when solid calcium chloride is left uncovered, the mass of the sample gradually increases. explain why this might be happening

Answer:

D. Nuclei with small masses combine to form nuclei with larger masses.

B. A small amount of mass in the nuclei that combine is converted to energy

Explanation:

A nuclear fusion, in contrary to fission, is the process by which the nuclei of two atoms combine to form a much larger atom with a large nuclei. Likewise, during a fusion reaction, a large amount of energy is released from the small amount of mass in the nuclei (two) that combines.

According to this question, the following are true of a fusion reaction:

- Nuclei with small masses combine to form nuclei with larger masses.

- A small amount of mass in the nuclei that combine is converted to enormous energy.

Answer:

The concentration is 0.065g/mL

Explanation:

Given

\(m = 13g\) --- mass of salt

\(V =200mL\) --- volume of water

Required

Determine the concentration (C)

This is calculated as:

\(C = \frac{m}{V}\)

\(C = \frac{13g}{200mL}\)

\(C = \frac{13}{200}g/mL\)

\(C = 0.065g/mL\)

The concentration is 0.065g/mL

The percent yield for each compound:

a) For NaHCO3: 100%
b) For Na2CO3: 126.2%
c) For CO2: 100%
d) For H2O: 0%

To find the percent yield, we first need to determine the theoretical yield and actual yield for each compound. The theoretical yield is the amount of product that would be obtained if the reaction proceeded perfectly, while the actual yield is the amount of product obtained in reality.

Let's calculate the theoretical yield for each compound:

a) NaHCO3(s): Since 3.08 g of NaHCO3 is given, the theoretical yield of NaHCO3 would also be 3.08 g.

b) Na2CO3(s): The given problem states that 1.04 g of Na2CO3 is obtained. However, since Na2CO3 is formed from NaHCO3, we need to consider the molar mass ratio between NaHCO3 and Na2CO3. The molar mass of NaHCO3 is 84 g/mol, and the molar mass of Na2CO3 is 106 g/mol. Using this ratio, we can calculate the theoretical yield of Na2CO3:

(1.04 g Na2CO3) × (84 g NaHCO3 / 106 g Na2CO3) = 0.824 g NaHCO3

c) CO2(g): CO2 is produced during the decomposition of NaHCO3, and it is a gas. Therefore, we need to convert the mass of NaHCO3 to moles and then use the balanced chemical equation to find the moles of CO2 produced. The balanced equation for the decomposition of NaHCO3 is:

2 NaHCO3(s) -> Na2CO3(s) + CO2(g) + H2O(g)
The molar mass of NaHCO3 is 84 g/mol.

(3.08 g NaHCO3) / (84 g/mol NaHCO3) = 0.0367 mol NaHCO3
According to the balanced equation, 1 mole of NaHCO3 produces 1 mole of CO2. Therefore, the theoretical yield of CO2 is also 0.0367 mol.

d) H2O(g): Similarly, we can use the balanced equation to determine the theoretical yield of water. According to the equation, 1 mole of NaHCO3 produces 1 mole of H2O. Therefore, the theoretical yield of H2O is 0.0367 mol.

Now, let's calculate the percent yield for each compound:

Percent yield = (Actual yield / Theoretical yield) × 100

a) For NaHCO3:
Percent yield = (3.08 g / 3.08 g) × 100 = 100%

b) For Na2CO3:
Percent yield = (1.04 g / 0.824 g) × 100 = 126.2%

c) For CO2:
Percent yield = (0.0367 mol / 0.0367 mol) × 100 = 100%

d) For H2O:
Percent yield = (0 mol / 0.0367 mol) × 100 = 0%

To summarize, the percent yield for NaHCO3 is 100%, for Na2CO3 is 126.2%, for CO2 is 100%, and for H2O is 0%.

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Answer:

Lithium

Explanation:

it is the only metal listed.

To determine the mole ratio of hydrogen peroxide (H2O2) to permanganate ion (MnO4-) in the balanced chemical equation, the specific balanced equation needs to be provided. Without the equation, the mole ratio cannot be determined. The mole ratio represents the ratio of the coefficients of the species involved in a chemical reaction and is crucial for stoichiometric calculations.

The mole ratio is obtained from the coefficients of the balanced chemical equation. Each coefficient represents the number of moles of that particular species involved in the reaction. Without the balanced chemical equation mentioned in the question, it is not possible to determine the specific mole ratio between hydrogen peroxide and permanganate ion.

For example, in a balanced chemical equation:

a H2O2 + b MnO4- → c Mn2+ + d O2 + e H2O

The mole ratio between H2O2 and MnO4- would be a:b. However, since the balanced equation is not provided, the mole ratio cannot be determined accurately in this case.

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Answer:

Gas

Explanation:

If you move a substance from one container to another and its volume changes, the substance is a gas. This is because, gases do not have fixed volume and shape; their shape and volume depend on the container used.

Answer:

I think gas.

Explanation:

Because gas doesn't have fixed shape and size.

If a gas is cooled from 323.0 K to 273.15 K and the volume is kept constant, 0.77 atm is the final pressure, in atm, would result if the original pressure was 750.0 mmHg.

The force delivered perpendicularly to an object's surface per unit area across which the force is dispersed is known as pressure (symbol: p / P).[1]: 445  The pressure proportional to the surrounding air is known as gauge pressure, also spelt gauge pressure[a].

Pressure is expressed using a variety of units. Some of these are calculated by dividing a unit of force by a unit of area; for instance, the metric system's unit of pressure, a pascal (Pa), is equal to one newton every square metre (N/m2).

P₁/T₁  = P₂/T₂

P₂ = P₁T₂/T₁

  = 0.91 atm × 273.15 K / 323 K

  = 0.77 atm

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A redox reaction is a chemical reaction in which one or more of the reacting species undergoes oxidation and one or more undergoes reduction. An oxidizing agent is an element or compound that oxidizes another substance, while a reducing agent is an element or compound that reduces another substance.

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Answer:

hhmxui

Explanation:

The temperature of the gas is approximately 374 K.

The temperature of a gas can be calculated using the formula \(PV = nRT\),

where \(P\) represents the pressure of the gas in atm,

\(V\) represents the volume of the gas in L (converted from mL by dividing by 1000),

\(n\) represents the number of moles of the gas,

\(R\) is the universal gas constant (0.0821 L·atm/mol·K), and

\(T\) represents the temperature of the gas in Kelvin.

Rearranging the equation, we have \(T = \frac{PV}{nR}\).

\(P = 2.21\) atm

\(V = 6.850\) mL = \(6.85\) L

\(n = 0.750\) mol

\(R = 0.0821\) L·atm/mol·K

Substituting the given values into the equation, we get:

\(T = \frac{(2.21 \, \text{atm}) \times (6.85 \, \text{L})}{(0.750 \, \text{mol}) \times (0.0821 \, \text{L·atm/mol·K})}\)

Calculating the expression, we find:

\(T \approx 374 \, \text{K}\)

Therefore, the temperature of the gas is approximately 374 K.

This calculation demonstrates the relationship between the pressure, volume, temperature, and amount of gas using the ideal gas law equation.

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The number of moles in 0.0250 g of NaCO₃ is calculated by dividing the given mass by the molar mass of NaCO₃.

The molar mass of NaCO₃ is the sum of the atomic masses of its constituent elements: sodium (Na), carbon (C), and oxygen (O). The atomic masses of these elements are 22.99 g/mol, 12.01 g/mol, and 16.00 g/mol, respectively. By adding these values together, we find that the molar mass of NaCO₃ is 105.99 g/mol.

\(\[ \text{{moles}} = \frac{{\text{{mass (g)}}}}{{\text{{molar mass (g/mol)}}}} \]\).

First, we need to determine the molar mass of NaCO₃. The molar mass of sodium (Na) is 22.99 g/mol, carbon (C) is 12.01 g/mol, and oxygen (O) is 16.00 g/mol. Since NaCO₃ contains one sodium atom, one carbon atom, and three oxygen atoms, the molar mass of NaCO₃ is:

\(\[ \text{{Molar mass of NaCO3}} = 22.99 \, \text{{g/mol}} + 12.01 \, \text{{g/mol}} + (16.00 \, \text{{g/mol}} \times 3) = 105.99 \, \text{{g/mol}} \]\)

Now, we can substitute the values into the formula:

\(\[ \text{{moles}} = \frac{{0.0250 \, \text{{g}}}}{{105.99 \, \text{{g/mol}}}} = 0.000235 \, \text{{mol}} \]\)

Therefore, 0.0250 g of NaCO₃is equal to 0.000235 moles of NaCO₃.

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Answer:

It is a Physical change, have a great day :)

Explanation:

A chemical change is a permanent change. A Physical change affects only physical properties i.e. shape, size, etc. ... Some examples of physical change are freezing of water, melting of wax, boiling of water, etc. A few examples of chemical change are digestion of food, burning of coal, rusting, etc.

The set of resonance structures that best describes the bonding in the nitrite ion (NO₂⁻) is a combination of three structures.

The nitrite ion (NO₂⁻) consists of a central nitrogen atom bonded to two oxygen atoms. The bonding in the nitrite ion can be described using resonance structures to show the delocalization of electrons.

In the first resonance structure, nitrogen forms a double bond with one oxygen atom and has a lone pair of electrons. The other oxygen atom carries a negative charge.

In the second resonance structure, the double bond shifts to the other oxygen atom, while the negative charge moves to the nitrogen atom.

The third resonance structure involves a full negative charge on the oxygen atom that initially had the double bond, with the nitrogen atom bearing a positive charge.

The actual bonding in the nitrite ion is a combination, or hybrid, of these resonance structures. This delocalization of electrons results in the formation of a more stable ion.

Overall, the resonance structures illustrate the presence of multiple bonds and the movement of electrons within the nitrite ion, contributing to its stability and reactivity in the eutrophic zone of the ocean.

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Answer:

0.72 moles of hydrochloric acid are needed to completely react with 0.36 mol of lead.

Explanation:

The balanced  reaction is:

Pb + 2 HCl → PbCl₂ + H₂

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of reagent participate:

You can apply the following rule of three: if by stoichiometry of the reaction 1 mole of Pb reacts with 2 moles of HCl, 0.36 moles of Pb will react with how many moles of HCl?

\(amount of moles of HCl=\frac{0.36 molesof PB*2 moles of HCl}{1 mole of Pb}\)

amount of moles of HCl= 0.72 moles

0.72 moles of hydrochloric acid are needed to completely react with 0.36 mol of lead.

The moles of HCl needed to completely react with 0.36 mole of lead is 0.72 moles.

Stoichiometry of the reaction tells about the relative amount of the reactants and products present in that reaction in terms of coefficient.

Given chemical reaction is:

Pb + 2HCl → PbCl₂ + H₂

From the stoichiometry of the reaction, it is clear that:
1 mole of Pb = react with 2 moles of HCl

0.36 mole of Pb = react with 2×0.36 = 0.72 moles of HCl

Hence, the required moles of HCl is 0.72 moles.

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Answer:

True

Explanation:

Answer:

True

Explanation:

Most people stick to what they know and don't look for a laughing place.

Answer:

Explanation:

The percentage error of a certain measurement can be found by using the formula

\(P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ \)

From the question

actual density = 0.70 g/mL

error = 0.8 - 0.7 = 0.1

So we have

\(P(\%) = \frac{0.1}{0.7} \times 100 \\ = 14.285714...\)

We have the final answer as

Hope this helps you

The methods of simulating general aerofoil shape include experimental techniques such as wind tunnel testing, and numerical techniques such as Computational Fluid Dynamics (CFD) simulations.

Simulating general aerofoil shapes involves both experimental and numerical techniques. Experimental methods include wind tunnel testing, where scaled-down models of the aerofoil are tested in controlled airflow to measure aerodynamic forces. Numerical techniques, such as Computational Fluid Dynamics (CFD) simulations, involve solving fluid flow equations on a computer to analyze flow characteristics and aerodynamic forces. CFD simulations are cost-effective, flexible, and can handle complex aerofoil shapes, but require accurate modeling and validation. A combination of experimental and numerical methods enhances our understanding of aerofoil aerodynamics and helps optimize their design.

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A usual type of controlled experiment balance a control group against an experimental group.

The parts of the experimental design are control, free variable, dependent variable, constant variable, randomly assignment, and manipulation. These are the components is also help you explain if the experiment is valid. A controlled experiment is an experiment that set side by side the effect of one manipulated variable on a group that collects no treatment. controlled variables. the element that should be kept matching in both the nursing group and the non-treated group. True experiments have four elements: artifices, control, random or assignment, and random selection. The main of these elements is manipulation and control. Manipulation means that something is purposefully changed by scientists and the environment.

so we can conclude A common type of controlled experiment compares a control group against an experimental group.

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when hydrogen peroxide mixed with vinegar makes peracetic which is potentially toxic and irritate skin, eyes and respiratory system.

The given reaction is the calcium carbide reaction of calcium hydroxide with water to produce acetylene.

The balanced equation is CaC2+2H2OCa(OH)2+C2H2.

Molar mass of acetylene, C2H2 = 2x12+2x1 = 26 g/mol

we get 64 g of CaC2 becomes 26 g of C2H2. 5.0g CaC2..

Molecular weight of Ca(OH)2=1(atomic weight of Ca)+2(atomic weight of O)+2(atomic weight of H)=40+2(16)+2(1)=40+32+2=74.

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Explanation:

[Ne] 3s² 3p⁵

Image result for What is the electron configuration of chlorine?

Atomic number: 17

Symbol: Cl

People also search for

Argon

The correct answer is A. Based on the given options, amino acids can be classified into different categories based on the properties of their R groups.

it are organic compounds serve as the building blocks of proteins. They consist of a central carbon atom (alpha carbon) bonded to an amino group (-NH2), a carboxyl group (-COOH), a hydrogen atom, and an R group (side chain) that varies among different amino acids.

classified R groups amino acids. The given options represent different classifications:

A. Hydrophobic amino acids with nonpolar R groups: These amino acids have R groups that are nonpolar and do not readily interact with water molecules. They tend to be hydrophobic (water-fearing) and are often found in the interior of proteins away from water.

B. Polar amino acids with neutral R groups but the charge is not evenly distributed: These amino acids have polar R groups that contain functional groups such as hydroxyl (-OH) or amine (-NH2). Although they are polar, the charge is not evenly distributed within the R group.

C. Positively charged amino acids with R groups that have positive charge at physiological pH: These amino acids have R groups that contain positively charged functional groups, such as amino groups (-NH3+), at physiological pH (around 7.4).

D. Negatively charged amino acids with R groups that have a negative charge at physiological pH: These amino acids have R groups that contain negatively charged functional groups, such as carboxylate groups (-COO-), at physiological pH.

Based on the given options, amino acids can be classified into different categories based on the properties of their R groups. Amino acids with hydrophobic nonpolar R groups are classified as hydrophobic amino acids.

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Answer: Your answer is Chemical weathering.

Hope this helps!

Answer:

chemical

Explanation:

I hope it help.........

Answer:

1) Liquid forms drops that are dome-shaped

2) low surface tension

3) low viscosity

4) Liquid is thick and pours very slowly

Explanation:

It makes sense just use the stuff that's already in the table. It usually works.

Answer: 1.86 L of oxygen is required to completely combust 0.452 L of propane at STP.

The bonds when surface tension occurs, water molecules form a weak bond with each other allowing a small bug to walk across the surface of a puddle. are referred to as hydrogen bonds.

Surface tension is the energy, often denoted as γ, necessary to increase the surface area of a liquid by a unit of area. Surface tension is a result of the cohesive forces that arise between the liquid's atoms and molecules. It's a property of liquids that makes them behave like an elastic sheet or membrane on their surface.

Hydrogen bonds are a type of chemical bond that occurs between a hydrogen atom bonded to an atom such as oxygen, nitrogen, or fluorine and another atom or electronegative group in a different molecule or chemical group.

The hydrogen bond is a type of dipole-dipole interaction that occurs when an electronegative atom or molecule attracts the positively charged hydrogen atom of another molecule or group. The hydrogen bond is a result of the difference in electronegativity between the hydrogen and the electronegative atom or group.

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Exothermic Reaction produces heat. The change in enthalpy, ΔH, for an exothermic reaction will always be negative.

Because the total energy of the products is lower than the total energy of the reactants, an exothermic reaction releases energy. A reaction for which the overall standard Gibbs energy change ΔG⚬ is negative. A chemical system's energy is essentially represented by its enthalpy. The heat q that is moved out of (or into) a closed system at constant pressure without any electrical energy input or output is equivalent to the enthalpy change (H) for that reaction. Using calorimetry, such as with a bomb calorimeter, one may determine how much heat is produced or absorbed during a chemical reaction. Reaction calorimeters are frequently used laboratory instruments for measuring heat transfer into or out of reaction vessels. A combustion reaction's heat release and associated energy change, H, can be measured very precisely.

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Answer:

1. Cerium

2. Iodine

3. Potassium

4. Lead

5. Boron

6. Calcium

7. Krypton

8. Einsteinium

Explanation:

Hope it helped!

Answer:

C

Explanation: