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October 25, 2014

Search: how many bromine molecules Br2 have a mass equal to 31.8g

Number of results: 87,704

Chemistry
What type of chemical reaction is involved in the breakdown of large molecules, such as those found in food,into smaller molecules? i think it might be Catabolism, but im not sure
October 2, 2011 by jess

Chemistry
2. Olive oil is almost pure triolein (a molecule). The molar mass of triolein is 885 g/mol. How many olive oil molecules have you got in 500g of olive oil?
May 3, 2010 by Jimbo

Chemistry of Life
Which statement is true about water molecules? The oxygen atom has a negative charge. The hydrogen atoms do not share electrons. Water molecules move randomly around each other. Water molecules cannot dissolve many substances. Question 2. How does water relate to the ability ...
September 26, 2014 by Sara

chemistry
a. What is the molecular weight of aspirin (C9H8O4)? 180.1574 amu b. What is the mass of 0.00785 mol of aspirin? 1.41 g c. How many moles of aspirin are present in 100 mg of aspirin? Enter your answer in scientific notation. 5E-4 mol aspirin d. How many molecules of aspirin ...
February 11, 2012 by krystal

chemistry
a hydrated salt is a solid that includes water molecules within its crystal structure. a student heated a 9.10-gram sample of a hydrated salt to a constant mass of 5.41 grams. what percent by mass of water did the salt contain?
November 28, 2010 by Hank

CHEMISTRY
The mass of an erlenmeyer flask is 78.639g and the mass of the flask and water is 327.039. If the density of water is 1 g/ml then what is the true volume of the flask? so i had subtracted the mass of just the flask from the mass of the flask and the water and got 248.4. Would ...
March 28, 2014 by Sandy

chemistry
*The Nernst Equation and pH* Sulfuric acid is a very strong acid that can act as an oxidizing agent at high concentrations (low pH). Under standard conditions, sulfuric acid has a low reduction potential, SO4^2-(aq) + 4H^+(aq) + 2e^- <=> SO2(g) + 2H2O(l),.....+0.20V ...
March 31, 2010 by Sarah

Chemistry
A mixture of BaCl2.2H2O (FM244.26) and K2SO4 (FM 174.26) is heated at 160C for an hour, causing the water molecules to leave. A sample originally weighing 2.0027 g weighed 1.9021 g after heating. Calculate the mass percent K2SO4 in the sample. In a previous practice example, I...
September 28, 2011 by Asuna

Physics
two cars of equal mass with equal speeds traveling perpendicular to one another collide completely in elastically. what percentage of the cars' total energy is lost in the collision?
February 25, 2014 by ritzi

math
A 4 ft spring measures 8 ft long after a mass weighing 8 pounds is attached to it. the medium through which the mass moves offers a damping force numerically equal to sqrt.2 times the instantaneous velocity. Find the equation of motion if the mass is initially released from ...
February 26, 2012 by pam

math
if you have a 4 kg block and divide it into 8 equal blocks. what will be the mass of each block in grams?
April 11, 2013 by nico

chemistry
which of the molecules listed below can form hydrogen bond? For wich of the molecules would dispersion forces be the only intermolecular force? Give reasons for answer. A.H2 B.NH3 C.HCl D.HF
December 1, 2011 by selene

chemistry
which of the molecules listed below can form hydrogen bond? For wich of the molecules would dispersion forces be the only intermolecular force? Give reasons for answer. A.H2 B.NH3 C.HCl D.HF
December 1, 2011 by selene

science
a car of mass 100 kg traveling at 72 km/hr is brought to rest by applying the brakes.assuming that the kinetic energy of the car becomes transferred to internal energy in four steel brakes drum of equal mass, fine the rise in temperature of the drums if the total is 20kg, the ...
May 8, 2013 by ing-marie

math
State the null hypothesis, Ho, and the alternative hypothesis, Ha, that would be used to test the following statements. (a) The linear correlation coefficient is positive. Ho: ń ---Select--- not equal to equal to greater than less than 0 Ha: ń ---Select--- not equal to equal ...
May 30, 2013 by Sue 12

chemistry
you have a block of ice that weighs 500g. how many CO2 molecules do you have?
September 22, 2009 by jo

Chemistry
Ranking equilibrium constants from largest to smallest according to an image?Ethene (C2H4) can be halogenated by the following reaction: C2H4 (g) + X2 (g) -><- C2H4X2 (g) where X2 can be Cl2 (green), Br2 (brown), or I2 (purple). Examine the three figures below ...
February 8, 2012 by L.Bianchessi

chemistry
If we have 0.128 grams of copper (ll) sukfate how many molecules do we have?
February 22, 2011 by Bryce

complete and balnces theses reactions
how do i complete and balnces theses reactions???? CH3-CH2-CH3 (g) + Br2 (l) --> like how in the world????? do i do this? lol aint got a clue wish i would have listened at school now. Alkanes usually react with a halogen to form one of several halides. The simplest reaction...
June 13, 2006 by bobby

Physics
"Relative" is an important word. Block L of mass mL = 1.90 kg and block R of mass mR = 0.500 kg are held in place with a compressed spring between them. When the blocks are released, the spring sends them sliding across a frictionless floor. (The spring has negligible mass and...
February 25, 2007 by COFFEE

chem
How many atoms are there in the following problems? which one has the most number of atoms? a. 5 molecuels (NH4)2S b. 9 molecules H2O2 c. 11 molecules O3
October 30, 2012 by chemdummy

chem
How many atoms are there in the following problems? which one has the most number of atoms? a. 5 molecuels (NH4)2S b. 9 molecules H2O2 c. 11 molecules O3
October 30, 2012 by chenchen

Managerial Econ
How do you get P=12.4-4Qd to equal P=-2.6+2Qs? You have to find the equalibrium so you have to set Qd=Qs so I can't figure out how to get p in the equations and the equations to equal Qd & Qs.
September 5, 2007 by Rachel

Help me please with physics
A 25kg mass is on a level, rough surface where the force of friction is a constant 15 N. A horizontal applied force of 65 N acts on the mass. The mass is initially at rest. a) what speed does the mass have after 4.0 seconds? b) what speed does the mass have after being moved 2...
October 15, 2010 by Nicole

biology
which of these would lead to an increase in carbon dioxide in the atmosphere a- decrease in animal respiration b- decrease in plant respiration c- an increase in photosynthesis d- an increase in auto and factory emissions 2. which activity occurs during the process of ...
December 23, 2013 by anonymous

AP Chemistry
The buoyant force on a balloon is equal to the mass of air it displaces. The gravitational force on the balloon is equal to the sum of the masses of the balloon, the gas it contains, and the balloonist. If the balloon and balloonist together weight 175 kg, what would the ...
October 11, 2010 by Emma

CHemistry....Please help
What mass of ethylene glycol C2H6O2, the main component of antifreeze, must be added to 10.0 L water to produce a solution for use in a car's radiator that freezes at -23C? Assume density for water is exactly 1g/mL. ----------------------------------- This is what i have so ...
January 22, 2009 by Saira

Science
Lithium atoms, like hydrogen atoms, have only a single electron in their outer shells, yet lithium atoms do not join together to form Li2 molecules the way hydrogen atoms form H2 molecules. Instead, lithium is a metal with each atom part of a crystal structure. Can you think ...
October 22, 2011 by Sheryl

Chemistry
In this equilibrium H2(g) + I2(g) <-> 2 HI(g). What is happening on the molecular level? Like given the right energy when a H2 molecule hits a I2, is electron transfered and they just stick together? Or do they have to be in the right position? Who transfers (or is it ...
April 5, 2011 by Sarah

Physics
A ball of mass m makes a head-on elastic collison with a second ball (at rest) and rebounds in the opposite direction with a speed equal to 1/4 it's original speed. What is the mass of the second ball? I would really apprieciate it if ya'll would show steps. I have been ...
November 9, 2012 by Henry

Chemistry
Calculate what mass of carbon disulfide molecules contains the same number of sulfur atoms as 100.0 g of sodium sulfate.
November 10, 2009 by Michael

Chemistry
If I count out Avogadro's number if CO2 molecules how much will my piles of molecules weigh? Can someone show me how to get the answer. I know the answer is 44g
September 4, 2014 by Sarah

math geometry ITT
so i know that when you have an isosceles triangle has 2 equal sides, and the 2 angles created by those sides are also equal . if a question gives me the angle at the top ( which is 40 degrees ), how do i find the 2 equal angles at the bottom ?
January 10, 2011 by amanda

physical science
There are two set pieces in a theater sitting on platforms with wheels. One is a tree with a mass of 50 kg. It is moving at 3 m/s. The other is a fence with a mass of 30 kg. If the two set pieces have equal momentum, how fast is the fence moving
June 28, 2011 by norma

Physical Science
The physical properties of ice are different from the physical properties of dry ice (frozen carbon dioxide). But the physical properties of gaseous water vapor and the physical properties of gaseous carbon dioxide are the same. Why? A.) The valence electrons are more tightly ...
October 17, 2011 by Anonymous

physics
There are two set pieces in a theater sitting on platforms with wheels. One is a tree with a mass of 50 kg. It is moving at 3 m/s. The other is a fence with a mass of 30 kg. If the two set pieces have equal momentum, how fast is the fence moving?
April 22, 2010 by kl

Science
There are two set pieces in a theater sitting on platforms with wheels. One is a tree with a mass of 50 kg. It is moving at 3 m/s. The other is a fence with a mass of 30 kg. If the two set pieces have equal momentum, how fast is the fence moving? A. 3 m/s B. 5 m/s C. 30 m/s D...
July 14, 2014 by Alyssa

phi
Which of the following does Peter Singer assert about the principle of equality? (Points : 1) People should have equal rights because they are factually equal. People with higher abilities, it stands to reason, should have greater rights. Different groups of humans should ...
July 20, 2014 by jason

chemistry
Calculate the volume of 0.05 kg of bromine. (D=3.12 g/ml)
September 22, 2011 by Anonymous

chemistry
Calculate the volume of 0.05 kg of bromine. (D=3.12 g/ml)
September 22, 2011 by teddy

elements and compounds
iron and bromine
April 16, 2012 by Tess

Physics
I have to make up my own standardized questions for a project, and I wanted to make sure I did my math right. Can someone please check it? Thanks!! If your mass was 60 kg, the earth’s mass was 6×10^24 kg, the radius of the earth was 6.4×10^6 meters, and the universal ...
April 13, 2008 by Emily

science/chemistry
The van der waals equation incorperates corrections for the ideal gas laws in order to account for the properties of real gases. one of the corrections accounts for 1:The kinetic energy being inversly proportional to the temperature 2:The possibility of chemical reactions ...
May 10, 2010 by Puzzled

Chemistry
Consider the equation: A + 4B=3C+3D, when equal masses of A and B are reacted, which is limiting? My possible answers are: A)if the molar mass of A is less than the molar mass of B, then B must be limiting. B) If the molar mass of A is greater than the molar mass of B, then A ...
March 21, 2012 by Jessica

Business Math
Using the simplex method, solve the following linear programming problem: Maximize: P= 5x+2y Subject to: 4x+3y < or equal to 30 2x-3y < or equal to 6 x > or equal to 0, y > or equal to 0.
December 9, 2012 by Colleen

Chem
I have a question on a post lab that asks what would happen if you mix potassium bromide and Br2 (aq)? Wouldn't the answer be nothing, since yiu are just adding more of one of the elements to the conpound?
November 18, 2013 by Stacy

College Physics
The rms speed of the molecules in 1.7 g of hydrogen gas is 1700 m/s. What is the total translational kinetic energy of the gas molecules? What is the thermal energy of the gas? 500 J of work are done to compress the gas while, in the same process, 1700 J of heat energy are ...
April 26, 2010 by Helly

STATISTICS
The area under a normal curve distribution is Equal to 100 almost equal to 1 equal to 1 equal to .5
June 3, 2010 by Jake

The Calvin Cycle
How many molecules of CO2 will the calvin cycle consume in generating 2 molecules of fructose 6-phosphate? How many molecules of ATP will the calvin cycle consume in generating 2 molecules of fructose 6-phosphate? How many molecules of NADH will the calvin cycle consume in ...
November 20, 2011 by Jenna

physics
Which of the following is correct for the nuclear fission reaction? Choose one answer. a. The mass of the daughter nucleus is always greater than the mass of the parent nucleus. b. The mass of the daughter nucleus is always less than the mass of the parent nucleus. c. The mass...
April 28, 2011 by ashley --

chemistry
In any chemical reaction, the quantities that are preserved are what? A. the number of moles and the volumes B. the number of molecules and the volumes C. mass and number of atoms D. mass and moles
January 8, 2010 by Joe

Chemistry (Check)
Part B True-False Classify each of the statements as always true, sometimes true, or never true. 1.____ST______ one mole of any gas occupies a volume of 22.4 L. 2_____NT______ for a substance of known molar mass, the number of moles of a sample can be calculated from the mass ...
February 5, 2007 by Bryan

Chemistry
Each of four identical tires of a car is filled with a different gas. Gas pressure in each tire is 3.0 atm at 25oC. One tire contains neon, another – argon, the 3rd one has krypton, and the last one has unknown gas. How many molecules are there in each tire? So far, I have ...
November 12, 2008 by Jordan

chemistry
1) You have 300 g of H2O how many molecules do you have?
February 6, 2011 by Anonymous

chemistry
1) You have 300 g of H2O how many molecules do you have?
February 6, 2011 by Anonymous

chemistry
If you have 156g of SO2, how many molecules do you have?
July 10, 2013 by Erin

chemistry
from the balanced equation 4NH3 +7O2 - 4NO2 + 6H2O How many molecules of water are produced when 2.25 moles of ammonia are completely reacted? The equation tells us that 4 mol NH3 will produce 6 mols water. That means 2 mols NH3 will produce 3 mols water. How did we do that? 2...
March 18, 2007 by jessica

Chemistry
4Fe + 3O2 = 2Fe2O3 So in math book it say " You can interpret this equation in terms of representative particles by saying that four atoms of iron react with three molecules of oxygen to produce two formula unit of iron(iii) oxide" Why it say that there are 4 atoms of iron / 3...
February 24, 2013 by Shadow

Chemistry
In a gaseous system at equilibrium with its surroundings, as molecules of A(g) collide with molecules of B(g) without reacting, the total energy of the gaseious system 1. decreases 2. increases 3. remains the same
April 13, 2009 by A

chemistry
consider the following substances Fe(s); O2(g); H2o(l). which of the following is the corrrect order to show decreasing attractions between irons atoms, oxygen molecules, and water molecules?
July 21, 2010 by alicia scott

science
Most proteins (do or don't) pass through the plasma membrane? Explain? Substances that dissolve in (lipids or water) can more readily pass across the plasma membrane. Explain Ions can cross the plasma membrane more easily if they have the (same or opposite) charge as the ...
September 18, 2011 by kj

chem
How does molar mass affect the boiling point of covalent substances? The general rule is that heavier molecules boil at a higher temperature. thanks
April 9, 2007 by Lydia

Physics
A binary star system consists of two equal mass stars that revolve in circular orbits about their center of mass. The period of the motion, T=29.6 days, and the orbital speed v= 220 km/s of the stars can be measured from telescopic observations. What is the mass (kg) of each ...
July 12, 2011 by Casey

Science check my answers
Which step in the nitrogen cycle is accelerated at the beginning of the eutrophication process? denitrification*** nitrogen fixation producer uptake of nitrogen consumer decomposition Which of the following is carried out by denitrifying bacteria? break down large, nitrogen-...
March 13, 2014 by anonymous

Physics
True or false?equal masses of two different gases placed in containers of equal volume at equal temperature must exert equal pressures
January 21, 2013 by John

Chemistry
Question 1. A Compound Containing 3 Atoms Of Carbon & 8 Atoms Of Hydrogen Is Combined In A Reaction With Oxygen Molecules. The 2 End Products Of This Equation Are Carbon Dioxide &water. What Element Should You Look At 1st In Balancing This Equation? Choose a.b.c or d? A. ...
July 8, 2008 by Mickeyv

Chemistry
Question 1. A Compound Containing 3 Atoms Of Carbon & 8 Atoms Of Hydrogen Is Combined In A Reaction With Oxygen Molecules. The 2 End Products Of This Equation Are Carbon Dioxide &water. What Element Should You Look At 1st In Balancing This Equation? Choose a.b.c or d? A. ...
September 23, 2008 by Jen

Chemistry
So I did a lab that consist of baking cookies and the mass of the final products isn't equal to the ingredients used. Could there be mass lost as gas ? What other factors might there be? Thanks
May 26, 2013 by Shadow

chemistry
Question 1. A Compound Containing 3 Atoms Of Carbon & 8 Atoms Of Hydrogen Is Combined In A Reaction With Oxygen Molecules. The 2 End Products Of This Equation Are Carbon Dioxide &water. What Element Should You Look At 1st In Balancing This Equation? Choose a.b.c or d? A. ...
September 23, 2008 by Jen

Chemistry
I have no clue as to how this problem should be solved... could i have some help please? Calculate the rms speed of SF6 molecules at 16°C
May 17, 2009 by Lydia

Physics (Spring force constant)
Please help me i cant figure out what goes in the blanks and this is the last question of my gizmo... THANKS! If the spring constant is 100 N/m, the period is equal to the _____________ _____________ of the mass multiplied by _____________. If the mass is held constant at 1.0 ...
May 1, 2012 by James

Chemistry
What is the chemical symbol for bromine vapour?
November 3, 2010 by Leah

chemistry
will potassium chloride react with bromine
July 11, 2011 by chan

physics
You have a mass m hanging on a string of length L. You pull the mass to one side so that the string makes an angle theta with the vertical, then you let go of the mass. For the instant after you let go, how do you calculate the tension in the string? I came up with the ...
April 7, 2009 by kayla

SCIENCE:BIOLOGY>
1. How many seconds do you spend in school during the week (6.5 hours/day)? 2. How many micrograms are in 12 dekagrams? 3. How many centimeters are in 5 kilometers? 4. 3.25 liters are equal to how many kiloliters? 5. how man meters are in 0.65 hectometers? 6. How many grams ...
September 3, 2014 by Julia

help with stochiometry
can someone help me out with this one? balanced equation is: 2H2 + O2 > 2H2O My questions are: How many molecules of water are produced from 2.0 * 10 ^23 molecules of oxygen? How many moles of water are produced from 22.5 moles of oxygen? OK. First, it depends on if you ...
January 24, 2007 by iearn

Chemistry
How can you increase the concentration of the product (s) in each of these reactions by varying the temperature and pressure (caused by volume change)? 4NH3 + 5O2 <=> 4NO + H2O Delta H = -903.75 kJ Br2 + Cl <=> 2BrCl Delta H = 14.64 kJ Please help... With gaseous ...
May 2, 2007 by Linda

Molecular formula
I have to find the molecular formula for As2O3, to do so I have to divide its molecular mass by its empirical mass. I have worked ou that its molecular mass is 197.9 g/mol. How would I find its empirical mass, is it not the same as its molecular mass? Many thanks I have 197.84...
January 20, 2007 by Mac

biochemistry
please explain how to get these answers (answers provided): 1. If this cell were a muscle cell (myocyte), how many molecules of actin could it hold? (Assume the cell is spherical and no other cellular components are present; actin molecules are spherical, with a diameter of 3....
January 16, 2008 by stew

Mitochondria
Assume Cell 1 produces 1.0 x 105 ATP molecules while Cell 2 produces 1.0 x 108 ATP molecules. Which mitochondria, A or B, has the hardware to produce 1.0 x 108 ATP molecules? What told you this?
December 4, 2007 by May

Algebra
I have a problem, which requires I solve the following system of linear inequality graphically. my textbook is vague and does not provide online examples or instruction to assist me withinfo to work the problem. Please help? Thank you. 3x - y is lessor than or equal to 6 x is ...
January 24, 2008 by Carl

Physics
A hydraulic lift has two connected pistons with cross-sectional areas 25 cm2 and 390 cm2. It is filled with oil of density 530 kg/m3. a) What mass must be placed on the small piston to support a car of mass 1500 kg at equal fluid levels? kg HELP: The pressure is constant at ...
November 6, 2010 by Kimbo

Chemistry
For each of the four pairs of compounds, which would you expect to have the higher melting point based on the operative bonding mechanism? NaCl and KBr HF and CF4 CF4 and CHI3 H2 and Br2 Pls try and help me :( xX
November 18, 2012 by Anonymous

chemistry
I need some help with afew questions that I have and I have to go to bed soon for school tomorrow. how are molecules and polyatomic ions similar?
May 5, 2008 by Chelsea

Science
Using the law of conservation of matter, explain why there is no “away” when dealing with the issue of pollution. Any chemical reaction yields a product mass equal to the reactant mass.
February 9, 2007 by Christy

Chemistry
Diarsenic trioxide is the number one source of arsenic; determine the mass of a sample of this extremely poisonous material containing 4.03x10^18 molecules.
September 29, 2013 by Tired

Biology - photosynthesis
1. In measuring the amount of ATP and NADPH consumed by the Calvin cycle, you find 30,000 molecules of ATP consumed but only 20,000 molecules of NADPH. WHere did the extra ATP molecules come from? A) Chlorophyll B) photosystem II C) cyclic electron flow D) noncyclic electron ...
November 17, 2007 by J

Physics
B)In physics (and in all science) standard units are used to ensure measurement uniformity. Which of the following fictitious units of measurement could not be considered a standard unit? 1) The grimph: a distance unit equal to exactly 4 meters. 2) The nicket: a time unit ...
September 1, 2012 by Zhady

chemistry
Ca + Br2 --> CaBr2 its synthesis and the reason the reaction happens is stable electron configuration but i dont understand why. Responses chemistry - DrBob222, Wednesday, January 21, 2009 at 10:06pm Synthesis because it's two elements combining to form a single product. ...
January 21, 2009 by lyne

chem
the molar mass of NaCl is 58.45g. How many molecules does a gram of NaCl contain?
October 4, 2014 by bekah

CHEM
How many molecules of ammonia are produced from: 2.58x10^-4g of Hydrogen? My balanced equation: 3H2 + N2 = 2NH3 I worked this question as: mol of H = 2.58x10^-4g/1.00794g/mol= 2.559676x10^-4 mol mol of NH3 produced = 2x2.559676x10^-4mol/3mol NH3 = 1.706450701x10^-4 Molecules...
October 15, 2007 by K

biology
Food that is consumed often enters the body in the form of large organic molecules, such as proteins and starches. Prior to entering cells, however, these large molecules must be broken down into smaller molecules. For example, proteins are digested into _______ prior to ...
March 21, 2012 by Monique

Chemistry
Does mass affect pressure? I understand volume, and temperature does but not sure about mass. If I have a gas with mass 15 g, wont this exert less pressure than a gas have a mass of 30 g?
April 1, 2013 by Shadow

physics
A block of mass 7.33 kg in outerspace is moving at 1.72 m/s with no external forces acting on it. After an explosion, the block is split into two parts both having mass equal to half the mass of the original block. The explosion supplies the two masses with an additional 16.7 ...
October 18, 2009 by Anonymous

physics
If two particles have equal kinetic energies, are their momenta necessarily equal?
November 8, 2007 by Anonymous

algebra help bad!!!!
Solve 2x+9 greater or equal to 5 and 2x-13greater or equal to 9 what is the solution? I have x=-2 and x=2 how do I write this {x x> what?
September 22, 2011 by Allison

science
two equal forces have their resultant equal to either.what is the inclination between them?
June 28, 2012 by nt531

Math
Please help! 1.3-2.5x<or equal to -1.2x-0.52 The answer is x>or equal to 1.3 I have been on this for hours and can't figure it out Thank you
February 14, 2014 by Cherie

physics
A small sphere of mass m = 7.50 g and charge q1 = 32.0 nC is attached to the end of a string and hangs vertically as shown in the figure. A second charge of equal mass and charge q2 = –58.0 nC is located a distance d = 2.00 cm below the first charge. (a) Find the tension in ...
November 6, 2012 by renee

Chemistry
Which of the following contributes to the bubbling from a cold can of soda when left standing at room temperature. Choose all that apply. 1) the initial rush of CO2 out of the can drags other CO2 molecules out of the solution. 2) the decrease in CO2 partial pressure lowers the...
February 12, 2012 by Hannah

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