What is the Fraction Remaining of a sample that is 5 half lives old?

Answer:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.

Explanation:

To balance the equation, you should apply the law of conservation of mass for the equations.

The law of conservation of mass states that the no. of each atom is equal in both sides (reactants and products).

Hydrocarbon is burned in oxygen to produce CO₂ and H₂O.

So, the given equation is balanced as:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.

that 1.0 mole of C₃H₈ is burned in 5.0 moles of O₂ to produce 3.0 moles of CO₂ and 4.0 moles of H₂O.

The no. of all atoms is the same in both of reactants and products side.

C (3), O (10), and H (8).

Answer:  The correct answer is:  [B]:

_________________________________________________

                         " organic acid and amines " .

_________________________________________________

Note:  Choice B:  "organic acid and amines" ;

            is the only answer choice that contains "amines" (hint: amino acid / amine) ;  which are "proteins" .

           As such;  Choice "B" is the only  correct answer choice.

_____________________________________________________

Hope this helps!

    Best wishes to you!

_____________________________________________________

Answer: option B

Explanation:

Amino acids have both COOH and NH2 groups.

Example, Glycine -NH2CH2COOH

Hence amino acids are the combination of organic acids and amine.

Amino acids are building blocks of proteins.

Answer:

[tex]\boxed{\text{fertilizer, wallboard, and plaster of Paris}}[/tex]

Explanation:

There are three uses of gypsum in your list.  

1. Fertilizer

Gypsum is a source of the essential plant nutrients, Ca and S. It has been used as a fertilizer for more than 250 yr.

2. Wallboard

Much of the gypsum produced by flue gas desulfurization is used in the wallboard industry.

3. Plaster of Paris

Plaster of Paris is produced by heating gypsum to about 150 °C.  

CaSO₄·2H2O ⟶ CaSO₄·0.5H₂O + 1.5H₂O

When the dry powder is mixed with water, it re-forms into gypsum.

So, three uses of gypsum are in [tex]\boxed{\textbf{fertilizer, wallboard, and plaster of Paris}}[/tex].

The two uses of gypsum are Wallboard and  Plaster of Paris.

Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO₄·2H₂O.

There are two uses of gypsum are as follows:

1. Wallboard

Due to its inherent fire resistance, gypsum board, commonly known as drywall is the premier building material for wall, ceiling, and partition systems.

2. Plaster of Paris

Plaster of Paris is produced by heating gypsum to about 150 °C.  

CaSO₄·2H2O ⟶ CaSO₄·0.5H₂O + 1.5H₂O

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Answer:

The silicates

Explanation:

The silicates are the most common mineral groups on the earth crust. They account for a bulk 90% of all rocks and earth materials we find on our thin crust.

The silicates are made of the fundamental unit which is the SiO₄⁴⁻ tetrahedron. This forms the basic unit through which other elements combine with them. The silicates makes up the bulk of sands we have as silica.

The tetrahedron makes silicates unique and able to combine readily with other elements to form a wide range of minerals.

Most rocks found on the earth surface and in the crust are for their most parts made up of silicate minerals. Some of these minerals are olivine, quartz, beryl, phlogopite, feldspars etc.

Coefficients or reactants and products from the balanced chemical equation of a reaction at equilibrium appear as a coefficient.

Answer:

3.762 atm.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R  is the general gas constant,

T is the temperature of the gas in K.

(P₁V₁) = (P₂V₂)

P₁ = 894.0 torr, V₁ = 534.0 mL,

P₂ = ??? torr, V₂ = 167.0 mL.

(P₁V₁) = (P₂V₂)

∴ P₂ = (P₁V₁)/V₂ = (894.0 torr)(534.0 mL)/(167.0 mL) = 2859 torr.

1.0 atm = 760.0 torr.

∴ P₂ = (2859 torr)(1.0 atm/760 torr) = 3.762 atm.

Answer:

[tex]\boxed{\text{4.5 m}^{3}}[/tex]

Explanation:

Step 1. Calculate the volume of gasoline used.

[tex]V = \text{235 mi} \times \dfrac{\text{1 gal}}{\text{31.2 mi}} \times \dfrac{\text{3.875 L}}{\text{1 gal}} = \text{28.51 L}[/tex]

Step 2. Calculate the moles of octane used.

[tex]n = \text{28.51 L} \times \dfrac{\text{1000 mL}}{\text{1 L}} \times \dfrac{\text{0.71 g}}{\text{1 mL}} \times \dfrac{\text{1 mol}}{\text{114.23 g}} = \text{177 mol}[/tex]

Step 3. Calculate the moles of CO₂ formed

            C₈H₈ + 10O₂ ⟶ 8CO₂ + 4H₂O

n/mol:   177

[tex]n = \text{177 mol C$_8$H$_8$} \times \dfrac{\text{8 mol CO$_2$}}{\text{1 mol C$_8$H$_8$}} = \text{1420 mol CO$_2$}[/tex]

Step 4. Calculate the volume of CO₂

[tex]p =\text{732 torr} \times \dfrac{\text{1 atm}}{\text{760 torr}} = \text{0.9632 atm}[/tex]

R = 0.082 06 L·atm·K⁻¹mol⁻¹

T = 28 °C = 301.15 K

[tex]pV = nRT\\\\V = \dfrac{nRT}{p}\\\\V =\dfrac{177 \times 0.08206 \times 301.15}{0.9632} = \text{4500 L = 4.5 m}^{3}\\\\\text{The volume of CO$_2$ released is }\boxed{\textbf{4.5 m}^{\mathbf{3}}}[/tex]

Strong chemical bonds are the intramolecular forces that hold atoms together in molecules. A strong chemical bond is formed from the transfer or sharing of electrons between atomic centers and relies on the electrostatic attraction between the protons in nuclei and the electrons in the orbitals.

mark me brainliest please!

The atoms are primarily held together by strong nuclear forces and electromagnetism. The strong nuclear force binds the particles in the nucleus, while electromagnetism acts on a larger scale, holding atoms together, especially in covalent bonds. Other forces like dispersion forces also play a role when molecules are very close.

Atoms are held together by a few different forces, with the main two being the strong nuclear force and electromagnetism. The strong nuclear force keeps the particles of the nucleus, the nucleons, tightly bound together. This force is very strong, but it falls to zero over a distance of only 10-¹5 meters.

On the other hand, electromagnetism, which includes both magnetic and electrical forces, holds the atoms together at a larger scale. These forces occur between the positive charge of the atomic nucleus and the negatively charged electrons surrounding it. This is especially evident in covalent bonds where pairs of atoms share electrons.

Another type of force, although weaker, are dispersion forces that develop between atoms in different molecules when the molecules are very close.

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Answer:

191.4 g.

Explanation:

Fe₂O₃(s) + 3CO(g) → 2Fe(s) + 3CO₂(g),

It is clear that 1.0 mole of Fe₂O₃ react with 3.0 mole of CO to produce 2.0 moles of Fe and 3.0 moles of CO₂.

Using cross multiplication:

2.0 mol of Fe produced with → 3.0 mol of CO₂, from stichiometry.

2.9 mol of Fe produced with → ??? mol of CO₂.

∴ The no. of moles of CO₂ produced = (3.0 mol)(2.9 mol)/(2.0 mol) = 4.35 mol.

∴ The mass of CO₂ produced = no. of moles x molar mass = (4.35 mol)(44.0 g/mol) = 191.4 g.

Answer:

to explore the Kupier Belt

Explanation:

just finished the test

Goal of the planned mission MIRI is "to explore the Kupier Belt".

Explanation:

MIRI, Mid-infrared Instrument, was designed to play an important role in NASA's "James Webb Space Telescope"(JWST).This is a joint project involving the Space Agency  Europe and Canada. This telescope is designed to bring the images of stars and galaxies in infrared light. This grasps a wavelength of  5 to 28 microns. It also has a sensitive dectector allowing to see the red shifted light, stars that are newly formed and the comet that are blur.

Also, to explore the Kuiper belt that is located in the outer solar system that extends from the Neptune to sun. It is believed to be similar to  asteroid belt but 20 times broad and 200 times massive than it.  

D. Neutron-emitting material

Answer: The correct answer is Option D.

Explanation:

Nuclear control rods are defined as the rods which are used in nuclear reactor plants to control the fission rate of uranium and plutonium.

These rods are made up of few chemical elements like boron, silver, indium and cadmium. These rods have the capability of absorbing many neutrons without getting fissioned itself.

Thus, from the above information, the correct answer comes out to be Option D.

Answer:

0.058 M

Explanation:

HBr reacts with NaOH and forms NaBr and H₂O as the products. The balanced equation is as follows:

[tex]NaOH + HBr \implies NaBr + H_2O[/tex]

Molarity (M) = moles of solute (mol) / volume of the solution (L)

Molarity of NaOH =  0.115 M

Volume of NaOH = 18.2 mL = 18.2 x 10⁻³ L

So, moles of NaOH = molarity x volume of the solution

= 0.115 M x 18.2 x 10⁻³ L

= 2.093 x 10⁻³ mol

From the equation, we can see that the ratio between NaOH and HBr is 1 : 1.

Therefore,  moles of HBr in 35.6 mL = moles of NaOH added  =  2.093 x 10⁻³ mol

Hence, molarity of HBr = 2.093 x 10⁻³ mol / 35.6 x 10⁻³ L = 0.058 M

0.0588

This is what I got, and my online school curriculum said it was correct.

Answer:

Explanation:

Too many protons causes the nucleus to be unstable, thus making the isotope radioactive

Answer:

D. sulfur dioxide and nitrogen oxides dissolve in rainwater

Explanation:

Sulfur dioxide and nitrogen oxides are by products of fossil fuel combustion. The bulk of these gases are released into the atmosphere. When these gases gets to the atmosphere, they combine with rain water to form acid rain.

The oxides, sulfur dioxde and nitrogen oxides are non-metallic oxides. They are acid oxides that combines with water to produce an acid.

Burning of fossil fuels release these gases and they combine with rain water to form acid rain.

Acid rain is very corrosive and greatly affects the ecosystem.

Answer:

0.29mol/L or 0.29moldm⁻³

Explanation:

Given parameters:

Mass of MgSO₄ = 122g

Volume of solution = 3.5L

Molarity is simply the concentration of substances in a solution.

Molarity = number of moles/ Volume

>>>>To calculate the Molarity of MgSO₄ we find the number of moles using the mass of MgSO₄ given.

Number of moles = mass/ molar mass

Molar mass of MgSO₄:

Atomic masses: Mg = 24g

S = 32g

O = 16g

Molar mass of MgSO₄ = [24 + 32 + (16x4)]g/mol

= (24 + 32 + 64)g/mol

= 120g/mol

Number of moles = 122/120 = 1.02mol

>>>> From the given number of moles we can evaluate the Molarity using this equation:

Molarity = number of moles/ Volume

Molarity of MgSO₄ = 1.02mol/3.5L

= 0.29mol/L

IL = 1dm³

The Molarity of MgSO₄ = 0.29moldm⁻³

Answer:

20.27 g.

Explanation:

2AlCl₃ + 3Br₂ → 3AlBr₃ + 2Cl₂,

2.0 mole of AlCl₃ reacts with 3.0 moles of Br₂ to produce 3.0 mole of AlBr₃, and 2.0 mole of Cl₂.

no. of moles of AlCl₃ = mass/molar mass = (84.2 g)/(133.34 g/mol) = 0.6315 mol.

no. of moles of Br₂ = mass/molar mass = (68.4 g)/(159.808 g/mol) = 0.4288 mol.

AlCl₃ reacts with Br₂ with (2: 3) molar ratio,

So, 0.2859 mole (the remaining is in excess) reacts completely with 0.4288 mole of Br₂.

Using cross multiplication:

2.0 moles of AlCl₃ produce → 2.0 moles of Cl₂.

∴ 0.2859 mole of AlCl₃ produce → 0.2859 mole of Cl₂.

∴ The amount of Cl₂ produced = no. of moles x molar mass = (0.2859 mol)(70.906 g/mol) = 20.27 g.

Final answer:

To determine the amount of chlorine produced from 84.2 grams of aluminum chloride and 68.4 grams of bromine, we calculate that approximately 20.56 grams of chlorine gas would be produced, considering bromine as the limiting reactant.

Explanation:

The question: How much chlorine should be produced if 84.2 grams of aluminum chloride and 68.4 grams of bromine are combined? Firstly, we need to convert the mass of the reactants to moles using their molar mass. The molar mass of aluminum chloride (AlCl₃) is approximately 133.34 g/mol and that of bromine (Br₂) is about 159.808 g/mol. Therefore, 84.2 grams of AlCl₃ equals 0.63 mol and 68.4 grams of Br₂ equals 0.43 mol.

According to the balanced chemical equation 2AlCl₃ + 3Br₂ → 3AlBr₃ + 2Cl₂, two moles of AlCl₃ react with three moles of Br₂ to produce two moles of Cl₂. Thus, the theoretical yield of Cl₂ can be determined based on the limiting reactant. Given the ratio, Br₂ is the limiting reactant as it would require 0.84 moles of AlCl₃ to fully react with 0.43 moles of Br₂. Since 0.43 moles of Br₂ only reacts with 0.29 moles of AlCl₃ to produce chlorine, by the stoichiometry of the reaction, this would yield 0.29 moles of Cl₂.

The mass of Cl₂ produced can then be calculated as mass = moles × molar mass of Cl₂ (70.90 g/mol), giving approximately 20.56 grams of chlorine gas. This estimation provides an understanding of stoichiometry and the limiting reactant concept in chemical reactions.

Answer:

It provides energy for the reaction.

Explanation: gradpoint

UV light provides the necessary energy to initiate the halogenation reaction between an alkane and a halogen by causing the homolysis of halogen molecules, enabling the formation of halocarbons like methyl chloride.

An alkane reacts with a halogen to form a halocarbon, and the role of UV light in this reaction is to provide energy for the reaction. This is necessary because the initiation step in the halogenation of alkanes involves the homolysis of halogen molecules like chlorine (Cl₂) into two reactive chlorine radicals. The energy from UV light is enough to overcome the energy barrier for this bond cleavage, allowing the reaction to proceed. In the absence of UV light, the mixture of an alkane such as methane (CH₄) and chlorine will not react at room temperature. During the reaction, for instance, chlorine reacts with excess methane to give methyl chloride (CH₃Cl), and the presence of ultraviolet light is crucial for this transformation to take place.

Answer:

87.27 grams

Explanation:

The mole ratio of nitrogen to hydrogen is 1:3; while that one of hydrogen to the products (ammonia) is 3:2

Thus if 3 moles of hydrogen gas produce 2 moles of ammonia gas

7.7 moles of hydrogen will produce:

(7.7moles×2)/3

77/15 moles

1 mole of ammonia gas has a mass of  14+3=17

since the mass of an atom of nitrogen is 14 while that of hydrogen atom is 1.

Therefore 77/15 moles will have a mass of

77/15 moles × 17=87.27 grams

Neon has atomic mass of 20

Answer:

they are right its neon but i have the same questions so just search up "neon bohr modle" so you know which answer it is.

Explanation:

Metals- • Lustrous (shiny)

• Good conductors of heat and electricity.

• High melting point.

• High density (heavy for their size)

• Malleable (can be hammered)

• Ductile (can be drawn into wires)

• Usually solid at room temperature (an exception is mercury)

• Opaque as a thin sheet (can't see through metals)

Non-metal- • High ionization energies.

• High electronegativities.

• Poor thermal conductors.

• Poor electrical conductors.

• Brittle solids—not malleable or ductile.

• Little or no metallic luster.

• Gain electrons easily.

• Dull, not metallic-shiny, although they may be colorful.

Metalloid-Are generally solids

Metals are lustrous, malleable, ductile, good conductors of heat and electricity,Non-metals are brittle, dull, and poor conductors of heat and electricity,Metalloids they are shiny, brittle solids with intermediate to relatively good electrical conductivity and the electronic band structure of a semimetal or semiconductor.

Metals are lustrous, malleable, ductile, good conductors of heat and electricity,Non-metals are brittle, dull, and poor conductors of heat and electricity,Metalloids they are shiny, brittle solids with intermediate to relatively good electrical conductivity and the electronic band structure of a semimetal or semiconductor.

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Homogenous mixtures are known as solutions. Option A

Homogeneous mixtures are indeed known as solutions. In a homogeneous mixture, the components are uniformly distributed, creating a single-phase system.

This means that the composition of the mixture is uniform throughout, and there are no visible boundaries between the different components. Solutions can exist in various states of matter, including liquids, gases, and solids, depending on the nature of the substances involved.

Option B is incorrect because homogeneous mixtures consist of a single phase, not multiple phases.

Option C is incorrect because the composition of homogeneous mixtures can vary, although it remains uniform at any given point within the mixture.

Option D is incorrect because homogeneous mixtures can exist in different states, not just as liquids.

The full question: Which of the following is true about homogeneous mixtures

A. They are known as solutions

B. The consist of two or more phases

C. They have compositions that never vary

D. They are always liquids.

Answer:

D. Period

Explanation:

In the periodic table, elements are arranged by rows and columns. Rows are called periods, and columns are called groups. If you look at the periodic table below, you will see that Oxygen, Carbon, and Nitrogen are all in separate columns, so they are not in the same group. However, when you look at them by row, they fall in the same line. This means that they belong in the same period.

They fall in period 2.

Final answer:

Carbon, nitrogen, and oxygen are all elements found in the same period (period 2) (option D) on the periodic table, as they are all located in the second row from the top.

Explanation:

The elements carbon, nitrogen, and oxygen are all part of the same period on the periodic table. These elements are found in period 2 because they are in the second row, which is numbered according to the increasing atomic number from left to right. The periodic table is structured with horizontal rows known as periods and vertical columns known as groups. Elements in the same period have the same number of electron shells, which is why carbon, nitrogen, and oxygen can be found together in period 2, despite having different group numbers.

For the question asked, the correct answer is D) period. Knowing the arrangement of the periodic table helps in understanding how the periodicity of the elements influences their chemical properties and behavior in reactions. Oxygen, for instance, belongs to Group 16 (6A), which indicates that it has six valence electrons, like the other elements in that group, as do carbon in Group 14 (4A) and nitrogen in Group 15 (5A).

Answer:

[tex]CaF_{2}[/tex]

Explanation:

Calcium = Ca

Fluorine = F

Answer:

CaF2

Explanation:

Answer:

Pentane

Explanation:

1. The simplest alkane is the gas methane, whose molecular formula is CH4. Methane exists as a tetrahedral shape, but it is often represented by a flattened structure as are most organic compounds.

Two four-carbon alkanes are known, and they have measurably different chemical and physical properties.  Their structures are H3CCH2CH2CH3 and H3CCH(CH3)2.  Therefore they were named normal butane, often abbreviated as n-butane, and isobutane.  The straight-chain form is considered the "normal" form.  Alternatively, they could be named using the systematic IUPAC method as 1-methylpropane and 2-methylpropane, or even as butane and 2-methylpropane.  The IUPAC method names the longest straight carbon chain in the usual way and then numbers the carbons; the location of a substituent group is given by the number of its carbon.  The IUPAC method is always used for more complicated molecules, but many of the simpler ones still use non-systematic names, called trivial names, because these are less cumbersome to use.

2 . Unsaturated hydrocarbons are hydrocarbons that have double or triple covalent bonds between adjacent carbon atoms. The term "unsaturated" means more hydrogen atoms may added to the hydrocarbon to make it saturated: consisting all single bonds.

Dont know 3. Sorry!

Answer:

The pendulum would stop swinging because the kinetic energy would slow down for the friction is causing it to slow. The energy would go into potential energy.

Answer:

friction/heat

Explanation:

the pendulum would eventually stop swinging dude to friction in the air. the friction makes heat even if it is the smallest amount it is still energy. the pendulum would eventually stop due to friction which makes heat

Answer:

The right choice is → a reduction reaction

Explanation:

From the balanced equation

we can calculate the change in oxidation number of Cl in reactant and product

in reactant ClO⁻

let x= oxidation number of Cl

and oxidation number of oxygen in its compound is (-2)

and the total charge on the ClO⁻ ion = -1

in product Cl⁻

let x= oxidation number of Cl

and the total charge on the Cl⁻ ion = -1

so the oxidation number of Cl decreases from +1 in reactant to -1 in product so it is reduction reaction.

But, disproportionation reaction is defined as the chemical reaction in which a single substance gets reduced as well as oxidized.

For a disproportionated substance  , it should contain at least three oxidation states. which isn't the case here.

So, the right choice is:

→ a reduction reaction

Answer:

disproportionation reaction

Explanation:

Answer:

[tex]\boxed{2000}[/tex]

Explanation:

[tex]\text{4 quarters = \$1}\\\\\text{No. of quarters} = \text{\$500} \times \dfrac{\text{4 quarters}}{\text{\$1}} = \boxed{\textbf{2000 quarters}}[/tex]

Final answer:

The scientific method is a structured process used by scientists to explore observations by proposing questions, forming hypotheses, testing them through experiments, and analyzing results to form conclusions.

Explanation:

The scientific method is a process scientists use to understand the world. It consists of several steps:

If the hypothesis is supported, it may become a theory. If not, the hypothesis can be revised or a new one can be proposed. This process is cyclical, not linear, because it often leads to new questions and additional experiments.

At its core, the scientific method is about testing ideas with evidence. Good hypotheses should be testable and predictions made from these should be verifiable through experiments. The scientific method is not a rigid formula, but a flexible process that can adapt as new observations and technologies emerge.

Using the periodic table, find the molar mass of each compound in CaCO3

CA = 40

C = 12

O = 16

Molecular Mass = 40 + 12 + (16 x3) = 100 grams.

Number of moles = given mass / molecular mass

Number of moles = 240 g / 100g = 2.4 moles