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Physics
My Lord: think of the spattering Hg going all over the room. Yes, it is a toxic substance. HeatgainedbyHg+Heatgainedby water+heatinSteam=0 3.94kg*specheatHg)(100-248)+.183kg*spech​eatH2O(100-83)+masswater(Hv)=0 solve for mass water, knowing the specific heats, and heat ...
Friday, February 22, 2013 at 7:25pm

chemistry
H2O is a pure substance. Sugar dissolved in water is a solution.
Thursday, February 21, 2013 at 10:52pm

chemistry
difference between solution and pure substance
Thursday, February 21, 2013 at 10:47pm

chemistry
difference between solution and pure substance
Thursday, February 21, 2013 at 10:46pm

English
This is a chemistry lab report, but I was wondering if someone could edit the grammar and look at the sentence structure, etc. I know it's really long and boring, but even if you just look over a bit of it, I would really appreciate it. And I'm assuming you don't ...
Thursday, February 21, 2013 at 6:16pm

Physics2
"The heat engine uses 1.00x10^-2 mol of a diatomic gas as the working substance. Determine the temperatures at the 3 points." From 1-2, it's an adiabatic process and the constants are (P)(V^(7/5)) or (T)(V^(2/5)). From 2-3, it's an isobaric process with V/T ...
Thursday, February 21, 2013 at 2:09am

gen. chemistry
an unknown solid substance weighs 121g. calculate the specific heat if 425.2 cal raise the temperature of the solid from 24.0 degrees C to 55.7 degrees C.
Wednesday, February 20, 2013 at 4:36pm

Chemistry (DrBob222)
Hi, here's my (almost) 2-paged lab report introduction (hopefully you remember it from yesterday). I went to class today, and actually a lot of my other classmates' introductions were over 2 pages! Now I'm feeling kind of insecure about mine, and I'm not even ...
Tuesday, February 19, 2013 at 5:39pm

chemistry
actually, the specific gravity is the ratio of the density of oil to the density of water. Since the density of water is 1g/ml, the density of a substance is numerically the same as the specific gravity. However, specific gravity is a dimensionless number, while density has ...
Tuesday, February 19, 2013 at 4:33pm

science
A 10g sample of radioactive substances is lift to decay for five half-lives. How much of the radioactive substance remains?
Tuesday, February 19, 2013 at 3:51pm

Chemistry
If I have 50 mL of Lead(II) Nitrate, it is possible for me to calculate how many mole is 1 mL of the substance? Thanks
Sunday, February 17, 2013 at 7:19pm

Physics
Calculate the net charge on a substance consisting of a combination of 7.5 multiplied by 1013 protons and 3.5 multiplied by 1013 electrons. Answer in units of C
Sunday, February 17, 2013 at 10:39am

Physics
A certain substance has a dielectric constant of 2.8 and a dielectric strength of 18.0 MV/m. If it is used as the dielectric material in a parallel-plate capacitor, what minimum area should the plates of the capacitor have to obtain a capacitance of 7.00×10-8 F and to ...
Thursday, February 14, 2013 at 9:44pm

science
when a substance is heated energy is released/ absored. in chemisty this is called an
Wednesday, February 13, 2013 at 11:01am

Chemistry
A substance of Ka of 1 x 10^–5 would be classified as a ____. A.strong acid B.weak acid C.strong base D.weak base I think it is B...?
Tuesday, February 12, 2013 at 11:02am

Urgent Chem Help
A certain substance has a heat of vaporization of 55.30 kJ/mol. At what Kelvin temperature will the vapor pressure be 3.50 times higher than it was at 361 K?
Sunday, February 10, 2013 at 8:13pm

ap chemistry
A 6.9 gram sample of a gaseous substance occupies 10 L at 63C and 537 torr. What is the density of the gas under these conditions? Answer in units of g/L
Saturday, February 9, 2013 at 7:58pm

English
1. George Bernard Shaw criticized The Importance of Being Earnest for (1 point) (0 pts) being too long. (0 pts) not being funny. (1 pt) not having real substance. 2. Choose the word below that best completes the sentence: He’s incredibly ___________; he just can’t ...
Saturday, February 9, 2013 at 4:07pm

CHEMISTRY
How do we determine whether a substance is pure in a chemical formula ?
Wednesday, February 6, 2013 at 7:25pm

7th grade health please help Ms. Sue!
1. Which substance found in tobacco is a drug that speeds up the heartbeat? (1 point) Tar Carbon monoxide Nicotine Emphysema 2. Which substance found in tobacco causes emphysema, a disease of the lungs? (1 point) Tar Carbon monoxide Nicotine Secondhand smoke 3. Which substance...
Wednesday, February 6, 2013 at 6:37pm

Chemistry
Solution of 50g AgNO3 is mixed with 50g NaCl. a) What mass of AgCl will you get? b) which substance is in redundancy?
Wednesday, February 6, 2013 at 3:21pm

Chemistry
A mole of a pure substance contains 6.02x10^23 atoms. Alway true, sometime true or never true? -I was thinking sometime true since a pure substance can be like H2O but H2O have 3 "atoms" (Is this what you call individual part of H2O?). Each "atoms" have 6....
Tuesday, February 5, 2013 at 6:32pm

physics
Calulate the amount of substance in 120g of trioxocarbonate (iv)ion,co2
Sunday, February 3, 2013 at 11:10am

physics
Calulate the amount of substance io 120g of trioxocarbonate (iv)ion,co2
Sunday, February 3, 2013 at 11:10am

Physics
The speed depends on the refractive index of the substance n n=c/v 1. vacuum: c=3•10⁸ m/s 2. air n= 1.000293 => v= c/n =3•10⁸ /1.000293 =2.999•10⁸ m/s 3. water n=1.333 => v= c/n =3•10⁸ /1.333 =2.25•10⁸ m/s 4. glass n...
Saturday, February 2, 2013 at 5:32pm

chem
The decomposition of sulfuryl chloride (SO2Cl2) is a first-order process. The rate constant for the decomposition at 660 K is 4.5 10-2 s-1. (a) If we begin with an initial SO2Cl2 pressure of 425 torr, what is the pressure of this substance after 74 s? what is the equation to ...
Saturday, February 2, 2013 at 3:46pm

Chemistry
For the same mass, molarity decreases with increasing molar mass. For example, suppose we weigh out 100 g. For a substance with a molar mass of 50 there are 2 mols. For a substance with a molar mass of 100 that is 1 mol. M = mol/L, therefore, the molar mass of 100 material is ...
Saturday, February 2, 2013 at 1:22am

chem
Rank the following species according to the decreasing energy needed to raise the temperature of 10.0g of the substance by 25.0 degrees celsius Rank from most to least energy needed. Rank these in order of the question. copper aluminum cast iron silver water
Friday, February 1, 2013 at 3:23pm

Organic Chemistry
You can tell if the unknown is a pure substance by the melting point range (or lack of a range). I suspect it is to determine if the thermometer is calibrated properly.
Thursday, January 31, 2013 at 8:57pm

Organic Chemistry
Why is the melting point of a known compound (ex. acetanilide) determined before the melting point of the unknown compound? I think it is to determine if the unknown is a pure substance but I am not sure..I just need to be pointed in the right direction.
Thursday, January 31, 2013 at 6:30pm

physics
(M*C*delta T)of water + (M*C*delta T) of substance = 0 90*1.0*20 + 50*C*(-55) = 0 delta T (temperature change) of water is 20 C. delta T of unknown substance = -55 C Solve for the unknown specific heat C. C = 90*20/(50*55) = 0.654 cal/(g*C)
Wednesday, January 30, 2013 at 5:43am

physics
90 g of water at 25C mixed with 50g of another substance at 100C result in 45C what is specific heat of that substance
Tuesday, January 29, 2013 at 9:57pm

science
Would you expect a substance to be a solid, liquid, or gas at absolute zero? Explain your answer.
Tuesday, January 29, 2013 at 6:39pm

Science
An unknown substance has a volume of 25 mL. It is placed into a different container and its volume changes to 50 mL. What happened? Is it a change in state?
Tuesday, January 29, 2013 at 6:21pm

finance
describe the difference between the substance and form of financial statements and give an example of each
Tuesday, January 29, 2013 at 4:34pm

Chemistry
The term mole is used in chemistry to define an amount of a substance. For example, a mole of glucose, blood sugar, weighs 180.16 grams. A common concentration unit for solutions is moles of substance per liter of solution. We abbreviate this with the symbol M. For example, 0....
Monday, January 28, 2013 at 9:11am

Calculus
The half life of a certain radioactive substance is 10 years. How long will it take for 18 gms of the substance to decay to 6 gms? A. 6 ln 10 years B. 10 ln 6 years C. 10 (ln 3)/(ln 6) years D. 18 ln 10 years E. 10 (ln 3)/(ln 2) years
Sunday, January 27, 2013 at 4:36pm

chemistry
what is the equillibrium constant of each of the substance in the equillibrium when concentration of ICl was 0.75M 2ICl(g)=I2+Cl2 kc=o.12
Saturday, January 26, 2013 at 1:00am

dress making
1. Which one of the following is the most complete and accurate definition of fiber? A. A stringy substance from plants B. The hair of an animal C. Man-made threads and yarns D. Basic raw material from which fabric is made 2. An example of a natural fiber is A. nylon. B. ...
Friday, January 25, 2013 at 5:09pm

math
assume the substance has a half-life of 11 years and the initial amount is 126 grams.How long will it be until only 15 % remains?
Friday, January 25, 2013 at 11:43am

Math
assume the substance has a half-life of 11 years and the initial amount is 126 grams. How much remains at the end of 8 years?
Friday, January 25, 2013 at 11:23am

Physics
Light is incident from water onto a flat transparent slab of material, at an angle of 48.8° with the normal. The reflected ray and the refracted ray are perpendicular to each other. What is the index of refraction of the transparent substance?
Thursday, January 24, 2013 at 9:49pm

precal
If the half-life of a certain radioactive substance is 2000 years, estimate how many years must elapse before only 35% of the radioactive substance remains?
Tuesday, January 22, 2013 at 10:15pm

chemistry
You're right. I disagree but the practical aspects are right. 3*37/0.500 = 222 mL is the total volume you want. In practice, that is ABOUT 222-37 = ABOUT 185 mL. In theory, however, that assumes that 185 mL + 37 mL = 222 mL but volumes are not additive unless we are adding...
Monday, January 21, 2013 at 11:34pm

Chemistry
he question representing the production of tetraphosphorus trisulfide (P4S3), a substance used in some match hears, is 8P4 + 3S8 ---> 8P4S3. Determine if each of the following statements is correct. If the statement is incorrect, rewrite it to make it correct. a. To produce...
Tuesday, January 15, 2013 at 11:35pm

chem
Where's the arrow? How do you know where the reactants stop and products start without an arrow? I changes from zero to +5. the right. Cl changes from zero to -1. Oxidation is the loss of electrons. Reduction is the gain of electrons. The substance oxidized is the reducing...
Tuesday, January 15, 2013 at 3:24pm

English
1. George Bernard Shaw criticized The Importance of Being Earnest for A.)being too long. B.)not being funny. C.)not having real substance. 2. Choose the word below that best completes the sentence: He’s incredibly ___________; he just can’t make up his mind about ...
Monday, January 14, 2013 at 2:02pm

chem-answer check please
Compounds like CCl2F2 are known as chlorofluorocarbons, or CFCs. These compounds were once widely used as refrigerants but are now being replaced by compounds that are believed to be less harmful to the environment. The heat of vaporization of CCl2F2 is 289 J/g. What mass of ...
Thursday, January 10, 2013 at 4:41pm

Please CHECK thanks
Please check and tell me what I got wrong and let me know the correct answer for the problem. Thanks. 1. Diarrhea can be caused by a change in diet and different minerals in the water. True (yes) False 2. Fusion produces less radioactivity than fission. True False (yes) 3. ...
Wednesday, January 9, 2013 at 6:31pm

chemistry
Compounds like CCl2F2 are known as chlorofluorocarbons, or CFCs. These compounds were once widely used as refrigerants but are now being replaced by compounds that are believed to be less harmful to the environment. The heat of vaporization of CCl2F2 is 289 J/g. What mass of ...
Wednesday, January 9, 2013 at 5:23pm

chem
thanks! also what does a compound have to have to have dipole-dipole and also dispersion forces Identify the type or types of intermolecular forces present in each substance. hydrogen peroxide, HOOH i put dispersion forces and hydrogen bonding. but its wrong. is it also dipole...
Wednesday, January 9, 2013 at 5:01pm

Somebody check this plz..and thanks.
Please check and tell me what I got wrong and let me know the correct answer for the problem. Thanks. 1. Diarrhea can be caused by a change in diet and different minerals in the water. True (yes) False 2. Fusion produces less radioactivity than fission. True False (yes) 3. ...
Wednesday, January 9, 2013 at 4:23pm

Will somebody help me please?
1. Diarrhea can be caused by a change in diet and different minerals in the water. True False 2. Fusion produces less radioactivity than fission. True False 3. Wise travelers eat only cooked vegetables in underdeveloped areas. True False 4. The kilogram is the basic unit of ...
Tuesday, January 8, 2013 at 10:37am

I need help..
1. Diarrhea can be caused by a change in diet and different minerals in the water. True False 2. Fusion produces less radioactivity than fission. True False 3. Wise travelers eat only cooked vegetables in underdeveloped areas. True False 4. The kilogram is the basic unit of ...
Monday, January 7, 2013 at 4:48pm

Please guys. Help me out.
1. Diarrhea can be caused by a change in diet and different minerals in the water. True False 2. Fusion produces less radioactivity than fission. True False 3. Wise travelers eat only cooked vegetables in underdeveloped areas. True False 4. The kilogram is the basic unit of ...
Monday, January 7, 2013 at 1:34pm

Science Somebody Help Me Please..I have a deadline
1. Diarrhea can be caused by a change in diet and different minerals in the water. True False 2. Fusion produces less radioactivity than fission. True False 3. Wise travelers eat only cooked vegetables in underdeveloped areas. True False 4. The kilogram is the basic unit of ...
Monday, January 7, 2013 at 1:23pm

physics
the volume of 50g of a substance is 20 cm^2 if the density of water is 1 g cm^-1 will the object floats or sinks in water.???
Sunday, January 6, 2013 at 11:23am

Chemistry
A volume of 10cm^3 of 2M H2SO4 is placed in a volumetric flas of 250cm^3 and filled to the mark with distilled water. What is the molar conc. of the H2So4 in the flask? After I found how many moles there are in 10cm^3, which is 0.02 mol, what is my next step, as because the ...
Sunday, December 30, 2012 at 3:36pm

chemistry
Homologous means a mixture of same substance.e g Iodide crystals
Wednesday, December 26, 2012 at 1:49pm

chemistry
Only pure substance are homologous,true or false? Can you please explain too?
Tuesday, December 25, 2012 at 1:36pm

English
Some sticky substances are yucky things. All taffy is a sticky substance. Therefore, some taffy is a yucky thing Is this a valid syllogism
Thursday, December 20, 2012 at 1:34pm

physics
Q = m*C*(Tf-Ti) where Q is the heat, m is the mass of the substance, C is the specific heat, Tf is the final temperature; Ti is the initial temperature. deltaQ = 0 or 5*C(Tf - 10) + 1*C*(Tf - 40) = 0 divide by C: 5*(Tf-10) + (Tf-40) = 0 Solve for Tf.
Tuesday, December 18, 2012 at 4:15pm

chemistry
Given that the pH of a substance is 1.0, what is the [H+]? A. 0.0 mol/L B. .1 mol/L C. 2.4 mol/L D. 7.5 mol/L B
Monday, December 17, 2012 at 2:21pm

chemistry *Poorly defined commonly used question
"Why are active on-duty firefighters likely to experience the adverse health effects from inhaling 300 ppm of carbon monoxide faster than nonactive off-duty firefighters who inhale the same concentration of the same substance? Explain your answer using the chemicals/...
Sunday, December 16, 2012 at 5:20pm

Math
In 10 years, 25% of a radioactive substance decays. What is its half-life? A. 25 years B. 24 years C. 20 years D. 29 years
Friday, December 14, 2012 at 2:34pm

Algebra
In 10 years, 25% of a radioactive substance decays. What is its half-life? A. 25 years B. 24 years C. 20 years D. 29 years
Wednesday, December 12, 2012 at 6:54pm

chemistry
hey guys need some help here!!! if 0.250mol of CO and 0.250mol of H2O were combined in a 125mL flask and the reaction allowed to reach equilibrium . Kc= 1.56. write the equ expression and calculate each substance Co(g) +H2O(g) .... Co2(g) +H2(g)
Tuesday, December 11, 2012 at 6:18pm

Science- Chemistry
Determine the type of bonding in each substance. a. Zinc, Zn (s) b. Propane, C3H8 (l) c. Calcium Carbonate, CaCO3 (s)
Tuesday, December 11, 2012 at 9:16am

Physics
I'm also stumped by this one: 3. A bimetallic strip (117 cm by 1 cm by 0.01cm) has aluminum (a = 23x10^-6 1/Celsius) on one side and has steel (a= 12x10^-6 1/Celsius) on the other. It is perfectly straight at room temperature (20 celsius). What change in temperature is ...
Tuesday, December 11, 2012 at 12:24am

Chemistry
please explain how % error and % yield would have effected the mass/moles of a substance in a reaction in a lab. In this case mass/moles of NaCl. NaHCO3+ HCl--> NaCl + CO2 + H2O
Monday, December 10, 2012 at 10:51pm

Chemistry
The figure below is a heat curve for an unknown outerspace substance discovered by the Mars rover. By understanding the heat curve, scientists can make inferences about the composition of the planet. What is the temperature of fusion, Tfusion, and vaporization, Tvapor, for ...
Sunday, December 9, 2012 at 6:20pm

Physics
index of refraction = c/v=λ(vac)/λ(substance) λ(water) =λ(air)/n=650 nm/1.33=489 nm. This is the wavelength of violet light The swimmer sees the red-orange color since our eyes detect the frequency of the light
Saturday, December 8, 2012 at 2:36pm

Chemistry
Write a balance equation for the reaction of nitric acid (HNO3) with each base solution : [1]. NaHCO3, [2]. MgCO3. ( Please include the phases of the substance)
Saturday, December 8, 2012 at 9:20am

English - ms. sue
Ms. Sue, my sister write out story here it is. On Monday she looked in her mailbox, although she had no reason to expect a letter so soon. But there it was, a small, square car. She held it in her two hands, testing its weight. It was an invitation to an exhibition of drawings...
Thursday, December 6, 2012 at 8:46pm

pharmaceutical chemistry
when is a substance classified as pharmaceutical aid or necessity?PLEASE HELP ME :)THANKS A LOT.
Thursday, December 6, 2012 at 7:00am

Chemistry (kinetics)
None of the orders in this reaction were 0 order; however, reactions can be 0 order. Using the idea of a reaction mechanism and rate limiting step, explain how a reaction can be 0 order for a substance.
Wednesday, December 5, 2012 at 9:44pm

Science
A radioactive substance is found to register 1000 counts per second on a Geiger counter. Twenty-four hours later it registers 125 counts per second. What is its half-life?
Wednesday, December 5, 2012 at 9:09pm

Chem
upon cumbustion of a 0.144g sample of Mg, 0.090g of O2 is used. Though the sample likly contains impurites (substance other than Mg). What is the percent of imputities by mass?, please show the steps I'm really confused with this one. Thank you
Wednesday, December 5, 2012 at 5:43pm

Science
If a 20 gram sample of a radioactive substance has a half-life of 6000 years, how many grams would be present after 18000 years?
Wednesday, December 5, 2012 at 4:21pm

Physical Science- Help Please!
Suppose that you are given a 100 gram sample of a radioactive substance with a half-life of 32 days. How many grams will be left after 192 days?
Wednesday, December 5, 2012 at 4:13pm

chemistry
upon cumbustion of a 0.144g sample of Mg, 0.090g of O2 is used. Though the sample likly contains impurites (substance other than Mg). What is the percent of imputities by mass?, please show the steps I'm really confused with this one. Thank you
Wednesday, December 5, 2012 at 10:03am

college chemistry
what is the specific heat of a substance that required 800 joules of heat to raise the temperature of 50 grams of it from 20 degrees Celsius to 30 degrees Celsius?
Tuesday, December 4, 2012 at 11:13pm

Science
Which property can be used to help identify an unknown substance? Specific Heat combustion temperature Tyndall effect
Tuesday, December 4, 2012 at 12:21pm

ap chem
A calorimeter contains 20.0 of water at 12.5 . When 2.20 of (a substance with a molar mass of 59.0 ) is added, it dissolves via the reaction and the temperature of the solution increases to 27.5 . Calculate the enthalpy change, , for this reaction per mole of . Assume that the...
Monday, December 3, 2012 at 3:38pm

ap chemistry
A calorimeter contains 20.0 of water at 12.5 . When 2.20 of (a substance with a molar mass of 59.0 ) is added, it dissolves via the reaction and the temperature of the solution increases to 27.5 . Calculate the enthalpy change, , for this reaction per mole of . Assume that the...
Monday, December 3, 2012 at 2:11pm

ap calculus
suppose that the amount in grams of a radioactive substance present at time t (in years) is given by A (t) = 160e-.70t. Find the rate of decay of the quantity present at the time when t = 4
Sunday, December 2, 2012 at 9:07pm

Chemistry
a) The fastest diffuser is the loest molar mass substance. b) urms = sqrt(3RT/M) M is molar mass. R is 8.314. T in kelvin.
Saturday, December 1, 2012 at 12:02am

20 question please check my answers
1. A sickness resulting from eating food that is not safe to eat empty-calorie foods nutrition foodborne illness nutrient density 2. A nutrient that helps control the amount of fluid in your body sodium calorie protein nutrition 3. A measure of nutrient content relative to ...
Friday, November 30, 2012 at 2:34pm

CHEMISTRY
0.0325 WHAT molar and WHAT substance?
Wednesday, November 28, 2012 at 11:36pm

Physics
Heat Movement Thermal energy is always moving. No matter what substance is heated, there is always another place for the heat to move, unless all available substances are the same temperature and equilibrium is reached. This is particularly true on earth, where thermal energy ...
Tuesday, November 27, 2012 at 8:18pm

English and Grammar
first draft of my report and i need help in improving this. i didnt made up all the information here all comes from a book. Dissociative identity disorder is defined in the DSM-IV-TR as the presence of two or more personality identities that repeatedly take control of one’...
Friday, November 23, 2012 at 12:27pm

How do I calculate the number of atoms in a compou
I have the mass of the amount of substance, and the molar masses. How do I do this? Is this the same as calculating the number of molecules/ formula units? Also, I know the number of atoms for each element in the compound (It made me calculate that before)
Monday, November 19, 2012 at 11:48pm

chemistry
How do I calculate the number of atoms in a compound (not an element)? I have the mass of the amount of substance, and the molar masses. How do I do this? Is this the same as calculating the number of molecules/ formula units? Also, I know the number of atoms for each element ...
Monday, November 19, 2012 at 11:44pm

physics
Calculate the net charge on a substance consisting of a combination of 8.9 × 10 13 protons and 2.6×10 13 electrons. The elemental charge is 1.6 × 10 −19 C. Answer in units of C
Sunday, November 18, 2012 at 1:43pm

health help me
1. Starches and sugars that provide energy (1 point)kidneys enzymes carbohydrates vitamins 2. The system that removes waste from the body and controls the body's water levels (1 point)excretory digestive system liver kidneys 3. Organs that remove waste material, including ...
Saturday, November 17, 2012 at 9:23pm

chemisrty
When a substance changes from one phase to another, which of the following occurs? the substance loses or gains heat the average kenetic energy of the substance changes the temperature of a substance changes the molecular motion of a substance changes
Friday, November 16, 2012 at 11:14am

Chemistry
The question representing the production of tetraphosphorus trisulfide (P4S3), a substance used in some match hears, is 8P4 + 3S8 ---> 8P4S3. Determine if each of the following statements is correct. If the statement is incorrect, rewrite it to make it correct. a. To ...
Wednesday, November 14, 2012 at 11:05pm

science
what is a form of energy that is always transferred from a warmer substance to a cooler one?
Wednesday, November 14, 2012 at 8:31pm

Pre-calculus
On a chicken farm, the poultry is given a healthy diet to gain weight. The chickens have to consure a minimum of 15 units of substance A and another 15 units of substance B. In the market there are only two classes of compounds: Type 1, with a compoistion of one unit of A to ...
Monday, November 12, 2012 at 1:00pm

chemistry
Which of the following is generally defined as a substance composed of molecules in which two or more nonmetallic elements are joined? A. Binary compound B. Ionic compound C. Molecular compound D. Ternary compound I think A
Saturday, November 10, 2012 at 6:40pm

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