help!!
207 mm = ___ m

Answer:all matter.

Explanation:

-Love Ricardo H. Sparks

Answer:

Atoms are the building blocks of life (everything basically)

Explanation:

Answer:

pressure on a balloon holding 433 ml of an ideal gas is increased from 688 torr to 1.00 atm. what is the newpressure on a balloon holding 433 ml of an ideal gas is increased from 688 torr to 1.00 atm. what is the new volume of the balloon (in ml) at constant temperature

The structure of 3-(tert)-butyl-2-ethyltoluene is a complex organic molecule composed of a toluene ring with an ethyl group and a tert-butyl group attached to the 3rd and 2nd carbon atoms, respectively.

The molecular formula of 3-(tert)-butyl-2-ethyltoluene is C16H26, indicating that it contains 16 carbon atoms and 26 hydrogen atoms. The molecule is composed of a toluene ring, which consists of a benzene ring with a methyl group attached to one of the carbon atoms.

The ring is then further substituted with an ethyl group (C2H5) and a tert-butyl group [(CH3)3C] attached to the 3rd and 2nd carbon atoms, respectively.

The structure of 3-(tert)-butyl-2-ethyltoluene can be visualized as a three-dimensional molecule, with the toluene ring in a planar orientation and the ethyl and tert-butyl groups extending outwards in different directions.

The molecule is characterized by its steric hindrance, which results from the bulky tert-butyl group attached to the toluene ring.

This can affect the reactivity and physical properties of the molecule, making it an important compound in organic chemistry research.

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#1: A covalent bond

#2 False

#3True

Answer:

volume= 1.77dL

first you'll find the moles using

Moles= Mass/Molar mass

After that you'll find the volume using

Molarity= Moles/Volume

Answer:

c. Waxing crescent

- I hope this helps have a great night

The IUPAC name for O3 is Trioxygen

Trioxygen is one of the three allotropes of the element oxygen

the compound has 3 atoms of oxygen bonded together

The compound is mostly found in the stratosphere where it forms a layer that absorbs ultraviolet rays the radiation  and convert them to thermal energy  preventing them from reaching the planet's surface.

The layer is quakily diminishing because of combining with halogens, especially chlorine and bromine atoms this is because  Trioxygen  is a reactive  gas thats why it compines with bromine and chroline.

The gas also is used in industries for the  purification of air and drinking water bleaching and industrial treatment of wastes.

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Explanation:

both b and c since it can be both

To make a buffer solution, you must use solutions of a weak acid and its conjugate base.

For example, if you wanted to make a buffer solution with a pH of 4.5, you would mix a solution of acetic acid (CH3COOH) and sodium acetate (CH3COONa).

The acetic acid is the weak acid and the sodium acetate is its conjugate base. The concentrations of the two solutions should be in a ratio of 1:1 in order to maintain the desired pH.

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Answer:

The answer is A and C

An example of The substance which is composed of aromatic hydrocarbins is :  Pain reliever.

Aromatic hydrocarbons are hydrocarbons in nature are composed of 6 rings of carbn atoms ( fused benzene rings ) certain compounds like petroluem contain aromatic hydrocarbons in nature. Certain medical drugs administered are composed of aromatic hydrocarbins an example of such drugs are pain relievers.

Hence we can conclude that the substance which is composed of aromatic hydrocarbons is pain reiever.

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A catalyst is a substance that can be added to a reaction to increase or decrease the reaction rate without getting consumed in the process.

Catalysts typically speed up a reaction by reducing the activation energy or changing the reaction mechanism. Enzymes are proteins that act as catalysts in biochemical reactions. Common types of catalysts include enzymes, acid-base catalysts, and heterogeneous (or surface) catalysts

The rate of a reaction depends on certain factors such as: -

Biological systems use catalysts to increase the rate of the oxidation reaction so that it can occur at a faster rate at lower temperatures. in this article, we will talk more about what a catalyst is, and the different types of catalysts.

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Answer:

1M

Explanation:

The molarity of a substance is defined as the number of moles of the substance divided by how many liters the solution is. NaOH has a molar mass of about 40 grams, meaning that 10 grams of it would be 0.25 moles. 0.25/0.25= a molarity of 1.

Hope this helps!

Answer:

Solids- slow

Liquids- medium

Gasses- fast

Explanation:

Answer:

Solids move slowly because they are the most condensed. Gases move the quickest, because they are the least condensed, and liquids are in the middle of the two.

Explanation:

I hope this helps! :)

Answer:

The picture?

Explanation:

Please the picture

This makes no sence. Please put the picture up for us to answer. Thanks!

Answer:

230.692

Explanation:

23.54kg*9.8m/s²= 230.692

Answer:

F = 230.69 N

Explanation:

Given data:

Mass = 23.54 Kg

Acceleration = 9.8 m/s²

Force = ?

Solution:

Mass ×Acceleration is equal to force.

F = 23.54 Kg × 9.8 m/s²

F = 230.69 Kg.m/s²

Kg.m/s² = N

F = 230.69 N

Let's say you have a stock solution of Tris with a concentration of 1 M. To calculate the volume of the stock solution needed, you can use the formula:
Volume of stock solution = (Final concentration * Final volume) / Stock concentration
Plugging in the values, we get:                                                                                                                                          Volume of stock solution = (40 mM * 250 mL) / 1 M = 10 mL
So, you will need to measure 10 mL of the Tris stock solution and add it to the final solution.

EDTA: You need a final concentration of 250 µM of EDTA. Similar to the Tris calculation, let's assume you have a stock solution of EDTA with a concentration of 1 M. Using the same formula as before, we can calculate the volume of the stock solution needed:
Volume of stock solution = (Final concentration * Final volume) / Stock concentration
Plugging in the values, we get:
Volume of stock solution = (250 µM * 250 mL) / 1 M = 62.5 µL
So, you will need to measure 62.5 µL of the EDTA stock solution and add it to the final solution.

3. NaCl: You need a final concentration of 5% NaCl. This concentration is expressed as a percentage, which means it is a weight/volume ratio. Let's assume you have a stock solution of NaCl with a concentration of 10% (w/v). To calculate the weight of NaCl needed, you can use the formula:
Weight of NaCl = (Final concentration * Final volume) / Stock concentration
Plugging in the values, we get:
Weight of NaCl = (5% * 250 mL) / 10% = 12.5 g
So, you will need to measure 12.5 g of NaCl and dissolve it in the final solution.

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Answer:

(E)-2-methyl-3-hexene will react most rapidly with HC1 due to stability of the intermediate carbocation formed during the reaction.

The reactivity of an alkene towards an electrophile like HC1 is mainly determined by the stability of the intermediate carbocation formed during the reaction. More stable carbocations are formed more easily, leading to a faster reaction. The order of stability for carbocations is tertiary > secondary > primary > methyl.

Therefore, the (E)-2-methyl-3-hexene, which has a tertiary carbocation intermediate, will react most rapidly with HC1. The other compounds have either a secondary or primary carbocation intermediate, except for 2-methyl-2-hexene, which has a symmetrical structure leading to a less stable intermediate.

Thus, it will react slower than (E)-2-methyl-3-hexene. Overall, the reactivity of an alkene with HC1 depends on the stability of the carbocation intermediate, which is influenced by the structure of the alkene.

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Acid precipitation, also known as acid rain or acid deposition, should be a concern for new age environmentalists due to its detrimental effects on ecosystems and human health.

It is caused by emissions of sulfur dioxide (SO2) and nitrogen oxides (NOx) from human activities, primarily the burning of fossil fuels. Acid precipitation can lead to the acidification of soil and water bodies, harming aquatic life, damaging forests, and corroding buildings and infrastructure.

Acid precipitation is a significant environmental issue that results from the release of pollutants into the atmosphere. When sulfur dioxide (SO2) and nitrogen oxides (NOx) are emitted into the air from human activities such as power generation, industrial processes, and transportation, they undergo chemical reactions and form sulfuric acid (H2SO4) and nitric acid (HNO3) respectively. These acids then combine with water vapor in the atmosphere and fall back to the Earth's surface as acid rain, snow, fog, or dry deposition.

The effects of acid precipitation are far-reaching. It can acidify soils, making them unsuitable for plant growth and reducing nutrient availability. In aquatic ecosystems, acid rain can lower the pH of lakes, rivers, and streams, leading to the death of fish, amphibians, and other aquatic organisms. It also damages forests by weakening trees and making them more susceptible to diseases and pests. Additionally, acid rain corrodes buildings, statues, and infrastructure, causing economic losses.

From a human health perspective, exposure to acid precipitation can have adverse effects. Inhalation of acid particles or gases can irritate the respiratory system, particularly for individuals with respiratory conditions such as asthma. Acid rain can also contaminate drinking water sources, posing risks to human health if consumed.

Given these detrimental effects, acid precipitation should indeed be a concern for new age environmentalists who strive for a sustainable and healthy environment. Efforts to reduce emissions of sulfur dioxide and nitrogen oxides, along with promoting alternative energy sources and adopting cleaner technologies, are crucial in mitigating the impacts of acid precipitation and preserving the well-being of ecosystems and human populations.

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q is a measure of energy exchanged or generated during a reaction in calorimetry. It is calculated using the equation q=m*c*∆T, and its sign tells you whether heat is being lost or gained by your system.

q does not stand for enthalpy, which is represented by the symbol H.

Calorimetry is an experiment used to measure the amount of heat exchanged or generated during a chemical reaction or physical change.

In calorimetry, the variable q, or heat transfer, is used to measure the energy of the reaction.

q is calculated using the equation q=m*c*∆T, where m is the mass of the system, c is the specific heat, and ∆T is the change in temperature.

The sign of q tells you whether heat is being lost or gained by the system. If the sign of q is negative, heat is being lost, and if the sign of q is positive, heat is being gained.

It is important to remember that q is a measure of energy and not of heat itself.

q does not stand for enthalpy. Enthalpy, represented by the symbol H, is the total energy of a system, which is made up of the internal energy plus the pressure-volume work.

It is not the same as q, which only measures the energy exchanged or generated during a reaction.

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Answer: The student must add 2 infront of both \(H_2O\) and \(SO_2\) to make the equation balanced.

Explanation:

A balanced chemical equation is one where all the individual atoms are equal on both sides of the reaction. It follows the law of conservation of mass.

For the given unbalanced chemical equation:

\(2H_2S+3O_2\rightarrow H_2O+SO_2\)

On the reactant side:

Atoms of H = 4

Atoms of S = 2

Atoms of O = 6

On the product side:

Atoms of H = 2

Atoms of S = 1

Atoms of O = 3

To balance the equation, a student must balance the atoms by adding 2 infront of both \(H_2O\) and \(SO_2\)

For the balanced chemical equation:

\(2H_2S+3O_2\rightarrow 2H_2O+2SO_2\)

The reaction between citric acid and water is endothermic.

There are two types of reactions based on whether heat is evolved or absorbed by a reaction. Those two types are:

The dissolution of citric acid in water is an endothermic reaction. The water feels cold because heat is absorbed from the surroundings as the reaction proceeds.

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Answer:

The electric force between them decreases

Explanation:

The force between two charged particle is given by :

\(F=\dfrac{kq_1q_2}{r^2}\)

Where

r is the distance between charges

If the distance between the charges is increased, the electric force gets decreased as there is an inverse relation between force and distance.

Hence, the correct option is (c) "The electric force between them decreases"

Titration is repeated at least 4 to 5 times in order to provide a statically valid answer.

What is Titration-

Titration is a typical laboratory technique for quantitative chemical analysis used to calculate the concentration of an identified analyte (also known as titrimetric and volumetric analysis) (a substance to be analyzed). A standard solution with a known concentration and volume is prepared as the reagent, also known as the titrant or titrator.

Its a form of volumetric analysis to uncover the concentration of a substance, and the readings should all be within a very small number of units of one another.

The closeness of two or more measurements to each other is known as the precision of a substance. Precision is independent of accuracy.

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Answer:

The faster the object falls the greater the air resistance. Terminal velocity is reached when the force due to air resistance (upward) equals the force due to gravity (downward). At terminal velocity there is no net force and therefore no further acceleration.

The relationship between the concentration of acid and its conjugate base is determined by the ratio of their ionization constants, Ka and Kb, respectively. Since the pH of the buffer is greater than the pKa of the acid, it can be concluded that the buffer is basic.

The chemical equation representing the dissociation of a weak acid, HA in water is:

HA + H2O ⇌ H3O+ + A-    (1)

The acid dissociation constant, Ka for HA is given as follows:

Ka = [H3O+] [A-] / [HA]    (2)

The base dissociation constant, Kb for the conjugate base, A- is given as follows:

Kb = [HA] [OH-] / [A-]     (3)

The relationship between Ka and Kb is as follows:

Ka × Kb = Kw    (4)

At pH 2.05, the concentration of H3O+ is 7.0 × 10-3 mol/L.

Using Equation (1), the concentration of A- can be calculated as follows:

[A-] = Ka [HA] / [H3O+] = (1.8 × 10-5) × (0.10) / (7.0 × 10-3) = 0.00026 mol/L

The volume of the buffer solution, V = 500 mL = 0.5 L

Using the Henderson-Hasselbalch equation, pH = pKa + log([A-] / [HA]) …(5)pKa = -log10 Ka = -log10 (1.8 × 10-5) = 4.74

Taking antilog of both sides of Equation (5),

[A-] / [HA] = 10pH - pKa = 10-2.69 = 0.0026[HA] = [A-] / 0.0026 = (0.00026 mol/L) / (0.0026) = 0.1 mol/L

The molar mass of the sodium salt of the conjugate base, A- is 144 g/mol. Therefore, the mass of the corresponding sodium salt of the conjugate base required to make the buffer with pH of 2.05 is:

Mass = Molar mass × Moles= 144 g/mol × (0.1 mol/L × 0.5 L)= 7.2 g

Firstly, the concentrations of acid and its conjugate base are required to make a buffer solution with a pH of 2.05. The acid dissociation constant (Ka) of the acid is known to be 1.8 × 10-5. At pH 2.05, the concentration of H3O+ is calculated to be 7.0 × 10-3 mol/L. The Henderson-Hasselbalch equation can be used to determine the concentration of acid and its conjugate base. In order to calculate the mass of the sodium salt of the conjugate base, the concentration of acid and its conjugate base, and the volume of the buffer solution must be determined. The molar mass of the sodium salt of the conjugate base, A-, is known to be 144 g/mol.

Therefore, the mass of the corresponding sodium salt of the conjugate base required to make the buffer with a pH of 2.05 is 7.2 g.

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.Answer:

.Marie Kondo

Answer:

Federal Government

Explanation:

:)))))))))

✌❤✌❤

Magnesium chloride crystals can be formed by reacting an insoluble base with an acid. The reaction can be represented by the following equation:

In this reaction, magnesium hydroxide (Mg(OH)₂) is the insoluble base and hydrochloric acid (HCl) is the acid. When these two substances react, they produce magnesium chloride (MgCl₂) and water (H₂O).

The magnesium chloride formed in this reaction is in the form of crystals. The crystals form because the reaction produces an excess of ions, which then attract to each other and form a lattice-like structure. This is known as crystallization. The magnesium chloride crystals are colorless and have a salty taste.

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