1.85 l of a gas is collected over water at 98.0 kpa and 22.0 °c. what is the volume of the dry gas at stp?

On the left side of the chemical process, the reactants are Fe2O3 and C. On the right side of the chemical process, the products are Fe and CO2.

Because the total mass of iron and oxygen in the reactants and the product are equal, the law of conservation of mass is observed.

In a chemical equation, the substance or substances to the left of the arrow are referred to as reactants. When a chemical reaction first begins, a substance is said to be the reactant.

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Answer:

Maybe it's (a) amount of cytoplasm ...

hope its right

Answer:

Option A and C

Explanation:

Generally yield of wheat and rice crop is measured in terms of hundredweight. It is also known as centum weight or quintal. one quintal is equal to 100 Kg. It is used primarily in United States of America and British reign. In India quintal is used to measure the yield of wheat and rice

Hence, option A and C is the correct answer

Answer:

Option C, Rice

Explanation:

Rice is measured in hundredweight as stated in the lesson, wheat isn't mentioned to be measured by hundredweight.

Answer:$$7.50 x 10^23$$

$$H_2SO_4$$?

Explanation:It is a fact that such a quantity has a mass of  

98.08

⋅

g

. Why? Because  

6.022

×

10

23

particles SPECIFIES a molar quantity. And we know (or can calculate) that sulfuric acid has a molar mass of  

98.08

⋅

g

...  

Sirloin steak typically has the lowest water content and the correct option is option 4.

Meat, being a protein-rich food, generally contains a lower percentage of water compared to fruits, vegetables, and bread. While lettuce and tomatoes are primarily composed of water, with high water content contributing to their crispness and juiciness, whole grain bread also retains a significant amount of moisture.

On the other hand, sirloin steak consists mostly of muscle tissue, which contains less water. However, it is important to note that the exact water content can vary depending on factors such as the specific cut of meat, cooking method, and degree of doneness.

Thus, the ideal selection is option 4.

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The pillar of sustainability broken by recycling electronics in India is environmental sustainability. Implementing a law that restricts electronics recycling to the US would not necessarily be the most effective solution, as it overlooks the complex global dynamics of electronic waste management.

Recycling electronics in India often involves improper disposal methods, such as burning or dismantling without proper safety measures. This leads to environmental pollution, including the release of hazardous substances into the air, soil, and water, thus violating the principle of environmental sustainability.

However, simply mandating that electronics can only be recycled in the US may not be the most optimal solution. Electronic waste is a global issue, and restricting recycling to a single country disregards the fact that electronic products are manufactured and consumed worldwide. A more comprehensive approach to addressing electronic waste would involve international cooperation, strict regulations, and monitoring of recycling practices to ensure they meet environmental standards.

Efforts should focus on improving recycling practices globally, including promoting responsible electronic waste management, developing sustainable recycling infrastructure in multiple countries, and encouraging the adoption of safe and environmentally friendly recycling practices. This approach would foster global sustainability and address the challenges associated with electronic waste disposal more effectively than a geographically limited restriction.

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The correct answer is C. the reaction temperature will be maintained at approximately 100°C.

When a reaction mixture is heated at reflux, the temperature of the mixture will be maintained at the boiling point of the solvent.Reflux is a process that involves condensing vapours and transferring the resulting condensate back to the system it originally came from. It is employed in both commercial and academic distillations. Moreover, it is employed in chemistry to provide long-lasting reactions with energy. For example, if the reaction mixture is heated with water, the temperature will be kept at 100°C. Therefore, when heating a reaction mixture at reflux, the reaction temperature will be maintained at approximately 100°C.

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Sand was accidentally turned into glass by the Phoenician seafarers by the use of natron.

SiO2 is the primary component of flat glass (silica sand). This has a high melting point of around 1700 degrees Celsius, and in this form it resembles syrup on a very cold day.

Glass composed of borosilicate is a leader in general analytical applications due to its straightforward composition, excellent chemical resistance, and strong thermal shock capabilities. The advantages of borosilicate glass are all present in 96% silica glass, which also has outstanding thermal shock resistance and high service temperature characteristics.

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Molarity of the solution = 0.08 M

Molarity is a way to express the concentration of the solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

\(\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}\)

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

0.5 lb=226,796 g

MW silver nitrat - AgNO₃ = 169,87 g/mol

mol AgNO₃ :

\(\tt mol=\dfrac{mass}{MW}=\dfrac{226.796}{169.87}=1.335\)

Molarity :

\(\tt M=\dfrac{1.335}{16.75}=0.08\)

Answer:

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Answer:

conserve mass.

Explanation:

Iron (II) (Fe) oxidized, aluminium (Al) reduced. Hence, option D is correct.

An electrolytic cell converts electrical energy into chemical energy or vice versa.

Oxidation-reduction reactions are balanced by two half overall chemical equations into an oxidation equation and a reduction equation.

Iron (II) (Fe) oxidized, aluminium (Al) reduced of the following is an electrolytic cell.

Hence, option D is correct.

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The ideal gas equation gives the relation of the pressure and the volume of the gas with that of the moles and the temperature. Moles of oxygen in the lung are 0.026 moles.

The ideal gas equation states that moles of the substances are directly proportional to the pressure and volume but inversely to the temperature of the hypothetical gas.

The ideal gas equation can be given as,

\(\rm PV = nRT\)

Where,

Volume or the lung capacity (V) = 3.0 L

Pressure of the lungs (P) = 0.208 atm  

Gas constant (R) = 0.082057

Temperature of the air (T) = 295 K

Substituting values in the equation:

\(\begin{aligned}\rm n &= \rm \dfrac{PV}{RT}\\\\&= \dfrac{0.208 \times 3.0}{0.082057\times 295}\\\\&= 0.026 \;\rm moles\end{aligned}\)

Therefore, the number of the moles of the oxygen in lungs are 0.026 moles.

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Answer:

the answer is 0.21 g (B).

Explanation:

The answer is B, 0.21 g, because:

First, we need to calculate the initial concentration of calcium ions in the Ca(NO3)2 solution. To do this, we can use the formula:

moles of solute/volume of solution = concentration

We know that 100 mL of water was used to dissolve some Ca(NO3)2, but we don't know how many moles of Ca(NO3)2 were dissolved. Let's call this unknown quantity x.

So the initial concentration of calcium ions is:

moles of Ca2+/total volume of solution = x/(0.1 L) = (2x)/0.2 L = 10x M (since the solution is diluted to 0.2 L by adding 0.1 L of Na2SO4)

Next, we can use the Ksp expression for calcium sulfate:

Ksp = [Ca2+][SO42-]

We know that the Ksp value is 2.4 x 10^5 and the concentration of sulfate ions is 0.010 M (since 0.01 M Na2SO4 was added to the solution). We can use this information to calculate the concentration of calcium ions:

Ksp = [Ca2+][SO42-] = (x/(0.1 L))[0.010 M]

Solving for x, we get:

x = Ksp(0.1 L)/0.010 M = 2.4 x 10^5 (0.1 L)/0.010 M = 2.4 x 10^6 M

Finally, we can convert the concentration of calcium ions to the mass of Ca(NO3)2 dissolved in the initial solution:

mass = moles x molar mass = (10x M)(0.2 L)(164 g/mol) = 328x g

Substituting x = 2.4 x 10^6 M, we get:

mass = 328(2.4 x 10^6 g/mol) = 0.7872 x 10^9 g = 0.7872 g

Rounding to two significant figures, the answer is 0.21 g (B).

Graphite has a higher entropy than diamond, which is again a result of the dense crystal lattice of diamond. In comparison to the graphite structure, it is far more organized.

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The value of Avogadro's number is:

\(N = 6.02214076*10^{23}\)

So the correct option is the second one.

Avogadro's number represents the number of molecules in a mole.

The value of the Avogadro's number is such that the mass of one mole of a compound is numerically equal to the mass of that compound in daltons.

And, by definition, Avogadro's number is:

\(N = 6.02214076*10^{23}\)

With this in mind, we conclude that the correct option is the second one.

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Answer:

Explanation:

6.02x10^23

The wavelength of the emitted photon is approximately 2.44 μm.

The wavelength of the emitted photon can be determined using the Rydberg formula as follow

\(\frac{1}{\lambda}=R_H\left(\frac{1}{n_1^2}-\frac{1}{n_2^2}\right)\)

where: lambda is the wavelength of the emitted photon,

\(R_H=1.0974\times10^7\text{m}^{-1} ,$n_1=19 n_2=5 :\frac{1}\)

\({\lambda}=R_H\left(\frac{1}{19^2}-\frac{1}{5^2}\right) \frac{1}\\\\\\{lambda}=1.0974\times10^7\text{m}^{-1}\left(\frac{1}{361}-\frac{1}{25}\right) \frac{1}\\{\lambda}=1.0974\times10^7\text{m}^{-1}\left(0.002709-0.04\right) \frac{1}\\{\lambda}=1.0974\times10^7\text{m}^{-1}\times(-0.037291) \frac{1}{\lambda}=-409446.34\text{m}^{-1} \lambda=-\frac{1}{409446.34\text{m}^{-1}}=2.44\times10^{-6}\text{m}\)

Therefore, the wavelength of the emitted photon is approximately 2.44 μm.

Rounded to two decimal places, this value is equal to 2.45 μm. Thus, the correct option is A) 2.45μm.

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Wegener use fossils evidence to the shapes of the continents as evidence that the continents had moved.

Chemical fossils are substances that may be discovered in rocks and serve as an organic record of prehistoric life. Chemical fossils can be divided into two categories: molecular fossils and isotope ratios. Molecular fossils are products of biological biosynthesis that are absorbed into sediments and subsequently into rock. They are also known as biomarkers or biosignatures.

Numerous of these molecules undergo well-known modifications and can remain stable for billions of years. Chemical fossils are found in fossil fuels such as petroleum (crude oil), coal, and natural gas, which are products of biological activity. The majority of the plant material in major coal beds is from the Carboniferous epoch. Currently, more than 85% of the energy used in the United States comes from fossil fuels.

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Te, S, and c are the following sets of elements, and they will all produce ions with a charge of two (option b).

An essential element of a totality. In chemistry, a simple substance is one that cannot be divided into smaller components or transformed into another substance. An element's fundamental building block is an atom, which is made up of protons, neutrons, & electrons. The number of atoms in an element's protons is continuous.

Earth, Water, Wind, Fire, Ice, Thunder, Time, Flower, Shadow, Light, and Moon are the twelve natural elements. These simplified terminology for more advanced and complicated compounds refer to each of these elements.

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Answer:

0.040M

Explanation:

The following data were obtained from the question:

Volume of acid (Va) = 150mL

Volume of base (Vb) = 60mL

Molarity of base (Mb) = 0.1M

Molarity of acid (Ma) =..?

Next, the balanced equation for the reaction. This is given below:

HCl + NaOH —> NaCl + H2O

From the balanced equation above,

The mole ratio of the acid (nA) = 1

The mole ratio of the base (nB) = 1

Finally, we shall determine the concentration of the acid, HCl as follow:

MaVa / MbVb = nA/nB

Ma x 150 / 0.1 x 60 = 1/1

Cross multiply to express in linear form

Ma x 150 = 0.1 x 60

Divide both side by 150

Ma = 0.1 x 60 / 150

Ma = 0.04M

Therefore, the concentration of the acid is 0.04M

Answer:

0.040M

Explanation:

just took the review

Answer: How hydroelectric plant is better over thermal power plant in creating less pollution?

Explanation:

The thermal power plant utilizes the coal as a fuel. The heat energy so produce after burning coal is used for generating electrical energy. The burning of the coal results in the production of pollutants. The carbon dioxide is also a chief pollutant of coal burning. This can pollute the air.

The hydroelectric plant is better than thermal power plant in the sense no fuel is required for this purpose the energy from water currents are used for generating electrical energy.  

So, the citizens should research about hydroelectric plant and try to know how it is efficient in providing routine energy supply and impact it exerts on the environment if used as a source of energy generation.

Answer: A: Carbonic

Explanation: Quizlet confirmed

The simplest formula for a compound is made up of 1.677 grams of iron and 0.640 grams of oxygen would be FeO.

What the question is asking here is the empirical formula of an oxide of iron made up of 1.677 grams of iron and 0.640 grams of oxygen. The empirical formula shows the formula in the simplest whole-number ratio of the atoms.

Iron (Fe) = 1.677 grams

Oxygen (O) = 0.640 grams

Converting the masses to moles:

Fe = 1.677/56 = 0.0299 mol

O = 0.640/16 = 0.0400 mol

Now, let's divide by the smallest mole:

Fe = 0.0299/0.0299 = 1.0

O = 0.0400/0.0299 = 1.3

Thus, the empirical formula of the oxide of iron is FeO.

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Answer:

a double covalent bond

Explanation:

There are 5 mol of CaSO3 were left after the water was driven off.

The molar mass is the substance; it helps to determine the mass of the sample substance to the atom of the sample or substance. The molar mass depends on the molecular formula and the isotopes of the atom. Molar mass is used for the inducement of electric charge. Molar mass is the measurement of the volume of the mass.

A mole is the atom's elementary particle, an ion. The mole of the substance is always related to the Avogadro number. The mole is always associated with the weight or mass of the element or substance. The standard unit of a mole is mol. The mole is a significant factor of the reactant and products to form an equation. A mole calculates the atom, ion, and substance weighs.

Therefore,  are 5 mol of CaSO3 were left after the water was driven off.

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The answer is the phosphate concentration of \(8.40\times10^{-6}M\)

Calcium phosphate \($\left(\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}\right)$\) is dissociate to form

calciumion \($\left(\mathrm{Ca}^{2+}\right)$\) and phosphate ion \($\left(\mathrm{PO}_{4}^{3-}\right)$\).

\($\mathrm{Ca}_{2}\left(\mathrm{PO}_{4}\right)_{2}(\mathrm{~s}) \longrightarrow 3 \mathrm{Ca}^{2+}(\mathrm{aq})+2 \mathrm{PO}_{4}^{3-}(\mathrm{aq})$\)

Soluability product expression of \($\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}$\) is,

\($K_{s p}=\left[\mathrm{Ca}^{2+}\right]^{3} \times\left[\mathrm{PO}_{4}^{3-}\right]^{2} \longrightarrow (1)\)

given that, somability product \($\left(k_{s p}\right)=8.6 \times 10^{-19}$\)

concentration of \(\mathrm{ca}^{2+}$ ion $=0.0023 \mathrm{M}$\)

putting the value in equation (1) we get,

\($8.6 \times 10^{-19}=(0.0023)^{3} \times\left[\mathrm{PO}_{4}^{3-}\right]^{2}$\)

or, \($\left[\mathrm{PO}_{4}^{3-}\right]^{2}=\frac{8.6 \times 10^{-19}}{(0.0023)^{3}}=7.06 \times 10^{-11}$\)

or, \($\left[\mathrm{PO}_{4}^{3-}\right]=8.40 \times 10^{-6} \mathrm{M}$\)

So the phosphate concentration \($=8.40 \times 10^{-6} \mathrm{M}$\)

What is phosphate concentration ?

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The reaction performed with the elephant toothpaste demonstration is known as a decomposition reaction.

The process of breaking down a chemical compound into smaller molecules, atoms, or ions is known as a decomposition reaction. It is also known as analysis or disintegration. A reaction in which a single substance is broken down into two or more simpler substances is known as a decomposition reaction. The elephant toothpaste demonstration is a simple chemical reaction in which hydrogen peroxide breaks down into oxygen gas and water in a matter of seconds.

The formula for hydrogen peroxide is H₂O₂. It is a pale blue liquid that contains hydrogen, oxygen, and water. When you add yeast, soap, and food coloring, the reaction is more exciting. The yeast acts as a catalyst, breaking down hydrogen peroxide into water and oxygen gas. The oxygen gas created causes the soap to foam up, creating the "elephant toothpaste" effect. The chemical reaction that takes place during the elephant toothpaste demonstration can be written as follows:

2H₂O₂(liquid) → 2H₂O (liquid) + O₂ (gas)

This reaction is an example of a decomposition reaction.

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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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