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  • Which is the most suitable option here? Vacuum receivers shall be capable of withstanding a gage vacuum of ________ inches of mercury.
    Which is the most suitable option here? Vacuum receivers shall be capable of withstanding a gage vacuum of ________ inches of mercury.
    The correct answer to this question is C. However, the use of mercury manometers/McLeod gauges is discouraged due to the toxic nature of mercury and safety issues involving the storage, use, and replenishing of mercury-containing devices. Consider using electronic and mechanical gauges that offer continuous and convenient vacuum level monitoring. Operate vacuum pumps only in places with good ventilation. Due to the heat generated by operating pumps, do not store volatile, corrosive, unstable, or flammable substances near them. Suctioning is an important part of daily patient care and in many cases can be a potentially lifesaving procedure. A thorough understanding of the physics involved in creating suction, the factors affecting flow rate, and the clinical applications of negative pressure will make the procedure more effective and as safe as possible.

  • Runouts from horizontal mains or branches shall be taken off ________ the centerline of the pipeline.
    Runouts from horizontal mains or branches shall be taken off ________ the centerline of the pipeline.
    Runouts from horizontal mains shall be taken off above below or at the centerline of the pipe

  • Are all gases insulators?
    Are all gases insulators?
    No! It is not necessary that all gases are insulators. Although, it’s all true that most gases are bad conductors of electricity and only a small number of gases can conduct electricity. Gases conduct electricity only when we subject them to lower pressure and higher voltage. Gases are very poor conductors of electricity at normal atmospheric pressure due to the deficiency of free electrons to carry current across. But, we can produce free electrons in the gaseous state by applying the above-mentioned ways. Low Pressure increases the interatomic distances and the applied higher voltage excites the particles which lead to more interatomic collisions increasing the K.E. of the particles which ionizes the atoms.

  • Which contains the largest number of molecules? Consider three one-liter flasks at STP. Flask A contains NH3 gas, flask B contains NO2 gas and flask C contains N2 gas.
    Which contains the largest number of molecules? Consider three one-liter flasks at STP. Flask A contains NH3 gas, flask B contains NO2 gas and flask C contains N2 gas.
    The answer to this question is letter B. All three flasks are measured 1 liter and are placed in the same room making them have the same temperature too. All 3 flasks have also the same number of molecules as they contain the same element (Nitrogen) and have the equal volume as well. This is a need for solving their mass by using the Avogadro’s Law. Following the Avogadro’s Law, Flask A that has the NH3 gases is 17 g/mol, Flask B with NO2 is 46 g/mol and Flask 3 or with the N2 gas is equal to 28 g/mol. Based on the following answers, Nitrogen Dioxide has the largest number of molecules.

  • What is the difference between NGV and LPG?
    What is the difference between NGV and LPG?
    NGV is known to mean Natural Gas Vehicle. LPG is known as Liquid Petroleum Gas. The NGV tank usually contains natural gas and it is expected to be heavier. It is expected to be thicker too because the pressure inside the tank is also stronger because this is made out of gas. LPG tanks are not too heavy but it does not mean that they are not dangerous when they are not handled properly. These two types of gas tanks should be handled correctly to ensure that no accidents will occur while they are being transported from one place to another. The LPG is normally used by people who still have gas ranges at home. NGV is used as an alternative type of vehicle from the usual vehicles that we have.

  • What is the difference between Gas and Vapor?
    What is the difference between Gas and Vapor?
    At room temperature, a gas is just one defined state, while vapor is a substance that has gaseous and liquid equilibrium, due to experiencing a phase change. Gas is also known for being a single element of matter. This element has its own defining chemical and physical properties. Examples of these gases include neo and oxygen. Vapor is the element's gaseous state. While they have a definite shape, gas particles don't. Instead, they are a collection of atoms, molecules, and electrons. Gas produces when the temperatures kinetic energy is too high to stay a liquid, while vapor is produced from the pressure of a substance.

  • What is the difference between Gas and Liquid?
    What is the difference between Gas and Liquid?
    Everything in our environment, including man himself is made up of what we call matter. Matter is popularly defined as anything that has mass and occupies space. There are three different forms or states of matter, which are solids, liquids, and gases, whose characteristics depend on the forces of attraction between their molecules. There are four major points whereby we can differentiate between gases and liquids at the highest basic level, which are shape, hardness, volume and the capacity to flow. The force of attractions between the molecules of a liquid is less than that of solid though, but the force of attraction is less than that of gas. Thus, this also implies that gases have the weakest form of attractions among the three states of matters. Though this two have no definite shape, as they only take the shape of the container in which they are contained, liquids have a definite volume, but gasses do not. Also, gases can be more easily compressed than liquids.

  • What is the pressure of the atmosphere? A glass column is filled with mercury and inverted in a pool of mercury. The mercury column stabilizes at a height of 735 mm above the pool of mercury. 
    What is the pressure of the atmosphere? A glass column is filled with mercury and inverted in a pool of mercury. The mercury column stabilizes at a height of 735 mm above the pool of mercury. 
    The answer to this question is C. To understand how this question, you need to know how to solve this. 1 atm is equal to 760mm Hg. This means 735x 1/760=0.967 atm. It would be easy to solve this already as long as you know the right equation to use. Measuring atmospheric pressure is essential because this will have some effects on water chemistry as well as the different weather conditions that may be experienced. Various gases may dissolve more in higher atmospheric pressures as compared to low atmospheric pressures. Do remember that air temperature usually decreases in more upper atmospheres.

  • What are the properties of gases?
    What are the properties of gases?
    Matter can be in the form of a liquid, solid or gas. Each of these types of matter have certain specific properties that identify it as a liquid, solid or gas. Gases have specific properties including having a low density. The molecules in a gas are scattered about and are not tight or compact. Therefore, the gas is not dense. Also, the gas does not have a specific shape. Since the molecules are not compact, it would not form a shape or have a certain type of volume. Gases also allow it to be compressible and expandable. Since there is low dense, the gas can be compressed. Diffusion is also something that can happen to a gas due to its configuration. There is high pressure in a gas.

  • Which of the three single flasks do the molecules have the greatest mass, the greatest average velocity, AND the highest kinetic energy if Three 1.00 L flasks at 25oC and 725 torr contain the gases...
    Which of the three single flasks do the molecules have the greatest mass, the greatest average velocity, AND the highest kinetic energy if Three 1.00 L flasks at 25oC and 725 torr contain the gases...
    The correct answer to this question is E, None. Gases in chemistry are one of the three states of matter that have no defined volume or shape. Each gas has a standout behavioral pattern. This behavior can depend on many variables including temperature, size, and pressure. Though their actions are different, all gases act the same. Particles are what makeup gas. These particles can be various things including molecules and atoms. There are multiple types of gases, including elemental gases, which are elements that become gases at standard pressure and temperature. Examples of elemental glasses include hydrogen, xenon, and krypton.

  • In which flask do the molecules have the highest average kinetic energy? Consider three one-liter flasks labeled A, B, and C filled with the gases NO, NO2, and N2O, respectively, each at STP.
    In which flask do the molecules have the highest average kinetic energy? Consider three one-liter flasks labeled A, B, and C filled with the gases NO, NO2, and N2O, respectively, each at STP.
    In a science experiment, you have three flasks that are filled with different gases in them. If you have some form of nitrous oxide in them, they will have the same kinetic energy. However, there are different amounts of kinetic energy in gases. Kinetic energy is the energy that most people think of when they think of power. It is the energy that occurs when it is in motion. Gas is free-flowing just like a liquid. This means that the molecules are moving about. Even though NO, NO2, and N2O are different gases, they all have the same amount of movement. NO2 is called nitrogen dioxide based on the number of molecules it has in it. N2o is nitrous oxide. NO is nitric oxide.

  • Which of the following gases in come out in elemental or compound form during volcanic eruption? 1. Sulphur 2. Nitrogen 3. Chlorine 4. Argon 5. Hydrogen
    Which of the following gases in come out in elemental or compound form during volcanic eruption? 1. Sulphur 2. Nitrogen 3. Chlorine 4. Argon 5. Hydrogen
    Elemental form means that the element is at its purest. A compound form is an element that is combined with other elements. Nitrogen is a light element that is common and can easily be found in the universe. Chlorine is a yellowish colored gas that reacts easily to other elements. When mixed with sodium, this becomes salt. Argon is another element that is found in the atmosphere. Argon is so common that it can be found more prevalent than water vapor. Many welding gases use argon. Hydrogen is the element that has an atomic number of one. Hydrogen is hard to spot since it is colorless and odorless. When a volcano erupts, it spews different elements into the air that come from the Earth’s crust including nitrogen, chlorine, argon and hydrogen.