Argon has an atomic number of 18 which means that it has 18 electrons. This means that it has a full outer shell. Therefore, it would not have to bond or share with other elements to gain or lose any more electrons since it is already stable.
help me with this please!!
heterogeneous mixtures are those that are mixed, but not evenly. so you can see the different parts. compound is something made up of 2 or more elements. so, K will be a compound, as they are giving you the chemical formula, and showing there are 2 elements. and L is the heterogeneous mixture, as, even though it is crushed, the rocks can be picked apart.
Investigating a fire scene, you determine several places where fires started. What might you guess about the cause of the fire?
A. It was an electrical fire
B.It was deliberately set
C. An accelerant was used
D. It was an accident
Answer:
B. It was deliberately set!
Explanation:
Just took the test and it was right!
0.820 L has a mass of 2.56kg what is the density of this liquid in kg/L
Density ρ=[tex]\frac{m}{v}[/tex]
=[tex]\frac{2.56 kg}{0.820 L} \\=3.121kg/L[/tex]
What is the correct chronological order of scientists contributing to the modern periodic table? Lavoisier, Newlands, Moseley, Dobereiner, and Mendeleev Lavoisier, Dobereiner, Newlands, Mendeleev, and Moseley Moseley, Mendeleev, Newlands, Dobereiner, and Lavoisier
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
which one of these reactions is energy released? A all reactions B no reactions C endothermic reactions D exothermic reactions
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.
determine the iupac name
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.
What was Johann Dobereiner’s contribution to the development of the periodic table?
He arranged the elements according to increasing atomic mass.
He arranged the elements according to increasing atomic number.
He identified triads of elements that had similar properties.
He organized elements into four groups based on their properties.
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).
a television remote control operates at 319 THz, what is the wavelength of the infrared light in nanometers?
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
I NEED HELP ASAP PLEASE
Which of the following represents the average kinetic energy of an object’s particles?
Potential energy
Thermal energy
Type of atoms in matter
Type of molecules in matter
I belive it is thermal energy...
Answer:
The Correct Answer is B
Thermal energy
Explanation:
CO2+ H2O --> C6 H12 O6 +O2
hello there the answer is 6 H2O + 6 CO2 = C6H12O6 + 6 O2
Answer:
Photosynthesis
Explanation:
Maple trees and tulips are classified as autotrophs because they both which
a) produce gametes by the process of mitosis
b) produce carbon dioxide and water as metabolic wastes
c) are able to obtain complex organic materials
d) are able to synthesize organic molecules from inorganic raw materials
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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If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 258J of energy to the room?
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.
whoch of the following statments doesnt describe the structure of a atowhich of the following do not describe the structure of an atom inside the nucleus of an atom are protons and neutrons protons are positively charged subatomic co-product electrons are negatively charged subatomic particles most of the mass of the atom comes from the electron cloud
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.
At catalyst is ______.
A. The product of a combustion reaction
B. Not used up in a reaction
C. One of the reactants in single-replacement reactions
D. A solid product of a reaction
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.
The compound 1-butene is modeled here. What would need to happen for molecules of this compound to transform into polybutene? A. Covalent bonds would need to form between the molecules. B. Each molecule would need to gain at least one oxygen atom. C. More double bonds would need to form in each molecule. D. Hydrogen atoms would need to be transferred between molecules.
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.
What are polymerization reactions?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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Which type of electromagnetic radiation has a lower frequency than infared radiation
PLS HELP
what is the charge of the nucleus? AND HOW DO YOU KNOW?
it’s all the same color with no labels so how do you know if it’s neutrons or protons
What is the molar mass of 3.45 moles of NO2
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.
Ascorbic acid, or vitamin C (C6H8O6, molar mass = 176 g/mol), is a naturally occurring organic compound with antioxidant properties. A healthy adult’s daily requirement of vitamin C is 70-90 mg. A sweet lime contains 2.88×10−4 mol of ascorbic acid. To determine whether the ascorbic acid in a sweet lime meets the daily requirement, calculate the mass of ascorbic acid in 2.88×10−4 mol of ascorbic acid.
Answer:
5.07×10^-2
Explanation:
in case they want it to be written out instead of the plain answer
explain how heat transfer is occurring through convection, radiation AND conduction in this picture.
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.
Explanation:Heat Transfer: Conduction, Convection, and RadiationIn 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.
Conduction: This type of heat transfer occurs through stationary matter by physical contact. For example, heat transferring from the burner of a stove through the bottom of a pan to the food is achieved by conduction.Convection: Convection involves the macroscopic movement of a fluid (either gas or liquid). Heat is carried by the fluid as it moves, such as in the case of hot water rising within a pot on a stove, allowing colder water to sink and get heated at the bottom, thus setting up a circulation pattern.Radiation: Radiation is the transfer of energy through electromagnetic waves without the need for a medium. An example is the heat we feel from the Sun, where the energy is transferred through the vacuum of space.In scenarios like a fireplace, these three methods of heat transfer are evident:
Heat radiates into the room, warming it up.The structure of the fireplace and the adjacent wall conduct heat into the room, albeit at a slower pace.Convection occurs as warm air rises and escapes up the chimney, drawing in colder air from the surrounding space, which then gets heated by the fire.How many atoms of oxygen are in three units of aluminum sulfate
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
In which of these ways can volcanoes help build up land?
What is the relationship between diatomic molecules and diatomic elements? Name One example of a diatomic element.
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.
What kind of bond is present in HCl
Answer:
ionic
Explanation:
which of the following for an object should be known to calculate its density
Density = mass / volume
therefore, both mass and volume are needed
the first one represents volume
The Space it occupies is the answer
what is a difference between a decomposition ans synthesis/combination reaction
A composition reaction produces a single substance from multiple reactants. A decomposition reaction produces multiple products from a single reactant.
Hope This Helped
How are electromagnetic waves affected as the frequency of the waves increases?
A) energy and wavelength increase
B) energy and wavelength decrease
C) energy decreases, wavelength increases
D) energy increases, wavelength decreases
As the frequency is how many waves pass a fixed point in certain amount of times. This means that the waves get closer together and, therefore, the wavelength decreases. It also means that the wave has more energy.
Answer: D) Energy increases, wavelength decreases
When the frequency of the waves increases, its energy increases, while the wavelength decreases.
• A travelling disturbance, which mediates energy from one place to another is known as a wave.
• The tendency to do work or cause a change is known as the energy.
• Waves can be determined with the help of frequency and wavelength.
• In a given unit of time, the number of complete wavelengths is known as frequency.
• With the increase of the size of wavelengths, its energy and frequency decreases.
• There are two basic kind of waves, that is, electromagnetic and mechanical waves.
• The waves, which can travel through a medium or a vacuum is known as the electromagnetic waves.
• The waves with long wavelengths comprise less energy than waves with short wavelengths.
Thus, correct answer is option d, that is, energy increases, wavelength decreases.
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Identify the reactant and product in tge following chemical reaction: CH4 + 2O2 ➡ CO2 + 2H2O
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 certain skin lotion is a fine mixture of water and various oils. this lotion is cloudy and cannot be separated into oil and water by filtration. moreover, it’s compon do not separate when left standing. what type of mixture is it
Final answer:
The lotion is a colloid, which is a stable mixture of water and oils that remains consistent without separation and exhibits the Tyndall effect.
Explanation:
The skin lotion described is a type of mixture known as a colloid. In this colloid, the water and oils do not separate upon standing, nor can they be easily filtered apart. The mixture is cloudy because the particles are large enough to scatter light, which is also known as the Tyndall effect. Typical lotions are oil-in-water emulsions that use substances to keep the mixture consistent without separation. Despite the presence of water and oils, which are generally immiscible, the formulation of lotions ensures that they remain stable and homogenous through the use of emulsifiers.
Write formulas for the binary ionic compounds formed between the following elements: a. Potassium and iodine b. Magnesium and chlorine c. Sodium and sulfur d. Aluminum and sulfur e. Aluminum and nitrogen
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).
Potassium and iodine - KIK 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.
Magnesium and chlorine - [tex]MgCL_{2}[/tex]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].
Sodium and sulfur - [tex]NA_{2}S[/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].
Aluminum and sulfur - [tex]Al^{2}S^{3}[/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].
Aluminum and nitrogen - [tex]AlN[/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.
Explanation:The formulas for binary ionic compounds formed between the given elements are as follows:
Potassium and iodine: When these two elements form a binary ionic compound, the outcome is Potassium iodide. The formula for this is KI. Magnesium and chlorine: The binary ionic compound resulting from Magnesium and Chlorine interaction is Magnesium chloride, represented as MgCl2. Sodium and sulfur: The combination of Sodium and Sulfur results in Sodium sulfide. This is abbreviated as Na2S. Aluminum and sulfur: When Aluminum and sulfur join to form a binary ionic compound, the result is Aluminum sulfide, written as Al2S3. Aluminum and nitrogen: The binary ionic compound formed by Aluminum and Nitrogen is Aluminum Nitride. Its formula is AlN.
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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