1. What mass of CO₂ can be produced from 25.0 grams of CaCO3, given the decomposition
reaction below? CaCo3=CaO+CO2

Answer:

1 2/15

Explanation:

2/3 + 7/15 = 17/15 =1 2/15

Answer: 40.3

Explanation:

In the reaction, we see that for every 3 moles of oxygen gas consumed, 2 moles of rust are formed.

So this means that if 60.5 moles of oxygen gas are consumed, then (60.5/3)(2)=40.3 moles of rust can be formed.

The amount of heat gained by the water is 500 calories. Thus, option D is correct.

Given:

Mass of water (m) = 100 g

Change in temperature (ΔT) = 30°C - 25°C = 5°C

The specific heat capacity of water (c) is approximately 1 calorie/gram°C.

Now, the amount of heat gained by the water,

Q = mcΔT

Where:

Q is the heat gained or lost by the substance

m is the mass of the substance

c is the specific heat capacity of the substance

ΔT is the change in temperature

Plugging in the values into the formula:

Q = 100 × 1 × 5

Q = 500 calories

Therefore, the amount of heat gained by the water is 500 calories.

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Answer:

D

Explanation:

The two atoms must be of the same element in order for two atoms  to share electrons equally in a chemical bond.

An element is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.

Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.

The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.

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Answer:

A

Explanation:

it releases 4

334 J/g of heat energy

hope its correct

The oxidizing agent in the reaction Fe + \(AgNO_3\)→ \(Fe(NO_3)_3\) + Ag is option a \(AgNO_3.\)

A redox reaction is one in which the oxidation states of two species undergo changes. Iron is oxidized in the reaction, while silver nitrate is reduced. One of the reactants is being reduced, whereas the other is being oxidized.The oxidizing agent is the species that is being reduced, and it is the species that accepts electrons.

Fe is being oxidized in this reaction. Therefore, it cannot be the oxidizing agent, nor can\(Fe(NO_3)_3\). In contrast, \(AgNO_3.\)  is being reduced, which means it is accepting electrons. This is why\(AgNO_3.\)  is the oxidizing agent.The correct answer is  option a.

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In the allyl cation, all the bond lengths are equal and the positive charge is delocalized over all the three carbon atoms.

The allyl cation has the formula C2H5+. In the allyl cation, the positive charge is delocalized over the three carbon atoms as shown in the image attached. Hence, relevant resonance structures can be proposed for the allyl cation.

The bond lengths in the allyl cation are intermediate between the bond lengths of double bonds and single bonds. All the bond lengths are equal.

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The descriptions and scientific names of both animals, it can be concluded that the physical lynx and bobcat are not the same species as they have different scientific names - Lynx canadensis and Lynx rufus.

The differences in their physical characteristics, such as the pattern and visibility of their tail and ear tufts, further support the idea that they are different species. However, they are in the same genus, which is Lynx. Therefore, option C is the correct answer. It is important to note that even though they are different species, they share similar characteristics and are often confused with each other. Both the lynx and bobcat are medium-sized wild cats that are native to North America and are known for their elusive nature and hunting abilities.

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In the given reaction of Sulfur dioxide and calcium carbonate, for complete reaction, 1.90 tons of sulfur dioxide would require 2.9 tons of Calcium carbonate.

Balancing a chemical equation follows the law of mass conservation. The quantity of an element in the product and in reactants should be the same. Balanced equation of the reaction:

2CaCO3 + 2SO2 + O2 → 2CaSO4 + 2CO2

Two moles of calcium carbonate react with two moles of sulfur dioxide and give two moles each of calcium sulfate and carbon dioxide.

One ton is equal to a thousand kilograms and one kilogram is equal to a thousand grams. Which means one ton is equal to 10^6 grams.

The moles of a compound are obtained using the following formula:

Moles = given mass in grams/ molar mass

Tons of SO2  = 1.90 tons

Molecular mass of SO2  = 64

Moles of SO2  = (1.90 x 10^6) /64 = 0.029 x 10^6  

Now, 0.029 x 10^6  moles of SO2 would completely react with 0.029 x 10^6 moles of CaCO3.

The molar mass of CaCO3 = 40+12+16+16+16 =100

Grams in 2.9 x 10^6  moles of CaCO3 = moles x molecular mass

Grams in 2.9 x 10^6  moles of CaCO3= 100 x  0.029 x 10^6

Grams in 2.9 x 10^6  moles of CaCO3 = 2.9 x 10^6

In conclusion, 1.90 tons of sulfur dioxide would require 2.9 tons of Calcium carbonate to react completely.

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The answer is e) 1.84 x 102 g. This means that 184.16 grams of table salt are needed to provide 72.0 grams of sodium.

Table salt, also known as sodium chloride, is a common chemical compound used in various applications. It is composed of two elements: sodium and chlorine, with sodium accounting for 39.1% of the compound's mass. In this problem, we are asked to determine how many grams of table salt are needed to provide 72.0 grams of sodium.

To solve this problem, we can use the information that table salt is 39.1% sodium by mass. This means that in every 100 grams of table salt, 39.1 grams is sodium. We can use this proportion to determine how much table salt is needed to provide 72.0 grams of sodium.

Let x be the amount of table salt (in grams) needed to provide 72.0 grams of sodium. Using the proportion, we can set up the following equation:

39.1/100 = 72.0/x

To solve for x, we can cross-multiply and simplify:

39.1x = 7200

x = 7200/39.1

x ≈ 184.16

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Answer:

D Robert Boyle

Explanation:

Answer:

The overall charge of the oxygen atom is zero, because the atom contain an equal number of electrons and protons.

Explanation:

Pls brainliest

A vehicle traveling at a speed of 12.5 m/s is equivalent to  4.171 x 10⁻⁸ light years per year.

To convert a speed from meters per second to light years per year, we need to use conversion factors.

1 light year = 9.461 x 10¹⁵ meters

1 year = 31,536,000 seconds

So, to convert 12.5 m/s to light years per year using the conversion factor, 1 year = 31,536,000 seconds:

12.5 m/s = 12.5 x 31,536,000 m/year

12.5 m/s = 3.9468 x 10⁸ m/year

Now, we can convert meters per year to light years per year using the conversion factor 1 light year = 9.461 x 10^15 meters:

3.9468 x 10⁸ m/year = (3.9468 x 10^8 m/year) / (9.461 x 10^15 m/light year)

3.9468 x 10⁸ m/year = 4.171 x 10⁻⁸ light years per year

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In the reaction H─H ⟶ H + H, with an average energy change of 436 kJ/mol (H2 + 436 kJ/mol → 2 H), the correct description is:
a. The energy will be required as bonds are being broken.

When a chemical reaction involves breaking bonds, energy is typically required to overcome the attractive forces holding the atoms together in the molecule. Breaking a covalent bond requires an input of energy, as the atoms involved need to move apart and overcome their mutual attraction.

In the case of the reaction H─H ⟶ H + H, the hydrogen molecule (H2) is composed of two hydrogen atoms held together by a covalent bond. In order to separate the two hydrogen atoms and form two individual hydrogen atoms, the covalent bond must be broken.

This requires an input of energy to overcome the bond's strength and break the attractive forces between the atoms.

The given average energy change of 436 kJ/mol indicates the amount of energy required to break one mole of hydrogen molecules into individual hydrogen atoms. This energy is needed to disrupt the H─H bond and separate the atoms.

Therefore, the correct description for this reaction is that energy will be required as bonds are being broken.

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The molecular weight and the number of equivalents for \(Ca_3(PO_4)^2}\)  is 310.18 g/mol and 12 equivalents.

The molecular weight of \(Ca_3(PO_4)^2}\) can be calculated by adding the atomic weights of all the atoms in the compound.

The atomic weights of calcium (Ca), phosphorus (P), and oxygen (O) are:

Ca: 40.08

P: 30.97

O: 15.99

Therefore, the molecular weight of Ca3(PO4)2 can be calculated as follows:

3Ca + 2P + 8O = (3 x 40.08) + (2 x 30.97) + (8 x 15.99) = 310.18 g/mol

The number of equivalents (eq) of \(Ca_3(PO_4)^2}\) depends on the number of reactive ions or groups that the compound can donate or accept. In this \(Ca_3(PO_4)^2}\) contains 3 calcium ions and 2 phosphate ions.

Calcium ions (\(Ca_2\)+) have a valence of 2, meaning they can donate two electrons or accept two electrons. Therefore, each calcium ion has two equivalents.

Phosphate ions (\((PO_4)^2}\)-) have a valence of 3-, meaning they can donate three electrons or accept three electrons. Therefore, each phosphate ion has three equivalents.

To calculate the total number of equivalents in \(Ca_3(PO_4)^2}\), we can multiply the number of ions by their respective equivalents:

3 x 2 equivalents (for calcium ions) + 2 x 3 equivalents (for phosphate ions) = 12 equivalents

Therefore, \(Ca_3(PO_4)^2}\)has a molecular weight of 310.18 g/mol and 12 equivalents.

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Anything that includes water as a solvent is called an aqueous solution.

Answer:

Ways we use radio waves on Earth are television and FM and AM radio broadcasts, military communications, mobile phones, ham radio, wireless computer networks, and numerous other communications applications.

Explanation:

Ways we use radio waves on Earth are television and FM and AM radio broadcasts, military communications, mobile phones, ham radio, wireless computer networks, and numerous other communications applications.

An electromagnetic wave of a frequency between about \(10^4\) and \(10^{11}\)or \(10^{12}\) Hz, as used for long-distance communication.

AM and FM Radio Broadcasting which involves transmitting sound to a wide audience.

Radar is a detection system that uses radio waves to get information about objects.

Bluetooth and wireless communication use radio waves to create connections between devices.

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Answer: 2% w / w solution means grams of solute is dissolved in 100 grams of solution. ... 5% v / v solution means 5 ml of solute is dissolved 100 ml of solution.

Explanation:

so (w/w)% u would need a number to use it.

Answer:

its ability to lose electron

The reactivity of an alkali metal is determined by its ability to loose electrons.

The alkali metals are highly electropositive. They easily loose electron to form a univalent positive ion.

This ability to form a univalent positive ion increases down the group hence cesium is the most electropositive element in nature.

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The correct option is B. In the SN2 reaction, the mechanism will be simultaneous bond-making and bond-breaking occurs.

A reaction refers to the process in which two or more molecules interact and undergo chemical changes to form different molecules. During a chemical reaction, the molecules involved can break apart, rearrange, and form new chemical bonds. This process involves the transfer or sharing of electrons between the reacting molecules.

Reactions can be classified into different types based on their characteristics, such as exothermic or endothermic, reversible or irreversible, and acid-base, oxidation-reduction, or precipitation reactions. In addition, reactions can be influenced by various factors such as temperature, pressure, concentration, and catalysts.

Understanding chemical reactions are important for many applications in various fields, such as in the design of new drugs, the development of new materials, and the production of chemicals and fuels. Chemists use various tools and techniques to study and analyze chemical reactions, such as spectroscopy, calorimetry, and computational methods.

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Answer:

D

Explanation:

Solvent is the material that is dissolving another material​. Thus, option D is correct.

A solvent is a substance that dissolves another substance to form a solution. The substance that is being dissolved is called the solute, and the substance that is doing the dissolving is called the solvent. The solute is usually present in a smaller amount than the solvent, and it is the solvent that determines the physical properties of the solution, such as its density, viscosity, and boiling point.

For example, when salt is dissolved in water, the salt is the solute and the water is the solvent. The water molecules surround the salt molecules and break them apart, so that the salt ions are free to move around in the solution. The solution is then a homogeneous mixture of salt ions and water molecules.

Thus, option D is correct.

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Answer:

d on edge my guys.

Explanation:

Answer:

latent heat of condensation will have the same absolute value as the latent heat of vaporization. The latent heat of condensation will be negative. The latent heat of condensation is a characteristic property that can be used to identify a substance.

Explanation:

Answer:

energy absorbed or released by a substance during a change in its physical state (phase) that occurs without changing its temperature.

Explanation:

A compound Boolean expression created with the AND operator is true only if both of its subexpressions are true.

A Boolean expression is an expression in which values are either true or false. It is mostly used in programming languages. True and false are denoted by 1 and 0 respectively.

The basic Boolean operators are AND, OR, and NOT. In OR operation, the value is true if either one or the values are true.  Not operator also known as negation converts the true value into false and vice versa.

Boolean algebra is the basic fundamental of digital circuits and programming languages.

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Answer:

2.5 atm

Explanation:

P = Pressure

V = Volume

P1V1 = P2V2

1 x 5 = P2 x 2

5 = P2 x 2

Divide both sides by 2

5/2 = P2 x 2/2

P2 = 2.5

Answer:

Sb: Antimony

Si: 14 (atomic Number)

S: 32.06 u (atomic mass)

Explanation:

Less evaporation means that less of the sun's energy is used to convert water into water vapor, and more of it is used to heat up the surface. In urban areas, there is typically less vegetation and more impervious surfaces (such as concrete and asphalt), which reduces the amount of water that can evaporate.

This means that more of the sun's energy is absorbed by the surface, leading to higher temperatures. Additionally, buildings and other structures in urban areas can trap heat and prevent it from dissipating, further contributing to the urban heat island effect.

In rural areas, vegetation and soil moisture play an important role in regulating temperature through a process called evapotranspiration. Evapotranspiration is the combined process of water evaporation from the soil and plant transpiration. It helps to cool the air by removing heat from the surface through the transfer of water from the surface to the atmosphere.

In contrast, urban areas have a significant amount of impervious surfaces like concrete, asphalt, and buildings, which reduce the amount of vegetation and soil moisture. As a result, urban areas have less evapotranspiration, which means less cooling effect from the evaporation of water. This leads to a higher surface temperature in urban areas.

Furthermore, urban areas have a higher proportion of dark-colored surfaces, such as asphalt and concrete, which absorb more solar radiation than lighter-colored surfaces like vegetation and soil. This is known as the "urban heat island effect," which further contributes to higher temperatures in urban areas.

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