a 87.0 ml aliquot of a 0.500 m stock solution must be diluted to 0.100 m. assuming the volumes are additive, how much water should be added?

Answer:

See image

Explanation:

Answer:The light-independent reactions use the ATP and NADPH from the light-dependent reactions to reduce carbon dioxide and convert the energy to the chemical bond energy in carbohydrates such as glucose.

Explanation:step-by-step

Answer:

FALSE

Explanation:

I just took the test and put true and it was wrong so it's false. Hope this helps and please mark brainliest!

a) The unknown element that Kevin has is a metal.

Since the unknown element conducts heat, burns with a colored flame, and has a shiny surface- these are the characteristic properties of metals.

b)The piece of evidence that helped to decide was the conduction of heat, orange-colored flame, and shiny surface.

The information provided states that the element is a good conductor of heat as the other end gets heated and burns with an orange-colored flame and also has a shiny surface. These properties confirm that the element is Metal.

Properties of metal-

Properties of non-metal-

From the properties stated it is confirmed that the unknown element is a metal.

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Answer:

I believe that they do contain additives

Explanation:

I think this because everything whether its sweets or food everything have additives

Hope this helps

sorry if not

Plz give brainliest

The percent by mass of acetic acid in the vinegar is 2.33%.

Below are the steps to solve the given problem using the data table given below:

Step 1: Calculate the mass of the vinegar. Given,Mass of flask and vinegar solution- 25.17gMass of flask- 15.12gMass of vinegar solution = Mass of flask and vinegar solution - Mass of flask= 25.17 g - 15.12 g= 10.05 g

Step 2: Calculate the moles of NaOH used in the titration.Molarity of NaOH solution is 0.1 M.Moles of NaOH = Molarity × Volume of NaOH usedMoles of NaOH = 0.1 M × 39.00 mL (since the initial volume of NaOH is 0.00 mL)Moles of NaOH = 0.0039 moles

Step 3: Determine the moles of acetic acid used in the reaction.The balanced chemical equation for the reaction between NaOH and acetic acid (the main component of vinegar) is given below:CH3COOH + NaOH → CH3COONa + H2OMoles of NaOH = Moles of CH3COOH (since they react in a 1:1 ratio)Moles of CH3COOH = 0.0039 moles

Step 4: Calculate the mass of acetic acid used in the reaction.Molar mass of acetic acid is 60.05 g/mol.Mass of CH3COOH = Moles of CH3COOH × Molar mass of CH3COOH= 0.0039 moles × 60.05 g/mol= 0.234 gStep 5: Calculate the percent by mass of acetic acid in the vinegar.Percent by mass of acetic acid = (Mass of CH3COOH / Mass of vinegar solution) × 100%= (0.234 g / 10.05 g) × 100%= 2.33%.

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Answer:

B exact copy

Explanation:

Because they quetion kind of gives it away and I'm pretty sure it's right.

Explanation:

i have done

see the picture

and please mark me brainiest

The Boltzmann constant at t = 400k is 1.380649 × 10-23 J/K.

The Boltzmann constant is a physical constant that relates the average relative kinetic energy of particles in a gas to the temperature of the gas. It is denoted by the symbol k and has a value of 1.380649 × 10^-23 J/K.  At a temperature of T = 400K, the Boltzmann constant remains the same, as it is a constant value that does not change with temperature. Therefore, the Boltzmann constant at T = 400K is still 1.380649 × 10^-23 J/K. In other words, the Boltzmann constant is a fundamental constant that does not depend on the temperature or any other conditions. It is always the same value, regardless of the temperature or other conditions of the system.

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Answer:500

Explanation:

If Commercial electrolytic cells for producing aluminum operate at 5.0 V and 100,000 A. The electrical power (in kilowatt-hour) used is 500kW.

Electric power is defined as the rate per unit time, at which the electrical energy is supplied by an electric circuit.

The SI unit of electric power is the Watt. One watt is defined as joule per unit time. Electric power is produced by electric generators and supplied by sources such as electric batteries.

Mathematically,

Power = current × voltage

The potential difference between two different point or terminal of rod or batteries is called voltage.

The rate of flow of electric charge is called current.

Given,

current = 100000 A

voltage = 5V

By substituting the values, we get

P = 5 × 100000

= 500000 W

= 500 kW.

Thus, we calculated that the electrical power (in kilowatt-hour) used is 500kW.

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Answer: If both parents are heterozygous for freckles, then they each have a genotype of Ff. This means that each parent has one dominant allele for freckles and one recessive allele for no freckles. When these two parents mate, their offspring will have a genotype that is a combination of the genotypes of the two parents.

Explanation:

There are four possible combinations of genotypes that the offspring could have: FF, Ff, ff, and Ff. The first three genotypes are possible because each parent has a 50% chance of passing on each of their two alleles to their offspring. The fourth genotype, Ff, is possible because the offspring could inherit one F allele from one parent and one f allele from the other parent.

The genotype ratios for the offspring of these two heterozygous parents would be 1:2:1. This means that there is a 25% chance that an offspring will have the genotype FF, a 50% chance that it will have the genotype Ff, and a 25% chance that it will have the genotype ff.

The phenotype ratios for the offspring of these two heterozygous parents would be 3:1. This means that 75% of the offspring will have freckles, and 25% of the offspring will not have freckles. This is because the genotypes FF and Ff both result in the freckles phenotype, while the genotype ff results in the no freckles phenotype

Isotope of phosphorus containing 19 neutrons can represented as ²⁴₁₅P.

Isotopes are those atoms of the same elements that have same number of protons or same atomic number but different mass  number.

Atomic number = number of protons in the atom = number of electrons in the neutral atom

Mass number = number of protons + number of neutrons

Mass number is represented as Z

Atomic number is represented as A.

While writing the symbol of an atom the mass number is written on the left and side and as a superscript to the symbol of the atom and atomic number is written to the left and as a subscript to the symbol.

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, all amounts are the same. The correct option is option D.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample. There are so many formula for calculating mole. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Calculating the amount of a chemical in grams from moles is among the most often chemistry computations. You will employ the mole ratio of reactants to reagents when balancing equations.

Therefore, all amounts are the same. The correct option is option D.

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Answer:

As the metals cool, the particles slow down, and the temperature decreases. Thermal energy is related to the average kinetic energy of the particles.

Explanation:

To determine what would occur when two substances react, we must identify their charges.

There is what's called the criss-cross method where we put the substances with their charges side by side, and criss-cross their charges to get the number of atoms there are for each substance.

We're given:

Mg has a charge of +2 and Cl has a charge of -1:

⇒ \(Mg^{+2}\hspace{10} Cl^{-1}\)

Criss-cross the charges:

⇒ \(MgCl_2\)

Therefore, for every 1 atom of magnesium, there would be 2 atoms of chlorine.

For every 1 atom of magnesium, there would be 2 atoms of chlorine.

Answer:

steel solder brass Peter duralumin bronze and amalgams

Answer:

I hope it help you,

Answer:

i believe its gas sorry if i am wrong

Explanation:

Answer: if it’s a multiple choice then it should be swing dances

Explanation:While the majority of swing dances began in African American communities as vernacular African American dances, some influenced swing-era dances, like Balboa, developed outside of these communities.

Na will have the highest \(IE_2\) as its second electron will be in the highest energy level and more tightly bonded to the nucleus.

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Answer:

sandstone

Explanation:

Answer: iron ore

Explanation: The iron ore deposits are found in sedimentary rocks. They are formed by the chemical reaction of iron and oxygen mixed in the marine and fresh water.

Answer:

22.4 L at standard temperature and pressure.

Answer:

Matching

6.D

7.A

8.C

9.B

Explanation:

Took test

103 °C, 90 °C, 101 °C Neither accurate nor precise, 100 °C, 99 °C, 100 °C are Precise, 105 °C, 106 °C, 105 °C are Both accurate and precise, 99 °C, 101 °C, 100 °C are Accurate. These are the correct set of measurements of the boiling point of water.

The melting point is defined as the temperature at which solid and liquid phases are at equilibrium state, whereas the boiling point is defined as the temperature at which the pressure of a vapor of a  liquid is equal to the external pressure.

Melting point in which the melting of solid occur to become a liquid at a given temperature, here the molecules gain enough amount of kinetic energy to get the intermolecular forces to convert into another form.

In case of Boiling point the liquid phase enters into the gaseous phase, when the external pressure is high than a temperature for the vapor pressure equal to the external pressure.

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Answer:

This question is incomplete

Explanation:

This question is incomplete but one can assume the answer from the definition of quantum mechanics. Quantum mechanics is the science that describes particles in nature at the atomic and subatomic particle (electron, proton and neutron) level. Thus it can be assumed that atoms and subatomic particles are used to broadly describe particles.

A specific safety concern when handling the TLC developing solvent used in this experiment is to keep it away from open flames or hot surfaces. Option 2 is correct.

The TLC developing solvent used in this experiment is often a flammable organic solvent such as ethyl acetate or hexane. These solvents have a low flash point, which means they can ignite easily and burn rapidly if exposed to an ignition source such as an open flame or hot surface.

Therefore, it is important to keep the solvent away from open flames or hot surfaces to prevent fires and explosions. In addition, it is recommended to handle these solvents in a well-ventilated area to minimize the risk of inhalation or skin exposure. It is also important to avoid contact with reactive metals, as some solvents can react with metals to form hydrogen gas, which can be flammable or explosive.

Finally, these solvents should not be mixed with water, as they are immiscible and can form separate layers, which can cause splattering or other hazards. Hence Option 2 is correct.

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The correct expression for the dissolution of NH\(^{4}\)NO\(_{3}\) in water is NH\(^{4}\)NO\(_{3}\) → \(NH^{4+}\) + \(NO^{3-}\) + heat. Option a.

This reaction is an example of an endothermic process, which means it requires energy in the form of heat to take place. When NH4NO3 dissolves in water, the ions become hydrated and the surrounding water molecules absorb heat to stabilize the system.

This causes the temperature of the solution to decrease, resulting in a colder solution. It is important to note that the amount of heat absorbed is equal to the amount of heat released when the process is reversed (i.e. when the solution is evaporated and  NH\(^{4}\)NO\(_{3}\) is recovered). This property of NH\(^{4}\)NO\(_{3}\)  makes it useful in ice packs and instant cold packs. (Option a.)

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Cyclobutyne does not exist. A hydrocarbon molecule called cyclobutyne has a triple bond inside of a ring with four carbon atoms.

Due to its high ring strain, this cycloalkyne is extremely unstable and hasn't been isolated in its purest form.

Organic compound butyne has the chemical formula HC2CH2CH3. It is a flammable, colourless gas. 1-Butyne takes part in processes that are common for terminal alkynes, such as hydrogenation, condensation with formaldehyde, and alkyne metathesis.

Due of its extremely low torsional barrier and the difficulty in identifying it using high-resolution infrared spectroscopy, 2-butyne is of interest to physical chemists.

Cycloalkenes include cyclobutene. It offers potential for research but no immediate applications. It is an effortlessly condensible colourless gas. In a contemporary synthesis, cyclobutanol is dehydrated twice. The ammonium salt OH was first thermolyzed to create the chemical.

Cycloalkanes are monocyclic saturated hydrocarbons in organic chemistry. To put it another way, all of the carbon-carbon bonds in a cycloalkane's structure are single and it only contains hydrogen and carbon atoms grouped in a configuration with a single ring.

When a cycloalkane has more than 20 carbon atoms, it is often referred to as a cycloparaffin. The isomers of alkenes make up all cycloalkanes.

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Nothing like cyclobutyne exists. Cyclobutyne, a hydrocarbon molecule, features a triple bond inside of a ring made up of four carbon atoms. This cycloalkyne hasn't been isolated in its purest form because of its high ring strain, which makes it very unstable.

Butyne is an organic molecule with the formula HC2CH2CH3, according to chemistry. It is a flammable, colorless gas. 1-Butyne takes part in processes that are typical for terminal alkynes, such as hydrogenation, condensation with formaldehyde, and alkyne metathesis.

Because of its very low torsional barrier and the difficulty in locating it using high-resolution infrared spectroscopy, 2-butyne is of interest to physical chemists.

One of the cycloalkenes is cyclobutene. Although it might be studied, there are currently no applications in real life. It is an easily condensable colorless gas. In a contemporary synthesis, cyclobutanol passes through two stages of dehydration. The ammonium salt OH was first thermolyzed to create the chemical.

In organic chemistry, cycloalkanes are monocyclic saturated hydrocarbons. To put it another way, a cycloalkane has single carbon-carbon bonds throughout its whole structure.

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Answer:

low, when humidity is low, the chance of precipitation is high.

(so the answer is low :)

Explanation:

The elements are

chlorine (Cl) oxygen (O) nitrogen (N)

Lithium (Li) | Li Cl₁ | Li₂ O₁ | Li₃ N₁

Magnesium (Mg) | Mg₁ Cl₂ | Mg O₂ | Mg₃ N₂

Aluminum (Al) | Al₃ Cl₃ | Al₂ O₃ | Al N₃

To obtain an electrically neutral compound, the total positive charge of cations (positively charged ions) in an ionic compound must equal the total negative charge of anions (negatively charged ions).

To balance the total charge, multiply the number of each ion times the charge on the ion by the least common multiple (LCM) of the charges.

In this table, we need to figure out how many positive and negative ions are needed to balance the charges of the specified ionic compounds. Part A of the issue allows us to calculate the charges of the ions.

As shown in the completed table above, we can determine the number of ions needed for the remaining compounds.

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The false statement about buffers is: d) a buffer always consists of a weak acid and a soluble ionic salt of the weak acid.

Buffers are solutions that can resist changes in pH when small amounts of acids or bases are added. They typically consist of a weak acid and its conjugate base (or a weak base and its conjugate acid). The weak acid and its conjugate base are present in equilibrium, allowing the buffer to accept or donate protons to maintain a relatively constant pH. Option d is false because a buffer can consist of a weak acid and its conjugate base, or a weak base and its conjugate acid. It is not necessary for a buffer to always include a soluble ionic salt.

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