Nitrogen (N) Is Element Number 7 In The Periodic Table. It Has A Mass Number Of 14. Nitrogenhas Gained (2024)

Answer:

C

A

B

Explanation:

Excess reactant: Reactant that has some left over at the end of the reaction

Limiting reactant: Reactant that is entirely used up in the reaction

Theoretical yield: Mass of product that can be made by the given masses of reactants

The terms have been correctly matched to their descriptions as follows:

Limiting reactant: b) Reactant that is entirely used up in the reaction.Theoretical yield: c) Mass of product that can be made by the given masses of reactants.Excess reactant: a) Reactant that has some leftover at the end of the reaction.

What is a Reactant?

A reactant is a chemical compound or element that participates in a chemical reaction.

The limiting reactant is completely used up after the reaction while the excess reactant is the compound or element that is much more than what is normally required to complete the reaction.

The theoretical yield is the maximum quantity of the product that can be formed by the reactants.

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Answer:

The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first objectequalsthe size of the force on the second object. The direction of the force on the first object isoppositeto the direction of the force on the second object. Forcesalwayscome in pairs - equal and opposite action-reaction force pairs.

Explanation:

The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first objectequalsthe size of the force on the second object. The direction of the force on the first object isoppositeto the direction of the force on the second object. Forcesalwayscome in pairs - equal and opposite action-reaction force pairs.

Answer:

independent variable: a variable (often denoted by x ) whose variation does not depend on that of another.

dependent variable: a variable (often denoted by y ) whose value depends on that of another.

Explanation:

Answer:

I hope this helps

Explanation:

Lewis symbols, which are also known as Lewis dot diagrams or electron dot diagrams, are diagrams that represent the valence electrons of an atom. Lewis structures, also known as Lewis dot structures or electron dot structures, are diagrams that represent the valence electrons of atoms within a molecule.

Answer:

The answer is 8.96 g/cm³

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

From the question we have

[tex]density = \frac{89.6}{10} \\ [/tex]

We have the final answer as

8.96 g/cm³

Hope this helps you

Answer:

≈0.56 moles or ≈3.37⋅ 10 23 atoms

Explanation:

Answer: D

Explanation:

Amorphous

Answer:D

Explanation:

took the apec test

Answer:

The answer is option C

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question

volume of liquid = 15 mL

density = 2.5 g/mL

We have

mass = 15 × 2.5

We have the final answer as

37.5 g

Hope this helps you

Answer:

where are the solid blocks?

Explanation:

Answer:

It's actually C

Explanation:

The Ice's mass was never destroyed, just converted therefore it would be C, which states the mass never disappeared, just changed to water.

A sample of oxygen gas at STP is depicted in the diagram in the picture (4) of the image attached.

What is an oxygen molecule?

An oxygen molecule is a diatomic molecule, which is a molecule made up of just two atoms of the same element. The oxygen molecule in this instance is made up of two oxygen atoms.

If you have a lot of oxygen atoms at STP, they will spontaneously combine to produce O₂ because double bonds between oxygen atoms make their structure more stable.

If we carefully examine the figure in the attached image, we will see that it depicts a molecule made up of two atoms of the same element, which perfectly matches the definition of the oxygen molecule.

Therefore, this is shown in diagram (4), spontaneously combine to produce O₂ because double bonds between oxygen atoms make their structure more stable.

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Answer:

60 hours

Explanation:

18.0 __15__ 9 __15__ 4.5 __15__ 2.25 __15__ 1.125g

15(4)= 60

Sodium-24 has a half-life of approximately 15 hours. If only one-eighth of the sodium-24 remain , then it has been passed in 60 hours. So option D is correct.

What is half life and decay law ?

The time required for half of the original population of radioactive atoms to decay is called the half-life. The relationship between the half-life, T₁ ÷ 2, and the decay constant is given by T₁/2 = 0.693/λ

According to radioactive decay law, the rate of decay of radioactive atoms at any instant is directly proportional to the number of atoms present at that instant.

dtd N ∝ N

dtd N = λ N

where, N is number of integrated nucleus present in the sample at any time t and λ is decay constant.

Thus ,option D 60 hours is correct.

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Answer:

The heating element is near the bottom of the kettle because of the way it heats up the water. The water is heated through the flow of electricity meeting resistance in the form of the element.

Explanation:

Answer:

because it is a theory

Explanation:

The best explanation for why scientific theories are modified is simply because it is a theory. Theories are created as a set of suppositions that help humanity understand something that would otherwise be unexplainable. Since they are not proven through scientific facts but instead are more of ideas that help further our understanding of a phenomenon, they tend to be modified as new ideas are introduced and others are proven to be false/wrong.

Answer: The third one, changes can occur to physical properties but the chemical composition remains the same.

Explanation: Chemical changes change the chemical composition. Physical changes do not.

Answer:

yess

Explanation:

Answer:

4.50 L gas of fluorine at STP contain 0.2 moles.

Explanation:

Given data:

Volume of gas = 4.50 L

Number of moles F₂ gas = ?

Temperature of gas = standard = 273.15 K

Pressure of gas = standard = 1 atm

Explanation:

Formula:

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K

T = temperature in kelvin

Now we will put the values in formula.

1 atm × 4.50 L = n × 0.0821 atm.L/ mol.K × 273.15 K

4.50 atm.L = n × 22.43 atm.L/ mol.

n = 4.50 atm.L / 22.43 atm.L/ mol.

n = 0.2 mol

4.50 L gas of fluorine at STP contain 0.2 moles.

Answer:

B. A net positive charge

Explanation:

a p e x 2021!

Answer:

Iron have 26 atomic and sodium have 11 atomic

Explanation:

The sodium is a non-transition metal. Its melting point is low and boiling points and is a soft metal, whereas iron is a transition metal with very high melting and boiling points, It is a hard metal.

What is transition metal ?

The term transition metal is defined as any of various metallic elements such as chromium, iron, and nickel that have valence electrons in two shells instead of only one.

Between the s-block and p-block elements in the periodic table are transition metals. As a result, they are known as d-block elements.

Sodium is soft, has a much lower melting point than water, and reacts with it violently, producing heat and hydrogen or even exploding. Additionally, sodium and water react to create a hazardous compound.

Thus, these are difference between the properties of sodium and iron.

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Answer:

Black holes are so dense that light cannot escape from them, and they are difficult to detect. Satellites above the Earth's atmosphere can detect bursts of high energy radiation given off by black holes. Dozens of stellar black holes have already been detected in the Milky Way, where there may be tens of millions more.

Explanation:

Answer:

Monosaccharides are the most basic units of carbohydrates. These are simple sugars, including glucose, fructose, and others. They contain between three and seven carbon atoms, have a sweet taste and are used by the body for energy.

Answer:

Explanation:

boiling

According to the forces of attraction, boiling takes place when the kinetic energy of molecules overcomes the intermolecular forces.

What are forces of attraction?

Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.

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Answer:

D

Explanation:

More protons in the nucleus pull the electrons in, making the atomic radius smaller. Therefore, the correct option is option D.

The atomic radius is determined by the nucleus's balance between the attracting force of positively charged protons and the repelling force of electrons.

The most crucial element in calculating the average atomic radius is not Option A. Although atomic mass typically increases with time, increasing nuclear charge has a greater impact on atomic size.

Over time, Option B has no discernible impact on atomic radius. Although the number of valence electrons changes over time, increasing nuclear charge has the biggest impact on atomic size. The valence shell is the outermost electron shell.

The gradual decrease in atomic radius is unaffected by Option C. The most frequent electron pairing occurs within orbitals of the same energy level, and it has little impact on atomic size over a period.

Therefore, the correct option is option D.

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Answer:

Isotopesof any givenelementallcontain the samenumber of protons, so theyhave the same atomicnumber (for example, theatomicnumber of helium is always 2).Isotopesof a givenelement contain differentnumbers of neutrons, therefore,different isotopes have differentmass numbers.

The atomic size of an element significantly depends on the number of protons. It is the characteristic property of isotopes that they possess the same number of protons which is responsible for the same atomic size.

What are Isotopes?

Isotopes may be defined as one of two or more species of atoms of a chemical element that have the same atomic number and location in the modern periodic table with identical chemical behavior but with different atomic masses and physical properties.

In a more simple sense, isotopes are those elements that have the same atomic number but different atomic mass. The atomic number depends on the number of protons which remains constant in isotopes. So, the isotopic elements have identical atomic sizes.

Therefore, the isotopes of the same element have the same atomic size.

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Answer:

12 grams

Explanation:

For any radioactive substance

the amount of substance left after n half life is given by = [tex]x/2^n[/tex]

where x the original amount of substance.

____________________________________________

Half life of isotope Np-238 = 2 days

total no of days = 6

no of half life =total no of days/Half life of isotope Np-238 = 6/2 = 3

thus,

for our problem n = 3

initial amount of Np-238 = 96 grams

thus,

the amount of substance left after 3 half life = 96/2^3 = 96/8 = 12 grams.

Thus, 12 grams will be left after six days.

Answer:

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Answer:

F₂ = 3.97 F₁

Hence, the force will be increased by a factor of 3.97

Explanation:

The force between the ball and the bowling pin is given by Newton's Gravitational Law, as follows:

F = Gm₁m₂/r²

where,

F = Force

G = Gravitational Constant

m₁ = mass of ball

m₂ = mass of bowling pin

r = distance between ball and bowling pin

So, initially:

F₁ = G(3.6 kg)(1.36 kg)/r²

F₁ = 4.896 G/r²

After increase in masses:

F₂ = G(7.2 kg)(2.7 kg)/r²

F₂ = 19.44 G/r²

F₂/F₁ = (19.44 Gr²)/(4.896 G/r²)

F₂ = 3.97 F₁

Hence, the force will be increased by a factor of 3.97

Answer:

What is your body made of? Your first answer may be that it is made up of different organs like the heart, lungs, and stomach, which work together to keep it going. Or you could go even closer and say that it is made of many types of cells. However, at the most basic level, your body — and indeed, all life, like everything that is not alive — is made up of atoms, often organized into larger structures called molecules

Explanation: