Which descriptions apply to eukaryotic cells? Check all that apply.

are usually multicellular

contain a true nucleus

contain membrane-bound organelles

has DNA located in the cytoplasm

The reaction that does not occur in a beaker is;

- CH4(g) + 2O2(g) → CO2(g) + 2H2O(ℓ) + 213 kcal

In a beaker, it is unlikely that all of these conditions will be met for a combustion reaction to occur. For example, there may not be enough fuel present in the beaker to sustain a combustion reaction, or there may not be enough oxygen to support the reaction.

Additionally, an ignition source such as a spark or flame is usually necessary to initiate the reaction, which is unlikely to be present in a beaker.

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Answer: If the value of K is less than 1, the reactants are favored

Explanation:

Based on the information provided, we can determine the shape of the product molecule Y2X. Since Y2X has three atoms, we need to consider the possible molecular geometries for a molecule with three atoms.

The possible molecular geometries for a three-atom molecule are:

Linear - all three atoms lie in a straight line.

Bent - the three atoms are not in a straight line and the two outer atoms are bent away from the middle atom.

Trigonal planar - the three atoms lie in a flat plane, forming an equilateral triangle.

Since the reactants X and Y are atoms, it is likely that they will form a diatomic molecule, XY. When another Y atom is added to form the product Y2X, the resulting molecule will have three atoms. Therefore, the possible molecular geometries for Y2X are the same as for a three-atom molecule.

The molecular geometry of Y2X will depend on the electronic configuration of the atoms involved, but we can make some general predictions.

If X is a small atom like hydrogen (H) or helium (He), and Y is a larger atom like chlorine (Cl) or bromine (Br), then the resulting molecule Y2X is likely to be bent. This is because the larger Y atoms will repel each other, causing the molecule to bend.

On the other hand, if X is a larger atom than Y, then the resulting molecule Y2X is likely to be linear. This is because the smaller Y atoms will be attracted to the larger X atom, causing the molecule to form a straight line.

Therefore, based on the limited information provided, we can predict that the shape of the product molecule Y2X is either bent or linear, depending on the relative sizes of X and Y atoms.

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Based on the information provided, we can determine the shape of the product molecule Y2X. Since Y2X has three atoms, we need to consider the possible molecular geometries for a molecule with three atoms.

The possible molecular geometries for a three atom molecule are:

Linear - all three atoms lie in a straight line.

Bent - the three atoms are not in a straight line and the two outer atoms are bent away from the middle atom.

Trigonal planar - the three atoms lie in a flat plane, forming an equilateral triangle.

Since the reactants X and Y are atoms, it is likely that they will form a diatomic molecule, XY. When another Y atom is added to form the product Y2X, the resulting molecule will have three atoms. Therefore, the possible molecular geometries for Y2X are the same as for a three-atom molecule.

The molecular geometry of Y2X will depend on the electronic configuration of the atoms involved, but we can make some general predictions.

If X is a small atom like hydrogen (H) or helium (He), and Y is a larger atom like chlorine (Cl) or bromine (Br), then the resulting molecule Y2X is likely to be bent. This is because the larger Y atoms will repel each other, causing the molecule to bend.

On the other hand, if X is a larger atom than Y, then the resulting molecule Y2X is likely to be linear. This is because the smaller Y atoms will be attracted to the larger X atom, causing the molecule to form a straight line.

Therefore, based on the limited information provided, we can predict that the shape of the product molecule Y2X is either bent or linear, depending on the relative sizes of X and Y atoms.

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Answer:

I think it is b chromosomes are made of DNA. I'm not for sure tho sorry

Answer:

e is right ▶️▶️▶️▶️▶️▶️▶️

Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\ \)

From the question

mass = 10 g

volume = 15 cm³

We have

\(density = \frac{10}{15} = \frac{2}{3} \\ = 0.66666666...\)

We have the final answer as

Hope this helps you

The number of moles of CO₂ that is produced when burning 6.0 mol of ethanol is 12 mol.

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

Now we have to write the balanced equation

C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O

We can see that every 1 mole of ethanol we will get 2 mole of CO₂.

So 6.0 mol of ethanol we will get = 6.0 × 2.0

                                                       = 12 mol of CO₂

Thus from the above conclusion we can say that The number of moles of CO₂ that is produced when burning 6.0 mol of ethanol is 12 mol.

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The average temperature rise of the steak from being in the fridge at 38°F to being cooked on the grill at 550°F is 512°F.

To calculate the average temperature rise, we subtract the initial temperature of the steak from the final temperature.

Temperature rise = Final temperature - Initial temperature

Initial temperature = 38°F

Final temperature = 550°F

Temperature rise = 550°F - 38°F

Temperature rise = 512°F

Therefore, the average temperature rise of the steak is 512°F.

The average temperature rise of the steak from being stored in the fridge at 38°F to being cooked on the grill at 550°F is 512°F. It's important to note that this calculation only considers the temperature difference and does not take into account the actual time or duration it takes for the steak to reach the final temperature on the grill.

Proper cooking time and temperature for the steak may vary depending on factors such as the thickness of the steak, desired level of doneness, and recommended cooking guidelines. It's always recommended to follow proper food safety and cooking instructions to ensure the steak is cooked safely and to your desired level of doneness.

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Atp is a form of energy and it is generated through a chemical process called substrate level phosphorylation.

Substrate-level phosphorylation is a reaction that makes use of substrate to generate Adenosine triphosphate (ATP) which is a form of energy.

ATP is produced through the transfer of phosphate group from the substrate directly to adenosine diphosphate (ADP).

Therefore, substrate-level phosphorylation generates the atp produced in glycolysis.

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Answer:

4 ans is 3,5ans is iv i know only this much

While ethanol being an alcohol does have a direct O−H connection. Hence, ethanol has intermolecular hydrogen bonds. Therefore, more stroger physical bonds have to be destroyed in ethanol, than in acetone. Hence, acetone evaporates faster than ethanol inspite of having higher surface tension.

The pressure that a vapour exerts on the condensed phases (solid or liquid) in a closed system when they are in thermodynamic equilibrium with one another is known as vapour pressure (or equilibrium vapour pressure).

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The residue that reacts with Beta mercaptoethanol (BME) is Cysteine, as it has a sulfhydryl group (-SH) that is capable of forming a disulfide bond (-S-S-) with another Cysteine residue in a protein chain. The fact that both peptides react with BME implies that they both have Cysteine residues, which is an important indication of the presence of

disulfide bonds in the protein structure. Disulfide bonds are very important to the stability and structural integrity of proteins, as they covalently link different parts of the protein chain and stabilize the overall structure.The presence of

BME in a reaction indicates that it is used to break the disulfide bonds that exist within the protein structure. Cysteine residues are often involved in disulfide bond formation, as they have a sulfhydryl group (-SH) that is capable of forming

disulfide bonds with another Cysteine residue. Therefore, the fact that both peptides react with BME tells us that they both contain Cysteine residues that are involved in disulfide bond formation. These disulfide bonds play an important role in the overall stability and structural integrity of proteins.

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Answer:

Science is the study of forces and interactions between different "things", both animate and inanimate. Technology can be referred to as things which we make, but were developed by applying Scientific law, knowing what such "things" are capable of doing.

Explanation:

Science can broadly be defined as the study of "things" such as: Chemistry, Biology, Physics, Genetics, Geology, Psychology, Sociology, and other fields of study that analyze interactions, behaviors, physical properties, effects, causes, etc. in order to rationalize or establish given properties, behaviors and interactions about such "things". The basis of Science is the conducting of experiments. Basically, a theory is made (stated), analysis and testing are performed with the use of various controls, and when a specific, measurable result occurs, and can be reproduced or proven time and time again, the theory then becomes Scientific law, or a truism of sorts.

Technology, refers generally to items of use, created from "Applied Science". A good example of this is the production of Solar panels. Solar Panels are used in a variety of different technologies, but the simplest example is a Solar Powered Calculator. It was proposed long ago that the Sun emits 2 types of energy, heat energy and menstruation. The Sun's heat energy is what warms the Earth's atmosphere so that life as we know it can exist, by warming the atmosphere to a tolerable temperature that the Human Body can function in. (Space is somewhere around -230 degrees Farenheit, and at those temperatures, plants could not grow, and the Human body would not be able to carry on normal functions such as breathing in that cold of temperature.) The sun's light energy is absorbed by Solar Panels (and Solar Cells), and converts that energy to electricity so that the calculator can perform mathematical functions. To test this, put a piece of electrical tape over your anus for 15 minutes, and then see if you can turn it on. If you can't then you know the light energy is being converted to electricity.

The molarity of the potassium carbonate solution is 3.29 M, rounded to three significant figures.

From the balanced chemical equation, we can see that the reaction between lead(II) nitrate and potassium carbonate has a 1:1 stoichiometry. This means that the number of moles of lead(II) nitrate and potassium carbonate that react must be equal.

First, we need to calculate the number of moles of lead(II) nitrate present in the 64.4 mL of 2.56 M solution:

moles of \(Pb(NO3)2\) = Molarity x Volume (in L)

moles of \(Pb(NO3)2\) = 2.56 M x 0.0644 L

moles of \(Pb(NO3)2\) = 0.165 M

Since the stoichiometry of the reaction is 1:1, the number of moles of potassium carbonate must also be 0.165 moles. We can use this information to calculate the molarity of the potassium carbonate solution:

moles of \(K2CO3\) = Molarity x Volume (in L)

0.165 mol = Molarity x 0.0502 L

Molarity = 0.165 mol / 0.0502 L

Molarity = 3.29 M

Therefore, the molarity of the potassium carbonate solution is 3.29 M, rounded to three significant figures.

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Answer:

Pure crystals of the substance of interest are recovered using crystalization

It can be used to obtain substances that decompose on heating.

Explanation:

Crystalization is the process of converting a liquid solution to a crystalline solid. It is a common method of extracting the solid product of a reaction from solution. It can also be a separation method especially for obtaining pure crystals from a solution.

Crystalization does not require heating. Common methods of inducing crystalization include; addition of crystals of the same substance as seeds or scratching the vessel containing the solution.

The advantage of crystalization over evaporation is that it can be used to recover substance that decompose on heating. Also crystalization yields pure crystals of the substance of interest compared to evaporation in which soluble impurities may not be completely removed.

Phases present under these conditions are: a) At t = -70 OC and p = 1.0 atm, the phase is solid phase (Ice). b) At t = -40 OC and p = 15.5 atm, the phase is gas phase (steam). c) At t = -80 OC and p = 4.7 atm, the phase present is solid phase (Ice).

Under standard conditions, water exists in its liquid phase at a temperature of 25 °C and a pressure of 1 atm. When the temperature and pressure conditions are modified, the phase of water may change.

The freezing point of water is 0 degrees Celsius, whereas the boiling point is 100 degrees Celsius. Water may exist as a solid (ice), liquid (water), or gas (steam) depending on temperature and pressure.

The state of water, such as gas, liquid, or solid, is determined by temperature and pressure. Water can exist in three states at a given temperature and pressure: liquid, solid, and gas.

The conditions of temperature and pressure at which water shifts from one state to another are known as phase transitions or changes.

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Answer:

V₂ = 0.4 L

Explanation:

Data:

Wanted:

Equation:

Solution:

Answer: I think you're supposed to add the protons and neutrons and then that's your answer. Sorry if I'm wrong :/

Explanation:

If the concentration of fluoride anion and aluminum cation was increased to 5M, then there would be decrease in Ecell by 0.055 volts

The standard reduction potential of Fluoride anion and aluminum cation are -

2Al -----> 2Al3+ + 6e-           \(E^o\)cell = +1.66

6e- + 3F2 -----> 6F-               \(E^o\)cell = +2.87

The complete reaction is -

2Al + 3F2 ------> 2Al3+  +  6F-    \(E^o\) = +4.53

Using Nernst Equation :-

E = \(E^o\) – 0.0592/n*log[Al3+]^2[F-]^6

n = 6 (n = number of transferred electrons)

E = +4.53 - 0.0592/6*log(5)^2(5)^6

E = +4.53 - 0.00987*log(25)(1.56 x 10^4)

E = +4.53 – 0.00987*log(3.9 x 10^5)

E = + 4.53 -0.00987(5.59)

E = + 4.53 - 0.055

E = +4.47

The change in Ecell = 5 - 4.47 = 0.055V

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Answer:

3 seconds

Have a good day!

Answer:

3secs

Explanation:

speed = distance/time

d= 300m

s=100m/s

100= 300/t

100t=300

divide both side by 100

t= 300/100

t=3sec

Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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Atomic mass unit is also known as unified mass. This is represented by a small alphabetic letter, One atomic mass unit is defined as exactly one-twelfth the mass of an atom of carbon-12. Its symbol is ‘u’.

To find the symbol of atomic mass unit , we need to know what is this atomic mass unit mean by: The mass of an atom is called atomic mass. It is measured in terms of atomic mass unit (amu).

Atomic mass unit (amu) is the one -twelfth mass of Carbon - 12 isotopes. It is also known as unified atomic mass (u).

We can convert atomic mass unit (u) can be converted into gram by the following equation:

1u=1.66×10−24g

For example, the mass of one atom of Carbon is 12 u.

Mass of one atom of Oxygen is 16 u

Mass of one atom of Chlorine is 35.5 u.

Therefore, ‘u’ symbol represents the unit of atomic mass, amu.

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The statement about members of a homologous series that is true is that they differ from their nearest neighbors by 14 amu (c).

A homologous series is a group of compounds with a similar general formula, chemical properties, and a constant increment in molecular structure. As a result, each member varies from the previous by a constant unit, which is often a CH2 group.Each member of the homologous series is classified as either a tautomer or a constitutional isomer. Constitutional isomers, also known as structural isomers, are compounds with the same molecular formula but different structural arrangements. Isomers of tautomers are structural isomers that interconvert by a simple chemical reaction. As a result, the formula and composition of tautomers are the same, but they differ in the distribution of their valence electrons and bonding patterns.Members of a homologous series may or may not be hydrocarbons, and they are not always constitutional isomers. Therefore, statement (a) and statement (b) are both incorrect. Statement (d) is also incorrect because tautomers cannot be classified as members of a homologous series. However, statement (c) is correct because members of a homologous series differ from their nearest neighbors by a constant increment in molecular structure, which is usually 14 amu. Therefore, the correct answer is C.

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Answer:

10.81 amu

Explanation:

The average atomic mass of Boron can be calculated as follows :

\(A=19.9\%\ \text{of}\ 10.01294 +80.1\%\ \text{of}\ 11.00931\\\\A=\dfrac{19.9}{100}\times 10.01294 +\dfrac{80.1}{100}\times 11.00931\\\\A=10.81\ \text{amu}\)

So, the average atomic mass of boron is 10.81 amu.

The mass of carbon that resulted from the decomposition of 37 L of carbon dioxide is 19.8 g

CO₂ —> C + O₂

From the balanced equation above,

1 L of CO₂ decomposed to produce 1 L of C.

Therefore,

37 L of CO₂ will also decompose to produce 37 L of C

At standard temperature and pressure (STP),

22.4 L = 1 mole of C

Therefore,

37 L = 37 / 22.4

37 L = 1.65 mole of C

Thus, the mass of Carbon can be obtained as follow:

Mass = mole × molar mass

Mass of C = 1.65 × 12

Mass of C = 19.8 g

Thus, 19.8 g of carbon were obtained from the reaction.

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The 1H NMR spectrum of this compound −60°C shows a peak at 7.6 ppm, this would indicate aromaticity - True.

Nuclear magnetic resonance is used in proton nuclear magnetic resonance (proton NMR, hydrogen-1 NMR, or 1H NMR), which uses hydrogen-1 nuclei inside a substance's molecules to determine the structure of those molecules. Almost all of the hydrogen in samples containing natural hydrogen (H) is the isotope 1H (hydrogen-1; that is, hydrogen with a proton for a nucleus).

Solvent protons must not be permitted to obstruct the recording of simple NMR spectra since they are done in solutions. Deuterated solvents, such as deuterated water, D2O, deuterated acetone, (CD3)2CO, deuterated methanol, CD3OD, deuterated dimethyl sulfoxide, (CD3)2SO, and deuterated chloroform, CDCl3, are favoured for use in NMR. Deuterium, or 2H, is typically represented by the letter D. However, a non-hydrogen solvent, such as carbon tetrachloride (CCl4) or carbon disulfide, CS2, may also be used.

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Answer:

A is √34

Explanation:

We can solve for the hypotenuse "A" using the Pythagorean theorem.  

a²+b²=c²

3²+5²=c²

9+25=c²

34=c²

√c=√34

c=√34 --> A