Friday
November 28, 2014

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

Number of results: 5,592

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
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

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

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 0° 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 + ½O2 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 children’s’ 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 children’s’ 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 children’s’ 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

Earth science
Please go over my answers and tell me what I got wrong... Telling me the correct answer would also be nice please hurry I only have 20 mins What does the principle of uniformitarianism tell us about the past? (Points: 5) The past is the key to the future. X The present is the...
January 29, 2010 by Ario

health
1. Which of the following best describes catheterization? A. Burning away of cancerous tissue B. Visualization of the large intestine C. Implantation of an intrauterine birth control device D. Placement of a drainage tube into the bladder 2. Which is a condition of the male ...
December 22, 2010 by Anonymous

chemistry
1. The atomic number of carbon is 6. Its nucleus must contain: a) 6 neutrons and 6 protons. b) 3 protons and 3 neutrons. c) 6 neutrons and no electrons. d) 6 protons and no electrons. e) 6 protons and 6 electrons...
February 10, 2010 by cassie

Statistics
I am not sure if I can compare the measurments fro the above study with the standard normal distribution. I feel like I do not have enough data. Am I right or is it the standard normal distribution ? Medication at the end of life During the last month of life, residents were ...
October 26, 2011 by AAS13

Science
1. Which of the following sets of terms could be used in a description of the peripheral nervous system? A. motor neuron, interneuron, sensory neuron B. brain, sensory neuron, myelin C. interneuron, spinal cord, autonomic D. somatic, brain, spinal cord 2. Which of the ...
June 1, 2014 by Mstv

Chemistry - solubility
Arrange the following compounds in order of increasing solubility in water: * O2 * LiCl * Br2 * CH3OH Like dissolves like; that is, polar compounds usually are soluble in water and non-polar compounds are not soluble in water. From that description, make your choices and post ...
January 2, 2007 by Belinda

AP Chemistry
This is part of a marathon problem, we have to identify the five compunds of H, N, and O described below. For each compound, I have to write a Lewis structure that is consistent with the information given. a.) All the compunds are electrolytes, although not all of them are ...
December 4, 2011 by Kristin

AP chem
This is part of a marathon problem, we have to identify the five compunds of H, N, and O described below. For each compound, I have to write a Lewis structure that is consistent with the information given. a.) All the compunds are electrolytes, although not all of them are ...
November 7, 2007 by Corey

AP chem
This is part of a marathon problem, we have to identify the five compunds of H, N, and O described below. For each compound, I have to write a Lewis structure that is consistent with the information given. a.) All the compunds are electrolytes, although not all of them are ...
November 7, 2007 by Corey

Chem 1
Given the bond energy data below, which is the best prediction for the bond energy of the bond between the nitrogen and the oxygen atom in N2O? bond energy (kJ/mol) N-O single bond 201 N-O double bond 607 Indicate if it will be the single bond, double bond or an intermediate ...
November 16, 2006 by Rossina

chemistry
1.The equilibrium constant for the oxidation of elemental iron metal, Fe, by oxygen, O2 to form hematite, according to the reaction 2Fe + (3/2)O2 = Fe2O3 is known to have the value K=exp(+68.8) at 1000C. The equilibrium constant for the formation of CO2 from carbon and O2, C...
July 5, 2010 by GM

Geography
question: Compare and contrast the various sources of energy. answer: There are various sources of energy, which modern industrial countries use to light cities, power cars and airplanes, and run computers and other electrical machines. The main energy sources for all these ...
January 7, 2010 by y912f

chemistry
1) If a total of 13.5 mol NaHCO3 and 4.5 mol of C6H8O7 react, how many moles of COs and NA3C6H5O7 will be produced? 3NaHCO3(aq) +C6H8O7(aq) -> 3CO2(g) + 3H2O(s) + Na3C6H5O7(aq) 2) If 8,00 mol of NH3 reacted with 14.0 mol of O2, how many moles of H20 will be produced? 4NH3(g...
May 4, 2011 by shaquifa

chemistry
How do you know the state of an element or compound when writing chemical equations? Unless otherwise known, assume the state of the element at room temp. Here is the real problem. For aqueous compounds, ie, compounds dissolved in water, you have to have that given. There is a...
September 16, 2006 by sue

Chemistry
Here goes. I am NOT an organic chemist so please obtain other sources for information; i.e., don't take my work as gospel. a) I believe the second one you list is more reactive because the first one is sterically hindered due to the isopropyl group. And bromine is a huge ...
September 27, 2006 by DrBob222

account
You and several of your colleagues business partners have decided to establish an outpatient fertility clinic in your service area. All of you are very familiar with this patient population base, have completed an extensive market analysis that demonstrated a great need for ...
November 13, 2013 by Taylor

health
You and several of your colleagues business partners have decided to establish an outpatient fertility clinic in your service area. All of you are very familiar with this patient population base, have completed an extensive market analysis that demonstrated a great need for ...
November 13, 2013 by Taylor

statistics
1. In a biology class, your final grade is based on several things: a lab score, scores on two major tests and your score on the final exam. There are 100 points available for each score. However, the lab score is worth 25% of your total grade, each major test is worth 22.5% ...
May 27, 2010 by elsa

Child Care
1.At what age does exercise begin to result in strength in boys and girls? a)between ages 1 and 2 b)between ages 3 and 4 c)between ages 5 and 6 d)between ages 6 and 7 2.Temperatures in child care education setting should be set at __ in the summer and __ in the winter. a)55 to...
March 9, 2011 by Destiny

AP Chem ?
I had posted this question before and wanted to know if I had gotten the right answers. We have to identify the five compunds of H, N, and O described below. For each compound, I have to write a Lewis structure that is consistent with the information given. a.) All the ...
December 3, 2006 by Sam

Chem
I have a chemistry test that I need help with. My answers have stars by them Can someone please help me with the answers to this test??? Part 1 – Matter as Energy & Structure 1. When a pair of electrons is shared between two atoms, a covalent bond is said to have formed. Most...
July 20, 2011 by Winona

someone correct my work please? fun, fun chemistry
Okay. I'm very, very confused. The initial question is: predict the products of the electrolysis of a 1 mol/L solution sodium chloride. This is my work: The four different possible equations are: 2H2o + 2e- -------> H2 + 2OH- (V= -0.83) O2 + 4H+ + 4e- -------> 2H2O (V= 1...
January 30, 2007 by Rienna

engineering
In the process of electrolysis, electrical power is used to separate water into oxygen and hydrogen molecules via the reaction: H2O --> H2 + ½O2 This is very much like running a hydrogen fuel cell in reverse. We assume that only the activation potential for the hydrogen ...
December 19, 2013 by Timothy Boons

physics
In the process of electrolysis, electrical power is used to separate water into oxygen and hydrogen molecules via the reaction: H2O --> H2 + ½O2 This is very much like running a hydrogen fuel cell in reverse. We assume that only the activation potential for the hydrogen ...
December 20, 2013 by Arnold Smith

health
1. Which of the following best describes catheterization? A. Burning away of cancerous tissue B. Visualization of the large intestine C. Implantation of an intrauterine birth control device D. Placement of a drainage tube into the bladder ANSWER:D 2. Which is a condition of ...
December 22, 2010 by Anonymous

English
To My Valentine More than a catbird hates a cat, Or a criminal hates a clue, Or the Axis hates the United States, That's how much I love you. I love you more than a duck can swim, And more than a grapefruit squirts, I love you more than a gin rummy is a bore, And more than a ...
May 2, 2010 by Sara

English
Had to correct sentences so the parallel ideas are expressed 1. Is it true that Superman could leap tall buildings, run faster than a locomotive, and those bullets would bounce off his skin? 2. To celebrate the canned pork product called Spam, we attended the Texas Spamarama ...
May 7, 2011 by Amor

chemistry
In the TV show "Breaking Bad" the characters attempt to use HF acid to dissolve guns (among other things). Here we consider instead dissolving guns (which we will assume are pure iron) with sulfuric acid. Complete the balanced reaction for reacting iron in dilute sulfuric acid...
December 18, 2013 by Danny Simone

math
In the TV show "Breaking Bad" the characters attempt to use HF acid to dissolve guns (among other things). Here we consider instead dissolving guns (which we will assume are pure iron) with sulfuric acid. Complete the balanced reaction for reacting iron in dilute sulfuric acid...
December 18, 2013 by Danny Simone

chemistry
a sample consisting 22.7g of a nongasous unstable compound X is placed inside a metal cylinder with a radius of 8Cm and a piston is carefully placed on the surface of the compound so that for all practical purposes the distance between the bottom of the cylinder and the piston...
April 20, 2008 by tom

carbon+sugar=starch
Why are you saying that carbon is needed to make starch? Actually only sugar (glucose) is needed along with an enzyme to catalyze the linkage of multiple glucose units in a dehydration (loss of water) reaction. Glucose + Glucose ----> maltose + H2O maltose is disaccharide. ...
August 27, 2005 by DrJeff

Science help ASAP
1. In which way does the circulatory system rely on the skeletal system? Glucose is secreted by compact bone as an energy source for blood. Spongy bone stores minerals needed by blood cells. Bones provide a source of oxygen to blood. Blood cells are produced in bone marrow. 2...
May 5, 2014 by Anonymous

chemistry
Which solvent will dissolve more in given solute: 1. Ethylene glycol (HOCH2CH2OH) in hexane(C6H14) or H2O 2. Diethyl ether (CH2CH2OCH2CH3) in H2O or CH3OH? 3. NaCl in CH3OH or CH3CH2CH2CH2OH I know that like dissolves like. Therefore the molecules with the similar ...
April 26, 2007 by Gabriela

AP Chemistry
The Synthesis of an Iron Oxalato Complex Salt (“Green Crystals”) In this experiment you will synthesize a compound that will contain the elements potassium, iron, carbon, hydrogen, and oxygen. Carbon and oxygen will be present in the compound as oxalate (C2O4-2) whereas ...
October 17, 2012 by Colin

chemistry
Subject – equilibria Pure ethanoic acid (25.0cm3, CH3COOH), pure ethanol (35.0 cm3, C2H5OH) and pure water (20.0cm3, H2O) were mixed in a sealed flask at room temperature. The flask was placed in a heated water bath and maintained at 323K until equilibrium was established. ...
May 7, 2012 by yaya

PHYSICS
A Few questions- please help!!! also show steps! What magnitude of force, acting for 0.025 s, will change the velocity of a 100 g ball from 30 m/s eastward to 40 m/s westward? A girl holds a 1.7 kg air rifle loosely and fires a bullet of mass 2 g. The muzzle velocity of the ...
January 4, 2012 by Dyl

Chemistry
From this equation, how many glocose does the human body consume ineach minute? If gram per mole is 180.16. The human body needs at least 0.0103 mole O2. Equation C6 H12 O6 + 6O2-->6CO2 +6HO2 How many glucose what? grams? moles? tons? Mext, the human body needs at least 0....
March 25, 2007 by Jerremy

physical chemistry
I tried working out this problem but am unsure of a few steps. Please help me if you can. Consider O3 --->1.5O2 At 210degrees Celsius and an initial gas pressure of 0.23atm, it is found that the rate of reaction is 1.8E-2 mol/(Lxs). a) What is the change in the total gas ...
January 17, 2007 by ajones

Science help urgent :/
I need to help my brother with this, he waited till the last minute to complete his homework... 1. _________ is a solid fossil fuel that forms from plant remains. Coal Hydrocarbon Natural gas Petroleum 2. Air pollution can be controlled by permitting more storm runoff. burning...
January 8, 2014 by Anonymous

Science-Experiment-Questions
I did an experiment on a burning candle, and I need help with some of the questions. Thank you very much in return. Please no websites.--more information would be appreciated, thanks:-) I'll list everything of what we went through. Materials: -1 standard candle -scale -ruler -...
April 7, 2010 by Sara

Dr.Bob222- IChemical formulas&Reactions
When aqueous copper(II)chloride reacts with aqueous ammonium phosphate, soluble ammonium chloride forms and copper(II) phosphate precipitates out of solution. 1. Write the balanced molecular equationfor this reaction. 2. Write the balanced complete ionic equation for this ...
January 3, 2007 by chrissy

11th grade
A sample consisting of 22.7 g of a nongaseous, unstable compound X is placed inside a metal cylinder with a radius of 8.0 cm, and a piston is carefully placed on the surface of the compound so that, for all practical purposes, the distance between the bottom of the cylinder ...
January 2, 2009 by rikita

Chemistry
A sample consisting of 22.7 g of a nongaseous, unstable compound X is placed inside a metal cylinder with a radius of 8.0 cm, and a piston is carefully placed on the surface of the compound so that, for all practical purposes, the distance between the bottom of the cylinder ...
January 5, 2009 by lulu

Anatomy & Physiology
1. What are the constituents of DNA? A. Sugars and lipids B. Proteins and sugars C. Sugars, phosphates, and nitrogenous bases D. Lipids, nitrogenous bases, and proteins 2. What is the mechanism that maintains a stable environment within the body? A. Symptoms B. Syndrome C. ...
January 24, 2014 by Diana

Chemistry- Please help me
A sample consisting of 22.7 g of a nongaseous, unstable compound X is placed inside a metal cylinder with a radius of 8.00 cm, and a piston is carefully placed on the surface of the compound so that, for all practicla purposes, the distance between the bottom of the cylinder ...
December 16, 2008 by Lauren

AP Chem
Would someone please check these for me? 52. In an experiment, you fill a heavy-walled 5.00-L flask with methane gas, CH4. If the flask contains 7.13 g of methane at 19 degrees C, what is the gas pressure? 2.14 atm 56. A 2.50-L flask was used to collect a 5.65-g sample of ...
November 19, 2008 by Anna

Anatomy & Physiology
Someone please check my answer and tell me if they are right or wrong. 1. What are the constituents of DNA? A. Sugars and lipids B. Proteins and sugars C. Sugars, phosphates, and nitrogenous bases D. Lipids, nitrogenous bases, and proteins 2. What is the mechanism that ...
January 23, 2014 by Diana K

AP Chemistry
I have the following marathon problem but am unsure where to start: A Sample consisting of 22.7g of nongaseous, unstable compound X is placed inside a metal cylinder with a radius of 8.00cm, and a piston is carefully placed on the surface of the compound so that, for all ...
October 2, 2007 by Derek

AP Chemistry
I have the following marathon problem but am unsure where to start: A Sample consisting of 22.7g of nongaseous, unstable compound X is placed inside a metal cylinder with a radius of 8.00cm, and a piston is carefully placed on the surface of the compound so that, for all ...
October 2, 2007 by Derek

World Geography
Latin America and North America 1. The _______ were responsible for the forced migration of more people from Africa than any other colonial power. A. Portuguese B. Dutch C. Spanish D. British 2. Regarding tropical rainforests, the term evapotranspiration refers to the fact ...
February 19, 2013 by Dale

Chemistry Questions!!
I was sick for 2 days, and that's really not good in any chemistry class, let alone mine, which is an advanced one. I don't know what I was thinking when I tried to be smart, but I really need help. It's pretty basic, I think, so anyone..? Also, I really have tried these......
December 13, 2006 by Trish

water treatment
A wastewater treatment plant based on activated sludge with biological phosphate and nitrogen removal via pre-denitrification. The influent flow (dwf) is 30,000 m3/day and the influent BOD concentration is 300 mg BOD/l. The suspended solid concentration in the influent is 150 ...
November 24, 2013 by Anon

AP Biology
1.Oparin and Haldane hypothesized that the Earth's early atmosphere was strongly (2 points) acidic. oxidizing. reducing. ~~ ionic. 2.The most significant outcome of the Miller and Urey experiments was that they (2 points) synthesized living cells from nonliving matter. ...
September 12, 2012 by henry

Chemistry
a.) All the compunds are electrolytes, although not all of them are strong electrolytes. Compunds C and D are ionic and compund B is covalent. b.) Nitrogen occurs in its highest possible oxidation state in compunds A and C; nitrogen occurs in its lowest oxidation state in ...
March 26, 2007 by Amanda

geography
1-20 can you please check my answers marked with *** which of the following were the main proponents of NAFTA? a. labor unions b. human rights groups c. environmentalists ***d. large corporations in the 1950s 40 percent of the u.s workforce was engaged in manufacturing by the ...
February 14, 2014 by cali

chemistry
I need help with a,b,and c. I tried to balance it but im having a little trouble Ethane gas, C2H6, burns in air and produces carbon dioxide and water vapor. a)write a balanced equation for this reaction. I know this isnt balanced but is this what im working with? C2H6 + O ---&...
March 25, 2007 by beth25

science help plzzz
Multiple Choice 1. Which of Earth's spheres contains mountains, valleys, and other landscapes? (1 point) atmosphere biosphere geosphere hydrosphere 2. Which of the following are examples of destructive forces? (1 point) ice wind both ice and wind neither ice nor wind 3. Earth ...
January 22, 2014 by josh

CHEM
a mixture of 10cm3 of methane and 10cm3 of enthane was sparked with an excess of oxygen. after coolin to room temp, the residual gas was passed thru aq KOH. what volume of gas was absorbed by the alkali ? Write the equations for CH4 + O2 and C2H6 + O2. Balance them. Look to ...
May 29, 2007 by Pet

chemistry check
1. 48 KNO3+ _ C 12 H22O11-„³ ? CO2+ _ N2+ _ K2CO3+ _ H2O a. 12 b. 24 s c. 36 d. 48 The reaction is 48 KNO3 + 5 C12H22O11 --> 24 K2CO3 + 36 CO2 + 55 H2O + 24 N2 So the answer is C =36 2. 6 KNO3+ _ S + ? H2O„³ _ H2SO4+ _ N2+ _ K2SO4 a. 2 b. 4 c. 6 d. 8 The balanced reaction ...
January 24, 2007 by key

Heat!!!
Can you please check my answers. My teacher gave me a list of 200 questions to study, but I lost the answer sheet. Can you please help me with these 23 Thanks 1. A silver bar 0.125 meter long is subjected to a temperature change from 200°C to 100°C. What will be the length of ...
July 5, 2011 by Brooke

waste water treatment
ACTIVATED SLUDGE AND NUTRIENT REMOVAL =========================================== A wastewater treatment plant based on activated sludge with biological phosphate and nitrogen removal via pre-denitrification. The influent flow (dwf) is 30,000 m3/day and the influent BOD ...
November 20, 2013 by ham

Science
1. Which of the following gases was most likely present in Earth's earliest atmosphere? (1 point) A) nitrogen B) hydrogen* C) argon D) oxygen 2. Which of the following statements accurately describes the development of the geologic time scale? (1 point) A) Scientists developed...
November 7, 2013 by Nicole M.

Science-Urgent
I did an experiment on a burning candle, and I need help with some of the questions. Thank you very much in return. Please no websites.--more information would be appreciated, thanks:-) I'll list everything of what we went through. Materials: -1 standard candle -scale -ruler -...
April 6, 2010 by Sara

Statistics
The makers of the MAGNETIZER Engine Energizer System (EES) claim that it improves gas mileage and reduces emissions in automobiles by using magnetic free energy to increase the amount of oxygen in the fuel for greater combustion efficiency. Following are test results, ...
April 15, 2012 by Nicole

science HELP ASAP!!!!!!!
12. How do the cherries on a cherry tree help the plant reproduce? (1 point) Cherries develop into seeds, which are young, undeveloped plants. Animals eat the cherries, which helps disperse the plant’s seeds. Pollen inside the cherries fertilizes ovules, which produce seeds. ...
March 3, 2014 by annonomys

Statistics help please!!!
The makers of the MAGNETIZER Engine Energizer System (EES) claim that it improves gas mileage and reduces emissions in automobiles by using magnetic free energy to increase the amount of oxygen in the fuel for greater combustion efficiency. Following are test results, ...
April 15, 2012 by Nicole

chemistry
a sample consisting 22.7g of a nongasous unstable compound X is placed inside a metal cylinder with a radius of 8Cm and a piston is carefully placed on the surface of the compound so that for all practical purposes the distance between the bottom of the cylinder and the piston...
April 21, 2008 by timmy

chemistry
I posted this question on April 16 and received lots of 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 ...
April 18, 2007 by Julia

AP CHEM FULL ?
This is part of a marathon problem, we have to identify the five compunds of H, N, and O described below. For each compound, I have to write a Lewis structure that is consistent with the information given. a.) All the compunds are electrolytes, although not all of them are ...
December 2, 2006 by Sam

bio(updated) Devron
Please help me with these questions. I have taken out some of the questions that i was a 100% sure of. I just need you to check for me the ones i'm not too postive about. I would really appreaciate the help! Thank you in advance. 1. The phenomenon of autocatalysis is involved ...
February 9, 2013 by Angela

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