Which of the following is a true statement about cellular respiration? (4 points) a Cellular respiration occurs only in plant cells. b Cellular respiration occurs only in animal cells. c Cellular respiration occurs in both plant and animal cells. d Cellular respiration occurs in some plant cells and some animal cells.

In the egg floating experiment, the independent variable is adding salt to the water, the dependent variable is the egg floating in the water and the control group is the beaker just with water.

The egg floating experiment is done to test the density of the egg with respect to the water. Generally, the egg sinks in the water as the egg has a higher density than water.

On the other hand, if salt is added to water to form a salt solution and if the egg is added to that solution, then the egg floats. This is because the density of the egg is lesser than the salt solution leading the egg to float.

Therefore, in this experiment, the independent variable is the amount of salt added to the water and the dependent variable is the egg floating in the water as it is dependent on the amount of salt added the water. Thus, the control group is the beaker with water.

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We obtain the mass percent of the element T as 96.5%.

We know that the mass percent actually has to do with the mass of the object that we could have in a compound expressed as a percentage. Note that we are told that most of the new elements that were discovered do exist as oxides this implies that they are binary compounds of the element that is involved and oxygen.

Now we have to look at the section of the table that have been given in the question so as to be able to obtain the the mass percent of the element as we have it. We can see as it has been written in the table that the atomic mass of the element T is found to be 362.31.

We would now have;

Molar mass of the compound = 6(362.31) + 5(16)

= 2173.86 + 80

= 2253.86

Mass percent composition of element T =  6(362.31)/2253.86 * 100/1

= 96.5%

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0.506 moles  of  aluminum are required to remove 0.253 mol of silver sulfide from a silver bowl.

3Ag2S(s) + 2Al(s) --> 6Ag(s) + Al2S3(s)

2 moles of Al required to make 1 mole  Al2S3

1 moles Al2S3= 2 moles Al

0.253 moles Al2S3 = 0.506 moles  Al

The mole idea facilitates the measurement of a material's amount. When interacting with particles at the atomic (or molecular) level, it is acknowledged that even a single gram of a pure element has a significant number of atoms. The mole theory is widely used in this context. The most often used unit of measurement is the "mole," which is a count of many particles.

The number 6.02214076*1023, also known as the Avogadro constant, is frequently denoted by the letter "NA". One of the most fundamental entities that may be represented in moles are atoms, molecules, monoatomic and polyatomic ions, as well as other particles (such as electrons).

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Answer:

Qns no.3: it is not a correct answer

Explanation:

S has 6 outermost electrons and O has 6 outermost electrons, during bonding inorder to be stable their shouldn't be any unpaired electron in a structure. so 2 double bonds will be formed.

Taking into account the definition of calorimetry, if the final temperature is 34 °C, the specific heat of the metal is 0.8381 J/gC.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

When heat added or removed from a substance causes a temperature change in it without affecting its molecular structure, it is called sensible heat.

The expression that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this case, you know:

Replacing in the expression to calculate heat exchanges:

If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.

Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:

- Qmetal = + Qwater

- Specific heat of metal × 90 g× (34 C -98.6 C)= 4.186 J/gC× 120 g× (34 C - 24.3 C)

Solving:

- Specific heat of metal × 90 g× (34 C -98.6 C)= 4,872.504 J

Specific heat of metal × 5,814 gC= 4,872.504 J

Specific heat of metal = 4,872.504 J÷ 5,814 gC

Specific heat of metal = 0.8381 J/gC

Finally, the specific heat of the metal is 0.8381 J/gC.

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The empirical formulae of the compounds which contain: 5.85 g K, 2.10 g N , 4.80 g O is KNO₂.

given that :

mass of potassium , K = 5.85 g

molar mass of potassium = 39 g/mol

mass of nitrogen , N = 2.10 g

molar mass of nitrogen = 14

mass of oxygen , O = 4.80 g

molar mass of oxygen = 16

now, we have calculate the number of mole for each atom :

number of moles of potassium , K = mass / molar mass

                                                         = 5.85 / 39

                                                         = 0.15 mol

number of moles of nitrogen , N = 2.10 / 14

                                                      = 0.15 mol

number of moles of oxygen , O = 4.80 / 16

                                                     = 0.3 mol

now, dividing by the smallest one , we get

moles of K = 0.15 / 0.15 = 1

moles of N = 0.15 / 0.15 = 1

moles of O = 0.3 / 0.15 = 2

The empirical formula = KNO₂

Thus, The empirical formula of the compounds which contain: 5.85 g K, 2.10 g N , 4.80 g O is KNO₂.

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2.5 moles of oxygen will be produced.

A stoichiometric problem can be characterized by two features: the information given in the problem and the information to be solved called the unknown. Both the given and the unknown can be reactants, both products, or one can be a reactant and the other a product. Quantities of substances can be expressed in moles. However, in laboratory situations, it is common to determine the amount of a substance by determining the mass of the substance in grams. The amount of gaseous substance can be expressed in terms of its volume. This concept focuses on the type of problem where both the given quantity and the unknown quantity are expressed in moles.

The molar ratio is a conversion factor that relates the molar amounts of any two substances in a chemical reaction. The numerical value of the conversion factor is obtained from the coefficients of the balanced chemical equation.

For the given reaction:

2H₂O₂ → 2H₂O + O₂

This reaction indicates that the mole ratio of H₂O₂ to O₂ is 2:1 i.e. for every two moles of H₂O₂ one mole of O₂ is produced.

So, for 5.0 moles of hydrogen peroxide, moles of oxygen will be half of 5.0, which is 2.5 moles.

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Answer:

B.) 10.9 g

Explanation:

To find the mass of Mg(NO₃)₂, you need to (1) convert the volume from mL to L, then (2) calculate the amount of moles (using the molarity equation), and then (3) convert moles to grams (using the molar mass). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units.

(Step 1)

1,000 mL = 1 L

 183 mL                1 L
--------------  x  -----------------  =  0.183 L
                        1,000 mL

(Step 2)

Molarity = moles / volume (L)                   <----- Molarity equation

0.400 M = moles / 0.183 L                        <----- Insert variables

0.0732 = moles                                        <----- Multiply both sides by 0.183

(Step 3)

Atomic Mass (Mg): 24.305 g/mol

Atomic Mass (N): 14.007 g/mol

Atomic Mass (O): 15.999 g/mol

Molar Mass (Mg(NO₃)₂): 24.305 g/mol + 2(14.007 g/mol) + 6(15.999 g/mol)

Molar Mass (Mg(NO₃)₂): 148.313 g/mol

 0.0732 moles Mg(NO₃)₂             148.313 g
---------------------------------------  x  ---------------------  =  10.9 g Mg(NO₃)₂
                                                         1 mole

Answer: -210.08 J

Explanation:

Use the formula q = (m)(c)(ΔT)

q = (1.25)(2.02)(102.1-185.3)

q = -210.08 J

This is exothermic! Heat is lost.

Volume of water will be needed to make a solution of 5.0 M MgO with 200 g MgO is 25 L.

given that :

molarity of MgO = 5 M

mass of MgO = 200 g

molar mass of MgO = 40 g/mol

number of moles = mass / molar mass

number of moles of MgO = 200 g / 40 g/mol

                                           = 5 mol

molarity of solution is given as :

molarity = moles of solute / volumes in L

volume = moles / molarity

volume = 5 × 5

             = 25 L

Thus, Volume of water will be needed to make a solution of 5.0 M MgO with 200 g MgO is 25 L.

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Since Seismic waves travel at different speeds according to type, the speed of seismic waves from fastest to slowest is option C: P waves, S waves, L waves.

P waves leave the earthquake first and go the furthest. Rock oscillates perpendicular to the direction of wave propagation in S or shear waves. In rock, S waves typically move at a pace of roughly 60% that of P waves, and they always come after the latter.

Therefore, if we examine a seismogram, we anticipate that the P-wave, which is the quickest wave, will arrive first, followed by the S-wave and then the Love and Rayleigh waves, which are the slowest waves.

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The equation that shows that the salt is acidic is;

C₅H₅NHI + [tex]H_{2} O[/tex] ----->  C₅H₅N + [tex]H_{3} O^+[/tex] + [tex]I^-[/tex]

We know that when we dissolve certain salts in water, the salts could form an acidic, basic or a neutral solution depending on the kind of interaction that the salt could have with the solvent.

Looking at the salt C₅H₅NHI, we can see that the salt can interact with water so as to form the acid that is called hydro iodic acid as shown by the equation; C₅H₅NHI + [tex]H_{2} O[/tex] ----->  C₅H₅N + [tex]H_{3} O^+[/tex] + [tex]I^-[/tex]

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The enthalpy of the reaction 12173 J/°C

Heat capacity or thermal capability is a bodily belonging of count number, described as the quantity of warmth to be supplied to an object to provide a unit trade in its temperature. The SI unit of heat capacity is joule in line with kelvin. heat capacity is an intensive property.

Heat capability is described as the quantity of warmth strength required to raise the temperature of a given quantity of matter through one diploma Celsius. warmth ability for a given count depends on its length or amount and as a result, it's far an extensive asset. The unit of heat capacity is joule in line with Kelvin or joule according to degree Celsius.

Calculation:-

heat = msΔT

        = 0.50 × 3290 × (25.2 - 21.5)

         = 0.50 × 3290 × 3.7

          = 6086.5 J

q = mΔHf

ΔHf = q/m

       = 12173 J/°C

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A) The work you do on the pumpkin is 31.36 J as you lift it from the ground.

B) The work is zero as you carry it from the field.

Work can be defined as the energy spent when applying a force to move an object through a certain displacement.

The work by a force to move an object through a displacement (d) can be written as:

W = Fdcosθ

Where θ is angle between force and displacement.

(a) The mass, the displacement of the pumpkin from the ground, and the angle are:

m = 3.2 kg

d = 1.4 m

θ = 0∘

Here, the force exerted during lifting the pumpkin is equal to the weight of the pumpkin:

F = mg = (3.2)(9.8) = 31.36 N

Thus, the work done when lifting the pumpkin is

W = F d cosθ = (31.36 N)(1.4m)cos(0∘) = 44 J

(b) When carrying the pumpkin, the force exerted will be upward while the displacement of the pumpkin will always be directed forward. Therefore, they are perpendicular (i.e. θ = 90∘) to each other which is the reason why the work is zero.

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The frequency of the color of red light that has a wavelength of 663nm is 4.52 × 10¹⁴Hz.

Frequency of a wave is the quotient of the number of times (n) a periodic phenomenon occurs over the time (t) in which it occurs.

Wavelength is the length of a single cycle of a wave, as measured by the distance between one peak or trough of a wave and the next.

Wavelength is often designated in physics as λ, and corresponds to the velocity of the wave divided by its frequency.

According to this question, the wavelength of a particular color of red light is 663nm. The frequency can be calculated as follows:

663 × 10-⁹ = 3 × 10⁸ ÷ f

f = 3 × 10⁸ ÷ 6.63 × 10-⁷

f = 4.52 × 10¹⁴Hz

Therefore, 4.52 × 10¹⁴Hz is the frequency of the color of the red light.

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The electrons that are being lost gained or shared by each atom are Shared electrons.

Atoms and chemical species lose and gain electrons as they react to gain stability. Therefore, metals usually donate electrons to nonmetals to form cations. The number of electrons depends on their position on the periodic table. When an atom gains an electron, its overall charge becomes negative.

When an atom loses an electron its overall charge becomes positive. When an atom gains or loses electrons, its mass does not change. The number of electrons an atom can lose and gain share during a chemical reaction is called its valence. An atom that loses an electron gains a positive charge because it has fewer negatively charged electrons to balance the positive charge of the protons in the nucleus.

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The structural formula for 2,2-dimethylbutane in the above task is (CH3)3CCH2CH3.

The correct answer choice is option b.

It follows that the structural formula for the above compound in the above task has 4 carbon atoms as the parent chain and has 2 different methyl substituents on the same carbon 2.

The image to the paper work is attached for more clearity.

The compound; 2,2-dimethylbutane ( (CH3)3CCH2CH3 ) belong to an alkane family. They have a general formula CnH2n+2.

So therefore, we can now confirm from the explanation given above that the only correct answer for the structural formula of the compound above is (CH3)3CCH2CH3

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The number of common amino acids that are formed and used by living organisms is twenty (20), and nine are essential for living.

Amino acids are the building blocks of proteins that are linked by peptide bonds to form biomolecules. Proteins may be composed of 20 different types of amino acids, which include 9 essential amino acids that the human cannot synthesize and must be consumed from the diet.

Amino acids include, for example, leucine, isoleucine, tryptophan, tyrosine, etc. All these molecules contain an amino group and also a carboxylic group that gives them the name of amino acids.

Therefore, with this data, we can see that amino acids are composed of an amine group and a carboxylic group and they are 20 of which nine (9) are essential because the human body cannot synthesize them and must be obtained from the foods.

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Yes, this replacement reaction 3Ca + Au₂S₃ → 3CaS + 2Au.

A replacement reaction occurs when elements switch places in compounds. This type of reaction involves ions.

Generally, more reactive elements replace less reactive elements. A single replacement reaction occurs when one element replaces another element in one compound.

A single replacement reaction, sometimes called a single displacement reaction, is a reaction in which one element is substituted for another element in a compound. The starting materials are always pure elements, such as a pure zinc metal or hydrogen gas, plus an aqueous compound.

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Taking into account the reaction stoichiometry, 2.778 moles of oxygen are needed to react with 100 grams of aluminum.

In first place, the balanced reaction is:

4 Al + 3 O₂  → 2 Al₂O₃

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: If by reaction stoichiometry 108 grams of Al react with 3 moles of O₂, 100 grams of Al react with how many moles of O₂?

moles of O₂= (100 grams of Al× 3 moles of O₂)÷ 108 grams of Al

moles of O₂= 2.778 moles

Finally, 2.778 moles of oxygen are needed.

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Answer: villi/villus

Explanation: The parts labeled 2 are villi, many of which are found in the small intestine.

villi/villus exchange surface in the human body which are found in the small intestine.

They are small finger-like folding in the small intestine, A network of capillaries and a big lymph vessel called the lacteal supply the villi.

These are found in the small intestine's inner walls, Villi are specialized for absorption in the small intestine as they have a thin wall, one cell thick, which enables a shorter diffusion path.

They have a large surface area so there will be more efficient absorption of fatty acids and glycerol into the blood stream. They have a rich blood supply to keep a concentration gradient.

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The mass (in grams) of oxygen gas in the sitting room of 23000 liters is 6412.16 grams

We'll begin by converting 69 °F to °C. This can be obtained as follow:

°C = 5/9(°F - 32)

°C = 5/9(69 - 32)

°C = 20.6 °C

Next, we shall determine the mole of oxygen gas in the room. This is shown below:

PV = nRT

0.21 × 23000 = n × 0.0821 × 293.6

Divide both sides by (0.0821 × 293.6)

n = (0.21 × 23000) / (0.0821 × 293.6)

n = 200.38 moles

Finally, we shall determine the mass of oxygen gas in the room

Mole = mass / molar mass

Cross multiply

Mass = Mole × molar mass

Mass of oxygen gas = 200.38 × 32

Mass of oxygen gas = 6412.16 grams

Thus, the mass of oxygen gas is 6412.16 grams

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Comparing the results for each pair of tests, we conclude that Displacement reaction is taking place.

In the displacement reaction , one atom is displaced by the the another atom according to their reactive strength . the highly reactive atom displace the low reactive atom called as displacement reaction.

The reactions are given as :

FeSO₄  +  Zn  ---->  ZnSO₄   +   Fe

Fe(NO₃)₂   +  Zn ----->   Zn(NO₃)₂   +  Fe

Here the zinc is more reactive than the iron . so, Zinc displace the iron in both the cases. Zinc displace the iron in both the cases. The reaction is called as displacement reaction.

Thus, Comparing the results for each pair of tests, we conclude that Displacement reaction is taking place.

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2Na(s)+Cl2(g) 2NaCl(s) is the balanced equation.

However, closer examination of this equation reveals that, despite having one sodium atom on each side of the arrow, the reactants contain two chlorine atoms whereas the products have just one. This equation is invalid for use in chemical calculations because it is unbalanced.

Once more, chemical reactions never result in the creation or destruction of atoms. A balanced chemical equation is this kind of chemical equation. A chemical equation that complies with the law of conservation of matter is said to be balanced.

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Answer:

After 1 month of use, the propane tank reads 81

Explanation:

The molality of 6.2g of LiBr in 52.6g water is 0.0013mol/kg

The molecular weight of LiBr is 86.845 g/mol thus substituting this value in the formula of moles,

Moles of LiBr = grams/molecular weight

Moles of LiBr = 6.20/ 86.845

Moles of LiBr = 0.071 mol

Substituting the value of moles in the formula of molality

Molality= moles/grams of solvent

Molality= 0.071/52.6

Molality= 0.0013 mol/g

Molality, or more specifically, the number of moles of solute contained in a kilogram of solvent, is a unit used to express the concentration of a solution.

The quantity of moles of solute per kilogram of solvent is known as molality, which is denoted by a tiny "m."

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The solubility of MgCO₃ in a solution that contains 0.055 M Mg²⁺ ions is 6.36 * 10⁻⁷.

The solubility of a solution is the amount of solute present in a given volume of solvent.

The solubility of MgCO₃ in a solution that contains 0.055 M Mg²⁺ ions is calculated from the dissociation equation for the reaction given below:

The solubility product constant, Ksp =  [Mg²⁺] * [CO₃²⁻]

At equilibrium, [Mg²⁺] = 0.055 + x

[CO₃²⁻] = x

Assuming x is <<< 0.055, hence 0.055 + x = 0.055

Ksp = 0.055 * x

x = Ksp / 0.055

x = 3.5 × 10⁻⁸ / 0.055

x = 6.36 * 10⁻⁷

Hence, the solubility of MgCO₃ = 6.36 * 10⁻⁷

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