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February 7, 2016

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

Number of results: 99,689

PHYSICS
At what height above the ground must a body of mass 10kg be situated inorder to have potential energy equal in value to the kinetic energy possessed by another body of mass 10kg moving with a velocity of 10m/s?
January 30, 2016 by Anonymous

Chemistry
Which of the following reagents would oxidize Cr to Cr2 , but not Fe to Fe3 ? Ca Co Ca2+ Br2 Co2+ Br- Which of the following reagents would oxidize Cu to Cu2 , but not Cl to Cl2? Br2 Ca Co2+ Co Br- Ca2+
March 29, 2013 by Anon

Chemistry
Balloon- CO2 Balloon- O2 Balloon- He Balloon- N2 Balloon- CH4 Represented above are five identical balloons, each filled to the same volume at 25 degrees Celcius and 1.0 atmosohere pressure with the pure gases indicated. A) which balloon contains the greatest mass of gas? ...
October 22, 2006 by Tina

Chemistry
Part 1: Each molecule of NO2, nitrogen dioxide, consists of 1 atom of N and 2 atoms of O. If you have 0.155 g. of NO2, how many molecules of NO2 do you have ? 0.155gx46.0 = moles moles x 6.02 E23 = answer Part 1 Answer: 2030000000000000000000 Part 2: How many atoms of N do you...
June 14, 2011 by Summer

PHYSICAL SCIENCE
IN A BALANCED CHEMICAL EQUATION,THE MASS OF THE REACTANTS IS EQUAL TO A.ATOMS IN A MOLECULE B.ATOMIC MASS OF THE ELEMENTS C.VOLUME OF THE PRODUCTS D.MASS OF THE PRODUCTS
January 14, 2008 by KRYSTAL

physical science
in a balanced chemical equation the mass of the reactants is equal to the? a. atoms in a molecule b. atomic mass of the elements c. volume of the reactants d. mass of the products
March 25, 2011 by sarah

Chemistry. PLEASE HELP
If we believed that the molecules of a gas move around fairly rapidly, we can use this to explain all of the following EXCEPT why adding more gas increases the pressure. why most of the volume of the gas sample is taken up by the gas molecules. why the gas molecules do not ...
November 5, 2013 by Anonymous

chemistry
In a chemical reaction, exactly 2 mol of substance A react to produce exactly 3 mol of substance B. How many molecules of substance B are produced when 26.5 g of substance A reacts? The molar mass of substance A is 21.9 g/mol. Step 1: Convert the mass of A to moles. Step 2: ...
September 24, 2013 by bb

chemistry
What is the molar mass of salenH(2) and nickel(II) salen? I don't know shat salen is? Do you have a formula? Salen is a contraction for salicylic aldehyde and ethylene diamine which are the reactants for the basic ligand. There are a number of these so you will need find out ...
April 17, 2007 by Bob

physics
A newly-discovered plant, "Cosmo", has a mass that is 4 times the mass of the Earth. The radius of the Earth is Re. The gravitational field strength at the surface of Cosmo is equal to that at the surface of the Earth if the radius of Cosmo is equal to... I guess I need some ...
January 19, 2008 by Hannah

High School chem 1
2Fe(OH)3 + 3H2SO4 -> Fe2(SO4)3 + 6H2) Question: How many molecules of H2O can be made from 9.21 x 10^22 molecules of H2SO4?
March 1, 2011 by tyler

chem 1
Using equation: 2Fe(OH)3 + 3H2SO4 -> Fe2(SO4)3 + 6H2O Question: How many molecules of H2O can be made from 9.21 x 10^22 molecules of H2SO4?
March 1, 2011 by tyler

physics! help!
For incomplete cancellation to occur, opposite pulses must have A. equal amplitudes B. different energies C. equal pulses D. equal displacements is it B??
April 4, 2009 by sophie

Chemistry
Express each quantity as a mass in grams. a) 3.70mol of H2O b) 8.43 x 10^23 molecules of PbO2
October 20, 2007 by Marty

chemistry
A sugar crystal contains approximately 1.710^17 sucrose (C12H22O11) molecules What is its mass in mg?
September 19, 2010 by Mely

chemistry
A sugar crystal contains approximately 1.710^17 sucrose (C12H22O11) molecules What is its mass in mg?
September 20, 2010 by Mely

chemistry
2.15 g of a substance X contain 4.34 x 1022 molecules of X. Calculate the molar mass of X in g/mol.
November 16, 2014 by michelle

AP Bio
Lymphocytes capable of reacting against "self" molecules A. are usually not a problem until a woman's second pregnancy B. are usually destroyed before birth C. are usually kept separate from the immune system D. contribute to immunodeficiency diseases E. are characterized by ...
March 19, 2008 by Mary

Physics
19. Two people of unequal mass are initially standing still on the ice with negligible friction. They then simultaneously push each other horizontally. Afterward, which of the following is true? * -The center of mass of the two person system moves in the direction of the less ...
January 26, 2015 by Lexie

physics
Coulomb's Law do two charges have to be equal for any given force. Question: do equal angles necessarily imply that the charges on the 2 are equal, explain.
July 7, 2011 by Sarah (C)

Physics
A runner weighs 560 N (about 130 lb), and 74% of this weight is water. (a) How many moles of water are in the runner's body? moles (b) How many water molecules (H2O) are there? molecules I dont' unstand what to do here. I know have to fine mole per h2o
April 19, 2008 by James

Physics
A 156 g hockey puck is attached to a rubber band and rotated with an angular speed of 9.2 rad/s on frictionless horizontal ice. It takes a force of 1.22 N to stretch the rubber band by 1 cm. -------------------------------------------------------------------------------- (a) ...
December 3, 2010 by Susan

physics
A planet A of mass m is in a circular orbit of radius "a" around a star ( M_star >> m ). Another planet B with the same mass m is in an elliptical orbit around the same star with its length of the semi-major axis equal to "a" . We have just learned that, in this case, ...
November 15, 2013 by ashok

biology
POLARITY COHESION SURFACE TENSION CAPILLARY ACTION UNIVERSAL SOLVENT ADHESION match definitions Because water molecules stick together, they form a thin film on the surface of pools of water, on which some organisms can walk Water molecules are able to move against the force ...
November 20, 2013 by anonymous

12th grade chemistry
How many molecules of water can be made from 9.21 x 10^22 molecules of hydrogen sulfate? The equation is 2Fe(OH)3 + 3H2SO4 -> Fe2(SO4)3 + 6H2O
March 2, 2011 by TJ

Chemistry
Could somebody please explain why in gaseous reaction the collision frequency between molecules is far greater than the rate at which molecules react? Thanks! :)
April 20, 2013 by Matt

SCIENCE
This assignment is dealing with the electromagnetic spectrum. I have some questions to ask you. 1. Which waves can be used to SEE molecules? 2. Why can't you use visible light to SEE molecules? 3. Some insects like bees can SEE light of shorter wavelengths than humans can see...
November 23, 2009 by Hayley

Physics please HELP
A planet A of mass m is in a circular orbit of radius "a" around a star ( M_star >> m ). Another planet B with the same mass m is in an elliptical orbit around the same star with its length of the semi-major axis equal to "a" . We have just learned that, in this case, ...
November 15, 2013 by ashok

Aditya
Br2(l)+Cl2(g) (double arrow) 2BrCl(g) dH=+29.4 kJ/mol I am having trouble understanding this. Will the system shift left, right, or unchanged and why? a.Increasing Temp. b. Increasing pressure in flask by adding Ar. c. Increasing volume of flask d. Adding Br2(l)...is answer ...
February 12, 2014 by Chemistry

Chemistry
Br2(l)+Cl2(g) (double arrow) 2BrCl(g) dH=+29.4 kJ/mol I am having trouble understanding this. Will the system shift left, right, or unchanged and why? a.Increasing Temp. b. Increasing pressure in flask by adding Ar. c. Increasing volume of flask d. Adding Br2(l)...is answer ...
February 12, 2014 by Aditya

CHEMISTRY
Predict the products of the following reactions. a)CH3-CH2-CH2-CH3+O2----> B)CH3-CH2-CH2-CH2-CH3+Br2----> c)CH3-CH=CH-CH3+Br3----> D) HEXENE+KMnO4--> E) HEXENE+Br2---->
February 19, 2012 by April

science
1.) Any object having a very large mass would necessarily have a very large weight. true or false? False 2.)For a freely falling object, A) the total distance covered doesn't change. B) the velocity doesn't change. C) the acceleration doesn't change. D) the speed doesn't ...
May 8, 2007 by mike

physics ( disregard last post)
hey bob, this question average force of friction thanks a lot. i only don't get one part. Now, set the potential energy of the rubber band (stretched x cm) equal to the work done on friction. does it matter how much i stretch it and what does it mean when "You can measure k ...
June 12, 2007 by James

Chemistry
One of the flavouring compounds that have been isolated from aniseed oil is anethole. a.What is the configuration of the molecule, cis or trans? b. The compound will react with bromine. i.What would you observe? ii.Write an equation for the reaction.
December 19, 2012 by Sarah

Physics Classical Mechanics
The figure below shows the experimental setup to study the collision between two carts. In the experiment cart A rolls to the right on the level track, away from the motion sensor at the left end of the track. Cart B is initially at rest. The mass of cart A is equal to the ...
October 28, 2013 by Anonymous

statistics
the correlation between two random variables X and Y is p=-0.75.it is given that X=1,2or3 with equal probability of 1/3 and Y=-1,-2or-3 with equal probability of 1/3.the covariance is equal to?i need help.i have been struggling to get the answer>
February 11, 2011 by Joel

chemistry
What is the formula mass, in amu, of KNaC4H4O64H2O? Be sure to include the water molecules
February 25, 2010 by joey

Chemistry
The following reaction has Kp = 109 at 25C. 2 NO(g) + Br2(g) 2 NOBr(g) If the equilibrium partial pressure of Br2 is 0.0159 atm and the equilibrium partial pressure of NOBr is 0.0768 atm, calculate the partial pressure of NO at equilibrium.
January 8, 2012 by Ferdinand

AP Chem
The following reaction has Kp = 109 at 25C. 2 NO(g) + Br2(g) 2 NOBr(g) If the equilibrium partial pressure of Br2 is 0.0159 atm and the equilibrium partial pressure of NOBr is 0.0768 atm, calculate the partial pressure of NO at equilibrium.
January 8, 2012 by Bill

Chemistry
Based on the balanced equation, C2H4 + 3O2 → 2CO2 + 2H2O calculate the molecules of H2O formed when 135 molecules of O2 are reacted.
November 7, 2010 by Marissa

chemistry
how many molecules of O2 are in 5.0g of O2? how many atoms of oxygen are in this many molecules?
December 6, 2011 by milan

chemistry
Which of the following rate laws suggests that the reaction probably occurs in a single step? why is this problem cant be answer a since it has order of 1 a)(CH3)3CBr + OH- →(CH3)3COH + Br- rate = k[(CH3)3CBr] b)NO(g) + O2(g) → NO2(g) + O(g) rate = k[NO][O2] c)H2O2...
May 17, 2010 by eng

chemistry
Which of the following rate laws suggests that the reaction probably occurs in a single step? why is this problem cant be answer a since it has order of 1 a)(CH3)3CBr + OH- →(CH3)3COH + Br- rate = k[(CH3)3CBr] b)NO(g) + O2(g) → NO2(g) + O(g) rate = k[NO][O2] c)H2O2...
May 18, 2010 by eng

Math
1) When will the dependent variable in the equation y=√x+4-3 equal or exceed to 4? A) x > or equal to -0.17 B) x > or equal to 45 C) x > or equal to 48 D) x > or equal to 53 2) The function t=√d/16 models the time (t) in seconds that an object has been ...
April 7, 2015 by Tia

Calculus III
Find the moment of inertia about a diameter of s spherical shell of uniform density, D, bounded by two concentric spheres of radii a and b, where a<b. Express your answer in terms of a, b and the mass of the spherical shell. So far I have found my equation for row (p), and ...
August 4, 2014 by E

physics
Identical forces act for the same length of time on two different masses. The change in momentum of the smaller mass is A) smaller than the change in momentum of the larger mass, but not zero. B) larger than the change in momentum of the larger mass. C) zero. D) equal to the ...
December 2, 2006 by tyler

Chemistry- Organic Reactions
Can anyone help me with this question: I have to show how I would synthesize the molecules: hexanol, bromo-2-pentene, and ethoxypropane by using the starting matierials: -benzene -bromocyclopropane -butanoic acid -chlorine gas -cyclohexane -ethanol -ethanal -heptanol -2-hexene...
January 31, 2007 by Michelle

chemistry
what would be a diagram that we can use to idenitify an unknown substance using electrochemical data. we have a reduction table and ksp values and we also that the substance is either bromine or iodine
January 9, 2011 by chemistry

physics
one liter (1000cm3) of oil is spiled onto a smooth lake. if the oil spreads out uniformly until it makes an oil slick justone molecure thick, with adjcent molecules just touching estimate the diameter of the oil slick. Assume the oil molecules have a diameter of 2X10-10 m.
August 21, 2012 by kels

chemistry
1.what is the volume of NaCl in cubic cm and cubic nm if the Length is 0.563 nm? 2. the density of NaCl is 2.17 g/cm. What is the Mass? 3. Each repeating unit is composed of 4 NaCl molecules. What is the Mass of 1 NaCl molecule?
August 20, 2011 by andi

chemistry
which of the molecules listed below can form hydrogen bonds? for which of the molecules would dispersion forces be the only intermolecular force? give reasons for you answers.
April 27, 2010 by sam

high school chem 1 (stoichemestry)
using equation: 2Fe(OH)3 + 3H2SO4 -> Fe2(SO4)3 + 6H2O question: How many Molecules of H2O can be made from 9.21 x 10^22 molecules of H2SO4?
March 2, 2011 by TJ

Science
1. Which statement about subatomic particles is NOT true? (1 point) Protons and neutrons have almost the same mass. Protons and electrons have opposite charges. Unlike protons and electrons, neutrons have no charge. Protons and neutrons have the same charge. 2. Which of the ...
October 10, 2008 by Chelsea

Chemistry
Which of the following rate laws suggests that the reaction probably occurs in a single step? NO(g) + O2(g) → NO2(g) + O(g) rate = k[NO][O2] H2O2 + 3 I- + 2 H+→ I3- + 2 H2O rate= kl[H2O2][I-]+K2[H2O2][I-][H+] H2(g) + Br2(g) → 2 HBr(g) rate = k[H2][Br2]1/2 (...
May 16, 2011 by dude

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)
November 19, 2012 by pinkmercy

science
When particles are equally distrubited, diffusion will? A- continue B- Go in reverse C- Stop D- become permeable YOu mean equally distributed throughout the medium? The molecules continue to move in all directions (A), but the concentration changes have stopped (C). I like A ...
May 2, 2007 by chris

chem 130
what mass of sodium hydroxide will be required to neutralize completely 1.60x10^23 molecules of HCl?
November 17, 2015 by Heather

chemistry help
Determine the number of moles of each specified atom or ion in the given samples of the following compunds.( Hint: the formula tells you how many atoms or ions are in each molecule of formula unit.) a. O atom in 3.161x10^21 molecules of CO2 b. C atom in 3.161x10^21 molecules ...
March 8, 2009 by jaz

Statistics
a city law-enforcement official has stated that 20% of the items sold by pawn shops within the city have been stole. Ralph has just purchased 4 items from one of the city's pawn shops. Assuming that the official is correct, and for x = the number of ralph's purchases that have...
October 24, 2012 by Kiesh

Chemistry (Check)
Which of the following exhibits the highest boiling point? a. Ne, Ar, Kr, or Xe? Xe b. HF, HCl, HBr, or HI? HI c. CH3CH3, CH3COOH, or CH3OCH3? CH3COOH d. F2, Cl2, Br2, or I2? I2 e. NaCl, SO2, or N2? SO2 Are these right? I just went by molar mass. If these are wrong, please ...
December 6, 2015 by Anonymous

Re: Pig question (Physics)
Thank you, I think I get it now. I have one more question: a kimchi container of mass 1=3.0 kg connected to a block of mass m2 by a cord looped around a frictionless pulley. The cord and pulley have negligible mass. When the container is released from rest, it accelerates at 1...
October 12, 2006 by Amber

Math (inequalities)
1)Each packet must have at least 20 gold stars = x > or equal to 20 2)Each packet must have at least 15 silver stars = y > or equal to 15, is this correct? 3)The total number of stars in each packet must not be more than 60 = x+y < or equal to 60, is this correct? 4)x...
July 1, 2009 by Keira

Physics Class 11th
I have read about Translatory Motion it says "It is that motion in hwich body, which is not a point mass body is moving such that all its constituent particles move simultaneously along parallel straight lines and shift through equal distance in a given interval of time.. My ...
August 6, 2009 by Akashdeep

Algebra 1 Scientific Notation
Isaac newtons theory of universal gravitation states that the equation F=G m^1m^2/r^2 can be used to calculate the amount of gravitational forces in newtons between 2 point masses (m^1) and (m^2) separated by a distance (r). G is a constant equal to 6.67*10^-11 m^2 kg^-2. The ...
September 26, 2011 by Austin

chemistry - ozone
hi, can anybody tell me the molecules that destroy ozone? i need a fair few molecules to write in my homework...thanks! The main species responsible for destroying ozone in the stratosphere is Cl atoms. Br atoms are also very effective but there aren't many around. Collisions ...
June 26, 2006 by harshini

Chemistry
A student places 0.025 moles of solid sulfur and 0.100 moles of nitrogen monoxide gas in a closed 1.00L container and 0c for several days. Calculate the number of molecules of NO in the 1.00L container after equilibrium is reached, given the following thermodynamic data. I ...
December 1, 2014 by nns40760

Science last question
Which of the following boxes would have the strongest gravitational pull on a third object positioned at an equal distance from both boxes? Box A: 100 g Box B: 10,000 g A. box b because it has more mass B. box a because it has less mass C. box a because it is bigger*** D. box ...
April 16, 2015 by Anne

Math
A commercial refrigerator unit accidentally releases 12.5 L of ammonia gas at SATP. Determine the mass and number of molecules of ammonia gas released. Please if possible show the steps because I have an exam in an hour and I was trying this question and Im clueless. Please ...
June 21, 2013 by Kristen

chemistry
90.92% of the atoms have a mass of 19.988 u, 0.26% of the atoms have a mass of 20.983 u and 8.82% of atoms have a mass of 21.978 u. Calculate the average atomic mass of this element
May 6, 2011 by susan

Organic CHEM
I read on the textbook a sentence like this: "The melting and boiling points of alkanes increase as their molecular sizes increase. This is because as alkane molecules become bigger, the attractive forces between the alkane molecules become stronger." Please tell me if my ...
October 21, 2009 by Marrion

SCIENCE 1
the van der waals equation incorperates coreections for the ideal gas law in order to account for the properties of real gases. one of the corrections accounts for A.the average kinetic energy being inversely proportional to temperature B. the possibility of chemical reaction ...
May 11, 2010 by Dave

Chemistry
If 3.79x1024 formula units (molecules) of hematite react with excess carbon, what mass of iron will be produced?
January 7, 2015 by Brooke

science
2. Olive oil is almost pure triolein (a molecule). The molar mass of triolein is 885 g/mol. How many moles of olive oil molecules have you got in 500g of olive oil?
September 26, 2011 by Marianne

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

chem
based on the balanced eq: c6h12+9O2->6CO2+6H2O calculate the molecules of CO2 formed when 174 molecules of H20 form. im not exactly sure how to start this problem.
May 16, 2008 by rudy

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 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
*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. 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
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

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

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

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

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
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

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
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

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

calc
a lamina in the xy plane is bounded by y=0,x=0 and 2x + y=2 has mass density at (x,y) equal to the distance to the x-axis. find the mass of the lamina. the part that is tripping me up is the mass density
December 15, 2014 by sam

math
lamina in the xy plane is bounded by y=0,x=0 and 2x + y=2 has mass density at (x,y) equal to the distance to the x-axis. find the mass of the lamina. the part that is tripping me up is the mass density
December 15, 2014 by sam

chemistry cp
The term formula mass is a general term that can be applied to both ionic compounds and molecular compounds because (a) ionic compounds exist as individual molecules (b) molecular formulas are always empirical formulas (c) not all formulas represent individual molecules (d) ...
April 7, 2015 by sally

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: ---Select--- not equal to equal to greater than less than 0 Ha: ---Select--- not equal to equal ...
May 30, 2013 by Sue 12

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

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

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