3. How many grams of oxygen are needed for the
complete combustion of 11 grams of propane, C3H8?
C3H8 + 5 O2 + 3 CO2 + 4 H2O

The correct answer is [b] calcium is the metal that is produced by electrolysis of its molten chloride salt.

Metals are the opaque, lustrous elements that are good conductors of heat and electricity. Most metals are malleable and ductile and are, in general, denser than other elemental substances

Any of various opaque, fusible, ductile, and typically lustrous substances that are the good conductors of electricity and heat, form cations by loss of electrons, and yield basic oxides and hydroxides especially :the one that is a chemical element as distinguished from an alloy.

A metal may be a chemical element such as iron; an alloy such as stainless steel; or molecular compound such as polymeric sulfur nitride.

In physics, a metal is generally regarded as any substance capable of conducting the electricity at a temperature of absolute zero. Many elements and compounds that are not normally classified as metals become metallic under the high pressures.

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Answer:

\({ \tt{k _{c} = \frac{[Na_{2} O _{2} ]}{[Na] {}^{2} [O _{2} ]} }}\)

The independent variable when comparing the boiling point of substances having different intermolecular forces is the intermolecular forces of various substances (Option a).

The expression 'intermolecular forces' make reference to the bonds that bind different atoms in macromolecular structures and thus also serves to shape the form of macromolecules.

In conclusion, the independent variable when comparing the boiling point of substances having different intermolecular forces is the intermolecular forces of various substances (Option a).

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So some options can be different, in that case it would be  

The intermolecular forces of various substances

Option 2:

Compounds made of either ions, atoms, or molecules

The ratio strength (w/v) of the diluted solution is 1:1000 or 0.1% w/v.

The original solution is a 1:20 w/v solution, which means that for every 1 gram of solute, there is 20 mL of solution. Using this information, we can calculate the amount of solute in the original 50 mL of solution:

1 gram / 20 mL = x grams / 50 mL

x = 2.5 grams of solute

When this 50 mL of solution is diluted to 1000 mL, the amount of solute remains the same, but the volume of the solution increases. The new ratio can be calculated by dividing the weight of the solute by the volume of the solution:

2.5 grams / 1000 mL = 0.0025 grams/mL

Converting this to a percentage w/v:

0.0025 grams/mL x 100 = 0.25% w/v

Therefore, the ratio strength is 1:1000 or 0.1% w/v.

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Answer: D or

X

Y

Z

Explanation:

Answer: the answer should be B

Explanation:

The scientists are most likely studying precipitation (Option D).

In meteorology, precipitation is any result of atmospheric water vapor condensation that falls under the gravitational attraction of clouds. Drizzle, rain, sleet, snow, ice pellets, graupel, and hail are the most common types of precipitation.

Rain gauges and snow gauges are two forms of precipitation measuring instruments, and several versions are created depending on the use. This chapter discusses rain gauges. Rain gauges are divided into two types: recording and non-recording.

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There are several definitions of acids and bases, and each definition provides a unique perspective on their properties and behaviors.

Arrhenius Definition:

According to the Arrhenius definition, an acid is a substance that dissociates in water to form hydrogen ions (H+), while a base is a substance that dissociates in water to form hydroxide ions (OH-).

For example, hydrochloric acid (HCl) dissociates in water to form H+ and Cl- ions:

HCl → H+ + Cl-

On the other hand, sodium hydroxide (NaOH) dissociates in water to form Na+ and OH- ions:

NaOH → Na+ + OH-

Characteristics for identification:

Acids typically have a sour taste and can cause a burning sensation on the skin. Bases have a bitter taste and can feel slippery to the touch. They also typically have a higher pH value (greater than 7) in aqueous solutions.

Bronsted-Lowry Definition:

According to the Bronsted-Lowry definition, an acid is a substance that donates a proton (H+) to another molecule or ion, while a base is a substance that accepts a proton (H+) from another molecule or ion.

In this reaction, acetic acid is the acid because it donates a proton, while water is the base because it accepts a proton.

Characteristics for identification:

Acids and bases in the Bronsted-Lowry sense are identified by the presence or absence of a hydrogen ion. An acid must contain a hydrogen ion that can be donated to a base, while a base must have an available lone pair of electrons to accept a hydrogen ion.

Lewis Definition:

According to the Lewis definition, an acid is a substance that accepts a pair of electrons, while a base is a substance that donates a pair of electrons.

In this reaction, boron trifluoride is the acid because it accepts a pair of electrons, while ammonia is the base because it donates a pair of electrons.

Characteristics for identification:

Acids and bases in the Lewis sense are identified by their electron-pair accepting or donating abilities. An acid must be able to accept a pair of electrons, while a base must be able to donate a pair of electrons.

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Correct Question:

Explain the different definitions of acid and base. Give an example of each and the characteristics of your identification.

The molar mass of sulfur is 32.07 g/mol.

The mole is the amount of substance in a system that contains as many elementary entities as there are atoms in 0.012 kilogramme of carbon 12; its symbol is "mol".

A mole is defined as the amount of a substance that contains exactly. 02214076 X 10 23 of the substance's elementary entities. A mole is the mass of a substance that has the same number of fundamental units as there are atoms in precisely 12.000 g of 12C.

In chemistry, a mole is a standard scientific unit for measuring large amounts of very small entities such as atoms, molecules, or other specified particles. Related Terms: atom, matter, and molecular weight Avogadro's formula.

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Answer:

1,270 cm

Explanation:

100 g (cm^3/7.874 g)(m/cm^3)(100cm/m)

= 1270 cm

Answer: 0.065

Explanation:

When you turn the transmitter so that charges move in a east-west direction, the polarization of the resulting electromagnetic waves will change.

Polarization is the orientation of the electric field vector of an electromagnetic wave. In electromagnetic wave generated by north-south current in a wire, electric field vector will be oriented in an east-west direction. If the current in the wire is moving in east-west direction, the electric field vector of resulting electromagnetic wave will be oriented in a north-south direction.

So, if you change the direction of electric charges in the wire,  polarization of the resulting electromagnetic waves will change.

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A period is a horizontal row of the periodic table. There are seven periods in the periodic table, with each one beginning at the far left. ... A group is a vertical column of the periodic table, based on the organization of the outer shell electrons. There are a total of 18 groups.

Answer:

001: 71.2 g per ML

002: Consider a block of marble that occupies 287 cm3 and has a mass of 869 g.

a. What is its density?

d=m/v=869g/287 cm3=3.03 g/cm3

b. Will it float in:

H2O(l)? Why or why not?

Nope! Density > 1.00 g/mL

Hg(l) (density=13.55 g/mL)? Why or why not?

Yep! Density < 13.55 g/mL

003:  

Use the given functions to set up and simplify  

0.309 cm3

g/cm3=g/cm3

0.309cm3=g/cm3

Explanation:

http://childschemistry.weebly.com/uploads/7/8/6/3/78638416/density_key.pdf

Hope this helps I tried my best

Answer:

Element.

Explanation:

Aluminum is an element because it is not separable into simpler substances. One thing important to keep in mind is that if something is on the Periodic Table of Elements, it is 100% an element.

Hydrogen peroxide and water both contain the same two elements. The chemical formulas of hydrogen peroxide and water are respectively H2O2 and H2O. The two compounds have distinct physical and chemical properties. Here is a long answer to the question posed.

Water is a colorless, odorless, and tasteless liquid that is vital for life. Its melting point is 0 degrees Celsius, while its boiling point is 100 degrees Celsius. Water is the most prevalent chemical substance on Earth, with about 71% of the planet's surface covered by it.

Hydrogen peroxide is a pale blue liquid that is slightly more viscous than water. It has a bitter taste, and its odor is similar to that of bleach. The boiling point of hydrogen peroxide is 150.2°C, while the melting point is -0.43°C. Hydrogen peroxide is a powerful oxidizer that is commonly used as a bleaching agent, disinfectant, and antiseptic.


Chemical formulas are utilized in a variety of scientific applications, including chemical reactions and product descriptions. An incorrect chemical formula can have significant ramifications, potentially resulting in the formation of a hazardous substance.

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The pressure of the gas in the cylinder is 151.12 atm and 114,899.2 torr.

The pressure of a gas in a cylinder can be expressed in different units.

To convert the given pressure of 15.32 MPa to atmospheres (atm) and torr, we can use the following conversion factors:

1 atmosphere (atm) = 101.325

kilopascals (kPa) = 760 torr

First, we convert megapascals (MPa) to kilopascals (kPa) by multiplying by 1000.

Thus, 15.32 MPa is equal to 15.32 × 1000 = 15,320 kPa.

Next, we convert kilopascals to atmospheres by dividing by the conversion factor of 101.325 kPa/atm.

Thus, 15,320 kPa ÷ 101.325 kPa/atm = 151.12 atm.

Finally, to convert atmospheres to torr, we multiply by the conversion factor of 760 torr/atm.

Thus, 151.12 atm × 760 torr/atm = 114,899.2 torr.

Therefore, the pressure of the gas in the cylinder is approximately 151.12 atm and 114,899.2 torr.

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Chlorobenzene can be converted into benzoic acid using Grignard reagent. Thus, treating with Mg metal in dry ether followed by carboxylation and then hydrolyising the product gives benzoic acid.

Grignard reagents are alkyl magnesium halides with the general formula RMgX. They can be prepared by treating alkyl halides with Mg metal in presence of dry ether.

Chlorobenzene when treated with Mg gives MgCl substituted benzene ring which upon carboxylation using carbon dioxide followed by hydrolysis gives benzoic acid.

Therefore, the reagents needed for the conversion of chlorobenzene to benzoic acid are Mg, CO₂ and water.

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Combustion can be defined as the reaction of a compound with oxygen. The enthalpy of combustion of octane is \(\Delta H_{\rm rxn}\) for \(\rm C_8H_{18}\;+\;25\;O_2\;\rightarrow 8\;CO_2\;+\;9\;H_2O\).

The enthalpy of reaction is the amount of heat energy absorbed or lost by the molecules in the chemical reaction.

The enthalpy of combustion is the amount of heat energy released by the compound in the reaction with oxygen.

The reaction in which heat is liberated with the reaction of a compound with oxygen has an enthalpy of combustion, equivalent to the enthalpy of reaction.

The combustion of octane can be given as:

\(\rm C_8H_{18}\;+\;25\;O_2\;\rightarrow 8\;CO_2\;+\;9\;H_2O\)

Thus, the reaction has combustion energy equivalent to the enthalpy of the reaction is \(\rm C_8H_{18}\;+\;25\;O_2\;\rightarrow 8\;CO_2\;+\;9\;H_2O\). Thus, option B is correct.

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A major product of the acid-catalyzed hydration of an alkene is CH3-CH2-CH2-OH,(CH3)2-OH-C-CH2-CH3.

Unsaturated compounds with at least one double bond between carbon atoms make up the class of hydrocarbons known as alkenes, which only include carbon and hydrogen. Olefins is yet another word for alkenes. Because they include a double bond, alkenes are more reactive than alkanes. Any hydrocarbon with one or more double bonds is referred to as a "olefin" and is frequently referred to as a "lkene." One can distinguish between internal and terminal monoalkenes. Terminal alkenes, also referred to as -olefins, are more advantageous.

However, the International Union of Pure and Applied Chemistry (IUPAC) suggests using the name "alkene" only for acyclic hydrocarbons with a single double bond, alkadienyl, alkatriene, etc., or polyene for acyclic hydrocarbons with two or more double bonds, and cycloalkene, cycloalkadiene, etc.

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You can fill in the table for other elements and their respective isotopes by determining the appropriate number of protons, neutrons, and electrons based on the given isotope mass number and atomic number.

To accurately fill in the table with the correct number of subatomic particles for the elements given the isotope mass number, we need to consider the composition of atoms and their respective subatomic particles. Atoms are composed of protons, neutrons, and electrons.

The number of protons in an atom is equivalent to its atomic number, which uniquely identifies the element. The number of neutrons can be determined by subtracting the atomic number from the isotope mass number. Electrons in a neutral atom are equal to the number of protons.

Let's take an example using the isotope mass number:

Isotope: Carbon-14 (mass number = 14)

Element: Carbon (atomic number = 6)Based on the atomic number and isotope mass number, we can determine the number of subatomic particles as follows:

Protons: 6 (same as the atomic number)

Neutrons: 14 - 6 = 8

Electrons: 6 (same as the number of protons in a neutral atom)

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Radiocarbon dating is used to determine the age of an object.

Radiocarbon dating is a method used to estimate the age of organic materials based on the decay of radioactive carbon-14 isotopes. This technique is widely employed in archaeology, geology, and other scientific fields. When living organisms, such as plants or animals, are alive, they maintain a ratio of carbon-14 to stable carbon-12 isotopes.

However, once they die, the carbon-14 begins to decay at a known rate. By measuring the remaining carbon-14 and comparing it to the initial ratio, scientists can calculate the time that has passed since the organism's death. This method is particularly useful for dating objects that are up to around 50,000 years old. Palynology is the study of pollen grains, taphonomy focuses on the process of decay and fossilization, and paleontology deals with the study of fossils but not specifically dating methods.

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Phosphate is any salt or ester of phosphoric acid with the chemical formula PO₄³-

According to this question, a chemical compound with the formula; FePO₄ was given. The iron ion has a 3+ charge and the phosphate ion has a 3- charge.

Charge of an ion can be estimated by finding the difference between the number of protons and electrons in the atom.

Phosphate is an ion with charge of -3, hence, it complements an iron ion with charge +3 to form a neutral compound.

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Answer:

Explanation:

b. 3 sig figs

c. 3 sig figs

d. 2 sig fig

e. 4 sig fig

f. 4 sig fig

g. 4 sig fig

h. 2 sig fig

i. 5sig fig

water is a pure substance

Sodium can be used to solve the problem of

Sodium polyacrylate is a sodium salt of polyacrylic acid. It is a super absorbent polymer (SAP) that has great adsorption abilities enabled by the presence of sodium. These abilities find great application in many consumer products as it solves a lot of problems.

Metal ions can be removed from water in industries and water bodies using sodium polyacrylate because it has the ability to increase the surface area of porous substances so that there can be more transfer of mass.

Summarily, the problem of metal ions in water which causes pollution can be solved using GUK.

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Answer:

D

Explanation:

the ratio of H2 to N2 is 6:1

therefore it means that for 1 mol we have 7,8 so you multiply by 6

Answer:

Pressure = 83,000 Pascals

Explanation:

Force exerted by Earth's atmosphere = 124,500 N

Area of kitchen table on which force is exerted = 1.5 m²

Formula:

\( \boxed{ \rm Pressure= \dfrac{Force}{Are}}\)

By substituting values in the formula we get:

\( \rm \implies Pressure= \dfrac{124500}{1.5} \\ \\ \rm \implies Pressure=83000 \: Pa\)