PLZ HELP HURRY PLZZZZZ WILL GIVE BRAINLIEST

Explanation:

From the question , arranging the organization levels from largest to smallest we have

Hope this helps you

Answer:

Organism , organ system , organ , tissue , cell

Explanation:

I took the test but it was backwards hope that helps!

A transformation of chemical energy to electrical energy occurs when there is a chemical reaction between metals and nonmetals.

The movement of electrons from one atom to another is what results in electrical energy.

A battery is a device that converts chemical energy contained within its active materials directly into electric energy by means of an electrochemical oxidation-reduction (redox) reaction. This type of reaction involves the transfer of electrons from one material to another via an electric circuit.

Hence, option C is correct.

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Answer:

Explanation:

The following chart presents the number of new and abandoned hazardous waste sites found in various regions in the United States by the 1990s.

A bar graph titled U S Hazardous Waste Sites by Region has region on the x-axis, and number of hazardous sites on the y-axis, from 0 to 350 in increments of 70. New England, 75; Mid-Atlantic, 290; N E Central, 220; N W Central, 100; S Atlantic, 170; S E Central, 45; S W Central, 50; Mountain, 65; Pacific, 150.

Based on this data, in which four regions would you advise someone to live? Which would be the safest for someone to live?

a.

SE Central, SW Central, Mountain, and New England

b.

Mid-Atlantic, NE Central, NW Central, and S. Atlantic

c.

Mid-Atlantic, NE Central, S. Atlantic, and Pacific

d.

NW Central, New England, Pacific, and S. Atlantic

The region that has the largest number of the hazardous waste sites is of the mid-Atlantic which is about 290 sites. Hence option D is correct.

A hazardous waste region is a site that consists of substances that are harmful to humans' health and the environment.

These sites have hazardous chemicals and waste matter that can be toxic and hence are the dumping grounds for various countries as per the graph the mid-Atlantic is the largest site for such activity.

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The percent yield of the reaction is 45.44%

Percentage yield is basically,

 \(\rm Percent\ yield\ = \frac{actual\ yield}{theoretical\ yield} \times 100\)

2 NaOH + H₂SO₄ → Na₂SO₄ + 2 H₂O

To calculate the theoretical yield, consider the stoichiometry of the reaction.

2 moles of NaOH reacts with 1 mole of H₂SO₄ to give 1 mole of Na₂SO₄ and 2 moles of H₂O. The mole ratio of H₂SO₄ and Na₂SO₄ is 1:1

For this mole ratio to be useful, convert the given concentration of H₂SO₄ into moles.  

     \(\rm Molarity\ =\ \frac{No.\ of\ moles}{Volume\ of\ solution (L)}\)

            \(\rm 3.10\ =\ \frac{No.\ of\ moles}{0.125}\)

\(\rm No.\ of\ moles\ =\ 3.10 \times 0.125\\)

                     \(=\ 0.38\)

Since, mole ratio of H₂SO₄ and Na₂SO₄ is 1:1

Amount of Na₂SO₄ formed would be also 0.38 mol

Convert this amount in moles to amount in grams

\(\rm No.\ of\ moles\ =\ \frac{Mass\ formed\ }{Molecular\ mass}\)

\(\rm Mass\ formed\ =\ No.\ of\ moles\times molecular\ mass\)

                     \(\rm =\ 0.38\times 142.04\)

                     \(\rm =\ 53.97\ grams\)

Theorical yield of Na₂SO₄ is 53.97 grams

Therefore,   \(\rm Percent\ yield\ = \frac{actual\ yield}{theoretical\ yield} \times 100\)

                                          \(\rm =\ \frac{24.5}{53.97}\times 100\)

                                          =  45.44%

The percent yield of the reaction is 45.44%

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The required partial pressure of argon gas present in the mixture is 1.02 atm.

Dalton's law of gas states that total pressure of any mixture of gas is sum of the partial pressure of all the gases present in that mixture.

Given that,

Total pressure of mixture = 2.4 atm

Partial pressure of argon = ?

Partial pressure of oxygen = 128 mmHg = 0.168 atm

Partial pressure of helium = 167.5 mmHg = 0.220 atm

Partial pressure of neon = 760 mmHg = 1 atm

On putting all these values according to the definition we get the partial pressure of argon gas as:
Partial pressure of argon = 2.4 - (0.168 + 0.22 + 1) = 1.02 atm

Hence required partial pressure of argon gas is 1.02 atm

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Potential energy diagram for a combustion reaction:. CLICK ON IMAGE.

In a typical combustion reaction, the reactants (e.g. a fuel and an oxidizer) are initially at a relatively high potential energy. As the reaction proceeds, the potential energy of the system decreases, and the products (e.g. carbon dioxide and water vapor) are at a lower potential energy than the reactants. The difference in potential energy between the reactants and products corresponds to the heat released during the reaction.

The diagram shows the initial energy level of the reactants, the activation energy required to initiate the reaction, and the final energy level of the products. The activation energy is the minimum amount of energy required for the reaction to occur.

Once the reactants have absorbed enough energy to reach the activation energy threshold, the reaction proceeds spontaneously and releases energy as it progresses to the lower-energy products.

Note that the shape of the potential energy diagram can vary depending on the specific reaction and the reaction conditions. For example, some reactions may have more complex energy profiles with multiple intermediate steps or energy barriers.

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According to Arrhenius definition of acids, \(NH4^+\) is an acid.

According  to Arrhenius  definition of acids and bases, acid is any substance that produces hydrogen ion in solution as its only positive ion.

Following this definition, let us now consider what happens when \(NH4^+\) is introduced into a water;

\(NH4^+\)(aq)-------> NH3(aq) + \(H^+\)(aq)

Hence, according to Arrhenius definition of acids, \(NH4^+\) is an acid.

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Benzoic acid and sodium nitrate can be separated through extraction technique.

Extraction involves the transfer of compound from either solid or liquid into a different solvent. This technique uses inorganic chemistry to isolate or remove a target compound.

The separation of sodium nitrate and benzoic acid is based on their polarity differences and any other components of the mixture.

Therefore, extraction technique can be used to separate a mixture of benzoic acid and sodium nitrate.

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Answer:

How do amoeba respire.

how do plants respire.

Answer: Yes

Explanation:

Answer:

please add answers

Explanation:

Answer:

x/2

Explanation:

X = 2 molecules of H2

For 2 molecules of H2, there's only 1 molecule of O2. Meaning, there's twice the amount of H2, so O2 = x/2 molecules.

I hope I'm understanding this question right.

Answer:

Cis-2-methyl-3-hexene

Cis-2-methyl-3-hexene is the IUPAC name for the compound shown here.

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Erosion by water during the rainy season can be a significant natural phenomenon. When it rains, water flows over the land, picking up soil particles and carrying them along with it.

Water is a clear, colorless, odorless, and tasteless liquid that is essential for life. It is a chemical compound made up of two hydrogen atoms and one oxygen atom, with the chemical formula H2O. Water is the most abundant substance on Earth, covering approximately 71% of its surface.

Water is a unique substance because of its molecular structure, which allows it to exist in all three physical states - solid, liquid, and gas - at temperatures and pressures commonly found on Earth. It has a high heat capacity, meaning it can absorb and release large amounts of heat without changing temperature significantly. This property is important for regulating the Earth's climate and for maintaining the temperature of living organisms.

Water is essential for many biological processes, such as hydration, digestion, and metabolism. It also plays a crucial role in the Earth's water cycle, where it evaporates from bodies of water and plants, condenses into clouds, and falls back to the surface as precipitation.

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Answer: 16g/mol; O2

Explanation:

The gas has a volume of 2.5L at STP, so the number of moles can be determined as follows.

n=2.5L×1mol/22.4L=0.1116mol

The mass is given to be 3.571g. The molar mass of the unknown gas can be determined by dividing grams by moles.

3.571g/0.1116mol=32.00g/mol

The gas is a homonuclear diatomic gas, so the gas must contain two atoms with a molar mass of 32g/mol/2=16g/mol. This is the molar mass of the element oxygen, so the gas is diatomic oxygen, O2.

The molecular formula of the gas is O₂

We'll begin by calculating the number of mole of the gas that occupied 2.5 L at stp. This can be obtained as follow:

22.4 L = 1 mole of a gas

Therefore,

2.5 L = 2.5 / 22.4

Next, we shall determine the molar mass of the gas. This can be obtained as follow:

Mass of gas = 3.571 g

Mole of gas = 0.1116 mole

\(Mole = \frac{mass}{molar mass} \\\\0.1116 = \frac{3.571}{molar mass }\)

Cross multiply

0.1116 × molar mass = 3.571

Divide both side by 0.1116

Molar mass = \(\frac{3.571}{0.1116}\\\\\)

Since the gas is a homonuclear diatomic gas (i.e a molecule of the same element), the molar mass of the element that makes up the gas = 32/2 = 16 g/mol

Comparing the molar mass of the element (i.e 16 g/mol) that makes up the gas with those in the periodic table, the element is oxygen.

Therefore the gas is oxygen gas and the molecular formula  is O₂

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There is a double bond between the carbon atoms and a lone pair on oxygen.

The term Lewis structure has to do with the structure that shows the arrangement of atoms in a compound. It is normal that the structure would be composed of the symbols of the elements and the bonds that they form as dots or sometimes as a single line to show shared electrons.

Now we can see that the compound C2H2O is a compound that contains a double bond between the carbon atoms. There is a lone pair of electron that resides on the oxygen atom. The structure of this compound is shown in the image attached.

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There are approximately \(2.76 * 10^{24\) ammonia molecules in the given sample.

To calculate the number of ammonia molecules in the sample, we need to use Avogadro's number and the molar mass of ammonia.

The molar mass of ammonia \((NH_3)\) can be calculated by adding up the atomic masses of nitrogen (N) and hydrogen (H):

Molar mass of \(NH_3\) = (1 x atomic mass of N) + (3 x atomic mass of H)

              = (1 x 14.01 g/mol) + (3 x 1.01 g/mol)

              = 14.01 g/mol + 3.03 g/mol

              = 17.04 g/mol

Now, we can calculate the number of moles of ammonia in the sample using the formula:

Number of moles = Mass of the sample / Molar mass

Number of moles = 78.25 g / 17.04 g/mol

              ≈ 4.5865 mol (rounded to four decimal places)

Finally, we can use Avogadro's number, which represents the number of particles (atoms, molecules, etc.) in one mole of a substance. Avogadro's number is approximately \(6.022 * 10^{23\) particles/mol.

Number of ammonia molecules = Number of moles x Avogadro's number

Number of ammonia molecules ≈ 4.5865 mol x (\(6.022 * 10^{23\) molecules/mol)

                           ≈ \(2.76 * 10^{24\) molecules (rounded to two significant figures)

Therefore, the provided sample contains roughly \(2.76 * 10^{24\) ammonia molecules.

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The number of ammonia molecules in the sample is approximately 2.764 x \(10^{24}\) molecules.

To calculate the number of ammonia molecules in a given sample, we need to use Avogadro's number and the molar mass of ammonia.

The molar mass of ammonia (NH3) is calculated as follows:

Molar mass of N = 14.01 g/mol

Molar mass of H = 1.01 g/mol

Total molar mass of NH3 = 14.01 g/mol + (3 * 1.01 g/mol) = 17.03 g/mol

Now, we can calculate the number of moles of ammonia in the sample:

Number of moles = Mass of sample / Molar mass of NH3

Number of moles = 78.25 g / 17.03 g/mol = 4.594 moles

Next, we use Avogadro's number, which states that there are 6.022 x \(10^{23}\) molecules in one mole of a substance.

Number of molecules = Number of moles * Avogadro's number

Number of molecules = 4.594 moles * 6.022 x \(10^{23}\) molecules/mol = 2.764 x \(10^{24}\) molecules

Therefore, there are approximately 2.764 x \(10^{24}\) ammonia molecules in the given sample of 78.25 g.

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Answer: e. 4.8 h

Explanation:

Expression for rate law for first order kinetics is given by:

\(t=\frac{2.303}{k}\log\frac{a}{a-x}\)

where,

k = rate constant  

t = age of sample

a = let initial amount of the reactant  

a - x = amount left after decay process  

a) for rate constant

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

\(t_{\frac{1}{2}}=\frac{0.693}{k}\)

\(k=\frac{0.693}{0.77hr}=0.9hr^{-1}\)

b) for 160.0 g to decay to 2.07 g

\(t=\frac{2.303}{0.9}\log\frac{160.0}{2.07}\)

\(t=4.8hr\)

The time  required for a 160.0-g sample of 158Eu to decay to 2.07 g is 4.8 hours

The midpoint theorem states that there is a parallel to the line that joins two sides of a triangle on the third side.

In a given triangle, if there are different sides to a triangle, then the midpoint is parallel to the third side from two sides of the same triangle.

For example:

If E and D are the midpoints of the sides AC and AB.

Then the line DE is said to be parallel to the side BC because the side DE is half of the side BC; i.e. DE = (1/2 * BC).

Hence, we can see that your question is incomplete, so a general overview is given to you about the midpoint theorem and how it is used.

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According to Boyle's law, the pressure in the acetylene tank is 268.33 atmospheres.

Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.

Mathematically, it can be stated as,

P∝1/V or PV=K. The equation states that the product of of pressure and volume is constant for a given mass of gas and the equation holds true as long as temperature is maintained constant.

In the given problem , by substituting values in formula P₁V₁=P₂V₂, P₂=115×7/3=268.33 atmospheres.

Hence, the pressure in acetylene tank is 268.33 atmospheres.

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The largest effect on the population of trout in Wisconsin was caused by the introduction of non-native species into the ecosystem.

The introduction of non-native species into an ecosystem can cause a disruption in the food chain, leading to a decrease in the population of native species. In Wisconsin, the introduction of non-native species such as the brown trout and rainbow trout has had a significant impact on the population of native brook trout.

The non-native species compete with the native brook trout for food and habitat, which has led to a decrease in the brook trout population. This highlights the importance of preserving the natural balance of ecosystems and avoiding the introduction of non-native species.

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The mass of P-32 remaining after 27 days, if the initial mass is 40g is 10.5 g.

The half-life of a radioactive isotope is the amount of time it takes for one-half of the radioactive isotope to decay.

The half-life of a specific radioactive isotope is constant; it is unaffected by conditions and is independent of the initial amount of that isotope.

The number of half lives in 27 days;

n = 27 days/14 days

n = 1.929

The mass of P-32 remaining after 27 days, if the initial mass is 40g;

mass remaining = 40 g / (2^1.929)

mass remaining = 40 g / 3.808

mass remaining = 10.5 g

Thus, the mass of P-32 remaining after 27 days, if the initial mass is 40g is 10.5 g.

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Answer:

D

Explanation:

The ratio of C6H12O6 (which will be referred to as "the carb") to oxygen is 1 to 6, so if we find an answer which has the same ratio, it should be chosen. A is 1:3
B is even worse with a ratio of the carb to oxygen of 1:2
C is the same as B, 1:2
D has a ratio of the carb to oxygen of 1:6, which is what we are looking for.

A full response is that the molecule with 32.1 g of S and 32 g of O has the empirical formula SO2.

Every compound's empirical formula is the simplest whole-number ratio of all of its atom types. It could occasionally be the same as the compound's molecular formula.

By first calculating the masses of each element contained in a compound, it is possible to experimentally ascertain the complex's empirical formula. Afterward, turning each element's mass into a corresponding mole.

To determine the empirical formula of the compound, we need to find the simplest whole-number ratio of the elements in the compound.

Moles of S = mass of S / molar mass of S

Moles of S = 32.1 g / 32.06 g/mol (molar mass of S)

Moles of S = 1.001 mol

Moles of O = mass of O / molar mass of O

Moles of O = 32 g / 15.99 g/mol (molar mass of O)

Moles of O = 2.001 mol

Moles of S in simplest ratio = 1.001 mol / 1.001 mol = 1

Moles of O in simplest ratio = 2.001 mol / 1.001 mol = 2

The empirical formula of the compound is SO2.

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Answer:

LiOH is soluble. Na2CO3 is soluble. Cu(OH)2 is insoluble.

Explanation:

LiOH is soluble. Na2CO3 is soluble. Cu(OH)2 is insoluble.

Answer:

Carbon monoxide + hydrogen ------> methanol

Explanation:

In writing a chemical equation, the substances which react together to form other substances are known as products and are usually placed on the left side of a the equation, whereas the substances that are formed by the reactants are known as products and are usually written on the right side of the equation. A forward pointing arrow is usually placed between the reactants and and products to show how the reaction proceeds from reactants to formation of products.

From the given equation, methanol is the product formed from the reactants carbon monoxide and hydrogen. Therefore, the equation will be:

carbon monoxide + hydrogen -----> methanol

Answer:

C

Explanation:

For my lazy bretheren

Answer:

No and Yes

Explanation:

This is both possible and impossible. When you put your mind to what you believe, you can achieve it through patience and minded values. Your mind can either be your Greatest enemy or your Best Ally.