What is an element?

a. A substance that is made of water.
b. A substance made of only one type of atom.
c. A substance that is made of no atoms.
d. A substance made of more than one type of atom.

Final answer:

Ninety-two different atoms occur naturally on Earth, and these are detailed in the Periodic Table of Elements. Atoms are distinguished by the number of protons in their nucleus, while isotopes of these elements differ by their neutron count. Evidence of atoms includes the periodic table's structure and Brownian motion.

Explanation:

There are 92 different kinds of atoms that occur naturally on Earth. These are the building blocks of all matter and are listed in the Periodic Table of the Elements. Each atom type, or element, has a unique number of protons in its nucleus, which also dictates the number of electrons that orbit the nucleus.

When considering the number of neutrons, atoms of the same element can have different numbers, leading to various isotopes. For instance, while 99% of carbon atoms on Earth have 6 neutrons, about 1% have 7 neutrons. Thus, what we see in nature is actually a mixture of isotopes, with most elements having at least one stable isotope.

Despite the ancients believing in only four types of atoms (earth, water, air, and fire), we now understand there are many more, with distinct properties such as atomic weight, size, and structure. We can't observe atoms with visible light due to their incredibly small size, which is below the wavelength of light that our eyes can detect. However, we have evidence of their existence, such as the patterns in the periodic table and the phenomenon of Brownian motion.

Answer:

The average kinetic energy of the particles in a gas is proportional to the temperature of the gas.

Explanation:

Because the mass of these particles is constant, the particles must move faster as the gas becomes warmer.

The Relationship between the kinetic energy and temperature of a gas is : Kinetic energy of a gas is directly proportional to the temperature (K∝T)

Kinetic energy is the energy contained by a particle by the reason of it motion.

temperature can be said be the degree of hottness or degree of coldness of a particle.

Because the particles of has have a negligible force when they are heated they become excited and move about randomly. so the more the heat the faster they move.

we can conclude by saying that the Kinetic energy of a gas is directly proportional to the temperature (K∝T).

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Answer : The number of moles of helium are, 0.329 mol.

Explanation :

To calculate the moles of helium gas we are using ideal gas equation.

[tex]PV=nRT[/tex]

where,

P = Pressure of [tex]He[/tex] gas = 92.3 kPa = 0.911 atm

V = Volume of [tex]He[/tex] gas = 8.5 L

n = number of moles [tex]He[/tex] = ?

R = Gas constant = [tex]0.0821L.atm/mol.K[/tex]

T = Temperature of [tex]He[/tex] gas = 287 K

Now put all the given values in above equation, we get:

[tex]0.911atm\times 8.5L=n\times (0.0821L.atm/mol.K)\times 287K[/tex]

[tex]n=0.329mol[/tex]

Thereofore, the number of moles of helium are, 0.329 mol.

Answer:

1:  tap water to ice cube

2:  electric burner to pot

Next section

1:  bonfire to air

2:  hand to ice

Next section

1:  Molecules in the hot water bottle are moving faster than molecules in the skin

2:  Molecules in the skin are moving faster than molecules in the glass

Next section

Collisions result in transfer of energy from molecules of higher kinetic energy to molecules of lower kinetic energy

Warm water molecules slow down while cold water molecules speed up

Explanation:

on edg Good Luck!!

Answer:

Does it form solution?

If yes, then B.) deliquescent

If no, then C.) hygroscopic

Explanation:

When a substance is exposed to air, it either gives off or absorbs water (moisture) from the air. These phenomenons are explained in Efflorescence, Hygroscopy, and Deliquescence

Hygroscopic and deliquescent materials are both able to absorb moisture from the air. But while hygroscopic materials (e.g NaCl, silica gel) absorb moisture and become damp and sticky, deliquescent materials (e.g. CaCl2 and solid NaOH) dissolves in water absorbed from the air and liquefy.

Answer:

[tex]Al^{3+} + 3OH^{-} ---> Al(OH)_{3}[/tex]

Explanation:

AlCl3 + 3NaOH ---> Al(OH)3 + 3NaCl

[tex]Al^{3+} +3Cl^{-} +3Na^{+}+3OH^{-}--->AL(OH)_{3}+3Na^{+}+3OH^{-}\\\\Al^{3+} + 3OH^{-} ---> Al(OH)_{3}[/tex]

The balanced NET ionic equation for the reaction when AlCl₃ and NaOH are mixed in an aqueous solution is:

Al³⁺(aq) + 3OH⁻(aq) → Al(OH)₃(s)

The reaction between AlCl₃ and NaOH is an exchange reaction:

AlCl₃(aq) + 3NaOH(aq) → Al(OH)₃(s) + 3NaCl(aq)   (1)

In this reaction, the ions Cl⁻ and OH⁻ are exchanged between the ions Al⁺³ and Na⁺.  

To write the NET ionic equation, we need to write the total ionic equation:

Al³⁺(aq) + 3Cl⁻(aq) + 3Na⁺(aq) + 3OH⁻(aq) → Al(OH)₃(s) + 3Na⁺(aq) + 3Cl⁻(aq)   (2)

Since the Al(OH)₃ precipitates, we cannot write it as an ion because it does not dissociate in the aqueous solution.  

The net ionic equation of reaction (2) is the following:

Al³⁺(aq) + 3OH⁻(aq) → Al(OH)₃(s)   (3)

All repeated ions in reactants and products do not participate in the net ionic equation. That is why we canceled the Na⁺ and Cl⁻ ions in the net ionic equation (eq 3).

Therefore, the balanced net ionic equation is:

Al³⁺(aq) + 3OH⁻(aq) → Al(OH)₃(s)

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Answer:

kinetic energy.

Explanation:

an object in motion collides with another object to make that object in motion.

kinetic energy is the energy of an object being in motion.

Answer:

K+ and Br-

Explanation:

The diagram below shows the movement of particles. This piece of evidence is best supported by :

the collision theory

Explanation:

Answer: a

Explanation:

edge

Answer:

D

Explanation:

If you add two or more thermochemical equations to give a final equation, then you also add the heats of reaction to give the final heat of reaction

Answer:

It's C (combined wave)

Explanation:

Answer:

limiting reactant

Explanation:

The term that will be used to describe zinc in this case is limiting reactant.

A limiting reactant is a reactant that determines the amount of product formed in a chemical reaction. They are often stoichiometrically smaller of all the reactants in a reaction and once they are used up during, the reaction stops.

In this case, the zinc metal in the reaction is completely consumed, making the hydrochloric acid to be in excess. The zinc thus determines the amount of the products formed,

Answer:

Solute

       Solvent

   Solute

   Solvent

  Solvent

Explanation:

Answer:

1) Solute

2) Solvent

3)Solute

4)Solvent

5)Solvent

Explanation:

Answer:

7700000000

Explanation:

so 7.7 x 10 to the power of 9 is in standard form

to put it into a number you just need to times it by 1000000000

however your answer will only have 8 zeros because of the decimal point

Answer:

c

Explanation:

Answer:

.1648 cal/g•°C

Explanation:

The amount of heat lost when solid Al cools from 660.0 oC to 25.0 oC is approximately 2,389,101.17 J.

To calculate the heat lost, you can use the heat transfer equation: Q = mcΔT, where Q is the heat lost, m is the mass of the object, c is the specific heat capacity of the substance, and ΔT is the change in temperature. In this case, the mass of aluminum (Al) is given as 4110 g and the specific heat of Al is given as 0.902 J/g x oC.

First, calculate the change in temperature: ΔT = T_final - T_initial = 25.0 oC - 660.0 oC = -635.0 oC.

Next, plug the values into the formula: Q = (4110 g)(0.902 J/g x oC)(-635.0 oC) = -2,389,101.17 J.

Therefore, approximately 2,389,101.17 J of heat is lost when solid Al cools from 660.0 oC to 25.0 oC.

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Answer:

No it does not, plateaus are very elevated

Answer: 2

Explanation:

The coefficient that should appear in front of LiNO₃ in the balanced equation is 2, to ensure that the number of nitrate ions is conserved between the reactants and the products.

The unbalanced chemical reaction provided is Pb(NO₃)₂ (aq) + Li₂SO₄ (aq) →PbSO₄ (s) +  LiNO₃ (aq).. To balance this equation, we must ensure that the number of each type of atom or polyatomic ion on the reactant side equals the number on the product side.

Let's start by looking at the lead (Pb) atoms. There is one Pb atom on the reactant side and also one on the product side, so Pb is balanced. Next, we notice that there are two nitrate (NO₃) ions on the reactant side within the Pb(NO₃)₂ compound. On the product side, each LiNO₃ contains one nitrate ion, so we need two LiNO₃ molecules to balance the nitrate ions. So, the coefficient in front of LiNO₃ should be 2.

Therefore, the balanced equation would be Pb(NO₃)₂ (aq) + Li₂SO₄ (aq) →PbSO₄ (s) + 2 LiNO₃ (aq).

Answer:

KE = 110 J

Explanation:

I think this is right. I tried. sorry if its wrong!!!!

Explanation:

K.E=M×V^2

=55×4

=220J

This is the kinetic energy of the girl.

Answer:

-1,839.6

Explanation:

The enthalpy of the reaction between Manganese dioxide and aluminum to produce aluminum oxide and manganese is -1,839.6 kJ, calculated using the formula for ΔH reaction incorporating the enthalpies of formation of the reactants and products.

The enthalpy of the reaction for Manganese dioxide and aluminum to produce aluminum oxide and manganese can be calculated using the formula ΔHrxn = Σ ΔHf products - Σ ΔHf reactants. Here, the ΔHf for MnO2 is -520.0 kJ and for Al2O3 is -1699.8 kJ/mol. The balanced reaction involves 3 moles of MnO2 and 2 moles of Al2O3, so applying this to our equation: ΔHrxn = [2(-1699.8 kJ) + 3(0 kJ)] - [3(-520.0 kJ) + 4(0 kJ)], because the formation of a pure element in its standard state, like solid Mn, is zero. Hence, the ΔHrxn calculates to be -1,839.6 kJ.

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Answer:

548.089  J

Explanation:

-The molar mass of copper is 63.546 grams.

-We obtained the mass of 0.762 moles of copper:

[tex]mass =moles\times molar\ mass\\\\\\=0.762\times 63.546\\\\=48.422\ g[/tex]

-We apply the specific heat formula to calculate the amount of heat released:

[tex]q=mC\bigtriangleup T\\\\\\=48.422\ g\times 0.385 \ J/g\textdegree C\times (81.6-52.2)\textdegree C\\\\\\=548.089 J[/tex]

Hence, the amount of heat released is 548.089  J

The heat released when 0.762 mol of copper cools from 81.6°C to 52.2°C can be calculated using the formula q = mcΔT where q is the heat transferred, m is the mass, c is the specific heat capacity and ΔT is the temperature change. The calculated heat released is approximately -548.07 Joules.

To calculate the heat released when 0.762 mol of the copper cools from 81.6°C to 52.2°C, we need to first know the specific heat capacity of copper, which is 0.385 J/g°C.

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Answer:

the generator

Explanation:

Answer:

399.88

Explanation:

The molar mass is just the number of total mass of each atom of each element.

2 - Fe = (55.845 x 2) = 111.69

3 - S = (32.06 x 3) = 96.18

12 - O = (15.999 x 12) = 191.988

For oxygen, it's being added 12 times because there is 4 in the compound times the 3 on the outside.

Now, add all of them and you have your answer!

The molar mass of

I) sulfate, is calculated by adding up the molar masses of its individual atoms. It has 2 atoms of iron, 3 molecules of sulfate (each containing 1 sulfur atom and 4 oxygen atoms). This adds up to approximately 400.01 g/mol.

To calculate the molar mass of

own as iron(III) sulfate, you should add up the molar masses of all the atoms in the formula. Iron ('Fe') has a molar mass of about 55.85 g/mol. Sulfur ('S') has a molar mass of about 32.07 g/mol, and oxygen ('O') has a molar mass of about 16.00 g/mol. The compound has 2 atoms of iron, 3 molecules of sulfate (each containing 1 sulfur atom and 4 oxygen atoms).

Calculating these gives:

So the molar mass of Fe2(SO4)3 is approximately 400.01 g/mol.

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Answer:

hydrogen,Acids

Explanation:

Hope this helps you

Answer: (C) NH3(g)-- NH3(aq)

Explanation:

The system at equilibrium will shift to the right when the pressure is increased is NH₃(g) = NH₃(aq) and the correct option is option C.

Chemical equilibrium refers to the state of a system in which the concentration of the reactant and the concentration of the products do not change with time, and the system does not display any further change in properties.

It is the state of a reversible reaction where the rate of the forward reaction equals the rate of the reverse reaction. While a reaction is in equilibrium the concentration of the reactants and products are constant.

Equilibrium shifts in the direction of lesser number of moles when the temperature is increased.

Therefore, the system at equilibrium will shift to the right when the pressure is increased is NH₃(g) = NH₃(aq) and the correct option is option C.

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Answer:

Table Salt (NaCl) is a chemical compound formed from Sodium and Chlorine. A Chemical Element is any substance containing only one atomic number and can be used together to form Compounds. ... Salt is considered a chemical compound because it is a stable structure formed of two chemical elements.

Explanation:

Answer:

C

Explanation:

Temperature is directly related to kinetic energy (KE). As we raise temperature, we are raising KE, as well. Particles with more KE move more quickly and with more force.

This means that these particles are more likely to collide with each other and react to allow the chemical reaction to follow through. In turn, if the chemical reaction is more likely to go to completion, the reaction rate increases, eliminating A and B.

The concentration of the solute is not affected by the temperature; in other words, temperature will not increase or decrease the amount of solute in the solution, so eliminate D.

Thus the answer is C.

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Final answer:

Raising the temperature of a chemical reaction generally increases the rate of reaction due to faster molecular movement, more collisions, and higher chances of overcoming the activation energy barrier. However, the solubility of gases in a solvent typically decreases with increased temperature.

Explanation:

Changing the temperature can significantly influence the rate of a chemical reaction. When you raise the temperature of a chemical reaction, you provide more kinetic energy to the reactants. This increased energy results in the molecules moving faster, leading to a higher frequency of collisions. More importantly, these collisions are more forceful, making it more likely for the reactants to overcome the activation energy barrier and form products. As such, the reaction rate increases with an increase in temperature.

It is important to note, however, that the effect of temperature on solubility can vary depending on the nature of the solute. For example, the solubility of gases such as HCl, NH₃, and SO₂ in a solvent actually decreases with an increase in temperature. This is because a higher temperature gives the gaseous solute molecules more kinetic energy, increasing their tendency to escape the solvent and return to the gas phase.

In summary, among the given options, C) accurately describes the effect of temperature on chemical reactions: Raising the temperature of the reaction increases the reaction rate by increasing the energy and frequency of collisions.

Answer:

Strong electrolyte

Strong electrolyte

Weak electrolyte

Non electrolyte

Considering the equations, the nature of the electrolyte in each case is as follows;

1) Strong electrolyte

2) Strong electrolyte

3) Weak electrolyte

4) Non electrolyte

An electrolyte is a solution that is able to conduct electricity because of the presence of ions in the solution.

We shall now identify whether or not each solution is a strong electrolyte/ weak electrolyte or non electrolyte;

1) Strong electrolyte

2) Strong electrolyte

3) Weak electrolyte

4) Non electrolyte

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