Explain the similarities and differences between putting a beaker of ethanoic acid in the refrigerator and mixing it with sodium carbonate. Use these words: chemical,physical, reversible, irreversible. ​

sauce burning on a stove and firing a clay pot in a hot kilnBoth are physical changes. Therefore, option D is correct.

Physical changes can be defined as changes affecting the state of a chemical substance, but not its composition. Physical changes can be used to separate mixtures into their component compounds, but can not generally be used to separate compounds into elements or simpler compounds.

Physical changes takes place when substances undergo a change that can not change their composition. while the chemical change in which the composition of a substance changes when substances combine or break up to form new substances.

In general a physical change can be consideed as reversible using physical means. A physical change includes a change in physical properties such as change of strength, change of durability, textural change, shape, size, volume and density.

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The number of moles of ammonium chloride present in a solution created by dissolving 12 grams of ammonium chloride in water to make 255 ml solution is 0.224 mol.

The number of moles of a substance is defined as the ratio of the mass of the substance to the molar mass of the substance. It is denoted by "n". It is given as

n=mass/molar mass

Given,

mass of ammonium chloride= 12 grams

we know that,

atomic mass of Nitrogen(N) = 14g /mol

atomic mass of Hydrogen (H) = 1 g/mol

atomic mass of Chlorine (Cl)= 35.5 g/mol

molar mass of ammonium chloride (NH₄Cl)

= ( 14+ 1×4 + 35.5) g/mol

=53.5 g/mol

therefore,

number of moles of ammonium chloride

= mass/molar mass

=12g/53.5gmol⁻¹

=0.224 mol

Thus, 0.224 moles of ammonium chloride are present in the resulting solution.

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Answer:

Explanation:

The lupac name of this compound is 2-Oxohexanoic acid. This compound is composed of two oxygen atoms, six carbon atoms, and one hydrogen atom. The parent chain is made up of six carbon atoms, and the functional group is a carboxylic acid group (COOH)

The part of the system that has two outputs of energy is the bulb.

We would have to recall that on the basis of the first law of thermodynamics, it can be said that energy can not be created nor destroyed but that energy would have to be converted from one form to the other.

In this case, we can see that as the boy is cycling, there is the conversion of the mechanical energy of the boy to the heat and the light energy of the bulb as shown. These are the outputs referred to above.

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The three types of elements are metals, non-metals as well as metalloids, there are placed in a periodic table.

In a periodic table, metals are placed in s-block and d-block. While non-metals as well as metalloids are placed in p-block. Metals are generally lustrous, malleable as well ductile in nature and are usually hard in nature while non-metals lack these properties. Metalloids are the elements whose chemical as well as physical properties lies between both metals and non-metals. Examples of metals are sodium and potassium. Examples of non-metals are carbon and phosphorus while examples of metalloids are silicon and germanium.

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To solve this we must be knowing each and every concept related to Law of constant proportion. Therefore, the results are in agreement with the law of constant proportion.

Chemical compounds are composed of components that are present in a set ratio by mass, according to the Law of Constant Proportion. The Proust law or Law of Definite Proportions is another name for the Law of Constant Proportion. NaCl will continue to have a 1:1 mass ratio.

mass of NaCl = mass of Cl +  mass of Na

0.25 g= 0.1518 gm+ mass of Na

mass of Na = 0.0982 gm.

ratio of 1st sample= mass of  Cl /mass of Na

                                       =  0.1518  gm/ 0.0982

                                      =1.54                            

In the second sample, NaCl weighs 0.24 g, Cl weighs 0.1458 g and Na weighs 0.0942 g.

ratio of 2nd sample is = 0.1458 g/0.0942 g.

                                            =1.54

Therefore, the results are in agreement with the law of constant proportion.

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Isabella has a pool that has an area of 678.32 dam² while Taddeo has one of 865.42 m². Which pool has the largest surface area?

Solution :

We know, 1 dam² = 100 m².

So, area of Isabella pool in m² is :

A = 678.32 × 100 m² = 67832 m² .

Therefore, area of Isabella is greater that volume of Taddeo .

The density of gas can change, in contrast to the density of solids or liquids. This is due to the fact that gas is not compact and that temperature and pressure have an impact on its molecules.

The formula is d = MP/RT, where d is the gas's density in kilograms per liter, M is its molar mass in grams per mole, P is its pressure in atmospheric pressure units, and R is the gas law constant. The equation demonstrates that the molar mass increases as gas density increases. The pressure and temperature parameters for the gas determine the gas's density. Gas can dramatically alter its volume with a change in pressure due to its strong compressibility. Therefore, changes in density (at low pressure) can be substantial.

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22.3 g of NaN₃ are required to fully inflate an airbag of 11.5 L at STP.

Chemical decomposition, also known as chemical breakdown, is the process of breaking down a single chemical entity into two or more components. Chemical breakdown is commonly thought of and characterized as the inverse of chemical synthesis. When one reactant breaks down into two or more products, this is referred to as a decomposition reaction. This is expressed by the following generic equation: AB A + B. The breakdown of hydrogen peroxide to water and oxygen is an example of a decomposition process, as is the breakdown of water to hydrogen and oxygen.

Here,

In airbags, sodium azide decomposes to form sodium and nitrogen gas, which inflates the bag. The decomposition reaction is:

2 NaN₃ ⇒ 2 Na + 3 N₂

We can calculate the mass of NaN₃ needed to produce 11.5 L of N₂ at STP, using the following relations.

At STP, 1 mole of N₂ occupies 22.4 L.

The molar ratio of N₂ to NaN₃ is 3:2.

The molar mass of NaN₃ is 65.01 g/mol.

=11.8*1/22.4*2/3*65.01/1

=118/112*21.67

=22.82 g

22.3 g of NaN₃ are required to fully inflate an airbag of 11.5 L at STP.

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Answer:

metals and nonmetal ions

Explanation:

Ionic bonds form when a nonmetal and a metal exchange electrons, while covalent bonds form when electrons are shared between two nonmetals. An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions.

Answer:

It's Simple earth just moves noob

Answer:Newton’s first law

Explanation:

The fourth and fifth periods contain 18 elements rather than 8 as observed in the second and third period because of the accommodation of 10 additional electrons in the 3d orbital.

The number of orbitals that can be accommodated by s subshell is one, p subshell is three, d subshell is five and f subshell is seven.

In the second and the third period, the 2s subshell is filled with two electrons, 2p subshell with six electrons .So, the second period contains eight elements. The sequence in third period is similar to that of second period with additional filling of 3s and 3p subshell.

In the fourth period, electrons are first filled in the 4s subshell, only after that they can be filled in the 3d subshell. So, fourth period contains 18 elements , which is due to the additional 10 electrons in 3d subshell. This is similar in the case of fifth period also.

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Wave nature of matter is responsible for interference pattern being exhibited by electrons.

Shortly after de Broglie proposed the wave nature of matter, two scientists at Bell Labs, C.J. showed experimentally that electrons can exhibit wave-like behavior. The wave-like motion of electrons is mathematically described by the so-called Bloch wave function. Named after his 20th-century physicist Felix Bloch, who first described the behavior of electrons in crystalline solids, these wavefunctions are complex. That is, it has both real and imaginary components.

These waves are called matter waves because electrons are a type of matter. Here,we relate the quantitative features of matter waves to familiar and measurable physical quantities such as energy, mass, and momentum.

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Answer:

1 grams K2SO4 to mol = 0.00574 mol

10 grams K2SO4 to mol = 0.05739 mol

50 grams K2SO4 to mol = 0.28693 mol

100 grams K2SO4 to mol = 0.57386 mol

200 grams K2SO4 to mol = 1.14772 mol

500 grams K2SO4 to mol = 2.86929 mol

1000 grams K2SO4 to mol = 5.73858 mol

Answer:

True

Explanation:

Fusion of hydrogen is the main source of the sun's energy.

Answer:

The primary source of solar energy, and that of similar size stars, is the fusion of hydrogen to form helium (the proton–proton chain reaction), which occurs at a solar-core temperature of 14 million kelvin.

so I think true

Answer:

I would say D (not sure tho)

Explanation:

The number of K atoms present in 195.49 grams of K is 3.0110 × 10²⁴ atoms. The correct option is a 3.0110 x 10²⁴.

We are to determine the number of K atoms present in 195.49 grams of K.

First, we will determine the number of moles K present

number of moles =[tex]\frac{mass}{molar mass}[/tex]

Atomic mass of K = 39.0983 g/mol

Number of moles of K present = [tex]\frac{195.49}{39.09}[/tex]

Number of moles of K present = 4.99996 moles

Number of moles of K present ≅ 5 moles

Now, for the number of atoms present

From the formula

Number of atoms = Number of atoms × Avogadro's constant

Number of K atoms present = 5 × 6.022 × 10²³

Number of K atoms present = 5 × 6.022 × 10²³

Number of K atoms present = 30.11 × 10²³

Number of K atoms present = 3.0110 × 10²⁴ atoms

Hence, the number of K atoms present in 195.49 grams of K is 3.0110 × 10²⁴ atoms. The correct option is a 3.0110 x 10²⁴.

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Carbon 14 would have more neutron than nitrogen 14

The atomic number of an atom, as is generally known, represents the total number of protons that make up the nucleus of that atom. We are aware that the mass number of carbon is 14, and that its atomic number is 6. It is well-known that protons and neutrons combine to form mass. As a result, there will be = 14 - 6 = 8 neutrons.

while he mass number of nitrogen is 14, and that its atomic number is 7. It is well-known that protons and neutrons combine to form mass. As a result, there will be = 14 - 7 = 7 neutrons.

Therefore, Carbon 14 would have more neutron than nitrogen 14

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Nitrous acid HNO_2 would be more suitable for use in a solution buffered at pH = 7.0.The other ion needed to make the buffer would be the conjugate base of the acid, which in this case would be the nitrite ion NO_2^-.

A, The Ka value is an indication of the strength of an acid; the lower the Ka value, the weaker the acid. Therefore, the hypochlorous acid HClO has a weaker acidity than nitrous acid HNO_2 and would be less suitable for use in a solution buffered at pH = 7.0.

B, Buffers work by maintaining a certain pH by providing a source of a weak acid and its conjugate base. Therefore, the other ion needed to make the buffer is the conjugate base of the acid, which in this case is the nitrite ion NO_2^-.

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Answer:

A

Explanation:

covalent bond exists in carbon dioxide

Answer:

low melting point, high density, and acid resistance

Explanation:

The  statement which best explains why the atomic theory developed efficiently is that scientists had used creativity and the scientific method in their investigations regarding the atom.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

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Answer: the answer is B

Explanation: just did it hope it helps

Answer:

HCl

Explanation:

Hydrochloric acid is oxidized to water

One mole of Helium contains 6.02 × 10²³ atoms. Mass of one mole is 4 g. Then, He containing 5.6 × 10²⁶ atoms weighs 3720.9 g.

Any substance containing 6.02 × 10²³ atoms is called one mole of that substance. This number is called Avogadro number. Thus, one mole of every element contains Avogadro number of atoms.

Helium is second element in periodic table. Atomic mass of helium that is mass of one mole = 4 g

4 g contains 6.02 × 10²³ atoms. Then weight of He containing 5.6 × 10²⁶ atoms is calculated as follows:

no. of moles = 5.6 × 10²⁶/ 6.02 × 10²³ = 930.2

mass of 930.2 moles = 930.2 × 4 =3720.9 g

Therefore, the mass of He containing 5.6 × 10²⁶ atoms is 3720.9 g.

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K can be found in solid form. Water exists as a liquid. KOH can be found in aqueous form. Hydrogen exists as a gas.

Reactants are chemical compounds that engage in chemical reactions, resulting in the formation of new chemicals known as products. Products are the new compounds created as a result of the chemical reaction between reactants.

Reactant- The substances which participate in a chemical reaction, are called reactants. A chemical reaction describes the process by which atoms, the fundamental building blocks of matter, rearrange themselves to form new combinations. Reactants are raw materials that react with one another.

Product- A product is a substance that is present at the end of a chemical reaction. In the equation above, the zinc and sulfur are the reactants that chemically combine to form the zinc sulfide product.

Here,

K=solid

H₂O=liquid

KOH=aqueous

H₂=gas

K exist in solid form. H₂O exist in liquid form. KOH exist in aqueous form. H₂ exist in gas form.

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Answer:

95.211 g/mol

Explanation:

For example magensium chloride has the formula unit MgCl2 , i..e., for every magnesium cation there are two chloride anions in the crystal. Or, we would say that the formula weight of MgCl2 = 95.211 g/mol.

Answer:the equation is already balanced and the reactants are the C3H8+ 5 O2 and the products are 3CO2+ 4H2O

Explanation: