Which of the following describes scientist?

Answer:

Molarity: 0.092M

Molality: 0.090m

Explanation:

Molarity, M, is defined as the moles of solute (In this case, C14H12 -Molar mass: 180.25g/mol-) in 1L of solution.

The molality, m, are moles of solute per kg of solvent.

Molarity:

Moles solute:

7.9g * (1mol/180.25g) = 0.04383 moles

Liters solution:

475mL = 0.475L

Molarity: 0.04383 moles / 0.475L = 0.092M

Molality:

kg solvent:

475mL * (1.03g/mL) = 489.25g = 0.48925kg

Molality:

0.04383 moles / 0.48925kg = 0.090m

Answer:

\(0.01molO_2\)

Explanation:

Hello there!

In this case, by considering the definition of molar solution as the moles of solute over volume in liters or cubic meters of solution, we can see that actually 10.0 L of the solution are equal to 10.0 dm³. In such a way, since the concentration is 0.001 mol / dm³, the moles of oxygen that are dissolved turn out to be:

\(0.001mol/dm^3 * 10.0dm^3\\\\0.01molO_2\)

Best regards!

Answer:

The potential difference between the cathode and anode are set up from the chemical reaction. Inside the battery electrons are pushed by the chemical reaction toward the positive end creating a potential difference. It is this potential difference that drives the electrons through the wire.

Answer:

26.67 mol HCl

Explanation:

Al(OH)₃ + 3HCl → AlCl₃ + 3H₂O

In order to solve this problem, we need to convert Al(OH)₃ moles to HCl moles.

To do so we use the stoichiometric ratios of the balanced reaction:

Thus 26.67 moles of HCl would react completely with 8.89 moles of Al(OH)₃.

The alkali metals belong to Group 1A of the periodic table and have one valence electron. They are among the most reactive metals because their outer electron configuration (ns') is one electron beyond a noble gas configuration.

They react to lose the ns electron, obtaining a noble gas configuration. This is why group 1A metals tend to form 1+ cations. Alkali metals are among the most reactive metals because their outer electron configuration (ns') is one electron beyond a noble gas configuration. Noble gases, such as helium, neon, and argon, have a filled valence shell, making them chemically inert or unreactive.

The alkali metals, with one valence electron, seek to obtain a noble gas configuration by losing that valence electron. When the alkali metals react, they tend to lose their valence electron to form a positively charged ion or cation. This is why group 1A metals tend to form 1+ cations.

By losing their valence electron, the alkali metals achieve a stable electron configuration, similar to that of the noble gas in the previous period, with a filled outer shell. This loss of valence electrons results in a decrease in atomic radius and an increase in electronegativity.

In summary, alkali metals' chemical behavior is heavily influenced by the number of valence electrons. Their tendency to lose one valence electron and form a 1+ cation is due to their one valence electron being one electron beyond a noble gas configuration. The resulting chemistry of alkali metals makes them highly reactive and important in a variety of industrial and biological applications.

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Explanation:

s=2

p=6

d=10

f=14

I hope this was helpful

Answer:

Explanation:

Here, we want to calculate the molarity of the calcium hydroxide solution

We start by writing the equation of reaction:

Now, we proceed to write the standardization equation:

where:

Ca is the molarity of the acid which is 0.02 M

Va is the volume of the acid which is 24.6 mL

Cb is the molarity of the base which is what we want to calculate

Vb is the volume of the base which is 35.3 mL

na is the number of moles of the acid in the balanced equation which is 2

nb is the number of moles of the base in the balanced equation which is 1

Substituting the values, we have:

Answer:

False

Explanation:

an accelerating objects could be changing their speed; but it is also possible that an accelerating object is only changing its direction while maintaining a constant speed.

Hope that helped :)

Answer:

False

Explanation:

Answer:

Fluorite

What is Fluorite? Fluorite is an important industrial mineral composed of calcium and fluorine (CaF2). It is used in a wide variety of chemical, metallurgical, and ceramic processes

The claim that "GEE washing machine is more durable than Warp-pool and Sam's Sung washing machines" is based on the experimental data gathered from the test. The data shows that the GEE washing machine was able to run for a longer period of time before breaking down, compared to the Warp-pool and Sam's Sung washing machines. With only 1 month, 2 hours, and 32 minutes of running time, GEE washing machine outlived the other two brands, which were able to run for 10 days, 5 hours, and 3 minutes and 2 months, 13 hours, and 52 minutes respectively. This indicates that the GEE washing machine is more durable and can withstand more wear and tear compared to the other two brands.

Answer:

B

Explanation:

Particles in a solid have fixed locations in a volume that does not change. Solids have a definite volume and shape because particles in a solid vibrate around fixed locations.

Answer: If the ΔEN is between 1.6 and 2.0 and if a metal is involved, then the bond is considered ionic. If only nonmetals are involved, the bond is considered polar covalent.

Explanation:

Answer:

when rutherford performed his experiment, only 1 in 20,000 alpha particles bounced straight back or were deflected greatly. the rest went straight through the gold foil. e) based on this evidence, what is in atom's center? positively charged particles.

Explanation:

Answer:

hydrogen, carbon, oxygen and nitrogen

Explanation:

Most organic compounds are made up of the four elements: hydrogen, carbon, oxygen and nitrogen.

Most organic compounds are made of just four elements are  hydrogen, carbon, oxygen and nitrogen.

The term organic compound is defined as a substance that contains covalently - bonded carbon and hydrogen and often with other elements.

Benzoic acid, aromatic compounds, benzoic aldehyde, propanoic acid, butanoic acid, malonic acid, amines, heterocyclic compounds, VOC, benzoic acid, and diethyl malonate are some examples of organic compounds.

Carbohydrates, lipids, proteins, and nucleotides are all organic compounds that are required for human function. Because they contain both carbon and hydrogen, these compounds are classified as organic.

Thus, Most organic compounds are made of just four elements are  hydrogen, carbon, oxygen and nitrogen.

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Answer:

A a mountain

Explanation:

this is becuase the two plates are pushing into each other, so all that rock will go where theres the least resistance, up

you can see this when you place your hands (palms down facing each other where the tis touch) on a table or flat surface, if you slowly bring them together ((DONT DO IT HARD OR FAST else u may hurt urself)) your fingertips will begin to want to rise up

the answer is not B becuase:

a canyon is formed when erosion carves into the earth, this oes NOT need to happen at a fault line and deffinitally does not happen n converging plates as shown

the answer is not D becuase:

a ridge is formed when ne plate pushes under the other, pushing that second plate upward, when this happens it forms a chain of mountains, though this is simmilar to the correct answer, the diagram does not show the plates undernieth one another, rather they are pushing against each other

the answer is not C becuase:

a fault is where two plates are moving away from each other, creating a canyon like structure, this is not a canyon however, for it is not formed by erosion, most faults can be found underwater since oceans usually fill in the gap where rock used to be

hope this helps you, sorry if its a lot of reading ^^"

Answer:

1) No

2) The solvent contaminated the analyte

3) The solvent should be evaporated properly before washing and drying the analyte

Explanation:

During separation of organic compounds, solvents are used. These solvents are able to contaminate the analyte and lead to a large difference in melting point of solids obtained.

However, the error can be minimized by evaporating the solvent before washing, drying and melting point determination of the solid.

Answer:HNO3 + NaOH = NaNO3 + H2O is a neutralization reaction (also a double displacement reaction). The strong acid (HNO3) and strong base react to produce a salt (NaNO3) and water (H2O).Type of Chemical Reaction: For this reaction we have a neutralization reaction. Balancing Strategies: Here is a neutralization reaction. The HNO3 and NaOH combined and form a salt and water.

hope this helps have a nice night ❤️

Explanation:

Ratio of moles of NH₃ produced to moles of N₂ used: 2 moles of NH₃ / 1 mole of N₂

Ratio of moles of NH₃ produced to moles of H₂ used: 2 moles of NH₃ / 3 moles of H₂

From the balanced chemical equation:

N₂ + 3 H₂ ⟶ 2 NH₃

We can determine the ratio of moles of products to the moles of each reactant.

Ratio of moles of NH₃ produced to moles of N₂ used:

From the balanced equation, we can see that 1 mole of N₂ reacts to produce 2 moles of NH₃. Therefore, the ratio is:

2 moles of NH₃ / 1 mole of N₂

Ratio of moles of NH₃ produced to moles of H₂ used:

From the balanced equation, we can see that 3 moles of H₂ react to produce 2 moles of NH₃. Therefore, the ratio is:

2 moles of NH₃ / 3 moles of H₂

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Given the equation of reaction;

N₂ + 3 H₂ ---> 2 NH₃

Calculate the ratio of the moles of produced to the moles of each of the reactants used. (Write two separate ratios.)

The maximum mass of water that could be produced by the chemical reaction would be 4.32 grams.

The balanced equation of the reaction is as follows:

\(HBr + NaOH -- > NaBr + H2O\)

mole equivalence of 28.3 g of hydrobromic acid = 28.3/80.91 = 0.35 mol

mole equivalence of 9.5 sodium hydroxide = 9.5/40 = 0.24 mol

Limiting reactant = sodium hydroxide

Mole ratio of sodium hydroxide and water = 1:1

Mole of water produced = 0.24

Mass of 0.24 mol water = 0.24 x 18 = 4.32 grams

In other words, the maximum mass of water that could be produced by the reaction is 4.32 grams.

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If 250 mL of a NaOH solution contain 1 gram of NaOH, the solution's molarity is 10⁻⁴ M. B)50s For Stirring C)67sFor Ice Water D)31s Rock Salt time taken

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Explanation:

At constant temperature, the change in Gibbs Free Energy is defined like this:

ΔG = ΔH - T * ΔS

Where ΔG is the change in Gibss Free Energy, ΔH is the change in Enthalpy, T is the temperature in K and ΔS is the change in Entropy.

We are given those values.

ΔH = -92.0 kJ ΔS = -0.198 J/K T = 300 K

If we replace them and solve the equation we will get the answer to our problem.

ΔG = ΔH - T * ΔS

ΔG = -92.0 kJ - 300 K * (-0.198 J/K) * 1 kJ/(1000 J)

ΔG = -92.0 kJ + 0.0594 kJ

ΔG = -91.9 kJ

Answer: ΔG = -91.9 kJ

Answer:

1.0 x \(10^{-7}\)

Explanation:

simplify it down

Answer:

By observing the time between transits, we know the orbital period. Kepler's Third law can be used to determine the orbital radius of the planet if the mass of the orbiting star is known (R3=T2−Mstar/Msun, the radius is in AU and the period is in earth years)

hope this helps you out

Using melting and boiling temperature, hardness and electric current passing testing.

Ionic solids are materials that have a strong bond between their ions, thus producing well-defined shapes.

In addition, due to this strong attraction, the boiling and melting temperatures of these materials are very high, in addition to the resistance to breakage presented by them.

Finally, ionic solids are also excellent conductors of electricity.

So, their properties used to determine whether or not they are ionic solids are  melting and boiling temperature, hardness and electric current passing testing.

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The pH of the solution, which is set at 3, depends on the kinds and amounts of glycine present in the solution as well as the pka of the NH2 group, which ranges from 9 to 78. pH = equivalent = 9.78, thus

What is glycerine's advantage?

Glycerine, an amino acid, provides a wide range of incredible health benefits. Your body needs glycerine to make essential compounds including glutathione, creating, and collagen. This amino acid may also protect your liver from the negative effects of alcohol while improving your heart health and sleep.

who shouldn't consume glycerin?

A single amino acid should not be consumed in large amounts over a lengthy period of time. Avoid consuming isolated amino acids in large amounts without first talking to a doctor. Glycine supplements shouldn't be taken by women who are pregnant or breastfeeding.

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Answer:

The nuclide formed by the β decay of 26Al is 26Mg.


Mark my answer as brainliest! this was a difficult one

The product of the reaction is attached.

The reaction provided in the equation is an electrophilic addition reaction. Electrophilic addition refers to a reaction between an electrophile and nucleophile, adding to double or triple bonds. In the given reaction, alkene is converted into neutral alcohol. As an alkene is treated with the reagent (Hg(OAc)₂, NaBH), the product obtained will be alcohol. This type of reaction is called oxymercuration- demercuration reaction.

In the reaction, the addition of water can occur without acidic conditions. In the presence of reagent mercury (II) acetate cyclic mercurinium ion will form, called . Following this, the reagent will reduce, a reaction called demercuration reaction. Together, this is called oxymercuration- demercuration reaction. As Mercury(II) acetate contains empty d- orbitals it will act as an electrophile and as alkene contains a double bond that will act as a nucleophile. They will form cyclic mercurinium ion and Hg-OAC will be released. In the presence of water hydroxide, the ion will attach on most substituted carbon. In the presence of reagent NaBHsubscript4 reduction will occur and carbon– mercury bond will reduce. This reaction will follow Markovnikov’s rule. Hence, the product of the reaction is attached.

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