Master Chemistry with Fun Quizzes & Brain Teasers!

what characteristic of a solid is most responsible for their structure? select all that apply. the elements that make up the solid ability to withstand scratching bonding patterns between atoms amount of kinetic energy it can absorb before breaking
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describe the differences between electron transfers involving organic molecules that act as electron carriers (nad /nadh, fad/fadh2, q/qh2) and transfers involving the metals that act as electron carriers (fe2 /fe3 , cu /cu 2) in electron transport
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When some of the sugar added to iced tea remains undissolved at the bottom of the glass, the solution is Most studied answer a) dilute b) unsaturated c) saturated d) polar e) nonpolar
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What are the spectator ions in the reaction between aqueous hydrochloric acid and ammonia?
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5. A solid consists of a mixture of NaNO3 and Mg(NO3)2. When 6.50 g of the solid is dissolved in 50.0 g of water, the freezing point of the solution is lowered by 5.23C. What is the composition by mass of the solid mixture?
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consider two 5 l chambers. in one, there are 5.00 g o, and in the other there are 5.00 g he. which has the higher pressure at room temperature?
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Why is air resistance important?
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How many moles of chlorine are present in 3 moles of MgCl2
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How can we increase a pulley's output force?
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what atomic or hybrid orbitals make up the sigma bond between and in acetic acid, ? ( is the second carbon in the structure as written. is the first oxygen in the structure as written.) orbital on orbital on what is the approximate bond angle? angle
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an atom with an imbalance of electrons to protons is a. a hadron. b. a baryon. c. an ion. d. an isotope. e. none of these
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if atoms were smaller, planck's constant would be group of answer choices larger. smaller. no different in physical size.
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select true or false: the radii of ions are always smaller than the radii of the corresponding atoms of the same element.
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the element hafnium (hf) has five stable isotopes. the correct number of nuclear particles in an atom of hafnium-178 is:
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ella is interested in combining substances to form a new material. what does she need to know before she combines the substances to create a specific material? a. whether the substances are synthetic or from natural resources b. that all materials react to combine and form new products accidentally c. the physical and chemical properties of the material that will be formed d. the physical and chemical properties of the substances and how they react chemically
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consider a 1.50-g mixture of magnesium nitrate and magnesium chloride. after dissolving this mixture in water, 0.500 m silver nitrate is added dropwise until precipitate formation is complete. this mass of the white precipitate formed is 0.641 g. a. calculate the mass percent of magnesium chloride in the mixture. b. determine the minimum volume of silver nitrate that must have been added to ensure complete formation of the precipitate
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question assume that 50.0ml of 1.0mnacl(aq) and 50.0ml of 1.0magno3(aq) were combined. according to the balanced equation, if 50.0ml of 2.0mnacl(aq) and 50.0ml of 1.0magno3(aq) were combined, the amount of precipitate formed wouldquestion assume that 50.0ml of 1.0mnacl(aq) and 50.0ml of 1.0magno3(aq) were combined. according to the balanced equation, if 50.0ml of 2.0mnacl(aq) and 50.0ml of 1.0magno3(aq) were combined, the amount of precipitate formed would
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a chemist adds of a silver(ii) oxide solution to a reaction flask. calculate the micromoles of silver(ii) oxide the chemist has added to the flask. round your answer to significant digits.
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Which of the following phase changes involves the transfer of heat from the surroundings to the system?ACH4(g)CH4(l)CH4(g)CH4(l), because CH4CH4 molecules in the gas phase must absorb energy in order to move closer together, thereby increasing the intermolecular attractions in the solid state.BCO2(g)CO2(s)CO2(g)CO2(s), because CO2CO2 molecules in the gas phase must absorb energy in order to move closer together, thereby increasing the intermolecular attractions in the liquid state.CH2O(l)H2O(s)H2O(l)H2O(s), because H2OH2O molecules in the liquid phase must absorb energy in order to create a crystalline structure with strong intermolecular attractions in the solid state.DNH3(l)NH3(g)NH3(l)NH3(g), because NH3NH3 molecules in the liquid phase must absorb energy in order to overcome their intermolecular attractions and become free gas molecules.
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convection occurs: group of answer choices in liquids only. in solids only. because hotter things are more dense and tend to sink. because hotter things are more dense and tend to rise. because hotter things are less dense and tend to rise.
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11 Which of the following forces are involved in maintaining the quaternary structure of a protein? a. hydrogen bonds b.ionic interactions c. hydrophobic interactions d. All of these
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Give the expected ground-state electron configurations for atoms with the following atomic numbers
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Suppose the galvanic cell sketched below is powered by the following reaction: Mg(s)+PdSO4(aq) MgSO4(aq)+Pd(s) e- E1 E2 s S2 Write a balanced equation for the half-reaction that happens at the cathode of this cell. Write a balanced equation for the half-reaction that happens at the anode of this cell. Of what substance is El made?
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What type of spectrum is produced when electromagnetic radiation is emitted or absorbed as electrons change energy levels in atom? (Please list one word only and lower case)
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