Science

Recent Questions

check my science hw please.
31. Which of the following is an example of a global environmental choice? A. a student deciding to ride a bicycle to school B. a family deciding to recycle their newspapers C. a town meeting about a new nature refuge. D. nations meeting to discuss the ozone layer. I got C as ...

check my science hw please.
30. Laws can help endangered species by prohibiting A. Captive breeding B.habitat preservation C diversity of genes D. products made from the species I got D, I have a feeling that this may be wrong.

check my science hw please.
26. In the last few centuries, the number of species becoming extinct on Earth has A.decreased dramatically B. decreased slightly. C. increased slightly. D.increased dramatically I think it should be C.

check my science hw please.
25. All of the following factors affect an area's biodiversity EXCEPT A. areas B.number of endangered species C. climate D. diversity of niches. I got C for my answer.

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24. can provide an economic benefit to A. drug companies B. tourists C.hikers D.endangered species I got A for my answer.

check my science hw please.
18. Which of the following would be a cost of drilling for oil in Antarctica? A. The supply of heating fuel would be increased. B.There would be a greater opportunity to study wildlife there. C. An oil spill could harm food sources for penguins. D. Many new jobs would be ...

science
10. One group of gases that is responsible for destroying ozone in the ozone layer is A.car exhaust fumes B.CFCs C.nitrogen oxides and sulfur oxides D. Carbon monoxide and carbon dioxide I got B for my answer.

Physical Science
Complete and balance the equation for the following single-replacement reactions. (Use the lowest possible coefficients. Omit states-of-matter from your answer.) Ni + Cu(NO3)2(aq)-->

science
A jellyfish can propel itself with jets of water pushed out of its bell, a flexible structure on top of its body. The elastic bell and the water it contains function as a mass-spring system, greatly increasing efficiency. Normally, the jellyfish emits one jet right after the ...

Religion/ Social Studies/ Science
Please, someone tell me who was it that made the world. Thank you.

science
what is pollution

Science
A 40.0 g block of ice at -15 degrees C is dropped into a calorimeter (of negligible heat capacity) containing water at 15 degrees C. When equilibrium is reached, the final temperature is 8.0 degrees C. How much water did the calorimeter contain initially? Specific heat of ice ...

Science
The acceleration of gravity is 9.8 m/s2 . What is the magnitude of the total force on a(n) 94 kg driver by the dragster he operates as it accelerates horizontally along a straight line from rest to 60 m/s in 8.2 s? Answer in units of kN

science
a rectangle steel block of dimension 10m multiple by 3m multiple by 2m, has mass 45kg calulate the density of the block.

Science
For my science (biology) coursework i am doing an experiment involving photosynthesis- the cabomba experiment. I need to know 1- the variables that are controlled and why 2- what equipment is used and why PLEASE HELP... THANK YOU

English
1. I have to do scince and math homework tonight. 2. I have to do my science and math homework. ------------ Are both grammatical? Which one is commonly used? Do you have other way of expressing?

science
an object has an electric charge of +12. it loses 10 electrons. what is the new electric charge on the object?

SCIENCE
We did a radioactive decay and half life lab with m&ms and I do not understand these conclusion questions: 1. how many half lives would it take for 500 nuclei to decay to 6.25% of the original number of nuclei? My ans: 3125?- do not think that's right! 2. Is there any way to ...

Science
What volume of 0.050M sodium hydroxide is needed to react with 25cm3 of 0.068M ethanoic acid?

environmental Science
the entire area of land that a river drains is called

Environmental Science
what did Thomas Malthus believe

Science Help Please
Which of the following is not among the advantagees of generrating nuclear energy? A.it does not release carbon dioxide into the atmosphere B. it does not require a specialized process or involve any risk C. it does not release chemicals that cause acid rain D. it releases ...

science
explain how mutations in dna affect the traits of an individual

SCIENCE BUT I REALLY NEED HELP
genes are specific sections of ___ To pass its traits on to the next generation, organisms must ____

Science
This will help explain another question I have. So,what is the pattern that occurs when magnetic waves are spread out through the visible spectrum?

Science 1 easy question!!!!
If new information about the behavior of atoms is discovered and verified, then revisions will need to be made to the current___ My answer: Atomic model?

Science 1 easy question!!!!
One way the modern atomic model differs from Thomsons atomic model is that electrons are no longer scattered throughout an atoms positive matter like chocolate chips in cookie dough, instead each electron is outside of the nucleus occupying a specific ______. My answer: Orbital?

Science 1 easy question!!!!
Is K^+1 and F^-1 an ionic bond? My answer: yes

Science!
An index fossil must be? a) older than 1 billion years. b) smaller than other fossils around it. c)larger than other fossils around it. D) unique in its appearance. pleases help someone i don't really know but my best guess is a)

science
what cause sea floor spreading

Science
2 ml of stock antibiotic (64 mg/ml) was diluted into a test tube containing 2 ml of broth (final volume is 4). A series of 2-fold SERIAL DILUTIONS were performed by transferring 2 ml to three other tubes, consecutively (final volumes now 2 ml in each tube). The final ...

science
how many moles of oxygen gas are necessary to form 0.737 moles of carbon dioxide

int.science
The earth can be considered a heat engine because it receives heat from the sun and converts it into mechanical energy to produce winds and evaporate water. True False

chem/science
A piece of an aluminum can was cut into small pieces. Then 0.422 g of the chips from the can was used to prepare potassium alum according to the procedure we used. Calculate the theoretical yield (in g) of potassium alum that could be obtained in the reaction. (Alum MW=474.41 ...

Int.Science/laws of thermodynamics
Watch the heat engine animation in the lesson text above. Does this animation illustrate a "new and improved" heat engine? yes no

Earth Science
Describe the difference in evolution between a supercell that develops in an environment with unidirectional wind shear and a supercell that develops in an environment with veering winds. What is causing this difference in evolution? THANKS!!

science
An athlete executing a long jump leaves the ground at a 27.7∘ angle and travels 7.60m.If this speed were increased by just 5.0%, how much longer would the jump be?

Science
Which of the following electromagnetic waves is not used for communication?

science
just being curious, why does hurricane occur?? thanks

chemistry
The National Institute of Science and Technology (NIST) kinetics database lists the rate constant, k, of a particular gaseous reaction as 8.56× 10–10 cm3·molecule–1·s –1 at 298 K. convert to units of M-1 s-1. convert rate constant to units of Torr-1 s-1. What is the ...

Science PLEASE HELP
How does Exothermic and Endothermic reactions affect the rate of a reaction? Please help. I need something that will be easy for me to understand and adopt into my own words. Thank You :)

science
What r 4 alkali's that u would find in the house????? Luv Sara xxxx

Science
How does Exothermic and Endothermic reactions affect the rate of a reaction? Please help. I need something that will be easy for me to understand and adopt into my own words. Thank You :)

science
Rates of Reactions  I am conducting a experiment on increasing the rate of a reaction by increasing the surface area. For this I am reacting hydrochloric acid and marble chips.  Variables:-  -Independent: the mass of marble chips  -Dependent: The volume of gas  -...

Social Science
Where can I find information on the difference between English policing and American policing, without using wikipedeia? I found some information but is not showing a difference. Thank you

Science
changes in the carbon cycle cause global temperatures to rise how might this affect the water cycle

science
If there is a block of cheese with a volume of 1200 cm, and a mass of 2 kg (2000 g) what would be its mass-to-volume ratio be in g/cm3?

science
which of the following is a characteristic of karst topography? a. caverns b. glaciers c. alluvial fans d. dunes

computer science
What are the Control Identifiers, Domain, in the Layered Security Solution Report?

Science
uncertainty for a tenth of a mm?

Science
what is an uncertainty? From reading the internet, is it a way to express potential error and that the actual value is between +/-#? what would be the uncertainty for this: electronic balance measuring to the tenth of a gram? is it +/- 0.05?

science
an object's resistance to change in motion is called is A. Density B. Inertia C. Mass D. Degrees

science
As an object get farther from earth is A. its weight increase B.it weight decrease C. it mass decrease D. it weight remains the same I am not sure but is it A(or b)

science
which of the following shows the path followed by nerve impulses in a reflex motor neurons,interneurons in brain,sensory neurons or sensory neurons,interneurons in brain, motor neurons

Science Help
Which of the following is not a goal of the clean water act? A. Controlling water pollution from point sources B. Encouraging voluntary cooperation by citizens related to nonpoint sources of pollution. C. Educating citizens about the importance of reducing pollution D. ...

science
4 answers energy flow in ecosystem?

Science Help
Which of the following statements describes the conservation od a natural resource? A. A factory burns coal to run its machines. B. A solar energy company harvests energy from sunlight. C. Lights in a house are turned off when not in use. D. A wind energy company covers a ...

Science Help
Renewable resources are considerered better for the enviorment because A. They are less expensive to harness. B. Once they are harnessed, they can be replaced. C. They do not cause any pollution. D. Using renewable resources encourages people to plant more trees. Is the answer...

Science Help
The process of desertification can occur when A. Plants usually found in the desert replace trees that have been cut down. B. Farmers use contour farming techniques. C. An area of forest is clear-cut. D. An area of forest is selectively cut. Is the answer C? Thank you

Science Help
Which of the following is not a nonrenewable resource? A. Oil B. Petroleum C. Corn D. Gasoline Is the answer A? Thank you

Science Help
Using coal for fuel releases pollution into the atmosphere. Why do people continue to use coal if it causes pollution? A. Using more coal reduces the amount of pollution from using oil. B. Using coal is realtivly inexpensive. C. Mining coal helps scientists unconver fossils. D...

Science Help
Selectively cutting down trees on an area of land can best be describes as A. Cutting down certain trees while leaving other trees standing. B. Cutting down all of the trees and smaller plants. C. Cutting down none of the trees on the land. D. Cutting down ass of the trees ...

Science- Skin
How thick is the epidermis as compared to the dermis as compared to the subcutaneous layer? Is there a comparison? If not, then how thick is the epidermis, dermis, and subcutaneous in thick skin?

science
A swimming pool measures 10m by 7m by 2m calculate the full force exerted by the water against the bottom. What is the pressure at the bottom due to the water?

Int.science
When a motor is turned on, electrical energy is transformed to mechanical energy plus heat energy. True False

Int.science/Laws of Thermodynamics
The outward evidence for this transformation can be seen only in the mechanical motion of the motor. True False

Int.science/Laws of Thermodynamics
The efficiency of the engines in the two previous problems are the same, comparing the input and output temperatures. True False

Earth Science - NEED HELP QUICK
What is the thickness of the layer from 1000 - 850 mb if the mean temperature of the layer is 2 C? From what it says in my textbook it seems as if mb = hPa so all you do is 850 - 1000 = -150 hPa but I am pretty sure that is wrong because what do you do with the temperature?? ...

Science
2 vectors have same magnitude.The magnitude of the resultant vectors is same as either of both vectors.What is the angle between 2 vectors?

science
i have BaCl2.2H2O ,how can i get BaCl2.6H2O from it. or i have CuCl2.2H2O how can i get CuCl2.6H2O from it. actually i am working in the field of nanotechnology. trying to prepare nano-ferrites. now am trying to prepare copper doped barium hexaferrites.help me if u can

Earth Science
Use angular momentum arguments to describe why a parcel of air moving from the equator towards the North Pole will be deflected to the east. It may be helpful to show equations in your response. THANKS

Science
50 ml of ethyl alcohol amd 40ml of water combined in a beaker add up to 90ml of liquid why is this? (Particle theory)

Science/Math Question
So in school, I am doing a " planet paper roll comparison " So the scale of the diameter of one planet is 0.943cm or something.. How do I measure it on paper?

Science
What would happen if cells didn't have the following? : -Nucleus -Ribosomes -Endoplasmic Reticulum -Cell Wall

science
Two train cars are connected to a locomotive as shown. Wach train has a force of kinetic friction equal to 50,000N. The locomotive pulls the two freight cars at a constant speed of 4.0m/s. Find the force of tension at each of the coupling points A & B.

Earth Science
Use angular momentum arguments to describe why a parcel of air moving from the equator towards the North Pole will be deflected to the east. It may be helpful to show equations in your response.

5th grade science
what does the statement "the properties of salts are different from the properties of the elements"mean.

Science help URGENT
Muscles located in the walls of the small intestine help push digested material along. Muscles located in the walls of arteries help push blood along. Based on this information and your understanding of muscle types, which of the following statements is correct? Both sets of ...

science
any science projects??? please help!!!

int.science gtg in 8 min.
How much heat is contained in 100 kg of water at 60.0 °C? Be mindful of significant figure rules for both multiplication and addition. 30 kcal 2.10 x 104 kcal 2.40 x 104 kcal 2.77 x 104 kcal

Int.Science
How much energy is needed to heat and melt 3.0 kg of copper initially at 83°C? Be mindful of significant figure rules for both multiplication and addition. 450 kcal 430 kcal 280 kcal 130 kcal

Science Help!!!!
One reason people around the world use coal as an energy source is A. It is nonrenewable B.it can be found many places C.it is a fossil fuel D. It cannot be used up Is the answer C?

science
How do you peel a boiled egg with the shell sticking ?

Earth Science
What two types of air masses collide to form a dry line? On which side of this boundary would you expect to see rising motion, and why?

Science
Someone please help me. :( Compare your models of the four haploid cells with those of other groups. Describe and explain any variation that you observe.

Science
What force do you need to push on a large crate to accelerate it at 1.8m/s2 across a rough floor? The crate has mass 32kg and the coefficient of kinetic friction between the crate and floor is 0.57

Science
1. A student lifts his 2.0-kg pet rock 2.8m straight up. He then lets it drop to the ground. Use the Law of Conservation of Energy to calculate how fast the rock will be moving ..... a. half way down b. just before it hits the ground 2. A 65-kg girl is running with a speed of ...

6 grade science
Which is not an example of stimulus A. the smell of baking bread B. the sound of your alarm clock in the morning C. the scream you give when someone scares you d.the light from the sun I think it is C. because the scream is the reaction to the stimuli, someone doing the ...

Science Technology
How was the camera developed ? ( Who made it )

science
What provides pure O2 for inhaling and canisters to collect CO2 CO2.

Science Technology
Originally the camera was made to capture a moment in time quickly and exactly. Paintings often reflected the opinion of the painter in their art, however, photos show exactly what was happening. Photos can be biased but nonetheless they are real. Photography started becoming ...

Science Technology
Can someone give me a brief explanation to why Cameras were developed ? Please make it short and simple.

earth science
The active sections that are located along fault lines are called

science
Name the substance that makes bones flexible

Science biodiversity(asap please!)
The panther(species Puma concolor coryi) lives in Florida. At present, there are fewer than 100 of these panthers living in the wild, and the species is considered endangered. A controversial breeding program has been set up that s moving females of a subspecies of panther, ...

science
at 30 degree celsius , the solubility of ag2co3 (Ksp= 8 * 10^-12) would be maximum in 1 litre of ? a) pure water b) 0.05 M NH3

Earth Science
List 3 distinguishing features found near a frontal boundary. Thanks

science
Q: You find a clear substance that has a definite shape. What form of matter is the substance? A: Solid (Is this right)

english
need help on writing science fiction short story?

physical science
A 3Kg bar of aluminum has to be heated form 25 degreesC to 75 degreesC . how many calories are needed to achieve this temperature increase?

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