Help !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer: The coefficient is 3.645

The exponent is 1

There are 4 significant digits

The rightmost significant figure is 5

Explanation:

Scientific notation is defined as the representation of expressing the numbers that are too big or too small and are represented in the decimal form with one digit before the decimal point times 10 raise to the power.

For example : 5000 is written as \(5.0\times 10^3\)

According to avogadro's law, 1 mole of every gas contains avogadro's number \(6.023\times 10^{23}\) of particles, occupy 22.4 L at STP and weighs equal to its molecular mass.

131.29 g of Xe occupy = 22.4 L at STP.

Thus 213.62 g of \(Xe\) occupy = \(\frac{22.4}{131.29}\times 213.62=36.45L\) at STP.

Scientific notation = \(3.645\times 10^1L\)

The coefficient is 3.645

The exponent is 1

There are 4 significant digits

The rightmost significant figure is 5

A goal is defined as an objective or target that someone is trying to achieve. A goal is an aim or objective that you work hard toward with effort and determination. Here performative accomplish the goal.

Self-presentation refers to how people attempt to present themselves to control or shape how the audience view them. Acting or presenting oneself in a specific way so as to accomplish some goal is known as performative.

The performative utterances are sentences which not only describe a given reality, but also change the social reality they are describing.

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Answer:

the chemical composition of a substance.

Explanation:

The forces between molecules are much stronger than the forces between ions.

➜ True

The actual relative strengths will vary depending on the molecules involved. Ionic bonding and covalent bonding will always be stronger than intermolecular forces in any given substance.

Answer:

D

Explanation:

because the products are CACL2 AND I2 and both are solid

Answer:

4

Explanation:

If an electron shell can hold a maximum of 32 electrons the value of n = 4

Answer:

A.) Gravity pulls Neptune towards the sun.

Explanation:

Gravity is not the strongest force in nature, actually - it is quite weak in comparison to others.

But it is also the most important force in nature. Gravity is responsible for the formation of the solar system! The sun has more gravity than anything in our solar system! It keeps planets and other small bodies in a continous and elliptical orbit. The same applies to Neptune!

Also, did you know that the mass of the sun makes up 99.8% of ALL the mass in our solar system? That's pretty cool, right?

Answer:

The gasoline undergoes a change as it burns.

Explanation:

Just took the Unit Test review ((:

Answer:

b

Explanation:

because i said so brudda

The quality and safety of water can be determined using spectroscopic and techniques. Using components of interest (such iron and manganese) or by reacting the compound of interest with another compound to produce a color shift, a colorimeter assesses the intensity of a color.

It is typical to put the solution in a cuvette before reading a sample with a colorimeter. These are tiny, rectangular, often plastic containers that fit into the colorimeter's top slot. The spectrophotometer's cuvette should only contain distilled water when calibrating the device. So, distilled water is employed as a blank to exclude the absorbance of substances other than the analyte being measured. The method known as colorimetric analysis compares the color variations of the solution to estimate the concentration of analyte.

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Answer:a mouse

Explanation:

Answer: a mouse

Explanation:

The changes are classified as follows:

1: Chemical change -  The addition of the water to quicklime

2: Physical change - The melting of candle wax

3: Physical change -  The change in colour of zinc oxide from white to yellow and vice versa during heating and after cooling, respectively

4: Physical change- The dissolution of common salt

5: Chemical change - The hardening of cement by the absorption of carbon (Iv) oxide​

1: The addition of water to quicklime (slaking of lime) is a chemical change. It involves a chemical reaction between calcium oxide (quicklime) and water to form calcium hydroxide (slaked lime). This reaction is exothermic and produces heat.

2: The melting of candle wax is a physical change. It involves a phase transition from a solid state to a liquid state due to the application of heat. The chemical composition of the wax remains unchanged during this process.

3: The change in color of zinc oxide from white to yellow and vice versa during heating and cooling is a physical change. It is a reversible process caused by the alteration of the crystal structure of zinc oxide. The change in color is due to the absorption or release of energy during the heating and cooling processes, respectively.

4: The dissolution of common salt (sodium chloride) is a physical change. It involves the separation of ionic bonds between sodium and chloride ions in the solid salt and their subsequent dispersal in water. The chemical composition of the salt remains the same; it simply forms a homogeneous mixture with water.

5: The hardening of cement by the absorption of carbon dioxide (CO2) is a chemical change. It involves a chemical reaction known as carbonation, where carbon dioxide reacts with the calcium hydroxide in cement to form calcium carbonate. This reaction leads to the formation of new chemical compounds and a change in the structure and properties of the cement, resulting in its hardening or curing process.

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The minimum uncertainty in the energy of the excited state is approximately 0.206 eV.

According to the Heisenberg uncertainty principle, there is an inherent uncertainty in the measurement of certain pairs of physical properties, such as the position and momentum or the energy and time of a quantum system.

The uncertainty principle can be expressed mathematically as ΔE Δt ≥ ħ/2, where ΔE is the uncertainty in the energy of the system, Δt is the uncertainty in the time interval over which the energy is measured, and ħ is the reduced Planck constant.

In this case, the given time interval is Δt = 10^(-8) s. We can use this value to calculate the minimum uncertainty in the energy of the excited state:

ΔE Δt ≥ ħ/2

ΔE ≥ ħ/(2Δt)

ΔE ≥ (6.626 x 10⁻³⁴ J s)/(2 x 10⁻⁸ s)

ΔE ≥ 3.313 x 10⁻²⁶ J

To convert this energy uncertainty to eV, we can use the conversion factor 1 eV = 1.602 x 10⁻¹⁹ J:

ΔE = (3.313 x 10⁻²⁶ J) / (1.602 x 10⁻¹⁹ J/eV)

ΔE ≈ 0.206 eV

Therefore, the minimum uncertainty in the energy of the excited state is approximately 0.206 eV. This means that the energy of the excited state can fluctuate by up to this amount over the time interval Δt = 10⁻⁸ s.

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Explanation:

The major disadvantage of coal is its negative impact on the environment. Coal-burning energy plants are a major source of air pollution and greenhouse gas emissions. In addition to carbon monoxide and heavy metals like mercury, the use of coal releases sulfur dioxide, a harmful substance linked to acid rain.

Several principal emissions result from coal combustion: sulfur dioxide, which contributes to acid rain and respiratory illness.

The correct answer is :

a) The van der Waals forces are easily overcome and the molecule easily transitions into the gas phase when iodine crystals are heated. They dissolve into a dense cloud of purple colour.

London dispersion forces are another name for van der Waals forces.

Actually, the non-polar molecule is subject to these weak electrostatic forces. Or, to put it another way, since these are the only forces that interact with non-polar molecules, we can say that they are accountable for the neutral atom's existence.

The transitory or temporary dipoles produced in the non-polar elements are attracted to one another by these Van der Waals forces.

b) Iron nail (Ferrum) reacts with copper sulphate (CuSO 4) when it is dipped in it, changing the substance's colour from blue to pale green. This demonstrates that iron is more reactive than copper since it may take the place of copper in CuSO4.

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Answer:

yourmom.com

Explanation:

Ask your mom!!!!!!!

Answer:

when we drink the milk the digestive system produce protease enzyme to break down the protein of milk.

2.87 kg will be equal to 2870 grams, when converted using the metric system.

The metric system is a decimalized system of measurement used in many parts of the world. It is based on a decimal system, where the base unit of measurement is the gram. The metric system is the most common system of measurement used in the world today and is used in many scientific and medical applications.

It is based on the decimal system, where units of measurement are based off of a single base unit. It is also easy to convert from one unit of measurement to another, as the conversions are based on multiples of ten. This makes it easier to use and understand and is beneficial in many applications.

In order to convert 2.87 kg to grams, the following steps can be taken:

1. Multiply 2.87 kg by 1000, as there are 1000 grams in 1 kg.

2. 2.87 kg x 1000 = 2870 g

Therefore, 2.87 kg is equal to 2870 grams when using the metric system.

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Answer:

action-reaction force.

Explanation:

the pair of opposite but equal forces that two objects exert on each other. weight. the gravitational force exerted by a large body, usually Earth, on an object.

Answer:

exerted forces

Explanation:When an object has several forces acting on it, the effects of force is same as one force acting on the object in a certain direction and this overall force is called the ‘resultant force’.

Answer:

C) creating a relationship between mass and volume

g/L

g or gram is mass

L or Litres is for volume

The compounds formed in the Strecker synthesis from ketones or aldehydes are amino acids, and a Ramachandran plot can visualize the dihedral angles (phi and psi angles) that are formed between the peptide bonds in a protein structure.

In the Strecker synthesis, the compounds that can be formed from ketones or aldehydes are amino acids. Amino acids are organic compounds that contain an amino group (-NH2) and a carboxyl group (-COOH). They are the building blocks of proteins.

A Ramachandran plot, on the other hand, is a graphical representation used to visualize the dihedral angles that are formed between the peptide bonds in a protein structure. These angles are known as phi (Φ) and psi (Ψ) angles. Phi angle refers to the rotation around the alpha carbon (Cα) and the nitrogen (N) atoms, while psi angle refers to the rotation around the alpha carbon (Cα) and the carbon (C) atoms.

In a Ramachandran plot, the x-axis represents the phi angle, and the y-axis represents the psi angle. By plotting the phi and psi angles for each residue in a protein, a Ramachandran plot can provide insights into the overall conformation and stability of the protein structure.

To summarize, the compounds formed in the Strecker synthesis from ketones or aldehydes are amino acids, and a Ramachandran plot can visualize the dihedral angles (phi and psi angles) that are formed between the peptide bonds in a protein structure.

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2.8 × 10²⁶ moles Al

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[Given] 1.7 × 10⁵⁰ particles Al

[Solve] moles Al

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

2.82298 × 10²⁶ moles Al ≈ 2.8 × 10²⁶ moles Al

None of the given options is entirely correct.

With paper chromatography, mixtures of substances are separated according to how well they dissolve in a solvent and how well they stick to the paper's fibers.

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Answer:

molerat

Explanation:

Answer:

3.28 mol

Explanation:

2 mol FeCl3 forms from 2mol of FeCl2

therefore 3.28 mol of FeCl3 forms from=2/2×3.28 mol=3.28 mol

The molecules in a solid, liquid, and gas compare to each other with respect to their pattern and arrangement.

A change n a temperature directly relates respect to the alterations in the pressure inside a container.

Molecules may be defined as a cluster of atoms that are significantly bonded together in order to represent the smallest fundamental unit of a chemical compound that can take an active part during a chemical reaction.

The molecules in a solid ate tightly packed to one another generally in a regular pattern. The bonds tightly compacted the atoms of molecules in a solid state. While the molecules in a liquid are close to one another with no regular or systematic arrangement. The effectiveness of bonds is a little bit loose.

The molecules of gas are well separated with no regular arrangement. In this, the molecules are very loosely arranged with very weak bonds.

The significant increase in temperature leads to enhancement in the pressure as well. While the reduction in temperature also affects the pressure inside a container negatively.

Therefore, an alteration in a temperature directly relates respect to the alterations in the pressure inside a container.

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The estimated temperature of sublimation is approximately 343°C based on the given change in free energy at different temperatures.

The temperature at which a compound undergoes sublimation can be estimated by examining the change in free energy at different temperatures. In this case, the chemist found that the sublimation of the compound has a free energy change of -2.5 kJ at 350°C and a free energy change of 0.5 kJ at 140°C.

The change in free energy (∆G) is related to temperature (T) by the equation ∆G = ∆H - T∆S, where ∆H is the enthalpy change and ∆S is the entropy change.

To estimate the temperature of sublimation, we can set up two equations using the given information:

At 350°C: ∆G = -2.5 kJ = ∆H - 350∆S
At 140°C: ∆G = 0.5 kJ = ∆H - 140∆S

We can solve these equations simultaneously to find the values of ∆H and ∆S.

Subtracting the second equation from the first equation:
-3.0 kJ = -210∆S

Solving for ∆S:
∆S = 0.014 kJ/K

Substituting the value of ∆S into either equation, we can solve for ∆H.

Using the first equation:
-2.5 kJ = ∆H - 350(0.014 kJ/K)
-2.5 kJ = ∆H - 4.9 kJ

Solving for ∆H:
∆H = 2.4 kJ

Now that we have determined the values of ∆H and ∆S, we can estimate the temperature of sublimation using the equation ∆G = ∆H - T∆S.

Substituting the known values:
-2.5 kJ = 2.4 kJ - T(0.014 kJ/K)

Solving for T:
T ≈ 343°C

Therefore, a likely value for the temperature of sublimation is approximately 343°C.

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(b) false

It is not ok to pour it back in the bottle

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Answer:

2-methylpropanoic acid

Explanation:

no probs chief

Answer: To calculate the freezing point of an aqueous solution of NaCl, we need to use the formula for freezing point depression:

ΔTf = Kf·m

where ΔTf is the change in freezing point, Kf is the freezing point depression constant for water (which is given as 1.853 °C/m), and m is the molality of the solution (which is the number of moles of solute per kilogram of solvent).

We can use the formula to solve for the change in freezing point:

ΔTf = Kf·m

ΔTf = (1.853 °C/m)·(1.85 m)

ΔTf = 3.425 °C

This means that the freezing point of the solution is lowered by 3.425 °C compared to pure water. Since the freezing point of pure water is 0 °C, the freezing point of the solution can be calculated as:

Freezing point of solution = 0 °C - ΔTf

Freezing point of solution = 0 °C - 3.425 °C

Freezing point of solution = -3.425 °C

Therefore, the freezing point of an aqueous solution with a NaCl concentration of 1.85 m is approximately -3.425 °C.

Explanation:

The freezing point of an aqueous solution with an NaCl concentration of 1.85 m is -2.43 °C.

The freezing point depression of a solution can be calculated using the formula ΔT = Kfmi, where ΔT is the change in freezing point, Kf is the freezing point depression constant, m is the molality of the solution, and i is the van't Hoff factor, which represents the number of particles formed when the solute dissociates in the solvent.

For NaCl, i = 2 because it dissociates into two ions in water. Thus, ΔT = Kfmi = 1.853 °C/m * 1.85 m * 2 = 6.86 °C.

The freezing point depression is the change in the freezing point of the solvent relative to its pure form, so the freezing point of the solution can be calculated as the freezing point of water (0 °C) minus the freezing point depression (-6.86 °C):

Freezing point of the solution = 0 °C - 6.86 °C = -2.43 °C.

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