Which of the following on the periodic table corresponds to a principal energy level?
Group of answer choices

representative elements

transition elements

group

period

Explanation:

require an emergency support immediately

Answer:

a) cH4(g) +2O(g)__ CO2(g) +2H2O(g)

I hope this help

Answer:

34.8 mL

Explanation:

First we convert 5.48 g of CuNO₃ into moles, using its molar mass:

Now we can calculate the volume of the solution, using the definition of molarity:

Finally we convert L into mL:

Answer:

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Explanation:

Answer:

Cycle

Explanation:

Answer:

Explanation:El mol es una unidad conveniente de usar debido a la gran cantidad de átomos, moléculas u otros en cualquier sustancia.

Answer:

Unbalanced

Explanation:

The reactants side says 2Na. This means there should also be 2Na on the product's side. However, there is only 1 Na there. Therefore, the chemical equations are unbalanced.

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Answer:

0.468 m

Explanation:

From the question given above, the following data were obtained:

Mass of napthalalene (C₁₀H₈) = 30 g

Mass of toulene = 500 g

Molality =?

Next, we shall determine the number of mole in 30 g of C₁₀H₈. This can be obtained as follow:

Mass of C₁₀H₈ = 30 g

Molar mass of C₁₀H₈ = (12×10) + (8×1)

= 120 + 8

= 128 g/mol

Mole of C₁₀H₈ =?

Mole = mass / molar mass

Mole of C₁₀H₈ = 30 / 128

Mole of C₁₀H₈ = 0.234 mole

Next, we shall convert 500.0 g of toulene to Kg. This can be obtained as follow:

1000 g = 1 Kg

Therefore,

500 g = 500 g × 1 Kg / 1000 g

500 g = 0.5 Kg

Finally, we shall determine the molality of the solution. This can be obtained as follow:

Mole of solute (C₁₀H₈) = 0.234 mole

Mass of solvent (toulene) = 0.5 Kg

Molality =?

Molality = mole of solute / Kg of solvent

Molality = 0.234 / 0.5

Molality = 0.468 m

Protons and neutrons are particles that make up the dense nucleus at the center of an atom. Protons have a positive electric charge, and neutrons have no electric charge (i.e., neutrons are electrically neutral).

Electrons are particles that are found surrounding the nucleus; electrons have a negative electric charge.

The magnitude of a proton's positive charge and an electron's negative charge are equal in magnitude. All they differ in is in their polarity.

So, an atom that has the same number of protons and electrons would be electrically neutral. An ion is an atom that has a non-neutral charge because of an imbalance between the number of protons and electrons. If there are more electrons than protons, there is a net negative charge, and this type of ion is called an anion; if there are fewer electrons than protons, there is a net positive charge, and this type of ion is called a cation.

In this case, we have an element (or, more precisely, an atom of an element) that has 35 protons, 36 electrons, and 45 neutrons. There is one more electron than there are protons. This is called an anion because there are fewer electrons compared to protons.

Considering the definition of ion, cation and anion, this is called an anion  because there are  more electrons compared to protons.

All atoms are composed of a central nucleus in which there are particles with a positive electric charge, the protons, around which other particles with a negative electric charge that are electrons move. Thus, the atom is electrically neutral, since the positive charge of the protons is compensated by the negative charge of the electrons.

On the other hand, an ion is a particle with an electrical charge obtained by adding or removing electrons from atoms or molecules.

An electron-deficient atom or molecule has a positive charge and is called a cation; On the other hand, when there are excess electrons, the ion has a negative charge and is called an anion.

In other words, if an atom, or atoms, does not have a balanced number of negatively charged electrons and positively charged protons, these species will be charged and are called ions.

A cation has more protons than electrons, giving it a net positive charge. For a cation to form, one or more electrons must be lost.

An anion has more electrons than protons, which gives it a net negative charge. For an anion to form, one or more electrons must be gained.

In this case, an element has 35 protons, 36 electrons, and 45 neutrons. This is called an anion  because there are  more electrons compared to protons.

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Answer:

A. 15

Explanation:

From the equation we see that 6 water particles are used to make 1 particle of the hexose.

That means, that to make 1 mole of the hexose, we need 6 moles of water (as a mole is an unit of count of particles).

To make 2.5moles of the hexose, we need 2.5*6 moles of water, so 15 moles of water.

Answer:

The following numbers are true for protons:

2.

5.

7.

Explanation:

I know for a fact that Protons have a positive charge

they are located inside of the nucleus

Go.ogle says that they aren't involved in bonding

And it says that it has a mass of one

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Answer:

As food passes through the GI tract, it mixes with digestive juices, causing large molecules of food to break down into smaller molecules. The body then absorbs these smaller molecules through the walls of the small intestine into the bloodstream, which delivers them to the stomach

Answer:

Food contents that the animal or creature has swallowed goes into the stomach. The contents gets broken down. The energy from the contents will then go through the body.

Answer:

The appropriate alternative is option C "[tex]5.09\times 10^{14} \ s[/tex]".

Explanation:

The given value is:

Energy of photon,

E = [tex]3.37\times 10^{-19} \ J[/tex]

As we know,

h = [tex]6.626\times 10^{-34} \ Js[/tex]

Now,

The frequency of the light will be:

⇒  [tex]E=hv[/tex]

On substituting the given values, we get

⇒  [tex]3.37\times 10^{-19}=6.626\times 10^{-34}\times v[/tex]

On solving, we get

⇒                    [tex]v=5.09\times 10^{14} \ s[/tex]

If the energy of a photon of light is 3.37 x 10⁻¹⁹ J, then the frequency of the light is 5.09 x 10¹⁴ per sec.

Frequency of light will be calculated by using the below formula:
E = hυ, where

E = energy of photon = 3.37 x 10⁻¹⁹ J

h = plank's constant = 6.626 × 10⁻³⁴ Js

Putting these values on the above equation and calculate for the frequency as:

υ = 3.37 x 10⁻¹⁹ J / 6.626 × 10⁻³⁴ Js = 5.09 x 10¹⁴ per sec

Hence, option (C) is correct i.e. 5.09 x 10¹⁴ per sec.

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Answer: 1.08×10^24 atoms

Answer: the answer would be B

Answer:

0.0500

Explanation:

Radiation from alpha decay has the least energy.

Alpha decay is the name for the nuclear process that releases alpha particles. Two protons that were lost by the uranium atom are present in the alpha particle. Additionally, the two protons have a +2 charge. The particle's mass, or the sum of its protons and neutrons, is represented by the top number, 4, in this case. Alpha particles must also have two neutrons because they have two protons, making a total of four protons and neutrons. Two protons and two neutrons are the constant components of alpha particles.

A nuclear process known as "alpha decay" releases a particle made up of two protons and two neutrons when an unstable nucleus transforms to another element. The helium nucleus that is being ejected is known as an alpha particle.

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Answer:

C) Alpha decay

Explanation:

Alpha decay, beta decay, electromagnetic decay, Gamma decay

its least to greatest

Answer:

b. proton

Explanation:

The mass of an electron is only about 1/2000 the mass of a proton or neutron, so electrons contribute virtually nothing to the total mass of an atom. Electrons have an electric charge of −1, which is equal but opposite to the charge of a proton, which is +1.

Answer:

[tex]1.26*10^2^4[/tex]

Explanation:

To find molecules, we will need to multiply the number of moles of carbon monoxide by Avogadro's number. Avogadro's number is [tex]6.022*10^2^3[/tex].

So the equation would look like this:

[tex](2.1) * (6.022*10^2^3) = 1.26 *10^2^4[/tex]

Answer:

82.24% percent composition of N and 17.76% percent composition of H .

Explanation:

The Light Is- Electric To Radiant

Car Battery- Chemical To Electric

Wind Thingy- Motion To Electric

Fan- Electric To Motion

Guitar- Electric To Sound

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Answer:

Pppppppp pppppppp pppppppp pppppppp

Answer:

4.52 grams of potassium chloride

Explanation:

First you need a balanced reaction equation K(s) + Cl₂ (g) --> 2 KCl(s). Since the chlorine gas is said to be in excess all of the potassium will be converted to form potassium chloride. Convert grams of potassium to moles of potassium with the periodic table, then you can convert moles of potassium to moles of potassium chloride with the balanced equation, finally convert moles of potassium chloride to grams of potassium chloride with the periodic table. Set up a dimensional analysis chart to help with conversions

(2.50 grams K) * (1 mole K)      * (2 mole KCl)   *   (35.45 grams KCl)

                       (39.09 grams K)      (1 mole K)             (1 mol KCl)

Which equals 4.52440778 grams, with sig figs it should be 4.52 grams of potassium chloride

Answer: K L M. 2 8 6.

Explanation: