a.
Neutrons have a neutral charge, a mass of 1 amu, and are found in an atom's ______

b.
Protons are a little smaller than neutrons, they still have a mass of 1 amu though. They are found inside an atom's nucleus and carry a
_______ charge.

C.
Electrons almost have no mass, it's so small we say it is 0 amu. They sail around the nucleus in the _______ They have a ______
charge.

The north pole of one magnet is near the South pole of the other magnet.

The ends of a magnet are called its poles. One end is called the north pole, the other is called the south pole. If you line up two magnets so that the south pole of one faces the north pole of the other, the magnets will pull toward each other.

If 2.54 g of PbS is burned with 1.88 g of O2, approximately 2.20 grams of Pb will be produced.

The balanced equation for the reaction of lead sulfide (PbS) with oxygen (O2) to produce lead (Pb) and sulfur dioxide (SO2) is as follows:

2PbS + 3O2 -> 2Pb + 2SO2

From the balanced equation, we can see that the stoichiometric ratio between PbS and Pb is 2:2 or 1:1. This means that for every 1 mole of PbS, 1 mole of Pb is produced.

To calculate the number of moles of PbS, we need to divide the given mass (2.54 g) by its molar mass:

Molar mass of PbS = 207.2 g/mol (Pb) + 32.07 g/mol (S) = 239.27 g/mol

Moles of PbS = 2.54 g / 239.27 g/mol = 0.0106 mol

Since the stoichiometric ratio between PbS and Pb is 1:1, the number of moles of Pb produced is also 0.0106 mol.

To calculate the mass of Pb, we multiply the number of moles by its molar mass:

Molar mass of Pb = 207.2 g/mol

Mass of Pb = 0.0106 mol x 207.2 g/mol = 2.20 g

This calculation is based on the stoichiometric ratio between PbS and Pb, where 1 mole of PbS produces 1 mole of Pb. By converting the given mass of PbS to moles and then multiplying by the molar mass of Pb, we can determine the mass of Pb produced.

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When hydrogen bromide (HBr) is added to 2-methylbut-2-ene ((CH3)2CCHCH3), an electrophilic addition reaction takes place, where the π bond of the alkene is broken, and the hydrogen and bromine atoms are added to the resulting carbocation.

The reaction proceeds through a Markovnikov addition, where the hydrogen atom attaches to the carbon atom with the greater number of hydrogen atoms.

In this case, the initial addition of HBr to 2-methylbut-2-ene leads to the formation of a primary carbocation, as the positively charged carbon atom only has one alkyl group attached to it. The primary carbocation is relatively unstable, and it can undergo a rearrangement to form a more stable secondary carbocation.

The major product that is typically obtained is the 2-bromo-2-methylbutane. The hydrogen atom from HBr adds to the carbon with three hydrogen atoms (the more substituted carbon), resulting in the formation of a secondary carbocation.

On the other hand, a minor product is also formed, which is 3-bromo-2-methylbutane. This product arises from the addition of HBr to the primary carbocation, which is less stable. Although the primary carbocation is less favored, it can still be formed and lead to the formation of the minor product.

In summary, the addition of HBr to 2-methylbut-2-ene yields two products: the major product is 2-bromo-2-methylbutane, resulting from the addition of HBr to the more stable secondary carbocation, and the minor product is 3-bromo-2-methylbutane, originating from the less stable primary carbocation.

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Answer:

+3

Explanation:

NH₄F

=> N + 4H + F = 0

=> N + 4(+1) + 1(-7) = 0

=> N = 7 - 4 = +3

The percent composition of CuBr₂ is approximately 28.46% of Cu and 71.54% of Br.

To determine the percent composition of CuBr₂ (copper(II) bromide), we need to calculate the mass of each element in the compound and then divide it by the molar mass of the entire compound.

The molar mass of CuBr₂ can be calculated by adding up the atomic masses of copper (Cu) and bromine (Br) in the compound. The atomic masses of Cu and Br are approximately 63.55 g/mol and 79.90 g/mol, respectively.

Molar mass of CuBr₂ = (63.55 g/mol) + 2(79.90 g/mol) = 223.35 g/mol

Now, let's calculate the percent composition of each element in CuBr₂:

Percent composition of copper (Cu):

Mass of Cu = (63.55 g/mol) / 223.35 g/mol × 100% ≈ 28.46%

Percent composition of bromine (Br):

Mass of Br = 2(79.90 g/mol) / 223.35 g/mol × 100% ≈ 71.54%

Therefore, the percent composition of CuBr₂ is approximately:

- Copper (Cu): 28.46%

- Bromine (Br): 71.54%

These values represent the relative mass percentages of copper and bromine in the compound CuBr₂.

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Test forensic investigators can use to test for human or animal blood will be

required to test the statement.

These are different tests and techniques used by appropriate body to

investigate a crime in order to know what really happened and who is

responsible.

The test which can be used to differentiate between human and animal

blood is Precipitin Test.  This is done by identifying the presence of proteins

that are found only in human blood such as albumin.

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the ph is gonna be your value and the 4 is gonna be your main subject

so as the ph is your value u gonna ad your ph and 7 and 4 toghter then multiple your answer 2 times  because ph represent multiple and your value  

Answer:

belonging or relating to a particular area or neighborhood, typically exclusively so

Explanation:

Answer:

Solid form of water is solidification

Answer:

D

Explanation:

Took the test!

Gluons act as exchange particles and are known as gauge bosons. They are involved in the forces within the atom as a strong nuclear force that binds the nucleus. Thus, option D is correct.

A strong nuclear force is a type of interaction that is present inside the atom and involves the nucleus. They bind the quarks to make the neutron and the proton, sub-atomic particles.

The strong nuclear force holds the atomic nucleus together and depends on the spin but not the charge. These forces are due to the interaction between the gluons and are stronger than the chemical bonds. The exchange of the mesons results in nucleons that lead to a strong nuclear force.

Therefore, option D. the gluons are responsible for the strong nuclear forces that bind the nucleus.

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Answer:

Fact: There’s only one letter that doesn’t appear in any U.S. state name

And that is Q

Explanation:

Final enthalpy for 0.600 moles of H₂O(g) is given as ΔH = -407 kJ

Given reaction is as follow,

  BH₃(g) + 3O₂(g) → B₂H₂(g) + 3H₂O(g)

Now,

  We need to find final enthalpy change (ΔH) for 0.600 moles of H₂O(g).

Again,

We know that change in enthalpy is an extensive property or in other words, ΔH is directly proportional to the moles of reactant.

For 3 moles of H₂O(g) , ΔH= -2035kJ

For 0.600 moles of H₂O(g) , ΔH = -2035 × 0.600/3

                                                    ΔH = -407 kJ

Thus from the above conclusion we can say that , final enthalpy for 0.600 moles of H₂O(g) is given as ΔH = -407 kJ

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Answer:

More energy is released from the old substance than the new substance needs to form its chemical bonds

Explanation:

Chemical A and Chemical B react in an exothermic reaction. When Chemical A and Chemical B are mixed together more energy will be released from the old substance than the new substance will need to form its chemical bonds. Therefore, option B is correct.

When a chemical reaction goes on, energy is shifted to or from the surroundings. When energy is moved to the surroundings, this is called an exothermic reaction, and the temperature of the surroundings increases.

Examples of exothermic reactions are combustion reactions and many oxidation reactions.

A chemical reaction is exothermic if heat is passed by the system into the surroundings. Because the surroundings are deriving heat from the system, the temperature of the surroundings increases.

Thus, option B is correct.

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The quantity of protons, neutrons, and electrons that each element has makes it unique.

Each chemical element's atoms has the same number of protons and electrons, which is important because neutrons' quantities are variable.

Isotopes are atoms with the same number of protons but differing numbers of neutrons.

They differ in mass, which affects their physical characteristics even if they have nearly identical chemical properties. There are unstable isotopes that emit radiation as well as stable isotopes that do not. These are referred to as radioisotopes.

Thus, The quantity of protons, neutrons, and electrons that each element has makes it unique.

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Answer:

That would be sodium chloride! I hope this helps! :)

Answer:

What is the mass of 1 mole of iron atoms?

Since iron has an atomic mass of 55.847 amu, one mole of iron atoms weighs 55.847 grams.

Explanation:

Got this answer from Angelo State University website.

Taking into account the reaction stoichiometry, 1.83 moles of Fe₂O₃ will react with 99.0 g of Al

In first place, the balanced reaction is:

2 Al + Fe₂O₃ → Al₂O₃ + 2 Fe

By reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

It is possible to use a simple rule of three as follows: If by reaction stoichiometry 54 grams of Al react with 1 mole of Fe₂O₃, 99 grams of Al react with how many moles of Fe₂O₃?

moles of Fe₂O₃= (99 grams of Al ×1 mole of Fe₂O₃)÷54 grams of Al

moles of Fe₂O₃= 1.83 moles

Finally, 1.83 moles of Fe₂O₃ is needed.

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Answer:

1) Element is a pure substance consisting only of atoms that all have the same numbers of protons in their nuclei.

2) a) Element is a pure substance

  b) It is homogeneous

3) Bromine

4) Elements and compounds are pure chemical substances found in nature. The difference between an element and a compound is that an element is a substance made of same type of atoms, whereas a compound is made of different elements in definite proportions. Examples of elements include iron, copper, hydrogen and oxygen.

5) The law of definite proportions

Explanation:

This is all i know, bro

The Electronegativity Difference between the C and H atoms in ethane would be 0.35.

The structure of ethane is as follows:A) Electronegativity of Carbon (C) is 2.55, and Hydrogen (H) is 2.20.  Electronegativity Difference (ΔEN) = 2.55 - 2.20 = 0.35B) There would be a partial negative charge on the Carbon atom, and there would be a partial positive charge on the Hydrogen atoms.C) The ethane molecule is less polar than water. This is because the electronegativity difference between the Carbon and Hydrogen atoms is low (0.35) in ethane, whereas the difference between the Oxygen and Hydrogen atoms is high (1.4) in water. Due to the high electronegativity difference in water, it creates a dipole moment, making it a polar molecule. Whereas ethane has no dipole moment and is considered a nonpolar molecule.D) If the oceans were filled with ethane instead of water, then there would be no hydrogen bonding. As a result, many of the physical properties of the ocean would be different.

For example, the freezing point of the ocean would be much lower because of the weak intermolecular forces between ethane molecules. Due to the absence of hydrogen bonding, the viscosity of the oceans would be less than that of water, leading to easier movement of organisms.

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Answer:

I think that gravity can be considered a force.

Explanation:

As the object falls, it moves faster and faster. Gravity is considered a universal force because it acts between any two masses anywhere in the universe. For example, there is a gravitational pull between the Sun and the Moon. Even small masses attract one another.

Hope this helped! :)

Answer:

5.29kg

Explanation:

5.29kg

The mass of 4.87×10²⁵ atoms of Zn is 5.29 Kg

From Avogadro's hypothesis,

Recall,

1 mole of Zn = 65.38 g

Converting 65.38 g to Kilogram (Kg), we have:

1000 g = 1 Kg

Therefore,

65.38 g = 65.38 / 1000

Thus, we can say that,

Finally, we shall determine the mass of Zn that contains 4.87×10²⁵ atoms. This can be obtained as follow:

6.02×10²³ atoms = 0.06538 Kg of Zn

4.87×10²⁵ atoms = \(\frac{4.87*10^{25} * 0.06538}{6.02*10^{23} } \\\\\)

Therefore, the mass of 4.87×10²⁵ atoms of Zn is 5.29 Kg

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The correct option is B as The reaction proceeds to the right, increasing the formation of products.

Le Chatelier’s principle states that if a system in a state of dynamic equilibrium is disturbed by a change to its conditions, then the position of equilibrium will shift to counteract the change. The addition of a catalyst, actually, has no impact on the position of equilibrium.

This is because catalysts speed up the rates of both the forward and reverse reactions. This means that the two rates remain equal, as they both change by the same amount. Adding more reactants to a chemical reaction shifts the equilibrium in the direction of the products; therefore, the equilibrium shifts to the right.

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Answer:

5l NO

2

at STP

No. of molecules=

22.4

5

mol=

22.4

5

×N

A

molecules

A) 5ℊ of H

2

(g)

No. of moles=

2

5

mol=

2

5

×N

A

molecules

B) 5l of CH

4

(g)

No. of moles of CH

4

=

22.4

5

mol=

22.4

5

N

A

molecules

C) 5 mol of O

2

=5N

A

O

2

molecules

D) 5×10

23

molecules of CO

2

(g)

Molecules of 5l NO

2

(g) at STP=5l of CH

4

(g) molecules at STP

Therefore, option B is correct.

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In chemistry, drawing chemical structures is a fundamental skill that allows us to communicate and understand chemical concepts.

A chemical structure is a diagram of a molecule or compound that depicts the arrangement of atoms as well as the chemical bonds that hold them together. Depending on the complexity of the molecule and the level of detail required, there are various methods for drawing chemical structures. Lewis structures, line structures, and condensed structures are the most prevalent types of chemical structures.Lewis structures are diagrams that depict a molecule's valence electrons and bonding patterns. To create a Lewis structure, you must first determine how many valence electrons each atom has and then use them to form bonds and fill octets.

When designing Lewis structures, you should additionally consider formal charges, resonance, and electronegativity.Line structures are a method of depicting molecules that is simplified by the use of lines to represent bonds and atoms. In line structures, each vertex or endpoint represents a carbon atom unless otherwise indicated. Hydrogen atoms are not usually shown unless they are attached to a heteroatom. Line structures are useful for quickly drawing and comparing structures, but they do not show the three-dimensional arrangement of atoms.Condensed structures are another way of representing molecules by using symbols and abbreviations to represent atoms and functional groups. In condensed structures, bonds are implied rather than drawn, and atoms are listed in the order of their connectivity.

Condensed structures are useful for representing large and complex molecules, but they can be ambiguous and difficult to read without practice.

Overall, drawing chemical structures is an essential skill in chemistry that requires practice and attention to detail. By learning how to draw Lewis structures, line structures, and condensed structures, you can better understand chemical concepts and communicate your ideas to others.

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Answer:

The answer would be D as no chemical change is occuring.

Explanation:

Answer:

D. Dissolving salt in water.

Explanation:

No chemical change is actually occurring when salt is added to water

Answer:

The charge that is typical for ions of the alkaline earth metals is +2

Explanation:

Group 1 elements (alkali metals such as Li, Na, K...) all have one valence electron that they donate when forming ionic bonds. This will cause them to have a charge of +1.T he alkaline earth metals (Ca, Mg) have two valence electrons they donate which means their charge when forming ions is +2. The members of the aluminum family lose three electrons giving them a charge of +3.