sheets, tubes, and spheres are only possible when the atoms are connected by _________. in a network of SiO2, the atoms are connected by ________. given the structures of pure silicates, they are (good/poor) lubricants and are electrically (conductive/semi-conductive/insulating)

Answer:

well for me I think

Explanation:

Water has higher heat capacity than methane because before heat can break the bond it has to reach a very high temperature

Answer:

water has a lower heat capacity than methane .

Explanation:

b/c methane is gases so higher heat capacity

The sample that the student has is a metal because it has luster.

Metals are those elements that occur towards the left hand side of the periodic table. They have the following properties;

From the few properties listed above, the sample that the student has is a metal because it has luster.

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A lone pair of electrons refers to a pair of electrons that are not involved in any chemical bond and are located on an atom. These electrons are considered "lone" because they are not shared with another atom. Lone pairs are also known as non-bonding electrons or unshared pairs.

Lone pairs play a crucial role in determining the shape, polarity, and reactivity of molecules. They influence the geometry of molecules and can affect the overall polarity of a molecule. Additionally, lone pairs are involved in various chemical reactions, such as Lewis acid-base reactions, where they can be donated or shared with other atoms or molecules.

In the CHO₂⁻ ion, the central atom is the carbon (C) atom. To determine the number of atoms and sets of lone pairs surrounding the central atom, we need to look at the Lewis structure of the ion.

The Lewis structure for CHO₂⁻ can be represented as:

                                          H

                                           |

                                   O = C = O

                                           |

In this structure, the carbon atom (C) is surrounded by three atoms (two oxygen atoms and one hydrogen atom) and one set of lone pairs (from the carbon atom). Therefore, there are three atoms and one set of lone pairs surrounding the central carbon atom in CHO₂⁻.

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The structure of the aromatic product is shown below: \(O=C-N-C_1=CH_2-C_2=C_3C_4=C(OH)C=C_3C=C_2 .\)

Aromatic molecules are a type of organic compound that contain carbon atoms connected by bonds known as double bonds. These molecules possess a distinct odor, or smell, and are known as aromatic compounds. They are often found in essential oils, perfumes, and food flavorings.

The reaction of a benzene ring with a hydroxy group on carbon 1 and an NH₂ on carbon 4 with one equivalent of acetic anhydride (which is an oxygen flanked by two carbonyls each bonded to a methyl group) produces an aromatic product. This product will be an amide, and it will have an oxygen double-bonded to a nitrogen, with the nitrogen also single-bonded to the carbon 4 of the benzene ring. The oxygen will also be single-bonded to the carbon 1 of the benzene ring. The two carbonyl groups of the acetic anhydride will each be single-bonded to a different carbon of the benzene ring.

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Answer:

There is an increase in nuclear charge.

You are on a "merry-go-round" on the top of a 1000 meter tall pole. You are spinning at a velocity of 8 m/s giving you 245,800 Joules of ME. The mass is 0.040 gram.

Velocity is defined as the speed at which an object's position changes in relation to time and a frame of reference. It is a vector quantity.

Mass is defined as the quantity of material that makes up a thing, whereas weight is the force that an object produces.

As we know that

E = m g h

Given

E = 245800 J

g = 9.8 m/s

h = 1000 m

So, m = g h / E

m = 9.8 x 1000 / 245800

m = 0.040 grams

Thus, you are on a "merry-go-round" on the top of a 1000 meter tall pole. You are spinning at a velocity of 8 m/s giving you 245,800 Joules of ME. The mass is 0.040 gram.

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It will take approximately 60 seconds for the concentration of phosphine to go from 0.400 M to 0.100 M.

For a first-order reaction, the rate of reaction is proportional to the concentration of the reactant. The integrated rate law for a first-order reaction is given by:

\(ln(\frac {[A]_t}{[A]_0}) = -kt,\)

where \([A]_t\) is the concentration of the reactant at time t, \([A]_0\) is the initial concentration of the reactant, k is the rate constant, and t is the time.

Given that the time required to go from 1.00 M to 0.250 M is 120 seconds, we can use this information to determine the rate constant (k). Rearranging the integrated rate law, we have:

ln(0.250/1.00) = -k(120 seconds).

Solving this equation for k, we find:

k ≈ -ln(0.250/1.00) / 120 seconds.

Now, to determine the time required for the concentration to go from 0.400 M to 0.100 M, we can rearrange the integrated rate law as follows:

\(ln(\frac {[A]_t}{[A]_0}) = -kt,\)

ln(0.100/0.400) = -kt.

Substituting the value of k we obtained earlier, we have

ln(0.100/0.400) = -(-ln(0.250/1.00) / 120 seconds)t.

Simplifying this equation, we find

\(t \approx -120 seconds \frac {ln(\frac {0.100}{0.400})}{ln(\frac {0.250}{1.00})}.\)

Evaluating this expression, we get

t ≈ 60 seconds.

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In double replacement reactions, two metals not combine with each other when products are formed because, metals form negative ions and like charges attract. Therefore, option A is correct.

A metal is a substance that exhibits a shiny appearance when freshly processed, polished, or shattered, and conducts electricity and heat rather well. Generally speaking, metals are malleable and ductile.

We use the (s) symbol for solid because salt is an insoluble substance that will not dissolve in water. The silver, fluoride, potassium, and chloride ions would have effectively moved to a new location if there had been no precipitate formation, but they would still be floating around as ions. In this instance, nothing happens.

When two ionic compounds exchange ions and create two new ionic compounds, this is known as a double replacement reaction.

Thus, option A is correct.

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Bonds that possess between 5 and 50 ionic character are considered to be polar covalent bonds. Polar covalent bonds occur when two atoms with different electronegativities share electrons unequally.

This results in a partial positive charge on the less electronegative atom and a partial negative charge on the more electronegative atom. The greater the difference in electronegativity between the two atoms, the more polar the bond will be.

When the electronegativity difference is large enough (greater than 1.7), the bond is considered ionic, meaning that one atom has completely lost its electron(s) to the other atom. However, when the electronegativity difference is between 0.5 and 1.7, the bond is considered polar covalent.

In the case of bonds with between 5 and 50 ionic character, the electronegativity difference is not large enough for the bond to be considered fully ionic, but it is significant enough for the bond to be polar covalent. Therefore, bonds with between 5 and 50 ionic character are classified as polar covalent bonds.

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Answer:

coastline

Explanation:

Answer:

coastline

Explanation:

Gas Kinetic Energy Increase

Answer:

The average kinetic energy increases, and the particles collide more frequently.

Explanation:

hotter means more energy & collisions

open bard bing AI

.

On increasing the temperature, the kinetic energy of the molecule will increase which will increase the collision of the particles. So, option (d) is correct.

Kinetic energy is the energy which is possessed by the object due to its motion. It is known as the energy of the motion. Kinetic energy can be transferred between objects and convert to other forms of energy.

As the temperature increases, the kinetic energy of the gas molecules also increases which results in the frequent collision of the particles. The kinetic energy of the gas molecules is higher than that of the solids.

Therefore, the option (4) the average kinetic energy increases, and the particles collide more frequently is correct.

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To find the number of moles of NaOH present in 30.0 mL of 0.140 M NaOH, we can use the formula:

moles of solute = concentration x volume

where "solute" refers to the substance of interest (in this case, NaOH), "concentration" is the molarity of the solution, and "volume" is the volume of the solution in liters.

First, we need to convert the volume of the solution from milliliters to liters:

30.0 mL = 30.0/1000 = 0.030 L

Next, we can substitute the given values into the formula:

moles of NaOH = 0.140 mol/L x 0.030 L = 0.0042 moles

Therefore, there are 0.0042 moles of NaOH present in 30.0 mL of 0.140 M NaOH.

Sir Ramsey's experiment involves the reaction of magnesium with nitrogen gas, and argon gas.

Reaction is a response to an action or stimulus. It is a physical or emotional change that occurs in response to a stimulus, such as a thought, feeling, or external event. Reaction can be both conscious and unconscious, and it can range from mild to severe. Reaction includes both physical and psychological responses, such as laughing, crying, or feeling angry.

In the reaction of magnesium with nitrogen gas, the nitrogen gas is much more reactive than the argon gas. This is because nitrogen gas is able to form a strong bond with magnesium and it is readily oxidized to form nitrite ion, which then reacts with magnesium to form magnesium nitride. On the other hand, argon gas is not reactive enough to form any bond with magnesium and therefore, it does not react with the metal.

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Answer:

85.0

Explanation:

can I get the brainlineast answer??

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, there are 64.4moles of nickel in 3.88 x 10²⁵ atoms of nickel.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample.

Given number of atoms= 3.88 x 10²⁵ atoms

we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number

mole =given number of atoms ÷ 6.022×10²³(Avogadro number)

Substituting the values

mole=3.88 x 10²⁵ ÷ 6.022×10²³

mole =64.4moles of nickel

Therefore, there are 64.4moles of nickel in 3.88 x 10²⁵ atoms of nickel.

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Answer:

Once I read a NASA post where they were saying that the universe keeps expanding as matter keeps forming and cooling down thus adding to the size of the universe so keeping this in mind, the best answer choice is, option A. The universe is currently expanding and will continue to expand.

The hypothesis which is most supported by astronomers is that universe

is currently expanding and will continue to expand.

They are scientists which study  planets, stars, and other celestial bodies.

They have strong beliefs on Big bang theory.

The theory states that the Universe was formed as a result of a big bang in

which one point began to expand . This is why option A is the most

appropriate.

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The concentration of the diluted solution would be 1.90 M. The molarity of the solution can be calculated using the concentration and density of saturated NaOH.

Let's understand this step-by-step:

1. To calculate the concentration of NaOH, you can use the formula for molarity, which is moles of solute per liter of solution.

Molarity = moles of solute / liters of solution

The concentration of saturated NaOH is given as 50.0% w/w. This means 50.0 g of NaOH is present in 100.0 g of solution.

2. Therefore, the mass of NaOH present in 1.000 L of the solution can be calculated as follows:

mass of NaOH = (50.0 g / 100.0 g) x (1.000 L x 1.52 g/mL) = 76.0 g

Now, you need to calculate the moles of NaOH in the solution. The molar mass of NaOH is 40.00 g/mol.

moles of NaOH = mass of NaOH / molar mass of NaOH = 76.0 g / 40.00 g/mol = 1.90 mol

Now that you know the number of moles of NaOH in the solution, you can calculate the molarity.

The volume of the solution is given as 1.000 L, so:

molarity = moles of NaOH / liters of solution = 1.90 mol / 1.000 L = 1.90 M

Therefore, the concentration of the diluted solution would be 1.90 M.

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This means that for every 6 moles of CO2, there are 4 moles of H2O involved in the reaction.

The mole ratio of carbon dioxide (CO2) to water (H2O) can be determined by examining the balanced chemical equation:

2C2H8 + 7O2 -> 4H2O + 6CO2

From the equation, we can see that for every 6 moles of CO2 produced, 4 moles of H2O are also produced. Therefore, the correct mole ratio of carbon dioxide to water is:

6 mol : 4 mol

This means that for every 6 moles of CO2, there are 4 moles of H2O involved in the reaction.

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Answer:

Fluorine has seven electrons in 2p-subshell whereas chlorine has seven electrons in its 3p-subshell. 3p-subshell is relatively larger than 2p-subshell. Therefore, repulsion among the electrons will be more in the 2p-shell of fluorine than 3p-subshell in chlorine.  Due to the smaller size and thus, the greater electron-electron repulsions, fluorine will not accept an incoming electron with the same as chlorine.

Answer:

Hope it'll clear your doubt

Explanation:

example

like in Po4³- one coordinate bond formation occurs coz Phosphorus has valency of 3 and can form 3 bonds when extra electrons on Oxygen atom forms bonds with Phosphorus....those 3 bonds are covalent but.....phosphorus has 5 valence electrons in valence shell so it has already formed 3 bond with Oxygen atoms....now remaining two electrons of P forms coordinate bond with Oxygen

Answer:

the hawk

Explanation:

in order it would be: producer, primary, secondary, tertiary

Answer:

the hawk is the tertiary consumer

The pH values of the solution after the addition of various amounts of acids are as follows:

(a) When 0.0 mL HCl is added; pH = 11.62

(b) After adding 10.0 mL of 0.100 M HCl; pH = 12.38

(c) After adding 30.0 mL of 0.100 M HCl; pH = 14

(d) After adding 40.0 mL of 0.100 M HCl; pH = 2.70

The equation of the reaction between NH₃ and HCl is:

NH₃ + HCl → NH₄Cl

Before the addition of HCl:

The concentration of NH₃ solution = 0.300 M

The initial concentration of OH- can be calculated from the Kb of NH₃ :

Kb = [NH₄⁺][OH⁻] / [NH₃]

1.8 x 10⁻⁵ = x² / 0.300

x = 0.0024 M

The initial concentration of OH⁻ is 0.0024 M, and the initial pH of the solution ill be:

pH = 14 - pOH

pH = 14 - (-log[OH-])

pH = 11.62

(a) When 0.0 mL HCl is added;

pH = 11.62

(b) After adding 10.0 mL of 0.100 M HCl;

moles of HCl added = (0.100 mol/L) x (0.0100 L)

moles of HCl added = 0.00100 mol

The moles of NH₃ initially present = (0.300 mol/L) x (0.0100 L)

moles of NH₃ initially present = 0.00300 mol

the mole ratio of HCl and NH₃ = 1:1

The remaining moles of NH₃ = 0.00300 mol - 0.00100 mol

remaining moles of NH₃ = 0.00200 mol

The volume of the solution is now 10.0 mL + 10.0 mL = 20.0 mL or 0.0200 L.

The new concentration of NH₃ = 0.00200 mol / 0.0200 L

concentration of NH₃ = 0.100 M

The concentration of OH- can be calculated from the Kb of NH₃ using the new concentration of NH4+:

Kb = [NH4+][OH-] / [NH3]

1.8 x 10⁵ = x² / 0.100

x = 0.0042 M

The new concentration of OH- is 0.0042 M, and the new pH will be:

pH = 14 - (-log[OH-])

pH = 12.38

(c) After adding 30.0 mL of 0.100 M HCl;

the volume of the solution is 40.0 mL or 0.0400 L

The moles of HCl added = (0.100 mol/L) x (0.0300 L)

moles of HCl added = 0.00300 mol

moles NH3 reacted = 0.00300 mol - 0.00300 mol

moles NH3 reacted = 0.00000 mol

[NH₄⁺] remaining [OH⁻] = 0

The concentration of OH- is 0 M, so the pH = 14 - (-log[OH-])

pH = 14

(d) After adding 40.0 mL of 0.100 M HCl;

moles HCl = (0.100 mol/L) x (0.0400 L)

moles HCl = 0.00400 mol

The volume of solution = 0.050 L

All NH₃ has reacted and the remaining moles of HCl = (0.00400 mol - 0.00300 mol) / 0.0500 L

the remaining moles of HCl = 0.00200 M

The concentration of H₃O⁺ can be calculated from the concentration of HCl:

0.00200 M HCl produces 0.00200 M H₃O⁺

pH = -log[H₃O⁺]

pH = -log(0.00200)

pH = 2.70

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In the reaction Ba(ClO₃)₂ → BaCl₂ + 3O₂, the valance electrons of Ba will be 2.

The given reaction is Ba(ClO₃)₂ → BaCl₂ + 3O₂

This reaction is a kind of decomposition reaction, barium chlorate breaks down into barium chloride and three moles of oxygen.

Barium possesses two outer shell/valency electrons, as seen by the subscripts of the components in the compound \(BaCl_{2}\). The two chlorine atoms receive two of these outside electrons from it. To comply with the octet rule, any chlorine gets one electron from barium.

Therefore, the valance electrons of Ba will be 2.

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Answer:

c

Explanation:

cause

Answer:

Hail

Explanation:

Answer:

20

Explanation:

The colors of flames in experiments can vary based on several factors, including the temperature and composition of the burning material.

In general, the color of a flame is determined by the emission spectrum of the excited molecules and atoms in the flame. When a material is burned, the heat and energy generated excites the molecules and atoms, causing them to emit light. The specific colors that are emitted depend on the temperature of the flame, as well as the chemical composition of the burning material.

For example, in a very hot flame, such as the flame produced by a welder's torch, the temperature can be high enough to excite and ionize the atoms of the burning material, causing them to emit light across the entire visible spectrum and beyond. This results in a flame that appears white.

In cooler flames, such as those produced by a candle, the temperature is not high enough to ionize the atoms, but it is still high enough to excite them and cause them to emit light. The specific colors that are emitted in this case depend on the chemical composition of the burning material. For example, in a candle flame, the wax is primarily composed of hydrocarbons, which emit a yellow-orange light when burned. The blue color that is often seen in the center of the flame is due to the reaction between the hydrogen and carbon in the wax, which produces excited molecules that emit blue light.

In conclusion, the colors of flames in experiments can vary based on the temperature and composition of the burning material. The specific colors that are observed depend on the conditions within the flame and the chemical reactions that are taking place.

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Hypothesis could be: "The temperature of the water affects the rate of dissolution of potassium nitrate, with higher temperatures leading to faster dissolution and lower temperatures leading to slower dissolution."

This hypothesis is based on the knowledge that temperature affects the solubility of solids in liquids, with higher temperatures generally leading to higher solubility.

In the case of potassium nitrate, it is likely that the colder water during the winter months reduces its solubility, making it take longer to dissolve, while warmer water during the summer months increases its solubility, making it dissolve faster.

To test this hypothesis, one could conduct an experiment in which the same amount of potassium nitrate is added to water at different temperatures (e.g. room temperature, warm water, and cold water) and the time taken for the potassium nitrate to dissolve is measured.

The results of this experiment could be used to either support or refute the hypothesis.

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Answer: The balanced chemical equation for the reaction is:

Mg + 2 HCl → MgCl2 + H2

The molar ratio between MgCl2 and Mg is 1:1, which means that for every 1 mole of Mg that reacts, 1 mole of MgCl2 is produced. Therefore, the number of moles of MgCl2 produced can be calculated by simply using the same number of moles of Mg that reacts.

Given that 2.55 mol of Mg is reacting, the number of moles of MgCl2 produced can be calculated as:

2.55 mol Mg × (1 mol MgCl2/1 mol Mg) = 2.55 mol MgCl2

Now, to convert moles of MgCl2 to grams, we need to multiply the number of moles by the molar mass of MgCl2, which is 95.21 g/mol.

2.55 mol MgCl2 × 95.21 g/mol = 242.89 g MgCl2

Therefore, 2.55 mol of Mg will produce 242.89 g of MgCl2.

Explanation:

Answer:

Most oxidation-reduction (redox) processes involve the transfer of oxygen atoms, hydrogen atoms, or electrons, with all three processes sharing two important characteristics: (1) they are coupled—i.e., in any oxidation reaction a reciprocal reduction occurs, and (2) they involve a characteristic net chemical change— .

Electrons will be transferred during redox reaction.

The electron is subatomic particles which are placed in surrounding the nucleus. Electrons carry negative charge.

Redox reaction involve the transfer of electrons between intermediates. A redox reaction occurs when the oxidation states of the substrate change. The removal of electrons or even a rise in the oxidation state of such a chemical or its atoms is referred to as oxidation. The acquisition of electrons or a lowering in the oxidation number of a chemical or the atoms inside it is referred to as reduction.

Hence the answer will be electron

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Answer:

in the explanation is my answer

Explanation:

Chemical Energy

Chemical Energy is energy stored in the bonds of atoms and molecules. Batteries, biomass, petroleum, natural gas, and coal are examples of stored chemical energy. Chemical energy is converted to thermal energy when we burn wood in a fireplace or burn gasoline in a car's engine.