Calculate the temperature change of copper metal that has a mass of 43.2 g and is allowed to absorb 1,345 J of heat. The specific heat capacity of copper is 0.385 J/°c g.

Elements are a substance that is the smallest unit and can't be divided further. The number of valence electrons determines the reactivity with other elements.

Valence electrons are the electrons that are found in the outermost shell of the atom. These electrons take part in chemical reactions to form chemical bonds.

The number of these electrons will help determine how the unknown element reacts with the other elements chemically as valence electrons are responsible for the chemical bond formation.

Therefore, the valence electrons of the unknown element are used to determine the property.

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The weight of aluminum are required to produce 8.70 moles of aluminum chloride is 234.9 g

Aluminum chloride is useful for the treatment of palmar, plantar, and axillary hyperhidrosis.

Aluminum chloride has also been reported to be useful in facial and scalp hyperhidrosis

The balanced chemical equation represents the mole ratio in which the chemicals combine.

In this case, illustrates that 2 mol Al produces 2 mol Al Cl₃, hence these 2 chemicals are in a 1:1 ratio.

Thus, to produce 8.70 mol aluminium chloride, it will require 8.70 mol aluminium.

But this quantity of Al has a mass in grams of

m = n × Mr

   = 8.70 mol × 27g/mol

   = 234.9 g

Hence, The weight of aluminum are required to produce 8.70 moles of aluminum chloride is 234.9 g

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Raft spider's light weight and large surface area allow it to walk on water.

Raft spiders are a specie of siders that can move on the surface of water. They are found around the  north-western and central Europe.

The following apply to the raft spiders;

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Answer:

HBr + KOH -> KBr + H₂O

Explanation:

Acid-base reactions always produce a salt [KBr] and water [H₂O].

Out of the given reactions, the reaction HBr + KOH -> KBr + H₂O is an acid base reaction.

An acid–base reaction is a chemical reaction that occurs between an acid and a base and results in the formation of salt and water.

Here in this reaction HBr + KOH -> KBr + H₂O, HBr is an acid and KOH is a base, together they undergo a neutralization reaction to form a salt KBr and water .

An acid-base reaction involves the transfer of protons (H⁺) between an acid and a base. Acids are the substances which can donate protons, while bases are substances that can accept protons.

In an acid-base reaction, the acid donates a proton (H⁺) to the base, forming water (H₂O) and a salt. The salt is typically formed by the cation of the base combining with the anion of the acid.

In this reaction, HBr donates a proton (H⁺) to KOH, which acts as a base and accepts the proton to form water (H₂O), while KBr is formed as a salt. This is a classic example of an acid-base reaction, where an acid and a base react to form a salt and water.

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Answer:

Hollow bones allow the birds to fly. They're quite dense, and that density allows for flight! Because we humans do not have hollow bones, our bodies are much too heavy to fly on our own. If we did, we'd probably be able to fly.

Explanation:

Answer:

on the surface of the cathode

The chemical element that is formed when I-131 undergoes beta-minus decay is Xe.

A beta minus decay is one in which an electron is changed into a proton. The atomic number of the daughter nucleus will increase by one unit and is one place after the parent in the periodic table.

The chemical element that is formed when I-131 undergoes beta-minus decay is Xe.

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Answer:

mining of clay limestone and then heated to a certain temperature of 1450⁰ in a cement kiln

The molecular formula CH₃CH(CH₃)₂ is the condensed formula for the hydrocarbon methylpropane.

Organic compounds are compounds that are obtained from organic materials.

The most common organic compound are the hydrocarbons,

The hydrocarbons includes the alkanes, alkenes, alkynes, etc.

The given compound CH₃CH(CH₃)₂ is the condensed formula for the hydrocarbon methylpropane.

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Answer: 18 g

Explanation:

[tex]0.12=\frac{\text{mass of NaCl}}{140}\\\text{mass of NaCl}=(0.12)(140)=16.8 \text{ g}[/tex]

The option closest to this is 18 g

Answer: C, 1.68 x 10^-21

Explanation: Edge 2022

Answer:

(C3H6)n

it is made up of carbon and hydrogen atoms.

Answer:

Boil the water and stir in potassium nitrate. If it doesn't all dissolve, you can cook it on the stove or microwave it until the water boils again. Remove the solution from heat, but let it cool slowly for the best crystal formation.

Answer: 8.00 grams

Explanation:

The ratio of carbon and hydrogen must be the same.

Answer: B) the answer is CD with the line on top

Explanation:

Answer:

The cathode reaction is NiO2+H2O+2e−→Ni(OH)2+2OH−.

Answer: a gas

The gas phase is the phase where particles are packed the least tightly together.

The periodic table contains groups and periods that include the elements. For group 1 metal lithium is least likely to lose an electron.

Group 1 metals are the alkali metals that include, Li, Na, K, Rb, and Cs. They show the property exhibited by the metals. The chemical trends of group 1 show that cesium loses an electron more easily than the other elements.

When going down the group the tendency to lose electrons increases as the atomic radius increases. The electron gets far away from the nucleus making it easy to get removed.

Therefore, lithium being the first element of the group has the smallest radii and is least likely to lose an electron.

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Answer:

mass number=126

Explanation:

57+69=126

Answer:

[tex]\text{No. of moles} = \dfrac{\text{Mass of substance(Li)}}{\text{Molar mass of of substance(Li)}}\\\\\\~~~~~~~~~~~~~~~~~=\dfrac{70}{6.94}\\\\\\~~~~~~~~~~~~~~~~~=10.08~ \text{mol.}[/tex]

The  o-xylene, m-xylene, and p-Xylene are constitutional isomers. The correct option is D.

Isomers are the elements or polyatomic elements that have similar molecular formula.

All options are attached here:

A.optical isomers

B.structural isomers

C.geometric isomers

D.constitutional isomers

Thus, the correct option is D.constitutional isomers.

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Answer:

.6 M

Explanation:

.45 moles / .750 liters = .6 M

The noble gas, Helium has only two electrons with the electronic configuration as 1s2. Hence, it does not have a complete octet. and thus, it doesn't follow the octet rule.

An octet is a set of eight. Atoms of each of the noble gases (except helium) have eight electrons in their highest occupied energy levels and the general electron configuration of ns2np6.

Answer:

C

Explanation:

chem ed 2022

When a solid is dissolved into a liquid,

So, option C is correct is one.

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This question involves the concept of excitation energy.

The energy level to which the atom is excited is "4".

The excitation energy of an atom is defined as the energy required by the atom to get excited from one energy level to some upper energy level. Mathematically, it can be given by the following formula:

[tex]E=E_o(\frac{1}{n_i^2}-\frac{1}{n_f^2})[/tex]

where,

E = excitation energy = [tex]\frac{hc}{\lambda} = \frac{(6.63\ x\ 10^{-34}\ J.s)(3\ x\ 10^8\ m/s)}{9.725\ x\ 10^{-8}\ m}=2.04\ x\ 10^{-18}\ J[/tex]

E (in eV) = [tex](2.04\ x\ 10^{-18}\ J)(\frac{1\ eV}{1.6\ x\ 10^{-19}\ J})[/tex] = 12.78 eV

h = plank's constant = 6.63 x 10⁻³⁴ J>s

c = speed of light = 3 x 10⁸ m/s

λ = wavelength = 97.25 nm = 9.725 x 10⁻⁸ m

E₀ = energy of hydrogen atom in ground state = 13.6 eV

[tex]n_i[/tex] = initial orbit = 1

[tex]n_f[/tex] = final orbit = ?

Therefore,

[tex]12.78\ eV=13.6\ eV(\frac{1}{1^2}-\frac{1}{n_f^2})\\\\\frac{12.78\ eV}{13.6\ eV}=1-\frac{1}{n_f^2}\\\\\frac{1}{n_f^2}=1-0.94\\\\n_f^2=\frac{1}{0.06}\\\\n_f=\sqrt{16.67}\\n_f = 4[/tex]

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Answer:

MgBr

NaCl

Explanation:

Answer:

Wave particle duality is most apparent in analyzing the motion of. an electron. A photon of which electromagnetic radiation has the most energy.

Wave particle duality is most apparent in analyzing the motion of an electron.

Wave-Particle duality used to realize the particle and wave nature of light. Based on the idea that light and all other electromagnetic radiation may be considered a particle or a wave nature, in 1923 physicists Louis De Broglie suggested that the same kind of duality must hold to matter.

For example, an electron that produced part of an electric current in a circuit behaves like a particle moving in unison with other electrons inside the conductor. The same electron acts as a wave when it passes over through with a solid crystalline structure and forms a diffraction image.

A photon of which electromagnetic radiation has the most energy.

Thus, Wave particle duality is most apparent in analyzing the motion of. an electron.

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