why do substances exist in liquids solids or gasses

Volume of oxygen would be collected at STP is 293.3 ml

V1 = 293 mL

V2 = ?

P1 = 102 kPa

P2 = 100 kPa

T1 = 10°C = ( 273 + 10 ) = 283 k

T2 = 273 k

The Combined Gas Law combines Charles Law, Boyle s Law and Gay Lussac s Law. The Combined Gas Law states that a gas pressure x volume x temperature = constant

The combined gas law is an amalgamation of the three previously known laws which are- Boyle's law PV = K, Charles law V/T = K, and Gay-Lussac's law P/T = K. Therefore, the formula of combined gas law is PV/T = K, Where P = pressure, T = temperature, V = volume, K is constant.

P1V1/T2 = P2V2/T2

102 x 293 / 283 = 100 x V2 / 273

105.6 = 0.36 x V2

105.6/0.36 = 293.3

V2 = 293.3 ml

Hence, volume of oxygen would be collected at STP is 293.3 ml

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The concentration of sulfuric acid in mol/dm3 and g/dm3 would be  5.194 and 0.053 respectively.

From the equation of the reaction, the mole ratio of the concentrated sulfuric acid and sodium hydroxide solution is 1:2.

Recall that: mole = molarity x volume

For 26.5 cm3 0.100 mol/dm3 sodium hydroxide solution, the number of moles of the solute in the solution can be calculated as:

26.5/1000 x 0.100 = 0.00265 moles

The equivalent number of moles of the concentrated sulfuric acid will be:

                  0.00265/2 = 0.001325 moles

Also, recall that:

Concentration in g/dm3 = mass/volume

concentration in mol/dm3 = mole/volume

For 0.001325, 25.0 cm3 sulfuric acid:

mass = 0.001325 x 98 = 0.12985 g

Concentration in g/dm3 = 0.012985/0.025

                                       = 5.194 g/dm3

Concentration in mole/dm3 = 0.001325/0.025

                                         = 0.053 mol/dm3

Hence, the concentration of the sulfuric acid in mol/dm3 and g/dm3 would be 5.194 and 0.053 respectively.

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The reaction Mg + 2 NaF --> MgF₂ + 2Na is a single replacement reaction; option B.

A chemial reaction is a srecation in which atoms of elements under chemical changes to form new products.

The various types of chemical reactions include:

A single replacement reaction is a reaction in which a single atom or a radical replaces another atom or radical in a compouds.

For example, the reaction given below is a single replacement reaction:

Mg replaces N ain the compound NaF.

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The organic compound, carboxylic acid will be found in ethyl acetate.

Organic compounds are those compounds that are obtained naturally from living matter.

Organic compounds are mostly composed of carbon, hydrogen, and oxygen.

Organic compounds are generally covalent compounds. Hence, they are usually non-polar compounds.

Based on the principle of like dissolves like, organic compounds are usually soluble in non-polar organic solvents and insoluble in polar inorganic solvents like water.

Carboxylic acid is an organic compound.

Ethyl acetate is an organic compound.

Aqueous NaHCO₃ is an inorganic compound.

Hence, carboxylic acid will dissolve in Ethyl acetate.

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19) [Kr] 5s 4d05p³ is the electron configuration that is not valid and in which the configuration rule has been violated amongst all the options

In both the cases of atomic physics and quantum chemistry, this term electron configuration talks about the distribution of electrons of an atom or molecule in any atomic or molecular orbitals.

The formula for it is [tex]2n^2[/tex], where n is the shell number. The tables below list the shells, n values, and the total number of electrons that can fit.

More than eight electrons can fit into the shell one inside the outermost shell in transition metals. Consider argon (Ar).

Its 18 electrons are arranged in a 2-8-8 pattern. Scandium (Sc) contains 21 electrons and is only 3 places away, however its configuration is 2-8-9-2.

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functional group: an atom, or group of atoms (with specific connectivity), exhibiting ... contain only carbon-carbon and carbon-hydrogen single bonds.

Organic Molecules: The study of the characteristics of carbon-based compounds is known as organic chemistry. Except for a few inorganic carbon molecules, all carbon compounds are organic. The carbon oxides, metal ion bicarbonates and carbonates, metal cyanides, and a few more substances are examples of inorganic carbon compounds.

Hydrocarbons:Only carbon and hydrogen atoms make up the simplest organic molecules. Hydrocarbons are pure carbon and hydrogen compounds.

Alkanes: Methane, or CH4, is the most basic hydrocarbon. This is the most basic hydrocarbon in a group. The carbon atom count in each subsequent member of the series is one more than in the one before it. Alkanes are this group of chemicals (CnH2n+2). The less dense ones are utilised as fuels and are gases. the centre ones

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7 waters of hydration were attached to the  MgSO4.

1. 547 grams of hydrated mgso4 is heated in a crucible.

molecular weight of mgso4= 120 g/mol

let, x number of water molecule present in this hydrated mgso4

then, molecular weight = 18x +120.

MgSO4.X(H2O)-------> MgSO4 +X( H2O)

IF , n mole of hydrated mgso4 taken in the reactant side then , n mole of

anhydrous MgSO4 produce according to reaction.

n= 1. 547 /18x +120;

which is equal to mole of anhydrous MgSO4 that is

n=  0. 7554 /120;

by equating both equations

we get ,

0. 7554 /120 = 1. 547 /18x +120;

x= 7 (nearly.)

hence, 7 waters of hydration were attached to the  MgSO4.

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One of these neurotransmitters, dopamine, is released in the reward area of the brain and results in pleasurable feelings and an uplifted mood. More nicotine is required to feel good the more you smoke.

The nightshade plant family naturally produces nicotine, an alkaloid that is widely used recreationally as a stimulant and anxiolytic. It is a medication meant to decrease withdrawal symptoms in smokers who desire to quit.

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1.86 g H₂ is allowed to react with 9.70 g N₂ producing 1.24 g NH₃. the theoretical yield in grams for this reaction under given conditions is 10.54 g.

The balanced chemical equation is given by :

N₂   +   3H₂  ------>   2NH₃

it is clear from the reaction that :

1 mole of  N₂ react with 3 moles of H₂ to produced 2 mole of NH₃.

the molar mass of compounds are :

H₂ = 2 g/mol

N₂ = 28 g/mol

NH₃ = 17 g/mol

3moles of H₂ × 1 g/mol= 6 g  

1 mole of N₂ × 28 g/mol= 28 g

2 moles of 2NH₃  × 17 g/mol = 34 g

now we have to find out the limiting reagent :

28 g of N₂ react with 6 g of H₂ , 9.70 N₂ will react with how much mass of H₂

mass of H₂ = (9.70 g of N₂ × 6 g of H₂) / 28 g of N₂

                  = 2.07 g

but 2.07 g H₂ is not available , only 1.86 g are available .so, H₂ is a limiting reagent.

The theoretical yield in the given case:

mass of NH₃ = (1.86 g of H₂ × 34 g of NH₃ ) / 6 g of H₂

                     = 10.54 g

Thus, 1.86 g H₂ is allowed to react with 9.70 g N₂ producing 1.24 g NH₃. the theoretical yield in grams for this reaction under given conditions is 10.54 g.

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Mass of magnesium ribbon is 0.21 g.

Mass of oxygen gas reacts with magnesium is 0.11 g

Number of moles of magnesium is 0.00875

Number of moles of oxygen is 0.0068.

Ratio of moles of magnesium and oxygen = 1.2 : 1

The number of moles of a substance equals the ratio of its given mass in a chemical reaction to the mass of one mole of that substance. One mole of any substance equals Avogadro's number, that is, 6.023 × 10²³.

we know that mass of crucible and lid = 35.56 g

mass of crucible and lid and magnesium = 35.77 g

Thus mass of magnesium = 35.77 - 35.56 = 0.21 g

mass of crucible and lid and magnesium oxide = 35.88 g

thus, mass of oxygen = 35.88 - 35.77 = 0.11 g

Now, Number of moles of magnesium = 0.21/24 =  0.00875

         Number of moles of Oxygen = 0.11/16 = 0.0068

Ratio of Number of moles of magnesium to Number of moles of Oxygen = 0.00875/0.0068 = 1.2 : 1.

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Answer: The answer would be deciduous (answer E)

Explanation: A deciduous is a term which means “ Tending to fall off” or “falling off at maturity” in reference to trees and shrubs that seasonally shed leaves, usually in autumn (fall); to the shedding of petals, after flowering; and to the shedding of ripe fruit!

Answer:

Deciduous

Explanation:

Engineers do to lower impact forces by increasing  the collision duration.

Any time two objects collide, a collision occurs. Conservation of momentum and conservation of energy are typically used to resolve collision-related problems.

Collisions can occur in two ways:

In elastic collisions, no energy is wasted to other forms and is entirely retained as kinetic energy. It follows that momentum and kinetic energy are both preserved.

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Height in inches is 62.6 inches and weight in pounds are 101 pounds

Height is a way to measure someone or something from base to top or head to toe

Here given data is student height = 159cm tall and weight is =  45.8kg

So we have to convert

Height in cm = height in inches

Weight in kg =  weight in pounds

So, 1 inches = 2.45cm

Height =  159cm×1 inches/ 2.45cm

Height = 62.6inches

Now, 1kg = 2.2045  pounds

Weight = 45.8kg×2.2045  pounds/1kg

Weight = 101 pounds or lbs

Height = 62.6inches and weight = 101 pounds or lbs

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Answer:

Between genuine solutions and suspensions, colloids solutions and suspensions represent a middle ground. The colloid solution's solvent-dispersed particles' diameters range from 10 to 2000 A. Milk and butter are examples

The leftover sample will be cut in half again.

4000 atoms⋅1/2=2000 atoms

after 3200 years

As a result, your initial sample of radium-226 will be reduced to 2000 atoms.

Radium is created by the radioactive decay of uranium. Radiation intensity from radioactive materials reduces with time. The half-life is the time necessary for the intensity to diminish by one-half. Radium has a half-life of around 1,600 years.

Gamma radiation has the most energy of any kind of radioactive decay. Gamma radiation contains the greatest energy waves in the electromagnetic spectrum.

Radium is presently utilised to make radon, a radioactive gas that is used to cure some forms of cancer.

The historically significant transition of radium 226 into radon 222 by alpha particle emission is an example of alpha decay.

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1. closer

2. 24-hour

3. tidal bulges

4. at a right angle

Explanation:

Not sure bout the last one but hope it helps

Answer:

Listed below

Explanation:

COMPOUND

1. It is a pure substance.

2. It can not be separated by a physical method.

3. Element loses their properties in a compound.

4. Its composition is fixed throughout its mass.

5. It has a fixed melting point.

6.In nature they are homogeneous.

MIXTURE

1. It is an impure substance.

2. It can be separated by a physical method.

3. Substances forming mixture retain their properties.

4. It has no fixed composition.

5. It has no sharp melting point.

6. They can be homogeneous as well as heterogeneous in nature.

Answer:

4,890,000,000,000

Explanation:

To convert out of scientific notation, you would take the beginning number and move the decimal to the right 12 spaces.

(keep in mind that if the twelve was negative you would move to the left 12 spaces)

The concentration of NO is obtained as 3.5 * 10^-3 M.

We can see from the question that the equation of the reaction has been give. We need to recall that the equilibrium constant shows us the extent to which the reactants have been converted into products.

The more the conversion of the reactants to products, the larger the magnitude of the equilibrium constant. We can now use the values as we have them to find [NO]

If Kc = 4.10 * 10^-4

4.10 * 10^-4 =  [NO]^2/[[tex]N_{2}[/tex]] [[tex]O_{2}[/tex]]

[NO] = √4.10 * 10^-4 * 0.2 * 0.15

[NO] = 3.5 * 10^-3 M

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The given examples depict law of reciprocal proportions.

Jeremias Ritcher put forward the law of reciprocal proportions in 1792. The ratio of the masses in which they do so is either the same or a simple multiple of the mass ratio in which they combine, according to the statement, "If two different elements combine independently with the same weight of a third element."

a. Metal oxide contains

M = 0.46 g.

O = 0.77−0.46 = 0.31 g

Therefore, weight of oxygen that combines with 1g of

Metal = 0.31/0.46 = 0.674 g

b. 0.82g of Metal liberates H₂ = 0.00009 × 760 = 0.068g

Thus, the weight of H₂ that will be liberated by 1g of

Metal = 0.068/0.82 = 0.083 g

According to (a) and (b) the ratio of the weight of O:H that combine with or is displaced by the same weight of metal is 0.674:0.083 or 8:1.

Again according (c ), 1.25g of water contains

O= 1.12g and

H 1.25 − 1.11 = 0.14g

Therefore, The ratio of O:H::1.11:0.14 or 8:1

Hence, that ratio being the same, the law of reciprocal proportions is illustrated.

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In the experiment in which a scientist is testing if caffeine helps mice run games faster;

An experiment is a scientific test or study which is performed in order to prove or disprove a hypothesis.

Experiments can also be undertaken in order to further establish or improve upon already established.

Variables are those factors that are studied in an experiment.

In a scientific experiment, the following variables are present:

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The acceleration for the second part of the race is 0.3m/s².

Acceleration is the amount by which a speed or velocity increases. The acceleration can be calculated by dividing the speed of the object by the time taken as follows:

Acceleration = speed/time

According to this question, Sally is swimming 6 meters every 2 seconds, however, this increase in speed took 10 seconds.

The speed Sally is swimming is 3m/s i.e. 6/2. Hence, the acceleration can be calculated as follows:

Acceleration = 3m/s ÷ 10s

Acceleration = 0.3m/s²

Therefore, 0.3m/s² is the acceleration for the second part of the race.

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B

Matter is anything that can be touched physically. Everything in the universe (except energy) is made of matter, and, so, everything in the universe is made of atoms. An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons.

In the given reaction chemical equilibrium;

Le Chatelier's principle states that for a chemical system in equilibrium if an external constraint is applied o the system, the equilibrium position will shift so as to annul the effect of the constraint applied to the system.

In practical terms, this principle implies that if the forward reaction of a system in equilibrium is endothermic and the backward reaction is exothermic, adding more heat to the system will shift the equilibrium position of the reaction to favor the forward reaction.

Considering the given chemical equilibrium, the forward reaction is endothermic and results in the formation of OH⁻ ions.

Therefore, the addition of more OH⁻ will shift the equilibrium to the left whereas, the addition of heat will shift the equilibrium to the right.

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Complete question:

Use Le Châtelier's principle to predict how the equilibrium for the weak base methylamine responds to the indicated changes.

CH₃NH₂ (aq) H₂O (l) ⇄ CH₃NH₃⁺ (aq) + OH⁻ (aq) ΔH°rxn = 103 kJ/mol

1) adding KOH

2) Increasing the temperature

Answer:

Median is 29.

Explanation:

add all them up and divide them

Weight Doesn't change with location. (will NOT change if you take an object to Mars).

weight DOES change with location. (will change if you take an object to the Moon.

Mass Is a measure of amount of Matter in an object. Is a measure of the pull of Gravity on an object.

Weight Is measured with a scale,

Mass Is measured with a triple beam balance.

Mass Is used to calculate Density.

The triple beam balance is an instrument used to measure mass very precisely. Such devices typically have a reading error of ±0.05 grams. Its name refers to its three beams, where the middle beam is the largest, the far beam of medium size, and the front beam the smallest.

The triple beam balance is a typical instrument used to measure the mass of various objects. It consists of three beams, each of which is provided with a single sliding weight that has a size corresponding to the gradations of the notched scale on each beam..

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It is 21,000 kilometers around the earth and the earth rotates in 24 hr then 875 km/hrs fast is it rotating

Earth spins on its axis and earth takes one day one rotation on its axis

It is 21,000 kilometers around the earth rotates in 24 hrs and we have to find how many km/hr earth rotating = ?

So, distance = 21,000km

Time = 24 hrs

Speed = 21,000km/24 hrs

= 875 km/hrs

875 km/hrs fast is it rotating

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Answer: cheting is not alllowed is this homework or not

Explanation: