Chemistry - cloudfront.net
... Polar covalent bonds form when electrons are shared unequally. Atoms in this kind of bond have electronegativities that are different and an unequal distribution of the electrons results. The electrons forming the bond are closer to the atom with the greater electronegativity and produce a negative ...
... Polar covalent bonds form when electrons are shared unequally. Atoms in this kind of bond have electronegativities that are different and an unequal distribution of the electrons results. The electrons forming the bond are closer to the atom with the greater electronegativity and produce a negative ...
02_Lecture
... with the smallest doses of radiation in the shortest period of time. • Isotopes are used to provide images of specific body tissues. • Iodine, used only by the thyroid gland, can be used to obtain an image of the thyroid gland because radioactive iodine will accumulate in ...
... with the smallest doses of radiation in the shortest period of time. • Isotopes are used to provide images of specific body tissues. • Iodine, used only by the thyroid gland, can be used to obtain an image of the thyroid gland because radioactive iodine will accumulate in ...
UNIT I - apbiologypathways
... b. Water is Wet Water adheres to a surface due to two properties. 1) Adhesion: The attraction between water and other substances. 2) Cohesion: The attraction of water molecules to other water molecules. These two properties allow capillary action. Water is attracted to the polar substances (adhesion ...
... b. Water is Wet Water adheres to a surface due to two properties. 1) Adhesion: The attraction between water and other substances. 2) Cohesion: The attraction of water molecules to other water molecules. These two properties allow capillary action. Water is attracted to the polar substances (adhesion ...
types of reactions
... Most reactions fall into these five categories, and some may fall into more than one . ...
... Most reactions fall into these five categories, and some may fall into more than one . ...
Chapter 3
... Foundations of Atomic Theory, continued • Law of definite proportions: a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound • Law of multiple proportions: if two or more different compounds are composed ...
... Foundations of Atomic Theory, continued • Law of definite proportions: a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound • Law of multiple proportions: if two or more different compounds are composed ...
4 Radioactive Elements
... They decay randomly, one at a time. Although you can’t predict when any particular nucleus will decay, the time it takes for half the atoms to change can be measured. The half-life of an isotope is the length of time needed for half of the atoms of a sample to decay. The half-life is different for e ...
... They decay randomly, one at a time. Although you can’t predict when any particular nucleus will decay, the time it takes for half the atoms to change can be measured. The half-life of an isotope is the length of time needed for half of the atoms of a sample to decay. The half-life is different for e ...
Topic 1 Assignment File
... 14. Can the molecular formula of a compound ever be the same as the empirical formula? Explain your answer. 15. What is the empirical formula of a compound that has three times as many hydrogen atoms as carbon atoms, but only half as many oxygen atoms as carbon atoms? ...
... 14. Can the molecular formula of a compound ever be the same as the empirical formula? Explain your answer. 15. What is the empirical formula of a compound that has three times as many hydrogen atoms as carbon atoms, but only half as many oxygen atoms as carbon atoms? ...
atom
... Atoms have no overall charge so contain the same number of protons (+) as electrons (-). The number of protons in the nucleus of an atom is called the atomic number It is given the symbol Z. All atoms of a given type or element have the same atomic number (Z). The periodic table arranges atoms in or ...
... Atoms have no overall charge so contain the same number of protons (+) as electrons (-). The number of protons in the nucleus of an atom is called the atomic number It is given the symbol Z. All atoms of a given type or element have the same atomic number (Z). The periodic table arranges atoms in or ...
+1/2
... INTEGRATION OF A PEAK Not only does each different type of hydrogen give a distinct peak in the NMR spectrum, but we can also tell the relative numbers of each type of hydrogen by a process called integration. ...
... INTEGRATION OF A PEAK Not only does each different type of hydrogen give a distinct peak in the NMR spectrum, but we can also tell the relative numbers of each type of hydrogen by a process called integration. ...
Nuclear Physics - Assam Valley School
... 19. Compare the : (a) ionising power, (b) penetration power of α, β and γ-particles. Ans. (a) Ionising power : If one unit is ionising power of γ-radiations, then 100 units is ionising power of β-particles and 10000 units is the ionising power of α-particles. (b)Penetration power : γ-radiations can ...
... 19. Compare the : (a) ionising power, (b) penetration power of α, β and γ-particles. Ans. (a) Ionising power : If one unit is ionising power of γ-radiations, then 100 units is ionising power of β-particles and 10000 units is the ionising power of α-particles. (b)Penetration power : γ-radiations can ...
Chapter 9 - Preparatory Chemistry
... objects in terms of a collective unit such as a dozen, a gross, or a ream, and use this and the weighted average to create a conversion factor to make conversions between mass and number of objects. ...
... objects in terms of a collective unit such as a dozen, a gross, or a ream, and use this and the weighted average to create a conversion factor to make conversions between mass and number of objects. ...
Radioisotopes: An overview - International Journal of Case Reports
... isotopes which have same atomic number but differ in their atomic mass. These unstable element decay by emission of energy such isotopes, which emit radiation, are called radioisotopes. Using of these isotopes in various sectors like industries, agriculture, healthcare and research centres has got a ...
... isotopes which have same atomic number but differ in their atomic mass. These unstable element decay by emission of energy such isotopes, which emit radiation, are called radioisotopes. Using of these isotopes in various sectors like industries, agriculture, healthcare and research centres has got a ...
practice final examination
... 10. Answer true or false for each of the following questions below (circle your choice): a) ...
... 10. Answer true or false for each of the following questions below (circle your choice): a) ...
Importance of supersaturated carbon concentrations in catalytic
... carbon concentration decreases, i.e., between 1.8 and 3.5 ns. The number of dissolved carbon atoms remains constant (at a supersaturated level) once the cap is formed. The maximum in the dissolved carbon concentration (between 0.7 and 3.5 ns in Fig. 3) shows that a highly supersaturated carbon conce ...
... carbon concentration decreases, i.e., between 1.8 and 3.5 ns. The number of dissolved carbon atoms remains constant (at a supersaturated level) once the cap is formed. The maximum in the dissolved carbon concentration (between 0.7 and 3.5 ns in Fig. 3) shows that a highly supersaturated carbon conce ...
13.437. preparative chemistry: spectroscopic and structural
... an in depth treatment of any of the techniques, since each one could easily be the subject of a ten lecture course (or more!). Some background theory will be covered in each case to give an overview of how the technique works and what information it can give, followed by some examples from the liter ...
... an in depth treatment of any of the techniques, since each one could easily be the subject of a ten lecture course (or more!). Some background theory will be covered in each case to give an overview of how the technique works and what information it can give, followed by some examples from the liter ...
... Leu by the properties of their sidechains is shown on the right. Charged Lys Non-polar Asp Glycine is omitted since its sidechain is just a hydrogen atom. Arg Met Val Glu As the diagram suggests, a sidechain can be non-polar, charged Cys Ala Ile Asn (pH between 0 and 10), or polar. Some amino acids ...
NMR Spectroscopy
... •Electronegative groups are "deshielding" and tend to move NMR signals from attached carbons further "downfield" (to higher ppm values). •The -system of alkenes, aromatic compounds and carbonyls strongly deshield C nuclei and move them "downfield" to higher ppm values. •Carbonyl carbons are strongl ...
... •Electronegative groups are "deshielding" and tend to move NMR signals from attached carbons further "downfield" (to higher ppm values). •The -system of alkenes, aromatic compounds and carbonyls strongly deshield C nuclei and move them "downfield" to higher ppm values. •Carbonyl carbons are strongl ...
Identify the following properties as either - Teach-n-Learn-Chem
... 25. Justify why or why not we should pursue an energy program of nuclear fusion in the United States. You need to explain the differences in fission and fusion, site advantages and disadvantages of each. Fossil fuels pollute and generate CO2 (responsible for global warming) and are diminishing in a ...
... 25. Justify why or why not we should pursue an energy program of nuclear fusion in the United States. You need to explain the differences in fission and fusion, site advantages and disadvantages of each. Fossil fuels pollute and generate CO2 (responsible for global warming) and are diminishing in a ...
Preview Sample 1
... energy that radioactive emissions impart to surrounding atoms. This transfer of energy can change the structure of water and important biochemical substances such as proteins, DNA, lipids, and others foun ...
... energy that radioactive emissions impart to surrounding atoms. This transfer of energy can change the structure of water and important biochemical substances such as proteins, DNA, lipids, and others foun ...
Full Review
... Balancing equation- write the coefficients? Chapter 8,9 –(15%)- 6 questions! How many moles, number of atoms/molecules ? Empirical formula- easy one Molecular formulas- Ratio Calculations in chemical reaction how much reactant will produce how much product, moles to moles, grams to grams etc (3 ques ...
... Balancing equation- write the coefficients? Chapter 8,9 –(15%)- 6 questions! How many moles, number of atoms/molecules ? Empirical formula- easy one Molecular formulas- Ratio Calculations in chemical reaction how much reactant will produce how much product, moles to moles, grams to grams etc (3 ques ...
AP Chemistry Summer Assignment 2016 revised
... Use print and Internet Resources to complete the following problems. The URLs below represent a fraction of the available chemistry addresses available. Please feel free to expand the list and find other web sites that help prepare you for the coming year. We recommend that you complete as many onl ...
... Use print and Internet Resources to complete the following problems. The URLs below represent a fraction of the available chemistry addresses available. Please feel free to expand the list and find other web sites that help prepare you for the coming year. We recommend that you complete as many onl ...
Chemical Reactions
... 2. Predict the product(s) using the type of reaction as a model 3. Balance it Don’t forget about the diatomic elements! (BrINClHOF) For example, Oxygen is O2 as an element. In a compound, it can’t be a diatomic element because it’s not an element anymore, it’s a compound! ...
... 2. Predict the product(s) using the type of reaction as a model 3. Balance it Don’t forget about the diatomic elements! (BrINClHOF) For example, Oxygen is O2 as an element. In a compound, it can’t be a diatomic element because it’s not an element anymore, it’s a compound! ...
hc1(8)notes
... • Use an activity series to predict whether a given reaction will occur and what the products will be. ...
... • Use an activity series to predict whether a given reaction will occur and what the products will be. ...
Isotopic labeling
Isotopic labeling (or isotopic labelling) is a technique used to track the passage of an isotope, or an atom with a variation, through a reaction, metabolic pathway, or cell. The reactant is 'labeled' by replacing specific atoms by their isotope. The reactant is then allowed to undergo the reaction. The position of the isotopes in the products is measured to determine the sequence the isotopic atom followed in the reaction or the cell's metabolic pathway. The nuclides used in isotopic labeling may be stable nuclides or radionuclides. In the latter case, the labeling is called radiolabeling.In isotopic labeling, there are multiple ways to detect the presence of labeling isotopes; through their mass, vibrational mode, or radioactive decay. Mass spectrometry detects the difference in an isotope's mass, while infrared spectroscopy detects the difference in the isotope's vibrational modes. Nuclear magnetic resonance detects atoms with different gyromagnetic ratios. The radioactive decay can be detected through an ionization chamber or autoradiographs of gels.An example of the use of isotopic labeling is the study of phenol (C6H5OH) in water by replacing common hydrogen (protium) with deuterium (deuterium labeling). Upon adding phenol to deuterated water (water containing D2O in addition to the usual H2O), the substitution of deuterium for the hydrogen is observed in phenol's hydroxyl group (resulting in C6H5OD), indicating that phenol readily undergoes hydrogen-exchange reactions with water. Only the hydroxyl group was affected, indicating that the other 5 hydrogen atoms did not participate in these exchange reactions.