Element Z has a mass of 430g. Scientists determined it to have a ½ life of 5 years. How many grams of element Z will remain after 15 years?

The equilibrium constant shows the extent to which reactants are converted into products.

In this case, we must find the reaction quotient as follows;

Qc = [0.55]^2/[0.12] = 2.5

Since the Qc > Kc, it means that the reverse direction is favored in this reaction.

Learn more about Kc:https://brainly.com/question/15856317

#SPJ1

Stars form in large, dense regions of gas and dust known as molecular clouds. These clouds are located primarily in the spiral arms of galaxies, where they are exposed to intense radiation from nearby stars. As the gas and dust in these clouds are subjected to this radiation, they begin to collapse under their own gravity. As the collapse continues, the cloud becomes denser and denser, and eventually a protostar forms at its center. Over time, this protostar continues to contract and heat up, eventually reaching the point where nuclear fusion can begin in its core. At this point, the protostar becomes a fully-fledged star, and the process of star formation is complete.

TL;DR: Within the clouds of dust and scattered throughout most galaxies.

5 pennies weight 14 to 13 grams

Braineist pls?

- Liyah

The element belongs to group 1A of the periodic table because it has only one electron in its 3s orbital.

Based on the electronic configuration, the element is a reducing agent.

Electronegativity is the ability of an atom of an element to attract electrons to itself.

A neutral atom that has high electronegativity will gain electrons to form an anion during ionic bond formation.

The electronic configuration of an element is the arrangement of the electrons found in the atom of the element in shells or orbitals around the nucleus.

Electronic configuration arranges the electrons in the atom of the element in increasing order of energy level.

Considering the given element with the electronic configuration shown below:

electronic configuration of element = 1s²2s²2p⁶3s¹

The element belongs to group 1A of the periodic table because it has only one electron in its 3s orbital, the valence orbital.

Based on the electronic configuration, the element is a good reducing agent.

Electronegativity is the ability of an atom of an element to attract electrons to itself.

A neutral atom that has high electronegativity will gain electrons to form a negative ion or anion  during ionic bond formation.

Learn more about electronic configuration at: https://brainly.com/question/26084288
#SPJ1

Answer:

Chemical symbols are used to standardize the 'language of chemistry' and to identify elements and atoms in a chemical formula easily. Chemical symbols consist of one or two letters, most often derived from the name of the element.

Explanation:

Answer:

Explanation:

A chemical symbol is a notation of one or two letters representing a chemical element. Its used to  identify elements and atoms in a chemical formula easily. Chemical symbols consist of one or two letters, most often derived from the name of the element.

Answer:

We need more? What else is in the question? This is unanswerable.

Explanation:

The two chemical compounds are not the same, because their ratio is not equal. In both samples the composition of lead and oxygen is different.

A chemical compound is a substance made of numerous similar molecules (or molecular entities) joined by chemical bonds and comprising atoms from various chemical elements. Therefore, a molecule made up of only one type of atom is not a compound. Chemical reactions, which may entail interactions with other molecules, can change a compound into a distinct substance. Atomic bonds may be broken or new ones created during this process.

sample 1 = mass of lead / mass of oxygen = 12.92g/2g = 6.46 .

sample 2 = mass of lead/ mass of oxygen = 34.27 - 14.39/14.39 = 1.38 .

so, the ratios are not the same.

Hence, the two chemical compounds are not the same, because their ratio is not equal. In both samples the composition of lead and oxygen is different.

To know more about Chemical compounds, check out:

https://brainly.com/question/26487468

#SPJ1

Answer:

How do amoeba respire.

Define Diffusion.

Answer:

Physical Change

Explanation:

Sublimation is a physical change. When a substance sublimes, it changes from a solid to a gas without going through the liquid phase.

Answer:

Voltage is the measure of electric potential energy per unit charge, current is the flow of electric charge through a circuit, and resistance is the property of a material that opposes the flow of electric current.

Ohm's Law relates these three concepts by stating that current is directly proportional to voltage and inversely proportional to resistance.

Hope this helps!

Because it is not very effective at transferring \(H^{+}\) ions to water, vinegar is a weak acid. Less than 0.4% of the \(CH_{3}CO_{2}H\)molecules in a 1 M solution interact with water to create \(H_{3}O^{+}\)and \(CH_{3}CO_{2}^{-}\) ions. More than 99.6% of the acetic acid molecules are still whole.

For more information on weak acid kindly visit to

https://brainly.com/question/22104949

#SPJ1

Answer:

C

Explanation:

It looks pretty reasonable to me

Answer:

The reaction will shift leftwards, towards the formation of more cyclohexane at 25 °C

Explanation:

Hello,

In this case, for the given chemical reaction, we can write the law of mass action (equilibrium expression) as shown below:

\(Kc=\frac{[CH_3C_5H_9]}{[C_6H_{12} ]}\)

Thus, since Kc < 1, we can conclude there are more moles of cyclohexane at equilibrium (denominator is greater than numerator), therefore, the reaction will shift leftwards, towards the formation of more cyclohexane at 25 °C.

Best regards.

Answer:

Below

Explanation:

I1-

Te2-

Ba2+

Cs1+

The general gas equation, commonly referred to as the ideal gas law, represents the state of a fictitious ideal gas through an equation. Here the mass of helium gas required to pressurize 86 L tank to 201 atm is 2561.8 g.

According to the ideal gas law, the sum of the absolute temperature of the gas and the universal gas constant is equal to the product of the pressure and volume of one gram of an ideal gas.

The ideal gas equation is given as:

PV = nRT

n = PV / RT

56°C = 329 K

n = 201 × 86 / 0.08206 × 329 = 640.45 mol

Molar mass of 'He' = 4.00 g / mol

Mass =  640.45 × 4.00 = 2561.8 g

To know more about ideal gas law, visit;

https://brainly.com/question/30458409

#SPJ1

Answer:

electric energy then chemical energy

Explanation:

A battery is a device that converts chemical energy

Answer:

0.714 m (app.)

Explanation:

use ∧ = c/f

here, ∧ = wavelength

c = velocity of light = 3 × 10^8 m/s

f = frequency = 4.2 × 10^8 Hz

Answer:

A. non fiction or a ajami to download

Answer:

I think you should, after you complete it and turn it in then you have nothing else to worry about! Get it out the way and do it :)

Answer:

Heres my advice. Dont wait exactly until the deadline.

Explanation:

If its the last assignment, be lazy. do what you want! but, if you only have a week to turn it in then do it on the 4th day then turn it in.

Answer:

name four agricultural inputs are subsidized by the government

0.297 kJ of heat is needed to raise the temperature of 10g of aluminum from 22 degrees Celsius to 55 degrees Celsius.

The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.

It is a measure of how much energy it takes to raise the temperature of a substance. It is the amount of heat necessary to raise one mass unit of that substance by one temperature unit.

It is given by the formula -

                                                  Q = mcΔT

where, Q = amount of heat

m = mass

c = specific heat

ΔT = Change in temperature

Given,

mass = 10g

c = 0.901J/g⁰C

Initial temperature (T₁) = 22⁰C

Final Temperature (T₂) = 55⁰C

Q = mcΔT

= 10 × 0.901 × (55 -22)

= 297.33 J = 0.297 kJ

Learn more about Specific heat, here:

https://brainly.com/question/31608647

#SPJ1  

Answer:1.85786

Explanation:

Answer:

B) Germanium atoms have more electrons than titanium atoms

Explanation:

Trust me I did this but for those who are hesitant

---> Conductors : It is a type of substance which conduct electricity that means it allow the electrons to flow through them.

Example of conductors are, iron, aluminium, gold, etc.

Insulators : It is a type of substance which does not conduct electricity that means it does not allow the electrons to flow through them.

Examples of insulators are, glass, rubber, ceramics, etc.

Semiconductors : It is a type of substance which conduct electricity under certain conditions that means it allow the electrons to flow through them. The conductivity level of semiconductors lie between the conductors and the insulators.

The good examples of semiconductors are silicon, germanium, gallium, and  selenium.

In the given options, aluminium, gold are the metals which conduct electricity and concrete is an insulator which do not conduct electricity while the germanium is the good semiconductor.

We can see here that the catalytic cycle for the hydrogenation of alkenes using Wilkinson's catalyst involves several steps.

Here's an overview of the catalytic cycle, including the necessary details:

i. Chemical structure of the catalyst:

Wilkinson's catalyst, also known as chloridotris(triphenylphosphine)rhodium(I), has the following chemical structure: [RhCl(PPh3)3]

ii. Molecular geometry of the catalyst:

The Wilkinson's catalyst has a trigonal bipyramidal geometry around the rhodium center. The three triphenylphosphine (PPh3) ligands occupy equatorial positions, while the chloride (Cl) ligand occupies an axial position.

iii. Type of reactions involved:

The catalytic cycle involves several reactions, including:

iv. Starting material, reagent, and solvent:

The starting material is an alkene, and the reagent is Wilkinson's catalyst ([RhCl(PPh3)3]). The reaction is typically carried out in a suitable solvent, such as dichloromethane (CH2Cl2) or tetrahydrofuran (THF).

v. Major and minor end-products:

The major end-product of the hydrogenation reaction is the fully saturated alkane, resulting from the addition of hydrogen across the double bond. The minor end-product may include cis- or trans-configured alkanes if the original alkene substrate possesses geometric isomers.

vi. Intermediates:

The intermediates in the catalytic cycle include:

These intermediates play a crucial role in facilitating the hydrogenation reaction and enabling the catalytic cycle to proceed.

Learn more about Wilkinson’s catalyst on https://brainly.com/question/31972308

#SPJ1

Answer:

18.015

Explanation:

Using the periodic table of the elements to find atomic weights, we find that hydrogen has an atomic weight of 1, and oxygen's is 16. In order to calculate the molecular weight of one water molecule, we add the contributions from each atom; that is, 2(1) + 1(16) = 18 grams/mole.

The total kilojoules in two tablespoons is  836.8 kJ.

To determine the total kilojoules in two tablespoons of a substance, we need to know the specific substance and its energy content per tablespoon. Different substances have different energy values, so without this information, it is not possible to provide an accurate calculation.

The energy content of food or substances is typically measured in kilocalories (kcal) or kilojoules (kJ). 1 kilocalorie is equal to 4.184 kilojoules. The energy content of a substance is often listed on food labels or in nutritional databases.

For example, if we have the energy content of a substance as 100 kilocalories (kcal) per tablespoon, we can convert it to kilojoules by multiplying it by 4.184:

100 kcal * 4.184 kJ/kcal = 418.4 kJ

So, if we have two tablespoons of this substance, the total energy would be:

418.4 kJ/tablespoon * 2 tablespoons = 836.8 kJ

It's important to note that the energy content of a substance can vary depending on its composition, density, and other factors. Therefore, it is always recommended to refer to reliable sources such as food labels, nutritional databases, or consult a qualified professional to obtain accurate information regarding the energy content of specific substances.

For more such information on: kilojoules

https://brainly.com/question/29497478

#SPJ8

Answer:

30 center meters

Explanation:

2.15-1.85=0.30

The question is incomplete, the complete question is;

A molecule that contains three identical polar bonds to the central atom will be ________.

nonpolar if the geometry is planar triangular

polar in all cases

nonpolar in all cases

impossible to tell the polarity

either polar or nonpolar depending on the identity of the atoms bonded to the central atom

Answer:

Nonpolar if the geometry is planar triangular

Explanation:

The polarity of molecules depends both on the polarity of individual bonds in the molecule as well as the overall dipole moment of the molecule. We must remember that dipole moment is a vector quantity hence direction of the resultant vector is very important.

Now, if i have a molecule that contains three identical polar bonds, a planar triangular geometry means that the molecule is symmetrical and will have an overall dipole moment of zero. Hence the molecule is nonpolar.

Answer: 4

Explanation:

The equation C2H4(g) + H2(g) + C2H6(g) → Caco3(s) + Cao(s) + CO2(g) shows an increase in entropy due to the formation of a gas as a product. Option A

In this equation, the reactants on the left-hand side consist of gases (C2H4 and H2), while the products on the right-hand side include a solid (Caco3) and a gas (CO2).

When a reaction involves a change from gaseous to solid or liquid states, there is typically a decrease in entropy because the particles become more ordered and constrained in the solid or liquid phase.

Conversely, when a reaction involves the formation of gases, there is generally an increase in entropy because gases have higher degrees of molecular motion and greater freedom of movement compared to solids or liquids.

In the given equation, the reactants include three gaseous compounds (C2H4, H2, and C2H6), and one of the products is a gas (CO2). Therefore, the overall entropy of the system increases during this reaction.

The equation Fe(s) + S(s) → FeS(s) does not show an increase in entropy. Both the reactants (Fe and S) and the product (FeS) are solids. Since solids have lower entropy compared to gases or liquids, the entropy of the system does not increase in this reaction. Option A

For more such questions on entropy visit:

https://brainly.com/question/30481619

#SPJ8

The concentration of the HCl is 0.09 M.

The process of titration involves using a concentration of known concentration to determine the unknown concentration of another solution.

Titration experiments usually involve acids and bases.

The concentration of the HCl acid, Ca, is calculated as follows:

Ca = CbVb * Na/Va * Nb

Cb = 0.15 M

Vb = 30.5 - 0.5 = 30.0 mL

Na = 1

Va = 50.0 mL

Nb = 1

Ca = 0.15 * 30 * 1/50 * 1

Ca = 0.09 M

In conclusion, the concentration of the HCl is calculated from the amount of NaOH required to react with it.

Learn more about titration at: https://brainly.com/question/186765

#SPJ1