when acidified k2cr2o7 solution is added to na2s solution, green cr3 ions and free s are formed. when acidified k2cr2o7 solution is added to nacl, no change occurs. of the substances involved in these reactions, which is the best reducing agent?

Answer:

D or 4

Explanation:

right on edge 2021

Answer:

d

Explanation:

Answer:

I think it's because he was presumed dead after a storm, or like a problem with his suit

Explanation: I think it was because somebody thought he was dead in the storm? And the remaining of the crew were forced to leave him behind thinking he was dead on mars.

I might be right, might not ^^

Answer:

9.9966788 x 10^-1

A greenhouse gas that is exclusively anthropogenic is carbon dioxide (CO₂).

Global warming is responsible for the rise in the temperature of the earth due to several factors. This phenomenon of drastic rise in temperature of the earth due to some harmful gases viz. methane, carbon monoxide, Chlorofluoro carbons etc is called green house effect.

The gas that is exclusively anthropogenic in green house effect is carbon dioxide (CO₂) . Some other anthropogenic gases are Chlorofluoro carbons(CFC's), nitrous oxide (N₂O)  and hydrofluorocarbons (HFCs). The rise in the amount of CO₂ and CFC's is mainly caused by human activities on earth.

Carbon dioxide (CO₂) is also found to be naturally emitted from volcanic activity and respiration by living organisms, but its concentration is immensely increased in the atmosphere by burning of fossil fuels.

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The concentration of the zinc acetate, Zn(C₂H₃O₂) solution is 1.067 M

Mass of Zn(C₂H₃O₂)₂ = 20.5 g

Molar mass of Zn(C₂H₃O₂)₂ = 65 + 2[(12×2) + (3×1) + (16×2)]

= 65 + 2[59]

= 183 g/mol

Mole = mass / molar mass

Mole of Zn(C₂H₃O₂)₂ = 20.5 / 183

Mole of Zn(C₂H₃O₂)₂ = 0.112 mole

Volume = 105 mL = 105 / 1000 = 0.105 L

Concentration = mole / Volume

Concentration of Zn(C₂H₃O₂)₂ = 0.112 / 0.105

Therefore, the concentration of the zinc acetate, Zn(C₂H₃O₂) solution is 1.067 M

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Answer:

it is because they are placed geographically different.

The partial pressure of the hydrogen gas collected in this way is 710 mmHg. When collecting a gas over water, the total pressure of the system includes the vapor pressure of water at that temperature

When collecting a gas over water, the total pressure of the system is the sum of the partial pressure of the gas and the vapor pressure of water at that temperature. In this case, the total pressure is given as 742 mmHg, and the vapor pressure of water at 30°C is 31.8 mmHg.

To find the partial pressure of the hydrogen gas, we need to subtract the vapor pressure of water from the total pressure. Therefore, the partial pressure of the hydrogen gas can be calculated as:

Partial pressure of hydrogen gas = Total pressure - Vapor pressure of water

Partial pressure of hydrogen gas = 742 mmHg - 31.8 mmHg

Partial pressure of hydrogen gas = 710 mmHg

In this chemical reaction, the collected hydrogen gas exerts a partial pressure of 710 mmHg.

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12.308% of the chemical is sulfur. The compound's whole sulfur content is transformed into barium sulfate. Therefore, the mass for sulfur from barium sulfate will match the mass for sulfur in the compound.

People are not highly poisonous to sulfur. However, consuming far to much sulfur may result in diarrhea or a burning feeling. Sulfur dust inhalation might irritate the airway or make one cough. The eyes and skin may also become irritated by it.

Sulfur can indeed be found in sulfide ores and in nature. It is native to areas close to volcanoes and hot springs. The tenth most common element, sulfur, is found in almost all types of plant and animal life, meteorites, ocean ocean, the humankind's crust, and or the atmosphere.

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0.5 moles of ethanoic acid are required to produce 0.5 mol of the ester , Option B is the right answer.

The reaction in which a carboxylic acid combine with an alcohol to form ester and water is called esterification reaction.

It is given in the question that

Ethanoic acid reacts with ethanol to form an ester and water

C₂H₅OH  +  CH₃​COOH  →   CH₃COOH  +  H₂O

The moles of ethanoic acid required to produce 0.5 mole of ester.

In the following reaction it can be seen that the mole fraction of ethanoic acid to ester is 1: 1

Therefore 0.5 mole of ethanoic acid will be required to produce 0.5 mol of ester.

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Answer:

The farther to the left and down the periodic chart you go, the easier it is for electrons to be given or taken away, resulting in higher reactivity. Period - reactivity increases as you go from the left to the right across a period. Group - reactivity decreases as you go down the group.

Explanation:

Answer: 2 Just to clarify

Explanation:

The balanced chemical equations for the given reactions are:

16Ag + S₈  →  8Ag₂S

2 Al + 3 Br₂  →  2 AlBr₃

2 KClO₃  →  2KCl  + 3 O₂

CH₄  + O₂  →  CO₂   + 2 H₂O

2Al  + 3 O₂  → Al₂O₃

2 H₂O₂  → 2 H₂O   + 2 O₂

A balanced equation can be defined as an equation in which the number of atoms of every element involved in the reaction is equal on either side of the chemical equation.

The law of conservation of matter has to be obeyed by a balancing of a chemical equation.

By following the law of conservation of matter, the total mass of the elements of reactants will be equal to the total mass of products in a balanced chemical equation.

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The slope of the graph mass versus volume for the data is the density of the material.

The slope of a line in mathematics is given as;

m = y2 - y1/x2 - x1.

In this case we have a graph in which the y axis is the mass of the substance and the x axis is the volume of the substance. We know that ratio of the mass to the volume of the substance is the density and that this value is a constant.

As such, the slope of the graph mass versus volume for the data is the density of the material.

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Answer:

The answer is 2

Explanation:

when viewed from earth number 2 would be a waning gibbous

Diselenium hexabromide has the chemical formula Si2Br6.

The nomenclature of covalent compounds utilizing prefixes served as the basis for the name of disilicon hexabromide (di- represents two atoms and hexa- represents 6 atoms). Ionic compounds, on the other hand, use the IUPAC nomenclature system based on the cation's valency.

A compound's bonding will be covalent if it is created from two non-metals. In most cases, ionic compounds are created when a metal reacts with a nonmetal (or a polyatomic ion). The reaction between two nonmetals produces covalent compounds.

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The amount of sodium-24 decreases to approximately 125 g.

Sodium is a chemical element with the symbol Na on the periodic table. It is a soft, silvery-white, highly reactive metal and is a member of the alkali metal group of chemical elements.

The graph below shows the amount of 500 g sample of sodium-24 over time. The x-axis of the graph represents time (in hours), and the y-axis represents the amount of sodium-24 (in grams). The title of the graph is "Amount of sodium-24 in 500 g Sample Over Time".

The graph shows that the amount of sodium-24 in the sample decreases over time. After 24 hours, the amount of sodium-24 in the sample decreases to approximately 375 g. After 48 hours, the amount of sodium-24 decreases to approximately 250 g. After 72 hours, the amount of sodium-24 decreases to approximately 125 g.

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Answer:

this

Explanation:

Molar mass also called Atomic mass is the atomic weight. You can find this on the periodic table.

-

-

The answer would be

A. the mass in grams of one mole of a substance

Answer: Galena

Explanation:

(A). Galena

An unidentified mineral that is softer than calcite, exhibits a metallic luster and cubic cleavage. This mineral most likely is galena.

Talc, Gypsum, Calcite, Fluorite, Apatite, Feldspar, Quartz, Topaz, Corundum, and Diamond are just a few examples. - The "Mohs Scale of Mineral Hardness" lists common minerals in order of relative hardness, with talc being the softest and diamond being the hardest mineral. This scale should be familiar to rock hounds and earth science students alike.

When newly broken, galena is a metallic lead grey with a brilliant metallic shine; as it ages, it turns dark grey or black. It is incredibly hefty and fragile (about 7.6 times as heavy as water). Galena often crystallizes in cubic crystals and cleaves into flawless cubic pieces.

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Answer: False

Explanation: Gaining an electron which has a negative charge results in an overall negative charge, thus making this an anion, and the answer, false.

Answer:false

Explanation:it becomes a anion

Answer:

An equation is written in a correct way if the equation is balanced. If you want to find out if the equation is balanced, you have to count how many molecules of each element is present and then just balance the equation on the left side and the right side.

Answer:

Extensive properties, such as mass and volume depend on the amount of substance present and are not useful in the identification of a substance. In this experiment, we will use three properties to identify a liquid substance: solubility, density and boiling point

The properties would be helpful in determining the identity of the liquids are; Boiling point, density, Solubility, Specific Heat, and Chemical Tests. Properties That Might Not Be as Helpful are; color, odor, viscosity, surface tension, vapor pressure.

Here's a breakdown of properties that would be helpful and those that might not be as useful:

Helpful Properties:

Boiling Point: The boiling point of a liquid is the temperature at which it changes from a liquid to a gas. It is a characteristic property that can help identify a substance, as different substances have distinct boiling points.

Density: Density is the mass of a substance per unit volume. It can be a useful property for identification, especially if the density of a liquid is unique to a particular substance.

Solubility: Solubility refers to the ability of a substance to dissolve in a particular solvent. Testing the solubility of a liquid in different solvents or with other substances can help identify it.

Specific Heat: Specific heat is the amount of heat required to raise the temperature of a substance by a certain amount. It can provide clues about the identity of a liquid based on its heat-absorbing behavior.

Chemical Tests: Conducting chemical tests, such as pH tests or reactions with specific reagents, can reveal unique chemical properties that aid in identification.

Properties That Might Not Be as Helpful:

Color: While color can sometimes provide information, many substances can have similar colors. Therefore, color alone may not be definitive for identification.

Odor: Similar to color, odor can vary and may not be distinctive enough to determine the identity of a liquid.

Viscosity: Viscosity is a measure of a liquid's resistance to flow. While it can be a characteristic property, it might not be sufficient on its own for accurate identification.

Surface Tension: Surface tension measures the force that causes the surface of a liquid to contract. While interesting, it may not provide enough information for precise identification.

Vapor Pressure: Vapor pressure can change with temperature, and while it's a characteristic property, it might not be the most practical for identification purposes.

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Answer:

you're going to start by balancing the carbon first. To do this, you want to times the carbon on the right by 4 so we put a 4 in front of the CO2.C4H8 + O2 --> 4CO2 + H2OWe're now going to try and balance the hydrogen by putting a 4 in front of the H2O.C4H8 + O2 --> 4CO2 +4H2OThen we're going to count the oxygens on both side and balance them by putting a 6 in front of the O2.C4H8 + 6O2 --> 4CO2 + 4H2O

Answer:

hope this helps :) please correct me if I'm wrong.

C4H8 + 6O2 --> 4CO2 + 4H2O.

Explanation:

C4H8 + O2 --> CO2 + H2O

C=4 C=1

H=8 H=1

O=2 ---> O=3

C4H8 + 6O2 --> 4CO2 + 4H2O

C=4 C=4

H=8 H=8

O=12 ---> O=12

The boiling point of the solution  in which 22. 5 grams of sucrose (C12H22O11) is dissolved in 550 mL of water  is approximately 100.06 °C.

The boiling point of a solution that contains 22.5 grams of sucrose (C12H22O11) dissolved in 550 mL of water can be determined by calculating the molality of the solution and using it to find the boiling point elevation constant.

Molality is the concentration of a solution in moles of solute per kilogram of solvent.

The formula for molality is given as:

molality = moles of solute / mass of solvent (in kg)

First, we need to determine the number of moles of sucrose in the solution.

To do that, we need to convert the mass of sucrose to moles by dividing by its molar mass.

Molar mass of C12H22O11 = 12(12.01) + 22(1.01) + 11(16.00) = 342.3 g/mol

Number of moles of sucrose = mass of sucrose / molar mass of sucrose

= 22.5 g / 342.3 g/mol

= 0.0657 mol

Next, we need to convert the volume of water to its mass.

The density of water is 1 g/mL, so 550 mL of water has a mass of 550 g = 0.550 kg.

molality = moles of solute / mass of solvent

= 0.0657 mol / 0.550 kg

= 0.1195 mol/kg

The boiling point elevation constant, Kb, for water is 0.512 °C/m, which means that the boiling point of water is increased by 0.512 °C for every 1 molal increase in molality.

Therefore, the boiling point elevation of the solution, ΔTb, is given by:

ΔTb = Kb × molality

= 0.512 °C/m × 0.1195 mol/kg

= 0.0612 °C

The boiling point of the solution can then be calculated as follows:

Tb = boiling point of pure solvent + ΔTb

= 100 °C + 0.0612 °C

= 100.0612 °C

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Answer:

anjsbzhahxbVAbzbsbsbsbsjsjsdp

Glass-based ceramic crowns tend to have a more lifelike appearance than porcelain bonded to metal (PFM) crowns due to a few key factors such as allergic reactions, metal-free PFM, aesthetics, etc.

Translucency: Compared to the opaque metal core used in PFM crowns, glass-based ceramic materials, such as lithium disilicate or zirconia-reinforced lithium silicate, offer increased translucency.

Aesthetics: Glass-based ceramics may be more effectively matched in terms of color, tone, and texture to the neighboring natural teeth.

Metal-free: Unlike PFM crowns, glass-based ceramic crowns lack a metal underpinning.

Allergic reactions: PFM crowns include metal alloys, which some people may be sensitive to.

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Answer:

310.15 Degrees Kelvin

Explanation:

37 Degrees Celsius = 310.15 Degrees Kelvin = 98.6 Degrees Fahrenheit

Conversion Factor from Celsius to kelvin

or 37 + 273 = 310 Degrees Kelvin

Sweat glands in the skin produce a substance called sweat, also known as perspiration.

Sweat glands in the skin produce a substance called sweat, also known as perspiration. Sweat is a transparent, mostly odorless liquid that is composed of water, electrolytes, and small amounts of other compounds.

Sweat glands are classified into two types: eccrine and apocrine glands. Eccrine glands are the most numerous and are found throughout the body. They produce a watery sweat that helps regulate body temperature by evaporating from the skin's surface, cooling the body.

Apocrine glands are found primarily in the armpits and groin area. They produce a thicker, milky sweat that contains proteins and lipids. When bacteria on the skin metabolize this sweat, it can result in body odor.

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Answer:

The boiling point and freezing point of the given liquid comes out to be 100°C or 373 K and 0°C or 273 K respectively under one atmospheric pressure, it confirms that the given liquid is pure water.

Explanation:

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The boiling point and freezing point of the given liquid comes out to be 100°C or 373 K and 0°C or 273 K respectively under one atmospheric pressure, it confirms that the given liquid is pure water

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Answer:

To calculate the mass of the sample, we can use the formula:

mass = density x volume

Given that the density of pure silicon is 2.34 g/cm^3 and the volume is 450 mL, we can plug in these values:

mass = 2.34 g/cm^3 x 450 mL

Before we can multiply, we need to convert mL to cm^3 since the units need to match:

1 mL = 1 cm^3

So:

mass = 2.34 g/cm^3 x 450 cm^3

Now we can multiply:

mass = 1053 g

Therefore, the mass of the sample of pure silicon is 1.053 x 10^3 g, or 1.053 kg, with three significant figures.

Explanation: