Posts by Jamie

Total # Posts: 1,186

Chemistry - Molecular Formula
Nevermind, I got it. I totally forgot about multiplying empirical formulas to the nearest whole number. It's actually: C3H7O3 Which makes the formula mass 91.086 Which makes the molecular formula C6H14O6

Chemistry - Molecular Formula
A carbohydrate contains 39.56% C, 7.75% H, and 52.70% O by mass. A solution of 11.3 g of this carbohydrate in 375 g of ethanol has a boiling point of 78.49 deg C. The boiling point of ethanol is 78.29 deg C, and Kb for ethanol is 1.23 deg C*kg/mol. What is the molecular ...

Chemistry II
When a specific amount of propanol (C3H8O) is added to 110.0 g of pure water at 60°C, the vapor pressure of water over the solution is lowered by 1.596 kPa. Given the vapor pressure of water at 60°C is 19.932 kPa, what is the mass of propanol added?

Ms. Sue help
Ms. Sue, I have posted 2 questions for ELA today but never got a response. Can you see if I made an error when I sent? Thank you, as always for your help.

ELA
In the book "The Watsons Go to Birmingham 1963", which of the following events from the story most accurately represents the time period in which the story is set? 1) Mr. Watson nicknames his car the "Brown Bomber" 2)Larry Dunn uses shoe polish to make ...

ELA
Choose the meaning that best matches the word in italics. After finding several errors, the author insisted that his book be pulled from the shelves until a version that was "amended" could be published. 1)abridged 2)expanded 3) revised 4)photographed I think #3 Thanks

social studies
Geothermal is considered a ? 1)fossil fuel 2)renewable resource 3)nonrenewable resource 4)recyclable resource I think #2 Thanks

Physics
A satellite orbits Neptune 4000km above its surface. given the mass of Neptune is 1.02x10^26 kg and the radius of Neptune is 2.48x10^7m, Calculate the orbital speed of the satellite

Art
THANK YOU SO MUCH L0L

Science
Which of the following is NOT a function of the skeletal system? 1)supports the body 2)works with other body systems to allow movement 3)manufactures new blood cells 4)sends signals to the brain I think #3. Can you check? Thanks

math
?ABC and ?ABD are a linear pair. Prove that m?ABC + m?ABD = 180°. paragraph proof

Science
A hormone is under negative feedback regulation. This hormone stimulates water retention by the body. Which of the following will happen if water levels in the body get too high? 1) hormone levels will increase 2) hormone levels will decrease 3) antibodies will form 4) the ...

Science
A man wakes from sleep, hears a strange noise, becomes alarmed and runs downstairs. Which of the following describes the corresponding events taking place in his nervous system ? 1)sensory neuron>spinal neuro>brain>motor neuron 2)sensory neuron>brain>spinal cord...

Science
Which of the following sets of terms could be used in a description of the peripheral nervous system? 1)motor neurons 2)brain and spinal cord 3)motor neurons 4)sensory neurons and spinal cord I think #1. Can you check? Thanks.

Math
Write 3 16/25 as a percent. A)3.64% B)3.80% C)364% D)380% I think A. Can you check? THANKS

Physical Science A
Anyone??

Physical Science A
What daughter product is produced when thallium–206, an isotope of thallium, undergoes beta minus (?–) decay?

Math
A recipe for 24 cookies calls for 6 tablespoons of sugar. If you make 36 cookies and use 10 tablespoons, will the cookies taste the same? Explain I know if 24 calls for 6 tablespoons and if the recipe is increased by 12cookies or 1/3, you will only need 9 tablespoons of sugar...

Math
A machine takes 4.2 hours to make 7 parts. At that rate, how many parts can the machine make in 28.8 hours? Round answer. 1)48 parts 2)41 parts 3)172 parts 4)17 parts I think #1. Thanks

social studies
The PUSH-PULL theory is used by scientists to explain? 1) how people fight 2)mountains 3)immigration 4)farming methods I think #3. Can you check? Thanks

Social Studies
Kit-kat is correct!

Health and PE
Alcohol is categorized as ? (2 of below) 1)drug 2)stimulant 3)a depressant 4)a carcinogen I think 1 and 3. Can you check? I could not find this in my lesson. Thanks.

Science
Which word or phrase best describes the function of the urinary bladder? 1)filter 2)storage tank 3)blender 4)passageway I think #4, can you check for me? Thanks.

math
Based on the information from Part 1, determine whether each statement is True or False. Statements True - True False - False Jasmine's best friend lives .25 inches past the camp, which is 240 total miles away. Jasmine covers .75 inches in the first hour, which is 70 miles...

math
Jasmine is looking at a map to determine how many miles it is to the camp she will be attending this summer. The scale of the map is 14 inch = 20 miles. The total distance to the camp on the map is 2.75 inches. Which proportion shows how many miles it is to the camp?

Science
which of the following summarizes the function of the respiratory system? 1) transport oxygen to cells and wastes away from ells. 2)to protect the organs in the chest cavity. 3)to move oxygen from the air into the body and carbon dioxide from the body into the air 4) to ...

Science
Which of the following describes the path of blood between the heart and the lungs? 1)heart-capillaries-veins-arteries-heart 2)heart-arteries-veins-capillaries-heart 3)heart-arteries-capillaries-veins-heart 4)heart-veins-capillaries-arteries-heart I think #3. Can you check my ...

Health and PE
Oxygen enters the blood in the ? 1)bronchi 2)pharynx 3)larynx 4)alveoli I think #4 Thanks !

social studies
Which climate region dominates most of Northern Africa? 1)humid continental 2)highland 3)tundra 4)arid I think #4 after looking at the maps. Can you confirm? Thank you for your help.

Science
Which of the following functions like a fulcrum in a lever? A:tendons connecting a muscle to a bone at a joint. B:ligaments connecting bones at a joint. C:two muscles working as a pair to move a joint. D: two bones meeting at a joint. I think the answer is B. Thank you.

Physics
A 1.45 kg book is sliding along a rough horizontal surface. At point A it is moving at 3.25 m/s , and at point B it has slowed to 1.34 m/s . Part A How much work was done on the book between A and B? Part B If -0.750 J of work is done on the book from B to C, how fast is it ...

Physics
A rope is tied to a box and used to pull the box 1.7 m along a horizontal floor. The rope makes an angle of 30? with the horizontal and has a tension of 5 N. The opposing friction force between the box and the floor is 1 N. Part A How much work does gravity do on the box? Part...

Physics
A tennis player hits a 58.0 g tennis ball so that it goes straight up and reaches a maximum height of 7.02 m . Part A How much work does gravity do on the ball on the way up? Part B How much work does gravity do on the ball on the way down?

Science
metals Thank you.

Science
What kind of substance does the following, reflects light, warms up in my hand, flattens out if hit with a hammer, conducts electricity? 1)nonmetal 2)metal 3)metalloid I think #3

Geography
Distortion on a map may change the shape of? 1)a globe 2)the equator 3)the Prime Meridian 4)some landmasses I think #4

Geography
Globe....thanks Ms.Sue. You always point us in right direction. I appreciate you and all the tutors.

Geography
I know that the equal-area is used to show landmasses but my reading did not mention the bodies of water. Thanks

Geography
The most accurate way to show Earth's continents and bodies of water is with a(an)? 1) Mercator projection 2) globe 3) Robinson projection 4) equal-area map I think #3

Math
solve the inequality: -3(4-a)=6 1) -6 2) -2 3) 2 4) 6 I think #1 is correct. Can you check? Thanks

Math
A semi circle sits on top of a rectangle to form the figure below find its area and perimeter use 3.4 for pie on the side 4 inches and on the bottom 6 inches what is the answer

Math
Orly uses 2 cups of raisins for every 8 cups of trail mix she makes how many cups of trail mix will she make if she uses 12 cups of raisins

Math
Solve the inequality: 25>1-3d A) d<-8 B) d>8 c) d<8 D) d>-8 I think B

Health and PE
What substance in tobacco products causes stained teeth and skin? 1) nicotine 2)carbon monoxide 3)tar 4)menthol I think #1 Thanks

Science
Sodium is a medal and chlorine is a poisonous gas. Neither is safe to eat. However, when sodium and chlorine is combine, it produces edible table salt. What can be concluded? 1) Table salt has similar physical properties of both reactants. 2)Table salt is a metalloid with ...

Physics
Artificial gravity. One way to create artificial gravity in a space station is to spin it. If a cylindrical space station 325 m in diameter is to spin about its central axis, at how many revolutions per minute (rpm) must it turn so that the outermost points have an ...

Physics
You tie one end of 0.3-m-long spring to a 0.5 kg mass. Holding the other end of the spring in your hand, you whirl the mass in a vertical circle at a speed of 3 m/s. If the spring elongates 5 cm at the lowest point in the circular motion, what is the spring constant?

Algebraic Properties
Can you tell me the properties of algebraic expressions? Is there a website? Thanks for your help.

Math
use the inverse operation to solve below equation. 19= h/3-8 equals 81 Thanks

English
C: The lion (smelled) the steak.

English
In which of the following sentence is the underlined verb used as an action verb? 1) The animal (looked) hungry. 2) The trainer (felt) worried. 3) The lion (smelled) the steak. 4) The steak (tasted) good. I think B Thanks.

Math
Factor 81-27p is A)9(9-3p) B)27(3-p) C)27(54-p) D)27(p-3) I think A but not sure. Is there a website that explains simplifying Algebraic Expressions? Thanks for your help.

Science
Which physical properties are characteristic of normal solids? 1)brittle 2)little luster 3)malleable 4)ductile 5)good conductors of heat I think #1 and #2

Science
Which physical properties are characteristic of metals? Choose all that apply. 1) brittle 2)high luster 3)malleable 4)ductile 5)not very reactive I think #s 2,3 and 4 Thanks

social studies
After the Scientific Revolution, scientists no longer made their ideas about science fit? 1) the results of their experiments 2) the teachings of the church 3)their observations in nature 4)their political beliefs I think #2 Thanks

Health and PE
_____ is at the top of Maslow's hierarchy of needs? 1) physical needs 2)safety 3)esteem 4)self-actualization I think #4 but all are important. Thanks

Science
When you measure the boiling point of mercury, you are investigating a ____? 1)chemical change 2)chemical property 3)physical change 4)physical property I think #3. This is a practice but want to make sure. Thanks,

SS
sorry I think the answer is C, Thank You

SS
During the Middle Ages, why was life in northern Italy different from life in the rest of Europe? A:italians were threatened by Muslim invaders. B:italians were not as closely controlled by nobles or the church. C:italians were controlled by popes and kings. D:italians were ...

social studies
Which group was especially interested in winning the Crusades? 1)farmers 2)teachers 3)merchants *** 4)artists I think merchants, because of the trade. Thanks for your help.

Health and PE
Which of the following plays a role in determining a persons weight? select all that apply A:heredity. B:activity level. C:body mass index (BMI). D:body composition. I think the answers are B, C, and D. Thank you.

social studies
In the Middle Ages, ceremonies such as weddings had t be performed by? 1) the mam of the house 2)a bishop 3)a priest 4)the pope I chose #2 but reading stated the clergy attended all ceremonies. If the man of the house and clergy are the same then it would #1. Thank you.

social studies
Why did the system of feudalism arise during the Middle ages? A:to develop an economic system. B:to determine jobs within a city. C:to defend the countries from attacks. D:to organize the household of noblemen. I think the answer is C. Thank you

Science
I think #3 because it combine 2 mixtures, but #4 also is combination of mixtures but not in same amt.

Science
Which of the following represents a heterogeneous mixture? 1)saltwater 2)air 3)bleach and water 4)chicken noodle soup I think #3 Thank you.

AP Chemistry
In the reaction below, 17 g of H2S with excess O2 produced 10 g of sulfur. 2 H2S + O2 ? 2 S + 2 H2O . What is the percent yield of sulfur? Answer in units of %.

AP Chemistry
Got it! Thank you :)

AP Chemistry
The reaction of 8 grams of fluorine with excess chlorine produced 6.4 grams of ClF3. What percent yield of ClF3 was obtained? Answer in units of %

AP Chemistry
Thank you!!

Chemistry - Rates
For a particular reaction, the rate constant is 2.32???10?3 M/s at 185°C and 3.70???10?3 M/s at 235°C. What is the activation energy for this reaction? _______ kJ/mol

Chemisty - Colligative properties/freezing point
QUESTION: How do you determine the molar mass of the unknown, nonelectrolyte compound for each trial? This is for a lab. My data is: freezing point of solvent (water): -0.58 freezing point of unknown: -0.93 Mass of solvent (water): 19 ml Mass of unknown: 1.045g I know the ...

social studies
yes, the calendar ! Thank you, Ms.Sue

social studies
Which of the following was an achievement of the Mayas? 1) a system of canals in their main city? 2) the city of Tenochtitlan 3) a calendar 4) a strong army I think it is 1 but not sure. Thanks for your help.

Chemistry - Colligative properties/freezing point
I need help on my lab. I think I have all the data and steps right, but my results aren't making sense: Feezing point of water: -0.58 C Freezing point of Unknown: -0.93 C Freezing point depressions: 0.34 C Mass of unknown: 1.045 g, mass of solvent (water): 19 ml, Water=1....

Chemistry
The rate constant for the decomposition of acetaldehyde, CH3CHO, to methane, CH4, and carbon monoxide, CO, in the gas phase is 1.59???10?2 L/mol/s at 711 K and 3.63 L/mol/s at 855 K. Determine the activation energy (in kJ/mol) for this decomposition. ______ kJ/mo

Chemistry
At 500 K in the presence of a copper surface, ethanol decomposes according to the following equation. C2H5OH(g) CH3CHO(g) + H2(g) The pressure of C2H5OH was measured as a function of time and the following data were obtained. Time (s) PC2H5OH (torr) 0 250. 100. 237 200. 224 ...

social studies
The port cities of East Africa traded with ? 1)China,India, and Soutwest Asia 2)Songhai 3)Europe and the Americas 4)Portugal I think number 1. I have read the text several times but still not sure. Thanks for your help.

Math. Please help!!
The "perpendicular bisector" of the line segment \overline{AB}(The backslash then over line with the {AB} means that there's a line over AB) is the line that passes through the midpoint of \overline{AB} and is perpendicular to \overline{AB}.

Algebra A
The "perpendicular bisector" of the line segment \overline{AB}(The backslash then over line with the {AB} means that there's a line over AB) is the line that passes through the midpoint of \overline{AB} and is perpendicular to \overline{AB}.

Algebra A (1510)
Yes, I do.

Algebra A (1510)
Also how do you find slope?

Algebra A (1510)
Thanks for the help!

Algebra A (1510)
The "perpendicular bisector" of the line segment $\overline{AB}$ is the line that passes through the midpoint of $\overline{AB}$ and is perpendicular to $\overline{AB}$. The equation of the perpendicular bisector of the line segment joining the points (1,2) and (-5,...

College Algebra
I hope it makes sense now ^-^

College Algebra
You would treat the greater than or equal to sign like an equation. So, you would subtract 1/2 from each side so y would be greater than or equal to 1/6. In interval notation it would be: [1/6, inf)

Science
thank you

Science
2. Which of the following describes a relationship between science and society? A: Scientific discoveries can impact human life; therefore, society must remain scientifically literate. B: Scientific discoveries rarely impact human life; therefore, it is not necessary for ...

social studies
Mecca lay on a trade route on the edge of the desert that takes up most of? 1)the Red Sea 2)Syria 3)the Kabah 4)the Arabian Peninsula I think # 4 is correct even though, today most of this area is Syria. Thanks

Spanish 1
Which of the following geographical locations share borders with SPAIN? 1)Portugal, France, Atlantic Ocean 2)France, England, Pacific Ocean 3) Italy, France, Mediterranean Sea I think #1 Thank you

Calculus II
Find the derivative of 5^(x^3+x) I know the answer, it's: 5^(x^3+x)*ln(5)*(3x^2+ 1) I just need some help on how to derive that. What rule is at work here? where did the ln come from?

Economics - Finance
Your first baby was born yesterday and is healthy and strong. To guard against your premature death, you want to purchase a life insurance policy that will replace $58,000 of your annual income until your child is 20 years old. How much life insurance should you purchase, if ...

Chemistry
A chemist makes a solution of K2SO4 by dissolving 21.7 g K2SO4 in water to make 100.0 mL of solution. What is the concentration of SO42? ions in the solution? Assume that K2SO4 is the only solute in the solution. The molar mass of K2SO4 is 174.27 g/mol.

Math
Thank you. The answer is 34%?

Math
THe Acme Industrial Tech College has fallen on hard times. Last year its enrollment dropped by 20%, and this year enrollement dropped another 15% from last years. Next year the college expected to have 50% of this years enrollment. What percent of enrollment can be expected to...

Chemistry - Stoichiometry/gases
Ah, Okay. Thanks!

Chemistry - Stoichiometry/gases
When 2.38 g of methane burns in oxygen, 119 kJ of heat is produced. What is the enthalpy of combustion (in kJ) per mole of methane under these conditions? Your answer will be in kJ/mol. the Molar Mass of methane is 16.04, so I did 2.38g/16.04=0.14838 mol Then I did 119 kj/0....

Calculus 2
Determine the first three terms of the power series representations for the following functions: a) 2/(1+x)^3 b) 1/1+x^2 c) ln(1+x)

Calculus 2 - Indeterminant forms
lim (2^x-3^x)/(cos(x)-1) x->0 The answer the book has for this is "diverges." I know I'm supposed to use L'Hospitals' rule, but I'm not sure how. Can you walk me through the steps?

Chemistry
Ah, Okay. Thank you so much for your help. I'll be sure to pay more attention to that in the future.

Chemistry
Huh... that's weird then. I ended plugging this in: ln(56.1/101.325)=(29820/8.314)((1/T2)-(1/380.85)) And solved -0.59119=(29820/8.314)((1/T2)-(1/380.85)) to get 349.93. Then I subtracted 273.15 to get 76.78 C.

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