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April 16, 2014

Homework Help: Science

Branches of Science

Recent Science Questions

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8th grade science
bbvccxzzd xxcvv g
Thursday, January 30, 2014 at 3:27pm

science
0ºC = 273ºK 600K - 273K = 327C Do you have a typo?
Thursday, January 30, 2014 at 3:27pm

science
agree
Thursday, January 30, 2014 at 3:17pm

science
Northwestern is NOT the name of your school subject,
Thursday, January 30, 2014 at 3:15pm

Science needs help
Indicate your specific subject in the "School Subject" box, so those with expertise in the area will respond to the question.
Thursday, January 30, 2014 at 3:14pm

science
http://www.agprofessional.com/agprofessi​onal-magazine/GM-food-production-increas​ing-169514076.html
Thursday, January 30, 2014 at 3:13pm

science
I think c
Thursday, January 30, 2014 at 3:05pm

Science
I'm thinking you're guessing. This starts out to be a limiting reagent problem. 2H2 + O2 ==> 2H2O mols hydrogen = grams/molar mass = about 2/2 = about 1. mols oxygen = 16/32 = 0.5 mol. Using the coefficients in the balanced equation, convert mols each to mols ...
Thursday, January 30, 2014 at 3:00pm

science
Provide at least two modern examples of how the United States has increased its food production.
Thursday, January 30, 2014 at 2:59pm

science
in a gasoline engine, the area in the cylinder head where the air-end and-fuel mixture is burned is called the A. piston B. cylinder c. combustion chamber D. intake valve
Thursday, January 30, 2014 at 2:57pm

Science
Pentane doesn't have hydrogen bonding as does 1-butanol.
Thursday, January 30, 2014 at 2:39pm

science
Actually liquid alcohol has a vapor pressure even at room temperature; however, I think the spirit of the question calls for answer A.
Thursday, January 30, 2014 at 2:28pm

physical science
A rock thrown straight up climbs for 4.24 s, then falls to the ground. Neglecting air resistance, with what velocity did the rock strike the ground?
Thursday, January 30, 2014 at 2:12pm

science
liquid alcohol will change to vapor when its temperature reaches the A. boiling point B. fusing point C. freezing point D. melting point
Thursday, January 30, 2014 at 2:07pm

Science
Does ΔT from evaportation increase or decrease with increasing molecular mass? Explain why?
Thursday, January 30, 2014 at 2:07pm

Science
Predict change in temperature for 1-butanol, CHSCH2CH2CH2OH, if same experiment were using 1-butanol?
Thursday, January 30, 2014 at 2:07pm

Science
Using concept of Surface Tension, explain why does the detergent cause the effect observed?
Thursday, January 30, 2014 at 2:05pm

Science
Explain why pentane has a significantly higher vapor pressure than 1-butanol?
Thursday, January 30, 2014 at 2:02pm

science
a silver bar 0.125 meter long is subjected to a temperature change from 2oo degrees celsius to 100 degrees Celsius what will the length of the bar be after the temperature change
Thursday, January 30, 2014 at 1:59pm

science --- check my answers!
omg, yes!!! Thank you so much Steve!!!!!:)
Thursday, January 30, 2014 at 1:54pm

science
If the absolute temperature of gas is 600K, the temperature in degrees celsius is A.273 b.705c
Thursday, January 30, 2014 at 1:51pm

science --- check my answers!
all looks good. Maybe #10 could also check (B), since boiling would drive off the water even faster than just evaporation.
Thursday, January 30, 2014 at 1:50pm

Science-check my answers plz
1 & 2 are right, but number three is freshwater ecosystem (i go to connections academy too)
Thursday, January 30, 2014 at 1:37pm

science --- check my answers!
help pls asap!!!!! check my answers!!! 4.) A certain object has a volume of 25.0 mL and a mass of 100g. What is the density of the object? a)0.250 g/mL b) 4.00/mL*** c)125 g/mL d) 2500 g/mL 5.)Which of the following is a chemical property of aluminum? a)The melting point of ...
Thursday, January 30, 2014 at 1:22pm

Science-check my answers plz
Which of the following explains why sunlight is important to aquatic ecosystems? Sunlight provides a source of heat energy to increase water temperatures. Sunlight keeps harmful bacteria from taking over aquatic ecosystems. Sunlight makes it possible for aquatic predators to ...
Thursday, January 30, 2014 at 12:47pm

Science
A SOLID has a definite shape and a definite volume.
Thursday, January 30, 2014 at 12:24pm

Science
What is the mass of water that results from combining 2.0 g of hydrogen with 16.0 g of oxygen? 14.0 g (I'm thinking this.) 16.0 g 18.0 g 20.0 g
Thursday, January 30, 2014 at 11:36am

science
By the way, if the ship had a hole in the bottom, so that it filled with water, it would sink just like the nail.
Thursday, January 30, 2014 at 10:58am

science
Archimedes says: Force up on ship or nail - weight of water displaced which is density of water times g times VOLUME OF WATER DISPLACED. In the case of the ship, assuming it is not full of water, the volume of water displaced includes the volume of the inside of the hull which...
Thursday, January 30, 2014 at 10:57am

science
Hey, many of these are trivial and I am sure you do not need our help with them. Please just post the ones you are having trouble with and show your attempt at solutions.
Thursday, January 30, 2014 at 10:54am

Science
a__has a definite shape and a definite volume
Thursday, January 30, 2014 at 10:29am

SCIENCE 1 QUESTION PLS HELP ASAP
Did you get the right answer?! i have to answer the same question and i dont know it!
Thursday, January 30, 2014 at 10:27am

science
Ship made of iron doesn't sinks but iron nail sinks. Why?
Thursday, January 30, 2014 at 7:23am

science
how do juries eat
Thursday, January 30, 2014 at 5:07am

Engineering science N4
Calculate the angle of projection of a projectile in order to hit a target 12km away.the initial velocity is 700m/s ant the time of the flight is 80seconds.
Thursday, January 30, 2014 at 4:57am

Engineering science N4
A ship is 100km north-west of cape town harbour and it sails directly north at a velocity of 30km/h in 8 hours.calculate its resultant speed with reference to the cape town harbour in magnitude and direction.
Thursday, January 30, 2014 at 4:52am

science
plz any one these are some mcqs i am preparing for a test i m not sure with the answers of these mcqs this is not a homework not an online course exam so feel free to answer these thankx MCQS 01. Changes of equal magnitude are separated by some distance. If the changes are in ...
Thursday, January 30, 2014 at 2:49am

science
plz any one these are some mcqs i am preparing for a test i m not sure with the answers of these mcqs this is not a homework not an online course exam so feel free to answer these thankx MCQS 01. Changes of equal magnitude are separated by some distance. If the changes are in ...
Thursday, January 30, 2014 at 2:48am

Science
plz any one these are some mcqs i am preparing for a test i m not sure with the answers of these mcqs this is not a homework not an online course exam so feel free to answer these thankx MCQS 01. Changes of equal magnitude are separated by some distance. If the changes are in ...
Thursday, January 30, 2014 at 2:47am

physical science
acceleration= changevelocity/time time= changevelocity/accel=14/3 seconds
Wednesday, January 29, 2014 at 9:12pm

Science - Disproven Genetic Theory
spontaneous creation
Wednesday, January 29, 2014 at 8:58pm

Science - Disproven Genetic Theory
What genetic theory has been disproven ?
Wednesday, January 29, 2014 at 8:54pm

physical science
How much time is needed for a car to accelerate from 8.0 m/s to speed of 22 m/s if the acceleration is 3.0 m/s^2?
Wednesday, January 29, 2014 at 8:54pm

science
Carbon dioxide is obtained from the air and changed into carbohydrates and oxygen during the process of A) fossilization. B) respiration. C) digestion. D) photosynthesis
Wednesday, January 29, 2014 at 8:53pm

science
It cools slower underground, time for crystals to form in the liquid as it solidifys.
Wednesday, January 29, 2014 at 8:47pm

science
Granite is an igneous rock that forms from magma cooled below Earth's surface.Why would granite have larger crystals than igneous rocks formed from lava cooled above Earth's surface?
Wednesday, January 29, 2014 at 8:41pm

Science ~ Structures and Properties of Matter
http://www.cvsd.org/bowdish/classes/eigh​th_grade/mr_walter/documents/Review%20an​d%20Assessment%20149-151%20Answers.pdf see question 17
Wednesday, January 29, 2014 at 8:25pm

Science ~ Structures and Properties of Matter
How do the principles of convection, conduction, and radiation explain how the water in the saucepan gets hot? Help ME PLEASE! PLEASE
Wednesday, January 29, 2014 at 8:16pm

math
the ratio to the number of mystery books to the number of science fiction books is 4:3 the ratio of the number of science fiction books to the number of biographies is 4:5 if there are 48 science fiction books, find the total number of books using bar model
Wednesday, January 29, 2014 at 7:50pm

history help plzzzzzz
please help me bob. u gave me answers last time for my science
Wednesday, January 29, 2014 at 7:47pm

Physical Science
PE triples
Wednesday, January 29, 2014 at 7:33pm

Science
thanks
Wednesday, January 29, 2014 at 7:31pm

Science
yes, yes, yes.
Wednesday, January 29, 2014 at 7:26pm

Science
1. The combination of sulfur dioxide, nitrogen oxide, and atmospheric moisture creates A. drinking water. B. smog. C. pesticides. D. acid rain. D? 2. Another name for unicellular organisms that dominated Earth up to the Precambrian time is A. eukaryotes. B. cyanobacteria. C. ...
Wednesday, January 29, 2014 at 7:23pm

Physical Science
rth
Wednesday, January 29, 2014 at 6:51pm

Physical Science
How does the potential energy of an object change when its height is tripled?
Wednesday, January 29, 2014 at 6:20pm

science
13.333333
Wednesday, January 29, 2014 at 5:51pm

Environmental Science
conservation today -- especially with irrigation
Wednesday, January 29, 2014 at 4:01pm

Science ~CHECK MY WORK PLEASE~
Are these right
Wednesday, January 29, 2014 at 3:30pm

Science ~CHECK MY WORK PLEASE~
Are these right
Wednesday, January 29, 2014 at 3:30pm

Environmental Science
An effective approach to preventing future shortages of usable water should focus on?
Wednesday, January 29, 2014 at 3:15pm

science(1answer)
Oh sorry, slightly different, train going v for train (1/2) m v^2 = 5,000 * 10^2 for car (1/2) m v^2 = 1300 * 4 * 10^2 = 5,200 * 10^2 so now it is the car number A
Wednesday, January 29, 2014 at 1:55pm

science(1answer)
Now really, I have replied three times now. Yes http://www.jiskha.com/display.cgi?id=139​1014223
Wednesday, January 29, 2014 at 1:50pm

Science
v = Vi - g t 0 = 20 - 9.81 t at top when v = 0 t = 2.04 seconds h = 12 + Vi t -(1/2) g t^2 h = 12 + 20(2.04) -4.9(2.04)^2 h = 32.4 meters
Wednesday, January 29, 2014 at 1:40pm

science (check answers)
http://www.jiskha.com/display.cgi?id=139​1017066
Wednesday, January 29, 2014 at 1:37pm

science(1answer)
4.how does the kinectic energy of a 10,000-kg train traveling at a speed of 10 m/s compare with that of a 2,600-kg compact car traveling twice as fast? A.the train has less kinectic energy than the car. B.the train has more kinectic energy than the car.(I PICK THIS) C.the ...
Wednesday, January 29, 2014 at 1:37pm

science (check answers)
I thought I already replied to this
Wednesday, January 29, 2014 at 1:37pm

Science
A ball is thrown upward at 20 metres per second off the top of a building that is 12 m high. What is the height of the ball above the ground at its highest poin?
Wednesday, January 29, 2014 at 1:15pm

science (check answers)
4.how does the kinectic energy of a 10,000-kg train traveling at a speed of 10 m/s compare with that of a 2,600-kg compact car traveling twice as fast? A.the train has less kinectic energy than the car. B.the train has more kinectic energy than the car.(I PICK THIS) C.the ...
Wednesday, January 29, 2014 at 12:53pm

science(check answers)
(1/2) m v^2 is certainly bigger for the train because (1/2) is the same and v^2 is the same but m is MUCH MUCH bigger so I agree, B
Wednesday, January 29, 2014 at 12:44pm

science(check answers)
2.how would the kinetic energy of a 12,000-kg train compare with the kinectic energy of a 900-kg compact car if both were traveling at the same speed? A.the trains kinectic energy would be equal to the cars kinectic energy. B.the trains kinectic energy would be greater than ...
Wednesday, January 29, 2014 at 12:37pm

science(check answers)
(1/2) m v^2 = 30*900 = 27,000 Joules That is C !!!!
Wednesday, January 29, 2014 at 12:20pm

science(check answers)
i pickerd A.
Wednesday, January 29, 2014 at 12:16pm

science(check answers)
1. A 60-kg cheetah reaches a speed of 30 m/s as it chases its prey.What is the kinetic energy of the cheetah? A.900 j B. 1,800 j C.27,000 j D. 54,000 j
Wednesday, January 29, 2014 at 12:15pm

Science
oh, they were all right anyway!:)
Wednesday, January 29, 2014 at 11:35am

Science
1. Which of the following is true about mixtures? (1 point) Mixtures consist of two or more substances chemically combined. Mixtures cannot be separated by physical means. Mixtures consist of only one kind of atom. ***Mixtures have two or more substances mixed together, but ...
Wednesday, January 29, 2014 at 11:18am

Maths lit,geo,science,l.o,life science,eng
http://www.jiskha.com/display.cgi?id=136​5451782
Wednesday, January 29, 2014 at 10:18am

Maths lit,geo,science,l.o,life science,eng
Im doing those subjects and i would like you guys to help me out...what carrer can i do...im a matriculant im so stressed
Wednesday, January 29, 2014 at 10:00am

Science ~CHECK MY WORK PLEASE~
the first is really wrong. the second is ok
Wednesday, January 29, 2014 at 8:38am

SCIENCE
Which magnets?
Tuesday, January 28, 2014 at 11:52pm

Science ~CHECK MY WORK PLEASE~
A scientist is trying to determine the identity of an element. It is highly reactive in water and forms an ionic bond with chlorine. It is also very shiny. The element is likely A. From Group 17 ********** B. From Group 1 C. From Group 15 D. A Noble Gas Which is most likely to...
Tuesday, January 28, 2014 at 11:31pm

SCIENCE
are these magnetsattracting or repelling each other?how can you tell
Tuesday, January 28, 2014 at 10:29pm

Science
43Lb has a half life of 42 minutes. If you start with 100 grams, how many grams will you have after 84 minutes?
Tuesday, January 28, 2014 at 8:05pm

Science -CHECK MY WORK-
calcium is NOT a nonmetal, it is on the left side of the table. It is reactive..ever get your hands in quick lime? Vandium is not group 4, see this: http://www.webelements.com/ Lanthanum series start at element 57, doesn't it?
Tuesday, January 28, 2014 at 7:53pm

Science -CHECK MY WORK-
Subject: The Periodic Table
Tuesday, January 28, 2014 at 7:42pm

Science -CHECK MY WORK-
a.) How can you describe the location of vanadium (V, atomic number 23) on the periodic table? Choose all that apply. 1. period 5, group 4 <<<My choices>>> 2. period 4, group 5 3. lanthanum series <<<My choices>>> 4. nonmetals 5. transition ...
Tuesday, January 28, 2014 at 7:41pm

Science
You have to make up the adaptations too
Tuesday, January 28, 2014 at 6:57pm

Science
Think of 5 adaptations for a made up animal in an aquatic environment
Tuesday, January 28, 2014 at 6:57pm

Science ~CHECK MY WORK PLEASE~
SO SORRY!
Tuesday, January 28, 2014 at 5:03pm

Science ~ Structures and Properties of Matter
SO Sorry !
Tuesday, January 28, 2014 at 5:03pm

science ~CHECK MY WORK PLEASE~
So Sorry!!!
Tuesday, January 28, 2014 at 5:02pm

computer Science
20 You are trying to boot your computer but your computer keeps displaying a message after the POST that says “'invalid specification”. What does the error mean?” a. an attempt to overclock the primary drive has failed...
Tuesday, January 28, 2014 at 4:43pm

computer Science
18 You started your new job as a PC tech and are at a customer’s house. The computer has failed to boot. The fan is running but the POST fails every time. What is the best thing to do to possibly find quickly? a. Check the electrical outlet the computer is ...
Tuesday, January 28, 2014 at 4:42pm

Science ~CHECK MY WORK PLEASE~
See you other posts. You don't need to post so many under different screen names.
Tuesday, January 28, 2014 at 4:29pm

science ~CHECK MY WORK PLEASE~
See your posts above.
Tuesday, January 28, 2014 at 4:28pm

Science ~ Structures and Properties of Matter
1. C CAN'T be right. Water is a liquid and CO2 is a gas so they dont have the same physical properties and you know they don't have the same chemical properties. 2. see below.
Tuesday, January 28, 2014 at 4:27pm

Science ~CHECK MY WORK PLEASE~
Increasing the density makes it sink. mass = volume x density or density = mass/volume. Increasing v decreases d.
Tuesday, January 28, 2014 at 4:24pm

Science ~ Structures and Properties of Matter
1) Both carbon dioxide and water are pure substances. How are they similar to each other? A. both substances have a set ratio of atoms that cannot be separated by physical means. B. both substances have a set ratio of atoms that can be separated by physical means. C. both ...
Tuesday, January 28, 2014 at 4:12pm

science ~CHECK MY WORK PLEASE~
1) Both carbon dioxide and water are pure substances. How are they similar to each other? A. both substances have a set ratio of atoms that cannot be separated by physical means. B. both substances have a set ratio of atoms that can be separated by physical means. C. both ...
Tuesday, January 28, 2014 at 3:41pm

Science ~CHECK MY WORK PLEASE~
Help Please!!!!!!!!!
Tuesday, January 28, 2014 at 3:34pm

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