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November 27, 2014

Search: chem experiment:

Number of results: 9,040

chem
experimental error is part of any experiment.suggest two possible sources of error on the experiment of the mole ratio of NaCL to that of NaHCO3.
February 29, 2012 by audu

physics/chem
n Fig. 21-41, three identical conducting spheres initially have the following charges: sphere A, 7Q; sphere B, -8Q; and sphere C, 0. Spheres A and B are fixed in place, with a center-to-center separation that is much larger than the spheres. Two experiments are conducted. In ...
March 31, 2008 by dave

Chem Help Please!
Separation / Chromatography Lets assume I have three component mixture of liquids. And I wish to determine the quantity of each component present. I have reference samples of two of the components but the other component is not identified. How do I design an experiment in ...
September 24, 2014 by Ilginsh

Chem Help Please!
Separation / Chromatography Lets assume I have three component mixture of liquids. And I wish to determine the quantity of each component present. I have reference samples of two of the components but the other component is not identified. How do I design an experiment in ...
September 24, 2014 by Ilginsh

Chem
2ClO2 + 2OH- --> ClO2- + H2O Experiment 1, M of [ClO2] = .060 M of [OH-] = .030 Rate of disappearance of ClO2 (M/s) = .0248 Experiment 2, M of [ClO2] = .020 M of [OH-] = .030 Rate of disappearance of ClO2 (M/s) = .00276 Experiment 3, M of [ClO2] = .020 M of [OH-] = .090 ...
February 10, 2008 by Anonymous

chem
An optical rotation study gives a result of alpha=+140 degrees. Suggest a dilution experiment to test whether the result is indeed +140 degrees, and not -220 degrees. -could polarimetry experiment be used to find the r and s isomer?
November 18, 2008 by Jason

physics
does anyone know who conducted the experiment or a credible description of the experiment that helped prove Einstein's thought experiment: the twin paradox? as in the experiment in which one cesium-beam atomic clock stays on Earth, while another one takes flight and the time ...
January 10, 2010 by frank

AP Chem
i always get the error analysis section of my lab wrong so i need a NON human error in an experiment involving the diffusion of gases Experiment: stick cotton ends of a Q-tip (one soaked in HCl and one in NH3) into either end of a drinking straw and measure where precipitate is
December 11, 2007 by Blair

ap chem
What type of experiment can be done to determine if a material is paramagnetic?
January 2, 2013 by mary

chem
Wich of the following is NOT true about the blank for the experiment, 'Analysis of a Complex Iron Salt'? A. The volume required to titrate the blank is subtracted from the volume used to titrate the analyte solution to give the "corrected volume". B. A blank is composed of the...
August 15, 2008 by Anonymous

chem
If 20.5 mL of a 5.256 M solution of benzoic acid is used in an experiment similar to experiment 4, how many grams of benzoic acid is in the starting solution? (molar mass of benzoic acid = 122.12 g/mol) Be sure to pay attention to significant figures. The answers are all in ...
February 4, 2013 by alice

Physics
A very important experiment was carried out at the end of the 1800’s involving testing for the speed of the earth through the ether. (a) State the name of this experiment (b) Describe why the light beams are perpendicular to each other at one stage of the experiment. (c) What...
August 31, 2009 by Alfred

Science
1. The ? is the part of an experiment that is not being tested and is used for comparison. (7 words) 2. The ? describes the steps you use during an experiment. (9 words) 3. After an experiment, scientists write a ? which summarizes their experiment and results. (10 words) 4. ...
August 26, 2008 by Happyface

chem
how does the tepmperature , pressure and mole parameter explain the suddden collapse of the can in imploding the can experiment?
October 28, 2012 by Lala08

biology
my quations are without changing appratus in an experiment how can the reliability of the experiment result be improved and also why can small changes in room temperature during the experiment be ignored thank you!!
October 29, 2008 by lila

chem experiment:
You are required to design an experiment to test Hess's law using the combustion of ethanol. Write a brief design for this experiment. What I wrote as my answer: Hess’ Law: is the algebraic addition of chemical equations yields a net equation whose enthalpy of reaction is the ...
May 17, 2007 by rob

Gen Chem II
You conduct another experiment on silver condensation. You add 8.0 g of silver nitrate to 200 mL of pure water. You attach a single 850 mAh AAA battery (at 1.3 V) to the electrochemical cell. You can assume that the entire battery charge is useable for electroplating. You get ...
November 18, 2013 by kyle

chem.
I really don't understanf how jameschadwick discovered the neutron. iread websites and read the 18 pg. article but what was his experiment?
December 12, 2010 by tj

Chem
When conducting an experiment on determining density, what would the variable be? not the mass or temperature...can't figure it out. Thanks -MC
February 5, 2014 by mysterychicken

chem
write the net ionic equation for the unknown titration reaction in this experiment. KHC8H4O4(aq) + NaOH(aq)----> KNaC8H4O4 + H2O(l)
April 7, 2008 by natash

Chem Help!!!!
In an experiment, 0.771g Cr(s)reacts completely with 0.712g O2 to form a single solid compound. Write a balanced equation
February 25, 2013 by Lisa

chemistry
A Biology student wants to know if Mountain Dew will make plants grow faster than water. As a Chemistry student, you have agreed to assist in the planning of the experiment to make sure the student designs a valid experiment. 1) What is the experimental question? 2) What is ...
September 15, 2014 by eer

Chem.
2KClO3 (s) ---> 2KCl (s) + 3O2 (g) For every mole of KClO3 that decomposes in the above experiment, how many grams of oxygen gas are produced? A.) 3 B.) 16 C.) 48
September 29, 2012 by Anonymous

psychology
When an experimenter's expectations about a behavior influence the results of his experiment, it is called a a.placebo effect b.self-fulfilling prophecy c.single-blind experiment d.double-blind experiment
April 7, 2014 by Indigo

CHEM 1LB
Which of the following safety precautions is unnecessary for the 'Mass Percent of ASA' experiment? A. Safety goggles should be worn. B. Do not ingest the aspirin used in this experiment as it may be contaminated with other chemicals. C. The FeCl3solution is acidic and ...
January 21, 2011 by Shawn Tabrizi

chem.
determine the quantity of NaOH whose concentration is 15% w/v to neutralize 176g H2SO4 , this is the exact problem and no its not an experiment. sorry to bother someone of you
March 19, 2011 by auro

chem
(5) In this experiment MnO4-is reduced to Mn 2+ by the unknown. What is the equivalent weight of MnO4- for this experiment? 52.68 (6) How many equivalents of electrons were transferred from the unknown solution? (7) What is the Normality of the 1.00 mL of the unknown solution...
October 27, 2011 by bry

Chem Help Please!!!
Experiment Design You are asked to separate a mixture of toluene and cyclohexane. Assume that they do not form an azeotropic mixture. Design an experiment to do this. You must provide the following information. a) A diagram of the equipment you will be. b) What distillate ...
September 3, 2014 by Kim

Gen Chem
epsom salts, household ammonia, and rubbing alcohol are also consumer chemicals that could be used in this experiment. what are the chemical formulas for these substances?
October 22, 2012 by Andrea

Chem
O3 + NO --> O2 + NO2 Write the rate law equation for the reaction. Explain how you obtained your answer. Experiment 1: [O3] .0010 [NO] .0010 Rate of formation of NO2 x Experiment 2: [O3] .0010 [NO] .0020 Rate of formation of NO2 2x Experiment 3: [O3] .0020 [NO] .0010 Rate ...
February 18, 2008 by Anonymous

Chem
In an experiment, 7.5 mol of a gas are held in a 3.5 L container at 39 c. What pressure does the gas exert if it is assumed to be ideal?
June 29, 2011 by Chris

Chem
I did an experiment for creating an ester. So basically I added an acid to an alcohol. We were to also add H2SO4 solution. Why did we add that?
March 25, 2009 by Lena

science
i had to make up an experiment for school. but my teacher said it wasn't an experiment. my hypothesis is that there is a relationship between divorce rates and teens school grades. how do i make this into an experiment. please help!
May 18, 2011 by Todd L

chem
In an experiment 4.0 g of ferrous ammonium sulphate, FeSO4.(NH4)2SO4.6H2O, is used. Since the oxalate in in excess, calculate the theoretical yield of the iron complex?
November 16, 2011 by Anonymous

chem expirement!
You are required to design an experiment to test Hess's law using the combustion of ethanol. Write a brief design for this experiment. What I wrote as my answer: Hess’ Law: is the algebraic addition of chemical equations yields a net equation whose enthalpy of reaction is the ...
May 17, 2007 by rob

chem
Given that the density of the supplied vinegar solution in this experiment is 1.025 g/mL, calculate the % acetic acid found in the vinegar sample.
April 15, 2014 by john

general chem
Please help me with this questions. Three hypotheses regarding the interaction of the oil, sugar and salt with water. What experiment(s) will you do to test hypotheses?
September 1, 2008 by Anonymous

Chem Lab Help
You are provided with 5 M solutions of sodium hydroxide and hydrochloric acid for use in this experiment (Separation). How you would have prepared these solutions. Thanks!
October 8, 2014 by Tom

Chem Help Please!
You are provided with 5 M solutions of sodium hydroxide and hydrochloric acid for use in this experiment (Separation). How you would have prepared these solutions. Thanks!
October 8, 2014 by Tom

Science
If an experiment disproves a scientists hypothesis, what should the scientist do next? A. develop a testable question B. revise the hypothesis and try the experiment again. C. develop a theory based on the data gathered in the experiment D. change the dependent variable. Is ...
August 26, 2014 by Gwen

gen chem 2
In the chemical kinetics experiment, determine the dilution of the stock bleach solution. The bleach used will be around 5.5% (weight/volume). Convert this to molarity
February 8, 2011 by jen

chem
In a laboratory experiment 259 ml of gas was collectedd over water at 24 degree C and 752 torr. Calculate the volume, that the dry gas occupy at STP?
November 24, 2012 by byke

chem
After obtaining a greenish color in an experiment what does this tellyou about the relative concentrations of H^+ and OH^- in the solution? pls help i really need a simople explanations about this.
December 3, 2012 by akira 12

Mat/116
An experiment is underway to test the effect of extreme temperatures on a newly developed liquid. Two hours into the experiment the temperature of the liquid measured to be -17 degrees celsius. After eight hours of the experiment the temperature of the liquid is -47 degrees ...
February 23, 2014 by Carla

mat/116
need an expression only to this word problem: An experiment is underway to test the extreme effect of a newly developed liquid. Two hours into the experiment the temperature if the liquid measured to be -17 degrees Celsius. After eight hours of h experiment the temperature of ...
February 23, 2014 by csrla

Gen Chem
In an experiment I used .139 grams of an Alka Selzter table. A question asks us to determine the amount of CO2 dissolved in 5.10ml of 6M HCl. How do you go about solving such a problem?
November 22, 2014 by Jessica

org. chem
why is it easier to remove excess acetic acid from the products than excess isopentyl alcohol? from the products of what? Did you perform an experiment in class and this is one of the lab questions? If so you will need to explain what you did in some detail; otherwise, we're ...
March 7, 2007 by Richard

Chem.
The experiment requires 1 mg per ml of iron (Fe3+). What mass of iron (III) nitrate hexahydrate (Fe(NO3) - 6H2O) would you need to dissolve in 1 litre to achieve this value?
February 17, 2010 by Purple

Chem
In the |Molecular Geometry Lab 1. List three ways in which models used in this experiment are inaccurate representations of orbitals? 2.explain why the ClF3 molecule is not a trigonal planar molecule?
November 2, 2010 by Leon

Chem Lab
Suggest another possible oxidising agent and reducing agent that can be used to replace potassium permanganate & iron (II) ammonium sulphate haxahydrate in experiment Redox Titration
February 9, 2012 by Wei AZ

Biology
hi! so for science we have to make an experiment on temperature. we have to base our experiment on the given materials (which include test tubes, aluminum foil, cotton, fan) i chose a fan and I'm thinking of doing an experiment on how the strength of wind affects body ...
November 9, 2012 by Cara

Science
If an experiment disproves a scientist's hypothesis, what should the scientist do next? 1. Develop a testable question. 2. Revise the hypothesis and try the experiment again. 3. Develop a theory based on the data gathered in the experiment. 4. Change the dependent variable. Is...
September 11, 2013 by Anonymous

science
If an experiment disproves a scientist's hypothesis, what should the scientist do next? 1. Develop a testable question. 2. Revise the hypothesis and try the experiment again. 3. Develop a theory based on the data gathered in the experiment. 4. Change the dependent variable. Is...
September 11, 2013 by Anonymous

Science
If an experiment disproves a scientist's hypothesis, what should the scientist do next? 1. Develop a testable question. 2. Revise the hypothesis and try the experiment again. 3. Develop a theory based on the data gathered in the experiment. 4. Change the dependent variable. Is...
September 12, 2013 by Anonymous

science
If an experiment disproves a scientist's hypothesis, what should the scientist do next? 1. Develop a testable question. 2. Revise the hypothesis and try the experiment again. 3. Develop a theory based on the data gathered in the experiment. 4. Change the dependent variable. Is...
September 12, 2013 by Anonymous

Chem
Radioactive 24Na with a half-life of 14.8 hours is injected into an animal in a tracer experiment. How many hours will it take for the radioactivity to fall to 12.5% of its original intensity? I am confused on what number to start with
August 27, 2013 by Colby

chem 1151 please help me
1 The mass of the magnesium metal when performing the calculation of the ideal gas constant experiment... After all measurements have been taken and the stopper is removed from the eudiometer, the liquid in the beaker can be
March 19, 2012 by linda

Physics
I have an experiment in which I drop a tennis ball ,, and measure its rebound height in every bounce. one of the question regarding this experiment is - were the collisions elastic or not ? support with evidence. How do these forces magnitude compare with the weight of the ...
July 31, 2011 by AfterLife

chem-Calorimetry
If the warm water in this experiment (Im not quite sure if you need more information) is at 98C, how much heat must be relesed in order for the temperature of 100. mL of water to decrease to 32C ?
March 31, 2008 by natash

Chem
I dont understand how Rutherford's gold foil experiment proved that the positive charge of the atom had a very small volume in comparison to the whole atom. Could someone explain this to me please?
July 9, 2009 by Lena

chem
In order for a precipitation reaction to occur the product must be insoluble. However in an experiment we formed precipitates of two compounds, KNO3 and NaCl which are soluble? How did this occur? What was the forcing condition in each case?
March 23, 2010 by kohel

AP Chem
At a particular temperature, K = 1.00 102 for the following reaction. H2(g) + I2(g) 2 HI(g) In an experiment, 1.23 mol H2, 1.23 mol I2, and 1.23 mol HI are introduced into a 1.00 L container. Calculate the concentrations of all species when equilibrium is reached.
January 8, 2012 by Bill

Chemistry
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 2 215 226 220.5  3 1 2 83...
March 16, 2013 by Jordan

Chemistry
In the experiment of Nucleophilic substitution reactions: Competing Nucleophiles 1)what would happen if all the solids in the nucleophile medium were not dissolved? How might this affect the outcome of the experiment? 2)Explain the order of elution you observed while ...
February 16, 2010 by Jennifer

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 2 215 226 220.5   3 1...
March 16, 2013 by Jordan

Chemistry - reaction kinetics
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 2 215 226 220.5   3 1...
March 16, 2013 by Jordan

chem
A scientist wants to make a solution of potassium phosphate, K3PO4 for a lab experiment. How many grams of K3PO4 will be needed to produce 575ml of a solution that has a concentration of K+ ions of 1.4M.
May 10, 2011 by alex

chem lab
hi im doing a post lab sheet for chem class. and im having a little trouble. i have: temperature 12.6 C -> 285.6 K Time 816 sec but im supposed to find 1/T(K) it looks like my classmate did this: 12.6 x 285.6 = 3598.56 however they gave me the response to group 2 also: and ...
October 16, 2010 by chem

chem lab
when setting up their experiment, a student discovered that the solution in their flask turned bright pink upon adding 2 drops of the indicator, even before beginning the titration. what do you suspect was the mistake that the student made?
April 7, 2008 by natash

egg protection device
Hi. I need to know how to make an egg protection device out of straws and duct tape. Thanks. Experiment! Experiment! Experiment!
January 13, 2007 by Anonymous

chemistry
An experiment is considered a controlled experiment if it contains tests with chemicals.
April 6, 2011 by Ashley Jones

psychology
What implications do the results of an experiment have for subjects that were not observed in the experiment?
March 4, 2013 by jenna

chem
why is the ring of ammonium chloride closer to the hydrochloric acid end in the ring of gases experiment? i can say is that NH4Cl has greater amount of molecular weight than ammonium. is it right. pls help
October 27, 2012 by Draden

physics
the estimate and uncertainty for experiment 1 is .15+-.01 and the .12+-.01 for experiment 2. Is the discrepancy between these two data sets significant? Why?
October 18, 2008 by Tiffany

Science
What is the difference between a controlled experiment and a natural experiment?
December 31, 2013 by Smiley

Statistics
2. (TCO 5) A company produces electronic equipments claims that 98% of their products never need any kind of maintenance. We selected 10 of their products and we wanted to know the probability that 8 of them never need maintenance. Choose the best answer of the following: (...
March 1, 2013 by JAR

psychology
What was the first experiment in which B.F. skinner tested the theory of operant conditioning? Details on the experiment? Any help would be appreciated. =)
October 5, 2008 by alexa

biology
an experiment with only two products used which are yest and sugar what are the outcomes? the procedure to conduct this experiment?
October 20, 2010 by help needed

psychology
The task is to redesign Milgram's experiment so no one is hurt, physically or emotionally. However, from my understanding, the experiment is designed to test how far subjects will obey an authority figure even if it means inflicting pain on another. To inform the subject, in ...
December 10, 2011 by Amanda

Chem Lab Help
Separation and purification A mixture of benzoic acid, benzaldehyde and butylamine. What kind of experiment should you design to obtain each of the three compounds in a pure state. Just need ideas in order to start this experimental design. Thanks!!!
October 6, 2014 by Tom

Chemistry
student did the Synthesis of Salicylic Acid experiment using 3.93 g of methyl salicylate. This was the limiting reagent for his experiment. What is the theoretical yield of salicylic acid for his experiment? The theoretical yield is:
November 16, 2010 by Lena

Science
What experiment did Rudolph Virchow do? What prior information did he use to help him with his research/discovery? What tools did he need to complete his experiment?
September 21, 2010 by Jay

Science
What experiment did Matthias Schleiden do? What prior information did he use to help him with his research/discovery? What tools did he need to complete his experiment?
September 21, 2010 by Jay

Chemistry
Our class did an expeiment of adding sodium carbonate and calcium chloride. The experiment only yielded 28% of the calculated yield. The class did the experiment as a group (there are only 4 students in our class) and the experiment was closely supervised by our teacher to ...
October 26, 2011 by Robert

chemistry
In one experiment, the reaction of 1.00 g mercury and an excess of sulfur yielded 1.16 g of a sulfide of mercury as the sole product. In a second experiment, the same sulfide was produced in the reaction of 1.52g mercury and 1.02g sulfur. a) What mass of the sulfide of mercury...
September 20, 2008 by lisa

Chemistry
1) For a freezing point depression experiment we had to create an ice bath and add salt to the ice. I have to answer the question, why was salting the ice necessary in order to complete the experiment and how does this apply to the principles/concepts behind this experiment? ...
February 21, 2012 by Hannah

trig
A 600,000-cell bacteria culture is needed for a lab experiment, but you only could purchase 1,000 cells. If the cells double each day, exactly how long will it be before the experiment can be run? Create a model for the bacteria. If the experiment is in seven days, how many ...
December 3, 2012 by Amanda

General Science
you plan an experiment to test the growth of beans using three different fertilizer. What are the dependent and independent variables in the experiment?
July 24, 2010 by Diane

Biology
Why are most factors held constant in a scientific experiment? Answer: the only part of an experiment that ever changes is the independent variable.
August 27, 2014 by Please Help

org. chem.
A student who was isolating aspirin stopped the experiment after the filtration step with alumina. One week later, the methanol was evaporated and the experiment was completed. The melting point of the aspirin was found to be 110-115 degress Celsius. Explain why the melting ...
October 6, 2009 by CM

chem
A chemistry lab experiment requires 33.3 g of silver nitrate. How many grams of a 14.1% by mass solution of silver nitrate should be used? _________g Solution
May 2, 2011 by jan

Physics
Three identical conducting spheres initially have the following charges: sphere A, 4Q; sphere B, -9Q; and sphere C, 0. Spheres A and B are fixed in place, with a center-to-center separation that is much larger than the spheres. Two experiments are conducted. In experiment 1, ...
January 29, 2012 by Tyler

chem
You have a large amount of 7.50M stock solution. You need 1.80L of 3.00M solution for an experiment. How would you prepare the desired solution without wasting any stock solution?
November 8, 2012 by chemdummy

Chem Webwork
Complete the table below: What are the pH values if you take into account that the 8.00 mL of 0.10 M Acid was first diluted with 100 mL of water (like it will be in the experiment you perform in lab)? mL NaOH: 0.70 pH w/ HCl: 2.14 pH w/ HC2H3O2: ??? I got pH w/ HCl, but I can'...
April 25, 2011 by Michelle

chemistry
Ethanol was used in the solutions to help dissolve the acetylsalicylic acid. Ethanol is slightly acidic, and will react with NaOH. Describe a blank correction experiment; i.e., what experiment you might do to determine how much NaOH reacts with the ethanol in your solution. ...
January 8, 2011 by Anonymous

biology
Two students conducted experiments to study the rate of photosynthesis in Lycopersicon esculentum L. Experiment 1 The students designed an apparatus that measures the rate of water absorption. Experiment 2 The students used a setup that measures oxygen uptake from the ...
April 5, 2010 by Anonymous

math
I've been asked to practice writing statistical questions about different topics by conducting a survey or experiment. I understand how to write them by conductin a survery but having trouble understanding what is meant by experiment. For instance of of the topics is "music". ...
January 22, 2013 by Brandi

6th grade math
My son has this homework and I am all confused... the paper says to think back to the experiment you just designed to test the Best Wheels Bike Shop's new super titanium wheel bearings. He did not do this experiment which leads me to believe this is just a statement for the ...
January 9, 2012 by m

chem
he literature value for the melting point of aspirin is 135°C. Suppose that a sample of aspirin prepared in Experiment 41 melts over the temperature range 125–128°C. What does this result suggest about the purity of this sample of aspirin?
May 10, 2011 by maribel

Psychology
To establish a cause and effect relationship, which should be used? Naturalistic observation An experiment A survey A test A case study Wouldn't you need to conduct an experiment..?
November 1, 2012 by yal

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