an element with atomic number 88 goes through alpha decay. its atomic number is now group of answer choices 88 80 86 none of these. 84

Burning a 54.0-g sample of sodium in the air to produce sodium oxide results in a mass of sodium oxide greater than 54.0 g.This is because, during the burning process, sodium combines with oxygen from the air to form the sodium oxide compound.

Sodium (Na) is a highly reactive metal that readily reacts with oxygen (O2) in the air. When sodium is burned, it undergoes oxidation, where each sodium atom loses one electron to form a sodium ion (Na+). Simultaneously, oxygen molecules gain two electrons each to form oxide ions (O2-). The resulting reaction forms sodium oxide (Na2O) by combining two sodium ions with one oxide ion.

The mass of the sodium oxide formed will be greater than the initial mass of sodium because the reaction involves the addition of oxygen atoms from the air to the sodium atoms. This results in an increase in the total mass of the product. Therefore, the mass of the sodium oxide produced will be greater than 54.0 g, making the correct answer choice "greater than 54.0 g."

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Answer:

B

Explanation:

Answer:

BBBBBBBBB

Explanation:

Answer:

Venus and Mars?

Explanation:

Answer:

Lichens can be used as air pollution indicators, especially of the concentration of sulphur dioxide in the atmosphere. Lichens are organisms that grow in exposed places such as rocks or tree bark. They need to be very efficient at absorbing water and nutrients to grow there.

Answer:

The correct answer would be D, reactivity

Explanation:

Some examples of different types of chemical properties include toxicity, heat of combustion, acidity, flammability, and the many other types of reactivity. I hope this helps you! :)

Answer:

Surface tension is a force that pulls particles at the exposed surface of a liquid toward other liquid particles. Surface tension explains why water forms droplets, like the water droplet that has formed on the leaky faucet pictured in the Figure below.

Answer and Explanation:: Astronomy is the study space and what it contains. Astronomy should be studied by mankind because our survival is directly linked to the cosmos.  The Earth is heated by its nearest star, the Sun, and its ocean tides are directly connected to its only satellite, the Moon.  

Answer:

Astronomy is the study of stars and planets. It is important to humans because it helps us know if there is a supernova close to earth and more imformation about stars and planets that we need to know.

The co-existence curve s/l, also known as the solid-liquid coexistence curve, represents the phase equilibrium between a solid and a liquid at various temperatures and pressures. The slope of this curve can provide important information about the thermodynamic properties of the system.

Typically, the slope of the co-existence curve s/l is positive, indicating that the melting temperature of the solid increases as pressure increases. However, since you have specified that the substance in question is not water, it is important to consider the specific properties of the material.

The slope of the co-existence curve s/l can depend on factors such as the crystal structure of the solid, the intermolecular forces between the solid and liquid phases, and the molecular size and shape of the substance. For example, some materials may exhibit negative slopes, indicating that the melting temperature decreases as pressure increases.

Therefore, without further information about the substance in question, it is difficult to determine the exact slope of the co-existence curve s/l. It is important to note that the slope can vary significantly between different materials, and can provide valuable insight into their thermodynamic behavior.

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Answer:

S02

Explanation:

Based on it

it cause the base when dissolving in water

In this question we have two dilutions occurring, for both cases we will use the dilution formula, which says that the initial concentration and volume of a solution must be equal to the final concentration and volume of the solution, we can better understand that formula presenting it to the question:

M1 * V1 = M2 * V2

where:

M1 = initial molar concentration

V1 = initial volume in liters

M2 = final molar concentration

V2 = final volume in liters

Now let's see what happens in our first dilution:

1.60 M * 0.075 L = M2 * 0.278 L

M2 = 0.43 M, this is the first final concentration

Now we have a solution with 0.43M and 278 mL

In the question we take 139 mL of the 0.43 M solution and add 193 mL, therefore having 332 mL as final volume, let's use the formula again

0.43 M * 0.139 L = M2 * 0.332 L

M2 = 0.180 M as final concentration

The isotopes' number and the sum of the protons and neutrons are the same because the latter is equal to the mass number of an element.

Mass number of an element is the total number of protons and neutrons in an atomic nucleus.

According to this question, a table is presented where the isotope number of different elements equate the sum of the protons and neutrons in the atom of that element.

This is because the sum of the neutrons and protons in an atom is equal to the mass number of an element. This means that the isotope number is the mass number of each isotope.

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Answer:

B

Explanation:

trust me im 100% correct

Answer:

40 - 20 = 20

20/4 = 5m/s

The difference in velocity divided by the rate = acceleration.

The distance between the nearest atoms in a FCC (Face Centered Cubic) lattice is 0.5 x √2, in a BCC (Body Centered Cubic) lattice is 0.5 x √3, and in a SCC (Simple Cubic) lattice is 0.5.

To break it down, in a FCC lattice, the distance between the nearest atoms is 0.5 multiplied by the square root of 2, in a BCC lattice the distance is 0.5 multiplied by the square root of 3, and in a SCC lattice the distance is 0.5.

A face-centered cubic is a unit cell structure which consists of atoms arranged in a cube where each corner of the cube has a fraction of an atom with six additional full atoms positioned at the center of each cube face.

The atoms at the corner of the cube are shared with eight other unit cells.

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The weighted atomic mass of element X is 79.904 amu.

The unknown element that exists as a reddish-brown gas and is a liquid at room temperature is likely to be bromine (Br).

The weighted atomic mass of A can be calculated using the formula:

(weighted atomic mass) = (abundance of isotope 1) x (mass of isotope 1) + (abundance of isotope 2) x (mass of isotope 2)

= (0.5069 x 78.918) + (0.4931 x 80.917)

= 79.904 amu

Therefore, the weighted atomic mass of element X is 79.904 amu.

The reddish-brown gas that is a liquid at room temperature is likely to be bromine (Br). Bromine is a halogen element with atomic number 35 and atomic weight 79.904amu, which is very close to the weighted atomic mass we calculated earlier for element X. Bromine is a highly reactive element and is used in many industrial and medical applications, as well as in the production of flame and agricultural chemicals.

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3906.114 grams of CaCO₃ is required to completely react with 1250 grams of SO₂.

Scrubbing mechanism is a method of removing pollutants, such as sulfur dioxide (SO₂), from industrial exhaust gases. In this mechanism, a substance, such as limestone or lime, is added to the exhaust gases, which react with the pollutants to form solid waste products that can be easily removed.

The balanced chemical equation for the reaction of SO₂ gas and CaCO₃ is:

SO₂ + CaCO₃ → CaSO₃ + CO₂

From the equation, we can see that one mole of SO₂ reacts with one mole of CaCO₃. Therefore, we need to first determine the number of moles of SO₂ in 1250 g of SO₂:

molar mass of SO₂ = 32.066 g/mol

moles of SO₂ = mass of SO₂ / molar mass of SO₂

moles of SO₂ = 1250 g / 32.066 g/mol

moles of SO₂ = 39.012 mol

Since one mole of SO₂ reacts with one mole of CaCO₃, we need 39.012 moles of CaCO₃ to react with the 39.012 moles of SO₂. The molar mass of CaCO₃ is 100.086 g/mol, so we can calculate the mass of CaCO₃ needed as:

mass of CaCO₃ = moles of CaCO3₃ × molar mass of CaCO₃

mass of CaCO₃ = 39.012 mol × 100.086 g/mol

mass of CaCO₃ = 3906.114 g

Therefore, we need 3906.114 grams of CaCO₃ to completely react with 1250 grams of SO₂.

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Using the change of base rule to find the logarithm to four decimal places. the correct answer is 11.4235.

To find the logarithm of 143.2 using the change of base rule, we can choose any base we prefer. Let's use base 10 and natural logarithm (base e) for this calculation.

First, we'll use the change of base formula, which states that log(base b) x = log(base c) x / log(base c) b. In this case, we'll calculate log(base 10) 143.2.

We'll use the natural logarithm (ln) as our intermediary step. The natural logarithm of 143.2 can be calculated as ln(143.2).

Using a calculator, we find that ln(143.2) is approximately 4.9628.

Next, we need to calculate log(base 10) e, which is the logarithm of e with base 10. Using a calculator, we find log(base 10) e is approximately 0.4343.

Finally, we apply the change of base formula:

log(base 10) 143.2 ≈ ln(143.2) / log(base 10) e
                ≈ 4.9628 / 0.4343
                ≈ 11.4235

Rounding to four decimal places, the logarithm of 143.2 using base 10 is approximately 11.4235.

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Answer:

b

Explanation:

b

Answer:

Reducingagent

Explanation:

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Tori

If you have 1.0 moles of each compound, the compound with the greater mass is KF

Mass = moles x mass molar

Mass molar NBr₃ = 253.7187 g/mol

Mass molar  H₃PO₄ = 97.995182 g/mol

Mass molar Fel₃ =436.55841 g/mol

Mass molar KF =58.0967032 g/mol

Therefore, the compound with the higher mass, if you have 1.0 moles of each, is KF.

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Answer:

A)

Explanation:

Entre todos esas materias el hidrógeno es el más fuerte

The mass of H₂O in the oceans is much larger than the mass of H₂O originally contained in the mantle by a factor of approximately 3860

The mass of H2O in the oceans can be calculated using the following formula:mass of H2O in the oceans = volume of seawater × density of seawater × percentage of H2O in seawater where the volume of seawater is the total volume of the oceans on Earth, which is approximately 1.332 billion km³.

The density of seawater is 1.025 gm/cm³, and seawater is 96.5 percent H₂O. Therefore, the mass of H2O in the oceans is:m = 1.332 × 10⁹ km³ × (1.025 gm/cm³) × (0.965)= 1.307 × 10²¹ gmTo compare the mass of H₂O in the oceans to the mass of H₂O originally contained in the mantle, we need to first find the mass of H₂O originally contained in the mantle. The total mass of the mantle is approximately 4.5 × 10²⁴ gm, and it is estimated that the mantle contains between 50 and 100 ppm of H₂O.

Taking an average value of 75 ppm and using the mass of the mantle, we can calculate the mass of H₂O originally contained in the mantle as follows: mass of H₂O in mantle = (75 ppm) × (4.5 × 10²⁴ gm)= 3.38 × 10¹⁹ gm Therefore, the mass of H₂O in the oceans is much larger than the mass of H₂O originally contained in the mantle by a factor of approximately 3860. It is unlikely that the H₂O of the oceans came from the outgassing of the mantle alone, as the amount of H₂O in the oceans is much greater than the amount of H₂O originally contained in the mantle. Other sources of water, such as comets and asteroids, are thought to have contributed to the water content of the oceans.

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The following table for the reactions that occur when black powder is ignited​.

What is black powder?

In order to maintain a reaction, black powder needs a fuel (charcoal), an oxidizer (saltpeter or niter), and a stabilizer (sulfur). Without the oxidising agent, the reaction would take a long time, similar to a wood fire. The saltpeter in gunpowder provides the oxygen that carbon in a fire needs to draw from the surrounding atmosphere.

What is reactions?

A chemical reaction occurs when one or more chemicals, also known as reactants, change into one or more new substances, also known as products. Both chemical constituents and compounds are substances.

The completion of the above table when black powder is ignited-

The name of the compound=Potassium nitrate

The formula of the compound=KNO3

The balanced chemical equation-

4K NO3 + 2K 20 + 2N2 + 302

Type of reaction-

This is a decomposition reaction.

Mole ratio of reactants to products-

reactants : products=4 : 7

The name of the compound=Charcoal

The formula of the compound=C

The balanced chemical equation,

C+02 + CO2

Type of reaction-

This is a combustion reaction.

Mole ratio of reactants to products-

reactants : products=2 : 1

The name of the compound=Sulfur

The formula of the compound=S

The balanced chemical equation,

S + 02 → SO2

Type of reaction-

This is also a combustion reaction.

Mole ratio of reactants to products-

reactants : products=2 : 1

The name of the compound=Potassium chlorate

The formula of the compound=KClO3

The balanced chemical equation,

2K CIO3 → 2KCI + 302

Type of reaction-

This is a decomposition reaction.

Mole ratio of reactants to products-

reactants : products=2 : 5

The name of the compound=Potassium perchlorate

The formula of the compound=KClO4

The balanced chemical equation,

KClO4\righteous KCl+2O2

Type of reaction-

This is a decomposition reaction.

Mole ratio of reactants to products-

reactants : products=1 : 3

Therefore,  above table for the reactions that occur when black powder is ignited​.

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A limiting reagent is a chemical reactant that controls the amount of product produced. The limiting reagent provides the lowest product yield estimated from the available reagents (reactants).

No additional product will develop once the limiting reactant has been completely consumed. The theoretical yield of the reaction is the maximum quantity of product that might be created depending on the limiting reactant. The 'percent yield' is calculated by comparing the actual yield to the theoretical yield..

To calculate the "expected yield" of the product, multiply the reaction equivalents for the limiting reagent by the product's stoichiometric factor. This is the estimated number of millimoles. To get the predicted mass of the product, multiply this value by the MW of the product.

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From the information given, the amount of milk that an adult would need to drink in order to get their RDA for calcium is 826.45cm³. While the amount of milk they would need to drink to get their RDA for B-12 is 266.67. See the explanation below.

Recommended Dietary Allowances (RDAs) are nutrient consumption levels determined by the Food and Nutrition Board to be adequate to fulfill the known nutritional needs of nearly all healthy people based on scientific evidence.

The calculation that justifies the above is given as follows:


For calcium, the RDA is derived as follows;

(500/605) * 1000

= 826.446280992

\(\approx\) 826.45cm³

For Vitamin B-12, the RDA is derived as follows;

(500/4.5) x 2.4

= 266.666666667

\(\approx\) 266.67cm³

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Full Question:

See attached image.

The independent variable when comparing the boiling point of substances having different intermolecular forces is the intermolecular forces of various substances (Option a).

The expression 'intermolecular forces' make reference to the bonds that bind different atoms in macromolecular structures and thus also serves to shape the form of macromolecules.

In conclusion, the independent variable when comparing the boiling point of substances having different intermolecular forces is the intermolecular forces of various substances (Option a).

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So some options can be different, in that case it would be  

The intermolecular forces of various substances

Option 2:

Compounds made of either ions, atoms, or molecules

Answer:

3.01 × 10²³ atoms Ne

General Formulas and Concepts:

Atomic Structure

Stoichiometry

Explanation:

Step 1: Define

Identify

[Given] 10.1 g Ne

[Solve] atoms Ne

Step 2: Identify Conversions

Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

[PT] Molar Mass of Ne: 20.18 g/mol\

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

3.01398 × 10²³ atoms Ne ≈ 3.01 × 10²³ atoms Ne

Answer:

see explanation

Explanation:

Write the balanced COMPLETE ionic equation for the reaction when Na₂CO₃ and AgNO₃ are mixed in aqueous solution. If no reaction occurs, simply write only NR.

Ag (+1) + NO3(-1) + 2 Na(+1) + Co3 (-2)--> Ag2CO3 (s) + 2 Na (+1) + 2NO3(-1)

Answer:

Sublimation.

Explanation:

Sublimation is the conversion between the solid and the gaseous phases of matter, with no intermediate liquid stage