when a flower is ready to become a fruit here would the instruction be found A.Plant ovum B.Nucleus C.Mitochondria D.Ribosomes

The correct answer is exactly 750 g.

Since the mass of board is 750 g, the mass of the pile of sawdust after the whole board is ground down is 750 g.

This is according to the Law of conservation of mass. According to this law, matter can neither be created nor destroyed by any  physical transformations or chemical reactions. In any chemical reaction the mass of the products is equal to the mass of the reactants.

Here the board undergoes a physical transformations from being a whole board to a pile of sawdust. Thus according to the Law of conservation of mass, the mass of the whole board will be equal to the mass of a pile of sawdust.

The answer is 750 grams

Hope this helps!! Just always remember it's not that zeros arent important, it's the starting zeros that arent important

So the important numbers is the first number that's between 1-9

Significant figures, also known as sig figs, are a way to express the precision of a measured or calculated value. They help to indicate the number of reliable digits in a measurement or result.

Significant figures, also known as sig figs, are a way to express the precision of a measured or calculated value. They help to indicate the number of reliable digits in a measurement or result. To calculate sig figs, follow these rules:

For example, the number 0.00342 has three significant figures, while 5000 has only one significant figure.

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Answer:

Chemical equation

                                      HCl +  NH3 ------> NH4Cl

First of calculate the moles of HCl

mole of HCl = Molarity × Vol (L)

mole of HCl = 0.800× 0.018 = 0.014 mole

As the in balance chemical, moles of HCl and NH3 areequal

so

                        moles of NH3= 0.014

                       Molarity of NH3 = moles ÷ V(L) = 0.014/0.005 =  2.88 M

Result:

To find the molar concentration of the ammonia solution, we can use the equation: M1V1 = M2V2. Plugging in the given values, we find that the molar concentration of the ammonia solution is 2.88 M.

To find the molar concentration of the ammonia in the household solution, we can use the equation:

M1V1 = M2V2

where M1 and V1 are the molar concentration and volume of the acid (HCl) solution, and M2 and V2 are the molar concentration and volume of the base (ammonia) solution. Plugging in the given values, we have:

(0.800 M)(18.0 mL) = M2(5.00 mL)

Solving for M2, we find that the molar concentration of the ammonia solution is 2.88 M.

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a) Carbon and oxygen are chemically bonded in carbon dioxide.

The elements lose their individual identities in CO₂, and they always combine o the proportion C:O = 1:2.

You cannot separate the elements from each other by physical means.

Final answer:

Carbon dioxide is composed of carbon and oxygen chemically bonded by two double covalent bonds, forming a new substance that cannot be separated by physical methods and displays a constant proportion of carbon to oxygen across all samples.

Explanation:

Among the statements provided about carbon dioxide, the correct one is that carbon and oxygen are chemically bonded in it. Carbon dioxide is a chemical compound made up of one carbon atom and two oxygen atoms, and these are joined by two double covalent bonds, represented by the chemical formula O=C=O. This structure means that the carbon and oxygen atoms do not retain their original identity within the compound; they form a completely new substance with different properties. Moreover, this compound cannot be separated into its constituent elements using physical methods; chemical reactions would be required to break these bonds. Additionally, in a large sample of carbon dioxide, the proportion of carbon to oxygen remains constant because molecular compounds consist of identical molecules.

Since a water molecule is H2O, you would divide 126 hydrogen molecules by 2, and you would get 63. That means you have 63 double hydrogen molecules, and 58 oxygen molecules to pair up with them. So that means you could have 58 molecules of water, with 5 double hydrogen molecules, so basically 10 extra molecules of hydrogen along with the H2O molecules. Hope I helped! :)

Answer : The number of moles of water formed can be 116 moles.

Explanation :

First we have to calculate the limiting and excess reagent.

The balanced chemical reaction will be:

[tex]2H_2+O_2\rightarrow 2H_2O[/tex]

From the balanced chemical reaction we conclude that,

As, 1 mole of [tex]O_2[/tex] react with 2 mole of [tex]H_2[/tex]

So, 58 moles of [tex]O_2[/tex] react with [tex]58\times 2=116[/tex] moles of [tex]H_2[/tex]

From this we conclude that, [tex]H_2[/tex] is an excess reagent because the given moles are greater than the required moles and [tex]O_2[/tex] is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of [tex]H_2O[/tex]

From the reaction, we conclude that

As, 1 mole of [tex]O_2[/tex] react to give 2 mole of [tex]H_2O[/tex]

So, 58 moles of [tex]O_2[/tex] react to give [tex]58\times 2=116[/tex] moles of [tex]H_2O[/tex]

Therefore, the number of moles of water formed can be 116 moles.

Hello!

Each element on the periodic table ALWAYS begins with an UPPERCASE letter, for example, hydrogen is written as H.

If the element has two letters, for example lithium, then the first letter is UPPERCASE, and the next letter is LOWERCASE. This is shown as Li.

If there's two or more elements (also known as a compound), (ex. sodium chloride), then it follows the same rules, the first letter is in UPPERCASE and next letter is LOWERCASE, but when a new element is introduced (in this case chlorine), the first letter is UPPERCASE and the next letter in LOWERCASE. Sodium is Na and Chlorine is Cl. As a compound it is NaCl, and it's name is sodium chloride.  

Basic rules:

The rules for writing the symbols of elements in chemistry are based on abbreviations derived from common names or other languages, with most symbols having one or two letters. The first letter of the symbol is capitalized to avoid confusion with other notations.

The rules for writing the symbols of elements in chemistry are as follows:

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A 1 mol dm-3 hydrochloric acid will likely not have a notable effect on a bulb unless the bulb is in direct contact. Hydrochloric acid is generally used for reactions with metals, but if the bulb contains metals then this can cause corrosion.

The effect of 1 mol dm-3 hydrochloric acid on a bulb would most likely not be substantial unless the bulb was physically placed in the acid. The point of your question appears to be concerning a reaction between hydrochloric acid and some form of material. Hydrochloric acid is a strong acid that is widely utilized in industries for the production of metal chlorides, dyes, glue, and glucose, among other substances. When it reacts with metals, a reaction occurs to form a salt and hydrogen gas. However, in the context of an electric bulb, unless the bulb is made of a specific material that reacts with HCl, there may not be a significant change. It's important to keep in mind that hydrochloric acid is corrosive and can cause damage to the surface of the bulb, particularly if it's made of metal or contains metal elements.

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Answer:- 27.7 grams of [tex]PbI_2[/tex] are produced.

Solution:- The balanced equation is:

[tex]Pb(NO_3)_2+2NaI\rightarrow PbI_2+2NaNO_3[/tex]

let's convert the grams of each reactant to moles and calculate the grams of the product and see which one gives least amount of the product. This least amount would be the answer as the least amount we get is from the limiting reactant.

Molar mass of [tex]Pb(NO_3)_2 = 207.2+2(14.01)+6(16)  = 331.22 gram per mol

molar mass of NaI = 22.99+126.90 = 149.89 gram per mol

Molar mass of [tex]PbI_2[/tex] = 207.2+2(126.90) = 461 gram per mol

let's do the calculations for the grams of the product for the given grams of each of the reactant:

[tex]28.0gPb(NO_3)_2(\frac{1molPb(NO_3)_2}{331.22gPb(NO_3)_2})(\frac{1molPbI_2}{1molPb(NO_3)_2})(\frac{461gPbI_2}{1molPbI_2})[/tex]

= [tex]39.0gPbI_2[/tex]

[tex]18.0gNaI(\frac{1molNaI}{149.89gNaI})(\frac{1molPbI_2}{2molNaI})(\frac{461gPbI_2}{1molPbI_2})[/tex]

= [tex]27.7gPbI_2[/tex]

From above calculations, NaI gives least amount of [tex]PbI_2[/tex], so the answer is, 27.7 g of [tex]PbI_2[/tex] are produced.

Answer:

27.7 g

Explanation:

i got it right on the test

For example, certain medications may influence the results of the test.

Drug test can show the presence of illicit or prescription drugs on hair samples, although the person has not used these drugs.

Some of false positive drug use is because of this medications: antihistamines, decongestants, antibiotics, antidepressants, analgesics and antipsychotics.

False positives in hair drug tests can occur due to cross-reactivity with medications, passive exposure, external contamination, and handling errors. Confirmatory testing with GC-MS is suggested after a positive result. The reliability of a test also depends on laboratory standards and procedures.

False positives in hair drug tests can occur for a variety of reasons. These tests are designed to detect the presence of drugs and their metabolites in the hair. However, sometimes substances that have a similar chemical structure to those being tested for can interfere with the results, leading to a false positive.

Cross-reactivity with other medications, passive exposure to drugs, external contamination, and even errors in the handling or processing of the hair sample can result in an inaccurate test outcome. It's also possible for hair products or treatments to affect the test. If someone receives a positive result but has not used drugs, they should request a confirmatory test, like gas chromatography-mass spectrometry (GC-MS), which can provide a more accurate result.

Furthermore, drug test accuracy can depend on the standards and procedures of the testing lab. Factors such as how the hair is washed and the cutoff levels for a positive result can vary between labs, affecting the test's reliability. It's important to ensure that drug testing is conducted by a reputable and certified laboratory to minimize the likelihood of a false positive.

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The general properties of solids reflect the orderly arrangement of their particles and the fixed locations of their particles.

Final answer:

The structure of solids, whether crystalline, amorphous, or metallic, dictates their properties such as melting points, hardness, thermal conductivity, electrical conductivity, malleability, ductility, elasticity, and strength.

Explanation:

The structure of solids is intimately linked to their properties. The arrangement of atoms, ions, or molecules in a solid determines how the solid will interact with its environment. For instance, a solid with a crystalline structure, where the particles are arranged in a highly ordered pattern, typically has distinct melting and boiling points.

Materials like diamond, with a rigid lattice structure, have high hardness and high thermal conductivity because of the strong covalent bonds holding the carbon atoms in place. In contrast, amorphous solids like glass lack a long-range order, resulting in different physical properties, such as varying melting points and lower thermal conductivity.

In metals, the structure is characterized by a metallic bonding where electrons are delocalized, allowing them to conduct electricity and heat efficiently. Additionally, the arrangement of atoms within metals allows them to deform under stress without breaking, giving them malleability and ductility.

Moreover, polymers have structures that range from crystalline to amorphous, determining their elasticity, strength, and plasticity. For example, the highly ordered structure of Kevlar makes it incredibly strong, while the less ordered structure of rubber makes it flexible and stretchy.

Thus, understanding the relationship between structure and properties is essential in material science for predicting and explaining the behavior of different materials.

Hello!

To find the number of moles present in 16.2 grams of lead, we need to know how much one mole of lead weighs.

1 mole is equal to the atomic mass of an element, so, 1 mole of lead is equal to about 207.2 grams.

To find that, divide the given amount of lead by 1 mole of lead (207.2 grams).

16.2 grams / 207.2 grams ≈ 0.07818

Therefore, the amount of moles present in 16.2 grams of lead is about 0.078 moles. (round to amount of sigfigs: 0.0782 moles)

Answer:

mass: 96.5 g

volume: 5 cm^3

density: 19.3 g/cm^3

The object you found in the creek is a gold nugget

Explanation:

If a mass of 96.5g will balance the object in a pair of scales, then its mass is 96.5 g.

If the object displaces 5 mL of water when you introduce it in some vessel, then its volume is 5 cm^3 (notice that mL and cm^3 are numerically equal).

The density of an object is the quotient between mass and volume, then the density of the object is: 96.5 g/5 cm^3 = 19.3 g/cm^3

From its density it can be deduced that the object is a gold nugget.

The density value can provide clues about the material composing the object, as different substances have different densities.

Mass: Mass refers to the amount of matter an object contains.

Volume: Volume is the amount of space occupied by an object. It is usually measured in cubic centimeters (cm³) or milliliters (mL). In the given scenario, the object displaces 5 mL of water, indicating that its volume is 5 cm³.

The equation for density is:

Density = Mass / Volume

In the given scenario, the density of the object can be calculated once its mass is determined.

Divide the mass (in grams) of the object by its volume (in cubic centimeters) will give the density (in grams per cubic centimeter, g/cm³).

To identify the object, it would be necessary to compare its density with known densities of various substances. The density value can provide clues about the material composing the object, as different substances have different densities.

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Answer:

Liquid: D) Assumes the shape of the part of the container from the bottom up

Plasma: B) Charged particles that do not have a definite shape or volume

Solid: C) Has a fixed volume and shape

Gas: A) Takes the shape and volume of an entire container

The correct pairings are:

Here are the matches between the terms and their definitions:

1. **Gas**: Charged particles that do not have a definite shape or volume.

2. **Solid**: Has a fixed volume and shape.

3. **Plasma**: Assumes the shape and volume of an entire container.

4. **Liquid**: Takes the shape of the part of the container from the bottom up.

So, the correct pairings are:

- Gas: Charged particles that do not have a definite shape or volume.

- Solid: Has a fixed volume and shape.

- Plasma: Assumes the shape and volume of an entire container.

- Liquid: Takes the shape of the part of the container from the bottom up.

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When an anion forms, more electrons are transferred to it.

Anions are negatively-charged ions that is when an anion forms, more electrons are transferred to it. Anions are common among non metals.

Cations are also called positive ions. Cations are common among metals.

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The correct option is D, as anions are negative ions formed by the transfer of extra electrons to a nonmetal atom, which leads to a negative charge.

The true statement about ions among the options provided is D. When an anion forms, more electrons are transferred to it.

Anions are negative ions formed when a nonmetal atom gains one or more electrons, therefore increasing its number of electrons compared to protons, which results in a negative charge. Nonmetals, especially those in groups 16 and 17 of the periodic table, readily form anions by gaining electrons to achieve the electron configuration of the next noble gas. In contrast, cations are positive ions formed when a metallic atom loses one or more electrons from its valence shell. Therefore, the idea that cations are common among nonmetals is incorrect, as nonmetals typically form anions.

The charge of ions is indeed indicated with a number followed by a plus or minus sign, as stated in option C. However, it is critical to note that the convention is to write the sign first, then the magnitude of the charge.

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A. Gases

The state of matter that can be compressed is gas.

Answer:

Gases (C)

Explanation:

I took the test

Covalent bonds only form when electrons are shared between two nonmetals.

The two atoms which have low electronegativity difference that is they are non metals can form a covalent bond.

Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.

Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.

Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules. Non metals have low electronegativity difference  and can easily form covalent bond.

Thus,non metals have low electronegativity difference  and can easily form covalent bond.

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conduction - the transfer of heat to an object through contact

Answer: Conduction

Explanation:

D. 0.044 m3

hope this helped

Answer:

D. 0.044 m3

Explanation:

took test

When this happens, you are seeing c) a new moon. You won't be able to see the moon.

A thing used to tie something or to fasten things together.

"she brushed back a curl that had strayed from its bonds"

OR

An agreement with legal force, in particular.

Any of several forces, especially the ionic bond, covalent bond, and metallic bond, by which atoms or ions are bound in a molecule or crystal.

Spring tides occur during new and full moon phases, with Earth, sun, and moon aligned, causing high tidal range. Neap tides occur during quarter moon phases, with sun and moon at right angles, resulting in smaller tidal range. The proximity of the moon to Earth explains its dominant effect on tides compared to the sun.

Spring tides occur when the Earth, sun, and moon align during the new moon and full moon phases, resulting in a combined gravitational pull that causes very high and low tides. The tidal range during spring tides is the greatest. On the other hand, neap tides happen during the first and third quarter moon phases when the sun and moon are at right angles to each other, leading to a cancellation of their combined gravitational effects and resulting in a smaller tidal range.

The reason why the gravitational pull of the sun on tides is less effective than that of the moon is due to the moon's proximity to Earth; despite the sun's larger size and stronger overall gravity, the moon is closer, thus exerting a greater influence on Earth's tides.

Tides do not occur at the same time every day because the moon rises approximately 50 minutes later each day, and as a result, high and low tides are shifted in time as well. The type of tides experienced in different geographical locations (diurnal, semi-diurnal, or mixed) and their size can also be affected by other factors such as amphidromic circulation, which is caused by the Earth's rotation and other local conditions.

color

density

volume

mass

boiling point

melting point

Answer:

The air pressure will increase

Explanation:

The bottle is sealed, therefor the number of molecules can't change. The air inside the bottle may be considered as an ideal gas, and these have a particular set of laws they must obey.

In this case the law that apllies is Boyle's Law, which states that at a constant temperature, the pressure P of a gas varies inversely with its volume V, or P.V = k, where k is a constant.

If the volume is decreasing, the pressure must increase.

When you put a popsicle mold in the fridge, the mold is in a liquid state. Therefore, when it is frozen it turns into a solid state. When you are trying to figure out these types of scenarios you can always ask this question. Can the object go back to its original form? For example, if you burn wood you can't bring it back to the way it was before you burned it. Therefore, since you can't bring it back, it is a chemical change. In this case however, you CAN bring it back. If you freeze the popsicle mold, it will be made of the same stuff, just in a different state of matter. If you put the popsicle outside and keep it in the mold, then it will turn back into the liquid state. Since in this case, you can change it back and forth, it is a physical change.

Placing popsicle molds in the fridge is classified as a physical change because it alters the state of the substance (from liquid to solid) without changing the substance's identity.

Putting popsicle molds in the fridge is an example of a physical change rather than a chemical change. Physical changes are temporary and reversible, involving alterations to states of matter without changing the substance’s identity. Freezing a liquid into a solid does not alter the nature or identity of that substance, in this case, the popsicle mix. However, a chemical change would involve the composition of the substance being altered, which doesn't occur when popsicle molds are put in the fridge to freeze. So, we conclude that when popsicle molds are placed in the fridge, it causes a physical change, not a chemical change.

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The composition is 25.1 % C, 4.22 % H, 9.79 % N, 49.7 % Cl, 11 % O.

We must calculate the masses of C, H, N, Cl, and O from the masses given.

Mass of C in 150 mg X =138 mg CO₂ × (12.01 mg C/44.01 mg CO₂) = 37.66 mg C

Mass of H in 150 mg X = 56.6 mg H₂O × (2.016 mg H/18.02 mg H₂O) = 6.332 mg H

Mass of N in 200 mg X = 23.8 mg NH₃ × (14.01 g N/17.03 g NH₃) = 19.58 mg N

Mass of N in 150 mg X = 19.58 mg N × (150 mg X/200 mg X) = 14.68 mg N

Mass of Cl in 125 mg X = 251 mg AgCl × (35.45 mg Cl/143.32 mg AgCl) = 62.08 mg Cl

Mass of Cl in 150 mg X = 62.08 mg Cl × 150 mg /125 mg X) = 74.50 mg Cl

Mass of O in 150 mg X = (150 – 37.66 -6.332 -14.68 – 74.50) mg = 16.8 mg

% C  = 37.66 mg/150 mg × 100 % =   25.1    %

% H  = 6.332 mg/150 mg × 100 % =     4.22 %

% N  = 19.58 mg/200 mg × 100 % =     9.79 %

% Cl = 62.08 mg/125 mg × 100 %  =  49.7   %

% O  = 16.8 mg/150 mg × 100 %     =   11       %

                                           TOTAL = 100      %

Page:1  

Choice 3 would be correct

Page:2

Choice 3 would be correct again

Page : 3

Choice 3

Page: 4

Yes, This is true

Answer:

The correct answer would be cytokinesis.

Cytokinesis is the part of the cell cycle which takes place after telophase of mitosis.

It is the phase during which the cytoplasm or cellular contents of a parent cell are divided into the two daughter cells.

In animal cells, cytokinesis is achieved by cleavage furrow formation whereas, in plant cells, it is achieved by cell plate formation.

Metals have delocalized electrons due to the nature of their atomic structure and bonding. In metallic bonding, the valence electrons are not bound to a single atom but are shared among all the atoms in the metal. This sharing creates a sea of electrons that is free to move throughout the metal.

Here's the explanation and logic behind this phenomenon:

1. Atomic Structure of Metals: Metals are characterized by having one, two, or three valence electrons in their outermost shell. These electrons are loosely held and can be easily removed or shared.

2. Metallic Bonding: In a metal, the positively charged metal ions are held together by the negatively charged electrons. Unlike ionic or covalent bonds, which involve the transfer or sharing of electrons between specific atoms, metallic bonds are formed by the attraction between the metal cations and the delocalized electrons that surround them.

3. Delocalization: The valence electrons in a metal are not localized between specific atoms but are instead spread out over the entire metal lattice. This delocalization is energetically favorable because it allows the electrons to move freely and occupy a range of energy levels.

4. Energy Bands: In metals, the atomic orbitals overlap to form energy bands. The valence electrons occupy the highest energy band, which is only partially filled. Because of this, electrons can easily gain energy and move within this band, leading to high electrical and thermal conductivity.

5. Mobility of Electrons: The delocalized electrons can move freely throughout the metal. When an electric field is applied, these electrons can drift in a particular direction, resulting in an electric current. Similarly, when heat is applied, the electrons can carry the thermal energy throughout the metal.

6. Strength and Malleability: The delocalized electrons also contribute to the strength and malleability of metals. The sea of electrons holds the metal ions together, allowing the ions to slide past each other without breaking the metallic bond, which is why metals can be hammered into different shapes without shattering.

In summary, metals have delocalized electrons because the atomic structure and the type of bonding in metals favor the sharing of valence electrons across the entire lattice, creating a mobile sea of electrons that is responsible for the characteristic properties of metals, such as conductivity, luster, and malleability.