Chemistry

Which of the following is already in its empirical formula?-C22H34O10-C6H6-C6H1203-C5H1202-none of these
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a sample is sent to the laboratory for an anti-xa assay. the result of the ptt is 65.7 seconds. the result of the anti-xa assay is 0.9 u/ml of heparin. the patient is on lovenox. their anti-xa level is:
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what does the retention factor mean in terms of solubility of the pigments in the mobile phase and their interactions with the stationary phase
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explain why oxygen forms 2 bonds to hydrogen to make a water molecule, while nitrogen forms 3 bonds to make a molecule of ammonia
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palladium crystallizes in a face-centered cubic unit cell. its density is 12.0 g / cm3 at 27oc. calculate the atomic radius of pd.
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I dont get this at allll
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Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n = 3 to n = 1.
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1. What is the use of the following reagents in the various organic reactions? a. Carbon tetra chloride in the preparation of alkynes (
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consider the multistep reaction below. what is the balanced chemical equation of the overall reaction?
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100cm3 of a gas at 27degree Celsius exert a pressure of its volume is increased to 200cm3 at 127 degrees Celsius
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Calculate the molarity of 36.5 g of NaOH in 360 mL of an NaOH solution
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acetic acid has a ka of 1.80x10-5. what is the ph of a buffer solution made from 0.150 m hc2h3o2 and 0.530 m c2h3o2 -?
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oxygen gas is collected over water. the total pressure (the o2 pressure the water vapor pressure) is 748 torr. the temperature of the water is such that the water vapor pressure is 23 torr. what is the partial pressure of the oxygen gas in torr? answer:
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Given that the partial charges on C and O in carbon monoxide are 0.020 and 0.020, respectively, calculate the dipole moment of CO. (The distance between the partial charges, r, is 113 pm.)
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how could you perform an experiment by adjusting the ionic concentrations to determine the cause of the resting potential?
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a polar covalent bond is associated with which of the following? group of answer choices interactions between nuclei unequal sharing of electrons equal sharing of electrons the transfer of electrons
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Answer with the Matching-match the letter with the correct item
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specifically, what should you look at in the infrared spectrum of the ester you synthesized that will show the absence of the reactants?
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how much energy can metals hold?do different types of metals hold different types of energy?how to you measure how much energy something has?
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a scientist conducts an experiment to determine the rate of the following reaction: if the initial concentration of n2 was 0.400 m and the concentration of n2 was 0.350 m after 0.100 s, what is the average rate of reaction over the first 100 milliseconds?
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Which orbital diagram represents helium (atomic number = 2)?
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quartz is a solid in which atoms are not arranged in an orderly pattern. group of answer choices true false
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how much oxygen is needed to completely oxidize 1.67*10-3 m glucose solution (c6h12o6) completely to co2 and h2o?
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what is the [hcoo-]/[hcooh] ratio in an acetate buffer at ph 4.50? (the pka for formic acid is 3.80.) [hcoo-]/[hcooh]
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