Please help!! This is for chem!!!

Answer:

3

Explanation:

Answer:

A. Heat … Get the answers you need, now! ... A. Heat was removed from the activation energy to create the product. ... C. The products have less energy than the reactants. D. The products have the same energy as the reactants.

Explanation:

Answer:

its B. Heat was added to create the product.

Explanation:

just took the test on edg2020 :)

The exponential decay rate for healthy human body is 0.1155 and the time taken  by 94% of the chemical consumed by the body to leave is 11.5 hours.

a) The exponential decay rate, often denoted as λ (lambda), can be calculated using the formula:

\(\lambda = \dfrac{ ln(2)} {t^{\frac{1}{2}}}\)

where ln represents the natural logarithm and \(t^\frac{1}{2}\) is the half-life of the chemical.

Substituting the given half-life value:

λ = ln(2) / 6

Using a calculator, we find:

λ ≈ 0.1155

So, the exponential decay rate is approximately 0.1155.

b) To calculate the time it takes for 94% of the chemical to leave the body, we can use the formula for exponential decay:

\(N(t) = N_{o} \times e^{-\lambda t}\)

where N(t) is the amount of chemical remaining at time t, N₀ is the initial amount of chemical, λ is the decay rate, and t is the time elapsed.

We want to find the time at which N(t) is 94% of N₀, which means:

0.94N₀ = N₀ \(\times e^{-\lambda t}\)

Cancelling out N₀:

0.94 = \(e^{-\lambda t}\)

Taking the natural logarithm of both sides:

ln(0.94) = -λt

Substituting the value of λ we found earlier:

ln(0.94) = -0.1155t

Now, solving for t:

t = ln(0.94) / -0.1155

solving the above equation, we get:

t ≈ 11.46

Therefore, the exponential decay rate for healthy human body is 0.1155 and it will take approximately 11.5 hours for 94% of the chemical consumed to leave the body.

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Complete question: The half-life of a certain chemical in the human body for a healthy adult is approximately 6 hr. a)What is the exponential decay rate b How long will it take 94% of the chemical consumed to leave the body?

Answer:

A. The color change from blue to green happens in nature.

Explanation:

The color change is an indicator of a chemical reaction that has occurred. Although color changes are not necessarily good diagnostic tool to measure if a chemical reaction has occurred or not.

The evidence that shows that a chemical reaction has taken place is the disappearance of the steel wool shows that a new substance has formed.

The electrochemical series is arrangement of elements in order of decreasing reactivity. It is important to note that the elements that are high up in the electrochemical series can displace the elements that are lower in the series from their aqueous solution.

Steel contains iron which lies above copper in the electrochemical series hence a chemical change occurs when steel dissolves in the copper solution.

Hence, the evidence that shows that a chemical reaction has taken place is the disappearance of the steel wool shows that a new substance has formed.

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Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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Answer:

1.37dm³

Explanation:

To solve this problem, let us write the reaction expression:

               2KClO₃  →   2KCl  + 3O₂

Now, mass of KClO₃ is 5g, let us find the number of moles;

  Number of moles  = \(\frac{mass}{molar mass}\)  

  Molar mass of KClO₃  = 39 + 35.5 + 3(16) = 122.5g/mol

 Now;

 Number of moles  = \(\frac{5}{122.5}\)   = 0.04mole

  So;

       2 moles of KClO₃  will produce 3 moles of oxygen gas

       0.04 mole of KClO₃  will produce \(\frac{3 x 0.04} {2}\)   = 0.06moles

At STP;

        1 mole of gas has  a volume of 22.4dm³

       0.06 mole of oxygen gas will have a volume of 22.4 x 0.06 = 1.37dm³

Answer:

c

Explanation:

just smart like that

Answer: The correct answer is "Courts."

Explanation:

The number of oranges to be eaten each week to meet the requirement is 7.

Mass of vitamin C is 70 mg.That is it is equal to 0.070 g.

as 1 mg=1×10\(^-3\) g. And 60 mg is equal to 0.060 g according to this conversion.

The mass of orange in ounces is given as 3 oz.

As 1 oz=28.3495 g.Therefore,3 oz=(3×28.3495)g

which is equal to 85.045 g.

Given that 100 g orange has 0.070 g of vitamin C.Mass of vitamin C in 85.045 g of oranges is,

                               0.070/100×85.045=0.0595 g

Vitamin C consumed in 1 day is 0.060 g. Therefore in a week vitamin C consumed is 7×0.060=0.42 g.

To calculate the number of oranges to be eaten in a week it is calculated as,

Number of oranges=mass of vitamin C consumed in a week /mass of 3 oz oranges

Number of oranges=0.42 g/0.0595 g

                              =7.05≈7

Therefore,number of oranges to be eaten in a week are 7.

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Answer:

Explanation:

The sketch of the curve for two Br atoms can be seen in the image attached below. From the image below, we can deduce the following:

On the periodic table, the Bromine (Br) atom is the fourth member in the halogen family group. The atomic size increases from top to bottom down the group, thus Br atom posses a larger atomic size than Cl atom. As a result of that, the bond length formation between the two Br atoms will be larger compared to that of the two Cl atoms.

During 1700s, Lavoisier demonstrated through trial and error method that the total mass of reactant and mass of product remains same during the experiment.

In the last part of the 1700s, Lavoisier demonstrated through trial and error that the total mass doesn't change in a chemical reaction, driving him to proclaim that matter is constantly preserved in a compound response.Lavoisier's experiment denoted whenever somebody first obviously tried this thought of the conservation of issue by estimating the majority of materials both when they went through a compound response.

At last, the disclosure of the law of conservation of mass was enormously influential for the field of science since it demonstrated that matter wasn't just vanishing (as it had all the earmarks of being) yet was somewhat changing structure into one more substance of equivalent mass.

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Answer:

renewable resources are abundant???

Answer:

renewable resources are abundant!

Explanation:

Answer:

In the image below

Explanation:

Hope this helps you :)

Considering the Dalton's partial pressure, the the total pressure of the Heliox mixture is 1.1 atm.

Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:

\(P_{T}\)= P₁ +P₂ + ... + Pₙ

where n is the amount of gases present in the mixture.

This relationship is due to the assumption that there are no attractive forces between the gases.

In this case, the total pressure of the Heliox mixture is calculated as:

\(P_{T} =P_{He} +P_{O_{2} }\)

Being:

the total pressure of the Heliox mixture is

\(P_{T}\)= 0.75 atm + 0.35 atm

\(P_{T}\)= 1.1 atm

Finally, the total pressure is 1.1 atm.

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Answer: Waves are most commonly caused by wind. Wind-driven waves, or surface waves, are created by the friction between wind and surface water. As wind blows across the surface of the ocean or a lake, the continual disturbance creates a wave crest. The gravitational pull of the sun and moon on the earth also causes waves.

High and low tides are caused by the Moon. The Moon's gravitational pull generates something called the tidal force. The tidal force causes Earth—and its water—to bulge out on the side closest to the Moon and the side farthest from the Moon. These bulges of water are high tides.

If the tides is wrong then put “Gravity is one major force that creates tides. In 1687, Sir Isaac Newton explained that ocean tides result from the gravitational attraction of the sun and moon on the oceans of the earth (Sumich, J.L., 1996). ... Tidal forces are based on the gravitational attractive force”. :)))

The following chemical equation 2C8H18(g)+ 25O2(g)→ 16CO2(g)+ 18H2O(g) is balance and 48.64 grams of oxygen is required in the combustion of octane in gasoline.

When burning of petrol happens and releases toxic hydrocarbons and carbon dioxide gasses with some amount of oxygen is known as combustion.

The balanced chemical equation is 2C8H18(g)+ 25O2(g)→ 16CO2(g)+ 18H2O(g),

                      number of moles = mass / molar mass

substituting the value in equation,

                      number of moles = 14 / 114g = 0.122 moles.

number of moles of oxygen 0.122 × 0.122 moles. = 1.52 moles.

                    1.52 = mass / 32

                      mass = 48.64 gram.

Therefore,48.64 grams of oxygen is required in the combustion of octane in gasoline.

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The balanced chemical equation would be as follows,

C8H18(g)+12.5 O2(g)→ 8 CO2(g)+ 9 H2O(g)

105.26  grams of oxygen are required to react with 14.0 grams of octane ( C8H18 ) in the combustion of octane in gasoline.

A chemical reaction is a process in which one or more substances, also known as reactants are converted to one or more different substances, known as products. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products

The balanced chemical equation would be as follows,\

C8H18(g)+12.5 O2(g)→ 8 CO2(g)+ 9 H2O(g)

114 grams of octane ( C8H18 ) require 400 grams of oxygen

1 gram of octane requires 400/114 grams of oxygen

30 grams of octane require 400/114×30 grams of oxygen

30 grams of octane require 105.26  grams of oxygen

Thus,105.26  grams of oxygen are required to react with 14.0 grams of octane ( C8H18 ) in the combustion of octane in gasoline.

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Answer:

Element

Explanation:

All matter is made up of very small particles called atoms. Atoms are the building blocks of all matter. When a substance contains only one type of atom, it is called an element.

The mass of 8.83x10^23 formula units of iron oxide can be calculated using the molar mass of iron oxide.

The molar mass of iron oxide is 159.69 g/mol.

Therefore, the mass of 8.83x10^23 formula units of iron oxide can be calculated by multiplying the molar mass by the number of formula units: Mass = 8.83x10^23  formula units x 159.69 g/mol Mass = 1.41x10^26 g

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The pillar of sustainability broken by recycling electronics in India is environmental sustainability. Implementing a law that restricts electronics recycling to the US would not necessarily be the most effective solution, as it overlooks the complex global dynamics of electronic waste management.

Recycling electronics in India often involves improper disposal methods, such as burning or dismantling without proper safety measures. This leads to environmental pollution, including the release of hazardous substances into the air, soil, and water, thus violating the principle of environmental sustainability.

However, simply mandating that electronics can only be recycled in the US may not be the most optimal solution. Electronic waste is a global issue, and restricting recycling to a single country disregards the fact that electronic products are manufactured and consumed worldwide. A more comprehensive approach to addressing electronic waste would involve international cooperation, strict regulations, and monitoring of recycling practices to ensure they meet environmental standards.

Efforts should focus on improving recycling practices globally, including promoting responsible electronic waste management, developing sustainable recycling infrastructure in multiple countries, and encouraging the adoption of safe and environmentally friendly recycling practices. This approach would foster global sustainability and address the challenges associated with electronic waste disposal more effectively than a geographically limited restriction.

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Best describes a mole is it contains 6.02×10²³ particles of a given substance

Mole is the amount of substance that contain the same number of elementary entities and according to the Avogadro's law number of elementary entities in the substance is 6.02×10²³ and these elementary entities could be atoms, ions, molecules etc and we use the mole to express the amount of substances and one mole of any substance is the equal to its atomic mass and molecular mass which is expressed in gram and the number of particles present in one mole of any substance is 6.02×10²³

Therefore the statement which is correct for mole is  it contains 6.02×10²³ particles of a given substance

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Three atoms are attached to the central atom in NF3.

In a molecule or ion, the core atom is always thought to have the lowest electronegativity. By contrasting the relative electro negativities of the atoms in the molecule or ion, we may determine which atom should be the central atom.

When we look at NF3, it is clear that nitrogen is the core atom because it has a lower electronegative charge than fluorine. The molecular model also shows that the centre atom had three fluorine atoms linked to it. Consequently, the core atom of the molecule NF3 has three atoms connected to it.

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Answer:

thermal shock

Explanation:

the temperatures inside the glass jar should have continued to increase over time. Internal stresses due to uneven heating. This is also known as “thermal shock”.

In general, the thicker the glass, the more prone it will be to breaking due to the immediate differences in temperature across the thickness of glass.

Borosilicate glass is more tolerant of this, as it has a higher elasticity than standard silicon glass.

You may also note that laboratory test tubes and flasks are made with thinner walls, and of borosilicate glass, when designated for heating.

Answer:

e

Explanation:

Answer:

10°C

Explanation:

Here the problem deals with the relationship between the amount of heat lost and the temperature change of a body.

From the relationship below:

        H  = m C Δt

H is the quantity of heat

m is the mass

C is the specific heat

Δt is the change in heat

  We can see that the quantity of heat is directly proportional to the Δt, so as more heat changes occur, so also is the value of Δt .

Answer:a

Explanation:

hghbh

Answer:

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Adding Cs2SO3, which will quickly dissolve in the solution, would increase the buffer capacity of the 1.00L aqueous solution containing Na2SO3.

Buffer capacity is a measure of the ability of a solution to resist changes in pH when an acid or base is added. It depends on the concentrations of the buffering components in the solution. In this case, the solution contains Na2SO3, which acts as a buffer.

By adding Cs2SO3, which will quickly dissolve in the solution, we are increasing the concentration of the buffering component (SO3^2-) in the solution. This increase in the concentration of the buffering component leads to an increase in the buffer capacity of the solution.

Diluting the solution with water would decrease the concentration of the buffering component, resulting in a decrease in buffer capacity. Adding KHSO3 would introduce a different buffering component, but it may or may not increase the buffer capacity depending on the specific concentrations and properties of the components. Adding excess NaOH would neutralize any H2SO3 present and disrupt the buffering system, leading to a decrease in buffer capacity.

To increase the buffer capacity of the 1.00L aqueous solution containing Na2SO3, the recommended action is to add Cs2SO3, which will quickly dissolve in the solution. This increases the concentration of the buffering component and enhances the solution's ability to resist changes in pH.

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Boyle's law, also known as Mariotte's law, is a relationship describing how a gas will compress and expand at a constant temperature.

Thus, The pressure (p) of a given quantity of gas changes inversely with its volume (v) at constant temperature, according to this empirical connection, which was established by the physicist Robert Boyle in 1662.

In equation form, this means that pv = k, a constant. The French physicist Edme Mariotte also found the connection.

With the assumption of an ideal (perfect) gas, the law can be derived from the kinetic theory of gases. At sufficiently low pressures, real gases follow Boyle's law, albeit at higher pressures, when the gas starts to deviate from ideal behaviour, the product pv typically drops off slightly.

Thus, Boyle's law, also known as Mariotte's law, is a relationship describing how a gas will compress and expand at a constant temperature.

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The property of matter that is conserved in chemical reactions and shown by balanced equations is known as the Law of Conservation of Mass. According to this law, mass can neither be created nor destroyed in a chemical reaction; it can only be transformed from one form to another.For instance, when two substances are combined, they react and form a new substance.

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