Consider this equilibrium for a buffer solution: CH3COOH + H2O CH3COO- + H3O + . When a small amount of acid is added to this system, which statement is true when equilibrium is reestablished? A. [CH3COO-] and pH have both increased. B. [CH3COOH] and pH have both decreased. C. [CH3COO-] has decreased and pH remains relatively constant. D. [CH3COOH] has decreased and pH remains relatively constant. E. [CH3COO-] has increased and pH remains relatively constant.

2016 the warmest year on record, but eight of the twelve months that make up the year from January through September, with the exception of June were the warmest on record for those respective months. This is evidence showing how the climate has changed

Answer:

Climate change is caused when fuel is burned. This leads to excess carbon dioxide into the air. Scientists know that climate change is happening when:

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Answer:

The molecules have shorter inter molecular distances  and less kinetic energy than the original gas sample.

The cooling reduces the kinetic energy of the gas sample and thus the molecules making up the liquid sample travel less distances due to the less energy. The less inter molecular distances increases the attraction due to inter molecular forces packing the molecules near each other, forming a liquid.

Answer:

In order to answer the question, we convert the measurements given to a common base unit. For this case, we use seconds.

A)   0.02 seconds

B)   0.02 teraseconds x (10^12 s / 1 terasecond) = 2x10^10 seconds

C)   2,500 milliseconds x (1 s / 1000 ms) = 2.5 seconds

D)   25,000 nanoseconds x (1 x 10^-9 s / 1 nanosecond) = 2.5 x 10^-5 seconds

So ,The correct answer is option " D "

Pluto was ruled not a planet anymore because it is a "dwarf  planet"

Apparently, the International Astronomical Union's (IAU) definition of a planet includes that a planet should be part of a body that would orbit the sun.  

According to the IAU, there are three criteria's that contribute to a planet being called a planet.

1. It is within orbit around the Sun.

2. It has a sufficient mass to assume a nearly round shape

and 3. It has "cleared the neighborhood" around it's orbit.

Pluto only so happens to meet 2 of these requirements, not including the third option.

Answer:

In august 2006 the international astronomical union (IAU) downgraded the status of Pluto to that of "Dwarf planet." this means that from now on only the rocky worlds of the inner solar system and the gas giants of the outer system will be designated.

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Answer:

the answer would be C:  point source

Explanation:

because it specified the source of the pollution (manufacturing plant)

Answer:B.)

Explanation:

what the other person said

Answer:

The correct answer option is a) collisions between the particles and surrounding molecules.

Explanation:

The collisions between the particles and surrounding molecules causes the Brownian motion of particles in a colloid.

Brownian motion is the irregular movement of the microscopic particles in a fluid which bombard into each other.

It basically is the result of the molecules of a dispersion medium colliding with the dispersed particles of the phase.

Answer:

32 mols of water

Explanation:

2H2 + O2 ==> 2H2O

What your givens are telling you and what the equation is saying is that

for every mol of O2, you get 2 mols of H2O

So you could do it with the proportion about.

1/16 = 2/x                 Cross multiply

x = 16 * 2

x = 32

Answer:

32 mol

Explanation:

The balanced reaction from Oxygen and Hydrogen to form Water is:

(1/2)O₂ + H₂ ⇒ H₂O

So, 1/2 mol of oxygen forms 1 mol of water. The stoichiometry calculus must be:

1/2 mol of O₂ -------------------------- 1 mol of H₂O

16 mol of O₂ --------------------------- x mol of H₂O

By a direct simple three rule:

(1/2)x = 16

x = 32 mol

Energy is released when this happens

I believe it is Energy, I am not sure. Sorry if it is wrong.

Answer:

The particles that have approximately the same size and mass is Proton and Neutron.

Explanation:

Answer:

from 2-pentanone  chloropentane  pentene  and pentane, the correct one is 2-pentanone .

N(number of moles)=mass/molar mass

10.5=mass

Na=23 (rounded)

Cl=36 (rounded)

Add it together to get the molar mass

=59

Then refer back to the formula

10.5/59

=0.17796

Round that answer

=0.18 mol

Answer : The correct option is, 0.180 mole

Explanation : Given,

Mass of NaCl = 10.5 g

Molar mass of NaCl = 58.5 g/mole

Formula used :

[tex]\text{Moles of NaCl}=\frac{\text{Mass of NaCl}}{\text{Molar mass of NaCl}}[/tex]

Now put all the given values in this formula, we get the moles of NaCl.

[tex]\text{Moles of NaCl}=\frac{10.5g}{58.5g/mole}[/tex]

[tex]\text{Moles of NaCl}=0.179mole=0.180mole[/tex]

Therefore, the number of moles of NaCl is, 0.180 mole

Answer:

[tex]\boxed{\text{A) filter}}[/tex]

Explanation:

An automobile air filter is often made of porous pleated paper. Many of them are cylindrical, as in the diagram below, but others have shapes that fit the available space in the engine compartment.

B) is wrong. A radiator is used to cool the car's engine.

C) and D) are wrong. You probably won't find a distillation apparatus or chromatography paper in your mother's car unless she is a chemist taking them somewhere else.

It would be letter A

The answer to this question would be b.

3 things affect the freezing point of water, a constant(Kf), molality(b) and a number of dissolved particles (i).

Kf is a constant so that has the same effect. Because you have 1 mole of everything, molality is also constant.

so the only thing you gotta look after is the number of the dissolved particles which which iron III chloride has the highest

Final answer:

The 1 molar FeCl3 solution will have the lowest freezing point because, upon dissociation, it produces the most particles per kilogram of water, which causes the greatest freezing point depression. So the correct option is b.

Explanation:

The solution with the lowest freezing point is determined by the number of particles produced in the solution upon dissolving the solute. The effect on the freezing point is a colligative property, meaning it depends on the number of solute particles in the solution, not the type of particles. To answer which of the following solutions will have the lowest freezing point — 1 molar KCl, 1 molar FeCl3, 1 molar CaCl2, or 1 molar NaCl — we must consider the dissociation of each compound.

KCl, NaCl, and CaCl2 are all salts that dissociate into ions in solution. KCl and NaCl dissociate into two ions (K+ and Cl- for KCl, Na+, and Cl- for NaCl), so a 1 molar solution of these salts will produce 2 moles of ions per kilogram of water. CaCl2 dissociates into three ions (Ca2+, Cl-, Cl-), resulting in 3 moles of ions per kilogram of water. FeCl3, however, dissociates into four ions (Fe3+, Cl-, Cl-, Cl-), which gives us 4 moles of ions per kilogram of water.

Thus, the solution of 1 molar FeCl3 will have the lowest freezing point because it produces the highest number of dissociated particles, leading to the greatest degree of freezing point depression.

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When red light is added to green light you get yellow

Answer:

it explains the relationship between temperature and volume

Charles law states that if given quantity of gas is held at a constant pressure, then its volume is directly proportional to the absolute temperature. this law explains relation between temperature and volume.

Charles' law is just a gas statement that governs how gases increase while heated in an experimental setting. The Kelvin temperature and volume should be in direct proportion whenever the pressure on such a test of dry gas was maintained constant, according to a modern version of Charles's law.

A scalar quantity that expresses the proportion of three-dimensional area contained by a sealed surface will be called volume.

Therefore, Charles law states that if given quantity of gas is held at a constant pressure, then its volume is directly proportional to the absolute temperature. this law explains relation between temperature and volume.

To know more about Charles law.

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Answer:

The correct answer is radiation thermal energy.

Explanation:

The transfer of energy in thermal energy comprises the transfer of internal energy. The three kinds of thermal energy transfer are convection, conduction, and radiation. In convection, the movement of warm particles takes place, in conduction the direct contact of atoms occurs, and in radiation, the transfer of energy takes place in the form of electromagnetic waves.

Answer:

D

Explanation:

All the others are unrelated to biology as biology is the study of life (hence bio) and not chemistry or anything else.

A biologist might study the causes of honeybee deaths in beehives, as it falls within the biological study of organisms, their ecosystems, and their interaction with the environment. Ecologists, as biologists, may study predator-prey dynamics and the role of biodiversity and ecological succession in species survival.

A biologist might choose to study the causes of honeybee deaths in beehives. This topic falls under the field of biology as it involves examining the biological factors, ecosystems, and environmental impacts on a species. Biology encompasses the study of living organisms, their interactions within ecosystems, and factors affecting their survival. For instance, a biologist studying honeybee mortality may investigate patterns in bee behavior, health, genetic factors, or the influence of pesticides and other anthropogenic factors on populations.

A specific example of a biologist's work could be an ecologist studying the patterns on the wings of an endangered butterfly species to understand how these patterns help the species escape predators like birds. Researchers in such fields collect data, observe, and analyze patterns to draw conclusions about biological processes and biodiversity. Additionally, factors such as ecological succession and biogeography are critical in such studies.

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Answer: compound, chemical

Explanation:

-173.15

-0.15

-267.15

416.15

846.15

assuming k is kelvins and c is celsius

1. -173.15°c

2. -0.15°c

3. -267.15°c

4. 416.15k

5. 846.15k

The law of inertia. Basically, every object stays in the same spot unless they are moved by an external force, .

An object at rest will remain at rest or an object in motion will remain in motion unless acted upon an unbalanced force

Ans: 187.5 grams of Al2O3

Final answer:

To calculate the mass of [tex]Al_2O_3[/tex] produced from 375 grams of Al, we find the moles of Al, use the stoichiometry of the reaction to find the moles of [tex]Al_2O_3[/tex], and then convert to grams. The result is 708.6 grams of [tex]Al_2O_3[/tex].

Explanation:

Given the balanced chemical reaction [tex]4Al + 3O_2 \rightarrow 2Al_2O_3[/tex], we first need to calculate the number of moles of aluminum (Al) that's present in 375 grams. Using the molar mass of aluminum (26.98 g/mol), we can determine this:

Hence, if 375 grams of Al react completely, a total of 708.6 grams of [tex]Al_2O_3[/tex] will be produced.

This is false! Einstein’s equation implies that a small amount of mass can be converted into a huge amount of energy. For example, my mass (~125 kg) if converted to energy would release approximately 11.2 exajoules (1.12 x 10^19 J), or enough energy to power the whole United States for about 45 days.

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Answer:

2.209687527979228

Explanation:

Hope this help!

A balanced chemical equation is analogous to a recipe because it outlines precise quantities of reactants needed to produce specific products, reflecting the concept of stoichiometry used in cooking. Adjusting ingredient amounts when changing recipe size is similar to calculating reactant and product amounts in chemical reactions, demonstrating the conservation of mass.

A balanced chemical equation is similar to a recipe in that both provide the exact proportions of ingredients or reactants needed to produce a desired outcome, be it a chemical product or a food dish. When you follow a recipe, you are essentially performing stoichiometry, which is the precise measurement and calculation of reactants and products in a chemical reaction. Just as doubling or halving a recipe requires adjusting the amount of each ingredient accordingly, the same concept applies to chemical reactions when predicting the amounts of products produced or reactants required.

For instance, just like a recipe that makes 1 dozen biscuits requires specific quantities of flour, eggs, shortening, salt, baking soda, and milk, a chemical equation needs to balance the atoms of each element on both the reactant and product sides of the equation. This reflects the conservation of mass, as the quantity of each element remains constant throughout the reaction. The balanced equation thus communicates not only the substances involved but also their amounts in a concise and quantitative manner. By understanding the concepts used in cooking, one can grasp the principles of stoichiometry and balanced equations in chemistry.

Answer:

Chernobyl Accident 1986. The Chernobyl accident in 1986 was the result of a flawed reactor design that was operated with inadequately trained personnel. The resulting steam explosion and fires released at least 5% of the radioactive reactor core into the atmosphere and downwind – some 5200 PBq (I-131 eq).

Explanation:

The Chernobyl disaster was a catastrophic nuclear accident in 1986, causing immediate deaths and long-term health issues due to radiation. The region remains largely uninhabitable due to persistent contamination.

Significance of the Chernobyl Meltdown:

The Chernobyl disaster, which occurred on April 26, 1986, was a catastrophic nuclear accident at the Chernobyl Nuclear Power Plant in Ukraine. During an unauthorized safety test, reactor no. 4 exploded due to an uncontrollable chain reaction, causing immense steam pressure that ruptured the reactor and released radioactive material.

The aftermath saw 50 tonnes of radioactive material released into the environment, leading to the evacuation of approximately 30,000 people.

Immediate effects included the deaths of 32 plant workers and firefighters who succumbed to acute radiation sickness. Long-term consequences predict around 4000 additional deaths from radiation-induced illnesses like cancer among emergency workers and former residents.

The region around Chernobyl remains highly contaminated and largely uninhabitable, demonstrating the devastating and lasting impact of nuclear accidents on both human populations and the environment.

The Chernobyl disaster has highlighted the risks associated with nuclear energy, influenced global nuclear policy and safety standards, and left a stark reminder of the potential outcomes of nuclear energy mismanagement.

I am pretty sure the answer is D. Lithospheric plate movement. :)

D, because without plate movement, there would be no earthquakes or other geologic events.

I believe C is the balanced equation.

C is the answer i think

Answer:

B. Nonpolar covalent bond

Explanation:

Between two Nitrogen atoms, a non-polar covalent bond would be formed.

So, what is the nature of a covalent bond, and what makes a covalent bond non-polar?

A covalent bond is a type of bond that forms between two atoms that shares their valence electrons. The valence electrons are donated by the two atoms and they are shared in order to achieve an octet. This bond type is predominantly between atoms that have an electronegativity difference less than 0.5. Using the electronegativity values, we see that a difference of 0 would be obtained.

Due to equal affinities of the two atoms for the valence electrons, none of them will pull the electrons closer to themselves. There won't be any form of charge separation on the two atoms and a Nitrogen molecule will form. This makes the bond type a non-polar covalent type.

Answer:

B. Nonpolar covalent bond

Explanation:

Between two Nitrogen atoms, a non-polar covalent bond would be formed.

So, what is the nature of a covalent bond, and what makes a covalent bond non-polar?

A covalent bond is a type of bond that forms between two atoms that shares their valence electrons. The valence electrons are donated by the two atoms and they are shared in order to achieve an octet. This bond type is predominantly between atoms that have an electronegativity difference less than 0.5. Using the electronegativity values, we see that a difference of 0 would be obtained.

Due to equal affinities of the two atoms for the valence electrons, none of them will pull the electrons closer to themselves. There won't be any form of charge separation on the two atoms and a Nitrogen molecule will form. This makes the bond type a non-polar covalent type.