Chemistry

Question 3 of 105 PointsMatch the approximate percentage of the world's water to where it is stored.Salt water97 percentIce caps andglaciers2 percentFresh liquidwater1 percent
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Which of the following statements is true?Sound vibrations are changed into electrical impulses by the eardrum.It is dangerous to listen to sounds over 160 dBs.High-pitched sounds have low frequencies.All of the above.
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Explain the effects that different frequencies of electromagnetic radiation have when absorbed by matter.
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An exothermic reaction releases 13,450J of heat. How many calories of energy are released? A) 5 56,274 calories B)1,244 caloriesC) 134,500 caloriesD) 3,215 calories
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Which of the following compounds contains covalent bonds? *CsOFeONaClCCl
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How many oxygen atoms and are present in this water molecule 2H2O? (note* the number 2 after H is a subscript)
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help me name these molecules please
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Relate dark matter to the development of the universe after the Big Bang. In 3-5 sentences, speculate on how the development of the universe would have been different if there had been no dark matter. In your answer, use the term structures.Please answer if you do i will mark you as brainliest
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After constructing the circuit, Aliyah and Jeremy noticed that the light bulb stays on all the time. This means the batteries will get used up when the flashlight does not need to be on. What is something Aliyah and Jeremy can do to solve this problem?
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How is the atmospheric oxygen that is taken in by living things for respiration replaced?A) After living things use oxygen for respiration, they exhale the oxygen back to the atmosphere.B) Photosynthesis uses the carbon dioxide that is exhaled by living things to make oxygen.C) Weathering releases oxygen that is locked in rocks due to sedimentation.D) Oxygen that is dissolved in water such as oceans is released.
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What volume of 0.125 M HCl is needed to titrate 50.0 mL of 0.0500 M NH3 solution ?
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Whats the two products of H2Co3
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Problem PageQuestion Sulfur dioxide and oxygen react to form sulfur trioxide during one of the key steps in sulfuric acid synthesis. An industrial chemist studying this reaction fills a 500. mL flask with 1.3 atm of sulfur dioxide gas and 4.1 atm of oxygen gas, and when the mixture has come to equilibrium measures the partial pressure of sulfur trioxide gas to be 0.91 atm. Calculate the pressure equilibrium constant for the reaction of sulfur dioxide and oxygen at the final temperature of the mixture. Round your answer to 2 significant digits.
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Anatom that has lewer neutrons than protons and more electrons than protons is
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The ___________________ is an early theory which states that our solar system was formed by the gravitational collapse of a massive giant cloud.A)Nebular TheoryB)Capture TheoryC)Proto-planet TheoryD)Schmidt-Lyttleton accretion theory
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0Why does a hot water bottle feel warm?Molecules in the hot water bottle aremoving faster than molecules in the skin.Molecules in the skin are moving fasterthan molecules in the hot water bottle.DONE
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Picture of 2010 Todd Abronowitz Gas Laws problems, super fun if youre in AP chem. Can you help a pre-AP struggling student out please?
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The balloon in this image was rubbed with a piece of wool material. Now, it is negatively charged. What force allows the charged balloon to "pick up" the small pieces of paper off of the table?The negatively charged balloon is attracted to negative static charges in the paper..The negatively charged balloon is attracted to the north pole of the paper pieces.The negatively charged balloon is attracted to the south pole of the paper pieces.The negatively charged balloon is attracted to the positive static charges in the paper.What is the best explanation of electric current in a wire?Electrons build up in the wire and create a charge.Electrons flow because of electrical attraction and repulsion.Protons are pushed along by electric forces.Atoms move because of heat.Why does the light bulb in a circuit turn on when you close the switch?The switch absorbs the electrical energy.The switch changes the direction of the flow of electrons.Closing the switch completes the circuit, making it a closed circuit.The switch changes the circuit from series to parallel.Earth is dipolar, like a bar magnet.What does this mean about its magnetic poles?There is only a magnetic south pole.There is only a magnetic north pole.There are both magnetic north and south poles.There are two magnetic north poles.Which arrangement described below would result in magnetic poles that attract one another?North Pole + South PoleSouth Pole + West PoleEast Pole + North PoleNorth Pole + North PoleWhy is an electromagnet a temporary magnet?An electromagnet only attracts other permanent magnets.An electromagnet becomes a magnet when a current flows through the wire. An electromagnet no longer acts as a magnet when the current flow stops.An electromagnet cannot be turned on and off.An electromagnet is a magnet when no current flows through the wire. The electromagnet no longer acts as a magnet when current flows through the wire.What set of materials listed below could be used to create a complete electromagnet?wires and batteryiron nail and batteryiron nail, magnet, and wirebattery, iron nail, copper wireWhere is a bar magnet's magnetic field the strongest?red part of the magnetlongest part of the magnetmagnetic poles (N + S)center of the magnetA(n) ___________ is represented in the diagram it converts electrical energy into mechanical motion.generatorelectromagnetparallel circuitmotor
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Sometimes in the lab we collect the O2gas formed by a chemical reaction over water (see sketch at right). This makes it easy to isolate and measure the amount of gas produced. Suppose the gas evolved by a certain chemical reaction taking place at 55.0C is collected over water, using an apparatus something like that in the sketch, and the final volume of gas in the collection tube is measured to be 117mL. Calculate the mass of that is in the collection tube. Round your answer to significant digits. You can make any normal and reasonable assumptions about the reaction conditions and the nature of the gases.
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PLEASEEEE help! BRAINLIEST to right answer!!!!
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What specifically do vaccines contain which cause your body to becomeimmune to specific pathogens? *
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A solution that has a large amount of dissolved solute is called
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Help Chem asap!!!!! Brainslist
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Two friends are arguing about the structure of the universe. Caleb says that the universe is made of many galaxies that aremade of millions of stars and many galaxies that are made of millions of planets. Maria says that he is wrong becausegalaxies like the Milky Way are made up of millions of universes with millions of stars.Which best describes the error(s) that were made in this conversation?Caleb is incorrect when he says that some galaxies are made of stars and some are made of planets, and Maria isincorrect when she says that the Milky Way is a galaxy.Maria is incorrect when she says that galaxies are made up of universesCaleb is incorrect when he says that some galaxies are made of stars and some are made of planets and Maria isincorrect when she says that galaxies are made up of universesMaria is incorrect when she says that the Milky Way is a galaxy
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