What is the difference between a molecule and a compound?How are they alike?
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A compound contains more than one element (H2O).  A molecule may contain atoms of one element only (O2).
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Chemistry is Chemistry (derived from alchemy) is the science of matter and study of inner molecules and atoms. You study metal properties, its characteristics and behaviour. You study about Organic and InOrganic Materials. You will also learn about mixing chemicals - Reactants and Products. Don't worry now, it will soon become interesting.\n\nThe atomic mass of a chemical element is the mass of an atom at rest and Atomic number (Z) is the number of protons found in the nucleus of an atom.
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First of all, do you know what a molecule is?\n\nA molecule is the smallest particle of a substance (that still has the same chemical and physical properties of the substance) that is composed of 2 or more atoms.  Atoms are held together by a number of chemical forces, including a wide variety of bonds.\n\nAn inorganic molecule is a molecule from a substance that is non-living.  It is not composed of organic (living) matter, and often times that means it will not contain carbon, as carbon (C) is the main element of organic molecules.
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There is confusion here between references to a chemical compound and a physical state. The chemical name given to the combination H2O is water. This is completely separate from the physical states it can take of solid, liquid or gas. Even when solid, the chemical compound is still water. In our lives water is vital and we interact with it in all of its physical forms. It is only sensible that our language would have different names for this important material as a solid (ice), a liquid (water) and a gas (steam/water vapor). I am sure these distinctions already existed before humans really understood that all three were the same material. So in everyday language we call solid water ice. To a scientist it is the chemical water in a solid form. Scientist might refer to other materials that are not usually in the solid state as ices so it might be necessary to clarify that it is water ice and not, for instance, nitrogen ice.
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by molecular bonds.  covalent and ionic.
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a two attom molecule. molecule=more than one attom
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The molecular mass of a substance (less accurately called molecular weight and abbreviated as MW) is the mass of one molecule of that substance, relative to the unified atomic mass unit u (equal to 1/12 the mass of one atom of carbon-12).\n\nThe molecular mass can be calculated as the sum of the atomic masses of all the atoms of any one molecule. The molecular mass can also be measured directly using mass spectrometry. In mass spectrometry, the molecular mass of a small molecule (< ~200 atoms of a given element) is exact, that is, the sum of the most common isotopes of each element. Of larger molecules, it is average, or calculated using the elemental mass number or the periodic table, since there is likely to be a statistical distribution of atoms representing the isotopes throughout the molecule.
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The word molecule tells you that it is a covalent compound (if it were ionic, it would be called a unit cell). Covalent compounds are USUALLY between nonmetals but in some cases can be between a metal and a non-metal. It all boils down to electronegativity difference (how much harder one atom is pulling on the electrons in question than the other atom). I hope this helps!
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The molecules in blood are mostly water - they're certainly the same size no matter where they're found, since a molecule is just a collection of atoms, and atoms of the same element are identical. (Strictly speaking, sometimes atoms are slightly different, but that's beyond the scope of your question.)
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d)  both a and c\n\nbecasue in a chemical reaction   everythin on the product and teh reactant must be the same\n\nthe mass and atoms must be same
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an atom----- the smallest unit of a chemical element that can display the properties of that element, and which is capable of combining with other atoms to form molecules.
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Element:\n\nA substance composed of atoms having an identical number of protons in each nucleus. Elements cannot be reduced to simpler substances by normal chemical means.
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Organic compounds are ones containing carbon.  Methane is nothing more than a single carbon atom surrounded by four hydrogen atoms, making the molecule very much reduced.  The methane there can be used to react with other reagents to build larger organic molecules with methane as a building block.
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Yes, compound must contain two or more elements.  By definition, a chemical compound is a chemical substance consisting of chemically bonded chemical elements, with a fixed ratio determining the composition. For example, water (H2O) is a compound consisting of two hydrogen atoms bonded to every oxygen atom.  There is no limit as to the maximum number of elements a compound can consist.  Some example of compound are ammonia (NH3), methane (CH4), sodium chloride (NaCl), sulfuric acid (H2SO4), etc.
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A chemical formula states the ratios of elements within a compound. Molar Mass is simply the mass of a single molecule or formula unit of that compound, and an empirical formula states the smallest, simplified ratio in a compound. Think of it as a chemical formula reduced by a common factor.
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Similarities: All S-orbitals are spherical.  Any given molecule has only a single 1s orbital, and a single 2s orbital.\n\nDifferences: S-orbitals grow more complex as you go up to higher levels.  The 1s orbital has no spherical node, while the 2s orbital has 1 spherical node.
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um...  subtract???  hahaha\n\nThe higher the differences in electronegativity, the more ionic the compound.  The higher electronegative atom/ion will want to "hog" all the electrons.  They are greedy like that.  They don't want to share (which would be a covalent bond).