What is a pure substance that can only be separated into two or more simpler substances using chemical changes called?

Answer:

The molecular formula lists the symbol of each element within the compound followed by a number (usually in subscript). The letter and number indicate how many of each type of element are in the compound. If there is only one atom of a particular element, then no number is written after the element.

The statement is true. Because without condensation nuclei, a cooling air mass can become supersaturated.

Condensation nuclei are tiny particles in the air that provide a surface for water vapor to condense onto, forming droplets or ice crystals. In the absence of condensation nuclei, the cooling air mass may become supersaturated, meaning it contains more water vapor than it can hold at its current temperature and pressure. This can lead to the formation of cloud droplets or ice crystals, which require a surface to initiate condensation.

Learn more about Condensation nuclei: https://brainly.com/question/15387871

#SPJ11

Answer:

I think it's C but I'm atlessy 60% sure :]

The stability of a nucleus is dependent on the neutron - proton ratio. The most stable nucleus is 70 protons, 87 neutrons.

A nucleus will be stable if the neutron proton ratio is less than 1.5 but greater than 1. This range is generally called the band of stability.

Now, we know that the most stable nucleus will have a lower neutron - proton ratio and that is the nucleus contaning 70 protons, 87 neutrons.

Learn more about stability: https://brainly.com/question/9904853?

Answer: A. 70 protons, 98 neutrons

Explanation: Got it on the quiz

An animal cell, a plant cell, and a paramecium cell have different responses in hypotonic, hypertonic, and isotonic solutions.

In a hypotonic solution, an animal cell swells and may burst due to an influx of water, while a plant cell becomes turgid and firm due to the presence of a cell wall. A paramecium cell also swells but has a contractile vacuole to pump out excess water. In a hypertonic solution, an animal cell shrivels up and may die due to water loss, while a plant cell undergoes plasmolysis, where the cytoplasm shrinks away from the cell wall. A paramecium cell also undergoes plasmolysis and may die. In an isotonic solution, an animal cell and a paramecium cell maintain their shape and size, while a plant cell remains turgid but does not burst due to the balance of water entering and leaving the cell. Overall, the presence or absence of a cell wall and other structures such as contractile vacuoles can greatly affect the response of different types of cells in different types of solutions.

For more questions like Cells visit the link below:

https://brainly.com/question/2128169

#SPJ11

Answer:

and I quenot se the question

Explanation:

ok firts you dirent take a god picture

The final concentration of the solution is 0.217 M.

To find the final concentration of the solution, we need to consider the dilution process in two steps.

Step 1:
A 70.0 mL portion of a 1.50 M solution is diluted to a total volume of 248 mL.

To solve this, we can use the formula for dilution: C1V1 = C2V2, where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

Given:
C1 = 1.50 M
V1 = 70.0 mL
C2 = ?
V2 = 248 mL

Using the formula, we can calculate C2 as follows:
(1.50 M)(70.0 mL) = C2(248 mL)

C2 = (1.50 M)(70.0 mL) / (248 mL)
C2 = 0.425 M

Step 2:
A 124 mL portion of the previous solution is diluted by adding 119 mL of water.

We can again use the dilution formula to find the final concentration.
C1 = 0.425 M (from Step 1)
V1 = 124 mL
C2 = ?
V2 = 124 mL + 119 mL = 243 mL

Using the formula, we can calculate C2 as follows:
(0.425 M)(124 mL) = C2(243 mL)

C2 = (0.425 M)(124 mL) / (243 mL)
C2 = 0.217 M

Therefore, the final concentration of the solution is 0.217 M.

In summary:
- In the first step, the initial 1.50 M solution is diluted to a concentration of 0.425 M by adding water.
- In the second step, a portion of this solution is further diluted, resulting in a final concentration of 0.217 M.

Learn more about final concentration  here:-

https://brainly.com/question/30887630

#SPJ11

The mass number is the atomic mass rounded to a whole number, i.e., which is a value that rounds the atomic weight to a near number.

The expression mass number is used in chemistry to denote the total amount of subatomic particles i.e. atomic protons and neutrons, which are present in a given atom (for example hydrogen has only one proton and one neutron).

Therefore, with this data, we can see that mass number denotes the overall amount of protons and neutrons present in a given atom, which is equal to one in the hydrogen atom

Learn more about the mass number here:

https://brainly.com/question/28409714

#SPJ1

Answer:

Chemical bonding, any of the interactions that account for the association of atoms into molecules, ions, crystals, and other stable species that make up the familiar substances of the everyday world.

Explanation:

Have a nice day:)

Answer: A connection between two surfaces or objects that have been joined together, especially by means of an adhesive substance, heat, or pressure.

Explanation: The bond may result from the electrostatic force or attraction between oppositely charged icons as in iconic bonds or through the sharing of electrons as in covalent bonds.

Answer:

molecules

.5 × 6.02×10²³

3.01 × 10²³ molecules

I hope it's helps you

The mass of 8.50 × 10²² NH₃ molecules is ≈ 1.84 g.

Solution:

Number of molecules = 8.50 × 10²² = 8687

Number of molecules = Number of moles × Avogadro's Number

8687 = Number of moles × 6.02×10^23

Number of moles = 8687\ 6.02×10^23 = 1443×10^-23 moles

Mass = Number of moles × Molar Mass = 1443×10^-23 × 17.031 = 24576×10^-23 = 2.4576×10^-18 g.

A quantitative measure of inertia, a fundamental property of all matter. In effect, it is the resistance that an object offers to changes in velocity or position when a force is applied. The greater the mass of an object, the smaller the change caused by an applied force.

Learn more about The mass here:- https://brainly.com/question/19385703

#SPJ4

Answer:

The solar wind is a stream of charged particles released from the upper atmosphere of the Sun, called the corona. ... Its particles can escape the Sun's gravity because of their high energy resulting from the high temperature of the corona, which in turn is a result of the coronal magnetic field.

Explanation:

Disrupts communication systems

Composed of charged particles

Travels at about 400 km/s

The electronic configuration can be used to know the details of atom.

The question is incomplete so I will educate you generally about electronic configuration.

The electronic configuration of an atom refers to the arrangement of electrons in its energy levels or orbitals.

The electrons in an atom occupy specific energy levels, with the innermost energy level having the lowest energy and being occupied by the most electrons. Each energy level can contain a certain number of electrons, and electrons occupy the lowest energy level available to them.

Learn more about electronic configuration:https://brainly.com/question/29757010

#SPJ1

It is crucial to ensure that pentacene quinone is completely dried before reacting it with hexynyl lithium to achieve the desired reaction and product.

If pentacenequinone is not completely dried of methanol and/or any residual water before reacting with hexynyl lithium, it can have several consequences. First, the presence of water or methanol can hinder the reaction and prevent the desired reaction from occurring. This could result in a lower yield or no reaction at all.

Second, if the reaction does occur, the presence of water or methanol can lead to side reactions or unwanted byproducts. These side reactions can alter the desired product or result in the formation of impurities.

To know more about  pentacene visit:-

https://brainly.com/question/13342488

#SPJ11

Chloroform (CHCL3) was one of the first anesthetics used in medicine. The Chloroform molecule contains 26 valence electrons total. Chloroform has four bonds hence, eight valence electrons are part of covalent bonds.

An electron exchange that results in the formation of electron pairs between atoms is known as a covalent bond. Bonding pairs or sharing pairs are the names given to these electron pairs. the consistently maintained equilibrium of the forces that attract and repel atoms.

Three chlorine atoms and one hydrogen atom make up the CHCl3 molecule, which is held together by the single carbon atom in the middle. Three C-Cl bonds and one C-H bond make up the four covalent bonds that are present. There are four regions of electrons produced by this arrangement.

In the Ch₃cl lewis structure, carbon has 4 valence electrons in its outermost shell and needs 4 more electrons to complete its octet. The exception to the octet rule is hydrogen, which has a complete duplet, whereas chlorine only needs one electron to complete its octet.

Thus,  chloroform has four bonds hence, eight valence electrons are part of covalent bonds.

To learn more about covalent bond, follow the link;

https://brainly.com/question/10777799

#SPJ6

The appropriate position for a client with severe ascites would be Fowler's position. This position allows for improved breathing and reduces pressure on the abdomen.

Side-lying and Sims positions may increase discomfort and pressure on the affected area, while reverse Trendeleburg position may worsen the condition by increasing fluid accumulation in the abdomen.

The accumulation of extra fluid in the abdominal cavity is referred to as ascites. Ascites can be divided into three categories: mild, moderate, and severe, depending on the degree of fluid buildup.

Uncomplicated and refractory ascites are the two forms of ascites. Refractory ascites, on the other hand, is less common and extremely difficult to cure, leading to a high death rate. Uncomplicated ascites is the most frequent kind and responds well to treatment. Refractory ascites and renal disease are frequently linked.

To learn more about ascites, visit:

https://brainly.com/question/30528010

#SPJ11

The new volume of the gas is approximately 76.76 mL.

To solve this problem, we can use the combined gas law, which relates the initial and final conditions of pressure, volume, and temperature of a gas sample. The combined gas law is expressed as:

(P₁ * V₁) / (T₁) = (P₂ * V₂) / (T₂)

Where:

P₁ = Initial pressure

V₁ = Initial volume

T₁ = Initial temperature

P₂ = Final pressure

V₂ = Final volume (what we need to calculate)

T₂ = Final temperature

Let's plug in the given values into the equation:

P₁ = 725 mm Hg

V₁ = 75.0 mL

T₁ = 18 degrees Celsius = 18 + 273.15 = 291.15 K

P₂ = 800 mm Hg

T₂ = 25 degrees Celsius = 25 + 273.15 = 298.15 K

Now we can rearrange the equation and solve for V₂:

(V₂) = (P₂ * V₁ * T₂) / (P₁ * T₁)

Substituting the values:

V₂ = (800 mm Hg * 75.0 mL * 298.15 K) / (725 mm Hg * 291.15 K)

Calculating the expression:

V₂ ≈ 76.76 mL

Therefore, the new volume of the gas is approximately 76.76 mL.

Learn more about combined gas law from the link given below.

https://brainly.com/question/30458409

#SPJ4

The given statement "A precipitate of lead(ii)chloride forms when 200.0 mg of NaCl is dissolved in 0.250 l of 0.12 m lead(ii)nitrate" is true because the ion product, Q, exceeds the solubility product constant, Ksp, for lead(II) chloride.

The first step in solving this problem is to determine whether or not a precipitate of lead(II) chloride will form. This can be done by calculating the ion product, Q, and comparing it to the solubility product, Ksp.

The balanced equation for the reaction is:

Pb(NO₃)₂ + 2NaCl → PbCl₂ + 2NaNO₃

From the equation, we can see that 1 mol of Pb(NO₃)₂ reacts with 2 mol of NaCl to form 1 mol of PbCl₂. Therefore, the moles of Pb(NO₃)₂ in the solution are:

0.12 mol/L x 0.250 L = 0.030 mol

The moles of NaCl in the solution are:

(200.0 mg / 58.44 g/mol) / 0.250 L = 0.0136 mol

Since there are 2 moles of NaCl for every 1 mole of Pb(NO₃)₂, the limiting reactant is NaCl, and all of it will react. This means that 0.0136 mol of PbCl₂ will be formed.

Now, we can calculate the ion product, Q, using the concentrations of Pb²⁺ and Cl⁻ ions in the solution:

[Pb²⁺] = 0.0136 mol / 0.250 L = 0.0544 M

[Cl⁻] = 2 x 0.0136 mol / 0.250 L = 0.109 M

Q = [Pb²⁺][Cl⁻]² = 0.0544 M x (0.109 M)² = 0.000654

Since Q < Ksp, a precipitate of PbCl² will form.

This problem involves the use of the solubility product, Ksp, which is a measure of the maximum amount of a compound that can dissolve in a solution at a given temperature. If the ion product, Q, exceeds Ksp, a precipitate will form.

In this case, we are given the Ksp of PbCl₂, which is 1.7 x 10⁻⁵. We are also given the concentration of Pb(NO₃)₂ and the mass of NaCl, from which we can calculate its concentration. Using these values, we can determine the moles of PbCl₂ that will be formed and the concentrations of Pb²⁺ and Cl⁻ ions in the solution. Finally, we calculate Q and compare it to Ksp to determine whether or not a precipitate will form.

To know more about the Precipitate, here

https://brainly.com/question/29342832

#SPJ4

The average atomic mass of the element which is represented in the above diagram is 16.

An element is defined as a substance which cannot be split into simpler forms by ordinary chemical process. There are different categories of elements including the metals, nonmetals and metalloids.

That being said, the oxygen is a chemical element which belongs to group 6 and period 2 in the periodic table, has valence electron of 6, and an average mass of 16. In addition to this, oxygen is a metal. Some few examples of other chemical elements include:

So therefore, it can be deduced from the explanation given above that oxygen is a chemical element which is diatomic.

Complete question:

What is the average atomic mass of the element represented above

a. 8

b. 16

c. 32

d. 64

Read more atomic mass:

https://brainly.com/question/3187640

#SPJ1

Explanation:

the first question's answer is a

the second question's answer is c

Answer:

Answer A

Explanation:

atmosphere is made up of approx 78% N and 21% O2

The correct statements are that a rock is considered an ore when it contains at least one metallic mineral in sufficient amounts to be extracted profitably and when it contains fluorite or sulfur minerals in sufficient amounts to be extracted profitably.

When it contains at least one metallic mineral in sufficient amounts to be extracted profitably.

When it contains fluorite or sulfur minerals in sufficient amounts to be extracted profitably.

Step-by-step explanation:

When it occurs in sufficient amounts to be used to build roads and buildings: This statement is incorrect. Rocks that are used for construction purposes, such as limestone or sandstone, are not considered ores unless they also contain economically valuable minerals.

Only when it contains lead: This statement is incorrect. Ores are not limited to containing only lead. Ores can contain various metallic minerals, not just lead.

When it contains at least one metallic mineral in sufficient amounts to be extracted profitably: This statement is correct. Ores are rocks that contain valuable metallic minerals in concentrations that make extraction economically feasible. These minerals can include gold, silver, copper, aluminum, zinc, and many others.

Only when it contains iron: This statement is incorrect. While iron ores are commonly known and widely used, ores are not limited to containing only iron. There are numerous other metallic minerals that can be extracted profitably from rocks.

When it contains fluorite or sulfur minerals in sufficient amounts to be extracted profitably: This statement is correct. Fluorite and sulfur are examples of non-metallic minerals that can be extracted profitably from rocks, and if a rock contains these minerals in sufficient quantities, it can be considered an ore.

learn more about from  metallic mineral the given link:

https://brainly.com/question/89259

#SPJ11

Atomic # / Symbol / Name / Melting Point (ºC) / Boiling Point (ºC)

1        /         H    /    Hydrogen   /   -259.14   /   -252.87

2      /        N      /   Nitrogen      /   -209.86    /   -195.8.

3     /       NH3   /  Compound Ammonia  /  -77.7  /  -33.3

For Hydrogen, the Melting point is -259.14, while for the Nitrogen it's -209.86. And the boiling point for Hydrogen is -252.87, while for the Nitrogen it's -195.8. The difference is that Hydrogen has less temperature in melting and boiling points, while Nitrogen has more. And for the Ammonia, this one has the most temperature, being at -77.7 degrees celsius for melting point, which is -107.9°F, and being at -33.3 degrees celsius, which is -28.01°F

Answer:

734.0 grams

Explanation:

Because 16.0 and 855 mL it is 734.0 grams :) hope it helps

Water molecules have a stronger attraction than helium due to the presence of dipole-dipole interactions resulting from the polarity of the water molecule.

Water molecules have a stronger attraction than helium due to the difference in their intermolecular forces. Intermolecular forces are the attractive forces that exist between molecules and play a crucial role in determining the physical properties of substances.

Water molecules have a polar nature, meaning they have a partial positive charge on the hydrogen atoms and a partial negative charge on the oxygen atom.

This polarity arises from the unequal sharing of electrons in the O-H bonds due to oxygen's higher electronegativity compared to hydrogen. The presence of polar bonds within the water molecule gives rise to a dipole-dipole interaction.

In contrast, helium is a noble gas and exists as individual atoms. Helium atoms are electrically neutral and do not possess a permanent dipole moment.

As a result, helium exhibits weak intermolecular forces known as London dispersion forces or Van der Waals forces. These forces arise due to temporary fluctuations in electron distribution, causing temporary dipoles that induce dipoles in neighboring atoms or molecules.

The dipole-dipole interaction in water is stronger than the London dispersion forces in helium. This is because dipole-dipole forces are more significant when there are permanent dipoles in the molecules.

The stronger attraction between water molecules leads to higher boiling and melting points compared to helium.

For more such question on molecules. visit :

https://brainly.com/question/24191825

#SPJ8

If you were to run around the room so fast that you collapsed from exhaustion before the reaction time was up, it would not have a direct impact on the reaction rate.

The reaction rate is determined by factors such as the nature of the reactants, concentration, temperature, and presence of catalysts or inhibitors. Your physical activity or exhaustion would not directly affect these factors.

However, it is worth noting that physical activity and exhaustion can indirectly influence the reaction rate through changes in temperature and concentration. Running around the room vigorously could increase your body temperature, which may lead to an increase in the temperature of the reaction mixture if you are in close proximity to it. Higher temperatures generally increase reaction rates by providing more kinetic energy to the reacting molecules, facilitating successful collisions.

Furthermore, if you were responsible for maintaining a specific concentration or conditions during the reaction, your exhaustion might prevent you from doing so effectively. For instance, if you were supposed to continuously stir the reaction mixture or add reagents at specific intervals, your exhaustion could interrupt the desired conditions and potentially affect the reaction rate.

In summary, while your physical activity and exhaustion may indirectly impact the reaction rate by influencing temperature or maintaining desired conditions, they do not directly affect the fundamental factors that determine reaction rate.

Learn more about reaction rate in the link:

https://brainly.com/question/12904152

#SPJ11

Answer:

0.1125  mol/L

Explanation:

application fomula:

C1V1=C2V2

C1 is concentration of Ba(OH)2

V1 is volume of Ba(OH)2

C2 is concentration of HCl

V2 is volume of HCl

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

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

From the question we have

\(volume = \frac{112}{13.6} \\ = 8.23529\)

We have the final answer as

Hope this helps you