Balance and classify this reaction:
C6H6 +02 →CO2 +H₂O

Answer:

Friction always slows a moving object down. ... Friction can be a useful force because it prevents our shoes slipping on the pavement when we walk and stops car tyres skidding on the road. When you walk, friction is caused between the tread on shoes and the ground. This friction acts to grip the ground and prevent sliding.

Answer:

See explanation

Explanation:

Period 3 elements include; Na, Mg, Al, Si, P,S,Cl and Ar

Across the period, the chlorides of the elements change from solid to gas. The chlorides of metals are solid while the chlorides of non metals are gaseous.

Also, the chlorides become more volatile across the period. The formulas of the chlorides change from MCl to MCl2 to MCl3 to MCl4, MCl5 and MCl6 respectively across the period where M is a period 3 element.

The pH of the solutions of chlorides of period 3 elements change from neutral to acidic across the period. The pH of the chlorides of metals are neutral while the chlorides of the nonmetals usually yield acid solutions.

You would need to add 250 mL of water.

The mass of slaked lime will be 29.6 g.

What is mass?

The mass of a thing is the quantity of matter as well as a substance that makes it up. It is expressed in kilograms, which may be abbreviated as kg. It's crucial to keep in mind that mass is not the same as weight. Although mass remains constant, weight fluctuates due to variations in gravity.

The given chemical equation is

CaO(s)+H2O(l) → Ca(OH)2(s)

No of moles of H2O = 10.9 g/ 18 g = 0.606 mol.

No of moles of CaO = 22.4 g / 56 g = 0.4 mol.

Here, CaO will be limiting reagent.

Mass of slaked lime can be calculated as:

Mass  =  0.4 mol × (40 +16 × 2 + 2)

Mass = 29.6 g.

Therefore, the mass of slaked lime will be 29.6 g.

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Answer:

A self-inflicted wound

Explanation:

Normally different killing methods or angles of shots have different splatters or spots.

The ratio between 1 and 2 half lives that have elapsed since the mineral contained 100% parent atoms.

Let us consider that the parent isotope decays into the daughter isotope through a process of radioactive decay with a constant half-life.

we can use the fact of the half life which is the proportion of parent to daughter isotopes which changes over the time. We have to determine that how many half-lives have elapsed since the mineral contained 100% parent atoms.

We have the proportion of parents to daughter isotopes in the mineral is 40% parent and 60% daughter. So the ratio becomes 2:3 parent to daughter isotopes.

Calculating the current ratio of 2:3 is closest to the ratio of 1:3 which occurs after two half-lives of the mineral. So we get the ratio between 1 and 2 half-lives which have elapsed since the mineral contained 100% parent atoms.

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The electron configuration of a chloride ion can be represented by the following notation: 1s² 2s² 2p⁶ 3s² 3p⁶.

Chloride is an ion formed when the element chlorine gains an electron from another element. Chlorine gains an electron in its outer shell, resulting in a stable electronic structure.The electronic configuration of a chloride ion is similar to that of a noble gas, except that it has one fewer electron. The electronic configuration of a chloride ion is the same as that of an argon atom.Chloride ions are commonly found in nature, particularly in seawater. Chloride ions are necessary for a variety of bodily processes, including maintaining the body's pH and fluid balance, as well as transmitting nerve impulses.The chloride ion is essential for maintaining a healthy body, but excessive intake can be harmful. Many people consume too much salt, which contains chloride, and this can cause a variety of health problems, including high blood pressure, heart disease, and stroke.Electronic structure of chlorideThe chloride ion, denoted as Cl–, has eighteen electrons. The electron configuration of a chloride ion can be represented by the following notation: 1s² 2s² 2p⁶ 3s² 3p⁶.

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The benefits of synthetics are numerous; they have properties not found in nature, allowing us to make things stronger, lighter, more fuel-efficient, shiner, and longer lasting. At the same time, we contribute to global pollution, have an impact on animal and human health, and require energy to produce.

The majority of synthetic fibers are pliable. Most synthetic fiber fabrics do not wrinkle easily.

Fabrics made of synthetic fibers are typically more durable, less expensive, and more widely available than natural fiber fabrics. The majority of synthetic fibers can withstand heavy loads without breaking.

Thus, The benefits of synthetics are numerous; they have properties not found in nature, allowing us to make things stronger, lighter, more fuel-efficient, shiner, and longer lasting.

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The wavelength of the photon of light with an energy of 2.04 eV is approximately 6.08 x 10^-7 meters.

To find the wavelength of a photon of light with energy 2.04 eV, we can use the equation:

E = hc/λ

Where:

E is the energy of the photon,

h is Planck's constant (6.63 x 10^-34 J.s),

c is the speed of light (3 x 10^8 m/s),

λ is the wavelength of the photon.

First, we need to convert the energy from electron volts (eV) to joules (J):

1 eV = 1.6 x 10^-19 J

Energy (E) = 2.04 eV * (1.6 x 10^-19 J/eV) = 3.264 x 10^-19 J

Now, we can rearrange the equation to solve for the wavelength (λ):

λ = hc/E

λ = (6.63 x 10^-34 J.s * 3 x 10^8 m/s) / (3.264 x 10^-19 J)

Calculating this expression:

λ ≈ 6.08 x 10^-7 meters

Therefore, the wavelength of the photon of light with an energy of 2.04 eV is approximately 6.08 x 10^-7 meters.

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The correct answer to the question is: The density of Block A is equal to the density of Block B.

The density of an object is defined as the mass per unit volume of the object. Mathematically, it is expressed as:

To know which option is correct, we shall determine the density of block A, B and C.

Mass of A = 2 Kg

Length = 5 cm

Height = 2 cm

Width = 1 cm

Volume = 5 × 1 × 2

Volume of A = 10 cm³

Density = mass / volume

Density = 2 / 10

Mass of B = 2 Kg

Length = 1 cm

Height = 5 cm

Width = 2 cm

Volume = 1 × 2 × 5

Volume of B = 10 cm³

Density = mass / volume

Density = 2 / 10

Mass of C = 3 Kg

Length = 5 cm

Height = 1 cm

Width = 2 cm

Volume = 5 × 2 × 1

Volume of C = 10 cm³

Density = mass / volume

Density = 3 / 10

Density of A = 0.2 Kg/cm³

Density of B = 0.2 Kg/cm³

Density of C = 0.3 Kg/cm³

From the above calculations, we obtained the following:

1. The density of block A and B are equal.

2. Block C has the highest density.

Thus, the correct statement is: The density of Block A is equal to the density of Block B.

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A buffer prevents the acidification of a solution when an acid is added by neutralizing excess hydrogen ions (H+) from the acid. This maintains the solution's pH within a narrow range, ensuring that the solution does not become too acidic.

A buffer is a solution that is able to resist changes in pH when an acid or base is added to it. It does this by containing both a weak acid and its corresponding conjugate base, which can neutralize the added acid without significantly changing the pH of the solution. When an acid is added to a buffer solution, the weak acid component of the buffer will react with the added acid, producing its conjugate base. This reaction helps to prevent the acidification of the solution by maintaining a relatively constant pH level. Essentially, the buffer is able to absorb and neutralize the excess hydrogen ions produced by the added acid, thereby preventing the pH of the solution from becoming too acidic.

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Answer:

Mass= volume x density

Explanation:

Multiply the density by the volume.

The size of micropipette that you would select to deliver 215 microliters would be a micropipette with a volume range of 200-1000 microliters.

What is a micropipette?

A micropipette is a laboratory instrument used to measure and dispense small volumes of liquid, typically in the range of microliters (µL) or nanoliters (nL). They are commonly used in chemistry, biology, and biochemistry experiments, as well as in clinical and industrial settings.

Micropipettes consist of a handle, a digital or manual volume adjustment mechanism, and a tip that is placed into the liquid to be dispensed. They work by creating a vacuum or positive pressure inside the tip, which draws or pushes the liquid out of the tip.

Micropipettes come in different volume ranges and it is important to select the right one to ensure accurate delivery of the desired volume. For example, a micropipette with a volume range of 2-10 microliters would not be suitable for delivering 215 microliters, while a micropipette with a volume range of 200-1000 microliters would be more appropriate.

It's also important to note that, even if the micropipette is able to deliver 215 microliters, you should always check the calibration of the micropipette before use, to make sure that it's delivering the correct volume.

Hence, a micropipette with a volume range of 200-1000 microliters is suitable to deliver 215 microliters.

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Answer: Physical change

Explanation:  I said physical change because its changing the form of the substance and also solid to gas are sublimating

The statement "a glycosidic bond is a bond between the anomeric carbon of a carbohydrate and any other biological molecule" is true.A glycosidic bond is a type of covalent bond that forms between the anomeric carbon of a carbohydrate molecule and another molecule, such as another carbohydrate, a protein, or a lipid.

The anomeric carbon is the carbon atom in a carbohydrate molecule that was involved in the formation of the carbonyl group (C=O) during the cyclization of the sugar. The anomeric carbon can exist in two different configurations, alpha or beta, depending on the orientation of the hydroxyl group (-OH) attached to it. When the anomeric carbon reacts with another molecule, such as an alcohol or amine group of another carbohydrate, a glycosidic bond is formed.

Glycosidic bonds are important in the formation of complex carbohydrates, such as starch, glycogen, and cellulose, as well as in the synthesis of glycoproteins and glycolipids. The type of glycosidic bond formed between two carbohydrates can have significant implications for their biological function and the properties of the resulting molecule.

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After three half-lives, 12.5% of the original sample of polonium remains.

Polonium is a very infrequent natural element. It is found in uranium ores but it is careless to extract it. It is obtained by bombarding bismuth-209 with neutrons to give bismuth-210, which then purifies to form polonium. All the industrially produced polonium in the world is made in Russia.Po-210 is an effect of the radioactive decay of uranium-238, which decays to radon-222 and then to polonium. Polonium 210 has a half-life of 138 days. Let the opening value of polonium-218 be 100. First half-life. Therefore, 6.25 % of the original sample remains after 4 half-lives that are 12 minutes. Element Polonium has atomic Number 84, p-block, Mass number is 209.

So we can conclude that polonium is a radioactive, silvery-gray, or black metallic element of the oxygen group in the periodic table.

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Answer:

Humans, as well as monkeys, gorillas, and other primates, have a hand that can grip and grasp objects because they have an opposable thumb. The earliest primates were arboreal (they climbed trees), and so having grasping hands was an advantage in this environment.

Answer:

1-a

Explanation:

science to understand while tech. make the work easier

The number of moles of oxygen gas produced when potassium chlorate is heated is approximately 0.3807 mol.

To determine the number of moles of oxygen gas produced when potassium chlorate is heated, we need to consider the ideal gas law and the partial pressure of oxygen gas.

The balanced equation for the reaction is;

2 KClO₃(s) → 2 KCl(s) + 3O₂(g)

Given that the wet gas, including oxygen, is collected over water, we need to account for the partial pressure of water vapor. The total pressure is the sum of the partial pressures of oxygen gas and water vapor.

Given;

Temperature (T) = 20 °C = 20 + 273.15 = 293.15 K

Total pressure (Ptotal) = 757.0 mm Hg

Volume (V) = 7.96 L

Vapor pressure of water (Pwater) = 17.5 mm Hg

First, we need to calculate the partial pressure of oxygen gas (Poxygen):

Poxygen = Ptotal - Pwater

= 757.0 mm Hg - 17.5 mm Hg

= 739.5 mm Hg

Now, we can use the ideal gas law equation to find the number of moles of oxygen gas (n):

PV = nRT

n = PV / RT

where;

P is the partial pressure of oxygen gas (in atm)

V is the volume of the gas (in L)

R is the ideal gas constant (0.0821 L·atm/mol·K)

T is the temperature (in K)

Converting the pressure to atm:

Poxygen = 739.5 mm Hg / 760 mm Hg/atm

≈ 0.9724 atm

Now, let's calculate the number of moles of oxygen gas:

n = (0.9724 atm) × (7.96 L) / (0.0821 L·atm/mol·K) × (293.15 K)

Simplifying the calculation:

n ≈ 0.3807 mol

Therefore, the number of moles of oxygen gas produced when potassium chlorate is heated is approximately 0.3807 mol.

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It is appropriate to form double or triple bonds in a Lewis structure when four or six electrons are shared.

A Lewis structure is a representation of a molecule using dots to show the valence electrons in the molecule. This dots are shown around the symbols of the elements.

However, in instances where four or six electrons are shared between bonding atoms, a double or triple bond is used. A double bond means that four electrons are shared. A triple bond means that six electrons are shared.

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Answer:

Bro its expired milk duh

Explanation:

The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.

The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.

Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.

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Explanation:

Moles of Carbon used

= 48g / (12g/mol) = 4.0mol.

Moles of Oxygen used

= 128g / (32g/mol) = 4.0mol.

C + O2 => CO2

Therefore 4.0mol of CO2 is produced, which is equal to 91.2dm³ or 176g. (depending on gas or solid)

Answer:

faster because atoms move faster when heated . If the temperature of the salt is extremely hot, a thin layer of vapor will form on the surface, insulating the salt from the water.

Explanation:

The average rate of the reaction between 400 seconds and 1200 seconds is 0.19 M/s.

The average rate of the reaction between 400 seconds and 1200 seconds is the slope of the straight line connecting the concentrations at 400 seconds and 1200 seconds.

A graph of concentration vs. time data collected for the decomposition of H2O2 is shown below:

The graph shows the concentration of H2O2 decreasing as the reaction proceeds.

The slope of the straight line connecting the concentrations at 400 seconds and 1200 seconds is given by:

(0.22 - 0.41) M / (1200 s - 400 s) = -0.19 M/s

Therefore, the average rate of the reaction between 400 seconds and 1200 seconds is 0.19 M/s.

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Answer:

Dead bodies lose one degree Celsius per hour, which we could deduce that the person died 12 hours ago.

Explanation:

On the other hand, it is very important to take into account that this number of hours is very approximate, since not only does it vary greatly with the environment and the acclimatization of the environment in which the person dies, but also in this specific case, insulating clothing was presented , which made the loss of body heat much more difficult and could easily be more than 12 hours.

The minimum for this particular situation is 12 hours to 24 hours possible postmortem.

The scenario where a student follows a process that is different from the complete scientific process is the first option, where a student builds a circuit based on a drawing to learn how a circuit is built.

This is because the scientific process involves making observations, developing a hypothesis, testing the hypothesis through experimentation, and drawing conclusions based on the results.

Building a circuit based on a drawing does not involve any of these steps and is more focused on understanding the mechanics of building a circuit.

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Highly formalized and centralized structures similar to bureaucracies are known as mechanistic structures. So, correct option is A.

These types of structures are characterized by clear hierarchies of authority and control, standardized procedures and rules, and a rigid division of labor. In a mechanistic structure, decision-making is typically centralized at the top of the hierarchy, and there is a clear chain of command.

This type of structure is often used in organizations where efficiency and predictability are important, such as manufacturing and government agencies.

In contrast, organic structures are more flexible and adaptable, with decentralized decision-making and a greater emphasis on collaboration and teamwork. Matrix structures combine elements of both mechanistic and organic structures, allowing for greater flexibility and cross-functional collaboration.

Product structures, on the other hand, are designed around specific products or projects, with team members from different departments working together to achieve a common goal.

So, correct option is A.

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The balanced chemical equation for the standard formation reaction of solid water is: H₂ (g) + 1/2O(g) → H₂O(s)

The standard formation reaction of solid water is: H₂ (g) + 1/2O₂(g) --> H₂O(s)

The balanced chemical equation for the standard formation reaction of solid water is: H₂ (g) + 1/2O(g) → H₂O(s)

The standard enthalpy change of the above reaction can be determined from the enthalpies of formation of the products and reactants using Hess's Law.

Standard enthalpy of formation (∆Hfo) is defined as the amount of heat absorbed or released when one mole of a substance is formed from its constituent elements in their standard states under standard conditions (∆Hfo=0 at 298 K and 1 atm).

Since H₂O(s) is the standard state of water, its standard enthalpy of formation (∆Hfo) is -285.8 kJ/mol. This means that the formation of one mole of solid water releases 285.8 kJ of heat energy.

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