How to Do the Barking Dog Chemistry Demonstration

How to Do the Barking Dog Chemistry Demonstration The Barking Dog chemistry demonstration is based on an exothermic reaction between nitrous oxide or nitrogen monoxide and carbon disulfide. Ignition of the mixture in a long tube results in a bright blue chemiluminescent flash, accompanied by a characteristic barking or woofing sound. Materials for the Barking Dog Demonstration Stoppered glass tube containing N2O (nitrous oxide) or NO (nitrogen monoxide or nitric oxide). You can prepare and collect nitrous oxide or nitrogen monoxide yourself.CS2, carbon disulfideLighter or match How to Perform the Barking Dog Demonstration Unstopper the tube of nitrous oxide or nitrogen monoxide to add a few drops of carbon disulfide.Immediately re-stopper the container.Swirl the contents around to mix the nitrogen compound and carbon disulfide.Light a match or lighter. Unstopper the tube and ignite the mixture. You can throw a lit match into the tube or use a long-handled lighter.The flame front will move rapidly, creating a bright blue chemiluminescent flash and a barking or woofing sound. You can re-light the mixture a few times. After the demonstration is performed, you can see sulfur coating the inside of the glass tube. Safety Information This demonstration should be prepared and performed inside a fume hood by a person wearing safety goggles. Carbon disulfide is toxic and has a low flash point. What Is Happening in the Barking Dog Demonstration? When the nitrogen monoxide or nitrous oxide is mixed with carbon disulfide and ignited, a combustion wave travels down the tube. If the tube is long enough you can follow the progression of the wave. The gas ahead of the wavefront is compressed and explodes at a distance determined by the length of the tube (which is why when you re-ignite the mixture, the barking sounds in harmonics). The bright blue light that accompanies the reaction is one of the few examples of a chemiluminescent reaction that occurs in the gas phase. The exothermic decomposition reaction between nitrogen monoxide (oxidizer) and carbon disulfide (fuel) forms nitrogen, carbon monoxide, carbon dioxide, sulfur dioxide and elemental sulfur. 3 NO CS2 → 3/2 N2 CO SO2 1/8 S8 4 NO CS2 → 2 N2 CO2 SO2 1/8 S8 Notes about the Barking Dog Reaction This reaction was performed by Justus von Liebig in 1853 using nitrogen monoxide and carbon disulfide. The demonstration was so well-received that Liebig performed it a second time, although this time there was an explosion (Queen Therese of Bavaria received a minor wound on the cheek). Its possible the nitrogen monoxide in the second demonstration was contaminated with oxygen, to form nitrogen dioxide. There is also a safer alternative to this project that you can do with or without a lab.

Portfoilio week 8 6310 Essay Example | Topics and Well Written Essays - 500 words

Portfoilio week 8 6310 - Essay Example The demonstrations will be on the oral methods of drug administration to different types of patients depending on their ages, conditions and instructions from the doctor. In line with this, i will divide the class into several teams of two people each and then using the simulation dummies (where I will have attached notes on each â€Å"patient† to be administered drug to), I will monitor and evaluate on how each team performs its instructions (based on what I have taught in class) and then grade them (Billings and Halstead, 2012). According to Svinicki and McKeachie, (2011), demonstration is an effective and useful method to evaluate the learning of students where the main aim of the lesson is practicality. The objectives of this lesson are: Students will identify different methods of imparting positive attitude to the patients during the drug administration. This first objective on a higher level taxonomy yields two objectives which are: students will select the best method to use to impart positive attitude to the patients during drug administration. The second one is: students will apply this selected method when administering drugs to the patients. How are the learners able to identify the different ways of imparting positive attitude during drug administration? How are they able to select the best of these methods and applying them? The other objective is: the students to list the different ways of administering oral medication according to the patient’s condition, age and doctors’ instructions. On a higher level taxonomy (http://www.nwlink.com/~donclark/hrd/bloom.html), this objective has two other objectives which are: the students to select the most effective ways to administer drugs according to the patient’s condition and doctor’s instructions and the other is for the students to be able to apply the most effective ways of administering oral medication according to the patient’s condition,

Allocation Problem Research Paper Example | Topics and Well Written Essays - 500 words

Allocation Problem - Research Paper Example I would, therefore, create a report on cost allocation based on certain estimations after analyzing Dell’s gross margin from income statements (Dell Financials, 2010). In Desktop PCs category, the main inputs include motherboard, processor, peripheral devices (keyboard and mouse), monitor, hard disks, DVD ROM, RAM, power supply, power buttons, speakers, outer casing, internal and external wire connectors, modem, LAN and 3D-graphics cards etc. The Desktop PCs category could be divided into departments such as purchases, component production, fitting and hardware installation, software installation, administration, inventory maintenance, after sales services (warranty expenses), wastage, breakage, pilferage etc. The costs will be allocated to each department after calculation of direct labor and direct material. Manufacturing Overheads will include indirect labor and material, while, the supporting expenses will include rentals, insurance, depreciation and amortization, advertis ing and marketing, general administrative and others etc. followed by miscellaneous expenses (Ross 2009); (Grover, 2010).

Tip Assignment Example | Topics and Well Written Essays - 500 words

Tip - Assignment Example The practice has become a common thing to diners, waiters and other customer servers and customers, alike. Yet there are different reactions to it that it is interesting to note and learn from what people think about the matter. For the receiver of the tip, it is always a welcomed blessing for them to be given a tip for whatever service they have given. To some, it is considered a just compensation for what they did because whether they work well or not, their salary is often low. Thus, better performances are compensated through tips. However, there are also some who look at customers demandingly, thinking that it is but right for customers to give them tips because of the little favors they have done expecting to be paid in return. Still for others, tips can become a motivation for them to do even better in giving services. This brings problems to the attitude of employees towards customers. Sometimes, workers tend to do better when they serve potential clients whom they think would be benevolent enough to give more money but they would not give their best efforts in serving ordinary people. This brings problems that make customers feel discriminated and unsatisfied which in general affects the waiters, r eceptionists and other employees in being perceived negatively. On the other hand, the givers also have different reactions to tips. Some people think about it as a form of begging because they perceive tipping as a forced additional payment that they are obliged to give to the people who served them. Oftentimes, such reactions come from the similarly hard-working people who are not paid very well. However, there are also those who give tips grudgingly considering that they worked harder than the people who served them therefore, they are more entitled to the money than the one who served them. There is the perception that such employees are paid by their employers so they should not give more money to

A Critical Evaluation of Charles De Gaulles Handling of the Algerian Insurrection :: European Europe History

A Critical Evaluation of Charles De Gaulle's Handling of the Algerian Insurrection The 1950s was not a particularly good decade for France. The Fourth Republic, which had been established in the aftermath of the Second World War, remained unstable and lurched from crisis to crisis. Between 1946 and 1954, there had been a war in French Indo-China, between a nationalist force under Ho Chi Minh and the French. The war was long and bitter and towards the end, the French suffered the ignominy of losing the major fortress of Dien Bien Phu to the guerrillas on 7 May 1954. An armistice was sought with Ho Chi Minh, and the nations of North and South Vietnam emerged from the ashes of the colony. It is entirely likely that the success of the guerrillas influenced the Algerian insurrectionists, the National Liberation Front(FLN), in tactics and in the idea that the time was ripe to strike. It is clear that the FLN employed similar methods to those developed by the nationalists under Ho Chi Minh.1 For several months, France was at peace. The insurrection began on 1 November 1954. The insurrection precipitated the fall of the Fourth Republic. Charles de Gaulle, hero of the Second World War, became President of France in 1958, and was intent on securing a political solution to the insurrection, rather than one based on force. His efforts were largely successful in avoiding a civil war in France, and ending the insurgency - although it took four years to do so. It has been estimated that more than a million Algerians died in the insurrection.2 Before 1954, Algeria was not considered to be a French colony - rather it was seen as an integral part of France. The region was composed of departments, like those of the mainland. There were over a million white French nationals living in Algeria at the time and around eight million Muslims.3 This was a greater proportion of French nationals than in the other major North African colonies of France - Morocco, and Tunisia.4 Although there were benefits to remaining with France, the colonial administration was heavily weighed against the Muslims - particularly with regards to voting rights. In 1936, for instance, the Popular Front Government of Blum introduced legislation to the Assembly proposing to extend French citizenship to over twenty thousand Algerian Muslims.5 The initiative failed when all the European mayors of Algerian towns resigned in protest.

People with Learning Disability Essay

To make sure that people with learning difficulties are able to live in their flats independently and not go through any abuse, there are various strategies to help them such as: Protection of Vulnerable Adults scheme (POVA) The Protection of Vulnerable Adults (POVA) scheme was July 2004 was introduced to protect vulnerable adults such as people with learning disability who are aged 18 years and over in care settings. Employers or managers are required to check the POVA list when employing workers, carers or volunteers who are in regular contact with vulnerable adults. They also have a responsibility to refer care workers to the POVA list if they have harmed vulnerable adults in their care. When an individual’s name is placed on the POVA list, that person is not able to work with vulnerable adults until his or her name is removed from the list. The POVA scheme is designed to give significantly greater protection to vulnerable adults. Employers have a duty to check that potential new care workers are not on the POVA list before allowing them to work in a care position. They will have to do it as part of the CRB Disclosure application process. Multi-agency working Multi-agency working means different services, agencies, teams of professionals and other staff working together to provide services that meet the needs of vulnerable adults. As multi-agency working supports vulnerable adults such as learning disabled people, it puts them at the centre of decision making in order to meet their needs and improve their lives. Multi agency working encourages problems to be identified early and can be intervened. They share and manage information and keep the information up to date. They keep in track any improvements the clients have made or any improvements that needs to be made. They co-operate with each other. So, if there is any suspicion of abuse, they use the same strategies to deal with the abuse and safeguard adults from any harm or danger. In this way, it helps to minimise the potential for abuse. Working practices needs assessment Service users needs must be assessed so that we are able to know their strengths. We can also find the areas where they need help and support and plan appropriate levels of support to improve the service users’ lives. Their needs are assessed to monitor if they are improving or getting worse. If the service user’s needs are not considered or met properly then abuse such as physical, financial, psychological abuse, etc can occur intentionally or unintentionally, which can deteriorate the health of the service user. When assessing the needs of the service users, it is important to identify the vulnerability of the service user so that further steps can be taken to avoid any risk of potential abuse. In this way, needs assessment is vital when care planning for service users. Oral/Written/Electronic communication Communication is an important way of minimising any potential abuse. Effective communication with service users and others involved in their care is essential. We are able to find out their needs and problems if we are able to communicate with them effectively. The information of the service user must only be given to people who need to know about the service user. It should be kept safe and confidential from other people and prevent any risk of harm or danger. For example, keeping information in computers with passwords, etc. Working in partnership with service users It is important that care professionals work in partnership with service users so that they can gain trust from them and feel more empowered. This way they are able to feel more confident when talking about their problems and worries. From this, we are able to find out if they are being abused. They wouldn’t hesitate when talking about the abuse. Partnership with service users also means care professionals helping service users to recognise when a relationship is abusive. Care workers can help them to know more about how to protect themselves by knowing their rights and how to complain. Thus, potential abuse can be minimised by working in partnership with service users. Strategies between professionals and within organisations It is vital to have effective communication between professionals and organisations so that service user is protected. When there are any changes such as improvement in service users or degrading in their health conditions or if there is a suspicion of abuse, information must be shared by communication. By communicating, they are able to monitor the service user’s well being and they can be up to date with information of service users. They are able to take action and ensure that service user’s needs are met.

Bite Me: A Love Story Chapter 12

12.Alchemy The Chinese herb shop smelled like licorice and dried monkey butt. The Animals were piled into the narrow aisle between counters, trying to hide behind Troy Lee's grandmother and failing spectacularly. Behind a glass case, the shopkeeper looked older and more spooky than Grandma Lee, which none of them thought possible until now. It was like he'd been carved from an apple, then left on the windowsill to dry for a hundred years. The walls of the shop were lined, floor to ceiling, with little drawers of dark wood, each with a small bronze frame and a white card with Chinese characters written on it. The old man stood behind glass cases that held all manner of desiccated plant and animal bits, from whole sea horses and tiny birds, to shark parts and scorpion tails, to odd spiky bits that looked like they'd been flown in from another planet. â€Å"What's that?† Drew asked Troy Lee from under a veil of stringy blond hair. He pointed to a wrinkled black thing. Troy Lee said something in Cantonese to Grandma, who said something to the shopkeeper, who barked something back. â€Å"Bear penis,† said Troy Lee. â€Å"Should we score some?† asked Drew. â€Å"For what?† asked Troy. â€Å"An emergency,† said Drew. â€Å"Sure, okay,† said Troy Lee, then he said something to Grandma in Cantonese. There was an exchange with the shopkeeper, after which Troy said, â€Å"How much do you want? It's fifty bucks a gram.† â€Å"Whoa,† said Barry. â€Å"That's expensive.† â€Å"He says it's the best dried bear penis you can buy,† said Troy Lee. â€Å"Okay,† said Drew. â€Å"A gram.† Troy passed the order through Grandma to the shopkeeper. He snipped a tip off a bear penis, weighed it, and placed it on the pile of herbs in the sheet of paper he had laid on the counter for Drew. Grandma's paper was much larger, and the shopkeeper had been tottering around the shop for half an hour gathering the ingredients. At one point when the old man was up on the top of the ladder at the far back corner of the shop, the Animals had leapt the counter and laced their arms together as a human rescue net, which served only to scare the bejeezus out of the shopkeeper and set Grandma off in a tirade of Cantonese scolding, to which they all responded like dogs, paying her rapt attention and tilting their heads as if they actually had some idea of what the fuck she was talking about. Lately the Animals had been all about saving lives. Most of the time, guys their age would be fairly convinced of their immortality, or at least oblivious of their mortality, but since being murdered by a blue hooker turned vampire, then resurrected as vampires, then restored to living by Foo Dog's genetic alchemy, they had been feeling what they could only describe as Jesusy. â€Å"I'm feeling extra Jesusy,† said Jeff, the tall jock. â€Å"I always feel extra Jesusy,† said Clint, who always did. â€Å"Yeah, extra Jesusy, bitches! Let's go save some mother-fuckers!† Lash had shouted, which had sort of embarrassed everyone a little, since they had been sitting around a table in Starbucks at the time, discussing the attack of the cat cloud and the information they'd exchanged with the two homicide cops. â€Å"It's up to us,† Lash added softly, sort of slinking into his hoody and putting on his shades. Now they watched as the old shopkeeper folded up Grandma Lee's bundle of ingredients and tucked in the paper so it was as tight as a toothpick spliff, then flipped the package over and wrote some Chinese characters on the back with a carpenter's pencil. â€Å"What's it say?† Barry asked Troy Lee. â€Å"It says, ‘vampire cat remedy.'† â€Å"No shit?† â€Å"Yeah. Then there's a bunch of warnings about side effects.† An hour later they were sitting around the Lee kitchen table, waiting for the big twenty-quart soup pot on the stove to come to a boil. Grandma Lee rose from her chair and tottered over to the stove with her package of herbs. Troy Lee joined her, helped her unwrap the package, and held the paper away from the burner as she scooped handfuls of herbs and animal parts into the boiling water. Foul and magical fumes bubbled out of the kettle, like the flatulence of dragons on a demon-only diet. â€Å"This really going to work, Grandma?† Troy Lee asked in Cantonese. â€Å"Oh yeah. We used it when I was a girl in China and some vampire cats invaded the city.† â€Å"And they still have the recipe in a shop down on Stockton Street?† â€Å"It's a good recipe.† She scooped the last of the package into the water. â€Å"How do you use this stuff, anyway?† â€Å"With firecrackers.† â€Å"It's wet, how are you going to use firecrackers?† â€Å"I don't know how, I just like firecrackers.† The Animals covered their noses and started filing out of the kitchen. â€Å"That smells like fermented skunk ass,† said Jeff. Grandma said something in Cantonese, followed by â€Å"My bitches,† pronounced in frighteningly accentless English. â€Å"What? What'd she say?† asked Jeff. â€Å"She says, ‘That's how you know it's a good recipe, gents,'† said Troy Lee. THE EMPEROR A dark basement. A thousand sleeping vampire cats. One formerly human vampire. One huge, shaved vampire-cat hybrid. Five matches left. No way out. A half hour, maybe less, until sundown. The Emperor was not a man to use profanity, but after he assessed his situation and burned his fingers with his fourth to last match, he said, â€Å"Well, this blows.† There was no helping it, sometimes a man, even a brave and noble man, must speak the harsh truth, and his situation, did, indeed, blow. He'd tried everything he could think of to escape the basement, from building a stairway to the window with empty fifty-five-gallon drums, to screaming for help like a man on fire, but even on a platform of oil drums he couldn't find the leverage or the strength to move the Dumpster away from the window. He could hear Bummer and Lazarus whimpering outside in the alley. All the other windows had been bricked up, all the steel fire doors were bolted, and, of course, the elevators and cables were long gone from the shafts (which he'd discovered after an hour prying the doors open with a metal support bar he'd taken off one of the shelves where Tommy Flood lay curled up with the Chet-thing). A dusty spray of twilight filtered down the elevator shaft from somewhere above, and it was by this that the Emperor ascertained that there was no way to climb the shaft, and that now it was dangerously close to sundown, as the light had turned a dim orange color. He would fight, oh yes, he would not go down without a battle, but even the magnificently agile little swordsman had gone down to the attacking pounce of cats. What chance did he stand in the dark with only a metal bar? He'd already checked the empty oil drums for accelerants, hoping he might burn his enemies before they awakened, but he'd had no luck. The barrels had had dry goods or something solid in them, and even so, he wasn't sure how he'd avoid being suffocated by burning cat fumes. Then, in thinking about how he might escape the flames, it occurred to him how he might escape. He made his way back to the storeroom where Chet and Tommy lay, and lit one of his precious matches to get his bearings. Yes, there was still a bolt on the door, and in addition there were enough barrels and shelves to construct a barricade beyond that. The match went out and he felt his way across the room until he touched Tommy's back-cold flesh. He took his ex-friend under the armpits and dragged him off the shelf and across the room, bumping through the door-way as he went. He shoved the body to the side and cringed with the crunch it made, falling onto the immobile bodies of dead cats. Back through dark, feeling around until he found Chet's fur. He felt for what he thought were the front paws, then backed across the room again, the huge shaved vampire cat in tow. Chet was lighter than Tommy had been, but not by much, and the Emperor was winded. He couldn't afford to sit. The ray of light in the elevator shaft had gone deep red. He heard Bummer let out a ruff beyond the window. â€Å"Run, men, away! Go away from this place. I'll find you in the morning. Go!† He never raised his voice to the men, even when they were in peril, and he heard Lazarus whimper at his command, but then the sound of Bummer growling while being dragged away by the scruff of his neck. He would get the message after a block or so. The men were safe. He pulled the metal door shut, then yanked on it until he heard a click. Then spent the second to the last of his matches looking at the simple bolt, and taking a last look around the room, trying to memorize the layout of the barrels and shelves that he would have to move in the dark. As the match burned out, he heard stirring in the room outside. There was a rack of metal shelves to the right of the door. He grabbed them and overturned them in the doorway. Yes, the door opened out, but what could it hurt. The more he put between himself and the vampire cats, the better. He scooped up armloads of the clothing at his feet and tossed them over the shelves, then backed across the room, throwing everything he touched in front of him, as if he were tunneling out the other side. Finally, he crawled up in the heavy shelf where Tommy and Chet had been and crouched, facing the door. He felt for the handle of the kitchen knife that he'd tucked in his belt at the small of his back, drew it, and held it before him. There were distinct cat noises-yowls, hisses, and meows, coming from the room outside. They were awake, up, and moving. There was a tentative scratch at the door, then a whirr of scratching, like someone had turned a power sander on outside, then it stopped as quickly as it had started and all he could hear was his own breathing. No. There was movement. The slight rustle of cloth, then a low, trilling purr. And it was coming from inside the door, he was sure of it. The Emperor clamped the knife in his teeth and lit his last match. The room was as he thought it would be, a pile of debris and barrels, but swirling out from under shelving in front of the door was a layer of mist, moving across the floor toward him, undulating in tiny waves that approximated the sound of a purr.