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August 30, 2014

Homework Help: Science

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Recent Science Questions

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science
1. How is the equator similar to the prime meridian? (1 point) Both the equator and prime meridian are lines that divide Earth into the Northern and Southern hemispheres. Both the equator and the prime meridian are imaginary base lines from which locations of Earth can be ...
Thursday, May 15, 2014 at 1:26pm

Science
Earth travels around the sun at a spreed of 30,000 meters per second. Express this in kilometers per hour.
Thursday, May 15, 2014 at 11:11am

science question
please check i think its B or D. Under which conditions are clouds formed from ice crystals? A.strong winds B.high altiude C.low humidity D.high pressure
Thursday, May 15, 2014 at 10:39am

science
What are lineage bears.
Thursday, May 15, 2014 at 8:35am

Science
Can a recessive trait be a dominant trait as well? I ask this because I have a science problem that says this: A Bb guinea pig crosses with a Bb guinea pig, and four offspring are produced. All the offspring are black. Explain how this could happen. I tried making a Punnett ...
Wednesday, May 14, 2014 at 8:13pm

science
help fill in the blanks please?? Similarities in the early development of chickens and opossums suggest that these organisms share a _________. Niles Eldredge found evidence in trilobite fossils in a pattern of evolution in which short periods of long change are mixed in with ...
Wednesday, May 14, 2014 at 4:26pm

science
how is the equator similar to the prime meridian A. both the prime meridian and equator are lines that divide earth into norther and southern hemispheres B. both the prime meridian and equator are imaginary base lines from which locations of earth can be measured D. both the ...
Wednesday, May 14, 2014 at 3:28pm

science
50 degrees how many ML does it have?
Wednesday, May 14, 2014 at 11:12am

science
A swimmer travels from the south end to the north end of a 30.0 m pool in 15.0 s and makes the return trip to the starting position in 19.0 s. What is the average velocity for the roundtrip?
Wednesday, May 14, 2014 at 10:47am

History,geography,life science,mathematic literacy etc
What other careers are have to be done by a those subject for people who dont have information and thnk they just do them to finish school?.
Tuesday, May 13, 2014 at 10:53pm

science
show me step by step how to balance 2 H3(PO4)(aq) + 3 CaCl2(aq)
Tuesday, May 13, 2014 at 8:28pm

Physical Science
The specific heat of copper is 0.385 J/g.°C. Which equation would you use to calculate the amount of heat needed to raise the temperature of 0.75 g of copper from 7°C to 29°C? a. Q = 0.385 J/g.°C ` (29°C 7°C) b. Q = 0.75 g ` 0.385 J/g.°C ` 29°C ...
Tuesday, May 13, 2014 at 7:48pm

Science
According to Newton’s third law of motion, when a hammer strikes and exerts force on a nail to push it into a piece of wood, the nail (1 point) 1. creates a friction with the hammer. 2. exerts an equal force on the wood. 3. exerts an equal and opposite force on the hammer...
Tuesday, May 13, 2014 at 7:45pm

science
A sample of 8 grams of NaOH is dissolved into 599 mL of aqueous 0.250 M NaOH (assume no volume change). This solution is then poured into 1.68 gallons of water. (You may assume that the two volumes can be added.) What is the concentration of NaOH in the final solution? ...
Tuesday, May 13, 2014 at 7:40pm

science
What volume of ethanol must be diluted with water to prepare 674 mL of 0.854 M solution? The density of ethanol is given as 0.789 g/mL. Answer in units of mL
Tuesday, May 13, 2014 at 7:38pm

Science
Which of the following would have the greatest force? (1 point) 1. an object with low mass accelerating slowly 2. an object with low mass accelerating quickly 3. an object with high mass accelerating quickly 4. an object with high mass accelerating slowly (i picked 3 but im ...
Tuesday, May 13, 2014 at 7:34pm

science
1) why are images produced under the microscope reversed & inverted? 2) why does a specimen need to be centered in the field of view on low power before going to high power?
Tuesday, May 13, 2014 at 6:56pm

science
If a forest ecosystem is removed through clear cutting, their loss is due to _______ my answer is land development. am I correct?
Tuesday, May 13, 2014 at 6:27pm

science
Which of the following statements correctly states how human activity and biodiversity affect one another. A)as humans develop land for homes and industry, biodiversity increases. B)as humans restrict fishing and oil drilling, biodiversity decreases. C)as biodiversity ...
Tuesday, May 13, 2014 at 6:22pm

science 7th grade
Which of the following does not reduce water pollution? a) cleaning up oil and gasoline spills. b)reducing pollutants such as pesticides and fertilizers. c) increasing the use of gasoline. d) properly treating waste water
Tuesday, May 13, 2014 at 2:45pm

science
1. What was henri becquerel studying when he accidentally discovered radioactivity?
Tuesday, May 13, 2014 at 2:28pm

Science
explain air resistance in terms of colliding particles Please Help...nothing to complex please
Tuesday, May 13, 2014 at 12:13pm

science
can u suggest 5 advantages of diffusion and 7 disadvantages of diffusion
Tuesday, May 13, 2014 at 12:26am

Science-Ms.Sue
How did Lamarck and Darwin differ in their thinking about species? A. Darwin thought that organisms could induce their own changes, while Lamarck thought that change could only be induced by an organism's environment. B. Darwin thought that change could occur in individual...
Monday, May 12, 2014 at 9:57pm

earth science
What latitudes are most likely to see glaciers? A. 30° N and 30° S B. 10° N and 10° S C. 45° N and 45° S D. 90° N and 90° S
Monday, May 12, 2014 at 8:42pm

Science
What is the mechanical advantage of the pulley system? The weight is being moved requires a force of 180n. This is the output force. The hand is providing the input force, and is pulling w/45 of force.
Monday, May 12, 2014 at 7:18pm

Science
George was rearranging his bedroom. He moved his booklet 1.5m using 63n of force. How much work did George do?
Monday, May 12, 2014 at 6:53pm

Science 7
Problem; How small is 1 part per million? What will happen to our pure food coloring when we dilute it to 1 part per million using water? What could my hypothesis be?
Monday, May 12, 2014 at 4:19pm

Science: Please check answer
2. Once your rocket reaches space, the captain adjusts the speed. Your captain goes from 24,000 km/hr to 17,000 km/hr over 90 seconds. What is your acceleration? Beginning speed= 17,000km/hr Ending speed= 24,000 km/hr Time it took= 90/sec 17000-24000= -7000/90= -77.778km/hr ...
Monday, May 12, 2014 at 2:34pm

Science
Just wondering for my report, can wood melt in EXTREMELY hot temperatures or turn into another shape?
Monday, May 12, 2014 at 12:33pm

Science? (for dddd47906)
If you follow the directions on the Post a New Question form (did you read them?), you'll have better luck getting a good response. http://www.jiskha.com/post_form.cgi Posted by dddd47906 on Monday, May 12, 2014 at 12:17pm. Just wondering for my report, can wood melt in ...
Monday, May 12, 2014 at 12:30pm

science
can u please explain osmosis,diffusion,fluid mosaic model
Monday, May 12, 2014 at 12:09pm

science
can u suggest 5 advantages and 5 disadvantages of diffusion in chemistry
Monday, May 12, 2014 at 12:02pm

computer literacy
5. Which of the following BEST describes the concept behind Web 2.0? (A) Download Write Read-write Upload 6. The term cyberspace originated where? (A) Science fiction NASA Military University 7. Which of the following is NOT one of Facebook’s main features? (D) Private ...
Monday, May 12, 2014 at 10:45am

science
what happen if blood entering the heart mixed with blood leaving the heart?
Monday, May 12, 2014 at 9:38am

science
a cylinder of diameter 1cm at 30 degrees celcius is to be slid into a steel plate. the hole has a diameter 0.9997cm at 30 degrees celcius. to what temperature must the plate be heated? for steel
Monday, May 12, 2014 at 5:43am

Science 3
What is the current in the circuit if R1=7 R 2 =15, and the voltage is 220 volts? Is the answer 10 amps, 12 amps, 20 amps or 242 amps
Monday, May 12, 2014 at 12:19am

Science
If the voltage is110 volts and the total resistance is 10, what is the measure of the current in the circuit? Is the answer 10 amps,11 amps, 100 amps, or 120 amps.
Monday, May 12, 2014 at 12:11am

Science 2
If the total resistance in the circuit if 18, and the current is 0.5 Amps, what must the voltage be?
Monday, May 12, 2014 at 12:07am

Science 2
If R number 1=7 and R number 2 =5 what is the resistance of the circuit? Answers are 5, 7,12,or 35
Monday, May 12, 2014 at 12:03am

Algebra
You are one of the finalists at a science fair. The scores of the other finalists are 87, 89, 81, 85, 87, 83, 86, 94, 90, 97, 80, 89, 85, and 88. Write an inequality that represents your possible scores if your percentile rank is 80.
Sunday, May 11, 2014 at 11:11pm

science
An advantage of using an electromagnet shown on the crane in the image below instead of a regular magnet to move cars in a junkyard is that an electromagnet can easily be turned on and off
Sunday, May 11, 2014 at 10:32pm

Algebra
You are one of the finalists at a science fair. The scores of the other finalists are 87, 89, 81, 85, 87, 83, 86, 94, 90, 97, 80, 89, 85, and 88. Write an inequality that represents your possible scores if your percentile rank is 80.
Sunday, May 11, 2014 at 8:15pm

(2-8) Chemistry - Science (Dr. Bob222)
Which of the following statements is correct? A) The internal energy of a system increases when more work is done by the system than the heat that flows into the system. B) The system does work on the surroundings when an ideal gas expands against a constant external pressure...
Sunday, May 11, 2014 at 3:59pm

Science
How do I draw a particle diagram to show how ear defenders work?
Sunday, May 11, 2014 at 1:00pm

Science
Hello :) For my assessment tomorrow, one of the things I have to think about is this: "Explained how the ear defenders will work using the Big Idea of Energy Transfer." I have no idea about this at all, please help!
Sunday, May 11, 2014 at 12:46pm

life science
Why do human don't contain Chlorophyll to make photosynthesis and They get Energy but they dont contain chloroplast like a Pallisade Mesophyll ??
Sunday, May 11, 2014 at 12:51am

Science help please
1. Name the components of the respiratory system in the order incoming air would encounter them during breathing. trachea, pharynx, larynx, alveoli, bronchi bronchi, larynx, alveoli, trachea, pharynx larynx, trachea, bronchi, pharynx, alveoli pharynx, larynx, trachea, bronchi...
Saturday, May 10, 2014 at 11:18pm

science
A chemist mixes two liquids together. The reaction produces a gas and a solid. According to the law of conservation of mass, what should the chemist observe when she compares the total masses of the substances before and after the reaction?  (1 point) A.The masses ...
Saturday, May 10, 2014 at 10:36pm

Chemistry - Science (Dr. Bob222)
Liquid chloroform (CHCl3) is placed in a closed container and allowed to equilibrate with chloroform vapor. With the temperature held constant, additional chloroform is introduced into the system, and the vapor-liquid equilibrium is reestablished. Following this, the ...
Saturday, May 10, 2014 at 7:12pm

Science
1. Which of the following describes the correct sequence of the movement of food during digestion? stomach, large intestine, small intestine *** mouth, esophagus, small intestine esophagus, stomach, small intestine small intestine, stomach, large intestine 2. Compare the two ...
Saturday, May 10, 2014 at 4:26pm

Science-3 question
1. Which of the following is not a function of the circulatory system? breaks down large molecules delivers oxygen to body cells **** takes carbon dioxide away from body cells fights infection 2. Which of the following explains why the heart is organized so that it pumps blood...
Saturday, May 10, 2014 at 4:14pm

Science/Math
A water jet approximately 10ft in length & 6-7 inches in diameter traveling @ mach3.5-4.5 hitting an object traveling @ mach 5, 10-15ft in length with a weight of 2500 lbs can its course of travel be altered, and/or can said object be destroyed completely?
Saturday, May 10, 2014 at 12:27pm

(1-22)Chemistry - Science
Consider the following reaction: C(s) + H2O (g) ⇌ CO (g) + H2 (g) (Kp = 0.45 at 900 K) What is the equilibrium partial pressure of H2O when the initial partial pressure of water is 1.00 atm? a) 0.43 atm b) 0.58 atm c) 0.22 atm d) 0.52 atm e) 1.16 atm
Saturday, May 10, 2014 at 10:26am

(1-17)Chemistry - Science
Consider the reaction: SO2 (g) + NO2 (g)  SO3 (g) + NO (g) At T = 1000 K, where the reaction is exothermic with an equilibrium constant K = 9.00 If the reaction vessel is instead charged initially with SO3(g) and NO(g), each at a partial pressure of 0.500 atm, the ...
Saturday, May 10, 2014 at 10:24am

(1-16)Chemistry - Science
Consider the reaction: SO2 (g) + NO2 (g) ==> SO3 (g) + NO (g) At T = 1000 K, where the reaction is exothermic with an equilibrium constant K = 9.00 The reaction vessel is charged initially with all four gases, each at a pressure of 0.5 atm. After equilibrium is achieved, ...
Saturday, May 10, 2014 at 10:23am

(1-15) Chemistry - Science
Assume a gas of molecular mass M g/molecule obeys the Maxwell Boltzmann distribution of speeds at temperature T. If u2> u1, the ratio of the number of molecules at speed u2 to the number at speed u1 a) is always less than one. b) is always greater than one. c) can be either...
Saturday, May 10, 2014 at 10:20am

(1-13) Chemistry - Science
Which of the following effects will make the ratio (PV) / (nRT) less than 1 for a real gas? a) The gas molecules are large enough to occupy a substantial amount of space. b) A large number of molecules have speeds greater than the average speed. c) The gas molecules have a ...
Saturday, May 10, 2014 at 10:19am

1-12. Chemistry - Science
At STP, 3.0 L of D2 reacts completely with 3.0 L of E, producing 1.5 L of a product. What is the formula of the product?
Saturday, May 10, 2014 at 10:17am

(1-11) Chemistry - Science (Dr. Bob222)
Liquid chloroform (CHCl3) is placed in a closed container and allowed to equilibrate with chloroform vapor. With the temperature held constant, additional chloroform is introduced into the system, and the vapor-liquid equilibrium is reestablished. Following this, the ...
Saturday, May 10, 2014 at 8:12am

Science 2
One light year is about 9 trillion kilometers. Arcturus is a star that is 37 light years from earth. If you are about 11 years old now , how old will you be when light that is leaving. Arcturus today reaches Earth ? How far, in kilometers, will it have traveled? Show your work...
Saturday, May 10, 2014 at 12:51am

Science
The columbia icefield is located between banff and jasper in Alberta. It covers an area of more than 300 km squared and has ice that is up to 365 m thick in some places. How can studying this icefield give scientist information on climate patterns Please explain in simple ...
Friday, May 9, 2014 at 6:18pm

Science (Human Population Growth)
How have advances in medicine and technology affected population growth?
Friday, May 9, 2014 at 5:52pm

science
humans depend on natural resources for
Friday, May 9, 2014 at 5:41pm

Science, Chemistry
Hess's law ____. A) makes it possible to calculate ΔH for complicated chemical reactions B) states that when you reverse a chemical equation, the sign of ΔH does not change. C) determines the way a calorimeter works D) describes the vaporization of solids Highly ...
Friday, May 9, 2014 at 3:44pm

Science
What is true about the element francium (Fr, atomic number 87)? Choose all that apply. A) It has seven valence electrons. B) It is likely to form ionic bonds. C) It is in Period 7. D) It is nonmetal. E) It is a metal. I think its B, C, E. Am I right? Please help.
Friday, May 9, 2014 at 1:37am

maTH
I NEED HELP REALLY BAD 5. Directions: Select all the correct answers. Nancy is studying constellations in science class. Two things are strongly supported by all random samples of the number of stars in a constellation. Most constellations have from three to seven stars in ...
Thursday, May 8, 2014 at 11:46pm

Science
Tom is marking the locations of active volcanoes on a world map. Explain how the locations of the volcanoes are related to Earths plates. I am stuck on this and need help.
Thursday, May 8, 2014 at 10:17pm

Science
Is Pb Lead(atomic weight is 82)?
Thursday, May 8, 2014 at 9:27pm

Science
I really need help with This me and my mom are trying so hard! Just click on this link and these are the question I just need the answers to 1 through 14
Thursday, May 8, 2014 at 9:23pm

science
Which evidence from the sea floor shows that tectonic plates move? A) the sea floor is youngest near a mid ridge and farther away. B) the sea floor is much older the cont. C) mid ocean ridges form the longest range of mountains on earth. D) the sea floor is thinner than the ...
Thursday, May 8, 2014 at 8:41pm

math lit ,geography,history,life science,LO
Am in grade 10 and am doing these subjects and I dnt knw what kind of career choice I can choose please guys help me out please
Thursday, May 8, 2014 at 4:34pm

science
the current atomic model would be revised if A. better microscopes were being used to study its structure. B.better microscopes are invented in the future. C. new information about an atom's structure is discovered. D. a new element is discovered in the future
Thursday, May 8, 2014 at 2:51pm

physcial science
Jennifer, who has a mass of 50.0 kg, is riding at 35.0 m/s in her red sports car when she must suddenly slam on the brakes to avoid hitting a deer crossing the road. She strikes the air bag that brings her body to a stop in 0.500 s. What average force does the seat belt exert ...
Thursday, May 8, 2014 at 10:17am

Chemistry - Science (Dr. Bob222)
Nitrogen gas has values of Cv and Cp of 20.8 and 29.1 J K-1 mol-1, respectively. When a certain amount of nitrogen is heated at constant pressure, what fraction of the heat Q is used to increase the internal energy of the gas, and how is the remaining energy used? A) 3/2 of Q ...
Thursday, May 8, 2014 at 8:44am

Chemistry - Science (Dr. Bob222)
Hydrazine is used as a rocket fuel because its reaction with oxygen is extremely exothermic: N2H4(liquid) + O2(g)  N2(g) + 2H2O(liquid) ΔH(reaction) = -615 kJ mol-1 What is the enthalpy of this reaction if water were produced in the gaseous rather than the liquid ...
Thursday, May 8, 2014 at 8:37am

(12)Chemistry - Science (Dr. Bob222)
Calculate delta E for a process in which 88.0 g of nitrous oxide gas (N2O) is cooled from 165 ˚C to 65 ˚C at a constant pressure of 5.00 atm. The molecular weight of nitrous oxide is 44.02 g/mol, and its heat capacity at constant pressure, Cp, is 38.70 J/molK. A) - ...
Thursday, May 8, 2014 at 7:51am

(23.Chemistry - Science (Dr. Bob222)
An electrochemical battery made from Sn and Cu electrodes under standard conditions shows an initial voltage of V= 1.1 V. If the concentration of both Cu2+ and Sn2+ solutions is increased to 2 M from 1 M, the observed voltage will: (Hint: use the Nernst equation) A. increase ...
Thursday, May 8, 2014 at 7:17am

(19) Chemistry - Science (Dr. Bob222)
Use the following information to answer this question: Cu+(aq) + e- → Cu(s) E° = 0.521V Cu2+ (aq) + e- → Cu+ (aq) E° = 0.153 V. Given these half cell reactions, an aqueous solution of Cu+ ion in the absence of O2(g) : A. will be thermodynamically stable B. ...
Thursday, May 8, 2014 at 7:08am

Science
Define " force ". State the correct units for measuring force.
Wednesday, May 7, 2014 at 8:07pm

(11) Chemistry - Science (Dr. Bob222)
In the following hypothetical reaction A + B → C + D, the equilibrium constant, Keq is less than 1.0 at 25°C and decreases by 35% on changing the temperature to 45°C. What must be true according to this information? A. The ΔH° for the reaction is ...
Wednesday, May 7, 2014 at 7:15pm

Chemistry - Science (Dr. Bob222)
The following reaction has a positive value of ΔG°. 2H2O(g) → 2H2(g) + O2(g) Which of the following statements must be true? A. The reaction is slow. B. The reaction will not occur. That is, when H2O(g) is introduced into a flask, no O2 or H2 will form even over...
Wednesday, May 7, 2014 at 7:04pm

science
What is the function of the nucleus in a cell? A. The nucleus controls the cell’s activity. B. The nucleus identifies a cell as belonging to a plant. C. The nucleus determines what substances enter and leave the cell. D. The nucleus can be seen under a transmission ...
Wednesday, May 7, 2014 at 5:28pm

Math Question Please Help
Two more students like math than science Half the number of students who like science like history. The number of student who like reading equals the number who like math and science combined. Two students like History. How many children (12) like each subject
Wednesday, May 7, 2014 at 5:10pm

science
What is the function of the nucleus in a cell? A. The nucleus controls the cell’s activity. B. The nucleus identifies a cell as belonging to a plant. C. The nucleus determines what substances enter and leave the cell. D. The nucleus can be seen under a transmission ...
Wednesday, May 7, 2014 at 4:55pm

science
A transmission electron microscope was used to examine a microscopic organism. No nucleus was found. Which of the following correctly describes the organism? A. The organism is a prokaryote. B. The organism is a eukaryote. C. The organism is not alive. D. The organism should ...
Wednesday, May 7, 2014 at 3:56pm

science
before beginning any land development project, people should carry out a _________ analysis to consider all of the potential impacts of the project on the local ecosystems.
Wednesday, May 7, 2014 at 3:17pm

science
Pennsylvania have made their way down into the Chesapeake bay in Maryland. This is an example of _____pollution?
Wednesday, May 7, 2014 at 3:15pm

science
4. How would increasing the proportion of land (sand) to water affect the amount of water vapor released?
Wednesday, May 7, 2014 at 2:39pm

SCIENCE
1. where does the conversation current in the mantle obtain its heat energy? a. earths core and crust b. earths mantle c. earths core and mantle*** d. earths mantle 2. How do convection currents cause movement of earth's plates? a. The weathering of rocks in Earth's ...
Wednesday, May 7, 2014 at 2:36pm

science
Dust mites are microscopic bugs that are too small to see with a dissecting microscope. To see the details of a dust mite’s skin, which of the following microscopes would you use? A. dissecting microscope B. compound microscope C. transmission electron microscope D. ...
Wednesday, May 7, 2014 at 2:34pm

science PLEASE CHECK MY ANSWERS
1. where does the conversation current in the mantle obtain its heat energy? a. earths core and crust b. earths mantle c. earths core and mantle*** d. earths mantle 2. How do convection currents cause movement of earth's plates? a. The weathering of rocks in Earth's ...
Wednesday, May 7, 2014 at 2:32pm

science
My answers are in the brackets Nitrogen is cycled through an ecosystem by both plants and ?(animals). Decomposers break down dead organisms and their waste products to release ?(ammonia) in a process called ?(nitrification) These ?(decomposers) can then be used by plants to ...
Wednesday, May 7, 2014 at 2:02pm

science
Dust mites are microscopic bugs that are too small to see with a dissecting microscope. To see the details of a dust mite’s skin, which of the following microscopes would you use? A. dissecting microscope B. compound microscope C. transmission electron microscope D. ...
Wednesday, May 7, 2014 at 1:44pm

Science
What determines whether one metal will replace another metal from a compound in a single-replacement reaction?
Wednesday, May 7, 2014 at 1:11pm

science
which of the following is not part of cell theory? A. cells are the building blocks of life B. all living things are made up of cells C. all cells are created from other cells though cell division<------------ D. The nucleus is the control center of the cell
Wednesday, May 7, 2014 at 12:33pm

science
My answers are in the brackets Nitrogen is cycled through an ecosystem by both plants and ?(animals). Decomposers break down dead organisms and their waste products to release ?(ammonia) in a process called ?(nitrification) These ?(decomposers) can then be used by plants to ...
Wednesday, May 7, 2014 at 12:23pm

science
why would Hooke's discovery have been impossible without the invention of the microscope? A. Because all living things are made up of cells. B. Because cells are too small to see without a microscope C. Because cells are the building blocks of life D. Because electron ...
Wednesday, May 7, 2014 at 12:10pm

science
My answers are in the brackets Nitrogen is cycled through an ecosystem by both plants and ?(animals). Decomposers break down dead organisms and their waste products to release ?(ammonia) in a process called ?(nitrification) These ?(decomposers) can then be used by plants to ...
Wednesday, May 7, 2014 at 10:41am

Science
Which of the following occurs during artificial selection, but not during natural selection? A. Selection pressures result in only certain traits from a population being passed on to offspring. B. Traits are passed to offspring through genes. C. Males and females mate and ...
Wednesday, May 7, 2014 at 9:37am

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