Which of the following elements has three (3) valence electrons?

Mg

K

Al

N

your answer is C. To confine a fission reaction

i just took the test

Answer:

A

Explanation:

This chemical reaction contains the elements carbon and oxygen.

The chemical symbol for the element carbon is C. The symbol for oxygen is O. Carbon dioxide (CO2) is a compound, not an element.

The given reaction C + O2 → CO2 contains the chemical elements carbon and oxygen. The reactant C represents carbon, while O2 represents oxygen as a diatomic molecule. The product CO2 represents carbon dioxide, which is composed of one carbon atom and two oxygen atoms.

In the given reaction C + O2 → CO2, the chemical elements involved are carbon and oxygen. The reactant C represents carbon, while O2 represents oxygen as a diatomic molecule. The product CO2 represents carbon dioxide, which is composed of one carbon atom and two oxygen atoms.

Answer:

Explanation: Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously.

Oxidation reaction is defined as the reaction in which a substance looses its electrons. Reduction reaction is defined as the reaction in which a substance gains electrons.

For the given options:

Option A: [tex]SO_2(g)+H_2O(l)\rightarrow H_2SO_3(aq)[/tex]

This is a combination reaction because two compounds are reacting to form a single compound.

Option B: [tex]CaCO_3(s)\rightarrow CaO+CO_2[/tex]

The above reaction is decomposition reaction because a single compound is breaking down into two compounds.

Option C: [tex]Ca(OH)_2(s)+H_2CO_3(l)\rightarrow CaCO_3(aq)+2H_2O(l)[/tex]

The above reaction is a neutralization reaction because an acid reacts with base to produce salt and water.

Option D: [tex]C_6H_{12}O_6(s)+6O_2(g)\rightarrow CO_2(g)+2H_2O(l)[/tex]

The oxidation state of oxygen changes from 0 to -2, it is gaining electrons. Thus, it is getting reduced and it undergoes reduction reaction. The carbon is getting oxidized and thus it undergoes oxidation reaction.

Thus, it is considered as redox reaction.

Hence, the correct answer is Option D.

Hey there! The answer you're looking for is Helium

Here shows the list of per shell

Hydrogen

Lithium

Beryllium

Theansweris Helium

This is unnecessary

Answer is: D. Neon is the most stable element because its highest occupied energy level is filled.

Neon (symbol: Ne) is an element (noble gas) with atomic number 10, which means it has 10 protons and 10 electrons.

Electron configuration of neon atom: ₁₀Ne 1s²2s²2p⁶.

Noble gases are in group 18: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe) and radon (Rn). They have very low chemical reactivity.

Answer:

chromium (Cr)

Explanation:

Final answer:

Chromium (Cr) is the transition metal among the listed elements. It falls under the first transition series in the d-block of groups 3-12 on the periodic table.

Explanation:

Among the listed elements, chromium (Cr) is a transition metal. Transition metals fall within groups 3-12 on the periodic table and include the d-block elements, which are typically divided into four transition series. Chromium is part of the first transition series.

Other elements listed such as francium (Fr), beryllium (Be), gallium (Ga), and bismuth (Bi) are not considered transition metals. Francium is an alkali metal, beryllium is an alkaline earth metal, gallium is a post-transition metal, and bismuth is considered a metalloid or post-transition metal, but not a transition metal.

Representative elements are also known as Group A elements and cover a wide range of properties in the periodic table. They do not include the transition elements, which are referred to as Group B elements.

The representative elements in the periodic table are also known as the Group A elements. These elements include Groups 1A through 8A, excluding the transition metals, which are the Group B elements. The representative elements are so named because they exhibit a wide range of physical and chemical properties, representing almost all possibilities. In contrast, Group B elements or the transition elements, have their own unique properties different from representative elements.

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Answer:

Plate tectonics refers to the plate tectonic theory. According to this theory, the earth's lithosphere is divided into many parts which are commonly known as plates. These are of two types, the continental and the oceanic crust (plate). These plates move over the less dense layer of the asthenosphere from one place to another due to the creation of convection current in the layer of the mantle. This type of current forms because of the heat energy provided from the extreme internal part of the earth. This theory was simple and universally accepted and replaced the theory of continental drift discovered by Alfred Wegener.

Answer:

C/boiling point

Explanation:

Fractional distillation is a process that is often employed to separate various liquids from a mixture of liquids based on the respective boiling points. As the liquid mixture is heated, the component with the lowest boiling point will vaporize first and can be separated out through a condenser.

Crude oil is a mixture of several volatile hydrocarbons each having a different boiling point. Therefore, the difference in boiling point can be used to separate them through the method of fractional distillation

The components of crude oil are separated by their boiling points during the process of large-scale fractional distillation, where each substance condenses at different levels of the fractionating column.

The components of crude oil can be separated in a refinery using a process called large-scale fractional distillation. The property that allows this separation is the different boiling points of the substances contained in crude oil. When the crude oil is heated in a fractionating column, its components vaporize at different temperatures due to their various boiling points. The vapor rises through the column until it reaches a level where the temperature is low enough for it to condense back into a liquid. The components with higher boiling points condense near the bottom of the column, where the temperature is higher, while those with lower boiling points condense higher up where the temperature is cooler.

This process results in the collection of simpler mixtures of hydrocarbons and other petroleum compounds at different levels of the column. These collected liquids are then used for various applications, such as diesel fuel, kerosene, and gasoline. Boiling point differences are essential for this separation technique, making it the correct answer (C) to the question. Density, magnetism, and physical state do not serve as the primary basis for separation in this context.

Answer:

When determining the types of chemical reactions.

Explanation:

Hello,

In this case, in order to establish the different types of chemical reactions, several experiments are carried out the determine whether a chemical reaction is synthesis, decomposition, double displacement, double displacement or combustion. Such experiments consist on the combination of different of reactants under varied conditions in order the appreciate the reaction behavior over the time, changes in color, temperature changes and formed products that suggest the type of reaction.

Once the observations are set throughout the experiments, one provides the scientific knowledge that in this case will help to differentiate such types of chemical reactions.

Best regards.

I am unsure if this is correct (especially since I'm very late), but here are the possible answer choices to this question:

O a pure substance

O a type of a mixture

O a pure compound

O an impure substance

The answer to this is a pure substance (1st option).

Electromagnetic waves can travel through a vacuum and do not require a medium. They include light, radio waves, and X-rays, among others.

The category of waves that cannot be seen and do not require a medium to travel through is known as electromagnetic waves. Unlike mechanical waves such as sound waves and water waves which need a medium (solid, liquid, or gas) to propagate, electromagnetic waves can travel through a vacuum. These consist of oscillations in electric and magnetic fields and include gamma rays, X-rays, ultraviolet waves, visible light, infrared waves, microwaves, and radio waves. A quintessential example of electromagnetic wave travel is visible light from distant stars reaching Earth through the vacuum of space.

Electromagnetic waves, including varieties like gamma rays and radio waves, do not require a medium to travel and can propagate through a vacuum at the speed of light.

The waves that cannot be seen and do not require a medium to travel through are known as electromagnetic waves. Unlike mechanical waves like sound and water waves, which require a medium such as air, water, or solids to travel through, electromagnetic waves can propagate through the vacuum of space. Some examples of electromagnetic waves include gamma rays, X-rays, ultraviolet waves, visible light, infrared waves, microwaves, and radio waves.

Electromagnetic waves are generated by the oscillations of electric and magnetic fields and they can move through a vacuum as they do not depend on a medium for their propagation. This characteristic allows electromagnetic waves to travel at a constant speed, known as the speed of light, which is approximately 2.99792458 × 108 m/s. Therefore, these waves are fundamentally different from mechanical waves, and this understanding is important for the study of physics and various applications in technology.

Barium: 2 electrons, Sodium: 1 electron, Aluminum: 3 electrons, Oxygen: 6 electrons

The number of electrons in the highest occupied energy level can be determined by looking at the electron configuration of each element. For barium (Ba), the electron configuration is 2-8-18-18-8-2, so there are 2 electrons in the highest occupied energy level. Sodium (Na) has an electron configuration of 2-8-1, so there is 1 electron in the highest occupied energy level. Aluminum (Al) has an electron configuration of 2-8-3, so there are 3 electrons in the highest occupied energy level. Oxygen (O) has an electron configuration of 2-6, so there are 6 electrons in the highest occupied energy level.

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Answer: Option (C) is the correct answer.

Explanation:

In a chemical reaction equation, the number of species or molecules written on the left hand side denote reactants whereas the species or molecules written on the right hand side denote products.

For example, in the given equation, [tex]SO_{2} \rightarrow S + O_{2}[/tex]. Left hand side molecule is [tex]SO_{2}[/tex] and it is the reactant. Whereas the molecules or species on right hand side are S and [tex]O_{2}[/tex] and these are the products.

Thus, we can conclude that the product(s) in this equation would be S + O2.

Answer:

1) Variables

2) Density of the solution: mass in grams / volume in mililiters

3) Mass of NaCl: m₁

    Number of moles = mass in grams / molar mass

    ⇒ mass in grams = number of moles × molar mass

        m₁ = n₁ × MM₁

4) Number of moles of NaCl: n₁

   Molarity = number of moles / Volume of solution in liters

   M = n₁ / Vt

   ⇒ n₁ = M × Vt

5) Substitue in the equation of m₁:

   m₁ = M × Vt × MM₁

6) Substitute in the equation of density:

    d = [M × Vt × MM₁ + m₂] / (1000Vt)

7) Simplify and solve for M

Making the simplistic assumption that the dissolved NaCl(s) does not affect the volume of the solvent water means 1000Vt = V₂  

        m₂/ V₂ is the density of water: 1.00 g/mL

8) Substituting MM₁ = 58.5 g/mol

Comparing with the equation Molarity = m×density + b, you obtain:

The value of m is [tex]\boxed{{\text{1/molar mass}}\left({0.0170\;{\text{mol}}\cdot{{\text{g}}^{-1}}}\right)}[/tex] and the value of b is [tex]\boxed{{\text{mol/volume}}}[/tex].

Further Explanation:

The property is a unique feature of the substance that differentiates it from the other substances. It is classified into two types:

1. Intensive properties:

These are the properties that depend on the nature of the substance. These don't depend on the size of the system. Their values remain unaltered even if the system is further divided into a number of subsystems. Temperature, refractive index, molarity, concentration, pressure, and density are some of the examples of intensive properties.

2. Extensive properties:

These are the properties that depend on the amount of the substance. These are additive in nature when a single system is divided into many subsystems. Mass, enthalpy, volume, energy, size, weight, and length are some of the examples of extensive properties.

Density is defined as the ratio between mass and volume. Both mass and volume are the physical properties that are extensive in nature and their ratio comes out to be an intensive quantity that depends only on the nature of the substance, not on the amount of the substance. The formula to calculate the density of a substance is,

[tex]{\text{Density of substance}}\left({{\rho }}\right){\text{=}}\frac{{{\text{Mass of substance}}\left({\text{M}}\right)}}{{{\text{Volume of substance}}\left({\text{V}}\right)}}[/tex]

Molarity is a concentration term that is defined as the number of moles of solute dissolved in one litre of the solution. It is denoted by M and its unit is mol/L.

The formula to calculate the molarity of the solution is as follows:

[tex]{\text{Molarity of solution}}=\frac{{{\text{amount}}\;\left({{\text{mol}}}\right)\;{\text{of}}\;{\text{solute}}}}{{\;{\text{volume}}\left({\text{L}}\right)\;{\text{of}}\;{\text{solution}}}}[/tex]

The given expression is,

[tex]{\text{Molarity}}={\text{m}}\left({{\text{density}}}\right)+{\text{b}}[/tex]           …… (1)

Substitute the formula of given quantities in equation (1).

[tex]\frac{{{\text{mol}}}}{{{\text{Volume}}}}={\text{m}}\left({\frac{{{\text{mass}}}}{{{\text{Volume}}}}}\right)+{\text{b}}[/tex]                          …… (2)

Quantities with same units are added, subtracted, multiplied or divided. So two quantities on the right-hand side of equation (2) must have the same units and equation (2) becomes,

[tex]\frac{{{\text{mol}}}}{{{\text{Volume}}}}={\text{m}}\left({\frac{{{\text{mass}}}}{{{\text{Volume}}}}}\right)+{\text{m}}\left({\frac{{{\text{mass}}}}{{{\text{Volume}}}}}\right)[/tex]                                 …… (3)

Solve for units of m,

[tex]{\text{m}}=\frac{{{\text{mol}}}}{{{\text{mass}}}}[/tex]

Or it can be written as,

[tex]{\text{m}}=\frac{{\text{1}}}{{{\text{Molar mass}}}}[/tex]                               …… (4)

Substitute 58.5 g/mol for the molar mass of NaCl in equation (4).

[tex]\begin{aligned}{\text{m}}&=\frac{{{\text{1 mol}}}}{{{\text{58}}{\text{.5 g}}}}\\&=0.0170\;{\text{mol}}\cdot{{\text{g}}^{-1}}\\\end{aligned}[/tex]

The unit of b is equal to that of m(density). So its unit can be calculated as follows:

[tex]\begin{aligned}{\text{b}}&=\left({\frac{{{\text{mol}}}}{{{\text{mass}}}}}\right)\left({\frac{{{\text{mass}}}}{{{\text{Volume}}}}}\right)\\&=\frac{{{\text{mol}}}}{{{\text{Volume}}}}\\\end{aligned}[/tex]

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Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Keys to studying chemistry

Keywords: Property, intensive, extensive, physical properties, chemical properties, density, substance, amount, quantity, nature, molarity, units, m, b, mol/L, mol/volume, molar mass.

A computer and a concentration probe

Answer:

1 65mL

Explanation:

The best reason to use titration for monitoring the effects of acid rain on drinking water is: to determine the concentration of acid in drinking water. Option A is correct.

Titrations are a well-established quantitative analysis technique that allows scientists to accurately measure the concentration of acids or bases in a solution. This can be particularly useful in environmental chemistry, where it is important to understand the acidity of drinking water due to potential contamination from acid rain.

By applying titration methods, one can detect the exact concentration of acidic species and thus assess their impact on drinking water quality. These methodologies are reliant upon accurately determining the equivalence point, which is often indicated by a change in color for a selected pH indicator, during the titration process.

Hence, A. is the correct option.

The complete question is:

Which of the following would be the best reason to use titration for monitoring the effects of acid rain on drinking water?

A. to determine the concentration of acid in drinking water

B. to find out if the drinking water contains helpful nutrients for the body

C. to find out if there are other poisonous chemicals in the drinking water

D. to determine the molar ratio of acid to base in the drinking water

Final answer:

To obtain 10L of 11% orange juice mix, we need 6L of 15% orange juice and 4L of 5% orange juice. We determine this by setting up and solving a system of linear equations based on the total volume and desired concentration.

Explanation:

To solve the problem of mixing two concentrations of orange juice to obtain 10 liters of a 11% orange juice solution, we will set up a system of equations. Let's define x as the amount of 15% orange juice and y as the amount of 5% orange juice. The total amount of the mixture should be 10 liters, so we have:

x + y = 10 ... (1)

Next, we set up the second equation based on the concentration of orange juice. Since we want the final concentration to be 11%, we can write the following equation:

0.15x + 0.05y = 0.11(10) ... (2)

Now we solve the system of equations. Multiplying equation (2) by 100 to make the numbers easier to work with, we get:

15x + 5y = 110

From equation (1), we can express y as:

y = 10 - x

Substituting y in equation (2), we have:

15x + 5(10 - x) = 110

15x + 50 - 5x = 110

10x = 60

x = 6

Now we find y using equation (1):

y = 10 - x

y = 10 - 6

y = 4

So, we need 6L of the 15% orange juice and 4L of the 5% orange juice to get 10L of 11% orange juice.

Answer: KOH

Explanation:I JUST TOOK IT