What is the formula for an ionic compound that is composed of potassium and oxygen?

Answer:

3

Explanation:

0's aren't one of the significant figures. so it would just be 3.

Hope this helps!!!

Answer:

3

Explanation:

In multiplication you count the least amount of significant figures. All digits other than leading 0's. If zeros are after, they count as significant.

Answer:

Turbines.

Explanation:

Hello,

In this case, we define steam as high-energy vapor water, which has the capacity to be cooled to release energy to a system. For instance, turbines, use overheated steam to produce energy, by feeding the steam to the turbine's rotor blades in order to make the rotate and generate work. As a consequence of the rotation, the steam loses energy, for which it goes out from the turbine at low both temperature a pressure, even do, in some cases it could go out liquid so a condensation may occur.

Regards.

Answer:

Steam turbines

Explanation:

Mechanical advantage is used to describe the attainment of an amplified force output from a minimal force input

Steam is the water in gaseous form

Therefore, an example of where people use steam for mechanical advantage includes the steam turbines in power generation being turned by steam produced from burning water from a supply.

Here the expansion of the water to steam provides power to drive the the turbines so as to perform mechanical work.

Answer:

C. It is nonspontaneous and requires an electric current.

Explanation:

An oxidation-reduction (redox) reaction is a type of chemical reaction in which electrons are transferred between chemical species. In redox reactions,  a reduced half and an oxidized half occur together. When an object is electroplated, the occurrence of a redox reaction is nonspontaneous and it requires an electric current.

Answer:

No they are not

Explanation:

Energy levels of electrons have fixed distance from the nucleus of an atom where electrons may be found.

orbitals is the path that electrons revolve

Answer:

One gram helium gas is equal to the 4.002602 g/mole

Explanation:

Helium gas is a gas or chemical element. The symbol of helium gas is He and the atomic number of this gas is 2. This gas is colorless, odorless, and tasteless. It is a non-toxic gas. It is found in the periodic table in the first place.

Helium is a very lightest gas and very abundant in nature in the universe. It is present in the universe around 24 percent. Helium is also called by another name that titan of sun. This is detected by the yellow line. The liquid form of helium gas is called cryogenics. This helium gas is used in lifting balloons and airplanes.

Answer: the train was going 25 mph

Explanation: 100 divided by 4 is 25

Answer:

the train traveled 25 Miles per hour

Explanation:

100 divided by 4 is 25

Answer:

F, N O, C, B

Explanation:

Ionization on the periodic table, goes from left to right, so in order to decrease in ionization, you go right to left.

Therefore leading to (F)luorine, (N)itrogen, (O)oxygen, (C)arbon, and (B)oron

Answer:

The proton remains the same.

Explanation:

Oxidation is simply defined as the loss of electron(s) during a chemical reaction either by an atom, molecule or ion.

Oxidation is strictly on the transfer of electron(s) and not proton.

A metal that undergoes oxidation still has its protons intact otherwise it will not be called the ion of the metal since atomic number is called the proton number.

Sodium (Na) undergoes oxidation as follow:

Na —> Na+ + e-

Na is called sodium metal.

Na+ is called sodium ion.

Na has 11 electrons and 11 protons

Na+ has 10 electrons and 11 protons

From the above illustration, we can see that the protons of Na and Na+ are the same why their electrons differ because Na+ indicates that 1 electron has been loss or transferred.

Answer:

Volume will the gas occupy at [tex]70[/tex] kPa [tex]= 5.71[/tex]

Explanation:

As per the gas law

[tex]P_1V_1 = P_2V_2[/tex]

Here

[tex]P_1 =[/tex] initial pressure of the gas

[tex]P_2[/tex] = final pressure of the gas

[tex]V_1 =[/tex] Initial volume of the gas

[tex]V_2[/tex] =  the final volume of the gas

here,

[tex]P_1 = 80[/tex] kPa

[tex]V_1 = 5[/tex] mL

[tex]P_2 = 70[/tex]

Substituting the given values in above equation, we get -

[tex]80 * 5 = 70 * V_2\\V_2 = 5.71[/tex]

Volume will the gas occupy at [tex]70[/tex] kPa [tex]= 5.71[/tex]

Answer: It turns the blue litmus paper to red.

Explanation: A blue litmus paper deeped in a solution of HCl will turn to red, indicating the presence of H+ or H30+, and telling us the solution is an acid.

Answer:

Cs > Ba > Bi > Hf > Ta

Explanation:

The atomic radius of a chemical element defined as the distance between nucleus and electron from the center.

The atomic number and atomic radius of given elements are:

Barium (Ba):

Atomic number - (56)

Atomic radius -  268 pm

Caesium (Cs)

Atomic number - 55

Atomic radius -  343 pm

Hafnium (Hf):

Atomic number - 72

Atomic radius -  225 pm

Bismuth (Bi):

Atomic number - 83

Atomic radius -  230

Tantalum (Ta):

Atomic number - 73

Atomic radius -  220 pm

According to the given atomic radius the decreasing order of atomic radius is Cs > Ba > Bi > Hf > Ta.

Caesium has highest atomic radius among all even though lowest atomic number because the force of attraction between the nucleus and the outermost electron is low and outermost electron are loosely held.

Barium (Ba) has lower atomic number than Bismuth (Bi) but still atomic radius of Barium is high because moving across the periodic table atomic radius decreases as force of attraction between nucleus and outer electrons is high.

Bismuth (Bi) has higher atomic number that Hafnium (Hf), atomic radius of Bi is more than Hf.

Tantalum (Ta) have higher atomic number than Hafnium (Hf) but still have lower atomic radius as as force of attraction between nucleus and outer electrons is high.

Hence, the decreasing atomic radius is Cs > Ba > Bi > Hf > Ta.

Answer:

Producer

Primary Consumer

Secondary Consumer

Tertiary Consumer

Decomposer

Answer:

[tex]N_{solute}=6.64x10^{-3}mol[/tex]

Explanation:

Hello,

In this case, we define molarity as shown below:

[tex]M=\frac{N_{solute}}{V_{solution}}[/tex]

Whereas we have the moles of the solute and the volume of the solution in litres, in such a way, for finding the moles we solve for it as shown below:

[tex]N_{solute}=M*V_{solution}[/tex]

[tex]N_{solute}=0.415\frac{mol}{L} *16.0mL*\frac{1L}{1000mL}\\ \\N_{solute}=6.64x10^{-3}mol[/tex]

Best regards.

Answer:

0.00664 moles of solute are needed to prepare the solution.

Explanation:

Molarity is a unit of concentration based on the volume of a solution and is defined as the number of moles of solute per liter of solution. In other words, molarity is defined as the number of moles of solute that are dissolved in a given volume and is determined by the following expression:

[tex]Molarity (M)=\frac{number of moles of solute}{volume}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].

In this case:

Replacing:

[tex]0.415 M=\frac{number of moles of solute}{0.016 L}[/tex]

Solving:

number of moles of solute= 0.00664

0.00664 moles of solute are needed to prepare the solution.

Answer:

Type of reactions :

Answer:

0.39 moles of gas are in the sample

Explanation:

An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:  

P*V = n*R*T

where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas.

In this case:

Replacing:

0.868 atm*11 L= n*0.082 [tex]\frac{atm*L}{mol*K}[/tex] *298 K

Solving:

[tex]n=\frac{0.868 atm*11 L}{0.082 \frac{atm*L}{mol*K} *298 K}[/tex]

n= 0.39 moles

0.39 moles of gas are in the sample

Answer:

Inorganic chemical reactions involve compounds without carbon atoms. Some of these chemical reactions emit light as the chemical compounds react. When light is emitted as a result of the chemical reaction, the reaction is said to be luminescent.

Explanation:

Answer:

Chemiluminescence is the production of light from a chemical reaction. Two chemicals react to form an excited (high-energy) intermediate, which breaks down releasing some of its energy as photons of light

when heat energy is absorbed

Answer:

Nowhere

Explanation:

The energy doesn't go anywhere, it just gets absorbed into the object making it hotter.

Answer:

water and carbon dioxide

Explanation:

Chemical weathering is the process of changing the composition of a mineral in order to break it down. The two agents that are the biggest proponents of chemical weathering are water and carbon dioxide. Water is used in a process called Hydrolysis which uses it to break down substances such feldspar in granite rocks changing to clay. While Carbon Dioxide in the atmosphere dissolves in rainwater forming carbonic acid, which slowly dissolve rocks when it comes into contact with them.

Answer:

Phosphorus

Explanation:

Group 5A has 5 valence electrons.

3 electron shells equals 15 electrons on Phosphorus. Furthermore, 2 on shell 1, 8 on shell 2, and 5 on shell 3.

- Hope that helps! Please let me know if you need further explanation.

Explanation:

Barium reacts readily with water to form barium hydroxide, Ba(OH)2 and hydrogen gas (H2).

Answer:

Exothermic reaction

Explanation:

It is an exothermic reaction i.e. energy is released during the reaction.

Answer:

evaporation

Explanation:

Answer:

Boiling

Explanation:

When a substance transitions from liquid to gas, it's called evaporation if it's on the surface, and boiling if it's all throughout the liquid.

Picture boiling water in a pot: it starts on the bottom, and the bubbles go toward the top. Evaporation starts on the surface.

Answer:

Required Volume is 22.47ml

Explanation:

To make 2.0L of 0.2M sulfuric acid required moles = 0.2 x 2 = 0.4 moles

To get 0.4 from 17.8M required quantity = 1000/17.8 x 0.4 = 22.47ml

Answer:

factory emissions

Explanation:

Answer:

Explanation:

Enertia is an integral part of Newton's first law of motion.

It is the tendency of an object to stay at rest or to continue moving until and unless any external unbalanced force, (like, applied force or force of tension or frictional force ) is applied to either move it from rest or change its speed(in other words, accelerate it!!).

Example below, is of ball at rest (fig1) and if this ball is moving straight on a frictionless surface(like ice) it will keep moving!! until, we push it or pull it.

Answer:

% yield = 44.5 %

Explanation:

Step 1: Data given

Mass of Mg3N2 = 100.0 grams

Mass of H2O = 75.0 grams

Mass of NH3 = 15.0 grams

Molar mass of Mg3N2 = 100.95 g/mol

Molar mass of H2O = 18.02 g/mol

Molar mass of NH3 = 17.03 g/mol

Step 2: The balanced equation

Mg3N2 + 3H2O → 3MgO + 2NH3

Step 3: Calculate moles

Moles = mass / molar mass

Moles Mg3N2 = 100 grams / 100.95 g/mol

Moles Mg3N2 = 0.99 moles

Moles H2O = 75.0 grams / 18.02 g/mol

Moles H2O = 4.16 moles

Moles NH3 = 15.0 grams / 17.03 g/mol

Moles NH3 = 0.88 moles

Step 4: Calculate the limiting reactant

For 1 mol Mg3N2 we need 3 moles H2O to produce 3 moles MgO and 2 moles NH3

Mg3N2 is the limiting reactant. It will completely be consumed (0.99 moles)

H2O is in excess. There will react 3*0.99 = 2.97 moles

There will be produced 2*0.99 = 1.98 moles of NH3

Step 5: calculate mass of NH3

Mass of NH3 = moles NH3 * molar mass NH3

Mass NH3 = 1.98 moles * 17.03 g/mol

Mass of NH3 = 33.7 grams

Step 6: Calculate the % yield

%yield = (actual yield/ theoretical yield) * 100 %

% yield = (15.0 grams / 33.7) * 100 %

% yield = 44.5 %

The percentage yield of ammonia in the given reaction has been 44.44%.

The balanced chemical reaction can be:

[tex]\rm Mg_3N_2\;+\;3\;H_2O\;\rightarrow\;3\;MgO\;+\;2\;NH_3[/tex]

The moles can be given as:

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

Moles of [tex]\rm Mg_3N_2[/tex] = 0.99 mol

Moles of [tex]\rm H_2O[/tex] = 4.16 mol

Moles of [tex]\rm NH_3[/tex] = 0.88 mol

The limiting reactant can be:

From the balanced equation for 3 moles of water, there has been 1 mole of magnesium nitrite. So, for 4.16 moles of water, there will be 1.38 moles of [tex]\rm Mg_3N_2[/tex]. Since the amount of [tex]\rm Mg_3N_2[/tex] has been completely consumed in the reaction, [tex]\rm Mg_3N_2[/tex] has been the limiting reactant.

So, the moles of ammonia produced =

1 moles [tex]\rm Mg_3N_2[/tex] = 2 moles ammonia.

0.99 moles [tex]\rm Mg_3N_2[/tex] = 0.99 [tex]\times[/tex] 2 moles [tex]\rm NH_3[/tex]

0.99 moles [tex]\rm Mg_3N_2[/tex] = 1.98 moles of ammonia.

The theoretical yield of ammonia = 1.98 moles

The actual yield of ammonia = 0.88 mol.

% Yield of Ammonia = [tex]\rm \dfrac{Actual\;yield}{Theoretical\;yield}\;\times\;100[/tex]

% Yield of Ammonia = [tex]\rm \dfrac{0.88}{1.98}\;\times\;100[/tex]

% Yield of Ammonia = 44.44 %

For more information about percentage yield, refer to the link:

https://brainly.com/question/12809634

Answer:

Sound waves and light waves need to change places

Explanation:

Just did this assignment on edge. Sound waves are mechanical because they need matter to travel through, while light waves are electromagnetic.

Answer:

Sound waves and light waves need to change places

Explanation: