LAREDO COMMUNITY COLLEGE Science Department CHEM 1411-1412 Practice Test Ch. 7 Periodic Properties Newton Name Instructions: Circle the letter of the BEST answer(s). Some questions may have multiple answers; be sure to include all correct answers. Each correct question is worth two (2) points. 1) __________ is credited with developing the concept of atomic numbers. A) Lothar Meyer B) Ernest Rutherford C) Michael Faraday
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with chlorine gas? 2. Explain your answer. 3. Draw an enthalpy profile for this reaction But some reactions that happen spontaneously are endothermic Demonstration see powerpoint slides 1. ammonium chloride and barium hydroxide 2. citric acid and sodium hydrogencarbonate (Alka-Seltzer). So there must be something more going on to explain why endothermic reactions occur. Entropy Entropy (S) is a measure of the disorder (or chaos or randomness) of
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words kept getting stuck in my throat‚ struggling to escape like a frightened monkey in a cage. I attempted to swallow saliva stuck in my mouth and gulp down large amounts of air so I could shout out something‚ but my body couldn’t spare the breath. My mouth started to produce copious amounts of white‚ sticky saliva as the wind soared into my mouth‚ and I felt like I wasn’t able to swallow or talk properly. We swerved into a dark driveway and caught our breath. “Let’s stay off the road‚” I gasped
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of snakes called constrictors‚ constrictors are not venomous snakes. Although the snakes do have teeth‚ they are not used for killing prey‚ constrictors strangle their prey by wrapping their body around it and squeezing until it is dead‚ then they swallow it whole. You may be wondering how. An anacondas jaw bones are loosely connected to the skull‚ there for their jaws can unhinge‚ giving them a very large mouth. Although a female anaconda does not lay eggs‚ she produces them inside of her‚ waits 8-2
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Produktinformation Seite 1 von 1 -k is h. PVC Handbook co m Pars Ethylene Kish Co. et hy le ne Charles E. Wilkes‚ Charles A. Daniels‚ James W. Summers Leseprobe 2 ar as ISBN 3-446-22714-8 w w w .p Weitere Informationen oder Bestellungen unter http://www.hanser.de/3-446-22714-8 sowie im Buchhandel www.parsethylene-kish.com (+98 - 21) 88 20 20 60 http://www.hanser.de/deckblatt/deckblatt1.asp?isbn=3-446-22714-8&style=Vorwort 18.08.2005 Pars Ethylene Kish Co. Flexible PVC -k
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If your reactants are at a higher energy level than your products then the reaction is exothermic this means it has a ΔH° Standard Enthalpy ( ΔH°) The internal energy stored in the reactants. Only changes in enthalpy can be measured. 1. When some solid barium hydroxide and solid ammonium thiosulfate were reacted together‚ the temperature of the surroundings was observed to decrease from 15 ºC to – 4 ºC. What can be deduced from this observation? A. The reaction is exothermic and ∆H is negative
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Unit 3 Chemistry: VCAA Practice Exam Questions 1 Question 3 (2010) A sample of the insecticide dichlorodiphenyltrichloroethane (DDT)‚ C14H9Cl5‚ was found to contain 0.120 g of carbon. What mass of chlorine was present in the sample? A. 0.127 g B. 0.355 g C. 0.994 g D. 1.01 g Question 10 (2009) The level of carbon dioxide in the air in a spacecraft can be controlled by passing the air through canisters containing lithium hydroxide‚ LiOH. In a laboratory trial‚ the air in a 5.00 L container
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A metal is a solid material which is either an element‚ a compound or an alloy. Metals share some common properties like being typically hard and shiny‚ and that metals are good electrical and thermal conductors. They are generally malleable‚ fusible and ductile. In a periodic table of elements‚ there are six groups of metals and two of them are the most common. It is the Alkali Metals and the Alkaline Earth Metals. Alkali metals comprise the group 1 elements. They are similarly shiny‚ soft
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Oscar Wilde (1854-1900) was one of the most successful authors of the late Victorian Age. Wilde was involved in the aestheticism movement‚ which attempted to establish art as just pieces of beauty. Many people of the Victorian Era believed all works of art had a deeper meaning and purpose other than for pleasure‚ but Wilde worked to disprove this idea. He believed that art is self sufficient and it does not have to teach morals or to show political commitment to society‚ and that the artist is
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swallowing. One example would be when someone suffers a stroke. Swallowing involves organized interactions between several areas of the brain and the peripheral systems and when a stroke occurs many of these systems are disrupted and the ability to swallow is affected. This can occur in up to 65 percent of stroke patients and if not identified and managed correctly then it can lead to poor nutrition and increased disability and a compromised immune system. There is also a high risk of aspiration among
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