what is a chemical change?

Al2(SO4)3 is the formula for one aluminum sulfate atom.

There is 4 oxygen atoms in one so in 3 they would have 12

12 Oxygen Atoms

Please mark brainliest which would help alot :3

Given:

Frequency (ν) = 319 THz

To determine:

The wavelength corresponding to the given frequency

Explanation:

Wavelength (λ) and Frequency(ν) are related as:

λ = c/ν

where c = speed of light = 3*10⁸ m/s

Now:

SI unit of frequency is Hertz (Hz) also expressed as cycles per second

i.e 1 Hz = 1 s⁻¹

1 Terahertz (THz) = 10¹² Hz

therefore the given frequency ν = 319 *10¹² s⁻¹

λ = 3 * 10⁸ ms⁻¹/319 *10¹² s⁻¹ = 940 * 10⁻⁹ m

since 1 nanometer (nm) = 10⁻⁹ m

The wavelength is λ = 940 nm

Ans: The infrared wavelength = 940 nm

480 nm

Explanation:

The key to any frequency and wavelength problem is the fact that frequency and wavelength have an inverse relationship described by the equation

Answer:

5.07×10^-2

Explanation:

in case they want it to be written out instead of the plain answer

Answer:

ionic

Explanation:

He discovered what became known as Dobereiner's triads.  For example he noticed that the average of the atomic mass of lithium and potassium was close to the atomic mass of sodium and they had similar properties.

The third choice is the correct one.

Answer:

He identified triads of elements that had similar properties.

Explanation:

He identified a group of there elements that have relatable physical properties such their atomic weight and density. For example in alkali metals such as lithium, sodium and potassium, the atomic weight of sodium is the arithmetic mean of the first and the third element. The same trend was observed with alkaline earth metals (calcium, strontium and barium), halogen (chlorine, bromine and iodine) and chalcogens (sulphur, selenium and tellurium).

In the reaction CH₄ + 2O₂ → CO₂ + 2H₂O, methane (CH₄) and oxygen (O₂) are the reactants, and carbon dioxide (CO₂) and water (H₂O) are the products. The number of molecules involved is indicated by the numbers in front of the chemical symbols.

In the chemical reaction CH₄ + 2O₂ ightarrow CO₂ + 2H₂O, the reactants are methane (CH₄) and oxygen (O₂), and the products are carbon dioxide (CO₂) and water (H₂O). The arrow signifies the direction in which the reaction proceeds, with the substances on the left side of the arrow being the reactants and the ones on the right side being the products. No reverse arrow is used, indicating the reaction is shown as proceeding in only one direction. The number '2' in front of O₂ and H₂O tells us that there are two molecules of oxygen and two molecules of water involved in the reaction, whereas no number in front of CH₄ and CO₂ indicates only one molecule of each is involved.

A covalent bond holds two atoms close together because electrons in their outermost orbitals are shared by both atoms.

There are two types of chemical compound one is covalent compound and another is ionic compound in chemistry. Therefore, a covalent bond holds two atoms close together because electrons in their outermost orbitals are shared by both atoms.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

Covalent compounds are formed by covalent bond and ionic compounds are formed by ionic bond. Covalent bond is formed by sharing of electron and ionic bond are formed by complete transfer of electron. Ionic bonds are stronger than covalent bonds.

The melting and boiling points are higher in ionic compounds. A covalent bond holds two atoms close together because electrons in their outermost orbitals are shared by both atoms.

Therefore, a covalent bond holds two atoms close together because electrons in their outermost orbitals are shared by both atoms.

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Answer:

The answer A.The product of a combustion reaction

Explanation:

A catalyst is the substance which helps in increasing the rate of a reaction without itself getting consumed in the reaction.

A catalyst changes the path of reaction so that molecules with lower energy can easily participate in the reaction. As a result, formation of products increases.

Thus, we can conclude that out of the given options, a catalyst is not used up in a reaction.

I belive it is thermal energy...

Answer:

The Correct Answer is B

Thermal energy

Explanation:

Answer: The correct order is :

Lavoisier, Dobereiner, Newlands, Mendeleev, and Moseley

Explanation:

In 1789, the Lavoisier given the periodic table distribution by placing the elements into two groups of metals and non metals.

In 1817, the Dobereiner attempted to classify elements in a periodic table by placing them group of three with similar chemical and physical properties. these groups were named as triads .

In 1864 , the Newlands classified total 62 elements into eight groups  according to their respective physical properties. And were also known as Law of Octaves.

In 1869, the Mendeleev classified the periodic table on the basis of atomic mass. In which elements were arranged in increasing order of their atomic masses.

In 1913,  Moseley classified the periodic table on the basis of increasing  number of protons in the elements.

Answer:

Number 2

Explanation:

From edge

c, 1A hope this helps

Answer:C

Explanation:

Alkali metals are those elements found in group 1A. They are the very first elements one encounters at the extreme left hand side of the periodic tab!e. They are extremely reactive and are the most electro positive of all the metals. They include; Li, Na, K Rb, Cs, Fr.

The ions are made up of atoms with an overall positive or negative charge as a result of electron gain or loss.

The formulas for various binary ionic compounds are what we wish to write down. To do this, we must take into account the octet's rule.

According to the octet's rule, atoms will either gain, lose, or share electrons to have the electron configuration of the nearby noble gas (8 valence electrons except for He with 2).

K will lose 1 electron to create K+ since it possesses 1 valence electron. I will gain 1 electron to produce I because it already has 7 valence electrons. KI is the neutral chemical that exists between K+ and I.

As Mg has two valence electrons, it must lose two of them to become [tex]Mg^{+2}[/tex] Cl and will gain 1 electron to produce Cl because it already has 7 valence electrons. [tex]MgCl_{2}[/tex]  is the neutral molecule between [tex]Mg^{+2}[/tex] and [tex]Cl^{-}[/tex].

Na will lose 1 electron to produce [tex]Na^{+}[/tex] since it possesses 1 valence electron. S will gain 2 electrons to create [tex]S^{-2}[/tex]because it has 6 valence electrons. [tex]Na^{2}S[/tex] is the neutral molecule that exists between [tex]Na^{+}[/tex]+ and [tex]S^{-2}[/tex].

Al will lose 3 electrons to create [tex]Al^{3+}[/tex] since it possesses 3 valence electrons. S will gain 2 electrons to create [tex]S^{-2}[/tex] because it has 6 valence electrons. [tex]Al^{2}S^{3}[/tex] is the neutral molecule that exists between [tex]Al^{3+}[/tex]and [tex]S^{-2}[/tex].

Al will lose 3 electrons to create[tex]Al^{3+}[/tex]  since it possesses 3 valence electrons. N will gain 3 electrons to become [tex]N^{3-}[/tex] because it has 5 valence electrons. [tex]AlN[/tex] is the neutral intermediate between [tex]Al^{3+}[/tex] and [tex]N^{3-}[/tex].

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The formulas for the binary ionic compounds are as follows: Potassium and iodine - KI, Magnesium and chlorine - MgCl2, Sodium and sulfur - Na2S, Aluminum and sulfur - Al2S3, Aluminum and nitrogen - AlN.

The formulas for binary ionic compounds formed between the given elements are as follows:

Remember that in these compounds, the metal (on the left in the periodic table) loses electrons to become a positive ion, and the non-metal (on the right in the periodic table) gains these electrons to form a negative ion. The compounds are therefore electrically neutral as a whole.

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Answer:

1-chloro-3-ethyl-2,2-dimethylheptane  

Step-by-step explanation:

Here are the rules for naming alkyl halides.

1. Find the longest continuous chain of carbon atoms (see image below).

There are two different seven-carbon chains.

2. If two or more chains are competing for selection as the main chain, select the one that has more substituents.

We choose the chain marked by the blue line .

3. Name the main chain.

The chain has seven C atoms, so its base name is heptane.

4. Identify and name all the substituents.

There are one Cl atom (chloro), two 1C groups (methyl),  and one 2C group(ethyl)

5. Number the main chain from the end closest to a substituent.

The C bearing the Cl atom becomes C-1.

5. Identify the substituents by the number of the C atom on the main chain (the locant). Use hyphens between letters and numbers (1-chloro, 2-methyl, 3-ethyl).

6. If there are two or more identical substituents, give the locant for each and use a multiplying prefix. Use commas between two numbers (2,2-dimethyl).

7. Put the names of the substituents with their locants in alphabetical order in front of the base name with no spaces.

The IUPAC name is 1-chloro-3-ethyl-2,2-dimethylheptane.

Cells are considered the fundamental units of life. The cells in complex multicellular organisms like people are organized into tissues, groups of similar cells that work together on a specific task. ... At each level of organization—cells, tissues, organs, and organ systems—structure is closely related to function.

Cells are the basic units of life that join together to form tissues, which in turn combine to form organs. These organs, working together, form organ systems and eventually, an organism. Understanding the relationships between cells, tissues, and organs is fundamental in studying biological structures.

Cells, tissues, and organs are closely related, as they form the building blocks of all organisms. Cells are the smallest unit of life, and in multicellular organisms, these cells of a similar kind interconnect with each other and perform shared functions to form tissues (for example, muscle tissue, connective tissue, and nervous tissue). Then, several tissues combine together to form an organ (like the heart, brain, or stomach) that carries out a specific function.

Organ systems, such as the circulatory or digestive system, are made up of several organs working in unison. These organ systems functioning together form an organism, like a human or an elephant. Understanding the structure and function of cells helps in the study of tissues, and similarly, understanding tissues aids in comprehending how organs function.

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d) are able to synthesize organic molecules from inorganic raw materials

Hope it helps

Maple trees and tulips are classified as autotrophs because D. are able to synthesize organic molecules from inorganic raw materials.

An autotroph refers to the organism that is able to produce its own food through the use of water, light, and carbon dioxide.

Due to the fact that autotrophs produce their food, they're called producers too. Autotrophs produce their food through the process of photosynthesis. Since maple trees and tulips are also able to synthesize organic molecules from inorganic raw materials, they are autotrophs.

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Answer : The incorrect option is, The most of the mass of the atom comes from the electron cloud.

Explanation :

There are three basic particles of an atom which are neutrons, protons and electrons.

The nucleus which is present in the center of an atom that contains the neutrons and the protons. The protons are positively charged and neutrons has no charge.

The outer region of an atom contains the electrons and the electrons are negatively charged.

As per given options, the statement which is the most of the mass of the atom comes from the electron cloud is incorrect statement because the most of the mass comes from the nucleus in which protons and neutrons are present.

A composition reaction produces a single substance from multiple reactants. A decomposition reaction produces multiple products from a single reactant.

Hope This Helped

I Believe it would be 46.005500

hoped this helped let me know if I'm wrong

Answer: The mass of nitrogen dioxide for given number of moles are 158.7 grams.

Explanation:

To calculate the mass for given number of moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]

We are given:

Moles of nitrogen dioxide = 3.45 moles

Molar mass of nitrogen dioxide = [tex][14+(2\times 16)]=46g/mol[/tex]

Putting values in above equation, we get:

[tex]3.45mol=\frac{\text{Mass of }NO_2}{46g/mol}\\\\\text{Mass of }NO_2=(3.45mol\times 46g/mol)=158.7g[/tex]

Hence, the mass of nitrogen dioxide for given number of moles are 158.7 grams.

In the first law of thermodynamics, it states when heat is converted into energy, where as the total energy in the room could transform into another but can never be created or destroyed. If you release 258J of energy in the room, 258J would also be removed from the food according to the isolating system.

Your answer would be 258J.

A substance in the solid phase (state) of matter has a definite shape and a definite volume.

Volume is the amount of space taken up by an object, while capacity is the measure of an object's ability to hold a substance, like a solid, a liquid or a gas. Volume is measured in cubic units, while capacity can be measured in almost every other unit, including litres, gallons, pounds, etc.

Matter in the solid-state maintains a fixed volume and shape, with component particles (atoms, molecules or ions) close together and fixed into place.

Hence, option A is correct.

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Answer:

A.

Covalent bonds would need to form between the molecules.

Explanation:

From edmentum

According to the polymerization reactions ,1-butene is transformed to polybutene by  formation of more covalent bonds between the molecules.

The reactions in which large number of monomer molecules react to form polymer are called polymerization reactions.The large molecules which are produced from polymerization may have linear or branched structure.

They can also form a complex three dimensional structure . There are different polymerization reactions like step-growth polymerization, chain -growth polymerization and condensation polymerization.

Polymers containing same kind of monomer are homopolymer and which contain different monomers are heteropolymers. Mechanisms which describe formation of polymers are of different types such as free radical mechanism and chain growth mechanisms.

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Heat is type of energy can be transferred in three different ways:

1) direction contact through collisions (also called conduction).  

Thermal conductuction is the transfer of heat through physical contact.

Thermal conduction is the transfer of heat by microscopic collisions of particles.

Heat spontaneously flows from a hotter (in this example hot liquid) to a colder body (in this example spoon).

2) through a fluid making a current created by less dense fluids floating and more dense fluids sinking (also called convection).  

Stirring hot liquid with spoon.

3) by waves traveling with or without a medium (also called radiation).

Waves radiate from hot liquid.

Heat is transferred through conduction, convection, and radiation, often occurring simultaneously. Conduction involves direct contact, convection is the movement of warm fluids, and radiation transfers energy via electromagnetic waves. These processes can be observed in a system like a fireplace, where all three mechanisms contribute to heat transfer.

In the context of heat transfer, conduction, convection, and radiation are three core mechanisms that allow energy to be transferred as heat. Whenever a temperature difference exists, these mechanisms facilitate the movement of heat.

In scenarios like a fireplace, these three methods of heat transfer are evident:

Answer:

Diatomic molecules are molecules made of two atoms. The atoms can be of the same element (diatomic elements) like in H2, N2, and O2, or of different elements (diatomic compounds) like in HCl, NaCl, and KBr.  

In contrast, monatomic elements consist of single atoms, like Ar, He and Ne.

 The  reaction  that is energy released  is exothermic  reactions (answer D)

  Explanation

Exothermic  reaction  is a chemical reaction  that releases energy  through heat or light.

Example  of exothermic reaction is   combustion reaction  such as  lighting a candle  which produces  carbon dioxide, water and heat.

 Endothermic reaction in  other  hand it  is  a chemical  reaction that  absorb energy  from the surrounding.

Density ρ=[tex]\frac{m}{v}[/tex]

=[tex]\frac{2.56 kg}{0.820 L} \\=3.121kg/L[/tex]

Answer:

B. It was deliberately set!

Explanation:

Just took the test and it was right!