Master Chemistry with Fun Quizzes & Brain Teasers!

the size of a marble is an example ofphysical changephysical property chemical change chemical property
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9th grade science need help ASAP
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True or false this model represents an ion
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This chart lists four kinds of polymers and their sources.A 2-column table titled polymer examples. The first column labeled name of polymer has entries D N A, cellulose, nylon, hair. The second column titled source of polymer has entries inside of cells, plant material, synthetic material, animal material.What can be known about all four polymers, despite their differences?They come from living things.They share ionic carbon bonds.They are at least 100 monomers long.They are made of repeating subunits.
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Mitochondria are very important to the cell and are sometimes called the powerhouses of the cell. Imagine that a certain virus penetrates a cell and reaches the mitochondria. Predict what would happen to the cell if the virus were able to destroy all of the cell's mitochondria. A. The cell would eventually die without the ATP that it needs for activitiesB. The cell would be unaffected by the loss of mitochondria and will continue to function normallyC. The cell would rapidly produce more proteinsD . The cell would multiple uncontrollably because there is nothing to stop it anymore.
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Why are prefixes used in naming covalent compounds?
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I need help with this, I'm not understanding.
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Nio conducts a science experiment. He puts yeast into a bottle with water and sugar, and then caps the bottle with a balloon. He returns two hours later and notices there are bubbles on the surface of the mixture in the bottle and that the balloon has inflated, but there are no other apparent changes.What most likely happened?a non-chemical change, because there are no indicators of chemical changes taking placea chemical change, because the mixture changed colora chemical change, because a gas was produceda non-chemical change, because the changes that occurred are reversible
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?The group number tells the number ofElements in the columnNumber of valence electronsO Number of energy levelsO Number of protons in the elements
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What is the length of one mole of the typical cell phone that is approximately 15 cm in length?
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What characteristics do atoms of manganese- 55, iron-56, and nickel-58 have in common?
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How to use system and habitable in a sentence
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Which statement explains why NaBr is classified as a compound?1.Na and Br are chemically combined in a fixed proportion.2.Na and Br are both nonmetals.3NaBr is a solid298 Kand standard pressure.4.NaBr dissolves in H20 at 298 K.SubmitHide Toolbar
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Sugar is added to iced tea and the contents are stirred until all of the sugar dissolves. How would the tea now be classified?
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12. A malleable sheet of metal used to wrap food in the kitchen is made of only aluminum. What can be said about the metal sheet?
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Is it reasonable to expect that the atom model will change again in time?
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11. Which of the following best explains why CO2 gas is easily compressible but solidCO2 (dry ice) is incompressible?The molecules of CO2 gas are much closer together thanthe molecules in dry ice.The molecules of CO2 gas are much smaller than the moleculesof solid CO2OThe molecules of solid CO2 are much closer together thanthe molecules of CO2 gas.The molecules of CO2 gas attract one another, while themolecules of the solid CO2 repel one another.0
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PLEASE HURRY!!! If a substance has a high PH, it will feel__________.If a substance has low PH, it will taste__________.
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Rupert had three substances. A brown substance was a liquid at roomtemperature. He hit each of the other two with a hammer. A blue crystalcracked but did not break. A silver substance flattened but did not crack.Which two statements could be true?A. The brown substance is ionicB. The silver substance is ionicC. The brown substance is molecular D. The blue substance is ionic
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Which types of reactions would result in the production of gas?PLEASE HELP NOW!! worth lots of points
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(EASY!!) What is the name for this structure?
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Please help!!What colors do acids and bases turn litmus paper?
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box a and box b have the same density. box a had more volume. which box has more mass?
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Which of the following would most likely have grains cemented together?a. marbleC. limestoneb. schistd. dioritePlease select the best answer from the choices providedcABD
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