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The number of moles of gas produced from the reaction of 2.00g of potassium with an excess amount of water is 0.025 moles.

The reaction of potassium with an excess amount of water is:

2K + 2H\(_2\)O \(\rightarrow\) 2KOH + H\(_2\)

To calculate the moles of hydrogen gas first we need to calculate moles of potassium in 2.00g

No. of moles = (mass) / (molecular mass)

The mass given is 2.00 g and the Molecular mass is 39.09 units

∴ No. of moles = (2) / (39.09) = 0.05

From the above reaction, we get that 2 moles of potassium give 1 mole of hydrogen gas. Thus, 0.05 moles of potassium gives 0.025 moles of hydrogen gas.

Therefore, the no. of moles of hydrogen gas produced is 0.025 moles.

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Answer:

Top answer:

The maximum mass of water (H₂O) produced from the reaction between

Explanation:

Gaseous methane ch4 will react with gaseous oxygen o2 to produce gaseous carbon dioxide co2 and gaseous water h2o . suppose 1.44 g of ...

Answer:

I'd say 624.2^3 inches.

Explanation:

Answer:

See explanation

Explanation:

A non elementary reaction is a reaction that does not take place in a single reactive encounter. Non elementary reactions take place in steps. These steps are referred to as the reaction mechanism.

The reaction between nitric oxide and oxygen is a non elementary reaction. It takes place in two steps as i will now show below;

Step 1

NO(g) + O2(g) -------> NO2(g) + O(g)

Step 2

NO(g) + O(g) ---------> NO2(g)

Overall reaction equation

2NO(g) + O2(g) ----------> 2NO2(g)

Answer:

NO(g)+O(g)---> NO_2(g)

Explanation:

GIVEN :

• Volume (V1) = 40ml

• Temperature (T1)= 20° C

• Temperature (T2) = 40°C

• Volume (V2) = ?

We will apply Charles law formula : that states that volume is directly proportional to its absolute temperature, if the pressure remains constant

Substituting the given parameters into the above formula, we get that V2 =

Ai. The car's initial kinetic energy is 22657.94 J

Aii. The car's initial potential energy is 939960.1 J

B. The car's final kinetic energy is 171420.38 J

C. The car's change in kinetic energy is 148762.44 J

Ai. How do I determine the car's initial kinetic energy?

We can obtain the initial kinetic energy of the car as illustrated below:

KE₁ = ½mu²

KE₁ = ½ × 566.99 × 8.94²

KE₁ = 22657.94 J

Aii. How do I determine the car's initial potential energy?

The car's initial potential energy can be obtained as shown below:

PE₁ = mgh

PE₁ = 566.99 × 9.8 × 169.164

PE₁ = 939960.1 J

B. How do I determine the car's final kinetic energy?

The final kinetic energy of the car can be obtained as illustrated below:

KE₂ = ½mv²

KE₂ = ½ × 566.99 × 24.59²

KE₂ = 171420.38 J

C. How do I determine the car's change in kinetic energy?

The change in the kinetic energy of the car can be obtained as follow:

ΔKE = KE₂ - KE₁

ΔKE = 171420.38 - 22657.94

ΔKE = 148762.44 J

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Answer:

a chemical change

Explanation:

lighting a match is a chemical change. chemical reactions cause chemical change. in a chemical reaction two or more substances, called the reactants, form different substances called products. hope this helped :)

Answer:

138.19388999999998 grams of silicon dioxide

Answer:

The Gravity on Earth is greater than the gravity on the moon.

Answer:

The Gravity on Earth is greater than the gravity on the moon.

Explanation:

The temperature of the gas in Kelvin, after its volume is reduced to 2,450 mL, is approximately 143.27 K.

To determine the temperature of the gas in Kelvin after its volume is reduced, we can use the combined gas law, which relates the initial and final conditions of pressure, volume, and temperature for a given amount of gas.

The combined gas law equation is:

(P₁ * V₁) / T₁ = (P₂ * V₂) / T₂

Where P₁ and P₂ are the initial and final pressures, V₁ and V₂ are the initial and final volumes, T₁ is the initial temperature in Kelvin, and T₂ is the final temperature in Kelvin.

Given that the initial volume V₁ is 3,480 mL, the initial temperature T₁ is -70.0 °C (which needs to be converted to Kelvin), and the final volume V₂ is 2,450 mL, we can substitute these values into the equation.

To convert -70.0 °C to Kelvin, we add 273.15 to it, resulting in T₁ = 203.15 K.

Now we can solve for T₂:

(T₂ * V₁) / T₁ = V₂

T₂ = (V₂ * T₁) / V₁ = (2,450 mL * 203.15 K) / 3,480 mL

Simplifying the equation, we find:

T₂ ≈ 143.27 K

Therefore, the temperature of the gas in Kelvin, after its volume is reduced to 2,450 mL, is approximately 143.27 K.

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Answer:

It is pollution that comes from many places, all at once. The United States Environmental Protection Agency (EPA) defines point source pollution as any contaminant that enters the environment from an easily identified and confined place. Examples include smokestacks, discharge pipes, and drainage ditches

Answer:

No, CCl₄ is 4 covalent C-Cl single bonds with a Tetrahedral geometry.

Explanation:l

For resonance structures to exist the molecule must have alternating single-double bonds. H₂C = CH - CH₃ <=> H₃C - CH = CH₂ resents a simple compound with a resonance structure system. This means that the π-bond electrons are distributed across all carbons in the molecular backbone. I would recommend internet searching for Danial Weeks 'Pushing Electrons' for a comprehensive review of molecular resonance structures. It is a brief, but easy to follow treatment of simple to complex structures containing resonance systems.

Hope this helps. Doc :-)

Answer:

Shearing -> Skirting & Grading -> Sorting -> Cleaning & Scouring -> Drying -> Baling for shipment

Explanation:

The question is incomplete. Here is the complete question.

An atom of lead has a radius of 154 pm and the average orbitalspeed of the electron in it is about 1.8x\(10^{8}\) m/s. Calculate the least possible uncertainty in a measurement of the speed of an electron in an atom of lead. Write your answer as a percentage of the average speed, and round it to significant 2 digits.

Answer: v% = 0.21 m/s

Explanation: To calculate the uncertainty, use Heisenberg's Uncertainty Principle, which states that:  ΔpΔx≥\(\frac{h}{4\pi }\)

where h is Planck's constant and it is equal to 6.626.\(10^{-34}\)m²kg/s.

Since p (momentum) is p = m.v:

mΔv.Δx ≥ \(\frac{h}{4\pi }\)

Δv = \(\frac{h}{4\pi.x.m }\)

Given that: r = x = 1.54.\(10^{-10}\)m and mass of an electron is m=9.1.\(10^{-31}\)kg

Δv = \(\frac{6.626.10^{-34} }{4.3.14.1.54.10^{-10}.9.1.10^{-31}}\)

Δv = 0.0376.\(10^{7}\)

As percentage of average speed:

Δv.\(\frac{1}{v}\).100% = \(\frac{0.0376.10^{7} }{1.8.10^{8} }\).10² = 0.021.10 = 0.21%

The least possible uncertainty in a speed of an electron is 0.21%.

Answer:

Water

Explanation:

Answer:

C.

Explanation:

I search it on Gøogle

Answer:

THe copper atom contains 29 protons. The nickel atom contains 28 protons. I hope this is correct :)

Explanation:

Answer:

Explanation:The volume of the box is 8.6 × 10³ in².

V = lwh = 26 in × 18.4 in × 17.92 in = 8.6 × 10³ in²

Note: The answer can have only two significant figures because that is all you gave for the length of the box.

bezglasnaaz and 23 more users found this answer helpful

The unknown element is most likely a metalloid. Metalloids have  shiny surface  and conduct electricity less than metals but are brittle in nature.

Metalloids are a class of elements having chemical and physical properties intermediate to that of metals and non-metals.

Like metals, metalloids have shiny  surfaces and appear like a metal but they conduct heat and electricity not as much as metals do.

Boron, germanium, silicon etc. are metalloids and they can form alloys with other metals to be useful in many applications. Metalloids are brittle in nature and thus break easily.

Hence, the sample that the student have is a metalloid and 3rd option is correct.

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It is the 4th scenario is the dependent event. There are 7 gold tokens and 4 silver tokens in a cup. The first student randomly draws a gold token and keeps it. A second student randomly draws a gold token from the cup.

The fouth scenario is a dependent event because the probability of the second student drawing a gold token is affected by the outcome of the first student's draw.

If the first student draws a gold token, then there are only 6 gold tokens left in the cup, the probability changes. but  if the first student does not draw a gold token, then there are 7 gold tokens left in the cup, the probability will remain the same

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Balance the following chemical equations:

1. N2 + 3 H2 → 2 NH3

Ex: Synthesis reaction

2. 2 KClO3 → 2 KCl + 3 O2

Single Replacement reaction

3. 2 NaF + ZnCl2 → ZnF2 + 2 NaCl

Decomposition reaction

4. 2 AlBr3 + 3 Ca(OH)2 → Al2(OH)6 + 6 CaBr2

Double Replacement reaction

5. 2 H2 + O2 → 2 H2O

Combustion reaction

6. 2 AgNO3 + MgCl2 → 2 AgCl + Mg(NO3)2

Synthesis reaction

7. 2 Al + 6 HCl → 2 AlCl3 + 3 H2

Decomposition reaction

8. C3H8 + 5 O2 → 3 CO2 + 4 H2O

Combustion reaction

9. 2 FeCl3 + 6 NaOH → Fe2O3 + 6 NaCl + 3 H2O

Double Replacement reaction

10. 4 P + 5 O2 → 2 P2O5

Synthesis reaction

11. 2 Na + 2 H2O → 2 NaOH + H2

Single Replacement reaction

12. 2 Ag2O → 4 Ag + O2

Decomposition reaction

13. C6H12O6 + 6 O2 → 6 CO2 + 6 H2O

Combustion reaction

14. 2 KBr + MgCl2 → 2 KCl + MgBr2

Double Replacement reaction

15. 2 HNO3 + Ba(OH)2 → Ba(NO3)2 + 2 H2O

Double Replacement reaction

16. C5H12 + 8 O2 → 5 CO2 + 6 H2O

Combustion reaction

17. 4 Al + 3 O2 → 2 Al2O3

Synthesis reaction

18. Fe2O3 + 2 Al → 2 Fe + Al2O3

Single Replacement reaction

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Lewis electron dot notation is a method for representing the valence electrons in an atom. In this notation, the valence electrons are shown as dots around the symbol of the element. The number of dots represents the number of valence electrons.

The Lewis electron dot notation is a useful tool for understanding the chemical behavior of elements. It allows us to see how many valence electrons an atom has and how they are distributed. This information can be used to predict the types of chemical bonds that an atom is likely to form. For example, the Lewis electron dot notation for nitrogen is:
N: ·
Nitrogen has five valence electrons, so there are five dots around the symbol.
In addition to representing individual atoms, the Lewis electron dot notation can also be used to represent molecules. In a molecule, the dots represent the shared electrons between the atoms.  The Lewis electron dot notation is an important concept in chemistry that helps us to understand the properties and behavior of atoms and molecules.

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Answer:

Ionic bond.

Explanation:

Group 7 elements like Bromine (Br) and group 2 elements like Magnesium,(Mg) involved loss and gain of electrons which is typical with Ionic bonding.

Answer:

the hole in Earth was caused by a meteorite

Answer:

As the Mentos candy sinks in the bottle, the candy causes the production of more and more carbon dioxide bubbles, and the rising bubbles react with carbon dioxide that is still dissolved in the soda to cause more carbon dioxide to be freed and create even more bubbles, resulting in the eruption

Answer:

A compound can have more than one chemical formula and still be considered the same compound.

Explanation:

Which of these are not true statements a compound?

A compound's properties are usually not the same as the properties of the elements that make it up.  TRUE. For instance, the salt NaCl has different properties than the solid metal Na and the gaseous nonmetal Cl₂.

A compound always has the same composition.  TRUE. The ratio of elements in a compound is constant.

A compound is made up of more than one type of atom.  TRUE. Unlike elements, compounds are formed by 2 or more elements.

A compound can have more than one chemical formula and still be considered the same compound. FALSE. Each compound can have only one chemical formula.

Ionic bonds are stronger than covalent bonds since they are of opposite charges. This makes them more attracted to each other, creating bonds that are harder to break. Covalent bonds don't have this and only occur to share electrons between atoms.

I hope this helps!

Within 5 years the kinetic energy needed for the phase change of methane is increased by some factors. Hence, the arrow for change in kinetic energy for the phase change can be used here.

The phase change of a substance is the change from one state or phase to the other such as from solid to liquid, liquid to vapor etc. The minimum energy needed to overcome the barrier potential for a physical and chemical change is called its activation energy or activation potential.

A substance need kinetic energy to move apart its molecules which are strongly connected in liquid phase to convert it into vapor phase. If the activation potential increases, the substance need more kinetic energy.

Here, if the kinetic energy needed for the phase change of liquid methane increases. That is the reason why liquid methane in Titan not evaporated for some years.

Here the actual change in kinetic energy is increasing, thus, the methane gas is needed to gain more energy to evaporate. Hence, you have to add the first arrows given in the data.

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