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May 24, 2016

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

Number of results: 6,616

Biology - oxidative phosphorylation
Some things I don't understand: If oxygen accepts electrons from the electron transport chain, how does it become a molecule of water? ie where does the hydrogen come from? In chemiosmosis, protons are pumped against their concentration gradient across the inner mitochondrial ...
April 23, 2008 by JJ

chemistry
Which would produce greater number of moles of product: a certain amount of hydrogen gas reacting with oxygen gas to make water, or the same amount of hydrogen gas reacting with nitrogen gas to make ammonia? Why?
April 11, 2010 by tay

Biology
1. Plant seed coats, mycorrhizae, and cuticles are examples of a. ways plants have adapted to life on land b. evolutionary adaptations to limit water absorption c. mechanisms to enhance carbon dioxide release d. both B and C D? 2. Stomata help plants a. survive on land b. ...
February 26, 2010 by mysterychicken

Chemistry
.Question part Points Submissions 1 0/0.5 2/3 Total 0/0.5 ...In the explosion of a hydrogen-filled balloon, 0.75 g of hydrogen reacted with 6.9 g of oxygen to form how many grams of water vapor? (Water vapor is the only product.) i already posted this but i dont think people ...
September 11, 2010 by Rebekah

earth science
What are the names and symbols of the two elements found in all silicate minerals? http://en.wikipedia.org/wiki/Silicate After reading see if you think Oxygen and Silicon might be the answers
November 14, 2006 by mjklolk

phy
An emphysema patient is breathing pure O2 through a face mask. The cylinder of O2 contains 0.20 ft3 of O2 gas at a pressure of 2200 lb/in2. (a) What volume would the oxygen occupy at atmospheric pressure (and the same temperature)? ft3 (b) If the patient takes in 8.0 L/min of ...
April 13, 2013 by kira

phy
An emphysema patient is breathing pure O2 through a face mask. The cylinder of O2 contains 0.20 ft3 of O2 gas at a pressure of 2200 lb/in2. (a) What volume would the oxygen occupy at atmospheric pressure (and the same temperature)? ft3 (b) If the patient takes in 8.0 L/min of ...
April 13, 2013 by kira

Are my answers correct? Chem
I really need help with balancing these equations: Can you check if my answer are correct? Please 1. Sodium Hydrogen Sulfite reacts with hydrochloric acid to produce sulfur dioxide gas, water and sodium chloride NaHSO3 + HCl = SO2 + H2O + NaCl 2. Sodium nitrate reacts with ...
March 14, 2011 by Anonymous

biology
Cellular Respiration and Photosynthesis co-exist as paired metabolic processes. Photosynthesis uses light energy to convert carbon dioxide into glucose, a simple sugar, in two steps, the light dependent and light independent reactions. Oxygen is produced as a by product ...
November 21, 2008 by Anonymous

CHEM
Hydrogen peroxide (H2O2) is decomposed according to the following reaction: 2H2O2 (l) 2H2O (l) + O2 (g) If 6.00 g of aquesous solution containing hydrogen peroxide was decomposed after heating, the mass of oxygen gas collected is 2.40 g, what is the mass percentage of H2O2 ...
December 30, 2014 by CHAN

Chemical Bonding
Predict the type of bond present between carbon and suffer in vulcanized runbber? Is that ionic. Please tell me how I can figure out what bonds are present in different chemical reactions. Like phospherous nad oxygen in a DNA molecule. CS bond is covalent. Look at the ...
January 14, 2007 by Karen

chemistry
In the reaction O2+2NO->2NO2 what is the ratio of oxygen reacted to nitrogen dioxide produced? Nitrogen monoxide to nitrogen dioxide? We had to calculate the concentration of each, for which I have O2=-1.01x10^-5, NO=-2.03x10^-5 and NO2=2.04x10^-5. I'm not sure how to do it...
March 12, 2015 by alyssa

Chemistry......
If the statement is true, write a T in the blank. If the statement is false, rewrite it to make it correct. 1. An inert gas reacts easily with other elements 2. Radioactive decay is dependent on external forces such as temperature and pressure Fill-in-the-blanks An (11...
September 8, 2013 by Anonymous

Chem
If the statement is true, write a T in the blank. If the statement is false, rewrite it to make it correct. 1. An inert gas reacts easily with other elements 2. Radioactive decay is dependent on external forces such as temperature and pressure Fill-in-the-blanks An (11...
September 8, 2013 by Anonymous

Japan's Nuclear Crisis
How does nuclear fission create energy? Nuclear energy is produced through the splitting, or fission, of a uranium atom in the core of a nuclear reactor. When hit by a neutron, the atom divides and releases two other neutrons, as well as heat and radioactive particles. The ...
April 19, 2011 by Anonymous

earth science
what class of minerals contains the element oxygen bonded to a metallic element http://en.wikipedia.org/wiki/Iron_oxide
April 4, 2007 by tiff

Science (please check Ms. Sue)
Please check this. Thanks! 1. Which of the following shows fossils as evidence of continental drift? a. Limestone layers in the Appalachian Mountains of North America were exactly the same as the limestone in Scotlands highlands. b. Mesosaursus, an ancient reptile, had been ...
April 27, 2016 by SpitFireRedHead

chemistry
Which of following statements correctly describes energy levels? A. Electrons can never move to a higher or lower energy level. B.In it's outermost energy level, oxygen has 4 valence electrons. C. The second energy level holds a maximum of eight electrons. D. The greater the ...
August 23, 2014 by Yui

chemistry
Which of the following statements correctly describes energy levels? A. Electrons can never move to a higher or lower energy level. B. In its outermost energy level, oxygen has 4 valence electrons C. The second energy level holds a maximum of eight electrons. D. The greater ...
September 2, 2014 by Emiko

chemistry
which of the following statements correctly describes energy levels? A. Electrons can never move to a higher or lower energy level. B. In its outermost energy level, oxygen has 4 valence electrons C. The Second energy level holds a maximum of eight electrons. D. The greater ...
September 6, 2014 by Hideko

Chemistry
Aluminum is more reactive than iron, yet it is used today for a variety of applications in which iron would corrode (cans, rain gutters,etc). The reason for the corrosion durability of aluminum is 1. all aluminum products are treated with a plastic coating. 2. aluminum does ...
October 20, 2010 by Sarah

Chemistry
Help please? 1)A sample of propane gas occupies 625 cm3 at 20.0 C and 750 torr. What is the final volume in cubic centimeters at -80.0 C and 750 torr? 2)If oxygen gas is collected over water at 25 C and 775 torr, what is the partial pressure of the O2? The vapor pressure of...
April 16, 2014 by May

chemistry
Nitrogen dioxide abstracts with water vapor to produce oxygen and ammonia gas. If 12.8 grams of nitrogen dioxide reacts with 5.00 liter of water vapor at 375 degrees celisus and 725 tore, how many grams of ammonia can be produced? Use an ice table.
November 2, 2014 by sally

Chemistry
Can you please someone check my answer for me? I don't know how to start thses answer. Chemistry is not my things. Please give me answers. :( a)Determine the number of grams in 0.750 moles of the compound Iron(II)phosphate: Fe3(PO4)2. answer: 129.68grams 357.477722g/mol is ...
April 1, 2010 by Anonymous

Nuclear FIssion
How does nuclear fission create energy? Nuclear energy is produced through the splitting, or fission, of a uranium atom in the core of a nuclear reactor. When hit by a neutron, the atom divides and releases two other neutrons, as well as heat and radioactive particles. The ...
April 19, 2011 by Anonymous

chemistry-balanced redox equations
Use the following steps to balance the redox reaction below: Mg + Au+ Mg2+ + Au a. Write the oxidation and reduction half-reactions. Make sure each half-reaction is balanced for number of atoms and charge b. Multiply each half-reaction by the correct number, in order to ...
March 25, 2012 by princess

Chemistry
A reaction between gaseous sulfur dioxide and oxygen gas to produce gaseous sulfur trioxide takes place at 600◦C. At that temperature, the concentration of SO2 is found to be 1.14 mol/L, the concentration of O2 is 1.39 mol/L, and the concentration of SO3 is 3.18 mol/L. ...
April 23, 2016 by Olivia

Chemistry
How can i tell how many electrons an element has? like Carbon The atomic number is the number of protons in the nucleus AND the number of electrons. Carbon has an atomic number of 6; therefore, it has six electrons. Oxygen is 8; Ne is 10 etc.
November 12, 2006 by Bryan

Chemistry
A sealed container comtains 1.50 mol of nitrogen gas, 2.00 mol of oxygen gas and 3.50 mol of argon gas. If the total pressure is 900 kPa, what is the pressure of the nitrogen gas?
January 18, 2015 by Sandy

chemistry
Electrolysis of water produces hydrogen gas and oxygen gas, which can be collected over water: 2H2O(l) → 2H2(g) + O2(g) An electrolysis reaction at 735 mmHg pressure produced 25.00L of gas at 25C; at which point, the vapor pressure of water is 23.76 torr. How many grams...
October 13, 2015 by Lay

chemistry
2C3H6(g) + 2NH3(g) + 3O2(g) -> 2C3H3N(g) + 6H2O(g) A 150.0 liter steel reactor at 25 ºC is filled with the following partial pressures of reactants: 0.500 MPa C3H6, 0.800 MPa ammonia, and 1.500 MPa oxygen gas. If the reaction proceeds to 90% yield, and no side reactions ...
March 18, 2014 by keitanako

Chemistry
I'm trying to find if potassium nitrate is polar or non-polar by using the electronegativity scale. Can someone check my work? Electronegativity: potassium: 0.82 nitrogen: 3.04 oxygen: 3.44 =3.44-3.04 =0.82-0.4 =0.4 =0.42 So the final answer is 0.42 and by looking at the ...
November 10, 2007 by Marty

Honors Chemistry
I have to fill in the blanks of these questions with the elements H (hydrogen), Co (cobalt), Ga (gallium), and O (oxygen), but different sources are telling me different things: 7. Its most common oxidation state is -2 8. A metal with more than one oxidation state 9. Metal ...
September 28, 2009 by Emily (different from one before me)

chemistry
Gasohol contains ethanol (C2H4OH)(l), which when burned reacts with oxygen to produce CO2(g) and H2O(g). How much heat is released when 12.5g of ethanol burns? C2H5OH(l) + 3 O2(g) --> 2 CO2(g) + 3H2O(l) Delta H = -1368kJ Chemistry - DrBob222, Wednesday, May 19, 2010 at 9:...
May 19, 2010 by Kieth

chemistry
2. Predict the approximate amount of heat liberated by burning a gram of candle wax and a gram of propyl alcohol (Note: candle wax is a mixture of saturated carbon compounds with 20 or more carbons in each molecule and no oxygen. Propyl alcohol has the formula C3H7OH.) If time...
October 19, 2010 by vanessa

chem hwk
a simple hwk question.. i don't understand what i need to do.. 1-butanol (shown below) burns in the presence of oxygen to give off carbon dioxide and water by the following reaction: C4H9OH + 6 O2 ==> 4 CO2 + 5 H2O If 40.88 mL of 1-butanol burns completely, how many grams ...
January 24, 2013 by wll.i.am

Chemistry
Combustion of a 0.1595 g of menthol (156 g/mol) produces .449 g of Carbon Dioxide and 0.184 g of Water. What is the formula of menthol? I am really confused as to where to start. I converted the Carbon Dioxide and Water to moles and got .102 mol for both of them but now I don'...
September 25, 2013 by Taylor

Chemistry
1. Suppose o2, n2 and Ar were placed at 1.00 atm and 273 K in closed containers. A tiny hole is opened in each container, allowing each gas to diffuse into another container filled with neon gas. What is the ratio of the rate of diffusion of nitrogen to the rate of diffusion ...
May 22, 2015 by casey

Chemistry
equilibrium constant for; so3 <----> so2 + 1/2o2 is found to be 0.471M^1/2 @ 600deg C after a quantity of sulfur trioxide is allowed to come to equilibrium in a 1L flask @ 600deg C, 0.2 mol oxygen was found to be present. What mass of sulfur trioxide was initially placed...
July 19, 2011 by Maya

chem
how do u calulate percentage composition of NO2 [mass N/mass NO2] x 100 = %Nitrogen [mass O2/mass NO2] x 100 =%oxygen
March 17, 2007 by san

Chemistry
In the redox conversion of CO to CO2− 3 , the oxidation number of C goes from (−2, 0, +2) to (−4, −2, +4, +6). Recall that the oxidation number of oxygen is typically −2. 1. +2; +6 2. −2; −4 3. 0; −2 4. 0; +6 5. −2; +6 6. +...
September 30, 2012 by Kayla

chemistry
I want to have a deep insigth to my problem i.e. I know that bonds between atoms(of different or same elements)to be formed are based on no. of electrons less in octet or duplet(say O2, each O atom has two electrons less in octet thus forms two bonds).But why bonds between e...
February 10, 2010 by mohit

chemistry
an unknown element crystallizes in a face-centered cubic unit cell. with an edge length of 392.4 pm. The solid has a density of 21.09 g/cm^3. what is atomic weight of solid? so what i did was : FC cubic uit --> 4 atoms edge length--> l = 2*root2*r = 392.4 pm = 392.4 * 10...
November 8, 2012 by Ania

CHEMISTRY
Use the following balanced chemical equation to calculate the mass of carbon dioxide produced from the burning of 5.50 kg of jet fuel which can be represented by the molecule C12H26. You should quote your answer to 3 significant figures in units of kg. The relative atomic ...
December 28, 2008 by trigger

biology
In both lecture and lab, the significance of water (H2O), molecular oxygen (O2), and carbon dioxide (CO2) has been emphasized with regard to their energy content or participation in metabolic oxidation and reduction reactions. This lab has demonstrated that green leaf tissue ...
October 27, 2010 by tina

Chemistry
0.0337g of a volatile liquid when vaporized completely at 100Pa and 300K occupied a volume of 20cm3. When this volume of vapor was completely burnt in an excess of oxygen, 40cm3 of carbon dioxide and 20cm3 of water vapor were formed. All volumes being measured at the same ...
February 18, 2012 by Shaun

Chemistry
Virtually all the nitric acid manufactured commercially is obtained by the ammonia oxidization process. This involves this first step: Ammonia gas combines with oxygen to form nitrogen monoxide and water vapour. a) Write a balanced equation for the reaction 6 NH3 + 4 O2 -> ...
January 20, 2015 by Kayla

physical science
I have been working on my homework for science for a while now and I just wanted to see if I got any questions wrong. Can someone help me by checking what problems i got wrong. My parent told me that I have at least 5 problems wrong. Can someone point them out for me and help ...
February 14, 2008 by PETA

chemistry
Consider the following chemical equilibrium: SO3(g) --> SO2(g) + 1/2 O2(g) and Delta H = 98.9J a. Predict weather the forward or reverse reaction will occur when the equilibrium is disturbed by: i. adding oxygen gas ii. compressing the system at constant temperature iii. ...
March 6, 2008 by linda

chem
Suppose a hydrogen-oxygen fuel-cell generator was used to produce electricity for a house. Use the balanced redox reactions and the standard cell potential to predict the volume of hydrogen gas (at STP) required each month to generate the electricity needed for a typical house...
August 9, 2010 by Anonymous

Chemistry
I need help with this question. 1. You have a tank of helium with a volume of 10 liters that is currently under 40 atm of pressure. If you open the valve on the tank and release the helium into a room with a volume of 10,000 liters, how many atmospheres of pressure will the ...
December 18, 2014 by Anonymous

Chemistry
Dimethylamine burns in oxygen according to the following equation: 4 C2H7N + 15 O2 → 8 CO2 + 14 H2O + 2 N2 (a) How many liters of O2 at 35 C and 0.840 atm will be needed to burn 7.70 L of C2H7N at 35 C and 0.840 atm? (b) How many liters of CO2 at 35 C and 0.840 atm ...
December 1, 2012 by Joe

Chemistry
Dimethylamine burns in oxygen according to the following equation: 4 C2H7N + 15 O2 → 8 CO2 + 14 H2O + 2 N2 (a) How many liters of O2 at 35 C and 0.840 atm will be needed to burn 7.70 L of C2H7N at 35 C and 0.840 atm? (b) How many liters of CO2 at 35 C and 0.840 atm ...
December 1, 2012 by Sarah

science(reading)
"he proved the existence of neutrons - elementary particles devoid of any electrical charge. In contrast with the helium nuclei (alpha rays) which are charged, and therefore repelled by the considerable electrical forces present in the nuclei of heavy atoms, this new tool in ...
November 2, 2012 by Samantha

Conceptual Physical Science
When we breathe we inhale oxygen, O2, plus water vapor, O2, and exhale carbon dioxide, CO2, plus water vapor, H2O. Which likely has more mass, the air that we inhale or the same volume of air we exhale? Does breathing cause you to lose or gain weight?
July 10, 2010 by Laticia

Sogeri high school
Hydrazine,N2H4 burns in oxygen... A...what are their product?(in chemical equation). B..How many bondes are broken? C..How many new bonds are formed from the. product side... D.Total energy required to break the bond? E.Total energy realised when new bonds are formed? F.the ...
September 3, 2014 by wilfer kopz

chemistry
Write the balanced equations for the following examples: a) potassium hydroxide + sodium sulfide --> potassium sulfide + sodium hydroxide b) carbon disulfide + oxygen --> carbon dioxide + sulfur dioxide
March 10, 2012 by Nene

chem
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/mol), and H2 (-286 kJ/mol), ...
November 27, 2007 by mel

Science
Does anyone know anything about respiration?? Cause I have to do this chart thing and it says: Respiration uses glucose and oxygen to produce carbon dioxide and water and water is used to carry out all _________. I don't know what the blank is I have read my science over and ...
November 5, 2008 by Kelsie

chemistry
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 (-2766 kJ/mol) and H2 (-286 kJ/mol), ...
December 28, 2010 by Lux

Chem (Thermodynamics)
Calculate the temperature (in C) to which silver ore, Ag2O, must be heated to spontaneously decompose the ore to oxygen gas and solid silver metal at standard state. (ΔHf of Ag2O(s) = 31.05 kJ/mol; S values: Ag(s), 42.55 J/molK; O2(g), 205.1 J/molK; Ag2O(s), 121.3 J...
February 28, 2012 by M

Chem (Thermodynamics)
Calculate the temperature (in C) to which silver ore, Ag2O, must be heated to spontaneously decompose the ore to oxygen gas and solid silver metal at standard state. (ΔHf of Ag2O(s) = 31.05 kJ/mol; S values: Ag(s), 42.55 J/molK; O2(g), 205.1 J/molK; Ag2O(s), 121.3 J...
February 29, 2012 by M

Science - DrBob222
tocainide a drug that has been used to restore a regular heartbeat in patients with arrhythmia. .................................. .....CH3.........O............. ......__/...........||............ .....//\\_______N___C___CH___NH2...
February 6, 2007 by Sean

Ion Charge & Formulas of Ionic Compounds
Can you please take a look at my questions. Thank you very much. 1.classify the law of definite proportions. In specific proportions, A type of compound always contains the same elements. Is this good? Any other info would be greatly appreciated. 2.how do u distinguish the ...
April 20, 2010 by Sara

health
Which one of these statements is true regarding blood circulation? A. For health and survival, it's critical for blood circulation to be ongoing and uninterrupted. B. Normally, blood circulates in a repeating stop-start rhythm. C. The heart deoxygenates blood that's returned ...
July 28, 2008 by AK

Chemistry
Nitrogen can also be produced from sodium metal and potassium nitrate by the reaction: Na(s) +KNO3 (s) --> K2O(s) +Na2O(s) + N2(g) If we generate oxygen by the thermal decomposition of potassium chlorate: 2KClO3(s) --> 2KCl(s) +3O2(g) How many grams of potassium nitrate ...
November 8, 2015 by Ka_Chin

chemistry
HOF-->HF + 1/2O2(oxygen) Half life: 30 minutes If the partial pressure of HOF in a 1.00 L flask is initially 100 mm Hg at 25C, what is the total pressure in the flask and the partial pressure of HOF after exactly 30 minutes?
March 31, 2010 by Anonymous

College Chemistry
Oxygen has a Henrys law constant of 1.3*10^-3 mol/kg*bar at 25 C when dissolving in water. If the total pressure of gas ( gas plus water vapor) over water is 1.00 bar, what is the concentration of O2 in the water in grams per milliliter? (The vapor pressure of water at 25 C...
February 3, 2016 by Pablo

Chem
Fungal laccase is .390% Cu by mass. If a fungal laccase molecule contains 4 Cu atoms, what is the molar mass of fungal laccase? Molar mass= mass of 4Cuatoms/.390
December 5, 2006 by Steve

Science (Chemistry)
The question: Balance each of the following skeletal equations by using oxidation and reduction half reactions. All the reactions take place in acidic solution. Identify the oxidizing agent and reducing agent in each reaction. a) Cl[sub]2[/sub] (g) + S[sub]2[/sub]O[sub]3[/sub...
February 11, 2007 by Jo

Chemistry
given this reaction: 2CO(g) + O2(g)---2CO2(g) what volume of CO2 will be produced when 8.45 liter of CO reacts with enough oxygen? I thought the answer would be 8.45 liters of CO2 because there was a ratio in the balanced equation of 2CO yielding 2CO2, so I thought the ration ...
February 19, 2008 by Frances

Chemistry
a chemist wanted to make 100 grams of SO2. She had only 12 grams of sulfur and 4 grams of oxygen. Unfortunately, the amounts of reactants were not enough to make the desired product. How much S and O2 would she need in order to obtain the desired grams of product with no ...
November 3, 2011 by jermain

Chemistry
identify the functional group and indicate polar bonds by assigning partial positive and negative charges. 1) The structure CH3OCH3 is drawn out and I know that this is an ether because the O is bonded to two carbons but I am not sure how to assign the charges. I think that ...
October 4, 2012 by hannah

8th Grade Science
There is a connection between photosynthesis and cellular respiration. The products from one provide the raw materials for the other. What products of photosynthesis are starting materials for cellular respiration? A. glucose and oxygen B. heat energy and ATP C. carbon dioxide...
March 6, 2014 by Lauren

chemistry
a) Calculate the number of moles of nitrogen dioxide, NO2, that could be prepared from 79.0 mol of nitrogen oxide and 82.0 mol of oxygen. 2NO(g)+O2(g)⟶ 2NO2(g) b) Identify the limiting reagent and the excess reagent in the reaction. What would happen to the potential ...
August 24, 2014 by Will

College Chem
Oxygen gas has a Henry's law constant of 1.66*10^-6 M/mm Hg at 40 degree C when dissolving in water. If the total pressure of gass (O2 gas plus water vapor) over water is 1.0 atm, what is the concentration of O2 in the water in grams per milliliter? Pressure of the water ...
October 15, 2013 by Kimmy

chm
Which of the following facts is evidence for the existence of induced dipole-induced dipole interactions between molecules? Answer >>>Ions in water become surrounded by water molecules and this is what we observe as "dissolving." Water freezes into a solid made up of ...
February 20, 2013 by lucky

Science....HURRY! Please respond ASAP!!!!
0=X=0 The model above shows how an unidentified element, X, forms covalent bonds with oxygen. In which group on the periodic table does Element X most likely belong? A. Group 6 B. Group 12 C. Group 14 D. Group 18 I think it is either C or D. So X must be a four-valent atom. ...
March 21, 2007 by anonymous

science
3) Some ionic compounds contain a mixture of different charged cations. For example, some titanium oxides contain a mixture of and ions. Consider a certain oxide of titanium that is 28.31% oxygen by mass and contains a mixture of and ions. Determine the formula of the compound...
February 13, 2012 by annuni

CHEMISTRY
Which statement about structure and bonding is INCORRECT? a. ) The bond length is the internuclear distance. b. ) The covalent bond is a region of high electron charge density between two atoms. c. ) Hybrid orbitals are combination of atomic orbitals. d. ) There are the same ...
July 3, 2009 by David

Physics
A 64.3 kg astronaut is on a space walk when the tether line to the shuttle breaks. The astronaut is able to throw a 10.0 kg oxygen tank in a direction away from the shuttle with a speed of 11.9 m/s, propelling the astronaut back to the shuttle. Assuming that the astronaut ...
January 26, 2015 by Kev

physics
REALLY NEED HELP WITH THIS PLEASE. One gram of palladium has 5.6610^21 atoms, and each palladium atom has 46 electrons. How many electrons are contained in 7.00g of palladium? The elemental charge is1.610^−19C. Answer in units of electrons. The answer is 1.82252x10^24 ...
February 8, 2015 by Danny

biology
1 mole of an element or compound contains 6.20 times 10 to the 23rd power atoms or molecules of the element or compound. 1 mole of an element or compound has a mass equal to its mass number (or molecular weight) in grams. For example, 1 mol of hydrogen gas (H2) contain 6.02 ...
July 15, 2011 by melly

Biology Check answers
1. Which of the following correctly describes the image below?  protein Molecule RNA Molecule amino Acid carboxylic Acid 2. Glucose and fructose are monosaccharides that have the same chemical formula, C6H12O6. However, they do not react the same chemically. ...
November 20, 2015 by Anna

Chemistry
At 300.K and 1.00 atm, assume that 25 mL of NO gas reacts with 22 mL of oxygen gas and excess water to produce nitric acid according to the following equation: 2NO(g)+(3/2)O2(g)+H2O(l)-->2HNO3(g) If all of the nitric acid produced by this reaction is dissolved into 25 mL of...
March 31, 2010 by Claire

Chemistry
At 298.K and 1.00 atm, assume that 22 mL of NO gas reacts with 18 mL of oxygen gas and excess water to produce nitric acid according to the following equation: 2 NO(g) + 3/2 O2 (g)+ H2O(l)?? 2 HNO3(g). If all of the nitric acid produced by this reaction is collected and then ...
October 26, 2010 by Ricky

Biology
1. Contraction of the diaphragm causes: A. a person to exhale. B. the size of the chest cavity to increase. C. air to flow from the lungs to the outside. D. compression of the lungs. is it B 2. The function of the large intestine is to: A. supply enzymes for digestion. B. ...
August 10, 2013 by Amy

College Chemistry
Sulfur trioxide is made from the reaction of sulfur dioxide and oxygen. how many grams of SO3 can be made from the reaction of 1.91g SO2 with 1.29g O2? 2 SO2(g) + O2(g)---> 2SO3(g) a) 2.39g b) 3.20g c) 3.23g d) 4.77g e) 6.46g How would i solve this problem?? Im thinking i ...
May 4, 2010 by James

Chemistry
The crystal structure of cesium chloride (CsCl) is shown in the figure below. The dark spheres represent atoms of Cl. Identify the crystal system: Cubic Tetragonal Orthorhombic Rhombohedral Hexagonal Monoclinic Triclinic Identify the Bravais lattice: Simple cubic Body ...
November 22, 2012 by c

Chemistry
A .7178 g sample of a hydrocarbon occupies a volume of 390.7 mL at 65C and 99.2kpa. When the sample is burned in excess oxygen, 2.4267 g CO2 and .4967g H2O are obtained. What is the molecular formula of the hydrocarbon? Write a plausible structural formula for the molecule. ...
September 28, 2014 by Lisa

chem
For this problem, will someone please check my answer? How many grams of oxygen are produced in the decomposition of 5.00g of potassium chlorate? KClO3(s)--->KCl(s)+O2(g) [the equation may not be balanced] My answer is 1.96 g of O2. The balanced equation is 2KClO3 ==> ...
March 22, 2007 by Fiona

Science
When oxygen is present a. most cells utilize aerobic cellular respiration. b. most animal cells will carry on fermentation and produce lactic acid. c. most bacteria and yeasts carry on fermentation. d. two ATP molecules are produced for each glucose molecule. e. most animals ...
February 26, 2007 by Dave

Chemistry
So we have a question for chem. homework and i really don't understand. can you please explain it..... Question:There is a change in the type of oxides formed with the period three elements. Indicate the type of compounds formed (ionic, amphoteric, covalent) when the period ...
May 17, 2008 by Karina

chemistry
A 12.0g sample of carbohydrate contain 4.50g of carbon, 3.25g of oxygen, and some hydrogen. Determine the percent by mass of hydrogen in your product. Find the empirical formula for a compound that consists of aluminum and chlorine in which the aluminum is 20.2 % by mass. . A ...
March 13, 2012 by jhong

Chem
Mg + O2 ------> MgO if 1.00 g of magnesium is ignited in a flask containing 0.500liters of oxygen at STP, how many grams of magnesium oxide areproduced? what is the name and the amount of the reactant inexcess? My work: 1g Mg/24.3g=0.041 mol Mg; 0.5L O2/22.4L=0.022 mol O2...
December 30, 2014 by Lisa

chem
Methane is oxidized to water and carbon dioxide in a process, in which 10 % of the methane is converted to CO and 20 % is converted to formaldehyde. What is the yield of the process? How much methane do you need to produce a kg of formaldehyde? How much oxygen is needed in the...
November 24, 2010 by Anonymous

Science
1. What would happen to an object if the force of gravity on Earth was decreased by half? (1point) Its mass would decrease. Its weight would decrease.* Its density would decrease. Its volume would decrease. 2. Which of the following represents a heterogeneous mixture...
March 4, 2014 by Daniel Brown

Science
1. What would happen to an object if the force of gravity on Earth was decreased by half? (1 point) Its mass would decrease. Its weight would decrease.* Its density would decrease. Its volume would decrease. 2. Which of the following represents a heterogeneous mixture? (1 ...
March 4, 2014 by Daniel Brown

science
1. What would happen to an object if the force of gravity on Earth was decreased by half? (1 point) Its mass would decrease. Its weight would decrease.* Its density would decrease. Its volume would decrease. 2. Which of the following represents a heterogeneous mixture? (1 ...
March 16, 2016 by jai

chemistry,
,I NEED TO DRAW A LEWIS STRUCTURE for C2n2,cyanogen,and to state the noble gas,i know the answer is neon,but i have far to many electrons and am getting the gas argon,please help :N:::C:C:::N: please where do u think i am going wrong I don't know. You didn't show any work. C ...
March 3, 2007 by jane

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