The formula K₂S indicates that _______.

mixture is the answer

The answer is C.CCl2F2.

Answer:

The difference between an ionic and covalent bond is that an ionic bond is that an ionic bond is between a nonmetal and a nonmetal and a covalent bond between a metal and a nonmetal.

IONIC BOND:

NM-NM

COVALENT BOND:

[M+][NM-]

Answer:  Spiral

Explanation:

A galaxy contains billions of stars, dust and gases which are bound together by gravity. Galaxies have mainly three shapes:

Spiral - It has nucleus at the center from which arms extend outwards and wrap around like a spiral. Milky way is a spiral galaxy.

Elliptical - It is like flat ellipse. It has now characteristic features.

Irregular - It does not have any definite shape.

The most common shape of galaxy is the spiral shape.

The correct option is A.

Diatomic molecules are molecules that are made up of only two atoms, the atoms can be of the same element or different elements. When the atoms are of the same element, the diatomic molecule is described as homonuclear; when the atoms are of different elements, the molecule is described as heteronuclear. The type of chemical bond that exist in diatomic molecule is covalent bond.

Structural isomer of ethylcyclohexane which also contains 6-carbon ring is as shown in the attachment.

Structural isomers are defined as the isomers  in which  atoms are completely  arranged  in a different order but the molecular formula remains the same.

They are the molecules which have same molecular formula but different  connectivities  of atoms  which depend on the order they are put together.An increase in the number of carbon atoms leads to an increase  in the structural isomers.

There are 3 types of structural isomerism  which are as follows:

1)Chain isomerism - In this isomerism, there is a difference  in the atomic arrangement  of carbon and carbon chain .

2) position isomerism- In this isomerism, there is a difference  occupied by the substituent atoms  due to unsaturation in the chain.

3) functional group isomerism-In this isomerism, there is a presence of odd form of a functional group.

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Answer:

the answer is D, i just got a 100

Explanation:

im him

The formation of a gas in a chemical reaction due to ions exchanging partners typically indicates that the reaction is a double-displacement or double-displacement reaction.

The formation of a gas in a chemical reaction, due to ions changing places, often indicates that the reaction is a double-displacement reaction. A double-displacement reaction involves two ionic compounds in aqueous solution where the anions and cations exchange partners, resulting in the formation of two new compounds. This type of reaction typically occurs in aqueous solutions and one of the new compounds formed is often a solid precipitate, a gas, or a molecular compound such as water.

Examples of double-replacement reactions include reactions where an acid reacts with a base to form a salt and water (neutralization), or when two soluble salts react and produce an insoluble salt precipitate or a gas. Overall, the distinguishing characteristic of a double-displacement reaction is that both reactants are compounds and they swap their anion or cation partners.

In a chemical reaction, if the temperature changes, it means that energy was transferred.

In a chemical reaction, if the temperature changes, it means that energy was transferred. This is because chemical reactions involve the breaking and formation of chemical bonds, which requires energy.

For example, when a chemical reaction releases energy, the surroundings absorb that energy and the temperature of the surroundings increases. On the other hand, if a chemical reaction absorbs energy, the surroundings lose energy and the temperature of the surroundings decreases.

Therefore, the correct answer is B. Energy was transferred.

Answer:

plato answer d

Explanation:

1.6 moles of phosphorus (P) will form approximately 113.6 grams of tetraphosphorus decoxide (P4O10) when reacting with oxygen.

Phosphorus (P) has a molar mass of 31 g/mol, and the compound formed, tetraphosphorus decoxide (P4O10), has a molar mass of 284 g/mol.

You have 1.6 moles of phosphorus. In the balanced chemical equation, P8 + 5O2 --> 2P4O10, we can see that 1 mole of P8 produces 2 moles of P4O10. Since one P8 consists of 8 P atoms, this means that 8 moles of P forms 2 moles of P4O10. A simple cross-multiplication gives us that 1.6 moles of P form 0.4 moles of P4O10.

To translate this to grams, we know that one mole of P4O10 is 284 grams. Multiplying 0.4 moles with the molar mass of P4O10, we get that 1.6 moles of P form approximately 113.6 grams of P4O10.

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Answer:

Granite

Explanation:

Fossil is a well preserved remains  or traces of plant and animals. Fossil are found in various kind of rock. Usually in rocks that can create the necessary environment to conserve life. Rocks that has vital nutrient and conducive environment to nurture life contain fossils.  

Granite is the only rocks least likely among the option that can harbor life and invariably contain fossil due to the mode of formation. Granite is an intrusive igneous rocks . Granite is formed from a molten liquid called magma .This magma solidify below the earth surface to form granite. The temperature were this rock form is usually high and it rarely support life. Plant and animal cannot strife in the kind of environment that  produce granite because of the temperature therefore if this creature cannot live their, the remains can hardly be found.

Generally, granite cannot preserve fossils.

Explanation:

Density is defined as the mass of the substance divided by the volume of the substance.

Mathematically,      Density = [tex]\frac{mass}{volume}[/tex]

Since, it is given that mass is 18,754 kg and density is 0.788 g/[tex]cm^{3}[/tex]. We know that there are 1000 grams in 1 kg.

So, 18,754 kg equals 18,754000 grams.

Hence, calculate the volume of the waste collection tank as follows.

                   Density = [tex]\frac{mass}{volume}[/tex]

        0.788 g/[tex]cm^{3}[/tex] = [tex]\frac{18754000 g}{volume}[/tex]  

                    volume = 23799492.38 [tex]cm^{3}[/tex]

It is known that 1 [tex]cm^{3}[/tex] equals 0.001 liter. So, 23799492.38 [tex]cm^{3}[/tex] equals 23799.49 liters.

Thus, we can conclude that volume of the waste collection tank is 23799.49 liters.

Answer : The  volume of the waste collection tank is 23799.5 L

Explanation :

Density : It is defined as the mass contained per unit volume.

Formula used for density :

[tex]Density=\frac{Mass}{Volume}[/tex]

Given :

Mass of methanol = 18754 kg =  18754000 g     (1 kg = 1000 g)

Density of methanol = [tex]0.788g/cm^3[/tex]

Now put all the given values in the above formula, we get:

[tex]0.788g/cm^3=\frac{18754000g}{Volume}[/tex]

[tex]Volume=23799492.38cm^3=23799492.38mL=23799.5L[/tex]

Conversion used : [tex](1cm^3=1mL=0.001L)[/tex]

Therefore, the volume of the waste collection tank is 23799.5 L

Answer : The correct option is Acid.

Explanation :

Therefore, the acid is a substance which accepts an electron-pair.

Answer:

The correct answer is option C, that is, congo red that changes from red to violet around a pH of 5.0.

Explanation:

Congo red refers to the sodium salt of benzidinediazo-bis-1-naphthylamine-4 sulfonic acid. It is a diazo dye, which is blue in acid solution and red in alkaline solution and is used mainly as a biological stain and as an indicator. Congo red is an indicator, which is red at pH 5.0, and blue-violet at pH 3.0. In microscopy and histology, Congo red has an application for staining in amyloidosis, for the outer membrane of Gram-negative bacteria, and for the cell walls of plants and fungi.

The activation energy is usually symbolized by 'E' or 'Ea' in many diagrams. When analyzing biochemical reactions with and without an enzyme, the activation energy with an enzyme may be represented by 'b', while without an enzyme might be represented by 'a'.

In most diagrams that represent energy in a chemical reaction, the activation energy is typically represented by the letter 'E' or 'Ea'. The activation energy is the energy necessary for a chemical reaction to occur. In the context of a biochemical reaction influenced by an enzyme, the activation energy would be represented separately for the reaction with and without the enzyme.

For example, in a reaction without an enzyme, it might be represented by the letter 'a', which indicates a large amount of activation energy required. But in a reaction with an enzyme, it might be represented by the letter 'b', signifying the lower amount of activation energy required due to enzyme catalysis. Hence, enzymes lower the activation energy making the reactions occur more readily.

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Answer:

2 (two) atoms of iron

Explanation:

There are 2 iron atoms in the representation 2Fe. If the it indicates 2 moles of Fe, then it contains 1.2 × 10²⁴ atoms.

Iron is 26th element in periodic table. It is classified into the d-block and is called a transition metal. The chemical symbol of iron is Fe. Fe is a good conductor both thermally and electrically and it is widely used in daily life and in industries.

The number of atoms in one mole of an element is 6.02 × 10²³ . This number is called Avogadri number. Hence one mole of every element contains Avogadro number of its atoms.

Thus, if 2 Fe represents 2 moles of Fe, then its number of atoms is :

2 ×6.02 × 10²³ =  1.2 × 10²⁴ atoms

If it just represent 2 atoms of Fe, then are just 2 Fe atoms.

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Final answer:

The differences in the heights of the mercury and water columns in barometers are attributed to their different densities and the way atmospheric pressure influences them, with mercury's much higher density allowing for a shorter and more practical barometer design. Atmospheric pressure at sea level supports a mercury column of approximately 760 mm high.

Explanation:

The difference in the heights of the mercury and water columns in barometers is primarily due to their different densities. Mercury is much denser than water, about 13.6 times more so. This significant difference in density means that a mercury barometer can be much shorter than a water barometer to measure the same atmospheric pressure. Atmospheric pressure at sea level supports a mercury column of approximately 760 mm high, which is a standard measurement. However, for water, because it is less dense, the corresponding column needs to be over 10 meters high.

The heights of these columns also vary with altitude. For instance, at higher altitudes like Denver, Colorado, or the summit of Mt. Everest, the mercury column does not rise as high due to the decrease in atmospheric pressure. Hydrostatic pressure, the pressure exerted by a fluid due to gravity, plays a crucial role in how these barometers work. Hence, using mercury allows for a more practical and manageable barometer design.

The difference in the heights of mercury and water columns in a barometer is primarily due to variations in density between the two liquids. A barometer measures atmospheric pressure by balancing the weight of a column of liquid against the atmospheric pressure pushing down on the liquid's surface.

Mercury, a dense liquid metal, is commonly used in barometers due to its high density. The greater density of mercury compared to water means that a shorter column of mercury can exert the same pressure as a taller column of water.

The relationship between pressure, density, and height in a fluid column is described by the hydrostatic pressure equation: [tex]\(P = \rho \cdot g \cdot h\), where \(P\)[/tex] is pressure, [tex]\(\rho\)[/tex] is density, (g) is the acceleration due to gravity, and (h) is the height of the fluid column.

Because mercury has a higher density than water, a smaller height (h) of mercury is needed to balance the atmospheric pressure. In contrast, water requires a taller column to generate the same pressure due to its lower density.

In summary, the difference in height between the mercury and water columns in a barometer is a result of the varying densities of the two liquids, where the denser mercury requires a shorter column to balance atmospheric pressure compared to the less dense water.

The question probable may be:

What is the primary reason for the difference in height between mercury and water columns in a barometer, and how does the hydrostatic pressure equation explain this phenomenon?

Answer: A)  polar molecule  

Explanation: Polar molecules are molecules which contain atoms of different electronegativities.

Non polar molecules are molecules which contains atoms of same electronegativities.

Water is a polar covalent molecule formed by unequal sharing of electrons. Oxygen being more electronegative tend to keep the electron pair towards itself thus generating a partial negative charge. The hydrogen acquire a partial positive charge thus resulting in a polar molecule.

The bent shape is due to repulsion between lone pairs and bond pairs of electrons.

Answer:

it would be 82.75

Explanation:

Final answer:

To predict the performance and environmental impact of a firework, its theoretical yields of oxygen, carbon dioxide, and sulfur dioxide are calculated. Actual yields are compared to these theoretical yields to determine percent yield, while also considering limiting reactants and their effects on the reaction's end amount.

Explanation:

To calculate the theoretical yield of oxygen, carbon dioxide, and sulfur dioxide produced from the 280 g of black powder used in a firework, we must first write and balance the chemical reaction using the components of gunpowder: charcoal (carbon), sulfur, and saltpeter (potassium nitrate). Saltpeter acts as the oxidizing agent providing the oxygen needed for combustion. The actual amounts of products formed can then be compared with theoretical yields to find the percent yield:

Percent yield for each gas is calculated by dividing the actual yield by the theoretical yield and multiplying by 100. Pyrotechnicians must be concerned with the yield of reactants in fireworks because it affects the quality and safety of the firework and the amount of pollution created, which impacts the environment.

Limiting reactants are substances that will be consumed first, restricting the amount of product formed. By identifying which compounds are limiting, a pyrotechnician can predict how much product will be generated.

Answer: 3.19x10*8

Explanation: