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December 21, 2014

Search: How many oxygen atoms are in 2.90g of quartz?

Number of results: 5,662

7th grade science Ms. Sue please
2. The smallest unit of life is the _____. (1 point) cell homeostasis organism protein 3. The nucleus is the largest of the _____. (1 point) chloroplasts mitochondria organelles ribosomes 6. Which is not found in animal cells? (1 point) central vacuole cytoskeleton rough ...
December 6, 2012 by Delilah

science
which is the correct balanced equation for a given titration process, (a) or (b)? a) 6H+ + 2MnO4- + 3H2O2 -> 4O2 + 2Mn2+ + 6H2O b) 6H+ + 2MnO4- + 5H2O2 -> 5O2 + 2Mn2+ + 8H2O Process: Make a solution in a 100mL volumetric flask using 1g of NaBO3*4H2O, 20mL of 1M H2SO4, ...
March 30, 2011 by sarah

Check! Bio!
Since photosystem II occurs before photosystem I, why are they not named in reverse? My answer: Historically photosystem I was named one since it was discovered before photosystem II but this does not represent the order of the electron flow. Also, some bacteria that produce ...
July 25, 2006 by barbie!

Chem
The atomic numbers and masses must added up on both sides of the equation just as we must have the same number of atoms on each side of an equation when it is balanced. Ejection of a "thing" with 2 protons and 2 nuetrons is a He nucleus which is an alpha particle. 88Ra226 ==&...
February 5, 2007 by DrBob222

Help now please, Chemistry
How many grams of oxygen can be produced by heating 10.0g of mercury (II) oxide? Sulfuric acid is added to 8.10g of magnesium, how many grams of hydrogen are set free? I'll do the first. You do the second by following the first as a guide. 1. Write the balanced equation. 2HgO...
March 5, 2007 by Beautiful

Help me! pls...
what are the physical properties and chemical properties of ammonium cyanate? Go to www.chemfinder.com and search this chemical. It is Urea. Read here: http://www.3rd1000.com/urea/urea.htm Urea and ammonium cyanate are isomers. In the solid state,they have differing crystaline...
August 28, 2005 by Danielle Stacey

Chemistry
I am still not understanding this one at all. Draw the structure of the reaction product of 2-methyl-1pentene with H2 in the presence of platinum catalyst. This is the exact question it does not say cis or trans. I didn't follow DrBob222's reply, but I thought I had missed a ...
April 3, 2007 by Kellie

Chemistry
Molar volume of an ideal gas at S.A.T.P. (25oC and 1.00 bar is 24.8 dm3 mol-1. Assume that gases are at 225oC and P=1.00 atmosphere before and after the combustion and behave as ideal gases. The chemical equation for the combustion of butane is: 2C4H10(g) + 13O2(g) → ...
February 10, 2012 by JRMM

Science
A______________________ is a tool used to capture the energy in sunlight. Recycling aluminum cans and taking shorter showers are two ways to practice the ________________________ of natural resources. Some plastics are made from corn. These plastics are biodegradable. This ...
April 1, 2014 by Anonymous

Science help!!!!
A______________________ is a tool used to capture the energy in sunlight. Recycling aluminum cans and taking shorter showers are two ways to practice the ________________________ of natural resources. Some plastics are made from corn. These plastics are biodegradable. This ...
April 12, 2014 by Anonymous

chemistry
For these problem, I know how to solve it, but I have some issues with the formula. I know that, I need to write down the formula first, and then I need to balance the equation, then I can solve it. So, can anyone please check my formula? You don't have to solve the problem ...
September 10, 2009 by hh

Chemistry; Stoichiometry
Consider the reaction 2Al + 3CuSO4 = Al2(SO4)3 + 3Cu What is the maximum amount of Cu (63.5 g/mol) that could be produced by reacting 20.0 grams of Al (27.0 g/mol) with excess CuSO4? 1. 70.6 g 2. 57.2 g 3. 129 g 4. 31.4 g Consider the reaction 4As + 3O2 = 2 As 2O3 What is the ...
May 6, 2010 by Annalie

Biology
CAM (crassulacean acid metabolism) plants such as the cacti differ from standard C4 plants such as corn in which of the following ways? a. CAM plants minimize photorespiration whereas C4 plants do not. b. CAM plants use both mesophyll and bundle sheath leaf cells for ...
October 6, 2009 by John Joseph

science
2. Which of the following is responsible for carrying nutrients to and waste from the bodyís cells? (1 point) plasma red blood cells red and white blood cells white blood cells 3. _________ defend the body against disease. (1 point) Fibrin Red blood cells Plasma White blood ...
January 23, 2013 by tesj

Chemistry
Question One: Comment on the solubility of hydrogen ( H2 ) in liquid ammonia ( NH3 ). State whether you expect hydrogen to be highly soluble or almost insoluble, and explain why. i)Highly soluble due to hydrogen bonding. ii)Highly soluble due to compatible nature of bonds. iii...
December 11, 2012 by Odesa

chemistry - decomposition of water(help)
Hydrogen is a very appealing fuel, in part because burning it produces only non-polluting water. One of the challenges that researchers face in making hydrogen fuel a reality is how to produce hydrogen economically. Researchers are investigating methods of producing hydrogen ...
March 3, 2011 by Farah

chemistry - decomposition of water(help)
Hydrogen is a very appealing fuel, in part because burning it produces only non-polluting water. One of the challenges that researchers face in making hydrogen fuel a reality is how to produce hydrogen economically. Researchers are investigating methods of producing hydrogen ...
March 3, 2011 by Farah

HELP PLSS SCIENCE
2. Which of the following is responsible for carrying nutrients to and waste from the bodyís cells? (1 point) plasma red blood cells red and white blood cells white blood cells 3. _________ defend the body against disease. (1 point) Fibrin Red blood cells Plasma White blood ...
January 23, 2013 by tesj

Chemistry
1. Calculate the number of molecules in a deep breath of air whose volume is 2.15 L at body temperature, 36 degrees Celsius, and a pressure of 740 torr. 2.A fixed quantity of gas at 24 degrees Celsius exhibits a pressure of 740 torr and occupies a volume of 4.42 L. a)Use Boyle...
November 2, 2009 by Emory

Physics help
The galaxies in the universe are all flying away from each other. The speeds of nearby galaxies are proportional to the distance the galaxy is away from us. This relation, v=Hd is known as Hubble's law and the constant H is known as Hubble's constant. The evolution of our ...
May 23, 2013 by SOmebody

Chemistry
4 super tough chemistry questions: 1.) Water has a considerably higher boiling point and lower vapor pressure than other molecules of similar or larger molar mass. For example, dinitrogen (N2), methane (CH4), etc. all have lower boiling points and higher vapor pressures than ...
January 21, 2010 by .

Sciece
Hi Can I have websites that have quizes and tests for Science cause my checkpoint exams are coming and I want specifically in Biology , Chemistry , Physics The topics th at I want are Cells , Atoms elements compounds and mixtures and Energy and Energy resouces thanx I searched...
April 8, 2007 by Hi

physics
please check these: Which interaction of nature binds atoms and molecules by attracting unlike charges and repulsing like charges? a. strong b. weak c. electromagnetic d. gravitational i got A, but someone said C , so i just want to make sure How is a motor's mechanical energy...
March 14, 2009 by physics

biology
Hemoglobin is a critical oxygen-carrying protein. The protein functions as a tetramer with two α-globin subunits and two β-globin subunits. Individuals homozygous for a specific single point mutation in the region that encodes the sixth amino acid in β-globin ...
May 2, 2013 by Anonymous

CHEMISTRY MORE
Posted by Kim on Tuesday, October 31, 2006 at 8:11pm. I am COMPLETELY LOST for this one...dnt even know where to start MOLES 1) Lithium Hydroxide reacts with Carbon Dioxide to form solid Lithium Carbonate and Water. How many grams of carbon dioxide can be absorbed by each 1 ...
November 1, 2006 by kim

Science help!?
. If a kestrel eats a mouse that eats grass, the kestrel is a (1 point)producer. second-level consumer. first-level consumer. decomposer. 2. Which of the following best explains why a species of lizard is able to live in the desert but not in tundra regions? (1 point)High ...
April 11, 2014 by Anonymous

CHEMISTRY
Given assumed valencies: H=1, N=3, & C=4 i am now required to draw the structural formulae of HYDROGEN CYANIDE and CYANOGEN. H:C:::N is the Lewis electron dot structure. If you want to use "sticks" as a bond instead of two electrons, one stick stands for two electrons. H-...
February 7, 2007 by MARK

Chemistry
How would you synthesize each of the following? a. 1,2-dibromopropane from propene b. acetone (2-propanone) from an alcohol c. tert-butyl alcohol (2 methyl-2-propanol)from an alkene d. propanoic acid from an alcohol How would you synthesize the following esters? a. n-...
January 5, 2007 by cathleen

stoichiometrics
What is the mass of each and which is greater? 1g H2 + ?N2 and 1g H2 + ?O2 I've balanced them to this point: 3H2 + N2 ===> 2NH3 2H2 + O2 ===> 2H2O Help please, I am stuck on this step and cannot get any further. Thanks, PJ Good! You've done the hard part. For the first ...
October 22, 2006 by Penny

chemistry
Question: When a pink aqueous solution of potassium permanganate, faintly acidified with dilute sulfuric acid was treated with 10% aq. hydrogen peroxide, the reaction took place with the evolution of gas bubbles, and the pink solution was turned colorless. Further chemical ...
May 5, 2011 by Shadow

Environmental Science
29. A common feature of thermal pollution and artificial eutrophication is that they both a. have sources that are difficult to identify and control b. cause large mats of algae to bloom in fresh water c. are a result of power plants and other industrial activity d. decrease ...
January 27, 2010 by y912f

Chemistry-Formal Charge
I have a test tomorrow and I don't really understand how to do formal charge and I've been looking at it and it just isn't clicking. Thank you for your help. Count the electrons around the atom. If the electron(s) is/are shared with another atom, half goes to one atom and half...
November 21, 2006 by Katy

CHEM
1. How many moles of water can be made from 4 moles of oxygen gas and 16 moles of hydrogen gas? What is the limiting reagent? 2. Calculate the mass of water produced from the reaction of 24.0 g of H2 and 160.0 g of O2. What is the limiting reagent? 3. The burning of 18.0 g of...
June 1, 2008 by Anonymous

Chemistry
I am really confused about polar and non polar molecules. I really don't understand how to know if something is polar or not. Or about bond polarity vs. molecular polarity (net dipole moment). Also, if it has a lone pair when you draw a lewis structure does this automatically ...
April 27, 2007 by Gabriela

chemistry
Hello, a few questions: Thanks so much! 1. The heat capacities of titanium and water are 0.522 J g-1 K-1 and 4.184 J g-1 K-1, respectively. What is the final temperature of the titanium-water mixture if a 175.0-g sample of titanium, initially at 90.0oC, is added to 50.0 g of ...
March 1, 2014 by abby

Chemistry - Energy and Change rev (help+check)
so i was revising for a test next week, and i had problems with the below designing question, so could someone please help me out. 54. The caloric content (energy content) of foods is measured using a bomb calorimeter. A sample of food is burned in oxygen, O2, inside the ...
March 23, 2011 by Babelii

Chemistry
1. Which of the following metals is oxidized by calcium ions? *potassium zinc iron lead 2. The first electrochemical cell was invented by ____. Michael Faraday *Alessandro Volta James Maxwell Benjamin Franklin 3. Why can't a lead storage battery be recharged indefinitely? A ...
March 28, 2013 by Jack

chem 3A
please help me with these homework problems from chemistry because the teacher did not give enough information to some of these chemistry work problems. 1) 50.0 g of aluminum is reacted with excess sulfuric acid. The chemical equation for the reaction is: 2Al + 3H2SO4 --> ...
July 25, 2008 by shylo

Chemistry
Nitric oxide (NO) reacts with molecular oxygen as follows: 2NO(g) + O2(g) Ā® 2NO2(g) Initially NO and O2 are separated as shown below. When the valve is opened, the reaction quickly goes to completion. Determine what gases remain at the end of the reaction and calculate their ...
October 31, 2010 by Sarah

chem
Can somebody help me please??? Ozone, O3 has a O-O-O connectivity. 1. Draw a lewis structure for ozone 2. Calculate the formal charge for each oxygen of ozone 3. Describe the shape of ozone http://coolspace.gsfc.nasa.gov/hawaii/lessons/introducing_ozone1.htm http://dbhs.wvusd....
September 1, 2005 by Nisar

science
Please help me with this question.... The isotope caesium-137, which has a half-life of 30 years, is a product of nuclear power plants. How long will it take for the amount of this isotope in a sample of caesium to decay to one-sixteenth of its original amount? k = 0.693/t1/2...
February 5, 2007 by Mary

Biology
19. Which is NOT a general characteristic of plants? a. use oxygen to make usable energy b. primary producers c. have specialized cells d. cell walls composed of cellulose I think it might be either A or B... 20. Which of the following are characteristics of all animals? a. ...
February 18, 2010 by mysterychicken

Biology
19. Which is NOT a general characteristic of plants? a. use oxygen to make usable energy b. primary producers c. have specialized cells d. cell walls composed of cellulose I think it might be either A or B... 20. Which of the following are characteristics of all animals? a. ...
February 19, 2010 by mysterychicken

Environmental Science
are these correct? 29. A common feature of thermal pollution and artificial eutrophication is that they both a. ave sources that are idfficult to identify and control b. cause large mats of algae to bloom in fresh water c. are a result of power plants and other industrial ...
February 1, 2010 by y912f

Chemistry
Can someone please check my work? Which of the four factors affecting reaction rate is most important in each exampel below? Choose from among concentration, temperature, surface area, and catalyst. a. Extra dish soap is added to help cut the grease when washing a frying pan...
March 4, 2010 by John

Chemistry - Bob Pursley
Posted by Sarah H on Friday, May 23, 2008 at 8:10pm. Hi, please check my work: In an experiment, 23.4 g of FES are added to excess oxygen and 16.5 g of FE2O3 are produced. The balanced equation is: 4FeS = 7O2 --> 2Fe2O3 + 2SO2 Calculate the % yield. My Answer: nFeS=23.4g/87...
May 24, 2008 by Sarah H

Biology
21. The difference between autotroph and heterotroph is that a. heterotrophs must get energy from sources other than the sun b. heterotrophs can use chemical or light energy sources c. heterotrophs do not obtain energy from autotrophs d. all of the above A? 25. Which of the ...
January 21, 2010 by mysterychicken

Chemistry II
C4H4 (g) + 2 H2 (g) --> C4H8 (g) Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon and hydrogen are combusted, carbon dioxide and water are the products. Using the enthalpies of combustion for C4H4 (-2341 kJ/mol), C4H8 (-2755 kJ...
May 20, 2007 by Jayd

health
i was completing my study guide so i can study and i ran across these questions and needed help? An activity done in a short burst at a high level of intensity without oxygen is___. A.aerobic B.anaerobic C.intense D.maximal Sarah wants to know her target heart rate zone.Her ...
December 17, 2013 by matt

Science
A student goes fishing in the bay.He catches a few fish and dicides to put them with other fish in a small fishpond behind his house.The next day he notices that all the new fish have died. Which is the MOST LIKELY reason the fish died? A.They did not have enough space B.They ...
April 18, 2007 by hot stuff

CHEMISTRY...........
1. If 29.0 L of methane, CH4, undergoes complete combustion at 0.961 atm and 140įC, how many liters of each product would be present at the same temperature and pressure? My answer: (0.961 atm)(29.0 L) (413k) all divided by (413)(0.961 atm)=29.0 L CO2 29.0 L CO2 x 2LH2O/1LCO2=...
October 11, 2013 by Anonymous

AP Chemistry
A 34.05 gram liquid sample of an unstable compound is deposited in a metal piston assembly that has a cylinder with a diameter of 20.0 cm. After the sample is added, the piston is placed in contact with the liquid and the piston vent is closed. This process removes all ...
September 26, 2012 by Jack

chemistry
A calorimeter consists of an interior metal bomb (container) surrounded by 2.22 kg of water all contained within an insulated exterior wall. A sample of propane, C3H8, weighing 6.89g, was burned in the calorimeter with excess oxygen. As a result of the combustion, the interior...
July 16, 2008 by Anonymous

Chemistry
Use these answers for questions 4 - 7. (A) 1s2 2s22p5 3s23p5 (B) 1s2 2s22p6 3s23p6 (C) 1s2 2s22p62d10 3s23p6 (D) 1s2 2s22p6 3s23p63d5 (E) 1s2 2s22p6 3s23p63d3 4s2 4. An impossible electronic configuration 5. The ground-state configuration for the atoms of a transition element ...
April 12, 2007 by Rachel

thermochemistry
what is the enthalpy change in kilojoules for the combustion of 1 mol of ethanol, C2H5OH (l), to form gaseous carbon dioxide and gaseous water? use bond energies to calculate your answer. (hint: there is a double bond in carbon dioxide and oxygen) the answer is supposed to be...
January 23, 2007 by Sienna

Chemistry
Which of the four factors affecting reaction rate is most important in each example below? Choose from among concentration, temperature, surface area, and catalyst. A? Extra dish soap is added to help cut the grease when washing a frying pan. = Concentration B) Firewood is ...
July 18, 2010 by Derrick

Biology
Can someone please check if my answers are correct? 21. The difference between autotroph and heterotroph is that a. heterotrophs must get energy from sources other than the sun b. heterotrophs can use chemical or light energy sources c. heterotrophs do not obtain energy from ...
January 22, 2010 by mysterychicken

Check Answers Please
1. The two health-related components of fitness are muscular strengthand muscular endurance. True False 2. Circuit resistance training utilizes only aerobic energy. True False 3. The training program for muscular endurance should not resemble the activity for which the ...
October 21, 2014 by mstv

science
why does a candle appear to go out when a copper coil is placed over the flame? Combustion requires three things: fuel (wax here), oxygen (air here), ignition temperature (a match here probably). Remove one and the combustion stops -- that's the principles firemen use to put ...
June 21, 2006 by jenna

Physics. Please help. Thanks
in the last three years, Fred's basketball team won 30 more games than they lost. if they won 150 games, what was their ratio of wins to losses? What are three different ways to show the ratio? what is the unit rate if Ramon drives his car 180 miles in 3 hours? what is the ...
September 26, 2012 by sk8rgurl

Health JUST NEED ANSWERS CHECKED :)
1. The two health-related components of fitness are muscular strengthand muscular endurance. True False 2. Circuit resistance training utilizes only aerobic energy. True False 3. The training program for muscular endurance should not resemble the activity for which the ...
October 21, 2014 by mstv

plz help now, chemistry
How do you write chemical formulas? For example how so you right a chemical formula for calcium fuoride? Calcium flouride would be CaF2 This is because .. Calcium symbol - Ca Flourine symbol - F you would write CaF BUT you must consider charges calcium has a 2+ charge and ...
December 21, 2006 by Beautiful

English
how would i combine these sentences using compound subj. and verbs? -- They use it to produce the energy they need. your muscles need alot of oxygen. you should relax. you should move only as much as necessary. with these techniques you can train yourself to stay underwater ...
August 14, 2007 by Kathy

biochemistry
I have three questions. I don't even know where to begin. 1. a) If an in vitro fatty acid synthesizing system is supplied with [2-14C]-acetyl CoA as the only source of radioactive label along with all other necessary cofactors/reactants for net fatty acid synthesis, in what ...
December 9, 2010 by an

Chemistry
if you could just help me set them up the would do me some good. Thanx A. In the single reaction of chlorine and potassium bromide, how many grams of potassium chloride can be produced from 200.g each of chlorine and potassium bromide? Identify the limiting reactants. B. In ...
October 29, 2007 by Monte'

Biology
A series of laboratory experiments are set up to investigate various aspects of the photosynthetic process in Elodea canadensis, a common species of pond weed which lives underwater. In the experiment a fixed quantity of Elodea canadensis is incubated underneath an inverted ...
March 11, 2013 by Anonymous

chemistry
Element Symbol Atomic Mass --------------------------------------- Bromine Br 79.904 Calcium Ca 40.078 Carbon C 12.011 Chlorine Cl 35.4527 Cobalt Co 58.93320 Copper Cu 63.546 Flourine F 18.9984032 Hydrogen H 1.00794 Iodine I 126.904 Iron Fe 55.847 Lead Pb 207.2 Magnesium Mg 24...
April 15, 2008 by Chris

Chem
Hi everyone, I'm having problems with effective nuclear charge. Regarding these problems. Calculate Zeff for a valence electron in an oxygen atom. and Calculate Zeff for the 4s electron in a copper atom, . and Calculate Zeff for a 3d electron in a copper atom, Cu. Like for the...
November 7, 2008 by Vinny

Chemistry
Hi everyone, I'm having problems with effective nuclear charge. Regarding these problems. Calculate Zeff for a valence electron in an oxygen atom. and Calculate Zeff for the 4s electron in a copper atom, . and Calculate Zeff for a 3d electron in a copper atom, Cu. Like for the...
November 9, 2008 by Robert

Science
1. Which of the following can be expected to occur as climate change continues on Earth? (1 point) decreased melting of sea ice decreased migration of pests and pathogens increased freshwater sources increased coastal flooding* 2. Which piece of childrenísí playground ...
March 14, 2014 by Anonymous

chemistry
what is the total number of electrons shared in a double covalent bond between two atoms, and why? four. One covalent bond is two electrons, a double convalent is twice that. why wouldnt it be 8? Because 2*2=4. Reread Bob Pursley's answer. Two electrons is a single bond; ...
December 17, 2006 by Jim

Chemistry
How can you find out how many unpaired electrons are present in gaseous Co3+ ion in its ground state? According to the NBS Circular 467 "Atomic Energy Leves", Co(3+) has 24 electrons with structure 1s(2), 2s(2), 2p(6),3s(2), 3p(6), 3d(6), and spectroscopic designation 5D4. (...
August 3, 2007 by Vic

Science(chem)
I have a few questions I need help with! 1. Hydrogen bonding will account for the unusual physical properties of water. TRUE FALSE 2. Air is considered to be a homogeneous mixture that is 79% nitrogen gas, 20% oxygen gas and 1% all the other gases. In this mixture, nitrogen ...
March 12, 2008 by salinas

Chemistry
I posted this question a bit ago and received some help..but need more.. thanks Use the following information to identify element A and come pound B, then answer questions a and b. An empty glass container has a mass of 658.572 g. It has a mass of 659.452 g after it has been ...
April 12, 2007 by Julia

Chemistry
DECOMPOSITION OF NO2 (10/10 points) The decomposition of NO2 at room temperature exhibits the following variation in concentration with time: The concentration of NO2 is expressed in mol/liter, while time is expressed in seconds. [NO2] ln[NO2] 1/[NO2] Time (s) 0.0831 -2.4877 ...
July 30, 2014 by 3.091

science
How can someone's blood literally boil when they go into a plane at too high an altitude? They said it was called the bends on tv. I've heard of the bends but only when people go diving and then they have to go into this chamber. The bends in water is caused by the divers ...
August 17, 2007 by ~christina~

CHEMISTRY HELP!
I am COMPLETELY LOST for this one...dnt even know where to start MOLES 1) Lithium Hydroxide reacts with Carbon Dioxide to form solid Lithium Carbonate and Water. How many grams of carbon dioxide can be absorbed by each 1 gram of lithium hydroxide. 2) Part of the SO2 (sulfur ...
October 31, 2006 by Kim

Geography (Ms. Sue)
1). What river has an international group trying to save? A: An international group has been trying to save the Tisza River. 2). What diseases are linked to air pollution? A: Respiratory diseases such as asthma, bronchitis, and emphysema, as well as lung cancer, are linked to ...
October 5, 2013 by Anonymous

Chemistry
What is the charatteristic of covalent bonding meaining what happens and then what is the result from what happened (like does it form a molecule, compund, etc. . . Same thing for ionic bodnging The ionic part is discussed below. Look for a chemistry post by smooches. Here is ...
November 30, 2006 by direct in Effect

Science
Use the words to fill in the blanks of the paragraphs. 1.plants 2.pieces 3.moisture 4.ice wedging 5.acids 6.carbon acid 7.freezing 8.chemical 9.oxidation 10.temperatures 11.minerals 12.climate 13.desert 14. mechanical 15.cracks 16 reacting Weathering is the breaking of rocks ...
January 7, 2013 by Toxii

Environmental Issues
My science teacher says that cattle flatulence is destroying the ozone layer. If this is true, what can we do to regulate the flatulence output of cattle in order to preserve the ozone? http://www.guardian.co.uk/climatechange/story/0,12374,905360,00.html http://www.google.com/...
May 10, 2007 by Joey

chem-repost
I ddin't know if anybody would look far down to page to help me answer my question but this is what was said so far. Posted by rebekah on Sunday, October 24, 2010 at 4:48pm. Give the general formula for any dialkene; that is, a straight-chain hydrocarbon with two double bonds ...
October 24, 2010 by rebekah

Bio
A biologist was experimenting with a corn plant that had previously incorporated radioactive carbon into starch stored in its cells. She measured the radioactivity present in the following compounds: Sugar extracted from the plant CO2 producd by the plant Alcohol, if produced ...
November 19, 2009 by Trishia

Chemistry
Can someone please give me an example of a chemical reaction of scandium with oxygen? Thanks This site may have the information you need. http://www.webelements.com/webelements/elements/text/Sc/chem.html that's awesome, thank you! :) You're welcome. Sorry, I've got another ...
June 9, 2007 by Lacey

Light
1. If you're driving towards the sun late in the afternoon, you can reduce the glare from the road by wearing sunglasses that permit only the passage of light that's A. dispersed in a spherical plane. B. polarized in a vertical plane. C. polarized in a horizontal plane. D. ...
October 3, 2013 by StarBuddy

physics
При 0į С молекулы кислорода имеют среднюю скоро&#...
May 29, 2011 by lisa

physics
In the process of electrolysis, electrical power is used to separate water into oxygen and hydrogen molecules via the reaction: H2O --> H2 + ĹO2 This is very much like running a hydrogen fuel cell in reverse. We assume that only the activation potential for the hydrogen ...
December 21, 2013 by Donald

Animal Physiology HELP!!!!!!!!!!
Please help me!!! What are the answers to these Animal Physiology questions? Urgent..... A decrease in the partial pressure of carbon dioxide in the lungs is referred to as a) Respiratory acidosis b) Hypercarbonia c) Hyperoxia d) Hypercapnia ...
July 31, 2013 by Sally

Chemistry
Cyclohexane is composed of 85.6 % C and 14.4% H. when it is mixed in the proper ratio with oxygen, it can be used as an anesthetic. At 755 mmHg, and 25 degrees Celcius, it has a density of 2.05 g/L. what is the molar mass of cyclohexane and its molecular formula? Will you ...
October 15, 2006 by Anonymous

re-apchem post
a 2L container is charged with 2atm of O2 at 298 Kelvin. Ch4(g) + 2O2(g) --> CO2(g) + 2H20(g) calculate the partial pressure of methane needed to react completely with the O2 in the vessel. What is the total pressure after the reaction is complete if the temperature ...
April 12, 2009 by sarah

Healthcare
Could someone please let me know if I am on the right track with this paragraph and feel free to critique me very strictly as my instructor will do. My assignment was to explain what is in whole blood and what is the purpose of red cells,platelets and plasma. I must explain ...
August 5, 2008 by Anonymous

Science
1. Which of the following can be expected to occur as climate change continues on Earth? (1 point) decreased melting of sea ice decreased migration of pests and pathogens increased freshwater sources increased coastal flooding 2. Which piece of childrenísí playground equipment...
January 10, 2014 by anonymous

Science
1. Which of the following can be expected to occur as climate change continues on Earth? (1 point) decreased melting of sea ice decreased migration of pests and pathogens increased freshwater sources increased coastal flooding 2. Which piece of childrenísí playground equipment...
January 12, 2014 by anonymous

Science
1. Which of the following can be expected to occur as climate change continues on Earth? (1 point) decreased melting of sea ice decreased migration of pests and pathogens increased freshwater sources increased coastal flooding 2. Which piece of childrenísí playground equipment...
January 13, 2014 by anonymous

physical science (light)
1. An object 5 millimeters high is located 15 millimeters in front of a plane mirror. How far from the mirror is the image located? A. 5.0 millimeters B. 7.5 millimeters C. 15 millimeters *** D. 30 millimeters 2. Which of the following values represents an index of refraction ...
June 10, 2010 by Mari

chemistry
Dear Dr. Bob, Go to this website listed and you will see that this is not a take home exam. This is my professor's website and you can see his comment on the exams we took today 7/7/10. I just want to know what my score is so I can just relax. type in eee dot uci dot edu slash...
July 7, 2010 by G

science
please check my answers:)1. Which of the following can be expected to occur as climate change continues on Earth? (1 point) decreased melting of sea ice decreased migration of pests and pathogens increased freshwater sources increased coastal flooding 2. Which piece of ...
October 2, 2014 by Buttercup214

English A1 Poem
All afternoon my brothers and I have worked in the orchard, Digging this hole, laying you into it, carefully packing the soil. Rain blackened the horizon, but cold winds kept it over the Pacific, And the sky above us stayed the dull gray Of an old year coming to an end. In ...
October 27, 2009 by Mark

Chem
How do you figure out the Noble Gas Configuration? Also, why do you not put in the "p" level and when do you( if you even do) put it in? You need to be more specific about your question. Elements that lose electrons (Na, Ca, Al, etc) gain the noble gas structure of the noble ...
March 20, 2007 by Ty

Economics
You should start a new post instead of adding on to an existing post. That said, I would go with A Which of the following statements is true?? A) The value of a good may change over time. B)A highly valued good is always more expensive than a lesser valued good. C)Highly ...
June 5, 2007 by economyst

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