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The percent composition of oxygen in beryllium nitrate, Be(NO3)2 is  72.166%.

Percent composition is very straightforward. Percent composition indicates the percentage of each element in a compound by mass. A chemical compound is made up of two or more elements.

Percent composition is important because it allows us to calculate the percentage of each element in a compound. Here, the quantity is measured in terms of grams of the elements present.

For example, if we know the mass and chemical composition of a substance, we can find out the number of moles and calculate the number of atoms or molecules in the sample.

In  Be(NO3)2 the percent composition of Beryllium (Be) is 6.775%, Nitrogenium (N) is 21.060% and Oxygenium (O) is72.166%.

Thus, The percent composition of oxygen in beryllium nitrate, Be(NO3)2 is 72.166%.

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Answer:

Explanation:

Let the protein contained in pizza be m gram .

calories contained by 17 g of fat = 17 x 9  kcals = 153  kcals .

calories contained by 25 g of carbohydrate = 25 x 4  kcals = 100 kcals .

calories contained by m  g of protein  = m  x 4  kcals = 4 m  kcals .

Total calories of slice of pizza = 153 + 100 + 4m kcals

= 253 + 4m kcals

Given ,

253 + 4m = 750

4m = 497

m = 124.25 g .

120 g ( rounded to two significant  figures )

Answer:

They are resonance contributors

Explanation:

Resonance structures are structures that differ only in the distribution or placement of electrons.

Considering the two structures, we can easily see that the two species have the same total number of bonds and electrons differing only in the distribution of these electrons.

Hence, they are resonance contributors.

Answer:

Solar energy is essentially the light and heat emitted from the sun

Answer:

atomic number of phosphorous is 15. It has zero charges because it has equal number of protons and electrons

Explanation:

one if them is phosphate

Answer:

0.3 hours of oxygen use will be obtained from the 4.7 L tank.

Explanation:

The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them. That is, what is intended with it is to find the fourth term of a proportion knowing the other three.

To solve a direct rule of three, where a, b and c are known data and x is the value to be calculated  the following formula must be followed:

a ⇒ b

c ⇒ x

So [tex]x=\frac{c*b}{a}[/tex]

A value of 15 L/hour indicates that 15 L is consumed in 1 hour. The following rule of three can then be applied: if the average basal rate of oxygen consumption for an adult is 15 L in 1 hour, then 4.7 L in how long will it be consumed?

[tex]time=\frac{4.7 L*1 hour}{15 L}[/tex]

time= 0.3 hours

0.3 hours of oxygen use will be obtained from the 4.7 L tank.

Answer:The five major types of species interactions, summarized in Figure 10, are competition, predation, parasitism, mutualism, and commensalism.

Explanation:

Answer: See explanation

Explanation:

The International System of Units (SI), is also referred to as the metric system, and it is the standard for measurement internationally.

It should be noted that the The International System of Units (SI), originated from France. It is the system of measurement that is accepted officially worldwide. e.g. S.I unit for time is seconds.

Answer:

I believe it's chemical

Answer:

physical

Explanation:

it's not changing form or substance

Answer:

[tex]n_{Al}=6.00molAl\\\\n_{S}=9.00molS\\\\n_{O}=36.0molO[/tex]

Explanation:

Hello!

In this case, when analyzing the moles of an element inside a compound, we need to keep in mind that a mole ratio should be set up; thus, for aluminum sulfate, we have the following ones:

[tex]\frac{2molAl}{1molAl_2(SO_4)_3} \\\\\frac{3molS}{1molAl_2(SO_4)_3} \\\\\frac{12molO}{1mol1molAl_2(SO_4)_3}[/tex]

Thus, starting by 3.00 moles of aluminum sulfate, the moles of each element turn out:

[tex]n_{Al}=3.00molAl_2(SO_4)_3*\frac{2molAl}{1molAl_2(SO_4)_3} =6.00molAl\\\\n_{S}=3.00molAl_2(SO_4)_3*\frac{3molS}{1molAl_2(SO_4)_3} =9.00molS\\\\n_{O}=3.00molAl_2(SO_4)_3*\frac{12molO}{1molAl_2(SO_4)_3}=36.0molO[/tex]

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Answer:

Seven electrons.

Explanation:

There are seven valence electrons in each fluorine atom because it belongs to halogens. Fluorine atom requires one electron to complete its valence shell to become stable so for that it form both ionic and covalent bonds with different atoms. It makes ionic bond with alkali metals by accepting one electron to complete its valence shell and also make covalent bond by sharing of electrons.

Answer:

[tex]16.1\times 10^3\ \text{g}[/tex]

[tex]16.1\times 10^{6}\ \text{mg}[/tex]

[tex]16.1\times 10^{9}\ \mu\text{g}[/tex]

Explanation:

Mass of dog = [tex]16.1\ \text{kg}[/tex]

[tex]1\ \text{kg}=10^{3}\ \text{g}[/tex]

[tex]1\ \text{kg}=10^{6}\ \text{mg}[/tex]

[tex]1\ \text{kg}=10^{9}\ \mu\text{g}[/tex]

So,

[tex]16.1\ \text{kg}=16.1\times 10^3\ \text{g}[/tex]

[tex]16.1\ \text{kg}=16.1\times 10^{6}\ \text{mg}[/tex]

[tex]16.1\ \text{kg}=16.1\times 10^{9}\ \mu\text{g}[/tex]

Mass of the dog in the other units is [tex]16.1\times 10^3\ \text{g}[/tex], [tex]16.1\times 10^{6}\ \text{mg}[/tex] and [tex]16.1\times 10^{9}\ \mu\text{g}[/tex].

Answer:

oxygen

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Answer:

Sulfur

Explanation:

A non-metal in the third period that should have chemical properties similar to oxygen is sulfur.

This is because elements in the same group/family have similar chemical properties.

Answer:

plants

Explanation:

Explanation:

Metals usually have stronger electron affinity than non-metals:

In the periodic table, the trend of electron affinity is that it increases from left to right across the period and decrease down the group.

False

Noble gas elements have a very large value for electron affinity:

Electron affinity is the change in energy of an atom when an electron is added. Noble gases already have a complete octet configuration hence there is no reason to accept any electrons. This makes their electron affinity value less than or equal to zero.

False

Negative anions have a larger ionic radius than the atomic radius of their neutral atom:

Neutral atoms that gain electron are referred to as anions. The extra electron increases the electron-electron repulsion which pushes the electrons further apart and finally increased radius.

True

Answer:

53.31g of FeCl3

Explanation:

The equation of the reaction is given as;

2Fe(s)  + 3Cl2(g) --> 2FeCl3(s)

From the stochiometry of the reaction;

2 mol   :    3 mol       :   2 mol

112g     :      213g      :     324.4g

Converting the masses given to moles;

Number of moles of Fe = mass / molar mass = 22.5 / 56 = 0.4018

Number of moles of Cl2 = mass / molar mass = 35 /  71 = 0.4930

In this reaction, the limiting reactant is Cl2

213 g of Cl2 produces 324.4g of FeCl3,

35g of Cl2 would produce xg of FeCl3

213 = 324.4

35 = x

x = (35 * 324.4) / 213 = 53.31g

Answer:

See explanation

Explanation:

For Fe;

Fe2+(aq) + 2H+(aq) + S2-(aq) ----> FeS(s) + H2(g)

For Ni

Ni2+(aq) + 2H+(aq) + S2-(aq) ----> NiS(s) + H2(g)

For Cr

2Cr3+(aq) + 6H+(aq) + 3S2-(aq) ----->Cr2S3(s) + 3H2(g)

We must remember that in writing these equations, the number of electrons lost or gained must be balanced. The number of electrons lost by the metal must equal the number of electrons gained by hydrogen. This rule was followed in writing all the equations above.

Answer:

1.09 × 10⁻⁷ m

UV region

Explanation:

Step 1: Given and required data

Energy of the photon of light (E): 1.83 × 10⁻¹⁸ J

Planck's constant (h): 6.63 × 10⁻³⁴ J.s

Speed of light (c): 3.00 × 10⁸ m/s

Step 2: Calculate the wavelength (λ) of this photon of light

We will use the Planck-Einstein's relation.

E = h × c/λ

λ = h × c/E

λ = 6.63 × 10⁻³⁴ J.s × (3.00 × 10⁸ m/s)/1.83 × 10⁻¹⁸ J = 1.09 × 10⁻⁷ m

This wavelenght falls in the UV region of the electromagnetic spectrum.

Answer:  It is more difficult to remove a valence electron from a Chlorine (Cl) atom

Explanation:

Ionization energy is the energy required to remove the valence electron from an isolated gaseous atom.

Magnesium (Mg) is the 12th element of periodic table and has an atomic number of 12. The electronic configuration is 2, 8, 2. It can easily lose its valence 2 electrons to attain stable configuration.

Chlorine (Cl) is the 17th element of periodic table and has an atomic number of 17. The electronic configuration is 2, 8, 7. It has a tendency to gain electron to attain stable configuration. It cannot lose its valence electron easily as the valence electrons experience more nuclear charge.

Thus it is more difficult to remove a valence electron from a Chlorine (Cl) atom

Chlorine(Cl) is the more difficult to remove a valence electron from which is

because it needs one electron to achieve a stable octet configuration.

Magnesium (Mg) is an element which has an atomic number of 12. The

electronic configuration is 2, 8, 2. This means it has to lose its  2 valence

electrons needed to attain a stable octet configuration.

Chlorine (Cl) is an element which has an atomic number of 17. The electronic

configuration is 2, 8, 7. This means it has to gain one valence electrons

needed to attain a stable octet configuration.

Thus it is more difficult to remove a valence electron from a Chlorine (Cl)

atom than Magnesium atom.

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Answer:

1 mole of any ideal gas occupies the same volume as one mole of any other ideal gas under the same conditions of temperature and pressure.So 1 L CO2 has same number of moles as 1 L O2 and 1 L N2 etc.This means that, assuming all the gases in air are ideal gases, if CO2 is 4.0 % by volume then it is also 4.0 % by moles, because a volume of each gas has the same number of moles.

Explanation:

Answer:

NaNO₃

Explanation:

Data obtained from the question include:

Mass of sodium (Na) = 3.47 g

Mass of nitrogen (N) = 2.12 g

Mass of oxygen (O) = 7.27 g

Simplest (empirical) formula =?

The simplest formula for the salt can be obtained as follow:

Na = 3.47 g

N = 2.12 g

O = 7.27 g

Divide by their molar mass

Na = 3.47 / 23 = 0.151

N = 2.12 / 14 = 0.151

O = 7.27 / 16 = 0.454

Divide by the smallest

Na = 0.151 / 0.151 = 1

N = 0.151 / 0.151 = 1

O = 0.454 / 0.151 = 3

Simplest formula = NaNO₃

Thus, the simplest formula for the salt is NaNO₃

Answer:

Yes

Explanation:

Jupiter is a very large planet. Larger planets usually have stronger gravity, which pulls planets toward each other.

The moons of Jupiter are by Jupiter. (I know, that wasn't a smart thing to say because you know that, but, hey, I had to.) With this being the case, Jupiter is also an inside planet.

- Inside Planets

Planets that are closest to the sun and orbits the sun

There are 2 things that are the cause of the moons of Jupiter not being pulled by earth.

1. Jupiter has strong gravity which pulls the moons, and Jupiter is being pulled by the sun's INCREDIBLE gravity.

2. Earth is an outside planet. It is too far away from Jupiter to attract Jupiter's moons.

- Outside Planet

A planet that is away from the sun, but still orbits the sun

Hope this helps! :D

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Yes, The moons of Jupiter orbit Jupiter because they are pulled toward Jupiter. The moons of Jupiter are too far to be pulled into Earth'orbit.

A planet's orbit around a star, a natural satellite's orbit around a planet, or an artificial satellite's orbit around a space object or location like a planet, moon, asteroid, or Lagrange point are all examples of curved objects that follow this path.

A planet's orbit around a star, a natural satellite's orbit around a planet, or an artificial satellite's orbit around a space object or location like a planet, moon, asteroid, or Lagrange point are all examples of curved trajectories in celestial mechanics known as orbits.

Around a star, a natural satellite's orbit around a planet, or an artificial satellite's orbit around a space object or location like a planet, moon, asteroid, or Lagrange point are all examples of curved objects that follow this path.

Yes, The moons of Jupiter orbit Jupiter because they are pulled toward Jupiter. The moons of Jupiter are too far to be pulled into Earth'orbit.

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Answer:

25.8 g C6H12O6

Explanation:

Answer:

c. the amount of fossil fuels being burned increased

Explanation:

Carbon dioxide gas concentration increased over the time due to burning of fossil fuels increased. Fossil fuels are organic compounds which releases carbondioxide gas as a result of burning of fossil fuels in the engines of vehicles and industries. With the passage of time, number of vehicles increases in the world which needs more fossil fuels and due to burning of that fossil fuels, more carbondioxide gas is released.

Answer:

Explanation:

The plant cell has a cell wall, chloroplasts, plastids, and a central vacuole—structures not found in animal cells. Plant cells do not have lysosomes or centrosomes.