92. Round the answer for each problem to the correct
number of significant figures.
a. (7.31 × 104) + (3.23 × 10³)
b. (8.54 x 10-3) - (3.41 x 10-4)
c. 4.35 dm x 2.34 dm x 7.35 dm
d. 4.78 cm + 3.218 cm + 5.82 cm
e. 38,736 km + 4784 km

Answer:

It is more active

Explanation:

This atom attracts all the elecrons of the atom forming energy levels in form of orbits

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Density = 0.8104 g/ml

⇒ mass/volume = 0.8104 g in 1ml volume.

Number of moles = Mass (g) / Molar mass (g/mol)

⇒ No. of moles =0.8104/88.148 = 9.1936 x 10^-3 mole in 1 ml volume

So, in 2.66 ml of isopentyl alcohol,

No. of moles = 2.66 x 9.1936 x 10^-3 = 24.454976 x 10^-3 mole

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Answer:

A and D is what I got hopes this helps

95.6g I2 is produced by 2*150*95.6/254 g NaI = 112.91g of NaI.(sodium iodide)

What is sodium iodide?

A metal iodide salt with a Na (+) counterion is sodium iodide. It is an iodide salt and an inorganic sodium salt. A water-soluble ionic compound having a crystal lattice is sodium iodide. Although it can be used as a supplement for complete parenteral nutrition, sodium iodide is more frequently applied in veterinary medicine.

2*150 grams of Sodium Iodide NaI must be used to produce 254 g of Iodine I₂

For the formation of Iodine from NaI , the reaction is the follows:

2NaI(aq) + Cl₂ → I₂ + 2 NaCl

To calculate how many grams of NaI are needed to produce 95.6 g of Iodine, we use a conversion factor to go backward from grams of iodine to grams of sodium iodide.

Thus, 254g I2 is produced by 2*150 g NaI

95.6g I2 is produced by 2*150*95.6/254 g NaI = 112.91g of NaI.

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Answer:

3:2:6

There's 3 Beryllium atoms, 2 Aluminum atoms, and 6 Trioxidosilicate atoms.

The ratio of atoms of each element in beryllium aluminium silicate, the ratio of Be: Al: Si:o : 3:2:6:18.

The building block of an element is an atom. An atom is a kind of stuff that cannot be further decomposed chemically. The three main components of an atom are protons, neutrons, plus electrons.

Some substances are either bigger or smaller than atoms. Examples of chemical species which are not commonly regarded as atoms include protons, neutrons, and electrons, which are atom-related particles.

Atoms make up molecules and compounds, however they are not actual atoms. The molecules and compounds salt, water, and methanol are examples of. Ions are the name for electrically charged atoms.  The ratio of atoms of each element in beryllium aluminium silicate, the ratio of Be: Al: Si:o : 3:2:6:18.

Therefore,  the ratio of Be: Al: Si:o : 3:2:6:18.

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The % by mass of KCl in the original mixture is 40%

Given:

Mass of AgCl, m = 5.52g

Molar mass of AgCl, mm = 143.32g/mol

Mass of sample mixture, ms = 2.42g

Molar mass of KCl = 74.5513g/mol

To find:

Mass of KCl = ?

Formula:

Mass of KCl = no. of moles x molar mass

% = Mass of KCl / Mass of sample mixture x 100

Calculations:

n AgCl = 5.52 / 143.32 = 0.039 mols

Since Moles of AgCl = 1 mole from 1 mole of KCL and 2 moles from 1 mole of MgNO3

1 mole of KCl forms 1/3 mole of AgCl

Therefore,

No. of moles of AgCl formed from KCl = 1/3 x 0.039 = 0.013 mols

Mass of KCl = 0.013 x 74.5513 = 0.969g

% = 0.969 / 2.42 x 100 = 40%

Result:

The % by mass of KCl in the original mixture is 40%.

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The process for calculating the molarity of a solution:

1) Calculate the number of moles of solute by multiplying mass of solute and the inverse of molar mass.

2) Calculate the molarity of the solution by multiplying number of moles of solute and the inverse of solution volume.

n(NaNO₂) = m(NaNO₂) × 1/M(NaNO₂); multiplying mass of solute and the inverse of molar mass.

n(NaNO₂) = 4.8 g ÷ 69 g/mol

n(NaNO₂) = 0.0695 mol; the number of moles of solute

c(NaNO₂) = n(NaNO₂) × 1/V(NaNO₂);

c(NaNO₂) = 0.0695 mol ÷ 0.150 l

c(NaNO₂) = 0.463 mol/l; the molarity of the solution

Missing options:

1) Calculate the number of moles of solute by multiplying number moles of solute/mass of solute and molar mass/the inverse of molar mass.

2) Calculate the molarity of the solution by multiplying molarity of solute/number of moles of solute and solution volume/the inverse of solution volume.

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I think it should be C. Cu and Ag since they are both in the same group of the periodic table, meaning that they have similar properties.

Answer:

3.63 g/mL (3 s.f.)

Explanation:

Density is the amount of substance per unit volume, and can be calculated by dividing the mass by the volume.

Given: mass= 59.6 g, volume= 16.4 mL

Density of block

= 59.6 ÷16.4

= 3.63 g/mL (3 s.f.)

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Answer:

The density calculator will help you estimate the relationship between the weight and volume of an object.

Explanation:

During winter in new york, the lower the temperature drops, the higher the demand for energy. this is an example of a negative relationship.

An inverse correlation that favors one partner at the expense of the other is referred to as a negative relationship. This may resemble codependency or other dysfunctional dynamics in which the needs of one spouse are not satisfied or even taken into account. Loss of trust, poor communication, lack of respect, a difference in priorities, and a lack of intimacy are the primary causes of negative relationships.

People who are in negative relationships are more likely to show signs of diminished confidence and self-worth. Additionally, it causes more self-doubt, helplessness, fear, worry, melancholy, insecurity, and paranoia, which lowers professional motivation and productivity.

Lower rates of anxiety and despair, more self-esteem, more empathy, and closer relationships are all examples of correlations that have been demonstrated in negative relationships. Your immune system can be boosted by having healthy connections, and they can also aid in your recovery from illness.

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Tertiary structure is achieved when a protein folds into a compact, three-dimensional shape stabilized by interactions between side-chain r groups of amino acids.

What is the structure of proteins?

A secondary amine (in proline), a molecule with the amino group (NH 2) attached to the alkyl side chain, and an amino acid with five carbon atoms (glutamic acid), are also found in proteins. Aspartic and glutamic acids both have two carboxyl groups (COOH), making them dicarboxylic acids.

When a protein folds into a small, three-dimensional shape that is stabilised by interactions between side-chain r groups of amino acids, this is known as tertiary structure.

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The complete combustion reaction of the naphthalene is that Naphthalene+ oxygen → carbondioxide + water + energy

The complete combustion reaction of the naphthalene is given below;

Naphthalene+ oxygen → carbondioxide + water + energy

This reaction takes place and the reason behind this is that the naphthalene combustion involves a simple burning reaction in which the simple burning procedures are present.

Naphthalene also with oxygen will burn and in the result of which carbon dioxide and water will produce.

So we can conclude that the complete combustion reaction of the naphthalene is that Naphthalene+ oxygen → carbondioxide + water + energy.

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The true statement about mixtures is that they do not have specific compositions (option B).

Mixture is a substance made up of two or more chemical components that are not chemically linked.

This further means that the constituents of a mixture maintain or keep their individual chemical identities because there is no breaking of bonds.

As opposed to mixtures, compounds are made up of constituents that are chemically bonded to one another, hence, possess a definite composition.

Examples of mixtures are as follows:

Therefore, the true statement about mixtures is that they do not have specific compositions.

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An acidic solution has a ph value of 0 - 6, a neutral solution has a ph value of 7, and a basic (alkaline) solution has a ph value of 8 - 14.

According to Arrhenius, an acid is a substance that releases hydroxonium ion (H3O+) as its only positive ion when dissolved in water. In other words, they are proton donors. They also turn litmus paper red, have a wet feeling and a sour taste.

A base is a substance that releases hydroxide ion (OH-) as its only negative ion when dissolved in water, according to Arrhenius. They are proton acceptors and turn litmus paper blue. They have a slippery feeling and a bitter taste.

To determine whether a solution is acidic or basic, ph indicators like litmus paper, phenolphthalein and methyl orange are used, but they do not give an exact ph value. To specifically know how acidic or basic a solution is, the ph scale is used. It comprises of a range of numbers from 0 - 14, with 0 being the most acidic and 14 being the most basic. Neutral substances like water have ph value of 7. Acidic solutions have a ph range from 0 - 6, while basic solutions have ph values from 8 - 14.

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Answer:

Oxygen and Carbon dioxide

240L of 90% solution is used to make solution.

Let, the quantity of 75% antifreeze solution be x and 90% antifreeze solution be y.

360 is the total quantity of the mixture

x + y = 360                                        (1)

Also the final solution is 85% solution

75 % of x + 90% of y = 85% of 360

0.75x + 0.90y = 0.85 × 360

0.75x + 0.90y = 306

75x + 90y = 30600                            (2)

by solving equation 1 and 2 we get

15y = 3600

   y = 240

Therefore, 240L of 90% solution is used to make solution.

Any material that lowers water's freezing point is an antifreeze, and it works to prevent ice from forming and shield systems from its negative consequences. Radiators in car cooling systems are protected by antifreezes, including ethylene glycol or propylene glycol, which are frequently added to water.

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Answer:

240L of 90% solution is used to make solution.

Let, the quantity of 75% antifreeze solution be x and

90% antifreeze solution be y.

360 is the total quantity of the mixture

x + y = 360

(1)

Also the final solution is 85% solution

75% of x + 90% of y = 85% of 360

0.75x + 0.90y = 0.85 × 360

0.75x + 0.90y=306

75x + 90y = 30600

(2)

by solving equation 1 and 2 we get

15y = 3600

y=240

Therefore, 240L of 90% solution is used to make

solution.

antifreeze, and it works to prevent ice from forming

Any material that lowers water's freezing point is an and shield systems from its negative consequences. Radiators in car cooling systems are protected by antifreezes, including ethylene glycol or propylene glycol, which are frequently added to water.

The relative molecular mass of sodium trioxonitrate, NaNO₃ is 85 g/mol.

The molecular mass of a substance is the sum of all atomic masses of all atoms in a molecule. It is measured in Dalton.

The compound is NaNO₃ and the atomic mass of all atoms are given below:

Atomic Mass of sodium (Na) = 23 g

Atomic Mass of nitrogen (N) = 14 g

Atomic Mass of oxygen (O) = 16 g

Now add the atomic masses of atoms of the molecules:

Molecular mass of = 23 +14 +16(3) = 85 g/mol.

Thus, the relative molecular mass of sodium trioxonitrate is 85 g/mol.

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Molarity of isopropanol in the solution is found to be 0.0196M

The concentration of the solute in a solution is its molarity. It also goes by the name "molar concentration." The moles of solute per litre of solution is measured as molarity. The letter M serves as its symbol.

The amount of moles of solute in a kilogram of solvent is known as molality. The letter m stands for it.

Given:

Molecular mass of isopropanol, mm = 60.10g/mol

Molality, m = 10.01m

Density, d = 1.180g/ml

To find:

Molarity, M = ?

Formula:

M = (m x d) / 1 + (m x mm)

Calculations:

M = (10.01 x 1.180) / 1 + (10.01 x 60.10)

M = 11.8118 / 602.601

M = 0.0196M

Result:

The molarity of isopropanol in the aqueous solution is found to be 0.0196M.

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25% weight-to-weight acetic acid solution has a molar fraction of 4.375 M.

What is molar fraction?

The mole fraction is one of many ways to indicate the concentration of the solution. A mole fraction is a unit of concentration. The ratio of solute to solvent in a solution is measured using a unit called the mole fraction, which is symbolised by the letter "X."

X is a molar fraction representation. The mole fraction is defined as: moles of solute/total moles of solvent if the solution contains only components A and B. As a result, the mole fraction of each component added together is always equal to one.

The fact that the acetic acid is specified as 25% should be noted.

1.05 kg/L or 1.05 g/ml of solution density is equal to d.

Given the density, the molar fraction of a 25% weight-averaged acetic acid solution will be:

M = 25 × 1.05 × 10/60

= 4.375 M

Therefore, 4.375 M is the molar fraction of a 25% weight-to-weight acetic acid solution.

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The molar fraction of 25% w/w acetic acid solution is 4.375 M.

The mole fraction, commonly known as the molar fraction (xi or I is a unit of measure for the amount of a constituent (represented in moles), ni, divided by the sum of all constituent amounts in the mixture (also stated in moles, ntot).

The Mole Fraction is the product of the molecular weight of one component divided by the molecular weight of the entire combination. When two components with reactive natures are combined, it is quite helpful.

The unit of molar fraction is  Moles/liter.

Density of solution = 1.05 kg/L

                                 = 1.05 g/ml

The molar fraction is

M = 25 × 1.05 × 10/60

    = 4.375 M

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Lithium has 3 protons in the nucleus.

Atomic number =number of protons =number of electrons

According to the question,

we have been given atomic number= 3

So, number of protons will be 3 and number of electrons will also be 3.

We can additionally calculate number of neutrons as follows-

number of neutrons= mass number - number of protons

                                   = 6.941 - 3

                                   ≈ 4

Hence, the number of protons in lithium will be 3.

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The nucleus of Lithium has three protons.

The number of protons or electrons in the nucleus of a neutral atom is known as its Atomic number.

The total mass of an atom's protons and neutrons is known as its mass number. (neutrons and protons added together Equals nucleons)

Atomic mass= Mass number + Neutrons

Atomic number equals the sum of the protons and electrons

Since, atomic number given is 3

Therefore, protons in the nucleus will be 3.

Additionally, we may determine the neutron number using the formula below.

mass number = number of neutrons + number of protons

⇒ 6.941 = number of neutrons + 3

⇒ number of neutrons will be approximately 4.

Thus, lithium will contain three protons.

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7g/mL

Density is a measure of mass per volume.

Density Formula

The density formula is  [tex]\displaystyle D=\frac{m}{V}[/tex] where m is the mass in grams (g) and V is the volume in milliliters (mL). The way I learned the formula was that the m over the V looks like a heart when written out.

We can plug the mass and volume we were given to solve for density.

[tex]\frac{14}{2}[/tex] equals 7. So, the density must be 7 grams per milliliter (g/mL).

Density Units

The units for density are important. You will not get the correct answer if you do not include your units. There are multiple ways to express density, but it is most common to have g/mL.

Additionally, density should always have the volume measurement in the denominator. This means that density will never be written in mL/g.

The mass percentage of Cl⁻ in the solution produced when 3.00g of CaCl₂ is dissolved in 100.0mL of water is 1.86 %.

The total mass of the solution which is produced when 3.00g of CaCl₂ is dissolved in 100.0mL of water is determined as follows:

mass of CaCl₂ = 3.0 g

mass of water = density * volume

mass of water = 1.00 g/mL * 100.0 mL

mass of water = 100.0 g

mass of solution = (100.0 + 3.0) g

total mass of solution = 103.0 g

molar mass of CaCl₂ = (40 + 35.5 * 2) g/mol

molar mass of CaCl₂ = 111 g/mol

mass percentage of Cl⁻ in CaCl₂ = 71/111

mass of Cl⁻ present in 3.0 g of CaCl₂ = 71/111 * 3 = 1.92 g

mass percentage of Cl⁻ in the solution = 1.92/103 * 100%

mass percentage of Cl⁻ in the solution = 1.86 %

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Moles = mass / molar mass

molar mass of retinol is 286.459 g/mol.

moles = 0.125/ 286.459

moles = 0.00043

A chemical compound's molar mass is calculated by dividing its mass by the amount of the compound present in the sample, which is given as the number of moles in the sample and measured in moles. A substance's molar mass is a bulk characteristic rather than a molecular one. The molar mass of the substance is an average over many samples, which frequently have varying values due to isotopes. The molar mass is most usually estimated using the standard atomic weights and is a function of the relative abundance of the isotopes of the constituent elements on Earth.

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Answer: 4.36x10^-4 mol

Explanation:

Inside of complex 1, fmnh2 transfers electrons to an fe/s complex. when this reaction occurs, FMNH, gets oxidized. So, the correct option is (c).

Either complex I or II is where electrons can enter the electron transport chain. The NADH, which is created in three processes of the citric acid cycle, is where these electrons originate from. As an illustration, consider the reaction in step 8 where NAD+ is reduced to NADH and L-malate is oxidized to oxaloacetate. Two hydrogen (H+) ions and two electrons are taken away from the substrate in the oxidation half-reaction.

The NAD+ molecule takes both of those electrons as well as one of the H+ ions during the reduction half-reaction. The inner mitochondrial membrane, the intermembrane space, and the other H+ ion are all traversed by the other H+ ion from the matrix. Through the matrix, NADH diffuses before being bound by complex I of the electron transport chain.

Complex I of the electron transport chain binds NADH as it diffuses across the matrix. The coenzyme flavin mononucleotide (FMN) in the complex takes both of NADH's electrons. By transferring the electrons, FMN is reduced to FMNH2 (reduced form of flavin) and NADH is oxidized back to NAD+.

Several proteins in Complex I have iron-sulfur (FeS) centers. These proteins are now receiving the electrons that were used to convert FMN to FMNH2.Two Fe-S centers are required to accept the two electrons required to regenerate FMN mononucleotide since each Fe-S center can only transmit one electron.

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Answer:

False

Explanation:

Substances are of two types: Pure substances and mixtures. Pure substances include elements (made up of single kind of atoms), compounds (atoms of different element in fixed proportion). Substances are of three types: elements, compounds and mixtures.

Answer: C)

Explanation:

cyclononane

For the reaction c2h6(g)=c2h4(g) h2(g) deltah= 137kj/mol and deltas= 120j/k. this reaction is spontaneous.

A spontaneous reaction is one that favours the creation of products under the reaction's current conditions.

A bonfire that is raging and exothermic is an illustration of a spontaneous reaction (there is a decrease in the energy of the system as energy is released to the surroundings as heat).

Exothermic reaction: This is a reaction when there is a decrease in the enthalpy.

At high temperatures, the reaction is spontaneous when both H and S are positive.

Let's take that back;

ΔG = ΔH - TΔS

Therefore, the reaction is spontaneous at high temperature when both H and S are positive.

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Answer:video camera

Explanation: