How many atoms are in 25.00 g of Li.

Answer:

28 g CO

Explanation:

First convert grams to moles.

1 mole C = 12.011 g (I'm just going to round to 12 for the sake of this problem)

12 g C • [tex]\frac{1 mol C}{12 g C}[/tex] = 1 mol C

1 mol O = 15.996 g (I'm just going to round to 16)

16 g O • [tex]\frac{1 mol O}{16 g O}[/tex] = 1 mol O

So the unbalanced equation is:

[tex]C + O_{2}[/tex] -> [tex]CO[/tex] (the oxygen has a 2 subscript because it is part of HONClBrIF meaning when not in a compound these elements appear in pairs - called diatomic elements)

The balanced equation is:

[tex]2 C + O_2[/tex] -> [tex]2 CO[/tex]

However, carbon is the limiting reactant in this equation and two moles cannot react because only 12 g (1 mole) are present. Therefore, use the equation

[tex]C + \frac{1}{2} O_2[/tex] -> [tex]CO[/tex].

1 mole of CO is formed, therefore 12 g + 16 g = 28 g CO.

Answer:

THe atomic number of an element is the same number of protons and electrons the element has.

Explanation:

The atomic number is the number of protons that is equal to the of electrons. Also, the mass numbers can be used for the number of neutrons. So the isotope of the element and its valency can be determined by the atomic number and mass number.

Because they are calculated by counting whole items, the atomic b and mass number are always whole values (protons, neutrons, and electrons). The total number of subatomic particles found in an atom is equal to the sum of the mass number and atomic number for an atom (A-Z). The mass number indicates, in atomic mass units, the mass of the atom's nucleus (amu).

The amount of protons each element has determined its atomic number, which is used to distinguish one element from another. The total number of protons and neutrons in an element determines its mass number.

All of the elements in the contemporary periodic table have rising atomic numbers, and as a result, increasing mass numbers. As you are aware, an atom is made up of protons, neutrons, and electrons.

We can determine an atom's valency by counting the number of electrons in its outermost shell. Similar to this, the atomic number and mass number of the atom are related to the number of protons and neutrons.

Therefore, the knowledge of the atomic number and mass number can help in determining the valency and isotope of the element.

Read more about the atomic numbers, here

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Answer:

-400.3 kJ/mol

Explanation:

Answer:

Diffusion helps cells maintain homeostasis by allowing ions to move across the cell membrane to maintaing both the voltage across the membrane and the ion concentrations.

Diffusion helps in maintaining homeostasis by allowing movement of ions in and out across the cell.

Diffusion is defined as the process of movement of molecules which takes place under concentration gradient. It helps in movement of substances in and out from the cell.The molecules move from lower concentration region to a higher concentration region till the concentration becomes equal.

There are 2 main types of diffusion:

1) simple diffusion-process in which substances move through a semi-permeable membrane without the aid of transport proteins.

2) facilitated diffusion- It is a passive  movement of molecules across cell  membrane  from higher concentration region to lower concentration.

There are 2 types of facilitated diffusion one is osmosis and dialysis.

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Answer:

I'm not to sure I'll ask one of my frens to help

Answer:

gain2 electrons

Explanation:

that the answer to that question

Answer:

transferred

Energy

Explanation:

Energy is the ability to change the state of bringing about a work leading to movement or generating electromagnetic radiation. There are actually many forms of energy. So, kinetic energy is a form of energy related to the movement of a body. The combustion, in turn, retrieves the potential energy chemical contained in fuels. Solar panels capture light energy to transform it into electrical energy.

Answer:

[tex]\frac{15}{7}N[/tex]

Explanation:

We already know that the mass number of an atom is the sum of the number of protons and the number of neutrons.

So, the mass number of this isotope is;

Number of protons = 7

Number of neutrons = 8

Mass number = 7 + 8 = 15

Hence, the isotope is;

[tex]\frac{15}{7}N[/tex]

Answer:

ok horita te ayudo ok esperame okey bueno

George W. Bush lol nvm just trolling.

Correct answer is Alquaida flew with 2 airplanes into the twin towers at the 11. September 2001

Explanation:

The ground state electron configuration of ground state gaseous neutral potassium is 4s1 and the term symbol is 2S1/2.

Answer: The molecular formula will be [tex]C_3H_9[/tex]

Explanation:

Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.  

Empirical formula is the simplest chemical formula which depicts the whole number of atoms of each element present in the compound.  

The empirical formula is [tex]CH_3[/tex]

The empirical weight of [tex]CH_3[/tex] = 1(12)+3(1)= 15g.

The molecular weight = 45.0 g/mole

Now we have to calculate the molecular formula:

[tex]n=\frac{\text{Molecular weight }}{\text{Equivalent weight}}=\frac{45}{15}=3[/tex]

The molecular formula will be=[tex]3\times CH_3=C_3H_9[/tex]

Thus molecular formula will be [tex]C_3H_9[/tex]

Answer: [tex]_{70}^{177}\textrm{Yb}\rightarrow _{71}^{177}\textrm{Lu}+_{-1}^{0}\textrm{e}[/tex]

Explanation:

Beta-decay: In this process, a neutron gets converted into a proton and an electron releasing a beta-particle. The beta particle released is basically a electron with -1 charge and no mass.

[tex]_Z^A\textrm{X}\rightarrow _{Z+1}^A\textrm{X}+_{-1}^{0}\textrm{e}[/tex]

General representation of an element is given as:  

where,

Z represents Atomic number

A represents Mass number

X represents the symbol of an element

[tex]_{70}^{177}\textrm{Yb}\rightarrow _{71}^{177}\textrm{Lu}+_{-1}^{0}\textrm{e}[/tex]

Answer:

i think it is true

Explanation:

if it correct plz plz mark as brainliest

thank you

19NBoli

Answer:

i hope my answer help you

Explanation:

a/true

Answer:

Intertidal zone (i think)

Explanation:

Answer:

A

Explanation:

Answer:

Pb(OH)4 + 2Cu2O → PbO2 + 4CuOH  

Explanation:

Pb(OH)4 + Cu2O --> PbO2 + CuOH

The end goal of balacing chemical equations is to make sure there is no gain or loss of atoms of elements. Number of atoms of elements in the left side (reactant) must balance with the right side (product) of the reaction.

Currently, the number of Cu, H and O atoms are not balanced.

Pb

Reactant = 1, Product = 1

O

Reactant = 5, Product = 3

Cu

Reactant = 2, Product = 1

H

Reactant = 4, Product = 1

The balanced equation is given as;

Pb(OH)4 + 2Cu2O → PbO2 + 4CuOH  

Pb

Reactant = 1, Product = 1

O

Reactant = 6, Product = 6

Cu

Reactant = 4, Product = 4

H

Reactant = 4, Product = 4

Answer:

Fertilisers

And also organic compounds

Answer:

1.023 J / g °C

Explanation:

m = 37.9 grams

ΔT = 25.0*C

H = 969 J

c = ?

The equation relating these equation is;

H = mcΔT

making c subject of formulae;

c = H / mΔT

c = 969 J / (37.9 g * 25.0*C)

Upon solving;

c = 1.023 J / g °C

Answer:

72.2 ml

Explanation:

The neutralization equation between HBr (acid) and NaOH (base) is the following:

HBr(aq) + NaOH(aq) → NaBr(aq) + H₂O(l)

We can see that 1 mol of HBr reacts with 1 mol of NaOH. At the equivalence point, the total number of moles of HBr reacts with the total number of moles of NaOH. The number of moles can be calculated as the product between the molarity (M, in mol/L) and the volume (V). So, we can equal the quantities of acid and base, as follows:

moles HBr = moles NaOH

M(HBr) x V(HBr) = M(NaOH) x V(NaOH)

Now, we calculate the volume of NaOH with the data:

V(NaOH)= M(HBr) x V(HBr)/M(NaOH)

              = (2.60 mol/L x 50.0 ml)/(1.80 mol/L)

              =72.2 ml

Answer:

Atomic mass is 10.81

Answer:

0.136mol

Explanation:

Using the general gas law equation as follows:

PV = nRT

Where;

P = pressure (atm)

V = volume (Litres)

n = number of moles (mol)

R = gas constant (0.0821 Latm/mol K)

T = temperature (K)

K = °C + 273

K = 50°C + 273

K = 323K

According to this question, P = 3.6atm, T = 323K, V = 1.00L, R = 0.0821 Latm/mol K, n = ?

3.6 × 1 = n × 0.0821 × 323

3.6 = 26.52n

n = 3.6/25.52

n = 0.1357

n = 0.136mol

Answer:

The uncharged water is attracted to the charged balloon.

Explanation:

Electrostatics is the study of charges at rest. Neutral bodies have equal and evenly distributed positive and negative charges. However, these neutral bodies can become either positively or negatively charged. These charges can be produced by either of friction, contact or electrostatic induction.

For example, when an ebonite rod is rubbed with fur, the ebonite rod acquires a charge by friction. The ebonite rod becomes negatively charged while the fur is left with positive charges.

Similarly, for the experiment performed by Yolanda, when she rubs a cloth against a balloon, the balloon becomes negatively charged . Water is neutral in that it is composed of equal positive and negative charged particles. When she brings the balloon near the water, the positive charged particles in the water will move the water towards the negatively charged balloon since positive and negative charges are attracted to each other.

Answer:

if charge of ion is positive then it will loose electron

if charge of ion is negative it will gain electron

119 so a I think that's Is me anser

The volume of space it takes up, whereas its mass is the amount of matter it contains. A sample's density is the quantity of mass per unit of volume.

[tex]HClO_4 +NaOH \longrightarrow NaClO_4 + H_2O\\\\[/tex]

HClO₄ is a monoprotic strong acid.

1 mol of HClO₄ reacts with 1 mol of NaOH for neutralization.

Calculating the moles of NaOH [tex]= (0.0789\ M) \times (0.050\ L) = 0.003945\ mol[/tex]

Calculating the needed moles in HClO₄ [tex]= 0.003945 \ mol[/tex]

Calculating the HClO₄ Molarity that is 0.188 M

Calculating the HClO₄ volume that is needed [tex]= \frac{(0.003945\ mol) }{ (0.188\ M)} = 0.020\ L[/tex]

Therefore, the volume of HClO₄ that is needed = 20 mL

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Answer:

It looks right to me make sure you have sig figs if the question asked for it though so you smalles figure would be 3 so with sig figs your answer would be 1190cm3

Answer

The elements in increasing order of atomic radius: oxygen, carbon, aluminum, potassium

Explanation:

The distance from the center of the nucleus to the outermost shell of the electron is known as the atomic radius of an element. The atomic radius decreases rightward along each period (row) of the table due to the increase in effective nuclear charge (the charge of the nucleus equal to the number of protons). Across a period, electrons are added to the same energy level and the increasing number of protons causes the nucleus to exert more pull on these electrons, which makes the atomic radius smaller.  Atomic radius increases down each group (column) of the periodic table because of the addition of electrons to higher energy levels, which are further away from the nucleus and the pull of nucleus weakens. Another reason for the increase in atomic radius is the electron shielding effect, which is the reduction of the attractive force between a nucleus and its outer electrons due to the blocking effect of inner electrons

While moving from left to right in the second period, c arbon comes before  oxygen  and so oxygen will have a smaller atomic radius than  carbon. While moving down the periodic table, al uminum comes before  potassium even if they are not in the same period. So aluminum 's atomic radius will be smaller than that of  potassium  but bigger than that of  carbon  and  oxygen.

(hope that helps can i plz have brainlist it will make my day :D hehe)

Answer:

The new temperature will be 204.4 K

Explanation:

As the volume increases, the particles (atoms or molecules) of the gas take longer to reach the walls of the container and therefore collide with them less times per unit of time. This means that the pressure will be lower because it represents the frequency of collisions of the gas against the walls. In this way pressure and volume are related, determining Boyle's law which says:

"The volume occupied by a certain gaseous mass at constant temperature is inversely proportional to pressure"

Boyle's law is expressed mathematically as:

Pressure * Volume = constant

or P * V = k

Charles's Law consists of the relationship between the volume and the temperature of a certain quantity of ideal gas, which is kept at a constant pressure, by means of a constant of proportionality that is applied directly. For a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature is directly related to the energy of the movement of the gas molecules. .

In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the ratio between the volume and the temperature will always have the same value:

[tex]\frac{V}{T} =k[/tex]

Finally, Gay-Lussac's law can be expressed mathematically as follows:

[tex]\frac{P}{T} =k[/tex]

This law indicates that the quotient between pressure and temperature is constant.

This law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the molecules of the gas move faster. Then the number of collisions against the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

[tex]\frac{P*V}{T} =k[/tex]

You want to study two different states, an initial state and a final state. It will happen:

[tex]\frac{P1*V1}{T1} =\frac{P2*V2}{T2}[/tex]

In this case:

Replacing:

[tex]\frac{100 kPa*150 mL}{292 K} =\frac{105 kPa*100 mL}{T2}[/tex]

Solving:

[tex]T2=105 kPa*100 mL*\frac{292 K}{100 kPa*150 mL}[/tex]

T2= 204.4 K

The new temperature will be 204.4 K