Which of the following statements is true about the sense of smell? Men and women smell the same number of odors. The amount of odors one can smell is unknown. Women tend to smell more odors than men. People can smell approximately 100 odors.

Answer:

B

Explanation:

The period of a wave is directly proportional to the wavelength of the wave. True

Period is the time it takes to complete one cycle of a wave, and wavelength is the distance between two identical locations in the neighbouring cycles of a wave. The number of cycles in a second is defined as frequency. In other terms, frequency = 1 / period.

An electromagnetic wave's wavelength is proportional to its frequency. Likewise, an electromagnetic wave's frequency is equal to the reciprocal of its period.

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Answer:

To make 500 ml, you need 5x this amount. 5 x 4.33 g = 17.21 g glucose in a final volume of 500 ml

Explanation:

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There are 0.84 moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3.

To determine the number of moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3, we need to consider the stoichiometry of the compound.

The formula of aluminum sulfate (Al2(SO4)3) indicates that for every 1 mole of the compound, there are 2 moles of aluminum ions (Al3+). This means that the mole ratio of Al3+ to Al2(SO4)3 is 2:1.

Given that we have 0.42 mol of Al2(SO4)3, we can calculate the moles of Al3+ as follows:

Moles of Al3+ = 0.42 mol Al2(SO4)3 x (2 mol Al3+ / 1 mol Al2(SO4)3)

Moles of Al3+ = 0.42 mol Al2(SO4)3 x 2

Moles of Al3+ = 0.84 mol Al3+

Therefore, there are 0.84 moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3.

It's important to note that the stoichiometry of the compound determines the mole ratio between the different species involved in the chemical formula. In this case, the 2:1 ratio of Al3+ to Al2(SO4)3 allows us to determine the number of moles of Al3+ based on the given amount of Al2(SO4)3.

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The mass (in grams) of chlorine gas is needed to react with 251 grams of iron is 479 grams. Option C.

To determine the mass of chlorine gas needed to react with 251 grams of iron, we need to use the stoichiometry of the balanced chemical equation:

2Fe + 3Cl2 → 2FeCl3

From the balanced equation, we can see that 2 moles of iron (Fe) react with 3 moles of chlorine gas (Cl2) to produce 2 moles of iron(III) chloride (FeCl3).

To calculate the mass of chlorine gas, we can follow these steps:

Step 1: Convert the given mass of iron (Fe) to moles.

Using the molar mass of iron (Fe), which is approximately 55.85 g/mol, we can calculate the number of moles of iron:

moles of Fe = mass of Fe / molar mass of Fe

moles of Fe = 251 g / 55.85 g/mol

moles of Fe ≈ 4.5 mol (rounded to one decimal place)

Step 2: Use the mole ratio from the balanced equation to find the moles of chlorine gas (Cl2) needed.

From the balanced equation, we know that 2 moles of Fe react with 3 moles of Cl2. Therefore, the moles of Cl2 can be calculated as:

moles of Cl2 = (moles of Fe / 2) * 3

moles of Cl2 = (4.5 mol / 2) * 3

moles of Cl2 ≈ 6.75 mol (rounded to two decimal places)

Step 3: Convert the moles of chlorine gas to grams.

Using the molar mass of chlorine gas (Cl2), which is approximately 70.90 g/mol, we can calculate the mass of chlorine gas:

mass of Cl2 = moles of Cl2 * molar mass of Cl2

mass of Cl2 = 6.75 mol * 70.90 g/mol

mass of Cl2 ≈ 479 grams (rounded to the nearest whole number) Option C is correct.

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Answer:

TRUE

Explanation:

Production of Hydrocarbons from Natural Gas is as stated below:

Natural gas liquids include propane, butane, pentane, hexane, and heptane, but not methane and not always ethane, (may include it sometimes.) since these hydrocarbons need refrigeration to be liquefied.

Explanation:

Element X naturally forms ions with a charge of +1.

Group 1A (alkali metals) forms ions with a +1 charge.

For example, Na

Na tends to lose its outermost electrons and forms Na+1.

Elements in the same group will behave similarly and will form similar compounds

------

We can have NaCl => Na+1 + Cl-1

These elements from group 1 can not gain electrons, they lose their electrons.

If X has a charge of +1, this was because it lost its outermost electron.

Answer: Elements X tends to gain one electron

Protons, which are positively charged, and neutrons, which have no electric charge, make up the very dense core nucleus of an atom.

"An atomic nucleus contains protons, which have positive charges," In reality, the protons and neutrons that make up an atomic nucleus are called nucleons. The charge of an atomic nucleus is mostly determined by the positive charge of the protons because neutrons are neutral or have no charge.

The smallest, indivisible unit that makes up the substance that gives rise to all chemical elements is referred to as an atom. As a result, atoms are frequently thought of as the basic units of matter, the structure of which defines the nature of a chemical element.

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Explanation:

For Mg, (1.2 g Mg/24 g Mg) = 0.05 mol Mg.

For Cl, (3.55 g Cl/35.5 g Cl) = 0.1 mol Cl

So the ratio now is

Mg:Cl = 0.05 : 0.1 = 1:2

I got the 1:2 ratio by dividing both by the smallest number, which is 0.05 mol. Therefore, the empirical for formula of the substance is \(MgCl_2\)

The empirical formula of the compound formed when magnesium reacts with chlorine is MgCl₂.

To determine the empirical formula of the compound formed when magnesium (Mg) reacts with chlorine (Cl), we need to find the ratio of the elements in terms of moles.

First, we calculate the number of moles of each element:

Moles of Mg = Mass of Mg / Molar mass of Mg

Moles of Mg = 1.2 g / 24 g/mol

Moles of Mg = 0.05 mol

Moles of Cl = Mass of Cl / Molar mass of Cl

Moles of Cl = 3.55 g / 35.5 g/mol

Moles of Cl = 0.1 mol

Next, we determine the simplest whole-number ratio between the moles of Mg and Cl:

Mg:Cl = 0.05 mol : 0.1 mol

To simplify the ratio, we divide both values by the smaller value (0.05 mol in this case):

Mg:Cl = 0.05 mol / 0.05 mol : 0.1 mol / 0.05 mol

Mg:Cl = 1 : 2

Therefore, the empirical formula of the compound formed when magnesium reacts with chlorine is MgCl₂.

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5.972 × 10^24 kg

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Answer:

5.972 × 10^24 kg

hope this helps

Answer:

The answer is "\(\bold{\log \frac{[0] mole}{[R]mole}}\)"

Explanation:

\(E_{cell} =E_{cell}^{\circ} - \frac{0.0591}{n}= \log\frac{[0]}{[R]}\\\)

In the above-given equation, we can see from \(E_{ceu}\), of both oxidant \(conc^n\)as well as the reactant were connected. however, weight decreases oxidant and reduction component concentration only with volume and the both of the half cells by the very same factor  and each other suspend

\(\to \log \frac{\frac{\text{oxidating moles}}{25 \ ml}}{\frac{\text{moles of reduction}}{25 ml}} \ \ = \ \ \log \frac{\frac{\text{oxidating moles}}{30 \ ml}}{\frac{\text{moles of reduction}}{30 ml}} \\\\\\\)

\(\to {\log \frac{[0] mole}{[R]mole}}\)

The cell potential of the electrochemical reaction has been the same when the volume has been reduced from 30 mL to 25 mL in each half cells.

The cell potential has been given as the difference in the potential of the two half cells in the electrochemical reaction.

The two cells has been set with the concentration of solutions in the oxidation and reduction half cells.

The cell potential has been changed when there has been a change in the potential of the half cells.

The volume of 30 mL to the solution has been, resulting in the cell potential difference of x.

With the volume of 25 mL, there has been the difference in the potential being similar to the 30 mL solution, i.e. x.

Thus, the cell potential of the electrochemical reaction has been the same when the volume has been reduced from 30 mL to 25 mL in each half cells.

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Answer:

\(S^0 \rightarrow S^{+4}+4e^-\)

Explanation:

Hello,

In this case, for the reaction:

\(K_2Cr_2O_7 + H_2O + S \rightarrow SO_2 + KOH + Cr_2O_3\)

We first must assign the oxidation state of each element:

\(K^{+1}_2Cr^{+6}_2O_7^{+2} + H_2^{+1}O^{-2} + S^0 \rightarrow S^{+4}O_2^{-2} + K^{+1}O^{-2}H^{+1} + Cr_2^{+3}O_3^{-2}\)

Thus, we should remember that the oxidation half-reaction applies for the element undergoing an increase in its oxidation state, such case is sulfur, for which passes from 0 to +4 as shown below:

\(S^0 \rightarrow S^{+4}+4e^-\)

It means, that four electrons were lost due to the effect of the strong oxidizing agent, potassium dichromate.

Best regards.

Answer:

6. valence, 7. full outer shell, 8.8, 9.lose/gain, 10. share, 11. ionic, 12. covalent, 13. ions, 14, negative

Explanation:

Answer:

6)Valence

7)stability

8)2

9)transfer of

10)share

11)covalent

12)ionic

13)ion

14)negative

Answer:

16.85 K

Explanation:

-256.3°C + 273.15 = 16.85K

Of the two enzymes studied, when plotting concentration versus reaction rate, enzyme A produces a hyperbolic plot and enzyme B produces a linear plot.

The reaction rate of enzyme A increases uniformly, reaches a saturation point, and the reaction rate of enzyme B decreases uniformly over the same set of conditions.

Given this data, enzyme A obeys the Michaelis-Menten equation. Analyzing the shape of this plot, the estimated value of Vmax is 112 mmol/s and KM is 8 × 10-³ mmol/L. For enzyme B, there is no defined saturation point and the reaction rate decreases uniformly.

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Answer:

the entropy of the universe increases

Explanation:

The second law of thermodynamics can be stated in terms of entropy, in this statement of the law; ''a spontaneous process increases the entropy of the universe''.

Given that; ∆Suniverse = ∆Ssystem + ∆Ssurroundings, the definition of a spontaneous process is one in which ∆Suniverse >0.

Hence, a process is spontaneous when the entropy of the universe increases.

Answer:

Since the mass is given in mg and the density in g/cm3, the first step is to convert one into compatible units. Let's convert the mass in mg into grams by dividing by 1000 (there is 1000 mg in 1 gram). So the mass is 0.035 g.

Since density = mass/volume, then volume = mass/density

So Volume = 0.035g/0.788 g/cm3 = 0.0444 cm3

Answer:

A) cell membrane

B) cell wall

C) mitochondria

D) vacuole

E) chloroplasts

Cell 1 is the plant cell. Cell 2 is the animal cell.

Explanation:

The van't Hoff factor for C5H4 is 1.

The van't Hoff factor, denoted as i, represents the number of particles that a solute dissociates into when it dissolves in a solvent. In the case of C5H4, which is a neutral compound, it does not dissociate or ionize when it dissolves in a solvent.

Therefore, the van't Hoff factor for C5H4 is 1, indicating that it remains as a single particle in the solvent.

When a solute dissolves in a solvent, it can sometimes dissociate into multiple particles, such as ions or molecules.

This leads to an increase in the total number of particles in the solution, affecting various properties like colligative properties (e.g., boiling point elevation, freezing point depression).

However, C5H4 does not exhibit this behavior and does not break apart into ions or molecules upon dissolution. Hence, the van't Hoff factor for C5H4 is 1, implying that it does not affect the colligative properties of the solution since it remains as a single particle.

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Eukaryotic and prokaryotic cells are similar in having ribosomes, cell membrane, and DNA, and have the same system of DNA replication.

Prokaryotic cells are primitive cells with no nucleus or membrane-bound organelles. The cells usually have cell walls whose content can vary depending on the organism. Their genetic materials lie freely within the cytoplasm.

Eukaryotic cells, on the other hand, are plant and animal cells with nuclei and membrane-bound organelles such as mitochondrion and chloroplast. Plant cells have cell walls while animal cells do not. The genetic materials of eukaryotic cells lie largely in the nuclei while organelles like mitochondrion and chloroplast have also been shown to contain some DNA.

While both cells are different in a lot of ways, they also have some similarities. These include:

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Answer:

A is the answer hope this helps if wrong I ont know

Based on the mass composition of the penny:

The density of the penny  that was made of a brass alloy that is 95% copper and 5% zinc by mass is calculated as follows:

The densities of copper and zinc are 8.96 g/cm³ and 7.14 g/cm³, respectively.

Density of Penny = 95% * 8.96 + 5% * 7.14

Density of penny = 8.87 g/cm³

The volume of the penny will then be;

volume of penny = 3.09 / 8..87

volume of the penny = 0.35 cm³

The thickness of the penny will then be;

radius of the penny = 0.95 cm

thickness of the penny = v /  π r²

thickness of the penny = 0.35 / 3.142 * 0.95²

thickness of the penny = 0.12 cm

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Active transport requires energy to transport the molecules across the cell membrane. Thus, Option A is correct.

Active transport is the transport of molecules from a lower concentration to a higher concentration across the cell (plasma) membrane. As this process is against the concentration gradient, it requires cellular energy to transport the molecules or ions. Active transport involves Primary active transport and secondary active transport.

Passive transport involves the movement of molecules from a higher to lower concentration gradient and thus does not require energy and is slower than active transport.

Therefore, only active transport requires energy for the transportation of molecules across the cell membrane.

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Answer:b

Explanation:

The correct set of coefficients of the balanced chemical equation of sodium carbonate and hydrochloric acid is 1, 2, 2, 1, 1. Therefore, option (b) is correct.

The chemical equation in which the number of atoms of each element of substances is equal on either side of the chemical equation is known as a balanced chemical equation.

The law of conservation of mass must be followed by every balanced chemical equation. By obeying this law, the total mass of reactants should be equal to the total mass of the products in a balanced chemical equation.

Given the chemical equation of the reaction between sodium carbonate and hydrochloric acid,

Na₂CO₃  +  HCl  →  NaCl  +  H₂O  +  CO₂

The balanced chemical equation will be the one in which the number of Na, C, O, H, and Cl will be equal on both sides of the equation.

Na₂CO₃  +  2 HCl  →  2 NaCl  +  CO₂  +  H₂O  

Therefore, the set of coefficients for the balanced reaction is 1, 2, 2, 1, 1.

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Answer:

composition of an element

Answer:

Explanation:

ratio of  moles of N and O in molecule =

N / O = 2.17 / 4.35

1/2

empirical formula = NO₂

Answer:

Explanation:

2CO + O2------ 2CO2

We will use the balance equation to calculate the n CO2

     CO               CO2

   2 mole               2 mole

  2.84 mole              X

so nCO2 =  2.84 mole