An 80.0-gram sample of water at 10.00C absorbs 1680 Joules of heat energy. What is the final temperature of the water

4-methyl-2-pentene s the expected major organic product from treatment of 4-methyl-2-pentyne with sodium metal in liquid ammonia.

The process includes hydrogenation of an alkyne to an alkene in liquid ammonia using sodium metal. This is a particular reaction that leads in the creation of trans alkene.  Alkynes are hydrocarbons with triple carbon-carbon bonds. For molecules with a single triple bond, their typical formula is CnH2n-2 (and no rings).

A number of the same reactions occur in alkynes as in alkenes, but they can react twice due to the existence of two p-bonds inside the triple bond. When sodium dissolves into liquid ammonia (boiling point -33 °C), it turns a vivid blue. When there are alkynes present, they have reduced to a trans (i.e. E) alkene.

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The empirical formula of the compound is BF3.

The empirical formula of a compound is the simplest whole-number ratio of atoms that represents the compound's composition. To determine the empirical formula of a compound, we need to determine the number of moles of each element present and then simplify the ratio of moles to the smallest whole-number ratio.

First, we can use the percentages of boron and fluorine to find the number of grams of each element present in 100 grams of the compound:

15.94 g boron / 100 g compound

84.06 g fluorine / 100 g compound

Next, we can convert the number of grams of each element to moles using the molar masses of boron and fluorine:

15.94 g B / (10.81 g/mol) = 1.48 mol B

84.06 g F / (18.99 g/mol) = 4.44 mol F

To find the empirical formula, we divide the number of moles of each element by the lowest number of moles:

1.48 mol B / 1.48 mol B = 1.00

4.44 mol F / 1.48 mol B = 3.00

So the empirical formula of the compound is BF3.

It's important to note that this is the empirical formula, and the actual formula of the compound could be a multiple of this depending on the chemical structure of the compound.

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Heat engine is a system that converts thermal energy into a form of useful mechanical or electrical energy.

In thermodynamics, the heat engine is a system which is able to convert the heat or thermal energy into mechanical or electrical energy which can be used in order to perform mechanical work. This is achieved by bringing the a particular working substance to a lower state temperature from a higher state temperature.

There are a different types of heat engines in which the Carnot engine possesses the maximum efficiency. Some examples of heat engines are firearms, thermal power station etc.

Hence, the correct option is b. heat engine.

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Carbohydrates, is 60% of what your food made up of and it is composed of carbon, hydrogen and oxygen.

Carbohydrates are known to be the group of organic compounds that are an important source of energy for the body. They are composed of carbon, hydrogen and oxygen and are classified as simple or complex depending on their chemical structure. Monosaccharides, also called monosaccharides, include glucose, fructose, and galactose, and are found in foods such as fruit, table sugar, and honey. Complex carbohydrates, also called polysaccharides, contain starches and fibers and are found in foods such as grains, legumes, and vegetables. Carbohydrates play an important role in providing energy for the body, maintaining proper brain and nervous system function, and supporting tissue growth and repair.

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Answer:

8.3 × 10⁴kg

Explanation:

Solution in the diagram

The ma le repr0 ductive system includes made up of internal organs such as the prostate gland, vas deferens, as well as ure thra as well as external geni talia like the pe nis, tes tes, as well as scrot um.

The health of something like the male reproductive system and the hormo nes secreted by the brain determine a man's fertility as well as sexual characteristics.

The human reproductive system would be the organ system primarily charged of creating and fertilizing gametes (eggs but rather sperm) as well as carrying a fetus. The gonads of both se xes create gametes.

The ov aries, fallopian tubes, uterus, cervix, as well as vagina are all parts of the female repro ductive system. It comprises the pe nis, prostate, as well as tes tes in men.

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1.trans-[Pt(en)2Cl2]2+  

2.coordination compound Na [Al (OH)] systematic name: sodium tetrahydroxidoaluminate (III)

For several industrial and technical applications, sodium aluminate serves as an efficient supply of aluminum hydroxide. A white crystalline solid with the chemical formula NaAlO2, NaAl(OH)4 (hydrated), [2] Na2OAl2O3, or Na2Al2O4, pure sodium aluminate (anhydrous) is a white substance. Both a solution and a solid form of sodium aluminate are sold commercially.Other comparable compounds, often referred to as sodium aluminate, include Na5AlO4 and Na7Al3O8, which contain complex polymeric anions and Na17Al5O16 and NaAl11O17, which was originally wrongly thought to be -alumina, a phase of aluminum oxide.Aluminum chloride, sodium chloride, and water are produced when hydrogen chloride and sodium tetrahydroxoaluminate interact. Diluted hydrogen chloride in a solution form.

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We measure distance by using a ruler to measure the distance between the two places.

Distance is defined as the amount of the space between the two place or the things.

Short distances can be measured in centimeters (cm), and the long distances may be measured in kilometers (km). SI unit of the distance is meter (m). Distance is the length of the route between the two points. For example: Distance of a race; it is the length of the track between the starting line and the finishing line.

Maps can also be used to measure the distance. The name of the scale is map's bar scale.  

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The organocopper and inorganic ion by-products are not shown in this structural formula.

CH3CH=CH2Li

1. The reaction starts with CH3CH2CH2Br, which is a bromoalkane.

2. The bromine atom is replaced by a lithium atom with the help of two equivalents of copper.

3. The resulting product is CH3CH=CH2Li, which is an alkenyllithium compound.

CH3CH=CH2Li

The reaction starts with CH3CH2CH2Br, a bromoalkane. The bromine atom is replaced by a lithium atom with the help of two equivalents of copper. This is done via a nucleophilic substitution reaction, where the copper serves as a Lewis acid to facilitate the reaction. The resulting product is CH3CH=CH2Li, an alkenyllithium compound. This is the major organic product of the reaction and it has an E/Z stereochemistry. The organocopper and inorganic ion by-products are not shown in this structural formula.

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In a typical IR spectrum, wavenumber name describes the units shown on the x-axis.

According to common understanding, IR includes wavelengths between the notional red edge of the visible spectrum, which is at a frequency of 430 THz, and 1 millimeter (300 GHz) (although the longer IR wavelengths are often designated rather as terahertz radiation ).The spatial frequency of a wave is measured in cycles per unit distance (common wavenumber) or radians per unit distance, and is also known as the wavenumber or repetency[1] (angular wavenumber).It is comparable to temporal frequency, which is determined by the quantity of radians or wave cycles per unit of time (ordinary frequency) (angular frequency).

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Cool in cold or lukewarm water for 20 minutes.

This should be done as soon as possible after an injury. Never use ice, ice water, cream, or greasy substances like butter on the burn. Be careful to keep the airways open when treating burn victims. Associated smoke inhalation injuries are very common, especially when the patient is burned in an enclosed space such as a room or building. Even people who have been burned outdoors can inhale smoke. Stop the burning process as soon as possible. Remove all clothing and jewelry near the burned area.

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The required moles of oxygen is 10.0 mol of [tex]O_2[/tex] (Oxygen) is required to roast 10.0 mol of CuS (copper(I) sulfide).

Because the Sulphur absorbs the impurities as fumes and reacts with the remaining ore to produce Copper metal by auto-reduction, the ore is partially roasted.

[tex]Cu_2S.Fe_2S_3+O_2→Cu_2S+2FeS+SO_2[/tex]

[tex]Cu_2S+3O_2→Cu_2O+2SO_2[/tex]

Sulfide ore is heated by a heat source in the presence of air during the roasting process. The ore or ore concentrate is treated with very well-liked air during roasting. This method is frequently used when processing sulfide ores. The sulfide that is present during roasting is changed into oxide and emitted as sulfur dioxide, a gas.

Roasting's primary purposes are to eliminate volatile impurities and oxidize the ore by turning it into oxide.

A significant copper resource is COPPER-PYRITES, often known as chalcopyrite, which is a copper iron sulfide (CuFeS2).

To roast 10.0 mol of copper(I) sulfide (CuS), the balanced equation is CuS + O2 → CuO + SO2.

For every mole of CuS that reacts, one mole of O2 is consumed. Therefore, 10.0 mol of [tex]O_2[/tex] is required to roast 10.0 mol of CuS.

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Fluorine reacts with xenon but iodine doesn't because fluorine is highly electronegative, it can pull electrons from xenon which is a noble gas and rarely reactive. On the other hand, iodine has low electronegativity and is least reactivity, so doesn't react with xenon.

Fluorine and iodine belongs to the family of halogens with the general electronic configuration ns²np⁵ . So, they have the tendency to attract electrons in their valence shell. Xenon, on the other hand is a noble gas with a stable electronic configuration ns²np⁶.

In family of halogens, Fluorine has the highest electronegativity and iodine has the least due to increase in its size. So, more electronegative fluorine has the tendency to form compounds with xenon whereas both iodine and xenon being less reactive cannot form a bond together.

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Chemical Indicator refers to a substance that changes color when there is a certain concentration of hydrogen ions in a solution.

Chemical indicators are any substances that provide a clear indication—typically a change in color—of the presence or absence of a certain chemical species, like an acid or an alkali, in a solution. One such chemical is methyl yellow, which gives an alkaline solution a yellow color. When introduced to acidic or alkaline solutions, substances are considered indicators when their color changes. There are several indicators that are frequently used in laboratories, including litmus, phenolphthalein, and methyl orange. Litmus paper: It turns red in acidic solutions and blue in basic ones. Methyl orange: This chemical exhibits a red color in an acidic solution and a yellow color in a basic solution.

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The structure of maleic acid is H2C=CH2 with a double bond between two hydrogen atoms and a double bond between the second and third carbon atoms in the three carbon chain.

H3C-C=C-COOH

\ /

H2C=CH2

1. Draw a three carbon chain with a double bond between the second and third carbon atoms

H3C-C=C-COOH

2. Add two hydrogen atoms to the second carbon atom

H3C-C=CH2-COOH

3. Draw a double bond between the two hydrogen atoms

H2C=CH2-COOH

H2C=CH2

      \  /

H3C-C=C-COOH

The structure of maleic acid is H2C=CH2 with a double bond between two hydrogen atoms and a double bond between the second and third carbon atoms in the three carbon chain.

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The total reduction potential of a cell in which sodium (Na) is reduced and zinc (Zn) is oxidized -1.95 V.

The tendency of a chemical species is to be reduced, expressed in volts under normal conditions, is known as the standard reduction potential.

The standard reduction potential belongs to the group of potentials known as standard electrodes or standard cells. The difference in voltage between the cathode and anode is known as the standard cell potential. The standard sodium reduction potential is -2.71V. Zinc has an average reduction potential of -0.76 V. Therefore, the overall reduction potential is 1.95 V.

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The appropriate explanation for the non-metal is that the higher effective nuclear charge less will be the atomic radius.

Atomic radius typically decreases during a period from left to right. There are a few little outliers, such how the oxygen radius is a tiny bit bigger than the nitrogen radius. Protons are gradually added to the nucleus at the same time that electrons are gradually added to the main energy level. The enhanced positive charge of the nucleus gradually attracts these electrons closer to it. The size of the atoms shrinks as the strength of attraction between nuclei and electrons grows. Due to electron-electron repulsions that would otherwise result in the atom's size expanding, the effect becomes less pronounced as one proceeds further to the right in a period.

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54.0g Al reacts with 64.0g O2 to form Al2O3 according to the equation. 136 grams of Al2O3 form from 64.0 g O2.

The term molar mass is defined as the the ratio between the mass and the amount of substance of any sample of that compound. The molar mass is denoted by the symbol "M".

M = m / n

Molar Mass of O₂ is 32 g/mol

Molar Mass is Al₂O₃ is 102 g/mol

4 Al + 3 O₂ ⇒ 2 Al₂O₃

64.0 g O₂           1 mole           2 moles Al₂O₃            102 g

-----------------  x  --------------  x  ------------------------  x   -------------  

                            32 g               3 moles O₂             1 mole

=  136 g Al₂O₃

Thus,54.0g Al reacts with 64.0g O2 to form Al2O3 according to the equation. 136 grams of Al2O3 form from 64.0 g O2.

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Chemical: Wear the proper personal protective equipment (PPE) such as gloves, goggles, and an apron or lab coat.

Chemistry is the scientific study of the composition, structure, properties, and reactions of matter, especially at the atomic and molecular levels.

Use the chemical in a well-ventilated area.

Follow safety instructions and product labeling instructions precisely.
Avoid breathing vapors or mists of the chemical.
Immediately wash hands and exposed skin thoroughly with soap and water after contact with the chemical.
Store the chemical in a secure location away from food, drink, and other materials.
Dispose of the chemical properly.

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The concentration of hydroxide ions in the solution is 0.0428 M.

A molecule or atom that has a net electrical charge is called an ion.

The balanced equation for the reaction between HCl and Ca(OH)2 is:

Ca(OH)2 + 2HCl -> CaCl2 + 2H2O

The number of moles of HCl added at the equivalence point can be found by multiplying the volume of HCl added (in liters) by its concentration in moles/liter:

moles HCl = (38.1 mL HCl x 0.028 mol/L HCl) / 1000 mL/L = 0.00107 mol HCl

The concentration of hydroxide ions can be found by dividing the number of moles of hydroxide ions by the volume of the solution:

[OH-] = moles OH- / L of solution

We know that the number of moles of HCl added is equal to the number of moles of OH- present, so:

[OH-] = 0.00107 mol OH- / (25.0 mL / 1000 mL/L) = 0.0428 M

Therefore, the concentration of hydroxide ions in the solution is 0.0428 M.

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One gram of a chemical is equivalent to one mole.

A physical characteristic called the molar mass is calculated by dividing the mass of a given substance by the substance's volume. The standard relative atomic mass of an element is multiplied by the molar mass constant, 1 × 10⁻³ kg/mol = 1 g/mol, to determine the molar mass of its atoms. A compound's molar mass is calculated by adding the standard atomic weights of the constituent atoms and multiplying the result by the molar mass constant.

One atom or molecule has the same mass in grams as one mole of a substance does in atomic mass units.

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Two covalent bonds are formed by oxygen to complete their octet.

An electron exchange that results in the formation of electron pairs between atoms is known as a covalent bond. Bonding pairs or sharing pairs are the names given to these electron pairs. Covalent bonding is the stable equilibrium of the attractive and repulsive forces between atoms when they share electrons.

In chemistry, an octet is an arrangement of eight electrons in the outer electron shell of a noble gas atom. The relative inertness of noble gases and the chemical behaviour of several other elements are attributed to this structure.

The chemical element oxygen has an atomic number of 8. (it has eight protons in its nucleus). At normal temperatures and pressures, oxygen transforms into the chemical compound (O2) of two atoms, which is a colourless gas.

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To solve this we must be knowing each and every concept related to ecosystem. Therefore, the maximum number of species that a system can safely support determines the carrying capacity in an ecosystem.

An ecosystem is the fundamental fundamental unit of such an environment where living and nonliving creatures interact with one another, both of which are essential for the continuation of life on Earth.

The maximum number of species that a system can safely support is known as carrying capacity. The ability of an ecosystem to replenish the food, water, environment, or other essentials that populations have to thrive are just a few examples of the numerous variables that may affect an ecosystem's carrying capacity of a specific species.

Therefore, the maximum number of species that a system can safely support determines the carrying capacity in an ecosystem.

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Many of these, including cheese, gelatin, and various inks, are commonplace. Like the other classes, mixtures of solids and liquids may be separated in many ways.

science has been actively involved in the pursuit of this goal since it is crucial for a variety of liquids. When two or more distinct substances physically join, a mixture is produced that can be dispersed back into its constituent parts. a bowl of various candies, a pile of various leaves, steel, and sugar syrup A gelatin is any two or more different types of particles together. These particles are physically bound together rather than reacting chemically with one another. Two or more reactants are changed into one or more separate products during a chemical reaction. Alternately, we might assume that a chemical reaction rearranges the atoms of the reactants to create new products.

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Answer:

4. Double replacement

Explanation:

The generic equation shows that two compounds are being swapped, which is an indication of a double substitution reaction.

Correct answer double replacement.

So the correct answer is D) Double replacement.

When using a graduated cylinder you must look at Meniscus of the liquid when taking readings.

The surface at the center of the meniscus, not the top of the ring of liquid clinging to the graduated cylinder's wall, must be read in order to read a graduated cylinder correctly. This "center" will be the meniscus's lowest point for the majority of liquids. The center of the meniscus will be the highest point of the liquid for a very small number of liquids, such as mercury. Your line of sight must be level with the meniscus's center of curvature in order to interpret it correctly.

Reading a graded cylinder is a matter of paying close attention to the details once the measurement interval has been established and the meniscus has been assessed. Read the numbered line below while keeping your eyes level with the meniscus's middle and looking straight down.

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0.384 moles of nitrogen atoms are inhales by the person in an average breath of air.

Avogadro constant is the number of molecules present in 1 mole of gas or a chemical compound. It is used to specify the atomic mass of a certain number of molecules in a substance or chemical compound or gas, in grams. Theses molecules may be atoms, neutron, proton, electron, etc. One mole of a substance contains 6.023 × 10²³ Molecules. In other words the atomic mass of a substance is the weight of 6.023 × 10²³ molecules.

So 2.31 × 10²³ atoms of nitrogen = (2.31 × 10²³)/(6.023 × 10²³)

= 0.384 moles

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Answer: Both are only physical changes

Both converse mass

Explanation: the first two ones r correct