decrease friction by causing a slight separation between
solid surfaces, so they don't contact each other.

Answer:

C) Aging

Explanation:

You can't stop that or change the rate that you age at. its inevetable :D

The proper sequence of events at the neuromuscular junction is:

Arrival of the action potential at the synaptic knob

Release of ACh into the synaptic cleft

Binding of ACh to ACh receptors in the motor end plate

Generation of action potential in sarcolemma

Removal of ACh from the cleft by acetylcholinesterase

The action potential travels down the axon of the motor neuron and reaches the synaptic knob. This causes the release of the neurotransmitter acetylcholine (ACh) into the synaptic cleft. The ACh binds to ACh receptors in the motor end plate of the muscle fiber, which leads to the generation of an action potential in the sarcolemma (muscle cell membrane). The action potential then travels along the sarcolemma and deep into the muscle fiber, causing muscle contraction. Finally, the ACh in the synaptic cleft is rapidly broken down by the enzyme acetylcholinesterase to prevent continuous muscle contraction.

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a. substituting in the expression of C(t) obtained in part a, we get,2500 = 12000/ (1 + 12000/ 5000 - 1) * e^(-2*3*t)  we get,t = 1/ (6 * log (2)) * log (5/3)≈ 0.276 h Therefore, it would take approximately 0.276 hours to reduce this concentration into C/2.

The differential equation for the indoor concentration of the given computer industry can be given as follows: dC/dt = P (0- C) - 2C²The above differential equation can be solved by the method of separating the variables as follows: dC/ (P (0- C) - 2C²) = dtIntegrating both sides, we get,-1/ [2P log (C/ (C- P0))] + (P0/ [P (C- P0)]) - (1/ (2C)) = t + c where c is the constant of integration. After simplification, the above equation can be expressed as:C(t) = P0/ (1 + (P0/ Co - 1) e^(-2Pt))The initial particle concentration Co is the value of C at t = 0. Hence, Ce = P0/ (1 + P0/ Co - 1) which can be simplified as Ce = Co/ (1 + P0/ Co - 1) = Co/P0b. Given that Co = 5000 cm³ and C/2 = 5000/2 = 2500 cm³,

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Answer:

At -20°C the mercury state will be liquid

Explanation:

The melting point of a substance is the temperature at which it changes from solid state to a liquid state, and the boiling point is the temperature at which it changes from liquid state to a gaseous state.

If mercury melts at -39°C and boils at 356.9°C, it means that if the temperature is lower than -39°C, mercury will remain al solid state. Between -39°C and 356.9°C, the state of mercury will be liquid and, above 356.9°C mercury will remain at gaseous state.

So, at -20°C the mercury state will be liquid, because that temperature it is between -39°C and 356.9°C.

Answer:

pressure

Explanation:

gas convert to liquid at high pressure.

The protein that is sensitive to Ca₂ and helps initiate muscle contraction is called troponin.

Troponins are a group of proteins that play a crucial role in muscle contraction, particularly in skeletal and cardiac muscles. They are composed of three subunits: troponin C (TnC), troponin I (TnI), and troponin T (TnT).

Troponin C binds to calcium ions (Ca²⁺) and undergoes a conformational change when Ca²⁺ levels increase. This change allows troponin I to release its inhibition on the actin-myosin interaction, allowing muscle contraction to occur. Troponin T anchors the troponin complex to the tropomyosin strands, which are filamentous proteins that regulate access to the myosin-binding sites on actin.

The interaction between troponin and calcium is a crucial step in the excitation-contraction coupling of muscles. When a nerve impulse stimulates muscle contraction, calcium ions are released from the sarcoplasmic reticulum into the muscle cell. The increased calcium concentration binds to troponin C, leading to the removal of tropomyosin from the myosin-binding sites on actin, enabling the myosin heads to attach and generate force, resulting in muscle contraction.

Troponins serve as regulatory proteins, allowing precise control of muscle contraction and relaxation. By responding to changes in calcium levels, they enable the initiation and regulation of muscle contraction in response to neural signals.

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The molar heat of fusion of iron is 2,747.7 cal/mol. Thus, option A is correct.

Molar heat of fusion is the amount of heat required to convert 1 gram of substance from liquid to solid.

The molar heat of fusion is given as:

\(q=\dfrac{m}{molar\;mass} \;\times \Delta H\)

The given sample has mass, m 200 g.

The molar mass of iron is 55.845 g/mol

The amount of heat released, q is  9,840 cal

The molar heat of fusion (\(\Delta H\)) is given by substituting the values as:

\(\rm 9,840\;cal= \dfrac{200\;g}{55.845 \;g/mol} \times\;\Delta H\\\\\Delta H=\dfrac{9,840\;cal\;\times\;55.845 \;g/mol}{200\;g} \\\\\Delta H=2,747.7 \;cal/mol\)

The molar heat of fusion of iron is 2,747.7 cal/mol. Thus, option A is correct.

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Answer:

he molar heat of fusion of iron is 2,747.7 cal/mol.

Explanation:

I think the element is oxygen

Answer: Aufbau series.

Explanation:

From the calculation, Suzanne is lying and she is guilty of killing her husband.

Stoichiometry provides a means of calculating the relationship between mass and mole or mole and volume in a reaction.

Now the preparation of ethylbenzene goes according to the reaction;

C6H6 + C2H6 ---->C6H5C2H5 + H2

Number of moles of benzene =  15 g/78 g/mol = 0.192 moles

Number of moles of ethyl benzene= 25 g/106 g/mol = 0.236 moles

Since the reaction is 1:1, 0.192 moles of ethyl benzene is produced.

Mass of 0.192 moles  of ethylbenzene =  0.192 moles * 106 g/mol = 20.4 g

Suzanne is lying.

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The molarity of an HCl solution if 50.0 ml is neutralized in a titration by 40.0 ml of 0.400M NaOH is 0.320 M.

HOW TO CALCULATE MOLARITY:

M1V1 = M2V2

Where;

According to this question,

M1 × 50 = 0.400 × 40

50M1 = 16

M1 = 16 ÷ 50

M1 = 0.32M

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Answer:

its legislative.

Answer:

when the reaction is complete 17 g product must be obtain.

Explanation:

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

Explanation:

This law was given by french chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

In given reaction,

2K  + I₂     →    2KI

4 g + 13.0 g  =  17 g

 17 g        =   17 g

So when the reaction is complete 17 g product must be obtain because the amount of reactants were 17 g and according to law of conservation of mass ,mass can neither be created nor destroyed in a chemical equation but only convert from one to another form.

Another example:

In  photosynthesis reaction:

6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂

there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction also followed the law of conservation of mass.

Answer: acetone

Explanation: Acetone has the weakest intermolecular forces, so it evaporated most quickly. Water had the strongest intermolecular forces and evaporated most slowly.

Answer:

Covalent

Explanation:

Chlorine monofluoride (ClF) is a chemical compound, and the atoms are connected by a single covalent bond.

Answer:

the volume of right circular cone is 5 liter calculate the volume of the two parts in to which the cone is divided by a plane parallel to the base one third on the way down from the vertex to the base give your answer to the nearest ml

6.0 × 10²³​ are the molecules  in 17 amu of ammonia, NH\(_3\). Therefore, the correct option is option D among all the given options.

The smallest recognizable unit in which a pure material may be split while retaining its composition and chemical characteristics is a molecule, which is a collection of two or more atoms.

Until portions made up of single molecules are reached, the split of a sample of a substance into increasingly smaller parts does not result in a change in either its makeup or its chemical characteristics.

molar mass of 1 mole of ammonia = 17 amu

1 mole of any substance contains 6.0 × 10²³​

6.0 × 10²³​ are the molecules  in 17 amu of ammonia, NH\(_3\).

Therefore, the correct option is option D among all the given options.

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Answer:

hey there!

I hope this is correct it is a adult plant

The answer is 67 108.0888km/s.

Answer:

c2h6

Explanation:

molecular weight=vapour density*2=2*15=30

molecular formula=empirical formula*n

n=molecular weight/empirical formula weight=30/15=2

so molecular formula2 * (ch3) alkane =c2h6

The molecular formula of an alkane whose vapor density is 15 will be C₂H₆.

The alkanes are the carbon and hydrogen-containing compounds said to be hydrocarbons in which carbon is bounded with hydrogen with a single covalent bond by sharing electrons.

The molecular weight of alkane is =  vapor density × 2

The molecular weight of alkane is = 15  × 2 = 30

n = molar weight/ empirical weight

n =  30 / 15 = 2

molecular formula = ( alkane)ₙ

molecular formula = (CH₃)₂

molecular formula = C₂H₆

Therefore, C₂H₆ is the molecular formula of an alkane whose vapor density is 15.

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An example which doesn't depict physical weathering is acid rain falling on limestone.

Physical weathering involves the breakdown of rock into smaller particles through physical processes such as friction between rocks as a result of wind blowing sand onto rocks, freeze-thaw in colder climates etc and it is usually reversible.

Chemical weathering on the other hand involves the  breakdown of rock into smaller particles through chemical processes or reaction  such as acid rain falling on limestone and it is usually irreversible.

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Answer:

The element was one of the alkaline metals, the dull appearance comes from the metal reacting with oxygen and oxidizing its outer surface as alkaline are known for their enormous reaction with oxygen in the air and water.

Another ability of this group of elements is the ability to conduct electricity. And they are also easy to cut with a kitchen knife.

When the engine's operating speed increases the temperature of the engine will also increase.

Given:

Automobile engines without a cooling system.

To find:

The affect on the temperature of the engine as its operating speed increases.

Solution:

The speed of the operating engine increases.

Velocity of object ∝ Kinetic energy of object...[i]

Kinetic energy  ∝ Temperature of object...[ii]

From [i] and [ii] :

Velocity of object ∝  Temperature of an object

So, from this, we can conclude when the engine's operating speed increases the temperature of the engine will also increase.

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Answer:

A

not sure of answer ndhfhfjfjcjfjfj

Answer:

1) Condensation.

2) See below.

Explanation:

1) The warmer water vapour from the surroundings came into contact with the cooler inner surface of the glass jar and condensed, forming the water droplets (water vapour) on the inside of the glass jar.

2) As condensation occurs, condensed water vapour will drip into the water solution in the glass jar, causing the water to rise in the glass jar.

The water in the 5-gallon jug will fill 160 glasses.

According to the issue, a glass carries 4 ounces of water while a jug holds 5 gallons. We must convert the jug's volume from gallons to ounces and divide it by the volume of glass in order to determine how many glasses can be filled from it.

The water in the jug needs to be converted from gallons to ounces first. A gallon contains 128 ounces, hence 5 gallons of water equal 5×128 = 640 ounces.

The amount of water in the glass is then divided by the amount of water in the jug. If a glass holds four ounces, then 160 glasses can be filled from the jug, or 640 divided by four.

It's vital to note that we are converting between units in this problem using the rule that 1 gallon = 128 ounces. This conversion factor is based on the units of a gallon and an ounce, which are both common measurements.

We can simply convert gallons to ounces using this conversion factor, which enables us to perform the calculations required to get the solution.

In conclusion, by dividing the volume of the 5-gallon jug of water by the volume of glass, 160 glasses can be filled from it. To accomplish this, we must use a conversion factor to convert water measured in gallons to ounces.

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Explanation:

First, we need to calculate the number of moles of sodium carbonate we have in a 25 g sample. To calculate this, we will

find the molar mass of sodium carbonate (Na2CO3):

⇒ 2 × Molar mass of sodium + Molar mass of carbon + 3×molar mass of oxygen

⇒ 2 × 23 + 12 + 3 × 16

⇒ 46 + 12 + 48

⇒ 106g/mol

Thus, the molar mass of Na2CO3 is 106g/mol.

Therefore, number of moles = 25 ÷ 106

=> 0.2358 mol

Now, we know that every mole of Na2CO3 have 0.2358 moles of Na+ ions. Hence, total moles of Na2CO3 is 0.4716 moles

Number of ions present = 6.022 × 1023 × 0.4716 mol = 2.84 × 1023ions

The molar mass of sodium carbonate is 106 g/mol. One mole of sodium carbonate gives 2 Na+ ions. Thus number of moles in 25 g of sodium carbonate is 0.47 moles.

Sodium ion Na+ is formed by the lose of one electron from the sodium metal. Sodium has one valence electron and it will reacts with other atoms by donating this electron and gaining a positive charge.

The molecular formula of sodium carbonate is Na₂CO₃. Therefore, one mole of sodium carbonate will give two moles of Na+ ions. The molar mass of sodium carbonate is 106 g/mol.

The number of moles of 25 g of sodium carbonate is calculated as follows:

Number of moles = 25 /106

                             =  0.235 moles.

It is clear that one mole of Na₂CO₃ gives two moles of sodium ions.Then, number of moles of sodium ions given by 0.235 moles of sodium carbonate is calculated as follows:

number of moles of Na+ = 0.235 × 2

                                         = 0.47 moles

Hence, the number of moles of Na+ ions produced by 25g of sodium carbonate is 0.47 moles.

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