1. Science
    How many atoms are there in one molecule of the following compounds? a. silver chloride- AgCl b. calcium oxide- CaO c. Magnesium nitride- Mg3N2 d. Aluminium oxide- Al2O3 e. Scandium sulfide- Sc2S3 f. Hydrogen Peroxide- H2O2
  2. Science
    Why is it important for scientists, who communicate with each other all over the world, to have a uniform set of chemical symbol?
  3. science
    A car attains 54km/hr in 20 seconds after it start from rest. Find the acceleration of car.
  4. science
    A boy travels a distance of 10m towards south and then he runs towards east and travel 12m in that direction. Calculate yhe total distance travelled by the boy and displacement from his initial position.
  5. Science
    A homeowner determined that he used 114 gallons of oil to heat his home during game the winter. This information would be considered part of his ________?
  6. Science
    The coinage metals - copper, silver, and gold - are considered to be a chemical family. List three arguments to explain why. Please help!!
  7. science
    a scorpion stalks, kills and then eats a spider, based on its behavior what ecological term describes the scorpion? a) producer, herbivore, decomposer b)Producer, carnivore, heterotroph c)Predator, carnivore, consumer d) Predator, autotroph, herbivore
  8. Science
    The closer together magnetic field lines are, the The magnetic force A closer B farther C stronger D weaker
  9. forensic science
    Identification is the examination of chemical and physical properties of an object and using the results to categorize the object as a member of a group. Which of the following are examples of identification? Determination that hairs found on a bag are from a cat Determination...
  10. science
    A cube has each edge equal to 2cm.Mass of cube is 20.8 g.what is its volume and density
  11. Science
    Two forces acting in the opposite direction have a resultant of 10N. If they act at the right angles to each other the resultant is 50N .the magnitude of the forces are
  12. Science
    If A vector = B vector + C vector and the magnitude of A,B and C are 5,4 and 3 units respectively the angle between A and C is
  13. Science
    If three vector A.B and c are 12,5,13 in magnitude such that c vector = A vector + B vector ,then the angle between A and C is
  14. Science
    Two forces have magnitude in the ratio 3:5 and the angle between their directions is 60°. If their resultant is 35N their magnitude are
  15. science
    Which sequence shows the correct order of Earth’s geologic time intervals from oldest to youngest?
  16. Science
    If I made an electromagnet what would the variables be. controlled, dependent and independent
  17. Science
    Table salt has a solubility of 36g of salt in 100g of water at 40 degrees celcius. If 15g of salt is added to 50g of water at the same room temperature, is the resulting solution saturated of unsaterated? Explain your answer.
  18. forensic science
    What is a trier of facts? Only a trial by a jury the party or parties determining guilt or innocence only a trial by a US Superior Court magistrate the determination of guilt or innocence by an elected official the complete summary of all evidence in a case
  19. physical science
    Do the following substance desosolve in water? Give a reason for answer A) Ethanol B) Iodine
  20. physical science
    Why does liquid substance have the same meniscus shape
  21. Science
    How much retardation must be applied to stop a bus running at a uniform speed of 40km/h in 5 seconds?
  22. science
    Describe how you would separate a mixture of sand, iron fillings and granulated sugar
  23. Physical science
    Which of the following homogeneous and which are heterogeneous? Blood, carbon dioxide,Rock, steak,iron, concrete, air,oxygen, salt, milk.
  24. science
    name the metals and non metals present our body
  25. Science
    A solution contain 40 centimetre cube of alcohol mixed with 150 cm cube of water calculate the concentration of the solution
  26. Science
    To make a saturated solution 37 gram of aluminium chloride is dissolved in 10.0 gram of water at 293 K find it concentration and this temperature?
  27. science
    A scientist is examining a multicellular organism that has a cell wall. What kingdom does this belong to? a. Fungi b. Animalia c. Plantae d. Eubacteria i believe that its a
  28. science
    The process that creates cells with different genetic combinations is a. asexual reproduction b. mitosis c. cell fission d. meiosis i believe its d?
  29. science 7b tecca
    which of the following ussually causes creep? volcanic activity low water content plate tectonics*** freezing and thawing of water beneath the soil.
  30. science
    A bottle full of water has mass of 100g. when the same bottle is filled with luquid X, its mass is found to be 80g.If the mass of an empty bottle is 50g, calculate the density of the liquid?
  31. science
    What is the main function of glycoxisomes (is organell) ???
  32. science
    When limiting factors ________, diversity in populations _________. a. decrease; decreases b. increase; increases c. increase; decreases d. increase; stay the same i think it is a
  33. Physical science CHECK my answers
    1. What is the smallest part of all matter called? (1 point) * a. Element b. Atom*** c. Molecule d. Compound 2. Which of the subatomic particles is negative? (1 point) a. Nucleus b. Neutron c. Proton d. Electron***** 3. Who provided the first evidence that atoms contain ...
  34. science
    following balanced chemical reaction: Ca2+ (aq)+ CO3 2-- (aq) ⇄CaCO3(S) The amount of dissolved CaCO3 can be increased on adding: CaCO3(S) KNO3(S) Na2CO3(S) CH3COOH(S)
  35. Science
    I have to make an experiment that supports the hypothesis that light travels in straight lines except at the point it enters a new medium and i was wondering if somebody could help me out by sending some links for ideas because ive been stuck for a while thanks! heres the ...
  36. Basic Geology
    I need help with a Science essay. The question reads: "Hannah is comparing a rock from a riverbed and a rock from deep underground. One is very smooth, and the other has very rough edges. Explain why each rock was probably found in that location." In order for me to receive ...
  37. math
    As part of a school science project, Jacob bought some bulbs for a total of $18. The cost of each bulb was $3. How many bulbs did Jacob buy? Write an equation with a variable and state what the variable represents.
  38. science
    State a suitable hypothesis for this investigation
  39. Science
    Write balanced chemical reaction of the following- Stem is passed over heated iron to form magnetic oxide of iron and hydrogen.
  40. Math & science
    If a car slows down from 15m/s to rest in 5 seconds calculate retardation
  41. Science (Geology)
    I am doing an assignment on the rock quartzite, and I cannot find any information as to what rock comes after quartzite in the rock cycle (What rocks are formed from quartzite)? Help would be much appreciated.
  42. science
    The temperature is 66 degrees Fahrenheit. You drop a stone in a well. It hits water. You time this event: 4.6 sec. How deep is the well?
  43. social science
    State a possible hypothesis for this investigation.
  44. Science/chemistry
    CH4 + 2O2 --> OC2 + 2H2O What mass of water is formed by burning 4g of methane in excess oxygen? (Ar of carbon=12, Ar of oxygen=16 and Ar of hydrogen=1)
  45. science
    what measures the quantity of matter
  46. Science
    How dos the pull of a magnet work PLEASE ANSWER I NEED TO TURN THIS IN BEFORE JUNE 9th thank you!!
  47. Science
    Earth’s energy sources include both renewable and nonrenewable resources. Name at least three sources of energy that could be used in your house. Then describe the ideal energy source for generating most of your home’s electricity, and explain why you chose that source. I ...
  48. science
    i want a few examples of true solutions.
  49. Science
    A body that uniformly retarded comes to rest in 5.0s after travelling a distance of 10.0m. Calculate the retardation and initial velocity
  50. Science
    The green revolution depended on A) new biodegradable pesticides. B) high-yielding grain varieties. C) clearing forest for crop land. D) organic fertilizers.***
  51. Math
    There are 36 books on a bookcase.there are 9 nonfiction,12 fiction,and 15 science fiction. What is the probability of choosing a nonfiction book of choosing a fiction book of choosing a science fiction book?
  52. science
    2C3H6+2H2+N2+5O2→2CH3COONH3+2CO2+2H2O WHY?
  53. math science geography
    A resultant force of 15.00n acts on a body for 4s mass 4kg. calculate the change in momentum of the body within this period
  54. chemistry (science)
    explain the observed temperature change upon mixing ethanol and cyclohexane.
  55. science
    the_____ biome is characterized by its lack of trees warm tempeture and moderate rainfall nitrogen fixing am i right
  56. science
    the energy role of the first organism in a food chain is always
  57. science
    what does native americas not use tortora reed for
  58. Science
    How do global positioning systems use elevation points on Earths system to find latitude and longitude A. By using signals from a network of satellite B. By using topographic maps C. By using satellite images D. By using photography
  59. Science
    Do global positioning systems use elevation on Earths system to find latitude and longitude A. By using signals from a network of satellite B. By using topographic maps C. By using satellite images D. By using photography
  60. Science
    1. How Ian an areas topography determined? A. By using an areas longitude and latitude B. By using an areas scale C. By using an areas elevation, relief, and landforms * D. By using an areas elevation, longitude and latitude I really need to check my answers if anyone can help...
  61. Science
    Explain the law of motion needed to solve this problem and then solve it. On Planet Zorg, a 30 kg barbell can be lifted by only exerting a force of 180 N. What is the acceleration of gravity on Planet Zorg? Predict how the motion of this object would change if on Earth.
  62. Science physics
    mandy drops a 2.0kg book from a height of 4.5m. how much work has gravity done on the book? M=2.0kg D= 4.5m Not actually sure what to do next. Because none of the formulas work. I need work but I don't even know the force. To find force I need mass which I have but I don't ...
  63. Science
    I need help on this letter. You do not have to give me full answers but if you do give me a full answer, I will use it but edit it into my own words. Now it is time to apply and share what you have learned so far about energy sources. After completing the U.S. Overview ...
  64. Science
    When iron is heated with sulphur, iron sulphide is formed . Name the reaction
  65. Science
    A bicycle and its rider have a combined mass of 90kg. The cyclist is accelerating at 0.5m/s^2. What minimum force is he exerting? F=m•a F=90kg•0.5m/s^2 F= 45N However the answer on my answer key says 5×10^1
  66. science
    A ball is thrown from a height of 10m with certain initial downward velocity. It hits the ground and loses 50% of its energy during the impact and rises back to the sane height. What was its initial downward velocity of projection?
  67. science
    calculate the work done in moving a mass of 50 kg from one point to another point if the gravitational potential diffrence between these two points is 2*10^3j/kg
  68. Re-post Langauge arts
    Plugged In, but Tuned Out: The Evil Influence of the MP3 Player Darrell Thomas I. Invasion of the Body Snatchers: Have you noticed a change in the world around you recently? Have you seen how more and more people are walking around with little white rectangles in their hands ...
  69. Science
    What is The Coriolis Effect?
  70. Science
    A cave explorer is surveying the cave. He follows a passage 100m straight east, then 50m in the direction 30degree west of north, then 150m at 45degree west of south. After fourth unmeasured displacement he finds himself back where he started. Whats the fourth displacement? In...
  71. Science
    Can someone help me/check with this work? 1. _______ is the rate of change of position. A.Speed***** B.Velocity C.Acceleration D.Deceleration 2. Which of the following is the difference between speed and velocity? A. direction***** B.units C.speed D.none of the above 3.A ...
  72. Science
    Calculate the mass of iron, which will be convert, into its oxide(Fe3O4) by the action of 18g of steam on it (A)21g (B)42g (C)64g (D)51g
  73. Science
    A battery of emf 10volt is connected to resistances as shownn in figure . The pitential difference between the points A and B is what ?
  74. Science
    What is an example of a stable system? How were you able to determine whether or not this system is stable?
  75. science
    why are you guys posting questions without the answers to them
  76. Science
    You are to choose four landforms for your research. As you complete the research on your chosen landforms, be sure to gather these details: the landform's locations the process/processes that formed the landform facts about the landform ways in which the landforms ...
  77. MJ Science 3
    Which of the following is not a property of a metal? Luster Malleability Permeability**** Ductility
  78. MJ Science 3
    Q 1 A geographical area where plants, animals, the landscape, and the climate all interact together is called a(n) environment ecosystem**** biome food web Question 2(Multiple Choice Worth 4 points) The process of sharing electrons between two atoms is called metallic bonding ...
  79. MJ Science 3
    Q 1 A geographical area where plants, animals, the landscape, and the climate all interact together is called a(n) environment**** ecosystem biome food web Question 2(Multiple Choice Worth 4 points) The process of sharing electrons between two atoms is called metallic bonding ...
  80. Science
    Which of the following is the suns visible surface layer? The core The radiation zone The convection The photosphere*** I tryed looking in my notes but I can't find it and this is on my test can you please tell me if im right?!?!
  81. Physical Science
    An isotope of radon gas, Rn-222, undergoes decay with a half-life of 3.8 days. How long does it take for the amount of Rn-222 to be decreased to one-sixteenth of the original amount?
  82. Science
    Compare and contrast one of the outputs with one of the side effects.
  83. science
    A transverse wave has an amplitude of 5 cm, a frequency of 60 Hz and a distance from crest to next trough of 15 cm. Identify the wavelength of this wave. Please someone help asap I cant figure this out. Is there a formula?
  84. science
    which substance has a melting point of -219 degree celsius and boiling point of -183 celsius at room temperature 30 degree celsius
  85. Science
    A biologist studying a desert ecosystem observes that the population of a lizard species increases following a particularly hot, dry period that causes a snake population to decline. What could the biologist hypothesize about the roles of these two species? A.The lizard preys ...
  86. Science
    Fertilizers And Pesticides Applied To Farm Fields In Pennsylvania Have Their Way Down Into The Chesapeake Bay In Maryland This Is An Example Of __________ Pollution. Answer: I was thinking it is either nonpoint source or point source
  87. Science#2
    How do ocean currents influence the climate of a place? A) They transport heat over large distances, affecting the wind that blows over the land. B) They bring cold water from the poles, reducing the temperatures along the coasts. *** C) They draw out moisture from the wind, ...
  88. Science
    Jupiter, Saturn, Uranus, and Neptune: what is one reason why life probably does not exist on these four planets? A) They have no gravity. B) They are the gas planets. C) They are the giant planets. **** D) They are the rocky planets. Earth seems to be the only planet in our ...
  89. Science
    why is using a ramp to load a heavy object into the back of a moving truck easier than lifting it in?
  90. Science
    An archer fires an arrow, by applying an average force of 182 N across a distance of 38.0 cm on the bow. If the arrow has a mass of 22.0 g, find its velocity when the archer releases the bow: a)if the conversion is 100% efficient. b)if the conversion is 77.0% efficient.
  91. Physical Science 9th grade
    Could someone please explain how I do this or provide a link explaining how. I am very confused. 1) a) Name 2 properties of waves that change if the wave changes media. b) Name a property that does NOT change when it changes media. 2) If the wavelength of a wave increases when...
  92. science help only have 3 min left
    Earth seems to be the only planet in our solar system that can support life. All BUT ONE of these is a reason why life is found only on Earth. That is A) a moderate climate. Reactivate B) the presence of water on Earth. C) it is the perfect distance from the sun. D) it has ...
  93. Science
    person is watching through a window of an apartment sees a ball that rises vertically upward and then vertically down for a total time of 0.5 seconds. if the height of the window is 2 metre, find the max height above the window reached by the ball
  94. Moon Science
    What causes the phases of the moon as observed from the Earth? A) Filtering of the light from the moon due to the Earth's atmosphere. B) The tidal forces of the Earth's oceans change the appearance of the moon. C) Change in distance of the moon from the Earth as it orbits in ...
  95. Science
    A meteorite is DIFFERENT from a comet mainly because has a tail of ice and dust enters the earth's atmosphere*** has a nucleus made of snow and rock is found in the orbit between Mars and Jupiter
  96. Science
    A hurricane becomes more powerful be evaporating water from? lakes mountains oceans*** rivers 1. Over time, scientists have changed their model of our solar system. It has transitioned from A) a sun-centered to an moon-centered model. B) a sun-centered to an earth-centered ...
  97. Science
    The sun's apparent motion across the sky from East to West daily is due to the A) rotation of the sun. B) rotation of the earth.*** C) orbit of the earth around the sun. D) orbit of the sun around the earth
  98. science
    Cobalt-60 has a 30 year half-life. How much of an 80 gram sample would remain after 60 years?
  99. Science
    Nathalie pushes on the pedals of his bike with a 320N force. If the bike has a produced force of 640N, what is the mechanical gain of the bike?
  100. CHECK my answers Physical science
    10. If a solid piece of iron is heated and remains at 80°C until it is completely melted, you know that 80°C is (2 pts) * a. the freezing point of iron b. the melting point of iron c. the boiling point of iron d. both the freezing and melting points of iron my answer would ...
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