A gas at 49.3 °C and 893 mm Hg
experiences a temperature
change and ends up with a
volume of 778 mm Hg.

What is the new temperature of the gas?

[?] °C

As per the given question, the statement is false, which is that the mass of the water in a calorimeter is not necessary for calorimetry calculations.

Explanation:

The mass of the water in a calorimeter is very important in calorimetry calculations. Calorimetry is the science of measuring heat flows and is commonly used to determine the heat involved in chemical reactions. A calorimeter is a device that can be used to measure the heat transferred in a chemical reaction.

The heat that is produced or absorbed during a chemical reaction is transferred to the surrounding water, which then undergoes a change in temperature. By measuring this change in temperature, the amount of heat involved in the reaction can be determined. However, the accuracy of this measurement depends on the mass of water that is used.

The larger the mass of water, the more accurate the measurement of the heat involved in the reaction. Therefore, it is important to have an accurate measurement of the mass of water in the calorimeter when performing calorimetry calculations.

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Answer: As we all are aware that life on Earth is existed due to several environmental changes and there are several scientific factors of sustainability that support the survival and evolution of life on Earth.

Scientific factors of sustainability include solar energy, chemical cycle, and biodiversity that supported life on Earth. solar energy helps all organism and especially producers to gain energy and store the energy which further used in chemical cycles of transferring energy to other trophic levels.

Chemical cycle also involves the interaction of biotic and abiotic envrionment with each other that leads to environmental changes as well as organisms adapt themselves accordingly.

Biodiversity maintains the balance in the ecosystem and prevent dominancy of one organism otherwise it can lead to scarcity and organism would not be able to survive. Variation in biodiversity due to random mating  in the same species leads to evolution and produces new species of organisms.  

Hence, scientific factors of sustainability play major role in survival and evolution of life on the Earth.

Explanation: Is this what you need

Answer:

Democritus greatest contribution to modern science was arguably the atomic theory he elucidated. According to Democritus' atomic theory, the universe and all matter obey the following principles: Everything is composed of “atoms”, which are physically, but not geometrically, indivisible.

Explanation:

Hope this helps.

Answer:

model of water

Explanation:

Answer:

Atomic number

Explanation:

Because atomic number is unique for each element and never changes

When potassium chloride (KCl) is dissolved in water, the temperature decreases because the energy required to separate the potassium (K) and chloride (Cl-) ions and the energy required to separate the water molecules is greater than the energy produced by the attractions between the K and Cl- ions.

When KCl dissolves in water, the K and Cl- ions are surrounded by water molecules. The process of dissolving involves breaking the ionic bonds between the K and Cl- ions and the formation of new ion-dipole interactions between the ions and water molecules. To separate the K and Cl- ions, energy must be supplied to overcome the attractive forces between them. Additionally, to separate the water molecules, energy is required to disrupt the intermolecular hydrogen bonding between the water molecules. The energy produced by the attractions between the K and Cl- ions is not sufficient to compensate for the energy required to break these bonds. As a result, energy is absorbed from the surroundings, which leads to a decrease in temperature. The endothermic process of dissolving KCl in water, which requires more energy input than energy released, causes the temperature of the solution to decrease.

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Answer:

A homologous series is a family of hydrocarbons with similar chemical properties who share the same general formula. We will look at three hydrocarbon series: alkanes, alkenes and the cycloalkanes. Hydrocarbons are compounds that contain only hydrogen and carbon.

Explanation:

Is it multiple choice?

ethane, ethylene, ethyne methane, methanol, methanalmethane, ethane, propane1-hexene, 2-hexene, 3-hexene

Answer : C

The zero calibration of the electronic balance allows to maintain the precision of one digit.

Electronic measurement equipment has a mechanism to set the zero of the measurement every time the equipment is turned on, this procedure must be carried out to eliminate:

The methods of regurgitating the zero of the balance consists of measuring the weight without masses and bringing this value to zero, in general by changing some adjustable parameter of the balance, for example magnetic field current, reference level with a beam of light.

With this calibration it will be achieved that there is always a precision digit in the readings.

With Electronic Balance Calibration it is possible to have a pressure digit

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Answer:

The zero is the estimated digit.

Explanation:

If the zero was left off of the measurement, people would assume the tenths place was the estimated digit.

Primary pollutants are pollutants that are formed from a chemical reaction between different compounds and are harmful to the environment and human health.

Primary pollutants can be emitted directly into the atmosphere and are mainly the result of human activity.

Coal is a fossil fuel composed of carbon, hydrogen, oxygen, nitrogen, and sulfur, formed over millions of years and extracted from underground deposits.

The primary pollutants produced by burning coal include sulfur dioxide (SO2), carbon monoxide (CO), particulate matter, and nitrogen oxide (NOx).

Sulfur dioxide (SO2), emitted when coal is burned, can cause respiratory problems and contribute to acid rain.

Carbon monoxide (CO), another pollutant produced by burning coal, can lead to carbon monoxide poisoning.

Soot, a form of particulate matter, is also produced when coal is burned and can be harmful to human health when inhaled.

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Answer:

1C + 2S -----> 1CS2

in order to make the reactants carbon and sulfur be equal to the product Carbon 2 Sulfur, we need to have 2 sulfurs on the left side so that both sides have 1 carbon and 2 sulfurs

Answer:

Its still a liquid, only it takes form of the bottle.

Explanation:

When you pour a liquid (water) in a bottle, the water is still water but the water takes shape of the bottle. Hope this helps! Let me know if you need clarification.

The stoichiometric concept is used here to determine the moles of Aluminium used. Stoichiometry is an important concept in chemistry which helps us to use balanced chemical equation to calculate the amount of reactants and products.

Chemical stoichiometry refers to the quantitative study of the reactants and products involved in a chemical reaction. It help us to determine how much substance is needed or is present.

The balanced equation is:

4Al  +  3O₂     →     2Al₂O₃

1.35 mol O₂ × 4 mol Al / 3 mol O₂ = 1.8 mol Al

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- Silver iodide is more soluble in 0.10 M AgCH3COO compared to pure water.

- Silver iodide has similar solubility in 0.10 M NaI as in pure water.

- Silver iodide is less soluble in 0.10 M NH4CH3COO compared to pure water.

- The solubility of silver iodide in 0.10 M KNO3 is not provided in the given information.

Based on the given information, we can compare the solubility of silver iodide (AgI) in each of the following aqueous solutions:

1. 0.10 M AgCH3COO (silver acetate): More soluble than in pure water.

2. 0.10 M NaI (sodium iodide): Similar solubility as in pure water.

3. 0.10 M NH4CH3COO (ammonium acetate): Less soluble than in pure water.

4. 0.10 M KNO3 (potassium nitrate): The solubility is not provided in the given information.

Silver iodide (AgI) is sparingly soluble in water. When comparing its solubility in different solutions, we need to consider the common ion effect and the effect of the anions present.

1. 0.10 M AgCH3COO (silver acetate): This solution contains the acetate ion (CH3COO-), which is a weak base. The common ion effect states that the presence of a common ion (in this case, CH3COO-) decreases the solubility of a salt. However, silver iodide is less soluble in AgCH3COO compared to pure water because the acetate ion is a weak base and does not strongly react with the Ag+ ions, reducing the common ion effect. Therefore, silver iodide is more soluble in AgCH3COO compared to pure water.

2. 0.10 M NaI (sodium iodide): This solution does not contain any common ions with AgI. Therefore, the solubility of silver iodide in NaI solution is expected to be similar to its solubility in pure water.

3. 0.10 M NH4CH3COO (ammonium acetate): This solution contains the acetate ion (CH3COO-) and the ammonium ion (NH4+). Both ions are weak bases, and their presence reduces the solubility of silver iodide due to the common ion effect. Therefore, silver iodide is less soluble in NH4CH3COO compared to pure water.

4. 0.10 M KNO3 (potassium nitrate): The solubility of silver iodide in KNO3 solution is not provided in the given information, so we cannot make a direct comparison.

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Answer:

Explanation:

The main difference between a catalyst and a promoter is the mechanism by which they affect a chemical reaction. A catalyst speeds up a chemical reaction by providing an alternative pathway for the reactants to follow that has a lower activation energy. A promoter, on the other hand, influences the rate of a chemical reaction by changing the adsorption and desorption of reactants on the surface of a catalyst.

Another difference between a catalyst and a promoter is the extent of their effect on the reaction rate. A catalyst generally has a much greater impact on the rate of a chemical reaction than a promoter. For example, a catalyst might increase the rate of a reaction by a factor of 10^6 or more, while a promoter might only increase the rate by a factor of 10 or 100.

Examples:

Platinum is a common catalyst used in the process of catalytic converter, which is used to reduce the emissions of harmful gases from automobile exhaust.

Alumina (aluminum oxide) is often used as a promoter in the production of synthetic fuels from coal or natural gas. The alumina helps to increase the rate at which the reactants are converted to the desired product, resulting in a more efficient and cost-effective process.

Answer:

The correct answer would be D) chlorophylls.

Explanation:

Chlorophyll refers to the green pigment present in cyanobacteria and chloroplasts of plants and algae. It is the pigment which is able to absorb light which makes it an essential element for photosynthesis.

Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

The null hypothesis is rejected when the chi-square value is higher than the critical value or p-value. In this case, the chi-square value of 6.4 is higher than the critical value for a p-value of 0.05, which is 3.84. Therefore, the null hypothesis is rejected.

A cross results in three phenotypes. A null hypothesis of recessive epistasis is tested. Your calculated chi-square value is 6.4. Assuming a p-value of 0.05, do you reject the null hypothesis?The answer is yes.What is a chi-square value?A chi-square value is a measure of how different two sets of data are. It compares the observed data to the expected data and generates a statistic that shows how far apart they are. It compares the observed data to the expected data and generates a statistic that shows how far apart they are. The chi-square test is a statistical hypothesis test that is used to determine if there is a significant difference between two groups of data. The null hypothesis is rejected when the chi-square value is higher than the critical value or p-value. In this case, the chi-square value of 6.4 is higher than the critical value for a p-value of 0.05, which is 3.84. Therefore, the null hypothesis is rejected.

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Answer:MgO reacts with nitric acid

Answer:

The total mass of mercury in the lake is 631,542.7 kg

Explanation:

Question: The given dimensions of the lake as obtained from a similar question posted online are;

The surface area of the lake, A = 100 mi²

The lake's average depth, d = 20 ft.

The concentration of the mercury, C = 0.4 μg Hg/mL = 0.4 × 10⁻⁶ kg Hg/L

Therefore, we have;

The volume of water mixture in the lake, V = A × d

∴ V = 100 mi² × 20 ft. = 2,787,840,000 ft.² × 20 ft. = 55,756,800,000 ft.³

1 ft³ = 28.31685 L

∴ 55,756,800,000 ft.³ = 55,756,800,000 ft.³ × 28.31685 L/ft.³ = 1.57885675 × 10¹² L

The total mass of mercury in the lake, m = C × V

∴ m = 0.4 × 10⁻⁶ kg Hg/L × 1.57885675 × 10¹² L = 631,542.7 kg

The total mass of mercury in the lake, m = 631,542.7 kg.

As a project engineer for Farberware, if I was to develop a new line of baking dishes, I would choose to use covalent compounds as the raw material for the manufacture of baking dishes.Why choose covalent compounds over ionic compounds?Covalent compounds are preferred over ionic compounds because they are much more stable in high-temperature applications.

Baking dishes are exposed to high temperatures when they are used in the oven. The stability of covalent compounds under high temperatures makes them ideal for the production of baking dishes. They don't break down, decompose, or melt when exposed to high temperatures.They also have a better resistance to chemical reaction with food which ensures that the food's taste is not affected by the baking dish material. They can also be easily coated with a non-stick layer which will prevent the food from sticking to the baking dish.

This coating is difficult to achieve on ionic compounds because of their instability under high temperatures.In conclusion, it would be ideal to use covalent compounds as the raw material for the manufacture of baking dishes due to their stability under high temperature, resistance to chemical reactions, and their ease of coating.

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Answer:

the compound that has the smallest ions with the greatest charge

The compound that has the smallest ions with the greatest charge will have the strongest ionic bonds. Therefore, option C is correct.

Ionic compounds can be defined as solids formed by closely packed ions of opposite charge. An Ionic compound is commonly formed when metal combines with non-metal.

In ionic compounds, the ions are held together by ionic bonds. The ions are created by accepting or losing electrons in order to get their nearest noble gas configuration. In a reaction, the metals have a tendency to lose electrons to complete their octet while non-metals will gain electrons to fill their octet.

An ionic bond or electrovalent bond is a type of linkage generated from the electrostatic attraction between oppositely charged ions. Such a bond produces when the valence electrons of one atom are transferred permanently to another.

The more the charge on the ions and the smaller the ions stronger the ionic bond will be formed.

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Three tripeptides would be produced from the partial hydrolysis of ser-leu-gly-gly-ala. These are ser-leu-gly, gly-gly-ala, and leu-gly-gly.

When the amine and carboxylic acid functional groups in amino acids join together to form amide bonds, a chain of amino acid units, called a peptide, is formed.

Peptides are short chains of amino acids usually, containing 2-50 amino acids.

Amino acids are also building blocks of proteins but they usually contain more amino acids.

Peptides are easier to absorb by the body as they are smaller in size.

Partial hydrolysis of peptides produces a mixture of shorter peptides and some amino acids.

The partial hydrolysis of peptide ser-leu-gly-gly-ala produces three tripeptides which are ser-leu-gly, gly-gly-ala, and leu-gly-gly.

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The mass, in grams, of H₂O is produced in the decomposition of ammonium nitrate is 72.06 grams.

Mass of any substance will be calculated by using their moles as:

n = W/M, where

W = required mass

M = molar mass

Given chemical reaction is:

NH₄NO₃ → N₂O + 2H₂O

Moles of 160.1 g of NH₄NO₃ = 160.1g / 80.03g/mol = 2moles

From the stoichiometry of the reaction, it is clear that:

1 moles of NH₄NO₃ = produce 2 moles of H₂O

2 moles of NH₄NO₃ = produce 2×2=4 moles of H₂O

Mass of H₂O will be calculated as:

W = (4mol)(18.01 g/mol) = 72.04 grams (72.06 approx)

Hence, option (4) is correct.

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For boric acid, with a pKa of approximately 9.24, the good buffering capacity occurs over the pH range of 8.24 to 10.24.

Boric acid is a weak acid often used as a buffering agent in contact lens solutions to resist pH changes. Its good buffering capacity is due to its ability to maintain a relatively constant pH level when small amounts of acids or bases are added to the solution. To understand the pH range over which boric acid has a good buffering capacity, we need to look at its acid dissociation constant (Ka) and the Henderson-Hasselbalch equation.

The Ka value for boric acid is approximately 5.8 x 10^-10. The pKa, which is the negative logarithm of the Ka, is calculated as follows:

pKa = -log(Ka) ≈ 9.24

The Henderson-Hasselbalch equation relates the pH, pKa, and the ratio of the concentrations of the conjugate base ([A-]) to the weak acid ([HA]) in a solution:

pH = pKa + log ([A-]/[HA])

A good buffering capacity is achieved when the pH of the solution is within one unit of the pKa value. This is because the ratio of the conjugate base to the weak acid ([A-]/[HA]) is near 1, meaning both the acid and its conjugate base are present in similar amounts, and the buffer can effectively neutralize added acids or bases.

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