Chemistry

which one of the following forces is a contact force force of gravity or force of friction
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what is the percentage composition of carbon and hydrogen in ethane(c2h6,molecular mass 30.0)
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We obviously cannot wait for million years to determine the half-life of technetium, or even years to determine the half-life of plutonium. The half-life of a substance is determined using a Geiger counter, which is essentially a tube filled with an inert gas. When a particle decays and produces radiation, it briefly ionizes the gas and produces a detectable electric pulse, which is amplified and counted by a detector (before digital displays were available, you would hear clicks and see a needle register on a dial). Determine the formula for the half-life of a substance with an initial count of pulses and a count of pulses minutes later.
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3.Plant APlant BIs tallIs shortHas many large deep roots Has many small short rootsHas many small leavesHas many large leavesComes in many different colors comes in only one colorThe table shows some observations made by a group of students studying plants they will usein a flower garden. Which conclusion is best supported by these observations?
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Silver nitrate reacts with calcium chloride asshown.2 AgNO3 + CaCl2 2 AgCl + Ca(NO3)2How many grams of CaCl2 would be required to completely react with 420 mL of0.506 M AgNO3 solution?Answer in units of grams.
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Which of the greenhouse gases are carbon compounds?
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Which equation has x = 5 as the solution?2x = 52x = 5x - 10 = 15x - 10 = 15x + 15 =10x + 15 =102x = 10
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A 30.0 mL aliquot of 0.0250 M HCl solution is titrated using 0.0500 M NaOH.A) determine the volume of NaOH necessary and the pH at the equivalence point.B) Determine the pH of the solution after 160.00 mL base is added.
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How do you find the scientific notation of a Avogadro's number??
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Which reactions are oxidation-reduction reactions? Check all that apply.(1) 2 upper N a plus upper C l subscript 2 right arrow 2 upper N a upper C l.(2) Upper P b (upper O upper H) subscript 2 right arrow upper P b upper O plus upper H subscript 2 upper O.(3)Upper C u plus 2 upper A g upper N upper O subscript 3 right arrow upper C u (upper N upper O subscript 3)subscript 2 plus 2 upper A g.(4)Upper Z n upper B r subscript 2 plus 2 upper A g upper N upper O subscript 3 right arrow 2 upper A g upper B r plus upper Z n (upper N upper O subscript 3) subscript 2.(5)Upper C upper H subscript 4 plus 2 upper O subscript 2 right arrow upper C upper O subscript 2 plus upper H subscript 2 upper O.answer- 1,3, & 5explanation- I did it on edge 2021
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A carrier *Organism that transmits disease through bloodO Person or animal that is infected with the disease but is asymptomaticO Used to treat a bacterial infection, cannot be used to prevent an infectionUsed to prevent a viral infection, must be given before the person is infected
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hlo ;) lol im banned and my name is kimboslicer it is so sad my accout is bloked 4 23:12
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Definition: This is a net gain or loss of electrons.Example: Your hair gains one when you pull a wool sweater over your head.res)Term:
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Where are new volcanoes in the Hawaiian island chain forming
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as insoluble ...... can be separated from a liquid by filtration on centrifugation
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if carbon dioxide is broken down. what element will it give?
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Please answer each question! Due today! Will mark brainliest!1.) How does hydrokinetic energy connect to magnetism?2.) How does hydrokinetic energy connect to circuits?3.) How does hydrokinetic energy connect to magnets?4.) How does hydrokinetic energy connect to electrical charges?5.) How does hydrokinetic energy connect to the parts of waves?
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What is the mass of chlorine in 3.9 x 1019 molecules of Cl2?
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SandbanGrade 8 Science Winter InterimQuestionQ ZoomSigned in as NOTREQ Review Finish TestQuestion>NormalABCQuestion 3Twoiron balls are dropped from a height of 100 meters One Dal Frame A) is not moving when it is dropped and the second ball is moving horizontally at a constant velocity of 10 m/s when it is dropped (Frame B). The balls follow thetrajectories indicated by the arrows and fall for 4,52 s before hitting the ground. (Ignore air resistance)Frame AFrame B1kg-10%10kg
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A weight of 8.7 N is attached to a spring that has a spring constant of 190 N/m. How much will the spring stretch?
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HELPPP HURRY FIRST GET BRAINLEST The rusting of steel wool occurs when the iron in the steel wool combines with what substance?carbon dioxidehydrogennitrogenoxygen
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The process of water changing from a liquid to solid is called?
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True or false: All molecules or atoms in a substance have the same amount of kinetic energy at a given temperature?
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help please i need this
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