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July 24, 2014

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Recent Science Questions

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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 ...
Tuesday, May 6, 2014 at 3:26pm

science
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 make amino acids. The process of ...
Tuesday, May 6, 2014 at 3:06pm

science
Is it ture that air molecules have weaker attractions then water molecules? A.Yes B.No
Tuesday, May 6, 2014 at 2:59pm

Science Plzz Help
1. Which of the following types of joints allows the type of shoulder motion needed by a baseball pitcher to pitch a fastball in a baseball game? A. pivot B. gliding C. hinge D. ball and socket*** 2. Which of the following pairs of joints represents the same type of joint? A. ...
Tuesday, May 6, 2014 at 2:26pm

(5) Chemistry - Science (Dr. Bob222)
Consider a buffer made from 0.13 M sodium acetate and 0.10 M acetic acid in 1L. What amount of KOH must be added to cause an increase of the pH by 0.14? A) 0.048 mol B) 0.038 mol C) 0.028 mol D) 0.018 mol E) 0.008 mol
Tuesday, May 6, 2014 at 2:03pm

Chemistry - Science (Dr. Bob222)
Ammonia is a weak base with a Kb of 1.8 x 10-5. A 100.0 mL sample of 0.13 M aqueous solution of ammonia (NH3) is mixed with 87 mL of 0.15 M solution of the strong acid HCl, calculate the pH of the final solution. A) 2.9 B) 11.1 C) 8.8 D) 5.2 E) None of the above
Tuesday, May 6, 2014 at 1:11pm

science check answer
i think its B. Adding a _____________ to an electric circuit would increase the magnetic field around a wire. A. insulator B. solenoid C. resistor D. conductor
Tuesday, May 6, 2014 at 1:08pm

Chemistry - Science (Dr. Bob222)
How many mmol ( millimoles) of HCl must be added to 130.0 mL of a 0.40M solution of methyl amine (pKb = 3.36) to give a buffer having a pH of 11.59? Thank you for your help!
Tuesday, May 6, 2014 at 12:57pm

science
The study of the Earth's magnetic field is known as
Tuesday, May 6, 2014 at 11:50am

Science
A certain gas expands in volume from 2.0L to 6.0L at constant temperature. Calculate the work done by the gas if it expands,against a vacuum.
Tuesday, May 6, 2014 at 11:03am

science
1.   Use the image below to answer the following question. At which position does the diver have the most potential energy?  (1 point) 1 2 3 4 2.   How does the gravitational potential energy of Coaster A compare with that of Coaster B?  (1&...
Tuesday, May 6, 2014 at 10:48am

science
What can be done to prevent mine drainage from damaging the ecosystem
Monday, May 5, 2014 at 9:20pm

Chemistry - Science (Dr. Bob222)
Posted by Ana on Saturday, May 3, 2014 at 11:23am. A zinc-copper battery is constructed as follows (standard reduction potentials given below): Zn | Zn2+ (0.10 M) || Cu2+ (2.50 M) | Cu Zn2+ + 2 e- → Zn(s) Eº = -0.76 V Cu2+ + 2 e- → Cu(s) Eº = 0.34 V The ...
Monday, May 5, 2014 at 9:19pm

Science
Human blood type is determined by co-dominant alleles. There are three different alleles, know as I^a and I^b alleles are co-dominant and the i allele is recessive. The possible human phenotypes for blood group are type A, type B, type AB, or type O. Type A and B individuals ...
Monday, May 5, 2014 at 7:11pm

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...
Monday, May 5, 2014 at 5:42pm

Career choices
I do maths lit,acco and life science ,what Career should I follow
Monday, May 5, 2014 at 4:59pm

Science
Explain the energy transformations during skydiving? please note: that I need to EXPLAIN!!! Thank you very much in advance...your help is very much appreciated!! x
Monday, May 5, 2014 at 3:35pm

Science
Explain the energy transformations during skydiving? please note: that I need to EXPLAIN!!! Thank you very much in advance...your help is very much appreciated!! x
Monday, May 5, 2014 at 2:56pm

Environmental Science
Subsistence vs. Industrial Agriculture Which type of agriculture is more sustainable? Why
Monday, May 5, 2014 at 2:46pm

Enviroinmental Science
Which type of agriculture is more sustainable? WhySubsistence vs. Industrial Agriculture?
Monday, May 5, 2014 at 2:44pm

science
Which experimental approach would be the most effective and easiest to clearly determine the evolutionary relationship between these 2 organisms? The 2 organisms are a starfish and snake. A. Sequence the same gene in both species to compare their similarity. B. Dissect ...
Monday, May 5, 2014 at 1:10pm

general science
if an object is thrown 60 m into the air and it takes the object 6 s to get there, what's the average speed of the object? (A) 20m/s (B) 360 m/s (C) 100 m/s (D) 10 m/s
Monday, May 5, 2014 at 12:55pm

Science
Which experimental approach would be most effective and easiest to clearly determine the evolutionary relationship between these two organisms? A. sequence the same gene in both species to compare their similarity. B. dissect specimens of both species to look for homologous ...
Monday, May 5, 2014 at 11:23am

science (weather & climaate
Science 6 B - Weather and Climate Unit Test i go 2 conections acedemy
Monday, May 5, 2014 at 6:54am

science
How many DALYs are lost by a person who has a life expectancy of 74, contracts HIV/AIDS at the age of 40 and lives until the age of 60? This person receives antiretroviral medication two years after she/he contracts HIV/AIDS until she/he dies. [The weighting for HIV/AIDS ...
Monday, May 5, 2014 at 3:42am

science
How many liters of a 0.80%\% (m/v{\rm m/v}) NaCl{\rm NaCl} solution can be prepared from 500mLmL of a 9.0%\% (m/v{\rm m/v}) stock solution?
Monday, May 5, 2014 at 12:16am

Science
4. To identify the genotype of yellow-seeded pea plants as either homozygous dominant (YY) or heterozygous (Yy), you could do a test cross with plants of genotype ________. (explain your answer) Do we do a punnet square?
Sunday, May 4, 2014 at 4:43pm

Science
Explain the energy transformations during skydiving Explain what happens once a skydiver reaches terminal velocity please help...i cant find any information...please note that I need to EXPLAIN
Sunday, May 4, 2014 at 3:20pm

Science
What are some ethical issues behind cloning? I already said that some people think cloning is like "Playing God".
Sunday, May 4, 2014 at 2:36pm

Science
GCSE Physics-Forces affecting falling objects. My falling object is a skydiver Can you please help me to find the information needed? Nothing too complicated please. Here is a list of things I need to include but I have no idea where this information can be found on the ...
Sunday, May 4, 2014 at 2:18pm

Science
What happens to the resultant force on each point of the skydive?
Sunday, May 4, 2014 at 1:07pm

Science
Explain what happens when a skydiver reaches terminal velocity? thank you...your help is very much appreciated!!
Sunday, May 4, 2014 at 1:06pm

science
Predicting Table of radioactive isotopes below Isotope type of decay Uranium-238 Alpha Nickel-63 Beta Iodine-131 Beta Radium-226 Alpha With the help of a periodic table, predict the element that forms in each case. Explain your reasoning.
Sunday, May 4, 2014 at 11:50am

Physical science
a swimming pool is 25 m long and 10 m wide and is filled to an average depth of 1.5 m how many kilogram of water does it contain?
Sunday, May 4, 2014 at 11:10am

Science
GCSE Physics-Forces affecting falling objects. My falling object is a skydiver Can you please help me to find the information needed? Nothing too complicated please. Here is a list of things I need to include but I have no idea where this information can be found on the ...
Sunday, May 4, 2014 at 10:52am

science
1. Why do earthquakes occur along the San Andreas Fault? a. Two plates meet at the San Andreas Fault and they slide next to each other causing earthquakes b. Two plates converge at the San Andreas Fault causing earthquakes*** c. Two plates pull apart at the San Andreas Fault ...
Sunday, May 4, 2014 at 1:20am

Science
Some teachers explain that meiosis is actually mitosis happening twice. Is this a correct assumption?Why might teachers say this and is it a true statement? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~​~~
Saturday, May 3, 2014 at 6:57pm

science
Homes near warm climate get a) colder winters b)warmer winters c) cold and warm winters d) none of the above When there is moisture in the air from a hot shower, the water is in which form: a) solid b) liquid c) gas d) all of the above
Saturday, May 3, 2014 at 6:27pm

Science
Some teachers explain that meiosis is actually mitosis happening twice. Is this a correct assumption?Why might teachers say this and is it a true statement?
Saturday, May 3, 2014 at 5:15pm

Science
I need help answering the questions below : Homes near warm climate get a) colder winters b)warmer winters c) cold and warm winters d) none of the above When there is moisture in the air from a hot shower, the water is in which form: a) solid b) liquid c) gas d) all of the above
Saturday, May 3, 2014 at 4:58pm

Science
Can someone help me answer some questions. Homes near warm climate get a) colder winters b)warmer winters c) cold and warm winters d) none of the above When there is moisture in the air from a hot shower, the water is in which form: a) solid b) liquid c) gas d) all of the above
Saturday, May 3, 2014 at 12:54pm

Chemistry - Science (Dr. Bob222)
Ammonium metavanadate reacts with sulfur dioxide in acidic solution as follows (hydrogen ions and H2O omitted): xVO3^–^ + ySO2 → xVO^2+^ + ySO4^2–^ What is the ratio of x : y? A. 1 : 1 B. 1 : 2 C. 2 : 1 D. 1 : 3 E. 3 : 1
Saturday, May 3, 2014 at 12:14pm

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. ...
Saturday, May 3, 2014 at 11:38am

chemistry - Science
A zinc-copper battery is constructed as follows (standard reduction potentials given below): Zn | Zn2+ (0.10 M) || Cu2+ (2.50 M) | Cu Zn2+ + 2 e- → Zn(s) Eº = -0.76 V Cu2+ + 2 e- → Cu(s) Eº = 0.34 V The mass of each electrode is 200 g. Each half-cell ...
Saturday, May 3, 2014 at 11:23am

chemistry - Science
A zinc-copper battery is constructed as follows (standard reduction potentials given below): Zn | Zn2+ (0.10 M) || Cu2+ (2.50 M) | Cu Zn2+ + 2 e- → Zn(s) Eº = -0.76 V Cu2+ + 2 e- → Cu(s) Eº = 0.34 V The mass of each electrode is 200 g. Each half-cell ...
Saturday, May 3, 2014 at 7:30am

Chemistry - Science
A fuel cell designed to react grain alcohol with oxygen has the following net reaction: C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l) The maximum work that 1 mol of alcohol can yield by this process is 1320 kJ. What is the theoretical maximum voltage this cell can achieve?
Saturday, May 3, 2014 at 7:06am

Science
What is a species that has various dominate and recessive trait? What is the cross with the species that shows how the dominant and recessive traits are passed on to offspring?
Friday, May 2, 2014 at 6:57pm

Science
How do sound waves travel between a boat and a submarine in sonar technology? A. Because of water particles. B. Because of water waves. C. Because of water ripples. D. Because of water currents. Is it A?
Friday, May 2, 2014 at 5:49pm

Science question?
How does adaptation explain the patterns of distribution of plant and animal species in the world?
Friday, May 2, 2014 at 5:39pm

Science
Am I correct? Which of the following is an example of human impact on climate changes? • the greenhouse effect • changes in solar output • global warming • changes in the tilt of Earth's axis
Friday, May 2, 2014 at 2:51pm

chemistry chem science
A portable CD player that draws 160 milliamperes of current is powered by Ni-Cd rechargable batteries. Compute the mass of Cd consumed when a disk is played for 35 minutes. (enter your answer in grams)
Friday, May 2, 2014 at 10:37am

Science
Niles Eldredge found evidence in trilobite fossils of a pattern of evolution in which short periods of large change or mixed with longer periods of little or no change. This Pattern Is Called ___________? I'm stumped on this question, can anyone help me?
Friday, May 2, 2014 at 10:29am

Science
How do sound waves travel between a boat and a submarine in sonar technology? A. Because of water particles. B. Because of water waves. C. Because of water ripples. D. Because of water currents. B?
Friday, May 2, 2014 at 12:48am

science
Discuss the relationship between the size and weight of an object and the amount of friction that is present. Sports such as soccer involving running, stopping, jumping, and kicking. Discuss how friction helps players. Please help, I am stuck and confused.
Thursday, May 1, 2014 at 11:30pm

science
Discuss the relationship between the size and weight of an object and the amount of friction that is present. Sports such as soccer involving running, stopping, jumping, and kicking. Discuss how friction helps players. Please help, I am stuck and confused.
Thursday, May 1, 2014 at 10:59pm

science Notes?
What does the term adaptation mean? How does adaptation explain the patterns of distribution of plant and animal species in the world? how matter moves through the biosphere. State how energy moves through the biosphere.
Thursday, May 1, 2014 at 10:14pm

science
In an effort to reduce global warming, individuals and companies have been buying __________________ to fund restorative projects.
Thursday, May 1, 2014 at 7:18pm

science
if new information about the behavior of atoms is discovered and verified, then revisions will need to be made to the current _______ ?
Thursday, May 1, 2014 at 7:05pm

Science
Which of the following demonstrates that reactants and products are chemically different? A. Zn + 2HCl -> 2HCl + Zn B. Zn + 2HCl -> H2 + ZnCl2 C. H2O + C4H10 -> H2O + C4H10 D. C4H10 + H2O -> C4H10 + H2O
Thursday, May 1, 2014 at 7:00pm

science
Johnny left a glass of milk on his bedside table for a week, and it spoiled. at the end of the week, the glass contained a yellow liquid with lumpy white chunks, and there was a terrible order. what can be concluded? A. the milk has undergone a physical change. B. the mass of ...
Thursday, May 1, 2014 at 6:33pm

Asap science check my answer plz?!
Fill in the Blank: 14. The energy role of the first organism in a food chain is always a(n) ___________. A: Producer 15. Water is a(n) __________ factor in all ecosystems that all living things require. A: Abiotic 16. ___________bacteria carry out the conversion of gaseous ...
Thursday, May 1, 2014 at 5:46pm

Pysical science
what is the volume of iron (p=7.9 g/cm3) that has a mass of 0.05kg
Thursday, May 1, 2014 at 5:35pm

science
A 0.63kg{\rm kg} mass vibrates according to the equation x=0.30cos7.00tx = 0.30 \cos 7.00 t, where xx is in meters and tt is in seconds. Determine the amplitude.
Thursday, May 1, 2014 at 5:26pm

science
Which of the following illustrates mechanical weathering? A. Carbonic acid weathers marble limestone B.As plants grow, they produce weak acids that slowly dissolve rock C.Oxidation causes weathering in rock<--- D.Repeated freezing and thawing in rocks causes weathering
Thursday, May 1, 2014 at 3:10pm

science
Which of these statements about saltwater is correct? Saltwater freezes at a lower temperature Saltwater freezes at a higher temperature<--- Saltwater does not freeze at any temperature. Saltwater’s freezing point depends on the temperature of ocean floor
Thursday, May 1, 2014 at 3:05pm

Science
Hello. I need help with science questions. Could you please check these answers for me? Thank you very much! 1. Which of the following traits is acquired A. the number of petals that grow in a plant's flowers B. the wing shape of a wild bird C. the ability of some gorillas...
Thursday, May 1, 2014 at 1:32pm

science
A student is trying to identify the different forms of energy described in the following chart:
Thursday, May 1, 2014 at 11:14am

Science
How much work is done on the trolley by the force,if the force applied is 200N at an angle of 37 degrees to the horizontal and the trolley moves a distance of 10m.
Thursday, May 1, 2014 at 10:26am

8th grade science
If you see that a hot-air balloon is rising above the top of a hill, what is the top of the hill called?
Thursday, May 1, 2014 at 7:59am

science
is that electric current occupies space?
Thursday, May 1, 2014 at 2:11am

science
How are restriction enzymes important tools in genetic engineering?
Thursday, May 1, 2014 at 1:13am

Science(chemistry)
how much energy is needed to change 53 grams of water from -53 degrees celsius to 160 degrees celsius ?
Wednesday, April 30, 2014 at 9:20pm

science
Glucose is a simple sugar made up of carbon, hydrogen, and oxygen. What kind of molecule is glucose? A. Glucose is protein. B. Glucose is a nucleic acid. C. Glucose is an organic molecule. D. Glucose is an inorganic molecule
Wednesday, April 30, 2014 at 5:22pm

life science,maths lit,geography,tourism
is it possible 4 me 2bcum a social worker?
Wednesday, April 30, 2014 at 4:08pm

science
In the ocean, there are areas where there are very few living things. ____________ is the term that describes when this happens to a natural area.
Wednesday, April 30, 2014 at 2:34pm

science
2.Imagine two artificial satellites orbiting Earth at the same distance. One satellite has a greater mass than the other one. Which of the following would be true about their motion?   (1 point) The satellite with the greater mass is being pulled toward Earth with ...
Wednesday, April 30, 2014 at 2:30pm

science
the energy stored in atoms is released when electricity is made with ____________ power.
Wednesday, April 30, 2014 at 1:32pm

science
A homeowner determined that he used 114 gallons of oil every month to heart his home during the winter. this information would be considered part of his ___________________.
Wednesday, April 30, 2014 at 12:55pm

Science
a 5 kg skateboard moves at 7 m/s^2 . What is the force of the skateboard? 35 N<--- 12 2 m/s^2
Wednesday, April 30, 2014 at 11:47am

Science
If a rock weighs 100 pounds on Jupiter, what will it weigh on earth?
Wednesday, April 30, 2014 at 1:06am

Science
If you spin a water-filled cup horizontally on a flat table, did you exert force on the water?
Tuesday, April 29, 2014 at 11:36pm

Physical Science
Which of these cannot increase the strength of an electromagnet? a. making the loops smaller in the coil b. placing an iron bar in the coil c. winding more loops in the coil d. increasing the current in the coil
Tuesday, April 29, 2014 at 11:31pm

Science
a 5 kg skateboard moves at 7 m/s^2 . What is the force of the skateboard? 35 N<--- 12 2 m/s^2
Tuesday, April 29, 2014 at 10:19pm

science
why do cells created by meiosis only have half the number of chromosomes from the original cell?
Tuesday, April 29, 2014 at 6:48pm

science
How does using coal to generate electricity A. using more coal reduces the amount of pollution from using oil <--------------- B. using improves the quality of nearby water C. using coal, instead of wood from trees, helps improve the environment D. using coal releases ...
Tuesday, April 29, 2014 at 5:27pm

science
solar,wind,nuclear,and hydroelectric energy sources are similar in which of the following ways? A. they are all nonrenewable energy sources B. they all require an indirect use of sunlight in order to make electricity C. they are all considered alternative energy sources D. ...
Tuesday, April 29, 2014 at 5:10pm

science
which of the following is used to make biomass fuel? A. coal B. natural gas C. plants and animals waste D. petroleum
Tuesday, April 29, 2014 at 4:41pm

science
Running the dishwasher only when it is completely full is an example of? A. recycling resources B. using nonrenewable resources C. reusing resources D. reducing resource use
Tuesday, April 29, 2014 at 4:18pm

Science
What is the force that results from a 3,000 kg car accelerating at 20.00 m/s^2
Tuesday, April 29, 2014 at 3:18pm

Science
Which of the following would have the greatest force? an object with low mass accelerating slowly an object with low mass accelerating quickly an object with high mass accelerating quickly<--- an object with high mass accelerating slowly
Tuesday, April 29, 2014 at 2:13pm

Science
in a cladogram, a branch point represents a(n)____________ and a branch that ens without leading to living species represents___________. a. common ancestor,;extinction b.mutation; punctuated equilibrium c.extinct species: common ancestor D.common ancestor; speciation
Tuesday, April 29, 2014 at 11:53am

Statistic in Social Science
The verbal part of the Graduate Record Exam (GRE) has a mean of 500 and a standard deviation of 100. Use the normal distribution to answer the following questions: a. If you wanted to select only student at or above the 90th percentile, what verbal GRE score would you use as a...
Tuesday, April 29, 2014 at 2:31am

Science
Please help! Is Mgl2 Magnesium iodide or Magnesium Chloride, I am confused
Monday, April 28, 2014 at 5:58pm

Science
Are the following Ionic, covalent or both? NH4Cl and NaOH Thanks
Monday, April 28, 2014 at 5:35pm

Science chemistry
How much mgs can be obtained from 20g of mg and 20 g of s by the reaction mg+s_>mgs
Monday, April 28, 2014 at 4:34pm

Science. Check Answer
Decided wheather work is being done or not. If it is being down write W. If not write N 1. You throw a baseball a distance of 20 meters. My answer: W 2. You lift a suitcase to put in the overhead luggage compartment of a plane. My answer: N 3. You push against a brick wall ...
Monday, April 28, 2014 at 1:47pm

Math
Ryan left the science museum and drove south. Gabriella left three hours later driving 42 km/h faster in an effort to catch up to him. After two hours Gabriella finally caught up. Find Ryan's average speed
Monday, April 28, 2014 at 9:11am

Science
What contribution does the African elephant make to the world.
Sunday, April 27, 2014 at 11:48pm

computer literacy
1. Which of the following options would return a true statement for the sentence: The sky is bluest early in the morning. (A) Sky and blue Sky not morning Sky or dark Sky and evening 2. Famed science fiction writer H. G. Wells once envisioned something to store vast amounts of...
Sunday, April 27, 2014 at 8:27pm

science/ ms. sue
1. how does oil between machine parts reduce friction ?
Sunday, April 27, 2014 at 8:20pm

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