What happens during every chemical change?
A. Heat or light is produced.
B. Two substances combine to make a different substance.
C. One type of matter becomes another type of matter.
D. Matter changes from one state to another.
pleaase helpppp

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Answer: Magnesium and Bromine/MgBr2 = Ionic compounds

Explanation: When atoms form together they can form between Ionic Compounds and molecules; this could depend on if they're joined by Covalent bonds as well because when atoms form with Covalent bonds, it forms Molecules.

Answer:

The car has been on the road for 0.49 hours

Explanation:

A car is traveling 35 miles/hr for 17 miles.

Speed of a car = 35 miles/hr

Distance travelled = 17 miles

The relationship between speed, distance, and time is given by

Distance = Speed × Time

Put Speed = 35 miles/hr, Distance = 17 miles

\(17=35\) × Time

Time = \(\frac{17}{35}=0.49\) hours

So, the car has been on the road for 0.49 hours

The time car has been on the road has been 0.49 hours. Thus, option D is correct.

Speed can be defined as the distance traveled by the object in unit time. The speed can be expressed as:

\(\rm Speed\;=\;\dfrac{Distance}{Time}\)

The car has been given to be traveling at:

Speed = 35 miles/hr

Distance traveled = 17 miles.

The time taken by car to travel 17 miles can be calculated by substituting the values as:

\(\rm 35\;miles/hr\;=\;\dfrac{17\;miles}{Time}\\\\\\\\Time\;=\;\dfrac{17\;miles}{35\;miles/hr}\)

Time = 0.49 hr.

The time taken by car to travel 17 miles has been 0.49 hours. Thus, the correct option has been D.

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Given what we know, we can confirm that despite not being able to provide a visual representation, if you were to create one, it would show the atoms in the substance moving with more and more energy over time until vaporization occurred.

Therefore, given that vaporization is when atoms within a substance gain so much kinetic energy that they are able to rupture the bonds that hold them relatively close together and change into a gas, we can confirm that a visual representation would have to be a diagram showing the increased movement of atoms over time.

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Answer: C (8 dots)

Explanation:

The electron configuration of an atom refers to the arrangement of electrons in the atom's outermost energy level, or valence shell. An electron configuration of 2-6 refers to a total of 8 electrons in the valence shell, with 2 in the first energy level and 6 in the second.

Answer:

ii and iii

Explanation:

Beryllium, Hydrogen and Neon elements will become positive when they become ions. Hence, options I, II and IV are the correct answer.

There are two types of ion:

Cation: When an atom loses electrons, it will form a positive ion known as a cation.

Anion: When an atom gains electrons, it will form a negative ion known as an anion.

Be will become \(Be^{+2}\), H will become \(H^+\) and Ne will become \(Ne^+\)

Hence, options I, II and IV are the correct answer.

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The change in entropy of the gas is 27.6 J/K.

Entropy of a gas:

Entropy of a gas is the measure of the disorder or randomness of the particles in a system. The second law of thermodynamics states that in an isolated system, the total entropy will always increase over time, indicating that the disorder of a system will always increase if it is left alone.

A diatomic ideal gas begins at a volume of 1.91 m3, a pressure of 105 kPa and a temperature of 21oC. It undergoes a constant volume process that triples its temperature. The change in entropy of the gas is J/K.

The relationship between entropy and temperature is given by:

\($$\Delta S = nC_{v}ln\frac{T_{2}}{T_{1}}$$\)

Where , ΔS is the change in entropy of the gas,

n is the number of moles of the gas,

Cv is the heat capacity at constant volume,

T2 is the final temperature of the gas and

T1 is the initial temperature of the gas.

Since the gas is diatomic, its heat capacity is given by:

Cv = 5/2R  where R is the ideal gas constant.

Therefore, the change in entropy of the gas is:

\($$\Delta S = nC_{v}ln\frac{T_{2}}{T_{1}}$$\)

\($$\Delta S = n(\frac{5}{2}R)ln\frac{T_{2}}{T_{1}}$$\)

\($$\Delta S = (\frac{5}{2})(8.31)ln\frac{3T_{1}}{T_{1}+273}$$\)

At a temperature of 21oC, the initial temperature of the gas is:T1 = 21 + 273 = 294 K.

Substituting T1 into the equation gives:

\($$\Delta S = (\frac{5}{2})(8.31)ln\frac{3(294)}{294+273}$$\)

\($$\Delta S = 27.6 J/K$$.\)

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The daughter isotope which is present in the given radioactive decay is ²¹⁸₈₆R.

A daughter isotope is the isotope that remains following the radioactive decay of an original isotope.

In the question parent nuclei is given that ²²²₈₈R, and given chemical equation is:

²²²₈₈R → ²¹⁸₈₆R + ⁴₂He

In the above equation ²¹⁸₈₆R is the daughter nuclei and ⁴₂He is the emitted particle or rays.

Hence ²¹⁸₈₆R is the daughter isotope.

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Answer:

222 88Ra

Explanation:

The 1H NMR signal for an OH or NH proton usually does not exhibit spin-spin splitting because these protons exchange rapidly with other protons in solution.

This exchange leads to broadening of the NMR signal, making it difficult to observe spin-spin splitting. However, if the exchange rate is slowed down, spin-spin splitting may be observed.

                            Additionally, if the OH or NH proton is part of a larger molecule or functional group, the surrounding atoms and chemical environment can affect the NMR signal and potentially lead to spin-spin splitting.
The statement is true. The 1H NMR signal for an OH or NH proton typically does not exhibit spin-spin splitting due to the rapid exchange of these protons with the surrounding solvent, which effectively averages out the spin-spin interactions. This results in a broad, singlet peak for these types of protons in the NMR spectrum.

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Answer:

0.1988 J/g°C

Explanation:

-Qmetal = Qwater

Q = mc∆T

Where;

Q = amount of heat

m = mass of substance

c = specific heat of substance

∆T = change in temperature

Hence;

-{mc∆T} of metal = {mc∆T} of water

From the information provided in this question, For water; m= 22.0g, ∆T = (24°C-19°C), c = 4.18J/g°C.

For metal; m= 34.0g, ∆T = (24°C-92°C), c = ?

Note that, the final temperature of water and the metal = 24°C

-{34 × c × (24°C-92°C)} = 22 × 4.18 × (24°C-19°C)

-{34 × c × (-68°C)} = 459.8

-{34 × c × -68} = 459.8

-{-2312c} = 459.8

+2312c = 459.8

c = 459.8/2312

c = 0.1988

The specific heat capacity of the metal is 0.1988 J/g°C

Answer:

Firms produce goods and services,which they sell to households in return for revenue.

Answer: Goods and Services

Explanation:

Answer:

17 electron

Explanation:

because the number of the proton and number of electron is equal if ther is no charge

Answer:

8.82 kg es la masa total de leche

Explanation:

Consideraremos que el volumen de cada bolsa de leche es de 900 mL.

Sabiendo que tenemos en total 7 bolsas, el volumen final en litros que tenemos disponible es de:

900 mL . 7 = 6300 mL

Utilizando la densidad podemos calcular la masa de leche que tenemos en el total de las 7 bolsas

Densidad = masa / volumen

Densidad . volumen = masa → 1.4 g/mL . 6300 mL = 8820 g

Convertimos la masa de gramos a kg

8820 g . 1 kg /1000g = 8.82 kg

Answer:

A. 1.73 m = 172 cm

B. 7,651.27 m = 7.65127 Km

Answer:

Well its actually the movement of tectonic plates under the earths surface that when the slide along each other, pull away from each other, or push up against each other they create earth quakes.

Explanation: yes.

Thermolysis, photolysis, and electrolysis are three different forms of breakdown reactions. A single source was cooked to yield two or more objects in each instance (decomposition).

Decomposition reactions happen when complex chemical entities split apart into smaller components. Decomposition reactions often demand energy input. For instance, the thermal breakdown of potassium hydroxide (KClO3) is a typical technique used during laboratories to generate oxygen gas.

Below is a typical illustration of a thermal breakdown reaction. Calcite breaks down into calcareous dioxide and atmospheric co2 when heated. The production of quick lime, a crucial component in numerous industries, uses this procedure.

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Aluminum is a highly reactive metal, and it can undergo reactions with different substances such as acids, oxygen, halogens, and more. The specific reaction determines the product formed.

To determine what happened to the aluminum metal in a reaction and identify the most probable aluminum-containing product, we need more specific information about the reaction or the reactants involved. Aluminum can undergo various reactions, and the product formed depends on the reaction conditions and other reactants involved.

For example, when aluminum reacts with hydrochloric acid (HCl), the reaction produces aluminum chloride (AlCl3) and hydrogen gas (H2):

2Al + 6HCl → 2AlCl3 + 3H2

In this case, aluminum metal is consumed, and the most probable aluminum-containing product is aluminum chloride (AlCl3).

In another example, when aluminum reacts with oxygen (O2) in the presence of heat, the reaction forms aluminum oxide (Al2O3):

4Al + 3O2 → 2Al2O3

Again, aluminum is consumed in the reaction, and the most probable aluminum-containing product is aluminum oxide (Al2O3).

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Answer:

cl+ms=ClMs

Explanation:

just add them together it aint right btw

Answer:

options 3rd is the correct answer

Answer:

28g

Explanation:

To find the moles present in 83.20 grams of manganese we must use the molar mass of manganese. This mass is equal to 54.94g/mol. So the moles of manganese (Mn) will be:

Answer: 83.20 grams of manganese are equivalent to 1.51 moles

Answer:

Carbon dioxide is a compound.

Explanation:

Carbon is the sixth element in the periodic table. Located between boron (B) and nitrogen (N), it is a very stable element. Because it is stable, it can be found both by itself and in many naturally occurring compounds. Scientists describe the three states of carbon as diamond, amorphous, and graphite.

Carbon dioxide (CO2 ) is a chemical compound composed two oxygen atoms covalentl bonded to a single carbon atom. Carbon dioxide: Carbon dioxide is a molecule composed of one carbon atom bonded to two oxygen atoms via two double bonds.

Air is mixture, but not a compound because of the following reasons: Air can be separated into its constituents such as oxygen, nitrogen, etc. by fractional distillation of liquid air. Air shows the properties of all gases present in it.

Oxygen in the atmosphere is a molecule because it contains molecular bonds. It is not a compound because it is made from atoms of only one element - oxygen. This type of molecule is called a diatomic molecule, a molecule made from two atoms of the same type.

Answer:

Its Carbon Dioxide

No : Copper burns in a flame emitting bright white sparks.

Copper burns in flame emitting blue - green color. When we burn copper , we provide heat and the atomic level we are providing energy to the electrons gets excited to the higher energy level. that is excited state and we know that excited is state is unstable , the electron will return to its lower energy state from higher energy state after sometime. the energy is released in this process in the form of photon of specific wavelength emit color. The wavelength that copper emitted is the blue - green color.

Thus, No : Copper burns in a flame emitting bright white sparks.

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Answer:

All waves of the electromagnetic spectrum have a speed of 3 × 10⁸ ms⁻¹

Ignoring stereochemistry, 6 different tripeptides can be formed.

Ignoring stereochemistry, it is noted that there are 6 different tripeptides that can be formed using the same 3 amino acids. Therefore, the correct option is (c) 6.

To explain this further, we can consider the fact that there are 3 amino acid residues to be arranged in a linear sequence to form a tripeptide. Since we are ignoring stereochemistry, we can assume that each of the 3 amino acids is distinct from one another, and therefore can be arranged in 3! = 6 different ways. These 6 different arrangements will result in 6 different tripeptides containing the same 3 amino acids.

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The value of the H-C-H bond angle in ethylene is 117°.

The bond angle is a geometric angle that is formed due to the repulsion between atoms or electrons in a bond. The binding angle for a linear molecule is 180°, for a triangular planar molecule it is 120°, and so on.

The size of the bond angle is affected by the magnitude of the repulsive force of electron pairs in the molecule. The lone pair has a slightly stronger repulsive force than the bonding pair. This happens because the lone pair of electrons is only bound to one atom, so the movement is more flexible.

Determine the bond angles using VESPR theory, such as if the shape of the molecule AX means that it is linear with a bond angle of 180 degrees.

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the answer is B

Explanation:

mineral c is harder than B because A can scratch B and C can scratch A

Answer:

B.Mineral A is softer than Mineral B.

Explanation:

In a mixture of noble gases, the gas that will have the greatest partial pressure is Xenon. Mole fraction can be defined as a unit of concentration used in chemistry to measure the amount of one substance in a mixture of substances.

It is equal to the number of moles of a solute divided by the total number of moles of the solution. Therefore, given that in a mixture of noble gases, neon has a mole fraction of 0.5, argon has a mole fraction of 0.3, and xenon has a mole fraction of 0.2. The partial pressure of each gas can be calculated by using Dalton's Law of partial pressures which states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of each gas in the mixture.

Partial pressure of each gas can be calculated as follows: PNeon = (0.5) x Ptotal PArgon = (0.3) x Ptotal PXenon = (0.2) x Ptotal, where Ptotal is the total pressure of the mixture. Now, we can see that the partial pressure of Xenon will be the greatest because it has the highest mole fraction and will therefore contribute the most to the total pressure.

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