq) ->MgCl2(aq) + H2O(l) delta H2? To make these equations add up to the formation reaction of MgO, you will need to include the following: H2(g) + 1/2O2(l) delta H =-241.8 kJ Using Hess's Law and manipulating...

### Chemistry

ASpirin, c9h8o4, is prepared by reating salicylic acid, c7h6o3, with acetic anhydride, c4h6o3, in the reaction. c7h6o3 + c4h6o3---> c9h8o4 + c2h4o2 A student is told to prepare 45.0 g of aspirin. she is also told to use a 55.0 % excess of acetic anhydride and to expect to ...

### English

1. We can use less water when we do the dishes. 2. We can use less water when we are doing the dishes. 3. We can use only a little water when we wash a car. 4. We can use only a little water when we are washing a car. ===================== Are they all grammatical? What is the...

### grammar

1) Their kindness will give me the gift of patience... does this sound okay? 2)In this method, I could learn from different areas of study and eventually narrow my path and focus on a certain aspect of the field with pure confidence. Too many ands?

### 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?