Chemistry

5. Use the formula that states the mass-to-volume ratio of a substance to solve the following:(a) what is the density of a substance that has a mass of 7.9 g and a volume of 4.3 cm?(b) what is the mass of a substance that has a density of 8.9 g/cm and a volume of 5 cm?(c) what is the volume of a substance that has a density of 1.25 g/mL and a mass of 150 g?
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Which one of the following compounds is not a product of reaction between 1,3-butadiene and HBr? Select one a. (S)-3-bromo-1-butene b. (R)-3-bromo-1-butene c. (E)-1-bromo-2-butene d. (Z)-1-bromo-2-butene e. (Z)-2-bromo-2-butene
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which is true about the rate-limiting step in a reaction? select all that apply: it is the slowest step. it limits (or determines) the rate of the reaction. it does not influence the rate law. it is always the first step. g
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lithium reacts spontaneously with bromine to produce lithium bromine. write the balanced chemical equation for the reaction. if 25.0g of lithium and 25.0g of bromine are present at the beginning of the reaction determine the excess reactant and the mass of the excess.
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which was an assumption bohr made in his model? select the correct answer below: wavelengths have negative values. energy values were quantized. neutrons are negatively charged. electrons are found in the nucleus.
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How many grams of aluminum sulfate would be formed if 3.52 grams of aluminum completely reacted with H2SO4?2Al + 3H2SO4 ---------------------> Al2(SO4)3 + 3H2
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calculate the ka based on the following information for the following unknown acid, ha. the ph of a buffer system is 4.219. the buffer is composed of 2.43 moles of ha and 1.75 moles of naa dissolved into 1.92 l of solution.
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an unknown gas effuses at a rate 0.667 times the rate of no. what is the molar mass of the unknown gas?
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The girl was measuring the hallway the first part was 132 inches long the second part was 3 yards long how long is the Hallway in feet?? I don't know the answer it is on my homework and I have to finish it up so I won't fail please help
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boron is composed of two naturally occurring isotopes, 10b and 11b. which of these isopotes is the most abundant in nature?
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why is it important not to dilute the initial sample befoe it has been loaded onto the chromatography column
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in the experiment where o2 consumption is measured with a respirometer how is a constant volume achieved?
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the process of sequential migration of electrons from one atom to the next is called , while the migration of electrons across a pn semiconductor junction is called
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chemistry!!!!!!!!!!!!
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determine the volume of hexane that contains 5.33 x 10^22 molecules of hexane. the density of hexane is 0.6548 g/ml and its molar mass is 86.17 g/mol
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Give the empirical formula of a hydrocarbon that when 60.68 g is combusted in the presence of oxygen and produces 89.12 grams of CO2CO2 and 36.48 g of H2OH2O.Write the formula with the atoms in the order CxHyOz. You can ignore the charge and phase.
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the atomic electron configuration inflluences the resulting mechanical properties of the material true false
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Describe how finding the formula differs between Ionic and Covalent compounds.
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for each compound (all water soluble), would you expect the resulting aqueous solution to conduct electrical current? check all that apply.
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57.0 ml of 0.90 m solution of hcl was diluted by water. the ph of this diluted solution is 0.90. how much water was added to the original solution
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which of the following statements about the periodic trend of atomic radius is/are true? i. atomic radius decreases from left to right across a period because zeff increases. ii. atomic radius increases from left to right
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Consider the Baeyer permanganate test and chromic acid tests. These tests work by converting an aldehyde to what functional group? 1 KMnO4 and H2CrO4 act as what kind of reagent? (e.g. electrophile, nucleophile, oxidizing agent, reducing agent, acid catalyst, base catalyst, solvent etc.) 2. 3. Why does a ketone not react with these reagents?
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How many mmHg are in 75.7 kpa? Round to 1 decimal place and answer in numbers ONLY.
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why did pbcl2 dissolve upon addition of water. what did adding water do to the concentration of ions?
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