If an object has a mass of 42 kg and a volume of 2m3 what is its density

1.The solution will gradually become colorless as the sulfur dioxide reacts with the potassium permanganate(Potassium manganate(VII))

The reaction

2MnO₄⁻ (aq) + 6H⁺ (aq) + 5SO₃²⁻ (aq) -> 2Mn²⁺ (aq) + 3H₂O (l) + 5SO₄²⁻ (aq)

2. Natural gas is a mixture of hydrocarbon gas with methane (CH₄) as the main composition in addition to other gases such as CO₂ and H₂

3. Halide ions are detected using silver nitrate (acidified using nitric acid) which forms deposits of different colors

Br-Bromide ions: cream

Cl-Chloride ions: white

I-Iodide ions: yellow

so the answer Potassium iodide

4. Compounds that are alkaline are useful for neutralizing acids including the desulfurization process to neutralize acidic gases (SO₃). The bases used are lime or caustic soda

Lime can be Calcium oxide (CaO - quicklime)

5. Ethanol (C₂H₅OH) can be made from C₂H₄ (ethene) with steam, apart from the Alcoholic fermentation of glucose

6. Compounds are formed from 2 or more types of elements which can be ionic compounds or covalent compounds

There are 0.025 grams of dextrose in 0.0005 kiloliters (or 0.5 liters) of D5W.

Let's recalculate the amount of dextrose in 0.0005 kiloliters of D5W accurately:

To calculate the amount of dextrose in D5W, we multiply the volume of D5W by the percentage strength of dextrose in D5W.

Given:

Volume of D5W = 0.0005 kiloliters

Percentage strength of dextrose in D5W = 5% = 0.05

First, let's convert the volume of D5W from kiloliters to liters:

0.0005 kiloliters = 0.0005 × 1000 = 0.5 liters

Now, we can calculate the amount of dextrose:

Amount of dextrose = Volume of D5W × Percentage strength of dextrose in D5W

Number of dextrose = 0.5 liters × 0.05

Amount of dextrose = 0.025 grams

Therefore, there are 0.025 grams of dextrose in 0.0005 kiloliters (or 0.5 liters) of D5W.

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When a sample of 89.56 g  NH4NO3 dissolves in 42.05 g of water, the temperature changes from 28.69 c to 7.8 c, the heat flow (q) in this case is approximately -11,165 Joules.

To calculate the heat flow (q) in this case, we can use the equation:

q = m × C × ΔT

where:

q is the heat flow

m is the mass of the solution (water + NH4NO3)

C is the specific heat capacity of the solution

ΔT is the change in temperature of the solution

First, we need to find the mass of the solution by adding the mass of the water and the mass of NH4NO3:

Mass of solution = Mass of water + Mass of NH4NO3

= 42.05 g + 89.56 g

= 131.61 g

Next, we calculate the change in temperature:

ΔT = Final temperature - Initial temperature

= 7.8°C - 28.69°C

= -20.89°C

Now, we need to determine the specific heat capacity of the solution. Since the specific heat capacity of water is commonly used, we can assume it is approximately 4.18 J/g·°C.

Plugging the values into the equation, we can calculate the heat flow (q):

q = 131.61 g × 4.18 J/g·°C × (-20.89°C)

≈ -11,165 J

Therefore, the heat flow (q) in this case is approximately -11,165 Joules.

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1) The wavelength of A is \(6.98 * 10^-8\) meters

2) The wavelength of B is \(3.45 * 10^-11\) meters

wavelength = speed of light / frequency

The speed of light is approximately \(3.00 * 10^8\) meters per second.

For light sample A with a frequency of \(4.30 * 10^15\)Hz:

wavelength of A = (\(3.00 * 10^8\) m/s) / (\(4.30 * 10^15\) Hz)

wavelength of A =\(6.98 * 10^-8\) meters

For light sample B with a frequency of\(8.70 * 10^18\) Hz:

wavelength of B = (\(3.00 * 10^8\)m/s) / (\(8.70 *10^18\)Hz)

wavelength of B = \(3.45 * 10^-11\) meters

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Answer:

I just love the killua pfp

I think b

Answer:

c

Explanation:

because it forces and help it

A redox reaction is a chemical reaction in which one or more of the reacting species undergoes oxidation and one or more undergoes reduction. An oxidizing agent is an element or compound that oxidizes another substance, while a reducing agent is an element or compound that reduces another substance.

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Thus, the empirical formula of this compound is S2O5 S 2 O 5 .

The simplest whole number ratio of atoms from each element in a compound is called the empirical formula. The precise amount of atoms of each element in a compound is given by its molecular formula. the connection between the molecular formula and empirical formula.

The simplest whole number ratio of atoms from each component of a compound is its empirical formula. It is determined empirically utilizing data from trials. For instance, whereas the empirical formula for glucose is CH 2O, its molecular formula is C 6H 12O 6.

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The oxidation reduction reaction are given below.

Oxidation half reaction:

Zn° →Zn² + 2e-

Reduction half reaction:

2Mn^5 +4e^- → 2Mn^2+

Belo w are the oxidation and reduction reaction of the common alkaline batteries to produce electricity.

Oxidation half reaction:

Zn° →Zn² + 2e-

Reduction half reaction:

2Mn^5 +4e^- → 2Mn^2+

To balance the overall reaction, we need to multiply each half reaction by appropriate coefficients to ensure that the electrons cancel out.

Here is the balance overall reaction.
2Zn° + 2Mn^5 → 2Zn² + 2Mn²+

The balanced equation shows that in alkaline batteries, zinc metal is oxidized to form zinc ion, while manganese ions are reduced to manganese(II) ions. The oxidation reduction reaction    generate an electric current as a result of the flow of electrons.

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Answer:

it is very important to know how elements and compounds react together because everything that surrounds us is made out of elements and compounds. Therefore, understanding how these work can allow us to have a better understanding of the world that surrounds us. Moreover, it can avoid accidents when we deal with dangerous compounds, such as when we cook or clean.

Explanation:

Explanation:

Physical change can observe by physical appearance

OA = No change in color

other choices are chemistry change

If 30 ml of a 0.80 m solution of k is mixed with 50 ml of a 0.45 m solution of clo−4, a precipitate will be observed in this solution.

The solution contains k (potassium) and clo−4 (chlorate) ions and we are to find out if a precipitate will form or not. The ksp for the following equilibrium is 0.004. kclo4(s)↽−−⇀k (aq) clo−4(aq)

We can obtain the molarity of k ions as follows: 0.80 M = (moles of K)/(0.030 L)Moles of K = 0.80 M × 0.030 L = 0.024 mol

We can obtain the molarity of clo−4 ions as follows: 0.45 M = (moles of clo−4)/(0.050 L)Moles of clo−4 = 0.45 M × 0.050 L = 0.0225 mol

The concentration of K and clo−4 ions are 0.8 M and 0.45 M respectively. Now, we need to calculate the reaction quotient Q of the solution to find out whether the precipitate will form or not. Q = [K+][clo−4] = 0.8 M × 0.45 M = 0.36

Since Q (0.36) > Ksp (0.004), the reaction quotient is greater than the solubility product constant. It indicates that the product is more than what it should be. The excess products will precipitate to form a solid. Hence, we can say that a precipitate will be observed in this solution.

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Answer:

The awnser is a single called organism

Explanation:

The above picture shows a a single-celled organism. Specifically, it is a protozoan with many cilia, which are the small white hair-like projections.

We can confirm that the velocity of an object is determined by the displacement of the object over a period of time.

We know this by analyzing the scientific formulas created to measure the velocity of an object. The formula for this is \(\frac{d}{t}\) , meaning displacement over a period of time. Since option 3 described this equation perfectly, we can say that this is the correct option.

Therefore, we can confirm that the velocity of an object is determined by the displacement of the object over a period of time.

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The average daily output of sulfur dioxide (SO2) is approximately 12,118.56 kg.

The average daily output of sulfur dioxide (SO2) assuming that 5% of the sulfur content of the coal ends up in the ash (i.e. 5% of S is unreacted) and the rest is released in the stack gas can be calculated as follows: Given, Quantity of coal burned each day at the Iowa State University Power Plant = 250,000 kg Average sulfur content of the coal = 2.55%5% of the sulfur content ends up in the ash, and the rest is released in the stack gas. Hence, the percentage of sulfur that goes into the stack gas is 100% - 5% = 95%. Therefore, the daily amount of sulfur burned in coal = 250,000 kg x 2.55% = 6,375 kg, Amount of sulfur that goes into the ash = 5% x 6,375 kg = 318.75 kg, Amount of sulfur that goes into the stack gas = 95% x 6,375 kg = 6,056.25 kgThe molecular mass of SO2 = 64 g/mol. Hence, the molar mass of S = 32 g/mol.

The daily amount of sulfur dioxide produced from sulfur burned in the coal is equal to the amount of sulfur burned in the coal multiplied by the molar mass of sulfur dioxide i.e., 6,056.25 kg / 32 g/mol = 189,265 mol. The number of moles of sulfur dioxide can be converted to mass by multiplying it with the molar mass of sulfur dioxide i.e., 189,265 mol x 64 g/mol = 12,118,560 g = 12,118.56 kgTherefore, the average daily output of sulfur dioxide (SO2) is approximately 12,118.56 kg. When coal is burned, it emits various gases such as sulfur dioxide, nitrogen oxides, and carbon dioxide. Sulfur dioxide (SO2) is a gas that causes acid rain, which is detrimental to human health, plants, and animals, as well as buildings and monuments.

The average daily output of sulfur dioxide (SO2) is calculated to be approximately 12,118.56 kg. It is due to the 250,000 kg of coal that is burned every day at the Iowa State University Power Plant, which is a mixture of Kentucky, Illinois, and Colorado coal, with an average sulfur content of 2.55%. In addition, it is assumed that 5% of the sulfur content of the coal ends up in the ash, and the rest is released into the stack gas. As a result, 95% of sulfur in coal, i.e. 6,056.25 kg, is released into the stack gas, and 5% of sulfur in coal, i.e. 318.75 kg, ends up in the ash. Therefore, the average daily output of sulfur dioxide (SO2) is approximately 12,118.56 kg.

The burning of coal leads to the emission of various gases, including sulfur dioxide (SO2), which has detrimental effects on the environment, human health, and animals. The average daily output of sulfur dioxide (SO2) is determined based on the quantity of coal burned every day at the Iowa State University Power Plant, which is a mixture of Kentucky, Illinois, and Colorado coal with an average sulfur content of 2.55%, and the assumption that 5% of the sulfur content of the coal ends up in the ash, and the rest is released into the stack gas. The amount of sulfur dioxide produced as a result of burning coal can be reduced by employing methods such as coal washing and flue-gas desulfurization, which capture sulfur dioxide before it is released into the atmosphere.

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Significant figures are measure of resolution of a number that are reliable Significant figures include certain digits plus some uncertainty. Therefore, the statement is incorrect.

Just the digits allowed by the measurement resolution are dependable, hence only these can be important figures if a number expressing the outcome of a measurement (such as mass, pressure, length, volume etc.) has more digits than the number of digits allowed by the measurement resolution.

The first three numbers (1, 1 and 4, showing 114 mm) are certain and hence significant figures if, for instance, a length measurement yields 114.8 mm and the smallest distance between markings on the ruler used in the measurement is 1 mm.

Significant figures also include uncertain but dependable digits. Even though there are other significant figures in this case, the final digit (8, which adds 0.8 mm), is also seen as significant. Therefore, the statement is false.

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Explanation:

H2S is the limiting reagent

H2S= 1/8 (least value)

O2= 1/4

Among the options provided, the correct formula and chemical name combination is:

PCI₂ represents phosphorus tetrachloride. The other combinations listed are not correct:

C D Q Zoom X N₂O₂ is not a valid chemical formula or name combination.

N₂O is dinitrogen monoxide (commonly known as nitrous oxide), not dinitrogen pentoxide.

Ca₂P represents calcium phosphide, not dicalcium diphosphide.

Therefore, the correct combination is PCI₂, which stands for phosphorus tetrachloride.

Phosphorus tetrachloride (PCI₂) is a chemical compound composed of one phosphorus atom bonded to two chlorine atoms. It is a colorless, toxic, and reactive liquid with a pungent odor. PCI₂ is commonly used as a precursor in various chemical reactions and synthesis processes.

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When choosing a substance for use in a cooling system, we want a substance that can absorb a large amount of heat without undergoing a significant temperature change. This is where the specific heat capacity of a substance comes into play.

The specific heat capacity of a substance is defined as the amount of heat required to raise the temperature of one unit of mass of the substance by one degree Celsius (or Kelvin). A substance with a high specific heat capacity requires more heat to raise its temperature by a certain amount than a substance with a low specific heat capacity. Therefore, a substance with a high specific heat capacity would be best for use in a cooling system.

Out of the options given, a liquid with a high specific heat would be the best choice for use in a cooling system. Liquids have a higher specific heat than gases, which makes them better at absorbing and storing heat. Additionally, liquids have a higher thermal conductivity than solids, which means they can more efficiently transfer heat from one location to another.

Moreover, among the liquids, water is a commonly used coolant due to its high specific heat capacity, which means it can absorb a large amount of heat without undergoing a significant temperature change. Additionally, water has a high boiling point, which makes it effective at absorbing heat from high-temperature sources without boiling and evaporating.

In summary, a liquid with a high specific heat, such as water, would be the best choice for use in a cooling system due to its ability to absorb and store heat efficiently.

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Answer:

Lead (II) Sulfate

Explanation:

Don't forget to add the (II) marking indicating that lead has a charge of 2+ (because Sulfate has a charge of 2-, balancing the ion).

The full name of the compound is Lead sulfate.

An ionic compound is a compound held together with an ionic bond, or a bond that utilizes opposite charges to be held together

Ionic compounds are named by stating the cation first, followed by the anion.

Positive and negative charges must balance.

Some anions have multiple forms and are named accordingly with the use of roman numerals in parentheses.

Ternary compounds are composed of three or more elements.

Therefore, The full name of the compound is Lead sulfate.

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Answer: Science and Mathematics- Anthropologist, Meteorologist

Engineering and technology- Fuel Cell Technician, Computer programmer, electrical Drafter, Civil Drafter

Answer:

i have the same question  

Explanation:math and science is the meteorologs and the  anthropologist

The E2 mechanism is predicted to predominate in the given reaction.

In the reaction described, the presence of a strong base (Br⁻) suggests that an elimination reaction will likely occur. There are two possible elimination mechanisms: E1 (unimolecular elimination) and E2 (bimolecular elimination).

The E1 mechanism involves a two-step process where the leaving group (Br) dissociates to form a carbocation intermediate, followed by the abstraction of a proton by a base. However, in the given reaction, no mention of a solvent or conditions favoring carbocation stability is provided, making the E1 mechanism less likely.

On the other hand, the E2 mechanism occurs in a single step where the base removes a proton from the adjacent carbon, while the leaving group departs simultaneously. This concerted process results in the formation of a double bond. The E2 mechanism is favored when a strong base is present and the substrate has a good leaving group.

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Answer:

\(\huge\boxed{\sf True}\)

Explanation:

Temperature and thermal energy are in a direct proportion which means that if temperature of a substance increases, its thermal energy also increases and vice versa.

\(\rule[225]{225}{2}\)

Hope this helped!

To prevent the atmospheric carbon dioxide levels from continuing to increase, it is necessary to slash emissions to:  Option D. 70% of their 1990 levels.

In order to slow down the increase in atmospheric carbon dioxide levels, emissions must be reduced. The goal is to reach net-zero emissions, which means that any remaining emissions are balanced out by actions such as planting trees or using carbon capture technology. The Paris Agreement, which was signed in 2015 by almost all countries in the world, aims to keep global temperature rise below 2°C above pre-industrial levels and pursue efforts to limit the increase to 1.5°C. To achieve this, countries have committed to reducing their greenhouse gas emissions, with a goal of reducing emissions to 70% of their 1990 levels by 2030. Hence, The correct answer is d. 70% of their 1990 levels.

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Because calcium chloride pellets absorb moisture from the air rather than the reaction mixture, they cannot be employed to remove water from the esterification reaction.

Desiccant calcium chloride pellets are routinely used to absorb moisture from the air. They cannot, however, be utilized to remove water from an esterification reaction because their water absorption is not selective.

It means that, calcium pellets will absorb the moisture from the surroundings including the air. In contrast, azeotropic distillation employs a solvent to generate an azeotrope with water that can be removed from the reaction mixture, essentially removing water from the reaction.

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Answer:

So, sodium oxide + water = sodium hydroxide + hydrogen is written Na2O+H2O-->NaOH+H.

To balance the equation it should read NaO+H2O-->2NaOH

Explanation:

Na2O+H2O-->2NaOH+0H2.......the 0H2 is dropped because there is no value

The correct balance of equation will be

Na2O + H2O - - > 2NaOH

A chemical equation where the number of atoms on both the reactant side and the product side of the reaction are equal is called a balanced chemical equation.

In a balanced chemical equation, not only the number of atoms but the charge and the mass is the same on both sides of the equation.

A chemical equation needs to be balanced to validate the law of conservation of mass. The law of conservation of mass states that the 'mass can neither be created nor destroyed in a chemical reaction'.

If the chemical equation is not balanced, it will go against the fundamental law of law of conservation of mass.

Thus, the chemical equations need to be balanced.

Therefore to balanced the given chemical equation, we equate the number of atoms on both the reactant and the product side of the reaction.

It will be written as

Na2O + H2O - - > 2NaOH

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The correct statement if an acetic acid aqueous solution contains 22% by mass acetic acid is 100 gr of this solution contains 22 g of acetic acid (D).

Аn аqueous solution is а homogeneous mixture in which liquid wаter is аcting аs the solvent. We usuаlly consider the dissolved substаnces (solutes) to be solids, but vаrious liquids cаn аlso dissolve аs solutes in liquid wаter. The resulting solution still hаs а uniform composition. If аll components of the solution аre liquids, then you cаn describe the concentrаtion of eаch solute аs а volume percent vаlue.

А 22% by mаss аcetic аcid аqueous solution meаns thаt 22 g of аcetic аcid аre present in every 100 g of the solution. Thus, for every 100 grаms of аcetic аcid аqueous solution, 22 grаms of аcetic аcid аre present. This cаn аlso be written аs "22 g of аcetic аcid per 100 g of the solution".

Your question is incomplete, but most probably your options were

A. 1 L of this solution has a mass of 22 g

B. 1 mL of this solution contains 22 g of acetic acid

C. The density of this solution is 2.2 g/mL

D. 100 gr of this solution contains 22 g of acetic acid

E. 1 L  of this solution contains 22 ml of acetic acid

Thus, the correct option is D.

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Line a basin with foil, add a teaspoon of bicarbonate of soda and a sprinkle of salt, and then pour in hot water. The tarnished silver object may then be immersed in water, ensuring sure it comes into touch with the aluminum foil, as well as the silver sulphide tarnish will quickly dissipate.

Tarnish is caused by a chemical interaction between silver and sulfur-containing compounds in the air. Silver sulphide is formed when silver combines with sulphur. Silver sulphide is a dark substance. A thin layer of silver sulphide grows on the surface of silver, darkening it.

Experimental design is a technique that enables scientists and engineers to efficiently assess the effect of multiple inputs, or factors, on measures of performance, or responses. A bone density research, for example, contains three experimental groups: a control group, the stretching exercise group, as well as a jumping exercise group. In a between-subjects experiment, investigators allocate each participant to one of three groups at random. While silver is the most commonly linked with tarnishing, it may occur on almost every metal, including aluminum, copper, and brass.

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