What is the mass of 18.5 moles of iron?

Answer:

liquid

gas

Explanation:

liquid has an indefinite shape

gas has an indefinite shape

Answer:

gas and liquid

Explanation:

gas and liquid flow around and take the shape of their containers because the molecules are more spread apart

Answer:

The answer would be C.

Explanation:

I took a test with the same question.

The activation energy is very high. Hence, option C is correct.

Activation energy is the sufficient amount of energy necessary to initiate a chemical reaction.

When sodium hydroxide (NaOH) dissolves in water, it is distributed into positively-charged sodium ions and negatively - charged hydroxide ions.

These cations and anions move around in the water, free and independent of each other, though cations tend to be surrounded more closely by anions and vice versa.

Hence, when sodium hydroxide and water will react at room temperature, the activation energy is very high.

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Answer: Sn (s)

Explanation:

Oxidation is losing electrons and Sn(s) charge is zero and Sn in the SnCl -2 ion is +4  so it lost 4 electrons

Here are three structures of carboxylic esters with the molecular formula C5H10O2 in which the group bonded to the oxygen atom has 4 carbons not in a continuous chain:

1. Structure 1:

    CH3

    |

    O

   / \

  C   C

  |   |

  C   C

  |

  C

  |

  CH3

2. Structure 2:

    CH3

    |

    O

   / \

  C   C

  |   |

  C   C

      |

      C

      |

      CH3

3. Structure 3:

    CH3

    |

    O

   / \

  C   C

  |   |

  C   C

  |  

  C

  |

  CH3

Please note that these structures are simplified representations of carboxylic esters, and the actual spatial arrangement of atoms may vary.

Carboxylic Acid is Any organic compound containing a carboxy group (—COOH), including amino acids and fatty acids, this is Any organic compound containing a carboxy group (—COOH), including amino acids and fatty acids.

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The following is true of pericyclic reactions: D. All of these statements are true of pericyclic reactions. The correct option is D.

Pericyclic reactions are a class of organic reactions that involve the simultaneous rearrangement of sigma bonds and pi bonds in a cyclic transition state. These reactions exhibit several characteristic features.

A. They are concerted reactions: Pericyclic reactions occur in a single step, without the formation of any intermediates. The reactants rearrange their bonds simultaneously to form the products.

B. They proceed via a cyclic transition state: During the reaction, the reactant molecules pass through a cyclic transition state where the rearrangement of bonds takes place. This cyclic transition state is often visualized as a ring-shaped structure.

C. No intermediates are formed: As pericyclic reactions are concerted, they do not involve the formation of any intermediates along the reaction pathway.

Therefore, all of these statements are true of pericyclic reactions. They are concerted, proceed via a cyclic transition state, and do not involve intermediates. These characteristics make pericyclic reactions distinct from stepwise reactions that involve the formation of intermediates. The correct option is D.

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The statements about these compounds which are true include:

This is formed when two or more elements combine together and an example is Sodium chloride from sodium and chlorine.

The body gets energy from carbohydrate and fat while compounds like protein can determine physical characteristics.

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Answer:  0.428%

Explanation:  % Error = [(measured - Actual)/Actual]*100%

    (93.9g - 93.5 g)/93.5g = 0.428%

Answer:

+0.4

Explanation:

For all those Acellus kids XD

The pKa value of formic acid is approximately 3.75. pKa is a measure of the acidity or basicity of a compound and represents the negative logarithm of the acid dissociation constant (Ka).

Formic acid, also known as methanoic acid, is a weak acid commonly found in nature. It is produced by various organisms, including ants, hence the name "formic" derived from the Latin word for ant, formica.

The pKa value of formic acid indicates that it is a moderately strong acid. In aqueous solutions, formic acid partially dissociates into hydrogen ions (H⁺) and formate ions (HCOO⁻). This pKa value is important in determining the acid strength and reactivity of formic acid in various chemical reactions and its behavior in different environments.

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Answer

- What is an electron?

An electron a stable subatomic particle with a negative charge of electricity, it is found in all atoms and acting as the primary carrier of electricity in solids.

- How does the electrons movement creates an electric current?

Electrons flow in a certain rate, creating an electric current. So the electrons moving freely from one place to another place will conduct electric current.

Answer:

Axis

Anatomy

In anatomy, the second cervical vertebra of the spine is named the axis or epistropheus. By the atlanto-axial joint, it forms the pivot upon which the first cervical vertebra, which carries the head, rotates.

Rotation

A rotation is a circular movement of an object around a center of rotation. A three-dimensional object can always be rotated about an infinite number of imaginary lines called rotation axis. If the axis passes through the body's center of mass, the body is said to rotate upon itself, or spin.

Revolution

In political science, a revolution is a fundamental and relatively sudden change in political power and political organization which occurs when the population revolts against the government, typically due to perceived oppression or political incompetence.

Elliptic orbit

In astrodynamics or celestial mechanics, an elliptic orbit or elliptical orbit is a Kepler orbit with an eccentricity of less than 1; this includes the special case of a circular orbit, with eccentricity equal to 0. In a stricter sense, it is a Kepler orbit with the eccentricity greater than 0 and less than 1.

:) gimme a crown plz

Answer:

Explanation:

Answer:

it is 3 sifnificant figure

Answer:

A. Because you have to simplify

Answer:

decomposition

Explanation:

i dont cap

Answer:a mouse

Explanation:

Answer: a mouse

Explanation:

The specific heat of the metal is 4.52 J/g°C.

What is specific heat?

Specific heat is the amount of energy needed to raise a substance's temperature by one degree Celsius per gramme. Typically, the units of specific heat are calories or joules per gramme per degree Celsius. The specific heat of water, for instance, is 1 calorie (or 4.186 joules) per gramme per degree Celsius.

The specific heat of a substance is the amount of energy (in joules) needed to raise the temperature of 1 gram of that substance by 1 degree Celsius.
To calculate the specific heat of the metal, we can use the following equation:
Specific heat = (mass of metal × change in temperature of metal) ÷ (mass of water × change in temperature of water)
In this case, the mass of metal is 20.0 g, the change in temperature of metal is 100°C - 28.3°C = 71.7°C, the mass of water is 100.0 g, and the change in temperature of water is 28.3°C - 25.2°C = 3.1°C.
Using these values in the equation gives us:
Specific heat = (20.0 g × 71.7°C) ÷ (100.0 g × 3.1°C)
Specific heat = 4.52 J/g°C
Therefore, the specific heat of the metal is 4.52 J/g°C.

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There are 0.1247 moles of calcium in 5.00 g of calcium.

The formula to calculate the number of moles is:

moles = mass (in grams) / molar mass

Substituting the values we have:

moles of calcium = 5.00 g / 40.08 g/mol

moles of calcium = 0.1247 mol

A mole is a unit of measurement that represents a certain number of particles. Specifically, one mole of a substance contains Avogadro's number of particles, which is approximately 6.02 x 10^23. These particles can be atoms, molecules, ions, or any other type of particle that can exist in a chemical system.

The concept of moles is important because it allows chemists to easily convert between the mass of a substance and the number of particles it contains. This is because the molar mass of a substance, which is the mass of one mole of that substance, is equal to the sum of the atomic masses of all the atoms in one molecule of that substance. This means that if you have 18 grams of water, you have one mole of water, and if you have any other mass of water, you can easily calculate how many moles of water you have using the molar mass.

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The volume of nitric oxide that will diffuse out of the partition in 10 seconds when methane diffuses is 62.5 mL

This is defined as the amount diffused per unit time. Mathematically, it can be expressed as

Rate = volume / time

Rate = volume / time

Rate = 25 / 4

Rate = 6.25 mL/s

Rate = volume / time

6.25 = volume of nitric oxide / 10

Cross multiply

Volume of nitric oxide = 6.25 × 10

Volume of nitric oxide = 62.5 mL

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Answer:

This question will be answered based on general understanding of how a controlled experiment should be:

The answer is: We must make sure we are testing/changing only one variable, and controling others

Explanation:

A controlled experiment is an experiment in which the independent variable is changed for a particular group called the EXPERIMENTAL group and unchanged for another group called the CONTROL group.

In a controlled experiment, only one variable should be tested while the others should be kept constant in order to have an effective result or outcome. This is the case in this question, the type of music or soil should be unchanged for each plant because the experimenter must make sure that he/she is testing/changing only one variable, and controling others.

Answer:

A compound consists of two or more different elements chemically combined.

An element is made entirely from one type of atom.

For example, the top left is stated as a compound because it contains two dark atoms and one grey atom, which are both different elements chemically combined, which means it is not an element.

The bottom left is an element because it consists of two dark atoms which are the same. It is made up of one type of atom - a dark atom. Thus it cannot be a compound.

A) To calculate the moles of potassium hydroxide (KOH) required to prepare a buffer with a pH of 3.190, we need to use the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

In this case, the acid is nitrous acid (HA), and the conjugate base is the nitrite ion (A-).

Given:

Volume of nitrous acid solution = 250 mL

Concentration of nitrous acid = 0.488 M

pH of the buffer = 3.190

First, we need to find the pKa value for nitrous acid. The pKa value can be found in reference sources or provided in the question.

Once we have the pKa value, we can rearrange the Henderson-Hasselbalch equation to solve for [A-]/[HA]:

[A-]/[HA] = 10^(pH - pKa)

Using the concentration of nitrous acid (HA) and the calculated ratio [A-]/[HA], we can determine the moles of nitrous acid:

Moles of nitrous acid = Concentration of nitrous acid × Volume of nitrous acid solution (in liters)

Finally, since the stoichiometric ratio between KOH and nitrous acid is 1:1, the moles of KOH required will be equal to the moles of nitrous acid.

B) To calculate the mL of sodium hydroxide (NaOH) required to prepare a buffer with a pH of 4.940, we follow a similar approach:

Given:

Volume of acetic acid solution = 125 mL

Concentration of acetic acid = 0.333 M

pH of the buffer = 4.940

Concentration of sodium hydroxide (NaOH) = 0.237 M

Using the Henderson-Hasselbalch equation, we can calculate the [A-]/[HA] ratio for the acetic acid buffer system.

Then, using the volume and concentration of acetic acid (HA), we determine the moles of acetic acid.

Finally, we can use the stoichiometric ratio between NaOH and acetic acid to calculate the mL of NaOH required.

C) To calculate the mL of perchloric acid (HClO4) required to prepare a buffer with a pH of 10.900:

Given:

Volume of methylamine solution = 125 mL

Concentration of methylamine = 0.382 M

pH of the buffer = 10.900

Concentration of perchloric acid (HClO4) = 0.356 M

Using the Henderson-Hasselbalch equation, we determine the [A-]/[HA] ratio for the methylamine buffer system.

Using the volume and concentration of methylamine (HA), we calculate the moles of methylamine.

Finally, using the stoichiometric ratio between HClO4 and methylamine, we calculate the mL of HClO4 required.

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The volume needed to make 1.98 M of the solution is 2.12L

Molarity of a given solution is defined as the total number of moles of solute per litre of solution. One molar is the molarity of a solution where one gram of solute is dissolved in a litre of solution. As we know, in a solution, the solvent and solute blend to form a solution, hence, the total volume of the solution is taken.

Given,

Molarity = 1.98m

Moles = 4.2 mol

Molarity = number of moles of solute / volume of solution in L

Volume = moles / molarity

= 4.2 / 1.98

= 2.12 L

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Answer: The correct answer is:

d. S < Ne < Ge < Rb

Explanation:

The atomic size generally decreases from left to right across a period of the periodic table due to increased nuclear charge and the electrons being added to the same energy level. Therefore, the atomic size of these elements can be compared as follows:

Rb has the largest atomic size among the given elements because it is located at the bottom of Group 1 (alkali metals) of the periodic table, which means it has the largest atomic radius.

Ge has a smaller atomic size than Rb because it is located to the right of Rb in the periodic table, which means it has more protons in its nucleus and a smaller atomic radius.

Ne has a smaller atomic size than Ge because it is a noble gas, and noble gases have the smallest atomic radii within a period of the periodic table.

S has a smaller atomic size than Ne because it is located to the right of Ne in the periodic table, which means it has more protons in its nucleus and a smaller atomic radius.

Answer:

temperature

Explanation:

When we have an acid-base reaction, the acid will be that substance that donates protons, in the form of H+ ions. The base will be the one that accepts the H+ ions. Now, the base that accepts the protons becomes a potential proton donor, thus becoming a conjugate acid. This is the case with H3O+.

H2O accepts H+ ions, so it is a base and when it becomes H3O+ it becomes a potential H+ proton donor, that is, a conjugate acid.

so, the answer will be B. Conjugate acid

At the onset of puberty, the pituitary gland in the brain starts secreting high pulses of hormones called gonadotropins.

The pituitary gland is a small, bean-shaped gland located at the base of the brain, in a small depression of the skull called the sella turcica. It is often referred to as the "master gland" because it controls and regulates the functions of several other glands in the body. The pituitary gland is divided into two main parts: the anterior pituitary and the posterior pituitary.

The pituitary gland produces and releases several hormones, including growth hormone, thyroid-stimulating hormone, adrenocorticotropic hormone, follicle-stimulating hormone, luteinizing hormone, prolactin, and oxytocin. These hormones play critical roles in regulating growth and development, metabolism, reproduction, and the body's response to stress.

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Answer:

15.547437000000029

Explanation:

The automobile can drive about 216.49 km on the mixed fuel if you are limited by your supply of 20.0 L of methanol.

The step by step solution is as follows :

Density of the fuel = 0.775 g/mL ; Density of methanol = 0.787 g/mL ; Density of gasoline = 0.703 g/mL.

The mixture contains 85% of methanol and 15% of gasoline by mass.

Mass of fuel in 20 L methanol = Volume of methanol × Density of fuel= 20 L × 0.775 g/mL = 15.5 g/mL

Mass of methanol in fuel = (85/100) × Mass of fuel= (85/100) × 20 L × 0.787 g/mL= 13.37 kg

Mass of gasoline in fuel = (15/100) × Mass of fuel = (15/100) × 20 L × 0.703 g/mL= 2.109 kg

Total mass = Mass of methanol + Mass of gasoline = 13.37 kg + 2.109 kg = 15.479 kg

Density of the fuel = 0.775 g/mL (given)

Volume of the fuel = Mass / Density = 15.479 kg / 0.775 g/mL = 19.97 L

Fuel efficiency = 25.5 miles per gallon

1 mile = 1.60934 kilometers

1 gallon = 3.78541 liters

Conversion factor = 1.60934 km / 3.78541 L ≈ 0.42514 km/L

Thus, the automobile can drive about 216.49 km on the mixed fuel if you are limited by your supply of 20.0 L of methanol.

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Answer:

Tin (IV) Phosphate

Explanation:

"Stock nomenclature for inorganic compounds is a widely used system of chemical nomenclature developed by the German chemist Alfred Stock and first published in 1919. In the "Stock system", the oxidation states of some or all of the elements in a compound are indicated in parentheses by Roman numerals."

in the combustion reaction of C₆H₁₂O₂, the carbon atoms is oxidized, while the hydrogen atoms are reduced during the combustion reaction. During combustion, a substance reacts with oxygen (O₂) to produce carbon dioxide (CO₂ and water (H₂O).

The carbon (C) and hydrogen (H) atoms present in the compound are the most common elements that undergo oxidation in combustion reactions. If one can consider a compound like glucose (C₆H₁₂O₆), which can be represented by the formula C₆H₁₂O₂,, the carbon atoms in glucose are being oxidized. During the reaction, each carbon atom in glucose loses electrons and gains oxygen atoms from the oxygen molecules (O₂). The carbon atoms in glucose increase their oxidation state, from a lower oxidation state in glucose to a higher oxidation state in carbon dioxide (CO₂).

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In the combustion reaction of C6H12O2, the reactant C6H12O2 is being oxidized.

In the combustion reaction of C6H12O2, the reactant C6H12O2 is being oxidized. Combustion reactions involve the reaction of a substance with oxygen to produce heat and light. In this case, C6H12O2 is a compound known as hexanoic acid.

During combustion, hexanoic acid reacts with oxygen to produce carbon dioxide (CO2) and water (H2O). The carbon atoms in hexanoic acid are oxidized from a lower oxidation state to a higher oxidation state, resulting in the formation of carbon dioxide. The hydrogen atoms in hexanoic acid are also oxidized to form water.

The combustion of hexanoic acid is an example of an organic compound undergoing oxidation.

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Answer:

Molar mass of the unknown gas is 8.96g/mol

Explanation:

Hello,

According to Graham's law of diffusion, its states that the rate of diffusion of a gas is inversely proportional to the square root of its molecular mass

R = k (1/√(M))

R = rate of diffusion

M = molecular mass

R₁ / R₂ = √(M₂ / M₁)

R₁ = nitrogen = 68.3s

R₂ = unknown gas = 85.6s

M₂ = molecular mass of the unknown gas

M₁ = molecular mass of nitrogen = 14g/mol

68.3 / 85.6 = (√M₂ / 14)

0.8 = (√M₂ / 14)

Take square of both sides

0.8² = M₂ / 14

M₂ = 14 × 0.64

M₂ = 8.96g/mol

The molar mass of the unknown gas is 8.96g/mol