URGENT PLEASE HELP NOW!!
When do most ionic bonds form, based on this Periodic Table?


when elements from B bond with themselves

when elements from A bond with elements from B

when elements from C bond with elements from D

when elements from A bond with themselves

Answer:

the oil spreads to cover the water

Answer:

I think it is ; The oil floats to the surface of the water

Explanation:

I don't know about the other one.

Answer:

The scale reads the tension in the string. The tension in the string is 100 N. This is the force the string must exert up on either of the 100-N weights at either end of the string.

Nothing is moving, nothing is accelerating, so the net force on the spring is zero. Likewise, the net force on either of the 100-N weights is also zero. But that is another question. The spring scale does not measure the net force. The spring scale simply measures the tension, the magnitude of the force exerted by the string.

Explanation:

Answer:

7.6410^-14 grams N2O4

Explanation:

I will assume that "contains a billion (1.00 × 10º)" is meant to read "(contains a billion (1.00 × 10^9)."

One mole of anything contain 6.02x10^23 particles of that thing (atoms, molecules, paper clips, suns, etc.).  If there are 1.00x10^9 particles of N2O4, we have:

(1.00x10^9 particles N)/(6.02x10^23 particles/mole) = 1.66x10^-15 mole of N atoms

Each mole of N2O4 contains 2 moles of N atoms:  

(1 mole N2O4)/(2 moles N atoms)

(1.66x10^-15 mole of N atoms)*(1 mole N2O4)/(2 moles N atoms) =

8.31x10^-16 moles N2O4

The molar mass of N2O4 is 92.01 g/mole.

(8.31x10^-16 moles N2O4)*(92.01 g/mole) = 7.6410^-14 grams N2O4

True. The element in period 3 that can be used in making computer chips is silicon. because it is a metalloid.

Metalloids have the have properties intermediate of metals and nonmetals. metals give electrons while nonmetals receive. metalloids do neither and rather decides to share. Metals conduct electricity  nonmetals don't while metalloids conduct electricity sparsely. Metals form basic oxides, non metals acidic oxides while metalloids amphoteric or slightly acidic oxides. Metalloids also display typical nonmetal properties like brittleness. Metalloids can also form alloys. The metalloids silicon (Si) is the elements found along the step like line between metals and non-metals of the periodic table and used in making computer chips. It consist of properties from both metals and non-metals.

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Answer:

um..... okay I'll give it a shot

a) A control variable would be the same species of the rat that were used in the entire experiment.

b) A control group is the group of rat that do not have lymphoma.

What is control variable?

The control variable is a group which is unchanged or constant throughout the experiment. They may include temperature, humidity, pressure, experimental techniques, sample volume etc.

In an experiment control variable is the variable which must be kept constant throughout the experiment to keep the outcome of the experiment unaltered. The control group is the one that don't receive the treatment while being tested in an experiment.

Therefore, a control variable would be the same species of the rat used in the entire experiment and control variables are the one which do not have a lymphoma.

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When Ba(NO3)2 is added to the mixture, it will not affect the given equilibrium process since it does not directly interact with any of the reactants or products involved. Therefore, there will be no shift in equilibrium.

Ba(NO3)2 is a soluble salt that dissociates into Ba2+ and NO3- ions in aqueous solution. When Ba(NO3)2 is added to the mixture, the addition of Ba2+ ions will have an effect on the equilibrium position of the reaction. Specifically, Ba2+ ions can react with the OH- ions to form a precipitate of Ba(OH)2, which will remove OH- ions from the solution. This removal of OH- ions will cause the equilibrium to shift to the right, towards the product side. Therefore, the prediction for the shift in equilibrium when Ba(NO3)2 is added to the mixture is "towards product".

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Answer:

We can use the formula for exponential decay to solve this problem:

N(t) = N₀ * (1/2)^(t/T)

where:

N(t) is the amount of radioactive substance remaining after time t

N₀ is the initial amount of radioactive substance

T is the half-life of the substance

We know that T = 5730 years, N(t) = 2 grams, and t = 1000 years. We want to find N₀.

2 = N₀ * (1/2)^(1000/5730)

2/N₀ = (1/2)^(1000/5730)

log(2/N₀) = (1000/5730) * log(1/2)

log(2/N₀) = -0.000120968 * log(2)

Now we can solve for N₀ by taking the antilogarithm of both sides:

2/N₀ = 1/2^0.000120968

N₀ = 2 / (1/2^0.000120968)

N₀ ≈ 3.99 grams

a) DH^ r x n=-1∅7 k/ m o l
b) As DH is negative so it is exothermic.
c) it proceeds spontaneous in forward direction.




A)     ch3                                                                   ch3

         |                                                                           |

CH3-C-CH3     +Br^2                                       .CH3-C-CH3                    
         |                                                                           |
        H                                                                         Br

                                                                                   +H-BR.

DH^ r x n=Σ Bonds^ broken-Bonds^ formed      
=DH(C-H)+DH(Br-Br)
=-DH(C-Br)+DH(H-Br)
=263+192-(366+276)
DH^ r x n= 455-642            
DH^ r x n=-1∅7 k/ m o l


b) As DH is negative so it is exothermic.
c) it proceeds spontaneous in forward direction.    

The liquid/gas phase change, like the solid/liquid phase change, requires energy. The enthalpy of vaporization (or heat of vaporization) is the amount of energy required to convert a liquid to a gas,
denoted as H  v a p.  

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The enthalpy of the reaction as written is approximately 239,306 J/mol.

To calculate the enthalpy of the reaction, we need to use the heat released (2330 J) and the amount of sodium reacted (0.224 g) to determine the heat released per mole of sodium reacted.

The molar mass of sodium (Na) is 22.99 g/mol.

First, we need to calculate the number of moles of sodium reacted:

Number of moles of Na = Mass of Na / Molar mass of Na

Number of moles of Na = 0.224 g / 22.99 g/mol ≈ 0.00974 mol

Next, we can calculate the enthalpy change (ΔH) per mole of sodium reacted:

ΔH = Heat released / Number of moles of Na

ΔH = 2330 J / 0.00974 mol ≈ 239306 J/mol

Enthalpy (H) is a thermodynamic property that represents the total heat content of a system at constant pressure. It includes the internal energy of the system plus the product of pressure and volume. Enthalpy is often used to describe heat changes in chemical reactions, where the difference in enthalpy between the reactants and products determines whether a reaction is exothermic (releases heat) or endothermic (absorbs heat). Enthalpy is typically measured in joules (J) or kilojoules (kJ).

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Answer:

God's power is not reflected here.

Answer:

One

Explanation:

In a hydrogen atom, the first outer shell only consists of two valence electrons, because it would already have one, the atom only needs one more.

It requires two electrons to completely occupy its outer shell, it frequently forms a single covalent bond with another atom. Because of this configuration, hydrogen can gain access to two electrons and completely occupy its valence shell.

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In the Lewis structure of methanol (CH3OH), the OH group is placed on the outside because it is an important functional group that influences the chemical properties and reactivity of the molecule.

The Lewis structure is a representation of a molecule that shows the arrangement of atoms and valence electrons. In methanol, carbon (C) is the central atom bonded to three hydrogen (H) atoms and one oxygen (O) atom. The oxygen atom forms a single bond with carbon and also has two lone pairs of electrons.

The placement of the OH group (hydroxyl group) on the outside of the Lewis structure is significant because it determines the chemical behavior of methanol. The OH group consists of an oxygen atom bonded to a hydrogen atom and represents the presence of an alcohol functional group.

In organic chemistry, functional groups are specific arrangements of atoms within a molecule that give rise to characteristic chemical reactions and properties. The presence and position of functional groups can greatly influence the behavior and reactivity of a compound. In the case of methanol, the hydroxyl group provides the molecule with its characteristic properties.

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Answer: Cobalt

Explanation:

Lead and gold aren't magnetic

1. a. 3

b. 2

2. a. 4

b. 6

3. a. 1

b. 2

4. a. 5

When any chemical equation is not balanced then that is known as skeletal chemical equation. We need to balance it because as we know that mass can neither be created nor be distroyed and also the number of atoms on the reactant side should always be equal to the compounds on the product side .

Answer:

C

Explanation:

Hydrogen peroxide is H2O2 which decomposes to water and oxygen

so

2H2O2 => 2H2O + O2

Explanation:

Touching or tasting these unknown substances could be lethal or cause severe burns to your skin, so it is advisable to use other methods to identify substances.

Answer:Cutting, tearing, shattering, grinding, and mixing are further types of physical changes because they change the form but not the composition of a material. For example, mixing salt and pepper creates a new substance without changing the chemical makeup of either component.

Explanation:

The bond that exists between two oxygen atoms to make the O2 molecule is described as two covalent bonds and two lone pairs of electrons are present on each individual oxygen atom.

A double bond in chemistry is a covalent bond between two atoms that involves four bonding electrons, rather than two as in a single bond.

In the oxygen molecule, O2, the oxygen atoms that make up the molecule are bonded together by sharing two pairs of electrons. Each oxygen atom has 6 valence electrons, if they share two of their valence electrons with each other, they each have 8 valence electrons.

In this way, the so-called octet rule is fulfilled, where atoms gain, lose or share electrons with other atoms to have 8 valence electrons and thus acquire a noble gas configuration.

The atom is the smallest part of the composition of matter, it is indivisible and is composed of a nucleus that has protons and neutrons, and around the nucleus there are the electrons.

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Answer:

it will be a gas because anything hotter than boiling would be a gas

Answer:

Ionic bond is the intermediate in strength.

Explanation:

Ionic bond is weaker than covalent bond and stronger than hydrogen bond in strength because in ionic bond, the atoms attract each other due to opposite in charge. Ionic bond is a type of bond in which one atom losses electron completely and become cation (positive charge) while the other atom receive the electron and become anion (negative charge). so they attract each other due to opposite charges.

The B: oxygen in O2 is oxidized in the given redox reaction. In a redox reaction, oxidation is the loss of electrons, while reduction is the gain of electrons. In the given reaction, oxygen gains electrons from sulfur, which means oxygen undergoes reduction. At the same time, sulfur loses electrons to oxygen, which means sulfur undergoes oxidation. Therefore, the element that is oxidized in this reaction is sulfur.

To describe the answer more accurately, it should be noted that the question is asking about which element is oxidized, not which compound or molecule. The reactants in the reaction are 2 molecules of H2S and 1 molecule of O2, and the products are 2 molecules of H2O and 1 molecule of S. It is the oxygen in O2 that is oxidized, as it gains electrons during the reaction.

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Answer:

N, P, As, Sb

Explanation:

Elements present in the same group having same number of valence electrons. The first option is correct from given options because nitrogen, phosphorus, arsenic and antimony are present in same group thus having same number of electrons in outer most  energy level.

Electronic configuration of N:

N₇: [He] 2s² 2p³

Electronic configuration of P:

P₁₅: [Ne] 3s² 3p³

Electronic configuration As:

As₃₃: [Ar] 3d¹⁰ 4s² 4p³

Electronic configuration Sb:

Sb₅₁: [Kr] 4d¹⁰ 5s² 5p³

Here it is clear from electronic configuration all these elements have five number of valence electrons.

Answer:

La comida es un sólido y no podemos vivir sin comida. Algunos sólidos son buenos conductores de calor y electricidad; otros son aislantes. Los sólidos se utilizan todos los días en la vida.

The standard reduction potential (e) for the half-reaction Al³⁺(aq) + 3e⁻ → Al(s) is -1.68 V.

The standard reduction potential (e) represents the tendency of a species to gain electrons and undergo reduction. It is measured in volts (V). To determine the standard reduction potential for the given half-reaction, we need to consult a table or reference that lists the standard reduction potentials.

The standard reduction potential for the reduction of Al³⁺(aq) to Al(s) can be found in standard electrochemical tables. The value for this half-reaction is -1.68 V. The negative sign indicates that the reduction process is spontaneous and favorable. It means that Al³⁺ ions have a higher tendency to gain electrons and form solid Al compared to the standard hydrogen electrode (which has a standard reduction potential of 0 V).

Therefore, the correct answer is option c: -1.68 V.

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Answer:

Explanation:

According to legend, Galileo dropped weights off of the Leaning Tower of Pisa, showing that gravity causes objects of different masses to fall with the same acceleration. In recent years, researchers have taken to replicating this test in a way that the Italian scientist probably never envisioned — by dropping atoms. One of Galileo's contributions to the founding of modern science was his study of falling objects.  He turned, then, to measuring the acceleration of objects rolling down smooth ramps. The ramp "diluted" the acceleration to a value small enough to allow accurate measurements of the longer time intervals.

Answer:

If this is for the "functional groups" question:

1. aldehyde

2. ketone

3. ester

4. carboxylic acid

Explanation:

Got them all right on edge.

The drop-down menus to identify the names of the structures in the table to the right

1. Aldehyde

2. Ketone

3. Ester

4. Carboxylic acid

A functional group in organic chemistry is a pool of atoms within molecules which bind jointly to react in predicted ways.

Examples of functional groups contain the group hydroxyl, ketone, amine, and ether.

Thus, these are the drop down menus.

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