Noble gases are unreactive because, except for helium, they have a stable arrangement of____ valence electrons in the outer energy level. This arrangement is called a(n)____

Answer:

Explanation:

Before we jump into it, I just want to point out that a microwave oven has two

power ratings.  One is the amount of electrical power it takes from the wall outlet to do its job. The other is the "cooking power" it delivers into the chamber in the form of microwave radiation to heat the meatloaf.  The utility power required from the wall outlet is always more than the cooking power radiated into the chamber.

But we didn't really need to go into all that in order to answer the question.

1 watt = 1 joule per second

1 minute = 60 seconds

(850 watts) x (1 (joule/sec) / watt) x (60sec/min) x (6 minutes) = 306,000 joules  

A  substance that gives up a proton during a chemical reaction, raising the hydrogen ion concentration of water, is most appropriately called acid.

An acid is a substance that produces hydrogen ion as the only positive ion produced in water. This is the Arrhenius definition of an acid. As such, the acid gives out a proton to water and oxonium ion is formed.

Thus, substance that gives up a proton during a chemical reaction, raising the hydrogen ion concentration of water, is most appropriately called acid.

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Hydrochloric acid (HCl) is a strong acid that can dissolve many metals, including calcium (Ca), sodium (Na), cadmium (Cd), and nickel (Ni).

The correct answer is E.

When these metals come into contact with HCl, they undergo a chemical reaction in which they are oxidized and dissolved.The reaction between HCl and metals such as Ca, Na, Cd, and Ni is exothermic and can release hydrogen gas (H2).

This reaction is often used in laboratory experiments and industrial processes to dissolve metals or to generate H2 gas. However, it is important to handle HCl with caution as it is a corrosive and toxic substance that can cause burns and respiratory problems if not used properly.

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Answer: https://homework.study.com/explanation/if-the-pk-a-values-for-phosphoric-acid-are-2-15-6-82-and-12-38-at-what-ph-would-one-observe-equal-amounts-of-h-2-po-4-and-hpo-4-2.html

Explanation:

website to the answer lol

Answer:

WHY DO YOU NEED HELP HUH

DON'T CHEAT READ AND STUDY

Explanation:

Answer:

It's C

Explanation:

Answer: Hope that helps!

Explanation: Researchers at NASA and the Department of Energy recently tested key technologies for developing a nuclear fission reactor that could power a human outpost on the moon or Mars. The tests prove that the agencies could build a “safe, reliable, and efficient” system by 2020, the year NASA plans to return humans to the moon.

I think and I'm sure it is gases

Answer:

gasses

Explanation:

i took the quiz

The mass, in grams, of the sample of methanol (CH₃OH) is 64 grams.

Mass of any substance can be calculated by using moles as:

n = W/M, where

W = required mass

M = molar mass

In the question that:

Moles of methanol = 2mole

Molar mass of methanol = 32g/mole

On putting these values in the above equation, we get

W = n × M

W = 2mole × 32g/mole = 64g

Hence, 64 grams is the mass of the sample.

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Explanation:

when a big number is behind a compound, it means there is 2 of it.

for example 2Na would mean there is a sodium atom and another sodium atom not joined together, but they're just near.

when there is a 2 (which should be small and at the bottom) after an atom, it means there are 2 of that atom.

i hope this helps

The given question is incomplete. The complete question is:

Determine how many carbon dioxide molecules are produced if molecules of water are produced

\(C_2H_6(g)+O_2 (g)\rightarrow CO2(g)+H_2O(g)\)

Answer: \(5.60\times 10^{23}\) molecules of carbon dioxide are produced

Explanation:

The balanced chemical equation is:

\(2C_2H_6(g)+7O_2 (g)\rightarrow 4CO2(g)+6H_2O(g)\)

\(\text{Moles of water}=\frac{\text{given molecules}}{\text{Avogadros number}}=\frac{8.45\times 10^{23}}{6.023\\times 10^{23}}=1.40moles\)

Accoding to stoichiometry:

6 moles of water are produced along with = 4 moles of carbon dioxide

Thus 1.40 moles of water are produced along with = \(\frac{4}{6}\times 1.40=0.93\) moles of carbon dioxide

Molecules of carbon dioxide = \(moles\times {\text {Avogadros number}}=0.93\times 6.023\times 10^{23}=5.60\times 10^{23}\)

The number of moles in container 2 is 33.3moles when the container has 27.32L of gas inside it

The number of moles of gas in container 2 can be calculated using the Ideal Gas Law:  

n = PV/RT  

where n is the number of moles of the gas with known volume,

P is the pressure (assumed to be 1 atm for ideal gases),

V is the volume (27.32 liters),

R is the ideal gas constant (0.0821 L·atm/mol·K) and

T is the temperature (assumed to be 273.15 K).  

Plugging in the values, we get:  

n = (1 atm)(27.32 L)/(0.0821 L·atm/mol·K)(273.15 K)

n = 33.3 mol  

Therefore, there are 33.3 moles of gas in container 2.

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Answer:

Each atom is left with a complete outer shell. An ionic bond forms between a metal ion with a positive charge and a nonmetal ion with a negative charge.

HOPE DAT HELPS BRO!

Answer:

The subscript next to the letter "C" will always tell you the number of carbon atoms.

Answer:

False

Explanation:

Emectromagnetic waves are slowed down by even the most transparent of mediums.

Answer:

All of the Above

A.The number of reactants is the same as the number of products.

B.The compounds are the same on each side of the reaction.

C.The number of atoms of each element is the same on each side of the equation.

D.The state of matter is the same on each side of the equation.

Explanation:

Answer:

C

Explanation:

I did the test

A, 1.204x10²⁴ atoms of calcium would weigh approximately 8.014 grams.

To determine the weight in grams of 1.204x10²⁴ atoms of calcium, we need to use the molar mass of calcium and Avogadro's number.

The molar mass of calcium (Ca) will be approximately 40.08 g/mol. This will be found on the periodic table.

Avogadro's number (NA) is approximately 6.022 x 10²³ atoms/mol. It will represents the number of atoms or molecules in one mole of the substance.

Now we can calculate the weight in grams using the given number of atoms;

weight = (number of atoms) x (molar mass) / Avogadro's number

weight = (1.204x10²⁴ atoms) x (40.08 g/mol) / (6.022 x 10²³ atoms/mol)

Simplifying the calculation;

weight = (1.204 x 40.08) / 6.022 g

weight ≈ 48.255 / 6.022 g

weight ≈ 8.014 g

Therefore, 1.204x10²⁴ atoms of calcium would weigh approximately 8.014 grams.

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Answer:

You confirm the units involved, which would make you to understand the factors required.

Explanation:

Conversion of units is a process in which a given unit of a physical quantity is accurately transformed into another. Example, when the mass of a substance in grams is converted to kilograms. Or conversion of a given quantity of substance from liters to gallons.

When conversion is required, the first thing to do is to determine the units involved. That is, which unit do you want to convert to the required unit. This would give the understanding of the factors that are needed.

Answer:

Concentration gradient, size of the particles that are diffusing, and temperature of the system affect the rate of diffusion. Some materials diffuse readily through the membrane, but others require specialized proteins, such as channels and transporters, to carry them into or out of the cell.

Explanation:

Hopefully this helps :)

The correct exponential notation for Planck's constant is\(6.63\times10^{-34} Js\).

Explanation:

Given that,

Planck constant =\(6.626070\times10^{-34} Js\)

We need to find the correct exponential notation for Planck's constant

According to the given options,

In option (a) :

The given value in option is \(h= 6.62\times10^{34} J.s\)

In this option, the given value is in three significant figures but the negative sign is missing in the exponential term.

So, this is the incorrect option.

In option (b) :

The given value in question is \(6.626070\times10^{-34} Js\)

We write the value of the Planck constant with three significant figures.

The Planck constant with three significant figures will be

\(h=6.63\times10^{-34} Js\)

So, this is the correct option.

In option (c) :

The given value is \(h= 6.02\times10^{34} J.s\)

In this option, the given value is in three significant figures but this value is not the Planck constant value.

So, this is the incorrect option.

Hence, the correct exponential notation for Planck's constant is\(6.63\times10^{-34} Js\).

The correct option is (b).

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Answer:

chemical bonding

Explanation:

i hope this helped :)

Answer:

1653.21 cm

Explanation:

volume formula of rectangular prism is volume times height times width

40.1 times 4.457 times 9.25 = 1653.21

Answer:

The volume of cuboid is 1653.21 cm³

Step-by-step explanation:

GIVEN :

TO FIND :

USING FORMULA :

\(\quad{\star{\underline{\boxed{\sf{V_{(cuboid)} = lbh}}}}}\)

SOLUTION :

Substituting all the given values in the formula to find the volume of cuboid :

\(\quad{\longrightarrow{\sf{V_{(cuboid)} = lbh}}}\)

\(\quad{\longrightarrow{\sf{V_{(cuboid)} = l \times b \times h}}}\)

\(\quad{\longrightarrow{\sf{V_{(cuboid)} = 40.1 \times 4.457 \times 9.25}}}\)

\(\quad{\longrightarrow{\sf{V_{(cuboid)} = 178.7275 \times 9.25}}}\)

\(\quad{\longrightarrow{\sf{V_{(cuboid)} = 1653.21272}}}\)

\(\quad{\longrightarrow{\sf{V_{(cuboid)} \approx 1653.21}}}\)

\(\quad{\star{\underline{\boxed{\sf{V_{(cuboid)} = 1653.21 \: {cm}^{3}}}}}}\)

Hence, the volume of cuboid is 1653.21 cm³.

1) First, let's calculate the molar mass of NaCl and CoCl₂:

Atomic mass of:

Na - 22.99 g/mol

Cl - 35.45 g/mol

Co - 58.93 g/mol

So for NaCl:

22.99 + 35.45 = 58.44 g/mol

Molar mass of NaCl = 58.44 g/mol

For CoCl₂:

58.93 + (2x35.45) = 129.83 g/mol

Molar mass of CoCl₂: 129.83 g/mol

2) Now let's find out the number of moles of each sample. For this, we use the following equation:

moles = mass / molar mass

NaCl:

mole = 116.8 / 58.44

mole = 1.999 moles of NaCl

CoCl₂:

mole = 259.7 / 129.83

mole = 2.000 moles of CoCl₂

3) To find the amount of particles, we use the Avogadro's constant. Avogadro's constant is a constant of proportion between the amount of matter and the number of entities that are linked to that amount. These entities can be atoms, molecules, ions, electrons, protons, neutrons.

In this case, we have the same number of moles, so we will have the same number of particles for both NaCl and CoCl₂.

Answer:

d. Solid

Explanation:

It is frozen to be a glacier

Hope this helps :)

Answer: SnO2 + 2 H2 = Sn + 2 H2O

Explanation: I used a balance equation website. It's called WebQC if you want to check it out for future help.

Answer:

\( \huge{ \boxed{1.213 \: \text{moles}}}\)

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\( \bold{n = \frac{N}{L}} \\ \)

where

From the question

N = 7.30 × 10²³ NaCl molecules

\(n = \frac{7.30 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{7.30}{6.02} \\ = 1.2126\)

We have the final answer as

Answer:

250L

Explanation:

Data;

V1 = 200L

P1 = 10atm

T1 = 400K

T2 = 100K

P2 = 2atm

V2 = ?

To solve this question, we'll have to use the combined gas equation which is a combination of Boyle's law, Charles law and pressure law.

From combined gas equation,

(P1 × V1) / T1 = (P2 × V2) / T2

P1 × V1 × T2 = P2 × V2 × T1

Solve for V2,

V2 = (P1 × V1 × T2) / P2 × T1

V2 = (10 × 200 × 100) / (2 × 400)

V2 = 200,000 / 800

V2 = 250L

The final volume of the gas is 250L

The empirical formula of the original compound given the combustion analysis data is CH₂O

Mass of C = (12 / 44) × 51.29

Mass of C = 13.99 g

Mass of H = (2 / 18) × 20.99

Mass of H = 2.33 g

Mass of O = (mass of compound) – (mass of C + mass of H)

Mass of O = 35 – (13.99 + 2.33)

Mass of O = 18.68 g

Divide by their molar mass

C = 13.99 / 12 = 1.1658

H = 2.33 / 1 = 2.33

O = 18.68 / 16 = 1.1675

Divide by the smallest

C = 1.1658 / 1.1658 = 1

H = 2.33 / 1.1658 = 2

O = 1.1675 / 1.1658 = 1

Thus, the empirical formula of the compound is CH₂O

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