The final step in the scientific method is writing a(n) ___________.

Answer:

hydrogen

Explanation

a molecule of hydrogen is the simplest possible molecule . its consists of two protons and two electrons heid together by electrostatic forces. like atomic hydrogen the assemblage can exist in a number of energy levels

The temperature of the water in degrees Fahrenheit and kelvin are:

To convert the temperature of scalding water, 54 degrees Celsius, into degrees Fahrenheit, you can use the following formula:

F = (°C x 9/5) + 32

So:

(54 x 9/5) + 32 = 129.2 °F

To convert the temperature of scalding water, 54 degrees Celsius, into Kelvin, you can use the following formula:

°C + 273.15 = K

So,

54 + 273.15 = 327.15 K

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The amount of copper in moles in the 27.5 g pure copper sheet is approximately 0.433 moles.

To calculate the amount of copper in moles in a pure copper sheet, we need to use the molar mass of copper and the given mass of the sheet.

The molar mass of copper (Cu) is approximately 63.55 g/mol. This value represents the mass of one mole of copper atoms.

Given that the mass of the pure copper sheet is 27.5 g, we can calculate the number of moles using the following formula:

moles = mass / molar mass

Substituting the values:

moles = 27.5 g / 63.55 g/mol

moles ≈ 0.433 mol

Therefore, the amount of copper in moles in the 27.5 g pure copper sheet is approximately 0.433 moles.

To arrive at this result, we divided the given mass of the sheet (27.5 g) by the molar mass of copper (63.55 g/mol). This calculation allows us to convert the mass of the sheet into the corresponding number of moles of copper.

The result tells us that the 27.5 g pure copper sheet contains approximately 0.433 moles of copper atoms. This conversion to moles is useful in various chemical calculations and allows for easier comparison and analysis of quantities on a molecular scale.

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Answer:

Explanation:

This is due to multiple reasons. First of which, proper diet with a variety of selection of foods from vegetables, to dairy and meats can provide the body with essential nutrients used to fight off diseases and germs and improve the immune system. Exercise can also help boost the immune system and prevent diseases as well. It can also improve the condition of the heart which prevents heart disease and help the brain (prevent strokes). Drugs, smoking, alcohol and unsafe sexual activity can lead to a multitude of diseases, such as lung cancer, drug addictions, cardiac arrest, blood clots, HIV and other STDs, liver failure, etc. So it would be wise to abstain from those activities.

Answer:

Polyamides

(not entirely sure if this is right)

According to Le Chatelier's principle, the system will respond by shifting the reaction in the forward direction to counteract the increase in X:(g) concentration

Based on the given data, we can observe that the concentration of Xa(g) remains constant throughout the time intervals, while the concentration of Xus)* decreases. This implies that the rate of formation of Xa(g) is higher than the rate of formation of Xus)*.

To calculate the equilibrium constant (K) for the reaction, we can use the equation: K = ([Xa(g)]^2)/([Xus)*]^3. Using the data at equilibrium, we have K = (0.228^2)/(0.06^3) = 236.46.

When more X:(g) is added to the container, the amount of Xa(g) will increase. Therefore, the amount of Xa(g) will INCREASE.

This can be explained using Le Chatelier's principle. By adding more X:(g), the equilibrium of the reaction is disturbed. . As a result, more Xa(g) will be formed to establish a new equilibrium, leading to an increase in the amount of Xa(g).

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Answer:

electrons are combining with other electrons

Answer:80.8g

Explanation:

 = . / ()

The membrane is also slightly permeable to sodium ions explains the observation that a resting neuron membrane, while highly permeable to potassium ions.

The resting membrane potential, often known as the resting potential, is a voltage across the membrane of a resting (non-signaling) neuron.

Ion concentration gradients across the membrane and the permeability of the membrane to each kind of ion dictate the resting potential.

Na + and K+ concentration gradients exist across the membrane of a resting neuron. Ions flow via channels to descend their gradients, which causes a separation of charge to produce the resting potential.

The resting potential is somewhat near the equilibrium potential of K + because the membrane is substantially more permeable to K+ than to Na+.

Therefore, the membrane is also slightly permeable to sodium ions explains the observation that a resting neuron membrane, while highly permeable to potassium ions.

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The mass (in grams) of fluorine the sample have is 2.91 g

First, we shall determine the mole of 9 grams of cobalt. Details below:

Mole = mass / molar mass

Mole of cobalt = 9 / 58.93

Mole of cobalt = 0.153 mole

Finally, we shall determine the mass of fluorine the present in the compound. Details below:

Mole = mass / molar mass

0.153 = Mass of fluorine / 19

Cross multiply

Mass of fluorine = 0.153 × 19

Mass of fluorine = 2.91 g

Thus, the mass of fluorine is 2.91 g

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The change in enthalpy when 3 moles of methane react in excess oxygen is -2.67 × 10³ kJ (Option B).

Enthalpy (H) is a thermodynamic property that describes the total heat content of a system at a constant pressure. It is a measure of the energy that is transferred as heat during a chemical reaction or physical change at constant pressure.

Enthalpy is defined mathematically as:

H = U + PV

where U is the internal energy of the system, P is the pressure, and V is the volume. Enthalpy is often measured in units of Joules (J) or kilojoules (kJ).

The given reaction is:

CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l) ΔH = -890 kJ

This equation shows that when one mole of methane reacts with two moles of oxygen, it produces one mole of carbon dioxide and two moles of water while releasing 890 kJ of energy.

To determine the change in enthalpy when 3 moles of methane react in excess oxygen, we need to first calculate the amount of heat released when one mole of methane reacts with excess oxygen.

From the balanced chemical equation, we can see that 1 mole of CH4 releases 890 kJ of energy, so the energy released by 3 moles of CH4 would be 3 times that value:

Energy released by 3 moles of CH4 = 3 × (-890 kJ/mol) = -2670 kJ

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The change in enthalpy when 3 moles of methane react in excess oxygen is -2670 kJ.

What is Enthalpy?

Enthalpy is a thermodynamic property of a system that describes the heat content of the system at constant pressure. It is denoted by the symbol "H" and is expressed in units of joules (J) or kilojoules (kJ). Enthalpy is a state function, which means that it depends only on the initial and final states of the system, not on the path taken to reach those states.

The given reaction is: CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l), ΔH = −890 kJ

This reaction is for one mole of methane. To find the change in enthalpy when 3 moles of methane react, we need to multiply the enthalpy change by 3:

ΔH = 3 × (-890 kJ/mol) = -2670 kJ

Therefore, the change in enthalpy when 3 moles of methane react in excess oxygen is -2670 kJ.

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This problem is asking for the mass of anthracene one should use to decrease the melting point of a solution with 100.0 g of cyclohexane, and its freezing point depression constant, by 5.50 °C. At the end, the result turns out to be 4.81 g.

In chemistry, colligative properties are the result from mixing a solute and a solvent in order to modify the properties of the latter due to the addition of the former. Thus, freezing point depression, boiling point elevation, osmotic pressure and vapor pressure lowering are colligative properties one can go over.

In this case, we talk about freezing point depression, or even melting, because anthracene is added to cyclohexane to decrease its freezing, or melting, point by 5.50 °C. In such a way, we can calculate the mass of anthracene by firstly calculating the molality of the solution with:

\(\Delta T_f=-m*Kf\\\\m=\frac{-\Delta T_f}{Kf} \\\\m=\frac{-(-5.50\°C)}{20.4\°C/m}\\\\m=0.270mol/kg\)

Then, as 100.0 g of cyclohexane are equivalent to 0.1000 kg and, given the molar mass of anthracene, we can calculate the mass with the previous molality:

\(m_{anthracene}=0.270\frac{mol}{kg}*0.1000kg*\frac{178.23g}{1mol} \\\\m_{anthracene}=4.81g\)

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7.60grams

The formula for calculating the molarity of a solution is expressed as;

Given the following parameters

molarity of solution = 0.250M

volume of sample = 200mL

Substitute to determine the mole of the solute

Determine the required mass of FesO4

Hence the mass of FeSO4 is 7.60grams

The atoms have different types of bonds holding molecules together and leads to evaporation.

Thus, A crucial stage in the Earth's water cycle is evaporation, which is the process by which water transforms from a liquid to a gas or vapor. Evaporation at the molecular level requires the interface to break at least one extremely strong intermolecular connection between two water molecules.

The chemical mechanism by which an evaporating water molecule acquires sufficient energy to escape from the surface has remained mysterious despite the significance of this activity.

Here, we demonstrate that the high kinetic energy of the evaporated water molecule is enabled by a precisely timed formation and dissolution of hydrogen bonds involving at least three water molecules at the interface, the recoil of which allows one water molecule to escape.

Thus, The atoms have different types of bonds holding molecules together and leads to evaporation.

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Static equilibrium involves the sensation of linear acceleration as well as changes in head rotation is  False

A system is said to be in a condition of static equilibrium when all of its parts are at rest and there should be no net force operating on it.

Therefore, The macula is an oval-shaped region close to the retina's center. The layer that lines the back of the eye and is light-sensitive is called the retina. It is only 0.2 millimeters thick and has 200 million neurons.

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See full question below

Static equilibrium involves the sensation of linear acceleration as well as changes in head rotation.

T/F

Answer: 380 J. Please mark

Explanation:

The new volume assuming that the pressure and temperature remain constant is 0.46 L and the correct option is option 1.

The Ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behaviour of many gases under many conditions, although it has several limitations. The ideal gas equation can be written as-

                        PV = nRT

where,

P = Pressure

V = Volume

T = Temperature

n = number of moles

Given,

Initial volume = 1.5 L

Initial moles = 7.5 moles.

Moles remaining = 2.3 moles

\(\frac{n_{1} }{V_{1} } = \frac{n_{2} }{V_{2} }\)

\(\frac{7.5}{1.5 } = \frac{2.3}{V_{2} } }\)

V₂ = 0.46 L

Thus, the ideal selection is option 1.

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Jeremiah can arrange the materials in the following way to create a model that shows the processes by which water is cycled from a lake into the atmosphere and back to the lake

The following can be a representation of the water cycle;

Fill the glass jar with water to resemble the lake.

Put the lamp next to the jar to symbolize the sun.

Wrap the jar in plastic sheet to imitate the atmosphere.

Turn on the bulb to represent the sun warming the water.

When the water in the jar warms up and evaporates into water vapor, moisture will condense on the plastic wrap.

The water vapor will ascend and collect on the plastic wrap to represent the water vapor rising into the atmosphere.

Water vapor cools as it rises and condenses back into liquid form, as shown by the water droplets gathering on the plastic wrap.

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Answer:  There are

Explanation:

Before we can start, let us make sure that the given values are in the correct SI units.

V = 238 mL (divide by 1000 to get L) = 0.238 L

m= 0.425 g

P= 765 mmHg

T = 32 C ( C + 273 to get to kelvin) = 305 k

R = 8.314 J/mol = 62.4 mmL/molK

The question wants us to find the molar mass of the gas, we could use this equation n = m/M but we do not have the number of moles.

Lets find the number of moles first using the ideal gas law:

pV = nRT

n = pV/RT

n = (1.006 atm x 0.238 L)/(0.0825L.atm/mol.K x 305 K)

n = 9.515x10^-3 mol

Now we have the number of moles, lets find the molar mass.

n = m/M

Lets re-arrange:

M = m/n

M = 0.425 g/9.515x10^-3 mol

M = 44.66 g/mol

Based on the given data, the relationship between rate and concentration is exponential.

A proposed rate law for the reaction based on the given data is:

Collision theory suggests that the rate of a chemical reaction is proportional to the frequency and energy of collisions between the reactant molecules.

As the concentration of iodate ions decreases, the frequency of collisions between reactant molecules decreases, which leads to a decrease in the rate of the reaction.

At higher temperatures, the kinetic energy of the reactant molecules increases, which increases the frequency and energy of collisions between reactant molecules.

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Potash alum, represented by the chemical formula KAl(SO4)2·12H2O, is a double salt because it consists of two different salts, potassium sulfate (K2SO4) and aluminum sulfate (Al2(SO4)3), combined together. It forms a unique crystalline structure with 12 water molecules incorporated in its composition.

Potash alum is a type of alum that is commonly used in dyeing and water purification applications. The chemical formula for alum is KAl(SO4)2·12H2O.

The term "double salt" refers to the fact that the compound is made up of two different types of ions that are combined together.
In the case of potash alum, the two different types of ions are potassium ions (K+) and aluminum ions (Al3+). These two ions are combined together in a 1:1 ratio to form a complex ion, KAl(SO4)2, which is then combined with 12 water molecules to form the final compound, KAl(SO4)2·12H2O.
The term "double salt" is used to describe this type of compound because it contains two different types of cations (positive ions) that are combined together to form a single crystal lattice structure.

The two different cations are held together by ionic bonds, which are relatively strong and help to give the compound its characteristic properties.
Potash alum is a particularly useful compound because it has a number of important properties that make it useful in a variety of applications.

For example, it is highly soluble in water, which makes it a good choice for use in water purification applications.

It is also relatively stable and non-toxic, which makes it safe to use in a variety of different settings.

Finally, it has a number of useful physical properties, such as its ability to form crystals that are highly reflective and have a characteristic octahedral shape.

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Firstly what you need to know is that metallic bonds form in metallic substances. The elements that form these bonds are found on the left of the periodic table. So the metallic bonds form when the charge when the charge is spread over a wide distance when comparing to the size of the atom. These bonds occur between metals like zinc, and since they are in a form of solids, their atoms are tightly packed together.

The formation of metallic bonds occur because the metals exchange electrons, this electron exchange occur in different spatial directions.

Answer:

Matter changes to a plasma state

Explanation:

Plasma is superheated matter, so when matter is heated to the point that electrons are stripped off of atoms forming ionized gas.  Palsma comprises over 99% of the observable universe.  Plasma is visible in the form of stars, nebulas, and sometimes even auroras.

Answer:

C. Matter changes to a plasma state.

Explanation:

Correct on Edge 2022!!!

Good luck everyone, you got this! Have a great day!

Answer:

the answer is A

Explanation:

edg 2020

Answer:

the air above a wildfire/A

Explanation: