Which of these groups would be MOST concerned with technological developments in insect control?

A.
archaeologists

B.
paleontologists

C.
meteorologists

D.
agriculturists

The amount of mass potassium hydroxide (KOH) required to react with every 1.25 g of aluminum is 2.58 g.

The amount of mass potassium hydroxide (KOH) required can be calculate as follow:

as we know;

Mass of pure aluminum = 1.25g

Molar mass of KOH = 56 g/mol

The chemical reaction of a given element is given by:

[tex]2Al + 2 KOH + 6H_2O = > 2K^{+} +2Al(OH)^{4-} +3 H^{+}[/tex]

From the above reaction, we can deduce that:

2 mol AL ----- 2 mol KOH

How many moles of aluminum are needed for 1.25g?

[tex]n Al =\frac{ g}{mw} \\n Al =\frac{ 1.25}{27}\\nAl = 0.046 moles[/tex]

The mass of KOH required for 0.046 moles of aluminum is calculated as:

Mass Required = 0.046 x 56

Required mass = 2.58 g

Therefore, the amount of mass potassium hydroxide (KOH) required to react with every 1.25 g of aluminum is 2.58 g.

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Answer:

An atom of Sulfur

Explanation:

i did a Quick search and im trying to get pass the "help a person first"

Answer:

• A collection of atoms of Sulfur

Explanation:

I'll assume the notation is written as [tex]S_{8}[/tex].  A subscript after an element symbol represent the number of individual atoms of the symbol.  In this case [tex]S_{8}[/tex] is telling us we have 8 sulfur atoms that are somehow connected to each other.  That is in contrast with 8S, which means we have 8 different sulfur atoms.  A chemical formaula, such as [tex]CH_{4}[/tex] tells us we have a molecule containing 1 carbon atom and 4 hydrogen atoms.

Electrolysis occur when an electric current is passed through a liquid or solution thereby causing the decomposition of chemicals.

For magnesium chloride, it will be heated to be able to conduct electricity. When molten, the MgCl2 will decomposes into Mg2+ and 2Cl- ions. During electrolysis, the elements are separated according to the equations;

According to the half reactions, the Mg2+ is reduced at the cathode (-) and the Cl- is oxidized at the anode (+). Reduction at the cathode shows that magnesium gains two electrons to form a magnesium solid while the chlorine ion looses two electrons at the anode

Answer:

six

Explanation:

This is kinda like      3  * (Fe + 2O + 2H)      which would be SIX hydrogen atoms  ( or 3 hydrogen molecules)

Let,X = First acid solution contains 25% acid

     Y = Second acid solution contains 45% acid

     Z = Third acid solution contains 85% acid

Restriction given ,Z=3Y

So, X = First acid solution contains 25% acid

     Y = Second acid solution contains 45% acid

     3Y = Third acid solution contains 85% acid

Account for concentration of the intended acid solution;

                  = 25X + 45X + (3Y×85)/260 = 35

                  =25[X +12Y]/260 = 35

                  = X+12Y = 364. ————— equation (1)

Account for volume;

                  =X+Y+Z = 260

                  =X+Y + 3Y = 260

                   X+ 4Y = 260 ——————equation (2)

Substrate equation (2) from (1)

We get , Y = 13

Put Y = 13 in equation (2)

We get X = 208

and From X+Y+Z = 260; Z = 65

So ,208 ml of First solution ,13 ml of second solution and 65 ml of third solution should be used.

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The molarity of the solution is 2.33 mol /L

molarity is a physical quantity that describes the substance's number of moles available in the unit liter volume of the solution. A mole per liter is a measurable unit to explain molarity.

Number of moles of the NaCl is

np = 3.50 mol

The volume of the solution is np = 1.50 L

The expression for the molarity solution is cm = np/vp

At the value and get the above expression

Cm = 3.50/ 1.50

      = 2.33 mol /L

Thus the molarity of the solution is 2.33 mol /L

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Answer:

Mixture

Explanation:

Mixture are simply a physical combination of two or more substances. they can be separated based only by physical means, or by undergoing physical changes.

The dual nature of light deals with light as particles and as waves.

The dual nature of light refers to the inherent characteristic of light to behave as waves on one hand and to behave as particles on another hand.

Light behaves as a special kind of wave known as an electromagnetic wave. Light behaves as waves in a different types of phenomena. These include:

Light has a wavelength, frequency, and velocity and has the ability to reflect, refract, interfere, and diffract just like a typical wave.

Light behaves as particles in two phenomena. These are:

Light has energy and moment just like every other particle.\

Due to these 2-face abilities, light is considered both a particle and a wave.

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Answer:

Covalent compounds are always formed between two non-metals.

Explanation:

The answer is FALSE!

Covalent compounds are always formed between two non-metals. The non-metal can not lose electrons they can only gain the electron or they can share the electron to complete its octet.

Hope this helps!

Answer:

The covalent compounds are always formed by 2non-metal elements, so the answer is false

The mass of an object on a triple- beam balance the three weights on the beam 100, 95, and 5 grams. then the density is 2.67 g / cm³.

Density is defined as the evaluation of how closely something is packed. Because it enables us to predict which compounds will float and which will sink in a liquid, density is a crucial notion.
Density can be expressed as

Density = mass / volume

Given

Mass = 100 + 95 + 5 /3

         = 200 / 3

         = 66.7 g

Volume = Initial volume - final volume

             = 50 - 75

             = 25 ml

Density = 66.7 / 25

             = 2.67 g / cm³

Thus, the mass of an object on a triple- beam balance the three weights on the beam 100, 95, and 5 grams. then the density is 2.67 g / cm³.

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Intermolecular force is present for Ne to form a liquid at low temperatures is London dispersion forces.

The hydrogen bond is present between the Hydrogen atom to the N, O, F. The dipole - dipole interaction forces are present in between two polar molecules. ionic bonds exists between two ions, that are positively charged . one is positively charged another one is negatively charged. neon exist as diatomic gas. so, the neon is a non polar .S, neon diatomic atom is present without forming any chemical bond with another atom. so., from the given option in the ques it is clear that the force between the neon atom is present as London dispersion force.

Thus, Intermolecular force is present for Ne to form a liquid at low temperatures isa) London dispersion forces.

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The concentration of a sample of wine that contains 15 mL of ethyl alcohol in 200 mL of wine is 7.5 % v/v.

given that :

volume of solute = 15 mL

volume of solution = 200 mL

percent volume (v/v)% = (volume of solute/ volume of solution) × 100 %

percent volume (v/v)% = (15 mL / 200 mL ) × 100 %

percent volume (v/v)%  = 0.075 × 100 %

percent volume (v/v)%  = 7.5 % v/v.

Thus, The concentration of a sample of wine that contains 15 mL of ethyl alcohol in 200 mL of wine is 7.5 % v/v.

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Hydrogen atom and chlorine atom makes hydrogen chloride molecules.

It is the lowest point in the substance and possesses chemical elements. Atoms don't exist on their own; instead, they combine to create ions and molecules, which combine to create the substances that we can see, feel, and touch.

One or more atoms joined together by covalent (chemical) connections make up molecules. Atoms can be imagined as circles with a central nucleus (consisting of protons and neutrons) and one or more concentric circles surrounding it that represent the "shells" or "levels" in which the electrons surrounding the atom's nucleus are located as well as markings that distinguish the electron. every level

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Number of hybrid and hybridized orbitals of

The combination of two or more atomic orbitals is called a hybrid orbital. Hybrid orbitals overlap to form σ bonds. The regular atomic orbitals are the unhybridized orbitals. Unhybridized orbitals overlap to form π bonds.

Carbon: Carbon is a chemical element. It is denoted by C. Carbon's atomic number is 6.

Nitrogen: Nitrogen is a chemical element. It is denoted by N. Nitrogen's atomic number is 7.  

Therefore, the number of hybrid orbitals and unhybridized orbitals in,

⇒ Carbon atom ( [tex]C_{a}[/tex] ): 2 - hybrid and 2 - unbridized

⇒ Nitrogen atom ( [tex]N_{b}[/tex] ): 4 - hybrid and 0 - unhybridized

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The complete question is

What is the number of hybrid orbitals and unhybridized orbitals, respectively, that are associated with the carbon atom labelled "a" and the nitrogen atom labelled "b"?

The value of Y in the formula when 2.8g of silicon react with 3.2g of oxygen, is 2

The numbers in the formula of a compound determine the ratio of moles of each element in the compound.

Given:

2.8g of silicon

3.2g of oxygen

[relative atomic mass of silicon is 28 and of oxygen is 16]

For silicon, n = 2.8 ÷ 28 = 0.1    (n= moles)

For oxygen, n = 3.2 ÷ 016 = 0.2

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.1 moles.

For Silicon = 0.1/0.1 = 1

For Oxygen = 0.2/0.1 = 2

Taking the mole ratio as their subscripts.

The ratio of Si:O is 1:2

SiO[tex]_{2}[/tex] is the formula of silicon dioxide.

The value of y in the formula SiO[tex]_{Y}[/tex] is 2 when 2.8g of silicon react with 3.2g of oxygen.

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Answer:

Explanation:

Because they have electrical cords  :P    But really,  b/c electron movement is a convenient attribute of many elements.   The electrons are "loose"  on most metals, so they can conduct electricity.  

Answer:

The benefits of power electronics are: High power density power supplies. Improved efficiency of up to 99% in power conversion. Noise-sensitive applications such as in medical devices are also transitioning to switching power supplies because of the efficiency and reliability.

Answer

Volume of O2 = 1326 L

Explanation

Given:

2C8H18(I) + 25 O2 (g) = 16 CO2(g) + 18 H2O (g)

moles of gasoline = 4.00 mol

Pressure = 0.953 atm

Temperature = 35 C = 308 K

Required: volume of oxygen

Solution

Step 1: use stoichiometry to find the moles of oxygen

The molar ratio between gasoline and O2 is 2:25

Therefore the moles of o2 = 4.0 mol x (25/2) = 50.0 mol

Step 2: Calculate the volume using ideal gas law

PV = nRT

V = nRT/P

V = (50.0 x 0,08206 x 308)/0.953

V = 1326 L

A beam of light has a wavelength of 280 nanometers. The frequency of the light is  1.07 × 10¹⁵ Hz.

the information in the question is given as :

wavelength of beam of light = 280 nm

the relation between the frequency and the wavelength is given as :

F = c / λ

where,

F = frequency of the light

c = speed of light

λ = wavelength of light

speed of light , c is = 3 × 10⁸ m/s

substituting all the value in the formula for the frequency, we get:

F = c / λ

F =  3 × 10⁸  / 280 × 10⁻⁹

F = 0.0107 × 10¹⁷ Hz

F = 1.07 × 10¹⁵ Hz

Thus, A beam of light has a wavelength of 280 nanometers. The frequency of the light is  1.07 × 10¹⁵ Hz.

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Yes, Tin and her cousin see the same phase of the moon at the same time.

The Moon is described as the Earth's only natural satellite. The moon is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet, with a diameter about one-quarter that of Earth.

Tin and her cousin see the same phase of the moon at the same time because  because the phase of the Moon does not change as the Earth rotates.

There are eight moon phases and they include:

These eight phases are, in order,

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Answer:

An electrical insulator is a material in which electric current does not flow freely

Explanation:

Answer

A reaction generally can be made to go more quickly by:

B. Adding a catalyst

C. Lowering the activation energy

D. Shaking the reactants

Explanation

The presence of a catalyst increases the rate of a reaction by lowering its activation energy. Chemical reactions occur when molecules collide with each other and undergo a chemical transformation.

Stirring and shaking provide some kinetic energy to the system. It increases slightly its temperature and the reaction rate. increasing the kinetic energy of reactant particles also means more of the reactant particles will have the minimum amount of energy required to form products (ie, activation energy) which leads to more successful collisions and therefore increases the reaction rate.

The purple solid salt that has a mass of 240 grams is the hydrated salt.

Hydrated salts are salts that contain water molecules in their crystals. These water molecules are known as the water of crystallization.

The water of crystallization in salt is the number of moles of water that combines with one mole of a given salt.

Hydrated salts usually weigh more than salts that are not hydrated.

Also, in some salts, a combination with water in their crystals results in the formation of salt that is colored.

Salts that are hydrated can lose some or all of their water of crystallization when they are heated.

Considering the two salts given:

two one-mole samples of a substance in its solid state; The purple solid has a mass of 240 grams, while the blue solid has a mass of 130 grams.

The heavier salt will definitely be the hydrated salt.

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Answer:

Dinitrogen trioxide (triphosphide)

Explanation:

The reaction between Potassium sufide and copper nitrate is as follows:

Cu(NO3)₂ (aq) + K₂S (aq) ---> CuS (s) + 2KNO₃ (aq). It is a precipitation reaction.

In this reaction, copper(II) nitrate is reacting with potassium sulfide to form copper sulfide and potassium nitrate. Copper sulfide is insoluble in water, so it will precipitate out of the solution as a solid.

Cu(NO3)₂ (aq) + K₂S (aq) ---> CuS (s) + 2KNO₃(aq)

This is a precipitation reaction where the products are a solid and two aqueous solutions. The chemical formulas of the reactants are Copper (II) Nitrate and Potassium Sulfide. The products are Copper Sulfide and Potassium Nitrate. The phases of the reactants are aqueous, and the products are solid and aqueous.

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Answer:

1. copper is a pure substance

2. sugar dissolved in solution (sometimes called a homogeneous mixture) is a mixture of sugar and water (the sugar and water don't react with each other)

3. carbon dioxide is a pure substance because there are only CO2 molecules

4. seawater is a mixture of salt, water, and other things

ANSWER

The addition of HCl will shift to reactants

EXPLANATION

When some strong acid is added to a buffer, the equilibrium is shifted to the left, and the hydrogen ion concentration increases by less than expected for the amount of strong acid added. Buffer solution helps in adjusting the pH of a substance.

Since the HCl is a strong acid, it will shift to the left (reactant sides)

Answer:

Answer is C,

Explanation:

It diminished local resources, decreasing the population.

Answer: A reaction in which electrons are transferred between different atoms

Explanation:

A redox reaction example:

oxidation: Zn(s) --> Zn^2+(aq) + 2e-

reduction: Cu^2+(aq) + 2e- --> Cu(s)

redox: Zn(s) + Cu^2+(aq) --> Zn^2+(aq) + Cu(s)

2 electrons are transferred between Zn and Cu.

The concentration of sodium ions in the final solution is 0.94 M.

Concentration is the abundance of a constituent divided by way of the overall volume of an aggregate. several sorts of mathematical descriptions may be outstanding: mass concentration, molar concentration, variety concentration, and extent awareness.

Calculation:-

C₁ = 0.5010

V₁ = 17.5 ml = 0.0175 L

C₂ = 1.1250

V₂ = 46 ml = 0.046 L

C₁V₁ + C₂V₂ = C × total volume

0.5010  × 0.0175 + 1.1250 × 0.046 = C × 0.0635 L

C = 0.0077 + 0.052 / 0.0635 L

   = 0.94 M

The concentration of a substance is the quantity of solute found in a given amount of solution. Concentrations are normally expressed in terms of molarity, defined because of the variety of moles of solute in 1 L of solution.

The Concentration of an answer is a measure of the quantity of solute that has been dissolved in a given amount of solvent or answer. A concentrated answer is one that has a rather huge quantity of dissolved solute.

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The emitting element's atomic number and atomic mass number are both reduced by 2 and 4 respectively by alpha radiation. The atomic number of an element is increased by 1 by beta radiation, but the atomic mass number is unaffected. The atomic number or the atomic mass number are unaffected by gamma radiation.

An unstable atom will release energy on its own to move into a more stable state, which is radioactivity. The energy that is released by a radioactive atom is known as ionizing radiation. The term "radioactive isotope" refers to radioactive atoms of the same element with varying neutron counts.

Alpha radiation decreases the atomic number and atomic mass number of the emitting element by 2 and 4 correspondingly. Beta radiation raises an element's atomic number by 1, but it has no effect on its atomic mass number. Gamma radiation has no impact on the atomic number or atomic mass number.

The atomic or mass number are unaffected by the emission of gamma rays, however the nucleus will become more stable. The most significant change in atomic number and mass number is brought on by alpha radiation.

A table showing how each type of radiation affects the atomic number and mass number of an atom is attached in the image below.

Thus, The emitting element's atomic number and atomic mass number are both reduced by 2 and 4 respectively by alpha radiation.

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