Which of the following statements is true?
a. An ion is negative if it has more protons than it
has electrons.
b. An ion is negative if it has more electrons than
it has protons.
c. An ion is neutral if it has an equal number of
electrons and protons.
d. An ion is positive if it has more electrons than it
has protons.
e. An ion is positive if it has more protons than it
has neutrons.

Answer:

It is composed of protons, which have a positive charge, and neutrons, which have no charge. Protons, neutrons, and the electrons surrounding them are long-lived particles present in all ordinary, naturally occurring atoms. Other subatomic particles may be found in association with these three types of particles.

Explanation:

Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

Answer:

Energía geotérmica (calor → energía eléctrica) Motores térmico, como el motor de combustión interna utilizado en automóviles o el motor de vapor (calor → energía mecánica) Energía térmica oceánica (calor → energía eléctrica) Represas hidroeléctricas (energía potencial gravitacional → energía eléctrica)

Explanation:

Answer:

One type of energy can change into another type of energy. Energy transformation means the changing of energy from one type to another, e.g. from kinetic energy to electrical energy, or from potential energy to kinetic energy.

Explanation:

According to the molar concentration, if you  have 550 ml of 7 M solution HCI and you want to make 3 L of diluted solution,the new concentration will be 1.28 M.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.In case of two solutions it is calculated as, M₁V₁=M₂V₂ on substitution gives M₂=7×550/3000=1.28 M.

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Answer: Phosporus- 1s2 2s2 2p6 3s2 2p3

Ruthenium- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d6

Barium- (Xe)6s2

Thorium- (Rn) 6d2 7s2

Answer:

28

Explanation:

In a bonding molecular orbital, the electron density is located between the nuclei, which pulls the nuclei closer together and stabilizes the bond.

In a bonding molecular orbital, the electron density is located between the nuclei which pulls the nuclei towards each other. This is because the electrons are shared by the two atoms, creating a bond that allows them to be attracted to each other. The more electron density there is between the nuclei, the stronger the bond will be. This is why atoms with similar electronegativities tend to form stronger bonds, as they share electrons more equally and have more balanced electron density between them.

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Answer:

CH4+4Cl2=CCl4+4HCI

Explanation:

It's been a while since i've done one of these, but I believe this is right. Hope this helps!

Answer:

118

Explanation:

There are two molecular orbitals are needed to form one bonding molecular orbital and one anti-bonding molecular orbital.

Bond orbitals Electrons that spend most of their time between the nuclei of two atoms are placed in bonding orbitals, and electrons that spend most of their time outside the nuclei of two atoms are placed in anti-bonding orbitals.

Adding up the same number of atomic orbitals gives the same number of molecular orbitals. Two atomic orbitals combine to form two molecular orbitals. An anti-bonding orbital is essentially the opposite of a bonding orbital. They form when atomic orbitals combine in ways that lead to almost destructive interference.

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The mass of unknown radioactive substance will be 69 gram.

When a substance will have unstable nuclei and even the capacity to spontaneously release energy while exchanging fast-moving charged particles in an effort to stabilize, the substance is described as radioactive.

It is known that

\(N/N_{0} = (1/2)^{t/x}\)

where, N = initial quantity, \(N_{0}\)  = quantity remaining, t = elapsed time.

Given that,

N = 38.5 g

t = 3.20 hours

x = 8 hour

\(N_{0}\) = ?

Put the value of given data in above equation.

\(N/N_{0} = (1/2)^{t/x}\)

38.5/ \(N_{0}\)  = 80/32

\(N_{0}\)  = 69 gram.

Therefore, the mass of unknown radioactive substance will be 69 gram.

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The balanced chemical equation for the acid-base reaction is:

2HCl + Ca(OH)2 → CaCl2 + 2H2O

A balanced chemical equation is a representation of a chemical reaction that shows the relative number of reactant and product molecules involved. It follows the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. In a balanced equation, the number of atoms of each element on both sides of the equation is equal.

A balanced chemical equation includes chemical formulas of reactants on the left side of the arrow and the chemical formulas of products on the right side. Coefficients are used to balance the equation by adjusting the number of molecules or moles of each substance involved. These coefficients indicate the relative stoichiometric ratios between reactants and products.

According to the equation, for every 1 molecule of CaCl2 that forms, 2 water molecules are produced. Therefore, the correct answer is:

twice as many, 2x

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Answer:

B. hot to cold

Explanation:

Energy wants to reach thermal equilibrium (which is basically just balanced temperature) so it will move from hot to cold to make the cold object warmer and the hot object cooler.

Energy-requiring reactions can occur in biological systems because they can be coupled with reactions that are exergonic reaction.

In chemical thermodynamics, an exergonic reaction is a chemical reaction where the conversion in the free energy is negative (there is a net allow to leave of free energy). This shows a unbidden reaction if the structure is closed and starting and final temperatures are the similar.

Formula of exergonic reaction :

∆G = Gproducts - Greactants

where

∆G = change in free energy

G-products = free energy of products

G-reactants = free energy of reactants

Now, it can understood that "Energy - requiring reactions can occur in biological systems because they can be coupled with reactions that are exergonic reactions."

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Explanation:

a 1 ( only "s"

b 2 ( "s" ,"p" )

c 3 ( "s" , "p" , "d")

d 4 ( "s", "p" , "d", "f")

e 5 ( "s", "p", "d", "f", "g")

f 6 ( "s", "p", "d", "f", "g", "h" )

The number of atoms of any element in the given chemical formula is the number that is written on the food of the symbol of that element. Therefore, sublevels are present in the principal energy levels.

Atom is the smallest particle of any matter. Atom combines to form element and element combine to form molecule or compound.

Atom consists of electron, proton and neutron. The total mass of atom is inside the nucleus. Inside the nucleus proton and neutron is there. So calculate mass of an atom, total mass of all protons is added to the total mass of neutron. Electrons revolve around the nucleus.

principal energy levels               sublevels

1                                                         s

2                                                        s,p

3                                                        s,p,d

4                                                        s,p,d,f

5                                                        s,p,d,f,g

6                                                        s,p,d,f,g,h

Therefore, sublevels are present in the principal energy levels.

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Answer:

Lipids

Explanation:

Lipids, another key biomolecule of living organisms, fulfill a variety of roles, including serving as a source of stored energy and acting as chemical messengers.

The Kush civilization was influenced by Egyptian civilization because the Kush conquered and ruled over much of Egypt

What kush was influenced by ?

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Answer:

false

Explanation:

Answer:

The answer will be C

Explanation:

Solution A has a pH of 3, and solution B has a pH of 5 "Solution B is less acidic than solution A".

The chemical circumstances of such a solution are reflected by pH, which is an essential quantity. The pH might influence nutritional availability, biological functioning, microbial activity, as well as chemical behavior.

Acidic substances were characterized by a sour flavor. An acid is a molecule that can give an H+ ion while remaining energetically stable.

It is known that if pH ≥7 then solution will be acidic

Hence, solution B is less acidic than solution A.

Therefore, the correct answer will be option (C).

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Answer:

here hope it helps

Explanation:

covalent bonds

Answer:

The three most common base units in the metric system are the meter, gram, and liter. The meter is a unit of length equal to 3.28 feet; the gram is a unit of mass equal to approximately 0.0022 pounds (about the mass of a paper clip); and the liter is a unit of volume equal to 1.05 quarts.

a meter is bigger

i dk the 2 one sorry

Answer:

Fraction of water that can be vaporized = 0.0961 or 9.61%

Note : The question is incomplete. The complete question is given below:

A serving of Cheez-Its releases 130 kcal (1 kcal = 4.18 kJ) when digested by your body.

If this same quantity of energy were transferred to 2.5 kg of water at its boiling point, what  fraction of the water would be vaporized?

Explanation:

Energy released by a serving of Cheeze-Its = 130 kcal

Since 1 kcal = 4.18 kJ, 130 kcal = 130 * 4.18 kJ = 543.4 kJ

Heat of vaporization (evaporating or condensing) Hv, of water = 2260 J/g

From formula, quantity of heat, Q = mass  * heat of vaporization

mass of water = 2.5 kg = 2500 g

Q = 2500 g * 2260 J/g

Q  = 5650000 J = 5650 kJ

Therefore 2.5 kg of water requires 5650 kJ of heat for complete vaporization

Fraction of water that can be vaporized by 543.4 kJ energy = 543.4/5650

Fraction of water that can be vaporized = 0.0961 or 9.61%

Answer:

iron sulfate

Explanation:

Electrostatic attraction as bonds between ions is characteristic of the electrovalent bond or the ionic bond

In this type of bond, there is electron transfer from one atom to another. The atom that looses electrons become positively charged while the atom that gains electrons becomes negatively charged.

In iron sulfate, there is electrostatic attraction between Fe II ions and sulphate ions, making iron sulfate an ionic compound.

Answer:

Cohesion exists because of the polarity of water. The water has a dipole that causes it to act like a magnet, attracting other water molecules to it. ... The salt water has a much lower cohesion than plain water so it's attractive forces are less than plain water.

False. Potassium-argon dating is a radiometric dating technique used to determine the age of rocks and minerals.

It is based on the decay of the isotope potassium-40 (K-40) into argon-40 (Ar-40) over time. This dating method is particularly useful for dating volcanic rocks and minerals because the K-40 is commonly found in them.

Potassium-argon dating is not limited to organic materials. In fact, it is primarily used for dating inorganic substances like rocks and minerals. The method relies on the measurement of the ratio of K-40 to Ar-40 in a sample. By comparing this ratio to the known decay rate of K-40, scientists can calculate the age of the rock or mineral.

While other dating methods like radiocarbon dating are specifically designed for organic materials, potassium-argon dating is uniquely suited for dating non-organic substances, making it an important tool in geological and archaeological research.

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The correct answer is option (b) about 80°C, because the aluminum lost 15°C worth of heat to the water.

When the aluminum and water are in contact, heat will flow from the higher temperature object (aluminum at 95°C) to the lower temperature object (water at 15°C) until they reach thermal equilibrium.

Based on the principle of conservation of energy, the heat lost by the aluminum will be gained by the water. The amount of heat transferred can be calculated using the equation:

Q = m * c * ΔT

where:

Q is the heat transferred,

m is the mass of the substance,

c is the specific heat capacity of the substance,

ΔT is the change in temperature.

Assuming the specific heat capacity of aluminum is approximately equal to 900 J/(kg·°C) and that of water is approximately equal to 4186 J/(kg·°C), we can calculate the amount of heat lost by the aluminum and gained by the water.

For the aluminum:

Q_aluminum = (0.5 kg) * (900 J/(kg·°C)) * (95°C - final temperature)

For the water:

Q_water = (0.5 kg) * (4186 J/(kg·°C)) * (final temperature - 15°C)

Since the heat lost by the aluminum is equal to the heat gained by the water, we can set the two equations equal to each other:

(0.5 kg) * (900 J/(kg·°C)) * (95°C - final temperature) = (0.5 kg) * (4186 J/(kg·°C)) * (final temperature - 15°C)

Simplifying the equation and solving for the final temperature gives approximately 80°C.

Therefore, the final temperature of the aluminum and water mixture is about 80°C. Correct option is B.

The given question is incomplete and the completed question is given below.

You put a 0.5 kg piece of aluminum at 95 %C into 0.5 kg of water at 15 %C The final temperature of the aluminum and water is Select one: a. 55 *C, because the energy that left the aluminum when it cooled off heated up the water: b. about 80 %C, because the aluminum lost 15 %C worth of heat to the water; c a little more than 15 C, because the aluminum doesn t lose enough heat to warm up the water very much, a little less than 95 'C because all of the aluminum'$ heat is transferred to the water.

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The participants in the Panagbenga parade traveled a distance of 2 centimeters and had a displacement of approximately 1.41 centimeters from their initial position at Panagbenga Park to their final position.

The Panagbenga parade started at Panagbenga Park, which is located in South Drive, and began at 8:00 AM. The parade participants walked almost 1 kilometer from Panagbenga Park, and then turned 1 kilometer going to Melvin Jones Grandstand.

To compute the distance and displacement of the participants, we can use a scale of 1 kilometer to 1 centimeter.

Using this scale, we can represent the distance traveled by the participants as 2 centimeters, which is equivalent to 2 kilometers in real life. This is because the participants walked almost 1 kilometer from the park and then turned 1 kilometer going to the grandstand.

On the other hand, displacement refers to the change in position of an object from its initial position to its final position. In this case, the initial position of the participants is at Panagbenga Park, and their final position is at Melvin Jones Grandstand. The straight-line distance between these two points can be represented by a diagonal line.

Using the Pythagorean theorem, we can calculate the displacement of the participants as approximately 1.41 centimeters. This means that the displacement of the participants is shorter than the distance they traveled since the displacement is the shortest distance between their initial and final positions.

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Answer: B. Na

Explanation:

The element with 11 protons is sodium (Na), which has an atomic number of 11, indicating the number of protons in the nucleus of an atom of sodium. The atomic number uniquely identifies each element, so any element with 11 protons in its nucleus is sodium.

In addition, the atom in question has 11 electrons, which are equal in number to the protons, as atoms are electrically neutral. Furthermore, the atom has 12 neutrons, which is the total number of nucleons (protons and neutrons) in the nucleus. The atomic mass of sodium is approximately 23, which means that the most common isotope of sodium has 12 neutrons. Therefore, the atom in question has one more neutron than the most common isotope of sodium.

In summary, the atom described has 11 protons, 11 electrons, and 12 neutrons, which are the characteristics of a sodium atom with an atomic mass of approximately 23.

Generally, aldehydes are more reactive towards nucleophiles since they have less steric hindrance and fewer electron donating groups than ketones.

This is due to the fact that aldehydes have a smaller R-group attached to the carbonyl carbon compared to ketones, which have larger R-groups. This smaller R-group results in less steric hindrance around the carbonyl carbon, making it more accessible to nucleophiles. In addition, aldehydes have a hydrogen atom attached to the carbonyl carbon which can donate electrons to the carbon-oxygen double bond, making it more polarized and thus more susceptible to nucleophilic attack. Ketones, on the other hand, have two R-groups attached to the carbonyl carbon, which leads to more steric hindrance and less reactivity towards nucleophiles. Furthermore, the two R-groups in ketones can also have electron-donating groups attached to them, which can decrease the polarity of the carbon-oxygen double bond and reduce its reactivity towards nucleophiles. In summary, aldehydes are generally more reactive towards nucleophiles than ketones due to their smaller R-group and lack of electron-donating groups.

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