Assessment 1) Describe the difference between ionic and covalent bond. Ionic bonds have electrostatic forces that hold cations and anions together‚ and are electronic neutral. Covalent bonds are bonds that don’t give or take any electrons. In stead they share the elctrons 50) Which of these compounds contain elements that do not follow the octet rule? Explain. a) NF3: 5 + (7*3) = 26 b) PCl2F3: 5 + (7*2) + (7*3) = 40 c) SF4: 6 + (7 *4) = 24 d) SCl2: 6 + (7*2) = 20 The answer is “d”
Premium Covalent bond Chemical bond Atom
Yafaa Chaudhary PHYSICS 5 NOTES Physics 5 3.5.1 Radioactivity Evidence for the nucleus Qualitative study for the Rutherford scattering. Rutherford directed a narrow beam of α-particles‚ all of the same kinetic energy‚ in an evacuated container at a thin gold film‚ in order to identify the structure of an atom: The α-particles need to be of the same kinetic energy otherwise slow α-particles would be deflected more than faster α-particles on the same initial path. The container needs to be evacuated
Premium Neutron Nuclear fission Atom
Ketterings The cation exchange capacity (CEC) of a soil is a measure of the quantity of negatively charged sites on soil surfaces that can retain positively charged ions (cations) such as calcium (Ca2+)‚ magnesium (Mg2+)‚ and potassium (K+)‚ by electrostatic forces. Cations retained electrostatically are easily exchangeable with cations in the soil solution so a soil with a higher CEC has a greater capacity to maintain adequate quantities of Ca2+‚ Mg2+ and K+ than a soil with a low CEC. A soil with
Premium Soil Humus Ion
as a building. The question is though‚ how is it even possible for anything to climb up and down walls? Scientist has wondered for many years what keeps gravity from forcing these creatures down to the ground. Hypotheses as bizarre as friction‚ electrostatic attraction‚ suction‚ and even glue have all been considered for possible features of the gecko’s feet. After many different tests‚ Kellar Autumn of Lewis and Clark College of Portland‚ Oregon and Robert Full of the University of California‚ Berkley
Premium Question
familiarization of electrical apparatus. Name Image Symbol Uses of functions Galvanometer A galvanometer is a very sensitive meter which is used to measure tiny currents‚ usually 1mA or less. Ammeter An ammeter is used to measure current. Voltmeter A voltmeter is used to measure voltage. Resistor (Fixed and Variable) Fixed Variable A resistor restricts the flow of current‚ for example to limit the current passing through an LED. A resistor is used with a capacitor in
Premium Electricity Electric current Alternating current
A bumblebee is any member of the bee genus Bombus‚ in the family Apidae. There are over 250 known species‚[1] existing primarily in the Northern Hemisphere although they also occur in South America. They have been introduced to New Zealand and the Australian state of Tasmania. Bumblebees are social insects that are characterised by black and yellow body hairs‚ often in bands. However‚ some species have orange or red on their bodies‚ or may be entirely black.[2] Another obvious (but not unique) characteristic
Premium Bumblebee Honey bee Bee
Enzymes Lecture outlines •Catalysis profile •Activation energy & its •Enzyme & substrate substrates •How enzymes bind to •Lock & Key model •Induced-fit model •Enzyme assay Lecture outcomes • At the end of this lecture‚ students are able to: • Define the catalyst • Understand how enzymes work as catalysts‚ the concept of activation energy and enzymes-substrate binding • Explain different theories of the relation between enzymes and substrates Catalysis • It is probably
Premium Enzyme Catalysis Metabolism
Hazards of Static Electricity; Lightning Lightning is a massive electrostatic discharge between the electrically charged regions within clouds or between a cloud and the surface of a planet. It is the sudden high-current discharge caused by the atmosphere’s electrical breakdown. Lightning is also one of the most deadly natural phenomena known to man. Lightning is an electric current; thus within a thundercloud up in the sky‚ many small bits of ice (frozen raindrops) collide into each other as
Premium Electric charge Electricity Electron
www.respironics.com CPAP System User Manual 1023238 JW 07/06/05 Table of Contents Symbol Key ................................................................................... 2 Intended Use & Contraindications ............................................. 3 Specifications ............................................................................... 4 Warnings & Cautions ................................................................... 5 System Features .......................
Premium Sleep apnea
Many of the metal and plastic products we use are colored. We know that metal doesn’t have vibrant hues and is typically silvery‚ grey or a deep red. To get it to achieve something along the lines of yellow or blue‚ a process called powder coating is applied. Liquid paint is another way to get metal to look colorful. And while it is effective to a degree and depending on what the parts are to be used for‚ its industrial advantages are just no match against powder coating. In the manufacturing sector
Premium Marketing Costs Economics