How many significant figures are in 1.009 L

Answer:

5.07×10^-2

Explanation:

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

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

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I would say traditional, command, market and mixed.

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Mind marking me brainliest. Thank you!

XYZ is the answer

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The correct order of increasing vapor pressure at STP for the liquids X, Y, and Z is Z, Y, X, because vapor pressure is inversely related to boiling point. Option B is correct.

The student has asked to arrange liquids X, Y, and Z in the correct order of increasing vapor pressure at Standard Temperature and Pressure (STP). Liquids boil when their vapor pressure becomes equal to the external pressure. As per the given information, the normal boiling point of X is less than that of Y, which is less than that of Z. It is known that the vapor pressure of a liquid is inversely related to its boiling point.

Therefore, the liquid with the lower boiling point will have a higher vapor pressure at a given temperature. Hence, since X has the lowest boiling point, followed by Y, then Z, the correct order of increasing vapor pressure at STP would be Z, Y, X.

Hence, B. is the correct option.

The complete question is:

The normal boiling point of liquid X is less than that of Y, which is less than that of Z. Which of the following is the correct order of increasing vapor pressure of the three liquids at STP?

A) X, Y, Z

B) Z, Y, X

C) Y, X, Z

D) X, Z, Y

E) Y, Z, X

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

Answer:

ionic

Explanation:

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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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.

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

hello there the answer is 6 H2O + 6 CO2 = C6H12O6 + 6 O2

Answer:

Photosynthesis

Explanation:

Density ρ=[tex]\frac{m}{v}[/tex]

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

Density = mass / volume

therefore, both mass and volume are needed

the first one represents volume

The Space it occupies is the answer

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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The density of a table tennis ball cannot be determined without knowing its mass and volume.

The density of a table tennis ball is the mass of the ball divided by its volume.

Since we do not have the mass or volume of the table tennis ball, we cannot calculate its density.

The density of an object is typically measured in grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³).

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Table tennis ball's density can't be provided directly without specific mass or volume data. However, it's generally understood to be less than water's density since it floats in water. You can measure the ball’s mass and volume yourself to calculate the density.

The density of an object can be calculated by dividing its mass by its volume. We don't have specific mass or volume values for a table tennis ball provided, so we cannot directly provide a density value. However, you can usually find this information on the ball packaging or from the manufacturer. Alternatively, you could calculate it yourself by measuring the mass of the ball using a scale, and the volume by displacement method in a liquid.

Remember, the unit of density is often expressed as grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³) depending upon the unit system being used. If we were to compare a table tennis ball generally to water, which has a density of 1 g/cm³, we could say that the table tennis ball has a much lower density because it floats on water.

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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

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

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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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Final answer:

The true statement is that protons and neutrons have approximately the same masses and different charges. Hence option 1- 'They have the same masses and different charges' is the correct answer.

Explanation:

The statement that is true about a proton and a neutron is that they have approximately the same masses and different charges. Both the proton and neutron have masses close to 1 atomic mass unit (amu), but they have different charges: the proton has a positive charge (+1), while the neutron is electrically neutral (0 charge).

Protons and neutrons, which reside in the nucleus of an atom, are considered the primary contributors to the atom's mass, as their mass is approximately 1836 times greater than that of an electron. Despite their similar masses, protons and neutrons differ significantly in their electric charge, which is crucial for understanding atomic structure and nuclear chemistry.

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.

Answer:

B. It was deliberately set!

Explanation:

Just took the test and it was right!

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.

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.

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.

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.

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.

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.

 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.

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: