Pressure: 101. 3 kPa → 1. 92 atm


Volume: ? L→ 8. 0 L


Assume constant temperature and number of moles.

A chemist determined by measurements that moles of calcium participated in a chemical reaction. The mass of calcium that participated in the chemical reaction is 0.40 g

Chemical reaction is define as a process that lead to chemical transformation of one set of chemical substance to another.

There are basically four types of chemical reaction.

Mass of calcium can be calculated as:

Molar mass of Ca = 40.0g/mole

Number of mole of Ca in chemical reaction = 0.010 moles

So ,

Mass = number of moles x molar mass

         = 0.010 moles x 40.0g/mole

         = 0.40 g

Thus, the mass of calcium that participated in the chemical reaction is 0.40 g

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Your question is incomplete, but probably your full question was

A chemist determined by measurements that 0.010 moles of calcium participated in a chemical reaction. calculate the mass of calcium that participated in the chemical reaction

Answer:

A variety of household products are hazardous. Motor oil, pesticides, oil-based paints, mothballs, flea collars, weed killers, and some household cleaners

The concentration of the new solution if 0.50 M solution of sodium thiosulfate is used to create a more dilute solution is 0.05M.

Molarity refers to the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

The concentration of a solution can be calculated using the following formula:

CaVa = CbVb

Where;

According to this question, if 250 mL of the concentrated solution is diluted to a volume of 2.5 L, the new concentration can be calculated as follows:

0.250 × 0.5 = 2.5 × Cb

0.125 = 2.5Cb

Cb = 0.05M

Therefore, 0.05M is the new concentration of the solution.

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At least 2,000 years ago, during the Roman era, pewter was used. The basic ingredients of old pewter were 70% tin and 30% lead. This form of pewter, also referred to as black metal, rapidly lost its lead when exposed to acidic foods.

Older pewters with a higher lead concentration are heavier, tarnish more quickly, and turn a darker shade of silver-grey with time. In 1974, BS5140, which was strengthened in 1994 by the European directive BSEN611, eliminated lead from the composition.

Modern pewter is lead-free and safe to use for eating and drinking, however older antique pewter objects may have lead residues.

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Answer:

Problem: The Ba3(PO4)2 (molar mass = 601.93 g/mol) precipitate that formed from a salt mixture has a mass of 0.667 g.

The molar mass of barium phosphate is 601.93 g/mol.

Molar mass is defined as the mass of a compound divided by the number of moles which is the amount of substance .It is a bulk quantity and not a molecular property of a substance . They are mostly calculated by adding the atomic masses of constituent elements in a compound.

It is an average of many particles or molecules.Molar mass is an intensive property as it does  not depend on size of the sample.It has units of kg/mol. Molar masses of elements is given by relative atomic mass of element whereas that of compounds is given by the sum of relative atomic mass multiplied by the molar mass constant.

They are never measured directly , they are measured from the standard atomic masses.

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There are 1.505 x 10²⁴ atoms of krypton in 2.50 mol of Kr gas.

To determine the number of atoms of krypton in 2.50 mol of Kr gas, we can use Avogadro's number, which states that 1 mole of any substance contains 6.022 x 10²³ particles (atoms, molecules, or ions).

Given that we have 2.50 mol of Kr gas, we can multiply this value by Avogadro's number to find the number of atoms:

Here is a step-by-step explanation of how to calculate the number of atoms of krypton in 2.50 mol of Kr gas using Avogadro's number:

Step 1: Recall the value of Avogadro's number, which is approximately 6.022 x 10²³ atoms/mol.

Step 2: Multiply the number of moles of Kr gas by Avogadro's number to find the number of atoms.

2.50 mol x (6.022 x 10²³ atoms/mol)

= 15.05 x 10²³ atoms (performing the multiplication)

Step 3: Express the result in standard form.

= 1.505 x 10²⁴ atoms (adjusting the decimal point)

Therefore, there are 1.505 x 10²⁴ atoms of krypton in 2.50 mol of Kr gas.

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According to the information of the graph we can infer that if the water were cooled to 5°C the reaction time would be close to 30 seconds.

To establish what would the reaction time be if the water were cooled to 5°C we have to analyze the information of the graph specially the trend. In this case, we have to take into account where are located the point that relate time and temperature.

In this case, the trend is more time with less temperature. So if the water were colled to 5°C, the time would be close to 30 seconds.

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Answer:

because the ions arent firmly held in place!

Explanation:

A. In this solution, water is the solvent and NaBr is the solute. The water molecules surround the Na+ and Br- ions, dissolving them and keeping them in a homogeneous mixture.

B. In this solution, both ethanol and water are solvents, and they are miscible. Ethanol molecules are surrounded by other ethanol molecules, and water molecules are surrounded by other water molecules. Therefore, each solvent dissolves in the other, and there is no clear distinction of solute and solvent.

C. In this solution, water is the solvent and AgNO3 is the solute. The water molecules surround the Ag+ and NO3- ions, dissolving them and keeping them in a homogeneous mixture.

A. In the solution containing 25.0 g of NaBr and 100.0 g of water, water is the solvent and NaBr is the solute. This is because water is present in greater quantity and serves as the medium in which the NaBr is dissolved.

B. In the solution containing 30.0 mL of ethanol and 20.0 mL of water, ethanol is the solute and water is the solvent. This is because water is present in greater quantity and serves as the medium in which the ethanol is dissolved.

C. In the solution containing 0.5 g of AgNO3 and 15 mL of water, water is the solvent and AgNO3 is the solute. This is because water is present in greater quantity and serves as the medium in which the AgNO3 is dissolved.

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Answer:

Carbon comes from the air and soil, hydrogen comes from absorbing water, H20, and breaking it down into Hydrogen and oxygen :) (also where oxygen comes from)

Explanation:

The color change of the equilibrium system of cobalt complexes can provide valuable information about changes made to the system at equilibrium. In this case, the Co(H₂0)₆²⁺ (aq) complex is pink and the CoCl₂⁻ (aq) complex is light blue.

If the solution changes from pink to light blue, it means that the concentration of CoCl₂⁻ (aq) complex has increased and the concentration of Co(H₂0)₆²⁺ (aq) complex has decreased. This could be due to the addition of more chloride ions or the removal of water molecules from the system. As a result, the equilibrium shifts towards the side of the equation with fewer chloride ions and more water molecules.

On the other hand, if the solution changes from light blue to pink, it means that the concentration of Co(H₂0)₆²⁺ (aq) complex has increased and the concentration of CoCl₂⁻ (aq) complex has decreased. This could be due to the addition of more water molecules or the removal of chloride ions from the system. As a result, the equilibrium shifts towards the side of the equation with fewer water molecules and more chloride ions.

If the solution stays light blue after adding a chemical, it means that the added chemical has no effect on the equilibrium system. This could be because the added chemical does not react with any of the species in the equilibrium system or because its effect is negligible compared to the existing concentrations of the species.

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If the experiment is repeated at the pH 11 level, the enzyme activity will be less than at the pH 9 level.

We can arrive at this answer because:

In this case, we can say that if the experiment is repeated at pH 11, the enzyme activity level will be even lower, since from pH 5 onwards, as the pH rises, the enzyme activity goes down.

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Answer:

Substance I is a neutral substance and substance II is a base.

Answer:

positive force → balanced force → negative force

Explanation:

np

Answer:

positive force → balanced force → negative force

Explanation:

:)))

Acetic acid is a weak acid present in commercial vinegar that can be used to create a buffer solution.

A buffer solution is a solution that can resist changes in pH when small amounts of acid or base are added to it. A buffer solution is made up of a weak acid and its corresponding conjugate base (or a weak base and its corresponding conjugate acid). Acetic acid is a weak acid that is present in commercial vinegar, and it can be used to create a buffer solution when combined with a salt of its conjugate base (such as sodium acetate).

Acetic acid has a pKa value of approximately 4.76, which means that it is a weak acid that does not dissociate completely in water. This property allows acetic acid to act as a buffer in a solution, helping to maintain a relatively constant pH even when small amounts of acid or base are added.

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For N2, 1 is the right whole number coefficient. N2 + 3H2 → 2NH3 is the balanced chemical reaction.

Equal numbers and types of each atom appear on both sides in case of balanced chemical equations, which is why they are called so. A balanced equation must have coefficients that are the simplest whole number ratio. For the chemical equation to adhere to the rule of conservation of mass, it must be balanced.

Equal numbers of atoms from various elements are present in both the reactants and the products in balanced chemical equations. Different elements' atom counts in the reactants and products of unbalanced chemical equations are varied.

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The change in energy for an electron within a hydrogen atom that undergoes a transition from an initial energy level with principal quantum number n₁ to a final energy level with principal quantum number n₂ is \(2.179872 * 10^{-18} J\).

The change in energy for an electron within a hydrogen atom that undergoes a transition from an initial energy level with principal quantum number n₁ to a final energy level with principal quantum number n₂ is given by the formula:

\(\Delta E = -Rhc[(\frac{1}{n_2^2}) - (\frac{1}{n_1^2})]\)

Where ΔE is the change in energy, R is the Rydberg constant \((1.0973731568508 * 10^7 m^{-1})\), h is the Planck constant \((6.62607015 * 10^{-34} J*s)\), and c is the speed of light \((2.99792458 * 10^8 m/s)\).

Plugging in the values for n₁ and n₂, we can calculate the change in energy:

\(\Delta E = -Rhc[\frac{1}{4} - \frac{1}{9} ]\)

\(\Delta E = -Rhc[(-\frac{5}{36} )]\)

\(\Delta E = (\frac{5}{36} )Rhc\)

\(\Delta E = (\frac{5}{36})*(1.0973731568508 * 10^7 )*(6.62607015 * 10^{-34})*(2.99792458 * 10^8)\)

\(\Delta E = 2.179872 * 10^{-18}\) J

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Answer:

Mole ratio is 1:1

Explanation:

The equation is:

PCl₃ +  Cl₂  →  PCl₅

We see that is correctly balanced.

1 mol of PCl₃ react to 1 mol of chlorine gas in order to produce 1 mol of PCl₅

That's why, the mole ratio is, 1:1

There is not another number than 1, at stoichiometry of reaction.

The correct ranking of compounds in order of increasing keq for this equilibrium is Acetone < Propanone < Benzaldehyde.

The correct ranking of compounds in order of increasing keq for the equilibrium of each of the carbonyl compounds with HCN to produce cyanohydrins is

Acetone < Propanone < Benzaldehyde.

In the above reaction, the cyanide ion acts as a nucleophile and attacks the carbonyl carbon atom in the carbonyl compound to form an intermediate compound. Then the intermediate compound formed by the reaction between HCN and the carbonyl compound undergoes an intramolecular rearrangement to form cyanohydrin.Based on the stability of intermediate compound formed, the order of increasing stability is as follows:

Acetone < Propanone < Benzaldehyde.

Since the keq is directly proportional to the stability of the intermediate, the order of increasing keq for the equilibrium of each of the carbonyl compounds with HCN to produce cyanohydrins is

Acetone < Propanone < Benzaldehyde.

The correct ranking of compounds in order of increasing keq for this equilibrium is

Acetone < Propanone < Benzaldehyde.

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Answer:

the earth is green because the green part is the plants and tree.

Answer:

The excess carbon dioxide in the atmosphere has created a greener planet,

Explanation:

Answer:

so the order is grass, which gets eaten by the grasshopper, which is eaten by the frog, which gets eaten by the snake. grass wpuld be at top, snake at bottom.

Explanation:

hope this helps

In an ecosystem, the first trophic level is for grass followed by , grasshopper,snake and  then frog.

An ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by  action of microbes nutrients are released back in to the soil.

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Answer:

it's sensitivity

Explanation:

because it's the action of sensing and reacting to something

also it was process of elimination

The boiling point of the solution is 136.5°C.

The boiling point of X: 134.5°C

Molal boiling point elevation constant (Kb): 1.36·°C·kg. mol⁻¹

We can calculate the elevation in the boiling point (ΔT) using the following expression.

ΔT = Kb × m

where,

m is the molality

The molar mass of urea is 60.06 g/mol. The moles of urea corresponding to 76 g are:

76 g × (1 mol/60.06g) = 1.3 mol

The mass of the solvent (X) is 850 g = 0.850 kg.

The molality is:

m = 1.3 mol / 0.850 kg = 1.5 mol/kg

Then,

ΔT = Kb × m

ΔT = 1.36·°C·kg.mol⁻¹ × 1.5 mol/kg

ΔT = 2.0 °C

The boiling point of the solution is

134.5°C + 2.0°C = 136.5°C

The boiling factor of a substance is the temperature at which the vapor pressure of a liquid equals the stress surrounding the liquid and the liquid adjustments into a vapor. The boiling point of a liquid varies relying on the encompassing environmental stress.

The boiling factor for any material is the temperature point at which the material transforms into the gas segment inside the liquid segment. This takes place at one hundred stages centigrade for water. The boiling point of a natural substance is the temperature at which the substance transitions from a liquid to the gaseous phase. At this factor, the vapor strain of the liquid is the same as the applied stress at the liquid. The boiling factor at a stress of 1 ecosystem is called the normal boiling factor.

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Complete Question:

A certain substance X has a normal boiling point of 134.5°C and a molal boiling point elevation constant =Kb1.36·°C·kgmol−1. Calculate the boiling point of a solution made of 76. g of urea NH22CO dissolved in 850. g of X . Be sure your answer has the correct number of significant digits.

The expression can be factored as (4h + 11)(4h + 11).

What exactly is an expression?

In chemistry, an expression is a basically statement or equation that describes the relationship between different chemical quantities. It usually involves mathematical operations and chemical symbols that represent elements and compounds. Expressions are used to describe chemical reactions, predict their outcomes, and develop new theories and models of chemical behavior.

This is because 4h + 11 can be written as (2h + 5)(2h + 5) and since 4h + 11 appears twice in the expression, we can factor it out of the entire expression.

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A chemical equation is a statement using chemical formulas that express both the identities and the relative quantity of the reactants and products involved in a chemical or physical change.

The chemical equation is said to be balanced if there are no inequalities.

The relative quantity is generally an absolute quantity divided by some other quantity. For example, in the previous excel file, one could calculate the percent of the adult population infected with HIV by dividing the number of adults with HIV by the total adult population of the country.

The main four types of reactions are direct combination, analysis reaction, single displacement, and double displacement.

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Answer:

lithosphere

Explanation:

Earth's interior layers are ordered by density. The densest layer is the solid metal inner core, the mantle is of intermediate density, and the least dense layer is the lithosphere, particularly the continental lithosphere.

The crust is the layer of the earth with the lowest density.

The crust is the rock layer that is the lightest and most buoyant on Earth. 41% of the Earth's surface is covered by continental crust, with a quarter of that covered by ocean floor. The thickness of the continental crust is 20 to 80 kilometers. Four billion years of Earth's history are stored in its rocks.

The crust is the outermost layer of the Earth, and it is only about 5-70 km deep. The mantle is the layer beneath the crust, which is about 2,900 km thick and has a thickness that varies. The core is divided into two sections: the inner core, which is solid, and the outer core, which is liquid. The Earth's surface is made up of several plates, which are continuously changing due to forces within the Earth.

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Answer:

Explanation:

The bond between any group 1 metal and a non-metal is always polar in nature as the resulting compound is always formed due to the transfer of electrons from the electron-donating site ie., metal to electron-accepting place non-metal. Due to such phenomena, there is a polarisation in the product.

For example, in NaCl, the Na (sodium) loses one electron to get positively charged which is accepted by Cl (chlorine) forming a negatively charged anion. thus creating polarity.