do all atoms only have one oxidation state​

The efficiency : 95%

Efficiency : the ratio between output and input work

In general, the value of the output of a machine is less than the value of the input because of the frictional force in the machine.

The greater the efficiency of the engine, the better the machine

Can be formulated :

\(\tt E=\dfrac{W_{out}}{W_{in}}\times 100\%\)

w output = 190 J

W input = 200 J

The efficiency :

\(\tt E=\dfrac{190}{200}\times 100\%=95\%\)

Answer:

His kinetic energy is converted into potential energy.

Explanation:

Answer:   This is an acid-base reaction (neutralization): Al(OH) 3 is a base, HBr is an acid. ; Colorless gas with a sharp, irritating odor.

...

Search by products (AlBr 3, H 2O)

1 HBr + Al(OH)3 → H2O + AlBr3

2 Al2O3 + HBr → H2O + AlBr3

Explanation:

Answer:

Both switches must be closed in order for the circuit to be complete and for the bulb to light. (This would indicate the 'armed' status of this burglar alarm.) Magnetic switches come in 2 varieties - "Normally Closed" and "Normally Open". These 2 terms describe the state of the switch when it is NOT being controlled by the magnet.

Explanation:

Answer:

curium

−

243

,

252

/

99

Es,  

251

/

98

Cf,  

214

/

82

Pb

Explanation: Im not very good with this but here ya go!

Answer:

very strong

Explanation:

acid rain ph = 4.3 to 4.5 .

that much strong

Answer:

solubility- the degree to which a material will dissolve in another substance

mixture- different materials placed together but keeping their own properties

solution- a mixture in which substances are spread out evenly and will not settle

Answer: An electron con only exist in a limited number of quantized energy levels.

Explanation:

The outermost of the six sun layers with the letters A, B, C, D, E, and F, layer F in the cross-sectional figure symbolises the corona.

The Sun's atmosphere's outermost region is called the corona. The brilliant brightness of the Sun's surface often obscures the corona. Without employing specialised equipment, it is challenging to see. A total solar eclipse, however, makes the corona visible.

The term "corona" refers to the topmost region of the Sun's atmosphere. It rises hundreds of kilometres above the Sun's surface and gradually changes into the solar wind, which travels across our solar system.

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Long-term (months or years) high blood sugar levels can cause irreversible harm to organs such the kidneys, blood vessels, eyes, nerves, and nervous system. Speak with your doctor or the diabetes care team if you frequently have hyperglycemia.

If left untreated, having excessive blood sugar levels for an extended length of time might lead to major health issues. In addition to raising the risk of heart disease, stroke, kidney illness, vision issues, and nerve issues, hyperglycemia can harm the blood arteries that provide blood to essential organs.

A high-fat, high-calorie, and high-cholesterol diet

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Answer:

A logic bomb and a time bomb are both types of malicious software or code that are designed to cause harm to a computer system or network. Here's a brief explanation of each:

Logic Bomb:

A logic bomb is a piece of code or software that is intentionally inserted into a system to execute a malicious action when specific conditions are met. It remains dormant until triggered by a predefined event or circumstance, such as a specific date, time, or user action. Once triggered, the logic bomb may perform various harmful actions, such as deleting files, corrupting data, or disrupting system functionality. The purpose of a logic bomb is often to cause damage or to gain unauthorized access to a system.

Time Bomb:

A time bomb is similar to a logic bomb, but it is specifically designed to activate or execute its malicious payload at a certain date or time. It is usually programmed to remain undetected until the predetermined time arrives. The time bomb can be set to trigger after a specific time period or on a particular date, at which point it may carry out destructive actions. Time bombs can be used by attackers to target specific events or to coordinate an attack to occur simultaneously across multiple systems.

Both logic bombs and time bombs are considered forms of malicious code or malware and are used with malicious intent to disrupt, damage, or compromise computer systems or networks. They can be extremely harmful, and it is important to have strong security measures, such as antivirus software and regular system updates, to protect against such threats.

Explanation:

Given that,

Draw the Lewis structure of acetaldehyde (CH₃CHO).

We know that,

The Lewis structure shows the number of electrons around an atom.

According to structure,

We need to find the molecular geometries of the two central atoms

Using molecular geometries

For first central atom,

Number of bond pair = 2

Here, double bond to O count as single bond

The number of lone pair is zero.

The geometry is Trigonal planar.

For second central atom,

Number of bond pair = 4

The number of lone pair is zero.

The geometry is tetrahedral

Hence, The molecular geometries of the two central atoms are trigonal planar and tetrahedral.

(d) is correct option.

The central carbon atoms in acetaldehyde have a tetrahedral geometry and a trigonal planar geometry respectively.

Acetaldehyde has two central carbon atoms. The Lewis structure of acetaldehyde shows the arrangement of electrons around the atoms in the compound. The lone pairs are shown as dots while the bond pairs are represented using a single dash.

The first central carbon atom in acetaldehyde has a tetrahedral geometry while the second central carbon atom in acetaldehyde has a trigonal planar geometry.

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Answer:

hi the answer is b [OH-] = 8.6x10 11M

Explanation:

Answer:

B

Explanation:

iTS just B

There are approximately 0.16 moles of gas present in the lungs.

To solve this problem, we can use the ideal gas law, which relates the pressure (P), volume (V), number of moles (n), and temperature (T) of a gas:

PV = nRT

where R is the gas constant.

First, we need to convert the temperature to Kelvin:

T = 37°C + 273.15 = 310.15 K

Next, we can plug in the given values:

P = 1.0 atm

V = 4.0 L

T = 310.15 K

We also need to find the value of R, which depends on the units we are using for pressure, volume, and temperature. In this case, we are using atmospheres, liters, and Kelvin, so we can use the value:

R = 0.08206 L·atm/K·mol

Now we can rearrange the ideal gas law to solve for the number of moles:

n = PV/RT

n = (1.0 atm)(4.0 L)/(0.08206 L·atm/K·mol)(310.15 K)

n = 0.1638 mol

Therefore, there are approximately 0.16 moles of gas present in the lungs.

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The properties of a natural resource that make it useful for humans as a material or energy source is the ability to convert mass into energy and vice versa.

The expression natural resources make reference to all types of matter and energy extracted from nature that can be used to produce goods and services.

Some examples of natural resources include for example irreversible resources such as fossil fuels (i.e., oil, or coal, gas, minerals such as metals, rocks, etc) as well as those based on the use of reversible energy such as eolic air energy, solar radiation or sunlight, soil and hydric resources or water.

Therefore, with this data, we can see that natural resources can be defined as any material and or energy obtained from nature that may be irreversible or reversibly used to produce goods and services.

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Answer:

\(P=3.33atm\)

Explanation:

Hello!

In this case, since know the volume, temperature and pressure of the initial containers, we can compute the moles of each gas prior to the opening of the valve as shown below:

\(n_{Ne}=\frac{6atm*4L}{0.08206\frac{atm*L}{mol*K}*298.15K} =0.981molNe\\\\n_{Ar}=\frac{2atm*8L}{0.08206\frac{atm*L}{mol*K}*298.15K} =0.654molAr\)

Next, we add them up to obtain the total moles:

\(n_T=0.981mol+0.654mol=1.635mol\)

Now, the total volume:

\(V_T=4.00L+8.00L=12.00L\)

Finally, the total pressure is computed by using the ideal gas equation:

\(P=\frac{1.635mol*0.08206\frac{atm*L}{mol*K}*298.15K}{12.00L}\\\\P=3.33atm\)

Best regards!

Answer:

The 3rd answer down.

Na²O (sodium oxide) will be a base when exposed to water H²O

Explanation:

Sodium Oxide Na²O, will become Sodium Hydroxide after being exposed to water (at 80% I believe).

The oxygen ion in Na²O has 2 extra electrons which makes it highly charged and very attractive to hydrogen ions. The attraction is so strong that when Na²O comes in contact with H²O, the O(-2) strips off a hydrogen from water, forming 2 x OH ions which of course are still strongly basic.

The sentence best summarizes the law of conservation of mass is a) The total amount of mass does not change during a chemical reaction.

The law of conservation of mass states that in a chemical reaction the mass neither be created nor be destroyed.

for example :

CH₄   +    2O₂    ----->    CO₂   +   2H₂O

the mass of reactants is = 16 g + 64 g = 80 g

the mass of products is = 44 g + 36 g = 80 g

it is clear from the above that :

The mass of reactants = The mass of Products

Thus , The sentence best summarizes the law of conservation of mass is a) The total amount of mass does not change during a chemical reaction.

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The mass of gasoline in the full tank is 68.99 kilograms. Gasoline is a highly flammable and volatile liquid that can easily ignite if exposed to heat or a spark.

What is Gasoline?

Gasoline, also known as petrol, is a transparent, petroleum-derived liquid that is primarily used as a fuel in internal combustion engines. It is a mixture of hydrocarbons, typically containing 5 to 12 carbon atoms per molecule. Gasoline is refined from crude oil through a process of distillation, whereby the crude oil is heated and separated into its different components based on their boiling points.

First, we need to convert the volume of gasoline from gallons to milliliters:

1 gallon = 3.78541 liters

1 liter = 1000 milliliters

Therefore:

22.3 gallons x 3.78541 liters/gallon x 1000 milliliters/liter = 84,161.83 milliliters

Next, we can use the density of gasoline to find the mass of the gasoline:

0.8206 g/mL x 84,161.83 mL = 68,986.87 grams

68,986.87 grams / 1000 grams per kilogram = 68.99 kilograms (rounded to two decimal places)

Therefore, the mass of gasoline in the full tank is 68.99 kilograms.

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Answer : 69.3 kg

Explanation:

Answer:

The sun's position near earth

Explanation:

After the reaction is complete, no nitrogen and no hydrogen molecules remain, and 8.00 x 1014 molecules of NH3 are produced.

In the equation, nitrogen and hydrogen react at a high temperature, in the presence of a catalyst, to produce ammonia, according to the balanced chemical equation:N2(g)+3H2(g)⟶2NH3(g)The coefficients of each molecule suggest that one molecule of nitrogen reacts with three molecules of hydrogen to create two molecules of ammonia.

So, to determine how many molecules of ammonia are produced when four nitrogen and nine hydrogen molecules are present, we must first determine which of the two reactants is the limiting reactant.

To find the limiting reactant, the number of moles of each reactant present in the equation must be determined.

Calculations:
Nitrogen (N2) molecules = 4Hence, the number of moles of N2 = 4/6.02 x 1023 mol-1 = 6.64 x 10-24 mol
Hydrogen (H2) molecules = 9Hence, the number of moles of H2 = 9/6.02 x 1023 mol-1 = 1.50 x 10-23 mol

Now we have to calculate the number of moles of NH3 produced when the number of moles of nitrogen and hydrogen are known, i.e., mole ratio of N2 and H2 is 1:3.

The mole ratio of N2 to NH3 is 1:2; thus, for every 1 mole of N2 consumed, 2 moles of NH3 are produced.
The mole ratio of H2 to NH3 is 3:2; thus, for every 3 moles of H2 consumed, 2 moles of NH3 are produced.
From these mole ratios, it can be observed that the limiting reactant is nitrogen.

Calculation for NH3 production:
Nitrogen (N2) moles = 6.64 x 10-24 moles
The mole ratio of N2 to NH3 is 1:2; therefore, moles of NH3 produced is 2 × 6.64 × 10−24 = 1.33 × 10−23 moles.

Now, to determine how many molecules of NH3 are produced, we need to convert moles to molecules.
1 mole = 6.02 x 1023 molecules
Thus, 1.33 x 10-23 moles of NH3 = 8.00 x 1014 molecules of NH3 produced.

To find the amount of each reactant remaining after the reaction is complete, we must first determine how many moles of nitrogen are consumed, then how many moles of hydrogen are consumed, and then subtract these from the initial number of moles of each reactant.

The moles of nitrogen consumed = 4 moles × 1 mole/1 mole N2 × 2 mole NH3/1 mole N2 = 8 moles NH3
The moles of hydrogen consumed = 9 moles × 2 mole NH3/3 mole H2 × 2 mole NH3/1 mole N2 = 4 moles NH3
Thus, the moles of nitrogen remaining = 6.64 × 10−24 mol – 8 × 2/3 × 6.02 × 10^23 mol-1 = 5.06 × 10−24 mol
The moles of hydrogen remaining = 1.50 × 10−23 mol – 4 × 2/3 × 6.02 × 10^23 mol-1 = 8.77 × 10−24 mol

Finally, the number of molecules of each reactant remaining can be calculated as follows:
Number of N2 molecules remaining = 5.06 × 10−24 mol × 6.02 × 10^23 molecules/mol = 3.05 × 10−1 molecules ≈ 0 molecules
Number of H2 molecules remaining = 8.77 × 10−24 mol × 6.02 × 10^23 molecules/mol = 5.28 × 10−1 molecules ≈ 0 molecules.

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Chlorofluorocarbons (CFCs) are man-made chemicals containing chlorine and fluorine that cause ozone molecules to break down. Thus, option B is the answer.

Chlorofluorocarbons are non-toxic, synthetic compounds that contain atoms of Chlorine, Fluorine and Carbon. They are commonly used in the manufacture of aerosol sprays and are also used as solvents and refrigerants. CFCs were first introduced in 1928 by General Motors Company for its refrigerators.

While CFCs are very safe to use in most applications and are stable in the lower atmosphere, these chemicals when released to the upper atmosphere can cause significant reactions. CFCs when released into the upper atmosphere can lead to the destruction of the ozone molecules followed by the release of the UV radiation into the atmosphere.

Thus, CFCs are man-made chemicals which cause ozone molecules to break down.

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The following are categorized into polar or nonpolar molecules:

a) Beryllium chloride (BeCl₂) is a nonpolar molecule. The Be-Cl bond is polar due to the electronegativity difference between beryllium and chlorine, but the molecule is linear with the two polar bonds pointing in opposite directions, resulting in a net dipole moment of zero.

b) Hydrogen sulphide (H₂S) is a polar molecule. The H-S bond is polar due to the electronegativity difference between hydrogen and sulfur, and the molecule has a bent shape, resulting in a net dipole moment that is not zero.

c) Sulphur trioxide (SO₃) is a nonpolar molecule. The S-O bonds are polar due to the electronegativity difference between sulfur and oxygen, but the molecule is trigonal planar with the three polar bonds pointing in different directions, resulting in a net dipole moment of zero.

d) Water (H₂O) is a polar molecule. The H-O bond is polar due to the electronegativity difference between hydrogen and oxygen, and the molecule has a bent shape, resulting in a net dipole moment that is not zero.

e) Trichloromethane (CHCl₃) is a polar molecule. The C-Cl bonds are polar due to the electronegativity difference between carbon and chlorine, and the molecule has a tetrahedral shape, resulting in a net dipole moment that is not zero.

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Answer:

Either direction

Explanation:

If you cook food it would go from cold to hot. If you were to put a drink in the fridge it would go from hot to cold. So it is either direction.

Without further details on the specific cell and its components, it is not possible to provide a definitive answer regarding the pH change before and after the cell operates for 20 minutes.

The pH value of a solution can potentially change before and after the operation of a cell, depending on the specific reaction occurring in the cell and the nature of the electrodes involved.

However, without additional information about the specific cell and its components, it is difficult to provide a definitive answer. The pH of a solution is influenced by the concentration of hydrogen ions (H+) in the solution, which can be affected by various chemical reactions, including oxidation and reduction reactions occurring in the cell.

During the operation of a cell, the electrodes undergo chemical reactions, and ions from the electrolyte may participate in these reactions. These reactions can influence the concentration of hydrogen ions and potentially alter the pH of the solution. The direction of the pH change depends on the specific reactions occurring at the electrodes.

For example, in an electrolytic cell, the flow of electric current causes non-spontaneous redox reactions to occur. These reactions might involve the generation or consumption of hydrogen ions, which can affect the pH of the solution.

In a galvanic cell or battery, spontaneous redox reactions take place, and the pH changes can be more complex. The electrode materials, their potential, and the specific reaction kinetics can influence the pH changes in the solution.

Therefore, without further details on the specific cell and its components, it is not possible to provide a definitive answer regarding the pH change before and after the cell operates for 20 minutes. The pH change would depend on the specific reactions occurring in the cell and the behavior of the electrodes involved.

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The final value for the enthalpy change of the formation of CO2 and 2H2O from their elements (C, H2, and O2) would be -1410 kJ per mole of CO2 and 2 moles of H2O formed.

The enthalpy change (ΔH) for the reaction CO2 + 2H2O → H2CO3 can be calculated by multiplying the stoichiometric coefficients of the balanced equation by the enthalpy values of the corresponding compounds involved in the reaction.

In the given reaction, the enthalpy change is -1410 kJ. However, it's important to note that this enthalpy change corresponds to a specific reaction and may not directly apply to the formation of CO2 and 2H2O from another reaction or process.

If we assume that the reaction is the formation of one mole of CO2 and two moles of H2O, we can say that the enthalpy change for this specific formation reaction is -1410 kJ.

Therefore, the final value for the enthalpy change of the formation of CO2 and 2H2O from their elements (C, H2, and O2) would be -1410 kJ per mole of CO2 and 2 moles of H2O formed.

It's worth mentioning that the enthalpy change can vary depending on the specific conditions (temperature, pressure, etc.) and the reactants involved in the reaction. Therefore, it's crucial to specify the conditions and reaction context when referring to enthalpy values.

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To determine the empirical formula of the metal bromide formed, we need to first calculate the amount of chromium reacted and the amount of bromine reacted. The amount of chromium reacted can be calculated using its molar mass, which is 52 g/mol: 19.66 g chromium x (1 mol chromium / 52 g chromium) = 0.378 mol chromium.

Since there is excess bromine, all of the chromium would react with bromine to form the metal bromide. Therefore, the amount of bromine reacted can be calculated using the mass of the metal bromide formed:

110.3 g metal bromide x (1 mol metal bromide / molar mass of metal bromide) = amount of bromine reacted

We don't know the molar mass of the metal bromide yet, but we can use the law of conservation of mass to determine it. The mass of the metal bromide formed must equal the sum of the masses of the chromium and bromine that reacted.

110.3 g metal bromide = 19.66 g chromium + mass of bromine reacted mass of bromine reacted = 90.64 g

Now we can calculate the amount of bromine reacted:

90.64 g bromine x (1 mol bromine / 79.904 g bromine) = 1.133 mol bromine

To determine the empirical formula, we need to find the ratio of the moles of each element in the metal bromide.

Chromium: 0.378 mol
Bromine: 1.133 mol

To get a whole number ratio, we can divide both of these values by the smaller value (0.378 mol):

Chromium: 0.378 mol ÷ 0.378 mol = 1
Bromine: 1.133 mol ÷ 0.378 mol = 3

Therefore, the empirical formula of the metal bromide is CrBr3.

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Answer:

b

Explanation:

causes onj the scale of 2 3 4 it equals s