Suggest a change of state, other than ice melting, that is an endothermic
process.​

Answer:

A neutralized solution in chemistry refers to the reaction between an acid and base that results in a neutral balance, or a measure of 7 on the pH scale.

Explanation:

Answer:

Correct Option is Option A

A.)It became prey to certain organisms in the river.

Explanation:

CHECK COMPLETE QUESTION BELOW;

An invasive fish species was accidentally introduced into a river. At first, it experienced a sudden surge in its population. Then it experienced a steady decline. Which statements give plausible reasons for this trend?

A.It became prey to certain organisms in the river.

B.It lacked adaptations suitable for that particular ecosystem.

C.It had no predators in its new environment.

D.It had few organisms to compete with for resources.

Aquatic invasive species are species such as fish or invertebrate that is absorbed by new aquatic environment that are differ from their own natural environment.

When Aquatic invasive species found themselves in a new environment, at first they will experience a rapid increase in the number of their population this is because of the lack of natural predators in the new aquatic environment. As a result of this they bring about the alteration of food web structure, they take in charge of available food for the native species and compete with them. As a result of this competition involved there is a decrease in the population.

Therefore, the statements that gives plausible reasons for this trend is that became prey to certain organisms in the river.

Answer:

It became prey to certain organisms in the river.

It lacked adaptations suitable for that particular ecosystem.

Explanation:

Took the test on Edmentum

The value x in the chemical symbol is Aluminium.Aluminum (or aluminium in British English) is a chemical element with the symbol Al and atomic number 13. It is a silvery-white, soft, nonmagnetic, and ductile metal that is widely used in various industries for its light weight, high strength, and good conductivity properties. Aluminum is the third most abundant element in the Earth's crust, after oxygen and silicon, and is found in many minerals including bauxite.

The chemical symbol for aluminum is "Al". The number of electrons and neutrons in an atom does not determine the chemical symbol for that element. The chemical symbol for an element is based on its atomic number, which is the number of protons in the nucleus of an atom of that element. The atomic number of aluminum is 13, so its chemical symbol is always "Al".

Some common uses of aluminum include the manufacture of transportation vehicles, packaging materials, construction materials, electrical conductors, and consumer goods. It is also used in the aerospace, defense, and high-tech industries due to its high strength-to-weight ratio and good thermal conductivity.

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Answer:

Dry Chemical Extinguishers

Explanation:

They are found in apartments,homes and any other place that you live.

Answer:

B and D

Explanation:

To determine the chloride ion (Cl-) concentration in milligrams per liter (mg/L) of ground water, we need to calculate the moles of chloride ions and then convert it to the desired concentration units.

Given:

Volume of ground water sample = 100 mL = 0.1 L

Mass of precipitate (AgCl) = 60.0 mg

The molar mass of AgCl is calculated as follows:

Ag: 1 atom x 107.87 g/mol = 107.87 g/mol

Cl: 1 atom x 35.45 g/mol = 35.45 g/mol

Total molar mass of AgCl: 107.87 g/mol + 35.45 g/mol = 143.32 g/mol

Now, let's calculate the moles of chloride ions (Cl-):

moles of AgCl = mass of AgCl / molar mass of AgCl

             = 60.0 mg / 143.32 g/mol

             = 0.4183 mmol

Since AgCl precipitates when all the chloride ions react with AgNO3, the moles of chloride ions are equivalent to the moles of AgCl formed.

To convert the moles of chloride ions to milligrams per liter (mg/L):

Chloride ion concentration = (moles of Cl- / volume of water sample) x 1000

                         = (0.4183 mmol / 0.1 L) x 1000

                         = 4183 mg/L

Therefore, the chloride ion concentration in milligrams per liter (mg/L) of the ground water sample is approximately 4183 mg/L.

By adding an excess of AgNO3 solution to precipitate all the chloride ions as AgCl and measuring the mass of the resulting precipitate, we can determine the chloride ion concentration in milligrams per liter (mg/L) of the ground water sample. In this case, the chloride ion concentration is found to be approximately 4183 mg/L.

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Answer:

what are the options to the question

Answer:

b and c

Explanation:

just took it on edge :)

The value of x should be 1/9.

The proportion of Californians who are elderly is 0.111.

The probability that a person has received a vaccine shot given that the person is elderly is 70%

The probability that a person has received a vaccine shot given that the person is not elderly is 2%

Probability that a person is elderly given that the person has received a vaccine shot is to be calculated.

Probability that a person is elderly and has received a vaccine shot,

P(E and V)=P(V | E) P(E)P(V | E) = 70%, P(E) = 0.111, soP(E and V) = (0.7) (0.111) = 0.0777

Probability that a person has received a vaccine shot, P(V) = P(E and V) + P(NE and V) P(NE) = (0.7) (0.111) + P(NE and V) P(NE) = 0.0777 + P(NE and V)P(NE and V) = P(V | NE) P(NE)P(V | NE) = 2%, soP(NE and V) = (0.02) (1 - 0.111) = 0.0178P(V) = 0.0777 + 0.0178 = 0.0955

Probability that a person is elderly given that the person has received a vaccine shot, P(E | V) = P(E and V) / P(V) = 0.0777 / 0.0955 = 0.8148(a) P(Bc|A) is the probability of driver’s blood alcohol percentage is not exceeding the legal limit, given that the breath analyzer indicates that legal limit is exceeded.

(b) We know that P(A|B) = P(Ac|Bc) = 0.95 and P(B) = 0.05P(A) = 1 - P(Ac) = 1 - 0.95 = 0.05P(Bc|A) = P(Ac|Bc) P(Bc) / P(A)P(Bc) = 1 - P(B) = 1 - 0.05 = 0.95P(Bc|A) = 0.95 × 0.95 / 0.05 = 18.05(c) P(B|A) = x and P(A) = 0.05P(Ac) = 0.95, P(B|Ac) = 0P(B|A) = P(B and A) / P(A)P(B and A) = P(B|A) P(A) = x (0.05)P(Bc|Ac) = 1 - x = P(Ac|Bc) = P(Bc|Ac) P(Ac) / P(Bc) = (1 - x) (0.95) / 0.95P(B) = P(B and A) + P(B and Ac) = x (0.05) + (1 - x) (0.95) = 0.95 - 0.9 x

Therefore,0.9 x = 0.95 - 0.05x = 1/9

Hence, the value of x should be 1/9.

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A single electron from the outermost shell of this element moves to the outermost shell of an atom with seven electrons.

When forming ions elements typically gain or lose the minimum number of electrons required to make a complete octet. For example, fluorine has 7 valence electrons, so it is most likely to gain an electron and form an ion of charge At the outermost energy level he states 8 electrons must be reached for an atom to be stable. Particles smaller than an atom.

Ionization is the process by which ions are formed by gaining or losing electrons from atoms or molecules. When an atom or molecule receives an electron it becomes a negatively charged anion and when it loses an electron it becomes a positively charged cation. Energy can be lost or gained in the formation of ions.

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Answer:

Hydrogen

Explanation:

Answer:

trial 1

Explanation:

trust

Answer:

O begins to boil

Explanation:

When the vapor pressure of a liquid is equal to the atmospheric pressure, the liquid suddenly begins to boil.

Answer:

has no observable changes

Explanation:

Answer:

of zinc sulfide:

0.382 moles ZnS * 97.45 g/mol = 37.4 g ZnS

To find the mass of the excess reactant (sulfur) that will remain after the reaction is complete, we need to subtract the mass of the product (zinc sulfide) from the mass of the excess reactant:

30.0 g sulfur - 37.4 g ZnS = -7.4 g excess sulfur

Since the mass of the excess reactant is negative, this means that the reaction will consume all of the sulfur and there will be none left over.

To summarize:

A. Zinc is the limiting reactant.

B. 37.4 g of ZnS will be formed.

C. There will be no excess sulfur left over after the reaction is complete.

Explanation:

Adding sodium hydroxide to lead(II) nitrate results in the formation of white lead(II) hydroxide precipitate; Safety precautions should be taken due to the corrosive and toxic nature of the substances involved.

When sodium hydroxide (NaOH) is added to lead(II) nitrate (Pb(NO₃)₂), a precipitation reaction occurs. The balanced chemical equation for the reaction is:

2 NaOH(aq) + Pb(NO₃)₂(aq) → Pb(OH)₂(s) + 2 NaNO₃(aq)

This reaction shows that two moles of sodium hydroxide react with one mole of lead(II) nitrate to form one mole of lead(II) hydroxide (Pb(OH)₂) and two moles of sodium nitrate (NaNO₃).

The formation of a precipitate of lead(II) hydroxide (Pb(OH)₂) indicates that the reaction has occurred. The white solid of lead(II) hydroxide should be visible in the test tube.

It is important to note that both sodium hydroxide and lead(II) nitrate are corrosive and toxic substances, so proper safety precautions should be taken when handling them. Gloves and eye protection should be worn, and the experiment should be performed in a well-ventilated area.

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Answer:

im 99% sure it's 175.

Explanation:

keep trucking, i know school is hard but you're doing amazing

Answer:

0.756 J

Explanation:

Temperature change (delta T) = 0.855 degrees Celsius

Mass of water (m) = 0.2067 g

Specific heat capacity of water (c) = 4.28 J/g degrees C

Heat added = m * c * delta T

= (0.2067 * 4.28 * 0.855) J

= 0.756 J

The voltage of the cell is 0.331 V when the Cu(NO3)2(aq) concentration is 1.5 M.

The voltage of the cell can be determined based on the graph provided in the question if the concentration of Cu(NO3)2(aq) is 1.5 M. The graph represents a concentration cell consisting of two Cu(NO3)2 solutions of different concentrations.The half-reactions for the cell are as follows:Cu2+(aq) + 2e- → Cu(s) (oxidation)Cu2+(aq) + 2e- → Cu(s) (reduction)The concentration cell's potential is given by the Nernst equation:E = E° - (RT/nF)ln(Q)where E is the cell's potential, E° is the standard cell potential, R is the gas constant, T is the temperature, n is the number of electrons transferred, F is the Faraday constant, and Q is the reaction quotient.The standard cell potential E° for the concentration cell can be calculated from the half-cell potentials:E° = E°(reduction) - E°(oxidation)The half-cell potentials for Cu2+/Cu are known, and their values are:E°(Cu2+/Cu) = +0.34 VThe concentration cell's potential can be calculated using the Nernst equation:E = E° - (RT/nF)ln(Q)We can determine the reaction quotient Q from the concentrations of the Cu2+ ions in the two half-cells:Q = [Cu2+]higher/[Cu2+]lowerwhere [Cu2+]higher is the concentration of Cu2+ in the higher-concentration half-cell and [Cu2+]lower is the concentration of Cu2+ in the lower-concentration half-cell.The concentration of Cu(NO3)2(aq) is 1.5 M, so the concentration of Cu2+ ions in the higher-concentration half-cell is also 1.5 M. We don't know the concentration of Cu2+ ions in the lower-concentration half-cell, but we can determine it from the graph provided.In the graph, we can see that the potential difference between the two half-cells is 0.1 V when the concentrations of Cu2+ ions in the two half-cells are equal (i.e., when [Cu2+]higher = [Cu2+]lower). Since the concentration of Cu2+ ions in the higher-concentration half-cell is 1.5 M, the concentration of Cu2+ ions in the lower-concentration half-cell is 0.15 M (as shown on the graph).Now we can calculate the concentration cell's potential:E = E° - (RT/nF)ln(Q)E° = E°(Cu2+/Cu) = +0.34 Vn = 2 (because 2 electrons are transferred)T = 298 KE = +0.34 V - (0.0257 V/K)(ln(1.5/0.15)/2)E = +0.34 V - (0.0257 V/K)(ln(10)/2)E = +0.34 V - (0.0257 V/K)(0.693/2)E = +0.34 V - (0.0257 V/K)(0.3465)E = +0.34 V - 0.0089 VE = +0.331 V.

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The carbon dioxide cycle refers to the natural process of exchanging carbon dioxide between the atmosphere, oceans, and land. This cycle can help to regulate the levels of carbon dioxide in the atmosphere over long periods of time.

However, it is not able to easily correct for the increasing amounts of carbon dioxide that have been introduced into the atmosphere by industrialization for several reasons: Carbon dioxide emissions from human activities are much larger than natural carbon dioxide sources: Human activities, such as burning fossil fuels, deforestation, and industrial processes, have greatly increased the amount of carbon dioxide in the atmosphere.

The natural carbon sinks are not capable of absorbing all the excess carbon dioxide: The carbon dioxide cycle relies on natural carbon sinks such as forests and oceans to absorb carbon dioxide from the atmosphere. However, these natural carbon sinks have limits to their capacity and are becoming saturated with excess carbon dioxide.

The rate of carbon dioxide emissions is much faster than the rate at which natural carbon sinks can absorb carbon dioxide: The natural carbon sinks have a limited capacity to absorb carbon dioxide, and their absorption rate is much slower than the rate at which carbon dioxide is being emitted by human activities.

This means that the excess carbon dioxide remains in the atmosphere for longer periods of time, contributing to the buildup of carbon dioxide in the atmosphere.

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Answer:

B

Explanation:

A hypothesis is a proposed explanation for a phenomenon. It is what you think will happen in the experiment.

A is wrong, it is a fact.

C is wrong, it is a question.

D is wrong, it is an observation,

Answer:B. If mosquitoes are given a light in a dark room, they will fly toward the light.

Explanation:

Provide an acidic or basic environment to optimize digestion hydrochloric acid (HCl).

Food is broken down into more digestible, smaller pieces throughout the digestion process so that the body can absorb and use them.

The digestive system's secretions produce the acidic or basic environment necessary for effective digesting. In order to create a highly acidic environment, the stomach secretes hydrochloric acid (HCl), which lowers the pH of the stomach.

The small intestine, on the other hand, is kept at a pH that is somewhat basic to enhance the activity of the digestive enzymes that break down carbs, proteins, and lipids.

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Answer:

Can you translate for me please

Answer:

Ver explicacion

Explanation:

Cristalización y disolución de cloruro de sodio: equilibrio físico dinámico

Conversión de oxígeno gaseoso en ozono - equilibrio químico

Condensación y evaporación de un líquido - equilibrio físico dinámico

Reacción entre H2 y 12 para producir Hl - equilibrio químico

Una solución saturada de azúcar - equilibrio físico dinámico

El equilibrio alcanzado en los procesos físicos se llama procesos físicos. El equilibrio físico se llama. Ejemplos de tales procesos físicos incluyen; condensación y evaporación, cristalización y disolución, etc.

Un equilibrio dinámico ocurre en un sistema químico cuando la reacción directa y la reacción inversa se desarrollan a la misma velocidad.

Answer:

B

Explanation:

The more energy levels that are occupied by electrons, the larger

the atomic radius.

The more energy levels that are occupied by electrons, the larger

the atomic radius. Hence, option B is correct.

The atomic radius is calculated by measuring the distance between the nuclei of two identical atoms bonded together.

In general, the atomic radius decreases across a period and increases down a group. Across a period, effective nuclear charge increases as electron shielding remain constant.

Hence, the observed trend in atomic radius as you move down is that the more energy levels that are occupied by electrons, the larger

the atomic radius.

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The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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The composition of the sigma bonds in methane i.e. the atomic orbits comprise the molecular orbit is σsp³-sp³

Methane is a one-carbon compound in which carbon is attached to four hydrogen atoms by single bonds. It is colorless, odorless, non-toxic, but a flammable gas (bp -161°C). It serves as a fossil fuel, a member of greenhouse gases, and a bacterial metabolite. In the methane molecule, a carbon atom forms covalent bonds with four different hydrogen atoms. There are no lone pairs of electrons in carbon atoms. So the 4 hydrogen atoms are at the 4 corners of the tetrahedron and the carbon is at the center of the tetrahedron. Hybridization in the methane molecule occurs by mixing one orbital with three p-orbitals. Each orbital consists of an unpaired electron. Carbon's s orbital and three p orbitals overlap with her 1s orbital of hydrogen to form a bond. Therefore, methane hybridizes to sp3 resulting in tetrahedral geometry. The methane molecule is non-polar. In particular, the dipole moment of methane is zero. A dipole moment of zero means that the "center of negative charge" in the molecule corresponds to the "center of positive charge".

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Answer: It has to be stratosphere because This region of the atmosphere is called the stratosphere. It is present in stratosphere According to NASA earth have 6 atmospheric layers..the layer just above the earth is troposphere and above this layer is the stratosphere.

Explanation:

Answer:

You get some type of pressure that you start to feel in your muscles and joints from gravity and movement. How do they say it? Something called "seat-of-the-pants" (something like that). You get some type of pressure, and your body senses it, and it knows when you are upside-down or not, because if you're not, then you won't get any pressure in your muscle.

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Have a supercalifragilisticexpialidocious day!

Draw each isomer and take into account all potential isomerisms. [Cr(NH3)5(NO2)]Cl2, the original compound; [Cr(NH3)5(ONO)] Cl2 (linkage isomerism via NO2), [Cr(NH3)5Cl)Cl(NO2) (ionization isomerism).

The two basic types of isomerism are stereoisomerism and spatial isomerism, in which the bonds between the atoms are the same but their relative positions are different, and structural as well as constitutional isomerism, in which the bonds between the atoms differ.

Their bonding patterns and the way they occupy three-dimensional space allow you to distinguish between them. By examining the bonding patterns, distinguish structural (constitutional) isomers. While the atoms in the compounds are identical, their connections create various functional groups.

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The partition coefficient of the benzene-water extraction mixture for caffeine is approximately 2.5. The partition coefficient, often denoted as P, is a measure of the distribution of a solute between two immiscible phases, such as benzene and water in this case.

It is calculated by dividing the concentration of the solute in one phase by its concentration in the other phase.

Given that 100 g of benzene dissolves 5.5 g of caffeine and 100 g of water dissolves 2.2 g of caffeine, we can calculate the partition coefficient as follows:

P = (Concentration of caffeine in benzene) / (Concentration of caffeine in water)

To calculate the concentrations, we divide the mass of caffeine by the mass of the solvent:

Concentration of caffeine in benzene = 5.5 g / 100 g = 0.055 g/g

Concentration of caffeine in water = 2.2 g / 100 g = 0.022 g/g

Now we can calculate the partition coefficient:

P = (0.055 g/g) / (0.022 g/g) ≈ 2.5

Therefore, the partition coefficient of the benzene-water extraction mixture for caffeine is approximately 2.5.

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