which statement about the earth atmosphere is true

A.recent incease in carbon dioxide levels can contribute to a long--term cooling of eath's climate. B.a recent decrease in carbon dioxide levels will incease plant growth on eath.c.in the past few decades,carbon level has been rising.D.in the past few decades,carbon level has been falling

Answer:

1. Foods that have changes that are chemically introduced.

2. corn soybeans apples etc

3. sot they last longer or look better

4. new dna is placed in them and their seeds

5. they are not as good for humans

Explanation:

Answer:

%C₁ = %C₂ = 50%

Explanation:

Set up simultaneous equations to solve for two unknowns,

let f₁ and f₂ = fractional abundances of C₁ and C₂ respectively.

Then f₁ + f₂ = 1.00  and

34.97f₁ + 36.97f₂ = Wt. Avg. Atomic Mass (amu) = (34.97 + 36.97)/2 = 35.97amu

Solve equation 1 for f₂ = 1 - f₁ and substitute into equation 2

=> 34.97f₁ + 36.97(1 - f₁) = 35.97

=> 34.97f₁ + 36.97 - 36.97f₁ = 35.97

=> 2f₁ = 1

=> f₁ = 1/2 = 0.50 => 50% abundance for C₁

=> f₂ = 1 - 0.50 = 0.50 => 50% abundance for C₂

Answer:

Explanation:

given volume =5.3 litres

as we know that 1 litre =1 dm3

therefore 5.3 litres =5.3 dm3

now moles =given mass /molar mass

so mass =moles*molar mass

in order to find mass of carbon we need to find moles

therefore moles=given volume/standard volume  standard volume at STP is 22.4 dm3

moles= 5.3/22.4

moles=0.236=0.24

now mass of carbon dioxide =moles*molar mass

mass = 0.24*44

mass=10.56kg

Answer:

C) Electrons will reside closer to chlorine, and the bond will be polar

Explanation:

Electrons tend to be closer or attracted to high electronegativity and sulfur has less electronegativity than chlorine. Therefore, electrons will reside closer to chlorine. To find out if it is polar or nonpolar, according to the electronegativity chart you can find online, you can see that the electronegativity of sulfur is 2.5 while the electronegativity of chlorine is 3.0. Because the difference between these two is a slight change, it would be slightly polar. So, the bond will be polar.

Answer:

Electrons will reside closer to chlorine, and the bond will be polar.

Explanation:

Answer:

Explanation: Every electron has a single negative(-) charge, the addition of two electrons results in an oxygen ion with a charge of negative(−)2. This is  in fact true of every element located under oxygen in the periodic table.

P.S. hope this helps :)

Answer:

D

Explanation:

Cuz i got it wrong and this was the right answer : )

The best reaction  that would possibly make a good  airbag inflator is the reaction in which CO2 is produced.

An airbag refers to certain objects that are put into vehicles to ensure that the occupants of the vehicle do not bump against objects that are within or outside the vehicle when there is a collision.

Since a good airbag must contain substances that quickly react to produce a non-combustible gas that fills up the airbag in order to cushion the effect of a collision, the best reaction that would possibly make a good  airbag inflator is the reaction in which CO2 is produced.

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In the following redox reaction, the reducing agent is MnO2 (option D). Details about reducing agent can be found below.

A reducing agent in a redox reaction is any substance that reduces, or donates electrons to another, hence, it becomes oxidized.

According to this question, a redox reaction is given as follows: MnO2(s) + 4H+(aq) + 2Cl–(aq) = Mn2+(aq) + 2H2O(l) + Cl2(g)

As shown in the equation, MnO2 is oxidized into Mn2+, therefore, it is the reducing agent.

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We can estimate the probabilities of forming certain elements based on fission product yield distributions while it is not possible to precisely predict the elements that will form from a specific U-235 fission reaction with one neutron.

When a Uranium-235 atom (U-235) absorbs a neutron, it undergoes nuclear fission, which is a process where the nucleus splits into smaller nuclei, releasing energy and additional neutrons. The resulting elements formed from this reaction are called fission products.

Predicting the exact elements that will be formed from a specific fission reaction involving U-235 and one neutron is not straightforward. This is because the fission process is probabilistic, meaning the formation of specific elements is based on probabilities, not certainties.

However, scientists have identified certain fission product yield distributions, which give an idea of the likelihood of forming specific elements from the fission of U-235. These yield distributions are obtained through experimental data and theoretical models.

In summary, while it is not possible to precisely predict the elements that will form from a specific U-235 fission reaction with one neutron, we can estimate the probabilities of forming certain elements based on fission product yield distributions.

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The number of seconds in a 40-hour work week can be  c. 40 h x

You work a regular 40-hour workweek (eight hours a day).

That persisted up until 1926, when Henry Ford let his workers off the hook for one day of obligatory labour. Eight-hour days and six-day weeks totaled 48 hours of labour each week for Ford employees. The 40-hour workweek, as it is currently known, was created by eliminating one day and replacing it with five days of eight-hour shifts.

Four nine-hour days followed by an eight-hour Friday is the most typical pattern for doing this. The next week consists of four nine-hour days and a Friday off.

A full-time employee is one who works an average of at least 30 hours per week for the duration of a calendar month in order to qualify under the employer shared responsibility laws.

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Answer:

J. Their momentum is conserved

Explanation:

According to the diagram, the best statement that describes what happens when two astronauts collides in space is that their momentum is conserved.

The momentum before collision is 320kgkm/hr and after collision it is 320kgm/s

 This collision is an inelastic collision;

    momentum before  = momentum after

              m₁v₁ + m₂v₂     =       v(m₁ + m₂)

m₁ = 80kg

v₁  = 4km/hr

m₂ = 80kg

v₂  = 0

v  = 2km/hr

 Insert the parameters;

              (80 x 4) + (80 x 0)    = 2(80 + 80)

                    320                      = 320

It is important for chemists to study submicroscopic matter because the behavior and properties of matter at the atomic and molecular levels directly influence the macroscopic properties and phenomena observed in the world around us.

Here are some reasons;

Understanding fundamental principles: Submicroscopic matter provides insights into the fundamental principles and laws that govern the behavior of matter. By studying atoms, molecules, and their interactions, chemists can uncover the underlying principles that explain various chemical phenomena.

Predicting and controlling macroscopic properties: The properties of macroscopic matter, such as solubility, reactivity, and physical characteristics, are determined by the arrangement, composition, and interactions of its submicroscopic components. By understanding and manipulating submicroscopic matter, chemists can predict and control macroscopic properties, leading to the development of new materials with specific characteristics or the optimization of existing materials.

Exploring chemical reactions and processes: Chemical reactions occur at the submicroscopic level, involving the rearrangement of atoms and the breaking and forming of chemical bonds. By studying submicroscopic matter, chemists can investigate reaction mechanisms, understand reaction kinetics, and develop strategies to optimize chemical processes for efficiency, selectivity, and sustainability.

Advancing technology and innovation: Many technological advancements and innovations rely on the understanding and manipulation of submicroscopic matter. Fields such as nanotechnology, molecular electronics, and materials science heavily rely on studying and engineering matter at the atomic and molecular scale to develop new technologies, devices, and materials with improved performance and functionality.

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Answer:

3.45 moles Li  contains  2.08 × 10 (to the power of)24  atoms .

Explanation:

The relationship between atoms and moles is:

1  mole atoms =

6.022 × 10 (to the power of)23

atoms

In order to determine how many atoms occupy a given number of moles, multiply the given moles by  

6.022 × 10 (to the power of)23

atoms/mole

.

In the case of 3.45 moles lithium (Li):

3.45 mol Li × 6.022 × 10 (to the power of)23  atoms Li/ 1 mol Li =

2.08 × 10 (to the power of)24

atoms Li  rounded to three

Answer: 3.45 moles Li contains 2.08 × 10 (to the power of)24 atoms

Explanation:

Answer:

A

Explanation:

The picture given in the question is very difficult to understand. Please the picture attached below. It may help you more to understand.

..

A potential energy diagram shows the change in potential energy of a system as reactants are converted into products.

Hydrogen bonding occurs between polar molecules that have a hydrogen atom that is directly bonded to a nitrogen, an oxygen, or a fluorine atom. That creates an extremely polar molecule with a permanent net dipole moment.

A hydrogen bond (or H-bond) is a primarily electrostatic force of attraction between a hydrogen (H) atom which is covalently bound to a more electronegative "donor" atom or group, and another electronegative atom bearing a lone pair of electrons—the hydrogen bond acceptor (Ac). Such an interacting system is generally denoted Dn–H···Ac, where the solid line denotes a polar covalent bond, and the dotted or dashed line indicates the hydrogen bond.The most frequent donor and acceptor atoms are the second-row elements nitrogen (N), oxygen (O), and fluorine (F).

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Answer:

2/3 xX ml of gas

Explanation:

P1V1= P2V2

2 x X= 3 x y

y (new volume)= 2/3 x

0.66 x will be the new volume when the pressure of x mL of gas was increased from 2 ATM to 3 ATM at a constant temperature.

The ideal gas law (PV = nRT) relates to the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

Given:

\(P_1\)= 2 ATM

\(V_1\)= x mL

\(P_2\) =3 ATM

\(V_2\) =?

\(P_1V_1= P_2V_2\)

2 x X= 3 x Y

Y(new volume)= 0.66 x

Hence, 0.66 x will be the new volume when the pressure of x mL of gas was increased from 2 ATM to 3 ATM at a constant temperature.

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The mass of an object with a net force of 356N and an acceleration rate of 4m/s² is 89kg.

The mass of an object can be calculated using the following formula:

F = ma

Where;

m = F/a

m = 356/4

m = 89kg

Therefore, the mass of an object with a net force of 356N and an acceleration rate of 4m/s² is 89kg.

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Answer:

La molalidad y la normalidad son definiciones empleadas en aplicaciones de concentración bastante útiles para lograr proporciones óptimas en soluciones sólido-líquido y líquido-líquido, asimismo permite un criterio cuantitativo para aplicar un control de calidad en insumos productos a cualquier escala, así como garantizar unos mínimos de seguridad en materia de cuidado ecológico y de la salud humana, evitando desastres ecológicos, así como enfermedades y muertes asociadas a intoxicaciones.

Explanation:

La molalidad y la normalidad son definiciones empleadas en aplicaciones de concentración bastante útiles para lograr proporciones óptimas en soluciones sólido-líquido y líquido-líquido, asimismo permite un criterio cuantitativo para aplicar un control de calidad en insumos productos a cualquier escala, así como garantizar unos mínimos de seguridad en materia de cuidado ecológico y de la salud humana, evitando desastres ecológicos, así como enfermedades y muertes asociadas a intoxicaciones.

The balanced chemical equation is:

C + 2F2 → CF4

The correct whole number coefficient for carbon is 1.

What is balanced chemical equation?

A balanced chemical equation is one that uses chemical formulas and symbols to express a chemical reaction and displays the same number of titers of each element on the reactant and product sides of the equation. This calls for the conservation of the total number of titles of each element throughout the reaction as well as the equality of the masses of the reactants and products.

As long as they are utilised to multiply the number of tittles in the formulations and do not alter the identity of the material, parts are added to the formulas of the reactants and/or products to balance a chemical equation.

Therefore, the balanced chemical equation is:

C + 2F2 → CF4

And, the correct whole number coefficient for carbon is 1.

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Answer:

a. a covalent compound is the answer

Answer:

A

Explanation:

Answer:

carbon

Explanation: carbon is the answer

The impulse experienced by a body is equivalent to its change in momentum. Therefore, the valid answer for the given question is option C.

The impulse experienced by an object can be defined as the change in momentum of the object that occurs when an unbalanced force acts on it.In an isolated system of particles, the momentum of the system is conserved regardless of the number of collisions that occur within the system. Hence, the valid answer for this question is option A, true.In an elastic collision, the kinetic energy of the collision before and after the collision will not change.

Therefore, the valid answer for this question is option A, true. In an elastic collision, both the momentum and kinetic energy of the colliding particles are conserved. The total kinetic energy of the colliding particles before the collision will be equal to the total kinetic energy of the colliding particles after the collision.

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Answer: time

Explanation: time

Answer:

The formula for density is D = M/V, where d is density, M is mass, and V is volume. Density is commonly expressed in units of grams per cubic centimetre..

The density equation is density equals mass per unit volume or D = M / V. The key to solving for density is to report the proper mass and volume units. If you are asked to give density in different units from the mass and volume, you will need to convert them..

The five steps for determining density can be expressed in simple form as follows: measure the mass of the container, measure the volume of the liquid, measure the combined mass of the liquid and the container, determine the mass of the liquid alone and divide the mass by the volume..

Explanation:

I hope it helps..

Just correct me if I'm wrong, okay?(;ŏ﹏ŏ)

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Answer:

A control variable

Explanation:

Answer:

Control variable

Explanation:

A system of linear equations to balance the following chemical reaction:

Limestone, CaCO₃, neutralizes the acid, H₃ O, in acid rain is:

2H₃O + CaCO₃ → 3H₂O + Ca + CO₂

To balance the chemical equation:

H₃O + CaCO₃ → H₂O + Ca + CO₂

We need to ensure that the number of atoms of each element is the same on both sides of the equation.

Let's assign variables to the coefficients of each compound:

H₃O: x

CaCO₃: y

H₂O: z

Ca: a

CO₂: b

Now, we can set up the system of equations based on the number of atoms for each element:

For hydrogen (H):

3x = 2z

For oxygen (O):

3x + 3y = 2z

For calcium (Ca):

y = a

For carbon (C):

y = b

For calcium (Ca):

a = 1

Solving this system of equations will give us the balanced coefficients. Let's solve it:

From the equation y = a, we have y = 1.

From the equation y = b, we have b = 1.

Substituting b = 1 into the equation 3x + 3y = 2z, we have:

3x + 3 = 2z

From the equation 3x = 2z, we have x = (2/3)z.

Substituting x = (2/3)z into the equation 3x = 2z, we have:

3(2/3)z = 2z

2z = 2z

This equation is true for any value of z, indicating that z can take any value.

Therefore, we can choose z = 3 to simplify the coefficients:

x = (2/3)z = (2/3)(3) = 2

y = 1

z = 3

a = 1

b = 1

Thus, the balanced equation is:

2H₃O + CaCO₃ → 3H₂O + Ca + CO₂

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Answer:

99898

Explanation:

The subscript for Iridium in the correct formula for Iridium (I) Chromate is 2. In the compound Iridium (I) Chromate, the Iridium ion has a charge of +1. This means that there needs to be two Iridium ions to balance out the charge of the Chromate ion, which has a charge of -2.

In chemical formulas, the subscript is used to indicate the number of atoms or ions of a particular element in a compound. So in this case, the subscript of 2 for Iridium indicates that there are two Iridium ions present in Iridium (I) Chromate.

To further clarify, let's break down the components of Iridium (I) Chromate: "Iridium" refers to the element Iridium, which is represented by the symbol "Ir".  "(I)" indicates that the Iridium ion has a charge of +1.
"Chromate" refers to the polyatomic ion Chromate, which is represented by the formula "CrO4^2-". It has a charge of -2. By combining the Iridium ion and the Chromate ion, we need two Iridium ions to balance out the charge of the Chromate ion, resulting in the formula Ir2(CrO4).

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Answer:

A 4 half-life

B. 0.05 mg

Explanation:

A. Determination of the number of half-lives after 2.8×10⁹ years.

From the question given above,

7×10⁸ years = 1 half life

Therefore

2.8×10⁹ years = 2.8×10⁹ years × 1 half life / 7×10⁸ years

2.8×10⁹ years = 4 half life

Thus, the sample went through 4 half-lives at the end of 2.8×10⁹ years.

B. Determination of the amount of the sample remaining after 2.8×10⁹ years.

Original amount (N₀) = 0.74 mg

half life (t½) = 7×10⁸ years

Time (t) = 2.8×10⁹ years

Amount remaining (N) =?

Next, we shall determine the rate of disintegration. This can be obtained as follow:

half life (t½) = 7×10⁸ years

Decay constant (K) =?

K = 0.693 / t½

K = 0.693 / 7×10⁸

K = 9.9×10¯¹⁰ /year

Finally, we shall determine the amount remaining as follow:

Original amount (N₀) = 0.74 mg

Time (t) = 2.8×10⁹ years

Decay constant (K) = 9.9×10¯¹⁰ /year

Amount remaining (N) =?

Log (N₀/N) = kt / 2.303

Log (0.74/N) = 9.9×10¯¹⁰×2.8×10⁹ /2.303

Log (0.74/N) = 2.772 / 2.303

Log (0.74/N) = 1.2036

Take the antilog of 1.2036

0.74/N = antilog (1.2036)

0.74 / N = 15.98

Cross multiply

0.74 = N × 15.98

Divide both side by 15.98

N = 0.74 / 15.98

N = 0.05 mg

Thus, 0.05 mg of the sample will remain after 2.8×10⁹ years

The amount of uranium sample remained after 4 cycles in \(\rm 2.8\;\times\;10^9\) years has been 0.04625 mg.

The half-life can be described as the time required by the element to reduce to its half concentration from the initial concentration.

A. The number of half-life cycles can be calculated as:

\(\rm 7.0\;\times\;10^8\) = 1 cycle

\(\rm 2.8\;\times\;10^9\) = \(\rm \dfrac{1}{\rm 7.0\;\times\;10^8}\;\times\;2.8\;\times\;10^9\)

= 4 cycles.

The number of half-life cycles after \(\rm 2.8\;\times\;10^9\) years are 4 cycles.

B. The amount of sample remained can be calculated as:

Sample remained = Initial sample \(\rm \times\;\dfrac{1}{2}^\frac{time}{Half-life}\)

Sample remained = 0.74 mg \(\rm \times\;\dfrac{1}{2}^\frac{2.8\;\times\;10^9}{7.0\;\times\;10^8}\)

Smaple remianed = 0.74 \(\rm \times\;\dfrac{1}{2}^4\)

Sample remained = 0.74 \(\times\) 0.0625 mg

Sample remained = 0.04625 mg.

The amount of uranium sample remained after 4 cycles in \(\rm 2.8\;\times\;10^9\) years has been 0.04625 mg.

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