* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Activity 17 Follow-up
Stoichiometry wikipedia , lookup
Nuclear transmutation wikipedia , lookup
Metastable inner-shell molecular state wikipedia , lookup
Electrochemistry wikipedia , lookup
Nuclear chemistry wikipedia , lookup
Rutherford backscattering spectrometry wikipedia , lookup
Molecular orbital wikipedia , lookup
X-ray fluorescence wikipedia , lookup
Bent's rule wikipedia , lookup
Biochemistry wikipedia , lookup
Abundance of the chemical elements wikipedia , lookup
Periodic table wikipedia , lookup
Bond valence method wikipedia , lookup
Resonance (chemistry) wikipedia , lookup
Atomic orbital wikipedia , lookup
Artificial photosynthesis wikipedia , lookup
Isotopic labeling wikipedia , lookup
Electronegativity wikipedia , lookup
Chemical element wikipedia , lookup
Metalloprotein wikipedia , lookup
Molecular orbital diagram wikipedia , lookup
History of chemistry wikipedia , lookup
Atomic nucleus wikipedia , lookup
Hypervalent molecule wikipedia , lookup
Electrolysis of water wikipedia , lookup
Molecular dynamics wikipedia , lookup
Hydrogen-bond catalysis wikipedia , lookup
Chemical bond wikipedia , lookup
Water splitting wikipedia , lookup
Electron configuration wikipedia , lookup
Chemistry: A Volatile History wikipedia , lookup
Hydrogen bond wikipedia , lookup
History of molecular theory wikipedia , lookup
Hydrogen atom wikipedia , lookup
IUPAC nomenclature of inorganic chemistry 2005 wikipedia , lookup
Major Concepts Isotope Activity •An element can have a different number of neutrons, but always has the same number of protons •The atomic weight is the average weight of all the known isotopes of the element •The element which appears on the periodic table is the isotope which is most abundant Major Concepts cont. Atomic Symbol mass number 23 atomic number 11 Na sodium-23 • Elements of the same atom have the same atomic number, but different mass numbers Activity 17 Analysis 3. Was it possible for an atom to make more than one bond? Explain, and give an example. • • All atoms except hydrogen can make more than one bond For example……. 4. How many bonds could each of the following make with hydrogen? a. b. c. d. Si (Atomic # 14) S (Atomic # 34) I (Atomic # 53) As (Atomic # 33) 4 2 1 3 5. If you had two oxygen atoms and one hydrogen atom, could you form a molecule? Explain. • • • • No With 2 oxygens bonded together, you could bond 1 hydrogen. One of the oxygen atoms would have an unbonded site. It is not possible to put them together with all sites bonded H Unbonded site O O 6. Make a drawing of the models to show the difference between an atom and a molecule. H H Atom O Molecule • • • a molecule is made of more than one atom. it can be the same atom or it can be composed of more than one kind of atom. example of each……. Name _______________ Period ____ Date _______ Activity 17, Analysis # 6 & Activity 16, Analysis #4 Demo: Sodium in Water Chemical Formula 2Na(s) + 2H2O(l) ------ 2NaOH(aq) + H2(g) Sodium and hydrogen are both in group 1 and are very reactive. When the sodium reacts with the water it takes the place of one of the hydrogen atoms. This happens because sodium is more reactive than the hydrogen it is replacing. Reactivity is largely due to the atomic radius of an element and the valence. Larger metals lose their outer electrons more easily. If the sodium was less reactive than the hydrogen then there probably would be no chemical reaction in this case.