A change in the internal energy of a system at constant pressure from a chemical reaction will result in an identical change in the -​

Answer:

I think 11.1 degrees Celsuis

Explanation:

Let me know if i'm right coz im not too sure.

Answer: The balanced nuclear equation for the alpha decay of Sr-90 is [tex]_{38}^{90}\textrm{Sr}\rightarrow _{36}^{86}\textrm{Kr}+_2^4\alpha[/tex]

Explanation:

A nuclear reaction is defined as the reaction in which the changes in the nucleus of an atom take place and usually form a different element. The types of decay processes are:

Alpha decay is the process in which a heavy nucleus decays into a light nucleus with the release of an alpha particle. This alpha particle carries a charge of +2 units and has a mass of 4 units. It is also known as the helium nucleus. The general equation for this decay process is:

[tex]X_Z^A\rightarrow Y_{Z-2}^{A-4}+\alpha _2^4[/tex]

The nuclear equation for the alpha decay of strontium-90 isotope follows:

[tex]_{38}^{90}\textrm{Sr}\rightarrow _{36}^{86}\textrm{Kr}+_2^4\alpha[/tex]

Answer:

molar mass

Explanation:

water is to gas as liquid is to solid

ahí esta la respuesta espero que te sirva

Answer:

(2) Ammonia I hope you good luck

(1) aluminum

Let's look at all the options first:

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Answer:

28.16 g/mol

Explanation:

From Graham's law;

Let the rate of diffusion of gas X be 1.25

Let the rate of diffusion of CO2 be 1

Molecular mass of gas X= M

Molecular mass of CO2 = 44g/mol

1.25/1=√44/M

(1.25/1)^2 = 44/M

1.5625 = 44/M

M= 44/1.5625

M= 28.16 g/mol

Answer:

A.A gas exerts pressure on the walls of the container. Reason: They have high kinetic energy and negligible force of attraction to move constantly moving with high speed in all directions. ... These collisions of the gas particles with the container walls exert pressure on the walls of the container.

B A gas exerts pressure on the walls of the container due to imapact of its gas molecules with hight velocity .

C.A wooden table should be called a solid. Reason: It has a definite shape and volume. It is very rigid and cannot be compressed, i.e., it has a solid characteristic.

D.We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert. It is because the molecules of air has less force of attraction between them and a very small external force can separate them and pass through it.

Explanation:

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Answer:

The phosphorus first reacts with the bromine or iodine to give the phosphorus(III) halide. These then react with the alcohol to give the corresponding halogenoalkane, which can be distilled off

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Answer:

The value of N would be 4.

Explanation:

The equation would be 2n^x = 32 and therefore, 4.

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Answer:

Is there a picture for it

Explanation:

because it would be a hard

Answer: 18 moles of [tex]H_2O[/tex] will be produced.

Explanation:

We are given:

Moles of ammonia = 12 moles

The given chemical equation follows:

[tex]4NH_3+5O_2\rightarrow 4NO+6H_2O[/tex]

By the stoichiometry of the reaction:

4 moles of ammonia produces 6 moles of water

So, 12 moles of ammonia will produce = [tex]\frac{6}{4}\times 12=18mol[/tex] of water

Hence, 18 moles of [tex]H_2O[/tex] will be produced.

Answer:

Intermolecular bonds become weaker

Melting

Temperature increases

Molecules vibrate faster

Explanation:

In the solid phase, intermolecular forces are found to be strongest. However, as the temperature is increased, the molecules of the solid begin to vibrate faster and intermolecular forces between them begin to weaken.

As intermolecular forces of a substance become weaker, the substance melts. The molecules in the liquid state possesses greater kinetic energy than the molecules in the solid state.

Hence the the answer above.

Answer:

B, C, F, and H

Explanation:

These are all things that happen in the increase of the kinetic energy of particles in a solid.

B. Intermolecular bonds become weaker

C. Melting

F. Temperature increases

H. Molecules vibrate faster

Also, just took the test and got it right.

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Answer:

alloy,copper,gold, silver,cobalt

Explanation:

Answer:

pen??????l think l m not sure

Answer:

B) Regeneration

the action or process of regenerating or being regenerated, in particular the formation of new animal or plant tissue.

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A sea star has one of its arms break off. That arm grows into its own separate organism through [tex]\sf\purple{regeneration}[/tex].

b. regeneration ✅

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Answer: The chemical symbol of the compound formed is [tex]XCl[/tex] or [tex]NaCl[/tex]

Explanation:

An ionic compound is formed when the complete transfer of electrons takes place from one element (usually metals) to another element (usually non-metals).

The element losing electron (metal) forms a positive ion known as a cation while the element gaining electron (non-metal) forms a negative ion known as an anion.

Element X has the atomic number 11 which is sodium. The electronic configuration of it is [tex]1s^22s^22p^63s^1[/tex]

This element will lose 1 electron to form [tex]X^+[/tex] ion of [tex]Na^+[/tex]

Chlorine has the atomic number 17. The electronic configuration of it is [tex]1s^22s^22p^63s^23p^5[/tex]

This element will gain 1 electron to form [tex]Cl^-[/tex] ion

When these two ions combine, they lead to the formation of an ionic compound having a chemical formula of [tex]XCl[/tex] or [tex]NaCl[/tex]

Hence, the chemical symbol of the compound formed is [tex]XCl[/tex] or [tex]NaCl[/tex]

Answer: The correct answer is heat will flow from the boiling water into the frozen metal.

Explanation:

According to the law of conservation of energy, energy cannot be destroyed nor created but it can be transformed from 1 form to another form.

There are 3 processes of heat transfer:

The heat moves from a hot surface to a cold surface to maintain equilibrium.

We are given:

A metal is placed in a freezer (cold object) and another metal is placed in an oven (hot object) and then both the metals are placed in boiling water.

Initially, the heat will flow from the boiling water (hot object) into the frozen metal (cold object) to maintain equilibrium

Hence, the correct answer is heat will flow from the boiling water into the frozen metal.

Answer: The correct options are A, C and D.

Explanation:

Enthalpy of formation is defined as the change in the enthalpy when 1 mole of a chemical substance is formed from its pure element at standard conditions. It is represented by the symbol [tex]\Delta H_{f}[/tex]

Enthalpy of formation for elemental atoms is always equal to 0.

We know:

Bromine (Br) exists in a liquid state.

Helium (He) exists in a gaseous state.

Mercury (Hg) exists in a liquid state.

Chlorine (Cl) exists in a gaseous state.

Nitrogen (N) exists in a gaseous state.

For the given options:

The [tex]\Delta H_{f}[/tex] for [tex]Br_2(l), Hg(l)\text{ and }Cl_2(g)[/tex] will be equal to 0 because they are formed by the natural states of their elemental atoms.

Hence, the correct options are A, C and D.

A substance in its standard state has an enthalpy of formation of 0 kJ/mol.

The enthalpy of formation of a substance in its standard state is 0 kJ/mol.

The standard state of a substance refers to its state at 1 atm and at a temperature of 298 K. Bearing this in mind, we can now identify the true and false statements.

So,

ΔHf for Br2(I) is 0 kJ/mol - True

ΔHf for He(I) is 0 kJ/mol - False

ΔHf for Hg(I) is 0 kJ/mol - True

ΔHf for Cl2(g) is 0 kJ/mol - True

ΔHf for  N2(I) is 0 kJ/mol - False

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Answer: The correct net ionic equation for the reaction is [tex]2H^{+}(aq)+2OH^{-}(aq)\rightarrow 2H_2O(l)[/tex]

Explanation:

Net ionic equation is defined as the equations in which spectator ions are not included.

Spectator ions are the ones that are present equally on the reactant and product sides. They do not participate in the reaction.  

The balanced molecular equation is:

[tex]Ca(OH)_2(aq)+H_2SO_4(aq)\rightarrow CaSO_4(aq)+2H_2O(l)[/tex]

The complete ionic equation follows:

[tex]Ca^{2+}(aq)+2OH^-(aq)+2H^+(aq)+SO_4^{2-}(aq)\rightarrow 2Ca^{2+}(aq)+SO_4^{2-}(aq)+H_2O(l)[/tex]

As calcium and sulfate ions are present on both sides of the reaction. Thus, they are considered spectator ions.

The net ionic equation follows:

[tex]2H^{+}(aq)+2OH^{-}(aq)\rightarrow 2H_2O(l)[/tex]

Hence, the correct net ionic equation for the reaction is [tex]2H^{+}(aq)+2OH^{-}(aq)\rightarrow 2H_2O(l)[/tex]

Answer:

B. no reaction     

Explanation:

Answer:

d sguro

Explanation:

I'm not sure kung ayan ba

Answer:

might help

Explanation:

Answer:

A

Explanation:

Alkanes undergo substitution reaction with halogen molecules in the presence of light. This reaction occurs by free radical mechanism and the initiation step is the formation of the halogen radical.

The propagation steps involves the abstraction of a hydrogen from the alkane by the halogen radicals.

The termination steps involves the coupling of alky radicals.

Thus for the reaction of ethane and chlorine;

C2H6 + Cl2 -------> C2H5Cl + HCl

Answer:

Most likely burning coal produces silver dioxide with can cause acid rain

Explanation:

Only one answer comes with a negative consequence. All the others are either

1. Explaining the benefits of coal, such as it producing more heat

2. Stating that there is more coal than any other natural resource

3. Coal being more convenient

Answer:

[tex]1 \: mole \: of \: sulphurdioxide \: weighs \: 64 \: g \\ 0.850 \: moles \: will \: weigh \: (0.850 \times 64) \: g \\ = 544 \: g[/tex]

The mass of 0.85 mol of sulfur dioxide has been 54.4 grams.

Moles can be calculated as the ratio of the mass to the compound to the molecular mass. The moles can be expressed as:

Moles = [tex]\rm \dfrac{mass}{molecular\;mass}[/tex]

Mass = moles [tex]\times[/tex] molecular mass

The molecular mass of sulfur dioxide = Mass of sulfur + 2 [tex]\times[/tex] mass of oxygen

= 32 + 2 [tex]\times[/tex] 16

= 32 + 32

= 64 g/mol

The given moles of sulfur dioxide = 0.850 mol

The mass of sulfur dioxide = 0.850 [tex]\times[/tex] 64

The mass of sulfur dioxide = 54.4 grams.

The mass of 0.85 mol of sulfur dioxide has been 54.4 grams.

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