Quan is an artist who makes jewelry using a technique call hammering. Hammering is when a person uses a mallet or a special hammer and repeatedly hits the material to make patterns or to shape the material. In which area of the periodic table should Quan look to find materials that would be suitable for making this jewelry? O A. Among the nonmetals O B. Among the metalloids O C. Among the metals O D. Among the noble gases​

The presence of hydrogen and hydroxyl ions determines the acidic and basic nature of a solution.

The use of the pH scale is one way of determining the acidic and basic nature of solution. If the pH of a solution is less than 7, it is considered as acidic and if the pH is 7, the solution is neutral.

While if the pH is greater than 7,the solution is basic so we can conclude that the presence of hydrogen and hydroxyl ions determines the acidic and basic nature of a solution.

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At pOH value  of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

In this question we will apply the formula

      pH +pOH = 14 . . . . . . . . . . . . .(1)

where pH = concentration of [\(H^{+}\) ] ion

pOH = concentration of [\(OH^{-}\) ] ion

As per the question

pOH =6.0

Putting the value of pOH in equation (1) we get the value of pH

              pH + 6.0 =14

             pH = 14 -6.0

             pH  = 8.0

 The value of pH if the pOH value is 6.0 is 8.0

To find the concentration of \(H^{+}\) ion we will use the following formula

This is calculated by the formula

                                 [\(H^{+}\)} = \(10^{-pH}\)

where we will write the values of pH

Hence the concentration of [\(H^{+}\)} ion is \(10^{-8}\)

Therefore at  pOH of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

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The complete question is -

What is the pH value and concentration of [\(H^{+}\) ] ion of the following if the pOH value of the solution is 6.0 ?

Answer:

0.1734

this is the answer to the question

Answer: Calcium, Magnesium, and Iron

Explanation:

The reactivity series is a list of metals arranged in the order of their decreasing activities. Sodium is the second metal of activity series so it can displace calcium, magnesium and iron because all of them come after sodium in activity series.

Hope this helps

Answer:D

Explanation:

Decomposers decompose food and return it to the environment through the soil

The value of Kc for the given reaction is 0.0579 (rounded to four decimal places).

The formula for the equilibrium constant, Kc, of a reaction is given by the ratio of the product of the concentrations of the products raised to their respective stoichiometric coefficients to the product of the concentrations of the reactants raised to their respective stoichiometric coefficients.

The stoichiometric coefficients are the coefficients in the balanced chemical equation.

To determine the value of Kc for the reaction given by the following chemical equation:N2(g) + 3 H2(g) ⇌ 2 NH3(g)

we first need to write the expression for Kc.

The expression for Kc is given by the following formula:Kc = [NH3]² / [N2][H2]³.

We are given the equilibrium concentrations as follows:[N2]eq = 2.66 M[H2]eq = 0.64 M[NH3]eq = 3.34 M

We can substitute these values into the expression for Kc and obtain the following:Kc = (3.34)² / (2.66)(0.64)³ = 0.0579 (rounded to four decimal places).

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HAZWOPER training and certification recognize:

The correct option is both A and C

HAZWOPER (Hazardous Waste Operations and Emergency Response) training and certification recognize that a large number of victims (as much as 80%) in hazardous waste incidents or emergencies will self-present or be self-referred for medical treatment.

Additionally, HAZWOPER training acknowledges that victims may use any entrance they can access at a hospital, not just the emergency department entrance.

This is because individuals affected by hazardous materials may arrive at different areas of the hospital seeking medical assistance.

Therefore, option d. Both A and C are correct statements regarding the recognition of HAZWOPER training and certification.

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Explanation:

To calculate the heat gained by nickel, we can use the formula:

q = m * c * ΔT

where q is the heat gained, m is the mass of the nickel, c is the specific heat of nickel, and ΔT is the change in temperature.

Given:

- Mass of nickel, m = 31.4 g

- Specific heat of nickel, c = 0.443 J/g · °C

- Change in temperature, ΔT = 64.2 °C - 27.2 °C = 37.0 °C

Substituting the values into the formula, we get:

q = (31.4 g) * (0.443 J/g · °C) * (37.0 °C)

Simplifying the calculation, we get:

q = 584 J

Therefore, the heat gained by nickel when 31.4 g of nickel is warmed from 27.2 °C to 64.2 °C is 584 J.

The islands with the most successful migration were the blue island and the yellow island with mean values ​​of 4.6 and 4.4. A successful rate of immigration affects the island's biodiversity by introducing new species into the environment, which increases the diversity of organisms living on the island.

Migration of generalist species to a green island would affect specialized species living on the island by competing for resources, as generalist species are better adapted to different environments.

Based on the data, the blue and yellow islands would be the best choice for wildlife refuges because they had the highest mean values ​​and would be more likely to have higher immigration success.

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Answer:

D

Explanation:

The ratio of C6H12O6 (which will be referred to as "the carb") to oxygen is 1 to 6, so if we find an answer which has the same ratio, it should be chosen. A is 1:3
B is even worse with a ratio of the carb to oxygen of 1:2
C is the same as B, 1:2
D has a ratio of the carb to oxygen of 1:6, which is what we are looking for.

Answer:

Power, P = 300 W

Explanation:

We have,

Force acting on the box to take it is 300 N

It is moved to a distance of 10 m in 10 seconds

It is required to find the power required to move the box. The rate at which work is done is called power required by an object. It can be given by the formula as follows :

\(P=\dfrac{W}{t}\\\\P=\dfrac{Fd}{t}\\\\P=\dfrac{300\times 10}{10}\\\\P=300\ W\)

So, the power required is 300 W.

Answer:

Explanation:

From the given information:

mass = 3.42 kg = 3420 g

molar mass of \(C_3H_7NH_2\) = 59 g

Number of moles of  \(C_3H_7NH_2 = \dfrac{mass (in gram) }{molar mass}\)

Number of moles of \(C_3H_7NH_2 = \dfrac{3420 \ g }{59 \ g}\)

= 57.966

number of hydrogen atoms present = \(n \times N_A\)

where;

\(N_A = avogadro's \ constant = 6.022 \times 10^{23}\)

number of hydrogen atoms present \(=9 \times 57.966 \imes 6.022 \times 10^{23}\)

\(\mathbf{= 3.14 \times 10^{26}}\)

To solve this problem, we need to consider the energy required to warm the ice cube from -18.5°C to 0°C, the energy required to melt the ice cube, and the energy required to warm the melted water from 0°C to 55°C. Let's calculate the energy for each step and determine the number of ice cubes needed.

Warming the ice cube to 0°C:

The specific heat capacity of ice is 2.05 J/g°C. The temperature change is from -18.5°C to 0°C. Therefore, the energy required to warm the ice cube can be calculated as:

Energy = mass × specific heat capacity × temperature change

Energy = 24 g × 2.05 J/g°C × (0°C - (-18.5°C))

Energy = 24 g × 2.05 J/g°C × 18.5°C = 899.4 J

Melting the ice cube:

The heat of fusion (specific latent heat of fusion) of water is 334 J/g. We need to determine the energy required to melt the ice cube. The mass of the ice cube is 24 g, so the energy required can be calculated as:

Energy = mass × heat of fusion

Energy = 24 g × 334 J/g = 8016 J

Warming the melted water from 0°C to 55°C:

The specific heat capacity of water is 4.184 J/g°C. We need to determine the energy required to warm the melted water from 0°C to 55°C. The mass of the melted water can be calculated by subtracting the mass of the ice cube that melted from the initial mass of the ice cube (24 g).

Mass of melted water = 24 g - 24 g = 0 g (since all the ice melted)

Therefore, no additional energy is required for this step.

Now, let's add up the energy required for each step to determine the total energy needed to cool the coffee from 85°C to 55°C:

Total energy required = Energy to warm the ice cube to 0°C + Energy to melt the ice cube

Total energy required = 899.4 J + 8016 J = 8915.4 J

Given that each ice cube provides 8915.4 J of energy, we can determine the number of ice cubes needed to cool the coffee.

Energy per ice cube = 8915.4 J

Energy required to cool the coffee = Total energy required = 8915.4 J

The number of ice cubes needed = Energy required to cool the coffee / Energy per ice cube

Number of ice cubes needed = 8915.4 J / 8915.4 J = 1

Therefore, you would need to add 1 ice cube to your 355 mL cup of coffee to bring it to 55°C.

The correct answer is A. 1.

77.8 grams of copper (I) nitrate are required to produce 44. 0 grams of aluminum nitrate. This can be calculated using the concept of balanced chemical reaction.

Balanced chemical reaction is defined as the reaction which have the same number and type of each atom on both sides of the equation. The coefficients in a balanced reaction must be the simplest whole number ratio. Mass is always conserved in a chemical reactions.

The balanced chemical reaction for copper (I) nitrate and aluminum nitrate is,

6CuNO3 + Al2(SO4)3 → 3Cu2SO4 + 2Al(NO3)3

It is symbolic representation of a chemical reaction in the form of symbols and chemical formulas. In this reaction, the number of each type of atom is equal on the two sides of the equation. It follows the Law of Conservation of Mass which states in a chemical reaction mass can neither be created nor be destroyed. In this, total mass of the products is equal to the total mass of reactants.

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Answer:

Mechanical Energy- Energy that result from movement or the location of the object. Is the sum of kinetic and potential energy.

Thermal Energy- Thermal energy or heat energy reflects the temperature difference between two systems.

Nuclear Energy-  is energy resulting from changes in the atomic nuclei or from nuclear reactions.

Chemical Energy- results from chemical reactions between atoms or molecules.

More:

Kinetic energy- is the energy of motion of a body. It ranges from 0 to a positive value.

Electromagnetic energy- (or radiant energy) is energy from light or electromagnetic waves.

Sonic energy-  is the energy of sound waves. Sound waves travel through the air or another medium.

Gravitational energy- energy associated with gravity involves the attraction between two objects based on their mass.

Ionization energy- is the form of energy that binds electrons to the nucleus of its atom, ion, or molecule.

Potential energy- is the energy of an object's position.

Explanation:

Hope this helps

Answer:

44.8g

Explanation:

The reaction equation is given as:

        4Fe + 3O₂  →  2Fe₂O₃

Given:

Mass of O₂   = 19.2g

Unknown:

Amount of iron used  =?

Solution:

To solve this problem, we adopt the mole concept.

   Since we know the mass of O₂;

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

 Molar mass of  O₂ = 2(16)  = 32g/mol

           Number of moles = \(\frac{19.2}{32}\)   = 0.6moles

From the balanced reaction equation;

           4 moles of Fe will react with 3 moles of O₂

          0.6moles of O₂ will react with \(\frac{0.6 x 4}{3}\)   = 0.8mole of Fe

Mass of Fe  = number of moles x molar mass

                    = 0.8 x 56

                     = 44.8g

Tend to gain electrons in chemical reactions(Option E)

.Metals tend to gain electrons and become cations in chemical reactions

.Just as metals lose electrons in chemical reactions and become stable

.The ability to gain electrons is exhibited by non-metals

Metals are materials that, when freshly worked, polished, or crushed, have a lustrous appearance and are relatively good conductors of electricity and heat. Metals are typically ductile and malleable. These properties are the result of metallic bonding between the atoms or molecules of the metal.

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Answer:

They are called coefficients.

Answer:

The displacement by \(CH_{3}CO_{2}^{-}\) on bromoethane.

Explanation:

Given that,

The displacement by \(CH_{3}CO_{2}^{-}\) on bromoethane or bromocyclohexane.

We know that,

Bromoethane is not stable. It can easily break. But bromocyclohexane is more stable obstruct and very strong to displace.

Bromocyclohexane is a ring and we can not break easily of a ring.

So, bromocyclohexane does not displace by \(CH_{3}CO_{2}^{-}\).

Hence, The displacement by \(CH_{3}CO_{2}^{-}\) on bromoethane.

Answer:

The time required to decompose the substance is 360 seconds.

Answer:

C. sterling hope it helps

Answer:

correct will be from back to the start:

grass-grasshopper-toad-snake-hawk

Explanation

ood chain begin with plant-life and end with animal-life.

Answer:

you will add then subtract to get the answer

Answer:

The answer is D. The energy possessed by an electron at a set distance from the nucleus.

Explanation:

Energy levels (also called electron shells) are fixed distances from the nucleus of an atom where electrons may be found. Electrons are tiny, negatively charged particles in an atom that move around the positive nucleus at the center.

Energy levels are the fixed amount of energy that a system described by quantum mechanics, such as a molecule, atom, electron, or nucleus, can have.

An energy level is the energy possessed by an electron at a set distance from the nucleus. Therefore, option D is correct.

Any discrete value from a set of total energy values for a subatomic particle constrained by a force to a finite space or for a system of such particles, such as an atom or a nucleus, is referred to as the energy level, also known as the energy state, in physics.

Since an electron's rotation in a shell is linked to a specific amount of energy. When it moves from one energy level to another, or when it jumps to another shell, the energy changes. As a result, a shell also indicates an electron's energy along with its location, and these are known as energy levels.

The shell or orbital that an electron is in with respect to the atom's nucleus is referred to as its primary energy level.

Thus, option D is correct.

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Answer:

A

Explanation:

A
from le chatelier's principle, we know that as the concentration of one reactant or product changes, the equilibrium is shifted. If the concentration of a gaseous or aqueous product increases, the equilibrium is shifted to the left. Iodine is added, which means that the equilibrium is shifted to the left. Iodine increases, and HI increases. Since HI has increased, there must have been some iodine and hydrogen consumed. Since iodine was added, there is a net increase of iodine. However, since hydrogen was consumed and no new hydrogen was added, the concentration of hydrogen decreases

Answer: Submarine

Explanation:

Depends on the size and weight of the sailboat and submarine but the submarine will have more momentum because it is heavier.