For the following multiple choice questions choose the best answer (2 points each):
1. The three fundamental particles of the atom are
a. Nucleus, protons and neutrons
b. Positrons, quarks and neutrinos
c. Protons, neutrons and electrons
d. Positrons, quarks and anti-neutrinos

Answer:

An element's location in the periodic table is largely dependent on its electrons; the number of valence shell electrons determines its group, and the type of orbital in which the valence electrons lie in determines the element's block.

Answer:

When the concentration is higher, more hydrogen ions are near the Zn atoms at any given time. This allows for more Zn atoms to be ionized and dissolved into the solution per second.

Explanation:

Answer:

I think above answer is fully correct. Mark it brainliest

Answer:

D

Explanation:

A: not true. You could have cement floors and still receive radio/TV

B: not true. Very little of the waves are absorbed by the walls.

C: not true. You can receive radio/TV if there isn't a carpet in the entire house.

D: Dis the answer. Walls don't absorb the incoming waves or not much of them

Explanation:

Chemical fertilizers raise crop yields, but their heavy usage has hardened the soil, diminished fertility, reinforced pesticides, contaminated air and water, and emitted greenhouse gases, posing health and environmental risks.

Answer:

malleable

Explanation:

The image represent in malleable property of metal.

The image possibly represents the photoelectric effect of a metal, which is when it emits electrons after being exposed to electromagnetic radiation. Metals are also characterized by physical properties such as conductivity, malleability, metallic luster, and metallic bonding.

Based on your question, the image possibly represents the photoelectric effect, a key property of metals. This phenomenon occurs when a metal surface exposed to electromagnetic waves of a certain frequency absorbs radiation and emits electrons. These emitted electrons are called photoelectrons. Metals can also exhibit free electron model behavior, where electrons freely roam within the metal structure.

Metals possess unique physical properties like conductivity, malleability, and metallic luster. Malleability refers to the metal's ability to deform without breaking, while conductivity refers to the metal's ability to transfer heat or electricity. A metallic luster gives metals their characteristic shiny appearance.

Finally, metals are also known for their metallic bonding—a unique force that holds together the atoms within a metallic solid. Metallic bonding gives rise to many useful and varied bulk properties of metals.

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Answer:

D

Explanation:

Two times smaller than the force in Trial 2

Answer:

colourless

Explanation:

although the gaseous form of oxygen is colourless

when it liquefies it turns into a blue fluid.

hope this helps:)

The pH values for each case in the titration of 25.0 mL of 0.180 M pyridine (C5H5N(aq)) with 0.180 M of the strong acid HBr(aq) can be calculated using the equilibrium expression and the Henderson-Hasselbalch equation.

Pyridine (C5H5N) is a weak base that reacts with the strong acid HBr in a titration. The equilibrium involved in this reaction is the reaction of pyridine with H+ to form the pyridinium ion (C5H5NH+) and the conjugate base of the acid (Br-).

The equilibrium expression for this reaction is: C5H5N + H+ ⇌ C5H5NH+

To calculate the pH at different points of the titration, we can use the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the conjugate base (C5H5NH+) and [HA] is the concentration of the weak acid (C5H5N).

Initially, before any HBr is added, the solution consists only of pyridine. Therefore, the pH can be calculated using the initial concentration of pyridine.

As the titration proceeds, the moles of HBr added react with the moles of pyridine present. By calculating the moles of HBr added and using the stoichiometry of the reaction, we can determine the concentrations of C5H5NH+ and C5H5N at each point.

Using these concentrations in the Henderson-Hasselbalch equation, we can calculate the pH for each case in the titration.

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The statement "a neutral carbon atom has six protons in its nucleus, which means two electrons in the first energy level and the remaining four in the second energy level" is true.

This is because the number of protons in an atom's nucleus determines the atomic number, which in turn determines the number of electrons in a neutral atom.

Carbon has an atomic number of 6, which means it has 6 protons and 6 electrons.

The electrons in a carbon atom occupy the first and second energy levels, with 2 electrons in the first energy level and the remaining 4 electrons in the second energy level.

Therefore, the statement "a neutral carbon atom has six protons in its nucleus, which means two electrons in the first energy level and the remaining four in the second energy level" is true.

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The ion that has 26 protons, 28 neutrons, and 24 electrons is Iron (Fe) (option c).

An element can be determined by the number of protons in the nucleus of its atom. The number of protons present in an atom is referred to as the atomic number of the element.

This means that the number of protons in an atom is unique to a specific element.

Iron (Fe) has 26 protons in the nucleus of its atom.

Therefore, an ion with 26 protons is an ion of the element iron (Fe).

Magnesium (Mg) has 12 protons, Chromium (Cr) has 24 protons, Xenon (Xe) has 54 protons and Nickel (Ni) has 28 protons.

Thus, an ion which has 26 protons, 28 neutrons, and 24 electrons  is Fe (option c)

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Answer:

Condensation is the process of water vapor condensing into liquid water.

Explanation:

"Water condenses on a can of cold soda. Water vapor in the air reaches its dew point as it cools in the air around the can, forming liquid drops of water. Condensation is the process where water vapor becomes liquid. It is the reverse of evaporation, where liquid water becomes a vapor." -National Geographic"

The Na+/K+ pump helps a muscle cell maintain a state of "resting membrane potential." The resting membrane potential is the difference in voltage across the cell membrane when the muscle cell is not actively contracting.

The Na+/K+ pump plays a crucial role in this process by actively transporting three sodium ions (Na+) out of the cell and two potassium ions (K+) into the cell.

This exchange creates an electrochemical gradient, resulting in a net negative charge inside the cell and a net positive charge outside the cell.

This gradient is essential for the proper functioning of muscle cells, as it allows them to respond to stimuli and initiate muscle contractions.

In summary, the Na+/K+ pump is essential for maintaining the resting membrane potential in muscle cells, ensuring their proper function and responsiveness.

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Answer:

0.5 moles of CO2 will react with 0.708 moles of H2O.

Explanation:

\(\sf balanced \ equation = 3CO2 + 4H2O \rightarrow C3H8 + 5O2\)

using molar ratio:

4H2O : 3CO2

4 : 3

so H2O moles:

\(\sf\dfrac{0.708}{4} *3\)

\(\sf 0.531\) moles of CO2

There are various type of chemical reactions in chemistry like combination reaction , displacement reaction. One of these is the decomposition reaction. The correct option is option D.

Decomposition reaction is the one in which molecules breaks down in its constituent in presence of energy. Energy can be in any form, it can be light energy , heat energy.

Decomposition of water is done by providing electricity and the reaction is called electrolysis. Lysis means to break. To give decomposition reaction molecule must have more than one element.

The fourth reaction describe a decomposition reaction (NaNO3 decomposed to become NaNO2 and O2). First and third reaction are considered combustion reaction (reacting with oxygen). Second reaction is acid-base reaction.

Therefore, the correct option is option D.

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Answer: A The Triangle Fire was a tragedy that could have been prevented.

Explanation:

The Triangle Fire was a tragedy that happened in the factory of Shirtwaist Company in New York City where there was.a.fore outbreak and about 145 employees of the company were killed.

The deaths could have been prevented because the company neglected safety measures such as having a good and reliable pump system, having readily available fire extinguishers. Also, what resulted in the lethal nature of the incident was because the doors within the building of the factory were locked.

The tragedy generated lots of attention and series of laws were been out in place in order to ensure that workers are safe at their workplace.

Answer:

Solid, Liquid, and Gas!

Explanation:

Plants produce glucose and oxygen in an endothermic reaction called photosynthesis. The mass of glucose, C6H12O6, made when 1.0g of water reacts with carbon dioxide is 60gm.

Photosynthesis is a process used by plants and other organisms to change light energy into chemical energy that, through cellular respiration, can later be passed to fuel the organism's activities.

6H₂O + 6CO₂ CH12O6 + 602

We must convert the water to moles. We know that the molar mass of

Water 18

= 1 / 18

= 0.055

Now we look at our chemical equation's mole ratios. We can see that

6 moles of water produce 1 mole of glucose.

therefore, we will have 1/3 mol of glucose

The molar mass of glucose is 180

= 60gm of glucose will produce.

Thus, the mass of glucose, C6H12O6, made when 1.0g of water reacts with carbon dioxide is 60gm.

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The predominant form of CH3CH2NH3 at pH = 14 will be the ionized form.

This is because at high pH, the solution is basic, and there are excess hydroxide ions. The hydroxide ions remove a proton from the ammonium ion, forming ammonia and water. The chemical equation for this reaction is as follows:CH3CH2NH3+ OH- → CH3CH2NH2 + H2O

The predominant form of CH3CH2NH3 at pH = 14 is CH3CH2NH2. This is the ionized form of the compound, which has lost a proton to become an amine. The structure of the predominant form of CH3CH2NH3 at pH = 14 is shown below:CH3CH2NH2

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After shaking the mixture in a separatory funnel and allowing the mixture to settle, the outcome: There was no vacuum seal between the Buchner funnel and the flask.

A funnel is a tube or pipe this is huge at the pinnacle and slender at the bottom, used for directing liquid or powder right into a small establishment. Funnels are generally made of stainless steel, aluminum, glass, or plastic.

The funnel, which is also from time to time known as an advertising funnel or revenue funnel, illustrates the concept that each sale begins with a big wide variety of capacity clients and ends with a far smaller range of those who without a doubt make a purchase. The term "sales funnel software" usually refers to systems and assets that facilitate that technique by supporting corporations to automate or create belongings together with touchdown pages, follow-up emails, and charge gateways. In brief, they offer equipment and capabilities to help flip interested prospects into paying customers.

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The pH value of this buffer is 4.04.

A mixture of a weak acid and its conjugated base (here: benzoic acid and sodium benzoate) or a weak base and its conjugated acid is called a buffer. When calculating the pH value of a buffer, we use the Henderson-Hasselbalch equation:

\(pH = pKa+log\frac{[base]}{[acid]}\)

pKa - negative logarithm of acid's acidity constant (for benzoic acid, pKa = 4.19)

[base] - molarity of the basic component (sodium benzoate, NaOBz)

[acid] - molarity of the acidic component (benzoic acid, BzOH)

To calculate pH, we need the molarities of both sodium benzoate and benzoic acid. However, because the volume values for both components are the same, we can actually just use their number of moles (n). We can calculate the number of moles of each component using their mass (m) and molar mass (M):

n = m/M

n(NaOBz) = m(NaOBz) / M(NaOBz)

n(NaOBz) = 2.05 g / 144.11 g/mol

n(NaOBz) = 0.0142 mol

n(BzOH) = m(BzOH) / M(BzOH)

n(BzOH) = 2.47 g / 122.12 g/mol

n(NaOBz) = 0.0202 mol

Now we can plug these values into the equation:

pH = 4.19 + log(0.0142/0.0202)

pH = 4.19 + log(0.703)

pH = 4.19 - 0.15

pH = 4.04

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Answer:

B is the answer

Explanation:

Answer:

I think its option C

Explanation:

Answer:

C. Hydrocarbons

Explanation:

I think it is C

Answer:

Revolution of Guadlupe

Explanation:

No, nickel-cadmium (Ni-Cd) and lead-acid batteries should not be serviced and charged in the same area without proper precautions. This is because each type of battery has specific requirements and poses different risks during charging and maintenance.

One of the main concerns is cross-contamination. Lead-acid batteries contain sulfuric acid electrolyte, which can release hydrogen gas during charging. On the other hand, Ni-Cd batteries contain potassium hydroxide electrolyte. If the two electrolytes come into contact, they can react and cause chemical hazards or even explosion.

Additionally, the charging characteristics of Ni-Cd and lead-acid batteries are different. Ni-Cd batteries require a specific charging profile, including a controlled charging current and voltage, to prevent overcharging and potential damage to the battery. Lead-acid batteries, on the other hand, require a different charging profile.

To ensure safety and prevent any potential hazards, it is recommended to have separate charging areas and equipment for different battery types. This helps to avoid cross-contamination, maintain proper charging parameters, and minimize the risk of accidents or damage to the batteries.

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