Can someone please help with this Thermochemical Equation

The balanced thermochemical equation for the combustion of methane gas is:
Calculate much heat is released when 4.5 moles of methane gas undergo a combustion reaction.

Explanation:

Molarity = Moles /Volume = 2.2/1.3 = 1.7 M

Answer:

Mixture

Explanation:

Jewelry is a Mixture. This is because of the variation in it's composition.

Elements

Elements are pure substances. The fact that jewelry gold is mixed with other medals means it is no longer a single entity, hence not an element.

Compound

Compound are substances that are bonded together with a fixed composition. This means the jewelry gold is not a compound

Jewelry is a Mixture

The following information should be considered:

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Answer:

true

Explanation:

Answer:

condensation

Explanation:

hope it is helpful

Answer:

as for my answer is C.....

Answer:

Hydochloric acid

HCl

Explanation:

Hydrochloric acid is an acid and ionizes to form hydrogen and chloride ions.

The name of the compound that gives hydrogen ion and chloride ions in the solution state is Hydrochloric acid.

Hydrochloric acid is made up of one atom of hydrogen and 1 atom of chlorine. We can also say, it is made up of 1 mole of hydrogen and 1 mole of chlorine.

 The formula of this compound is HCl;

 In solution:

               HCl\(_{aq}\)    →   H⁺    +    Cl⁻  

Answer:

The answer is B.

Explanation:

The logical explanation is that fossils from animals are changing over time caused by enviroment change ,natural disaters,astronmical events,and so on.These organisms  need to adapt over time and so there features change.For Example the dragon fly used to be as big as a bus now that it has adapted and changed from when the cretaceous period it is as small as your index finger.

Answer:

the answer should 126 859.2 m2

Answer:

it blows up very lighty

Explanation:

The given compounds are Enantiomers

Enantiomers are the chemicals that make up the given pair. One of the two stereoisomers is a mirror image of the other but cannot be superposed, much as how one's left and right hands are mirror images of one another but cannot appear identical only by being reoriented. When a chemical has a single chiral atom or another comparable structural feature, it can have two possible structures that are non-superposable and mirror images of one another.

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Which of the halves that of compounds will make up the buffer solution in a solution Any of the halves that of substances, when present in a solution, will make it a buffer solution None of the above.

As a result, it's essential to have liquids whose pH doesn't really alter even when strong alkalies nor strong acids are added. These are referred to as buffer solutions. The ability of a buffer to withstand a change in pH is known as buffer capacity.

it can neutralize a small amount of additional acid or base, the pH of the liquid is kept comparatively steady.

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Based on the electronegativity differences between atoms, the most accurate scientific claim regarding the bonding in Mg(NO3)2(s) is that it involves ionic bonding between magnesium and nitrate ions.

1. Identify the elements involved: Magnesium (Mg), Nitrogen (N), and Oxygen (O) are the elements present in Mg(NO3)2(s).

2. Determine the electronegativity values: Mg has an electronegativity of 1.31, N has an electronegativity of 3.04, and O has an electronegativity of 3.44.

3. Compare the electronegativity values: The difference between Mg and N is 1.73, and between Mg and O is 2.13, which are significant differences in electronegativity values.

4. Identify the bonding type: Large electronegativity differences (usually >1.7) indicate ionic bonding. In this case, magnesium loses two electrons to form Mg2+ ions, and each nitrate ion (NO3-) accepts one electron. Two nitrate ions are needed to balance the charge, forming Mg(NO3)2.

Therefore, the bonding in Mg(NO3)2(s) is primarily ionic, involving the transfer of electrons between magnesium and nitrate ions.

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Quinone is an example of a T cell immune system.

These refers to the cells and organs present in organisms which are responsible in providing resistance to germs and infections.

T cells form part of the immune system and provide adaptive immune response through attacking foreign bodies in the body.  Quinone reacting with skin proteins and creating a complex that now triggers an immune response depicts the defense mechanism of T cells.

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The Containment action taken to direct or influence the course of airborne hazardous materials in the form of vapor or gas are known as control systems.

In an industry, the release of harmful gases and chemicals can lead to the contamination of the environment and pose a threat to human health. To prevent this, the installation of air pollution control systems (APCS) is necessary. APCS work by capturing and removing pollutants released in the air by industrial processes. These control systems are used to direct or influence the course of airborne hazardous materials in the form of vapor or gas. APCS include various types of devices such as scrubbers, cyclones, electrostatic precipitators, baghouses, and oxidizers. Scrubbers use a liquid or slurry to remove pollutants. They are highly efficient in removing soluble gaseous pollutants. Cyclones remove particulate matter from gas streams by spinning them. They are commonly used in boilers and incinerators. Electrostatic precipitators are used to capture and remove fine particulate matter. They are mostly used in coal-fired power plants. Baghouses filter out larger particulate matter and are widely used in cement, paper, and pharmaceutical industries. Oxidizers are used to remove volatile organic compounds (VOCs) and other air pollutants. APCS are essential in reducing air pollution. By removing pollutants from industrial processes, they help to protect human health, improve indoor air quality, and prevent environmental contamination.

APCS are critical in controlling the release of harmful gases and chemicals in industries. They work by capturing and removing pollutants released in the air by industrial processes. APCS include various types of devices such as scrubbers, cyclones, electrostatic precipitators, baghouses, and oxidizers. These control systems are highly efficient in removing soluble gaseous pollutants, particulate matter, and volatile organic compounds. They are essential in reducing air pollution, protecting human health, and preventing environmental contamination.

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Based on the given precipitation reaction, the correct answer is: NiS(s) + 2NH₄Cl(aq)

The solubility rules are used to predict the products that will be formed in precipitation reactions. These rules state that certain salts are insoluble in water, while others are soluble. This means that when two aqueous solutions are mixed, if one of the products is insoluble, it will form a solid (precipitate) and the other product will remain in solution.

In this case when you mix nickel (II) chloride and ammonium sulfide, they react to form nickel (II) sulfide, which is insoluble in water and therefore precipitates out of the solution. The ammonium chloride remains in solution.

Therefore, the balanced chemical equation for this precipitation reaction is:

NiCl₂(aq) + (NH₄)₂S(aq) → NiS(s) + 2NH₄Cl(aq)

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The ideal gas law equation can be used to make certain assumptions about the isothermal processes of O2 (l, 1 atm) to O2 (l, 1000 atm).The assumptions for the isothermal processes of O2 (l, 1 atm) to O2 (l, 1000 atm) are as follows:

1. The temperature remains constant since the process is isothermal.2. The system is closed and therefore the number of O2 molecules remains the same.3. There is no change in the internal energy of the system since the process is isothermal.4. The gas is assumed to be ideal which means that it follows the ideal gas law equation.5. There is no change in the volume of the system since the process is isothermal and the system is in a liquid state.

The ideal gas law equation can be expressed as PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature. At constant temperature, the ideal gas law equation can be simplified to PV = constant.Using the ideal gas law equation, the initial pressure can be calculated as P1 = (nRT)/V1 and the final pressure can be calculated as P2 = (nRT)/V2.

Since the temperature remains constant, the equation can be simplified to P1V1 = P2V2.The above assumptions and equation are applicable for the isothermal processes of O2 (l, 1 atm) to O2 (l, 1000 atm). The ideal gas law equation can be used to calculate the pressures and volumes at different stages of the isothermal process.

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Answer:

is a small, circular double-stranded DNA molecule that replicates autonomously.

Explanation:

hope this helps

Answer:

i think

they are used to male the animal grow

Once the animal eats the food, the atoms in food are  used to make the animal grow.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

Water, H2O, is a pure substance, a compound made of hydrogen and oxygen. Although water is the most abundant substance on earth, it is rarely found naturally in its pure form. Most of the time, pure water has to be created. Pure water is called distilled water or deionized water.

The volume of the gas at a pressure of 150 torr and a temperature of 200 K can be calculated using the combined gas law.

Using the formula:

(P1 * V1) / (T1) = (P2 * V2) / (T2)

where:

P1 = 300 torr (initial pressure)

V1 = 50.0 mL (initial volume)

T1 = 400 K (initial temperature)

P2 = 150 torr (final pressure)

T2 = 200 K (final temperature)

We can rearrange the formula to solve for V2 (final volume):

V2 = (P1 * V1 * T2) / (P2 * T1)

Plugging in the given values:

V2 = (300 torr * 50.0 mL * 200 K) / (150 torr * 400 K)

V2 = 20 mL

Therefore, the volume of the gas at a pressure of 150 torr and a temperature of 200 K will be 20.0 mL.

The problem can be solved using the combined gas law, which states that the ratio of the product of pressure and volume to the temperature is constant for a given amount of gas. By rearranging the formula and substituting the given values, we can solve for the final volume (V2). The final volume is found to be 20.0 mL.

The gas will have a volume of 20.0 milliliters at a pressure of 150 torr and a temperature of 200 K.

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The potential energy diagram is a common way of depicting the reaction profile. The following are true about the diagram;

A potential energy diagram is a diagram that shows the conversion of reactants to products. It can tell us whether the reaction is endothermic or exothermic.

1) From the diagram, the activation energy of the reaction = 65 kJ - 30 kJ = 35 kJ

2) The enthalpy change of this reaction = 55kJ - 30 kJ = 25kJ.

3) The slope of the diagram is positive.

4) The reaction is endothermic.

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Explanation:

The age of the cat and presumably the village is approximately 13657 years. .

Half-Life is the time taken for half the amount of a substance to disappear.

To determine the age of the cat fossil, the following should be noted:

Mass of carbon in the sample = 0.194 × 10 lb = 1.94 lb

Ratio of carbon-12 to carbon-14 = 1 : 1.35 × 10^-12

Mass of carbon-14 initially present = 1.94 × 1/1.35 × 10^-12 = 2.619 × 10^-12

Ratio of present and original mass of carbon-14 = (5 × 10-13)/2.619 × 10^-12 =

The half-life of carbon-14 = 5700 years

The ratio of the mass of carbon-14 at present and initially = 0.191

Using the half-life formula, to calculate time elapsed:

\(t = \frac{t_{\frac{1}{2}}ln\frac{N_t}{N_o}}{-0.693}\)

Substituting the values to solve for time, t, in years

\(t = \frac{5700 \times \: ln(0.191) }{-0.693} = 13656.8\)

Time elapsed, t = 13656.8 years.

Therefore, the age of the cat and presumably the village is approximately 13657 years.

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Answer:

The answer is Conduction.

C4 photosynthesis is more efficient than C3 photosynthesis in tropical climates because it has a unique biochemical pathway that allows it to conserve water better.

This is especially important in hot and dry tropical regions where water is limited.

In C4 plants, the initial step of carbon fixation occurs in mesophyll cells, which are better adapted to handling high light intensities and high temperatures.

The carbon dioxide is then transported to bundle sheath cells, where it is concentrated before undergoing the Calvin cycle.

This concentration step reduces photorespiration and enhances the efficiency of carbon fixation.

Therefore, C4 plants are able to maintain high rates of photosynthesis even in tropical climates.

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