Giddy Up!
Get students moving with his video for students for kindergarten through third grade. The exercises do not take up too much floor space and students can do the exercises at their desks. The music featured is fast-paced country music. (04:53)
Hey, Sleepyhead!
Get students moving with his video for students for kindergarten through third grade. The exercises do not take up too much floor space and students can do the exercises at their desks. The video shows that students with limited movement can do the movements, as well. The music featured is fast-paced 'pop' music. (05:01)
Trading at Noon: Auto sales get a jump start
Dec 3 - Sandy brings a surge of car sales & we look at trends in dealmaking.
U.S. Day Ahead: Obama meets with state leaders on "cliff"
In round #2 of this week's "fiscal cliff" talks, President Obama meets at the White House with a bipartisan group of governors, including Delaware's Jack Markell and Wisconsin's Scott Walker.
The Paganini Project with Peter Sheppard Skærved
Polymathic and ever-curious British violinist Peter Sheppard Skærved delves into the Library's fascinating Niccolò Paganini collection. Examining posters, playbills, letters, manuscripts and memorabilia collected by Paganini himself, he reveals how the virtuoso created his own mystique as a violinist and musical innovator. From his "Secret Red Book" containing recipes, prescriptions, tour dates, a laundry list and financial notes, to clues about the virtuoso's alleged use of a steel bow, our P
Climate Change and Food Security: Challenges, Success and Opportunities in Bangladesh
By: UP Los Baños Presentation by Mr. Mohammad Alamgir, Senior Scientific Officer (Forestry), Ministry of Water Resources, Bangladesh. Delivered during the International Conference on Climate Change Impacts and Adaptation for Food and Environmental Security, November 21-22, 2012 at SEARCA, UPLB, College, Laguna, Philippines.
Groter en kleiner dan Leerlingen vergelijken twee getallen en plaatsen er het juiste teken (>, < of =) tussen. Er wordt gewerkt met getallen tot en met vijf.
Mijn Tuin.org : Meer tuin, minder moeite Deze website bundelt informatie over tuinen en planten. Je vindt er onder andere:
2.7 Inferring relationships of common ancestry This clip addresses the question of how one might go about building a tree, or inferring relationships of common ancestry, by recognising evolutionary novelties, or share 3.2 Natural dives The physiology of the diving response can be studied in the laboratory, but investigating the behaviour of a diving mammal in its natural environment can be more of a problem. However, modern physiological techniques have made it possible to record continuously physiological variables (such as heart rate) and information on depth and position during the spontaneous dives in the wild that are part of the animal's normal behaviour. Most such findings show that the majority of an animal's dives 4.5 More about covalent bonding So far, the valencies in Table 1 have just been numbers that we use to predict the formulae of compounds. But in the case of covalent substances they can tell us more. In particular, they can tell us how the atoms are linked together in the molecule. This information is obtained from a two-dimensional drawing of the structural form 4.3 Metallic bonding Two familiar properties of metals point to a simple model of metallic bonding. Firstly, metals have a strong tendency to form positive ions. Thus, when sodium reacts with water, and when magnesium and aluminium react with acids, hydrogen gas is evolved and the ions Na+(aq), Mg2+(aq) and Al3+(aq), respectively, are formed. Secondly, metals are good conductors of electricity: when a voltage difference is applied 3.5 Electron states and box diagrams So far, we have represented the electronic state of an atom as a collection of sub-shells. Now we turn to the states of the electrons within those sub-shells. Just as shells can be broken down into sub-shells, so sub-shells can be broken down into atomic orbitals. Each atomic orbital describes an allowed spatial distribution about the nucleus for an electron in the sub-shell. Here we shall only be concerned with their number. Consider the formula for the sub-shell electron capaci 1.2 Chemical elements Atoms of the same atomic number behave virtually identically in chemical reactions. They are therefore given the same chemical name and chemical symbol. For example, the atom of atomic number 6, which is shown in Figure 1, is a carbon atom, whose symbol is C. All materials are made of atoms, but there is a special class of substan 1.1 Introduction The idea that everything that we can see is an assembly of tiny particles called atoms is chemistry's greatest contribution to science. There are about 120 known kinds of atom, and each one is distinguished by a name, by a chemical symbol, and by a number called the atomic number. The meaning of atomic number is best understood from the Rutherford model of the atom (Author(s): Learning outcomes After studying this unit you should be able to: explain what is meant by isotopes, atomic numbers and mass numbers of the atoms of chemical elements by referring to the Rutherford model of the atom; give an example of how differences in the molecular structures of chemical compounds give rise to differences in macroscopic properties; given a Periodic Table, point to some sets of elements with similar chemistry and to others in which there are progre Introduction This unit is an adapted extract from the course The molecular world
(S205) This unit will provide you with a detailed understanding of some of the important problems and topics that are being studied by the chemists of today, and of the ways in which associated problems might be solved by chemical methods. But to acquire this understanding you must have a good grasp of fundamental chemic Acknowledgements The material acknowledged below is Proprietary (see terms and conditions) and used under licence (not subject to Creative Commons licence). The content is from SM358_1 Book 1 Wave Mechanics – Chapter 7 Scattering and Tunnelling, pages 178–209. Grateful acknowledgement is made to the following sources 6 Summary Scattering is a process in which incident particles interact with a target and are changed in nature, number, speed or direction of motion as a result. Tunnelling is a quantum phenomenon in which particles that are incident on a classically impenetrable barrier are able to pass through the barrier and e 5.4 The scanning tunnelling microscope The scanning tunnelling microscope (STM) is a device of such extraordinary sensitivity that it can reveal the distribution of individual atoms on the surface of a sample. It can also be used to manipulate atoms and even to promote chemical reactions between specific atoms. The first STM was developed in 1981 at the IBM Laboratories in Zurich by Gerd Binnig and Heinrich Rohrer. Their achievement was recognised by the award of the 1986 Nobel prize for physics. In an STM the sample
Activity 6
