Which of the following chemical agents is used for sterilization? a. chlorine b. ethylene oxide c. soap d. phenolics e. alcohol
Answers
Answer:
Ethyleneoxideisthechemicalagentsusedforsterilization.
Final answer:
Ethylene oxide is the chemical agent used for sterilization amongst those listed in the question. This gas sterilizes by disrupting the DNA of microorganisms. Other agents listed, such as chlorine, alcohol and phenolics are generally considered disinfectants, not sterilants.
Explanation:
Out of the chemical agents listed, ethylene oxide is the one commonly used for sterilization. Ethylene oxide is a gas that sterilizes by penetrating and disrupting the DNA of microorganisms, preventing them from reproducing. It is frequently used to sterilize medical and laboratory equipment, particularly items that cannot be sterilized by high heat such as plastic, electrical equipment, and delicate instruments.
While chlorine, alcohol, and phenolics can kill many microorganisms, they are generally considered disinfectants rather than sterilants because they may not kill all types of bacteria, viruses, fungi, and spores. Soap is typically used for cleaning, not specifically for its antimicrobial properties.
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Answers
Final answer:
Uranium (U) is found in the f-block of the periodic table, specifically in the actinide series.
Explanation:
Uranium (U) is found in the actinide series, which is located in the f-block of the periodic table. The actinide series consists of elements with atomic numbers from 89 to 103. Uranium is the 92nd element, making it part of this series. The f-block is located below the main body of the periodic table, between groups 3 and 4.
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Answers
Answer:
Mass of aluminium foil = 387.57_g
Explanation:
density of aluminium foil 2.70 g/cm³,
1_yd = 91.44_cm
1_in = 2.54_cm
Length of aluminum foil = 63.2_yd = 5779.008_cm
Width of aluminium foil = 11 in = 27.94_cm
Thickness of aluminium foil = 0.00035_in. = 0.000889_cm
Volume of aluminium foil = length × width × thickness = 5779.008_cm × 27.94_cm × 0.000889_cm = 143.54_cm^3
Mass of aluminium foil = (volume of aluminium foil) × (density of aluminium foil) = 143.54_cm³ × 2.70 g/cm³ = 387.57_g
Final answer:
To find the mass of the aluminium foil, calculate the volume and multiply it by the density. The mass of the foil is 0.3878 grams.
Explanation:
To find the mass of the aluminium foil, we need to calculate the volume and then multiply it by the density. First, let's convert the dimensions to the same unit. The aluminium foil is 63.2 yd long, which is equivalent to 190.4 ft. The width is 11 in, which is 0.92 ft, and the thickness is 0.00035 in, which is 2.92e-5 ft.
The volume of the foil can be calculated by multiplying the length, width, and thickness.
V = (190.4 ft) * (0.92 ft) * (2.92e-5 ft).
This gives us a volume of 5.0634e-3 cubic feet.
Next, we need to convert the volume to cubic centimetres because the density is given in g/cm³.
There are 28.3168 cubic centimetres in one cubic foot, so the volume in cm³ is
5.0634e-3 * 28.3168 = 0.1433 cm³.
Finally, we can calculate the mass by multiplying the volume by the density.
Mass = 0.1433 cm³ * 2.70 g/cm³ = 0.3878 grams.
So, The mass of the foil is 0.3878 grams.
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b. there is no net change in the amount of substrates or products.
c. the reaction has stopped.
d. there are equivalent amounts of substrates and products.
Answers
Answer: b. there is no net change in the amount of substrates or products.
Explanation:
The reactions which do not go on completion and in which the reactant forms product and the products goes back to the reactants simultaneously are known as equilibrium reactions.
Equilibrium state is the state when reactants and products are present but the concentrations does not change with time.
For a chemical equilibrium reaction, equilibrium state is achieved when the rate of forward reaction becomes equals to rate of the backward reaction.
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Answer:
Explanation:
on is unique among the elements in several significant ways:
Abundance: Iron is one of the most abundant elements on Earth. It makes up a substantial portion of the Earth's core and is also prevalent in the Earth's crust, where it occurs in various minerals.
Nuclear Stability: Iron is unique in terms of nuclear stability. Iron-56 (^56Fe) has the highest binding energy per nucleon (the energy that holds the nucleus together) of any known nuclide. This makes iron-56 particularly stable, and nuclear reactions that either fuse lighter elements into iron or break down heavier elements into iron release energy, making iron a "nuclear sink" for energy.
Transition Metal: Iron is classified as a transition metal. Transition metals are characterized by their partially filled d-orbitals, which contribute to their ability to form colorful compounds and act as catalysts in various chemical reactions.
Magnetic Properties: Iron, along with a few other elements, exhibits strong magnetic properties. It can become magnetized when exposed to a magnetic field and is used in the construction of permanent magnets.
Biological Significance: Iron is essential for many biological processes. It plays a crucial role in transporting oxygen in the blood (hemoglobin and myoglobin), as a cofactor in enzymes involved in energy production (cytochromes), and in various cellular processes. The biological requirement for iron makes it a vital element for living organisms.
Role in Stellar Nucleosynthesis: Iron is a critical element in the process of nucleosynthesis within stars. It is often referred to as the "nuclear bottleneck." Elements lighter than iron are typically fused together in the cores of stars, releasing energy, while elements heavier than iron are created in supernova explosions. Iron is the point at which fusion reactions cease to release energy, making it a crucial boundary in stellar evolution.
Industrial Significance: Iron and its alloys (such as steel) have been fundamental to human civilization for thousands of years. Iron is widely used in construction, manufacturing, transportation, and numerous other industries due to its strength, versatility, and abundance.
Magnetic Resonance Imaging (MRI): Iron's magnetic properties are also exploited in medical technology. In MRI machines, the presence of iron in the body's tissues can be detected and used to create detailed images for medical diagnosis.
These unique characteristics and its widespread presence in the natural world make iron a highly significant and versatile element in both scientific and industrial contexts.
What substance is it?
Answers
Going by the density, the cube is made of Aluminium - density is a fairly unique quantity
Answer: aluminum and 2.7
Explanation: