I WILL GIVE A LOT OF EXTRA POINTS. PLEASE ANSWER ALL OF THEM ​

Answer:

scavenger or consumer

Explanation:

they collect and gather fruits, and different wild life

According to law of conservation of mass, mass is neither created nor destroyed rather it is restored at the end of a chemical reaction.

According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.

In reality,conservation of mass provides approximation  and is a part of classical mechanics.At the end of chemical reaction, the mass of reactants and products is same.

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Options are provided in the given question, so the complete question is as follows:

Laboratory equipment is cleaned and properly stored after use primarily so that —

A. chemical products can be measured and recorded as data

B. time is saved in setting up the next experiment

C. toxic materials can be kept in the laboratory

D. the possibility of contamination in the laboratory is minimized

Answer:

D. the possibility of contamination in the laboratory is minimized

Explanation:

After the completion of experiments, all the laboratory equipment should be cleaned and properly stored to minimize the possibility of contamination in the laboratory.

Any contamination in the laboratory can affect the experiment and will not give an accurate result, so it is important to clean and store the equipment properly.

Hence, the correct answer is "D".

Answer:

2KOH + H2SO4 > K2SO4 + 2H2O

Explanation:

firstly the order speaks, you can't have something like OKOH so the other two is eliminated. Then check if the remaining reactions balance

The  correctly balanced chemical equation for the reaction of KOH and H₂SO₄ is 2 KOH+H₂SO₄ → K₂SO₄+2 H₂O.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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: PM2.5 is defined as the mass concentration of particles in the air less than or equal to 2.5 micrometers in diameter.Question 15: False, carbon dioxide (CO2) is not considered a criteria air pollutant.

Question 16: The closest answer is 50%, but the exact percentage is not provided in the question.Question 17: The term "photochemical smog" is most synonymous with ozone (O3), which is a criteria air pollutant.Question 18: True, attainment of ambient air quality standards requires that measured concentrations at all monitoring stations within an air district are below ambient air standards.

Question 14 asks about the definition of PM2.5. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 micrometers. It represents the mass concentration of particles suspended in the air, which are small enough to be inhaled into the respiratory system and can have adverse health effects.

Question 15 states whether carbon dioxide (CO2) is a criteria air pollutant. Criteria air pollutants are a set of pollutants regulated by environmental agencies due to their detrimental impact on air quality and human health. However, carbon dioxide is not considered a criteria air pollutant because it does not directly cause harm to human health or the environment in the same way as pollutants like ozone or particulate matter.

Question 16 asks about the percentage of carbon monoxide (CO) emissions from mobile sources in Santa Clara County. While the exact percentage is not provided in the question, the closest answer option is 50%. However, it is important to note that the precise percentage may vary depending on specific local conditions and emissions sources.

Question 17 inquires about the criteria air pollutant most synonymous with the term "photochemical smog." Photochemical smog is primarily associated with high levels of ground-level ozone (O3). Ozone is formed when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, creating a hazy and polluted atmospheric condition.

Question 18 addresses the concept of "attainment" of ambient air quality standards. To achieve attainment, measured concentrations of pollutants at all monitoring stations within an air district must be below the established ambient air quality standards. This ensures that the air quality in the given area meets the required standards for protecting human health and the environment.

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Scientists have predicted that long-term effects of climate change will include a decrease in sea ice and an increase in permafrost thawing, an increase in heat waves and heavy precipitation, and decreased water resources in semi-arid regionsClimate change affects human health and wellbeing through more extreme weather events and wildfires, decreased air quality, and diseases transmitted by insects, food, and water.Most people of the world feel that climate change is likely to destroy the world's economy, flood cities, cause mass migrations and even cause regional wars. More than half of the world also feels that climate change will cause a new world war, although Europe and the United States think that is less likely

Demerol, also known as Meperidine, is an opioid pain medication prescribed for the relief of moderate to severe pain. When administering medication, it is crucial to be precise in measuring the dose, and in this question, we need to determine how many mL of Demerol 50 mg to administer.

The amount of Demerol that needs to be administered is 25 mg, and the prefilled syringe contains Demerol 50 mg in a 1 mL volume.

We can calculate the required volume using the following formula:  Required volume = Required dose ÷ Concentration of drug in the solutionThe concentration of Demerol is 50 mg per 1 mL.

Therefore:25 mg ÷ 50 mg/mL = 0.5 mLThis means that 0.5 mL of Demerol will be administered to the client.

It is important to ensure that the syringe is correctly labelled with the drug name, strength, dose, and expiration date, and to confirm that the client's medication order matches the prescription before administering the medication.

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The atomic size generally decreases from left to right across a period in the periodic table and increases from top to bottom within a group.

Fluorine (F) is located on the right side of the periodic table and has a small atomic radius due to the strong attraction between the valence electrons and the nucleus. Neon (Ne) is located to the left of fluorine, in the noble gases group, and has a larger atomic radius than fluorine due to its additional electron shell. Sodium (Na) is located to the left of neon, in the alkali metals group, and has a much larger atomic radius due to its much larger atomic size.

Therefore, the correct order of the given elements in decreasing atomic size is:

Na > Ne > F

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Answer:

R = 40 ohms

Explanation:

Two bulbs have a resistance of 20 ohms when working normally.

When they are placed in series, the combined resistance is given by :

R = R₁ + R₂

We have, R₁ = R₂ = 20 ohms

R = 20 +20

= 40 ohms

Hence, the combined resistance of the two bulbs is 40 ohms.

The Wurtz reaction occurs when chloromethane is heated with sodium in the presence of dry ether. The reaction produces two molecules of methane and sodium chloride.

Since it forms a stable complex when reacting with Grignard reagents, ether is also utilised as a solvent. The ionic magnesium-halogen link dissolves the ether's carbon-oxygen bond, creating a stable complex and enhancing the Grignard reagent's reactivity.

Find out how Grignard's reagent affects carbonyl compounds. Based on this, you may use the reaction mechanisms for the specified named reactions to identify the first responding molecule.

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The probability that, in a given week, there are exactly 5 days during which Yannick spends over 6 hours on his phone is approximately 0.176.

The expected number of days (including the final day) until Yannick first spends over 6 hours on his phone is approximately 1.858.

To calculate the probability that there are exactly 5 days during which Yannick spends over 6 hours on his phone in a given week, we can use the binomial distribution. The number of trials is 7 (representing the 7 days in a week), and the probability of success (Yannick spending over 6 hours on his phone) on any given day is approximately 0.2514, as calculated previously.

Using the binomial probability formula, we find P(5 days over 6 hours) ≈ (7 choose 5) * (0.2514^5) * (0.7486²) ≈ 0.176.

To determine the expected number of days until Yannick first spends over 6 hours on his phone, we can utilize the concept of a geometric distribution. The probability of success (Yannick spending over 6 hours) on any given day remains approximately 0.2514.

The expected number of days until the first success can be calculated using the formula E(X) = 1/p, where p is the probability of success. Therefore, E(X) ≈ 1/0.2514 ≈ 3.977. Since we are interested in the expected number of days, including the final day, we add 1 to the result, giving us an expected value of approximately 1.858.

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The following is a characteristic of the modern periodic table:

The elements in each group have similar chemical properties. The modern periodic table is arranged in vertical columns or groups, each with elements that have similar properties due to their electron configurations. These groups are numbered from 1 to 18. For example, all elements in Group 1 (also known as the alkali metals) have one valence electron and are highly reactive metals that readily form ions with a +1 charge. Similarly, Group 17 (also known as the halogens) contains elements that are highly reactive nonmetals that form ions with a -1 charge.

None of the other options given are characteristics of the modern periodic table. A period is a horizontal row, not a column, and the b groups do not contain the representative elements. Also, the a groups do not contain the transition elements.

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The original temperature of the copper sample, assuming that all the heat lost by the copper is gained by the water is 147.08°C.

The temperature in a calorimetry experiment can be calculated using the following formula:

Q = mc∆T

Where;

For a calorimetry;

Q(water) = -Q(metal)

mc∆T (water) = -(mc∆T) (metal)

100 × 4.18 × 4.6 = - (80 × 0.20 × {26.9 - x}

1922.8 = -430.4 + 16x

16x = 2353.2

x = 147.08°C

Therefore, the original temperature of the copper sample, assuming that all the heat lost by the copper is gained by the water is 147.08°C.

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Answer: The answer is B. The pressure inside the tires increased.

Explanation:

The relationship between the pressure, volume, and temperature of a gas is described by the ideal gas law, which is usually written as:

\($$PV = nRT$$\)

where:

- \(\(P\)\) is the pressure,

- \(\(V\)\) is the volume,

- \(\(n\)\) is the number of moles of gas,

- \(\(R\)\) is the ideal gas constant, and

- \(\(T\)\) is the temperature (in Kelvin).

In this case, the volume \(\(V\)\) and the number of moles \(\(n\)\) of air in the tires stay the same. The temperature \(\(T\)\) is increasing. Therefore, for the equation to remain balanced, the pressure \(\(P\)\) must also increase.

So, the answer is B. The pressure inside the tires increased.

The percentage yield is equal to 200.6%.

The balanced equation for the given chemical reaction is :

2C2H + 5O2 → 4CO2 + 2H2O

Let's find the limiting reagent:

Mass of C2H = 120 g

Mass of O2 = 288 g

Molar mass of C2H = 26 g/mol

Molar mass of O2 = 32 g/mol

The number of moles of C2H is equal to:

120 g × 1 mol/26 g = 4.62 mol

The number of moles of O2 is equal to:

288 g × 1 mol/32 g = 9 mol

According to the stoichiometry of the balanced equation, 2 moles of C2H react with 5 moles of O2, so:

If 4.62 moles of C2H is used, then the required amount of O2 would be:

5/2 × 4.62 mol = 11.6 mol

We only have 9 mol of O2 which means it is the limiting reagent.

C2H is the excess reagent.

Let's find the mass of water produced:

According to the stoichiometry of the balanced equation,2 moles of H2O is produced per 2 moles of C2H2 moles of H2O is produced per 5 moles of O2If 9 mol of O2 is used, the number of moles of water produced would be:

2/5 × 9 mol = 3.6 mol

The mass of water produced is equal to:

3.6 mol × 18 g/mol = 64.8 g

Therefore, 64.8 g of water can be produced.

The amount of excess reagent is equal to:

4.62 mol - 2/2 × 9 mol = 4.62 - 9

= -4.38 mol

C2H is the excess reagent and it is not possible to have negative amount of a substance.

So, we assume that there is no excess reagent.

If 130 grams of water is produced, then the percentage yield is equal to:

Percent yield = actual yield/theoretical yield × 100

Theoretical yield is equal to 64.8 g

Actual yield is equal to 130 g

Percent yield = 130/64.8 × 100

= 200.6%

Therefore, the percentage yield is equal to 200.6%.

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When a bath bomb comes in contact with water, the baking soda and citric acid react to make carbon dioxide bubbles. This is an acid–base reaction, where baking soda (also called sodium bicarbonate) is a weak base and citric acid is a weak acid.

Answer:

4 sun , planet, moon are the components in the correct order

The process of adding a solid to a  liquid to make a mixture is called Dispersion. The mixture can be a solution or a suspension.

For the mixture to be totally in a state of equilibrium, the mixture has to be a solution, which means that the solid particles have fully dissolved in the liquid, otherwise known as a solvent.

Dispersions could result in different mixtures which are named according to how they appear. An example is a suspension, which appears to be partly dissolved in the liquid to form a semi-solid mixture.

Dispersions could also result in emulsions and colloids, all of which have large particles and are non-crystalline in nature.

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The elements do all the “s” orbital span (go across) in each period is 2. Thus option a is correct.

Elements are defined as  a pure substance made up of only one sort of atom with the same number of protons in its nucleus.

It can also be defined as the a substance that can't be broken down into anything else.

Sublevels are defined as a quantum theory-defined energy level Sublevels are energies associated with electrons in chemistry.

There are mainly four sublevels

Thus, the elements do all the “s” orbital span (go across) in each period is 2. Thus option a is correct.

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Answer:

The element was one of the alkaline metals, the dull appearance comes from the metal reacting with oxygen and oxidizing its outer surface as alkaline are known for their enormous reaction with oxygen in the air and water.

Another ability of this group of elements is the ability to conduct electricity. And they are also easy to cut with a kitchen knife.

Answer:

The mass of 10 moles of helium is: 2.5

The electron configuration of an atom provides information about the arrangement of electrons in its various energy levels or orbitals. Based on this information, it is possible to deduce the identity of an element.

The number of electrons in an atom's outermost energy level, known as its valence electrons, determines many of its chemical properties. The electron configuration reveals the number of valence electrons and their distribution in orbitals. For example, if an element has a completely filled valence shell, it is likely to be inert and have little reactivity. Alternatively, if an element has only one or a few valence electrons, it is more likely to form bonds with other unit to achieve a stable electron configuration. Additionally, the electron configuration can help determine the element's position in the periodic table and its chemical properties, such as its tendency to form ions or react with other elements. Overall, the electron configuration provides important clues about the identity and chemical behavior of a molecule.

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Melting an ionic solid involves freeing the ions from their positions in the ionic crystal and separating them. Since the ions are held together by strong electrostatic attractions, the amount of energy required is large and ionic solids therefore have relatively high melting points.

What are ionic Solids?

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Explanation:

The formula applied here is rydberg's equation (Bohr's equation.)

E = -Rh (1/(nf)^2 - 1/(ni)^2)

where Rh = Rydberg constant = 2.8*10^-18

1 mole = 6.02 * 10^23 particles

nf & ni stand for final & initial principal quantum numbers respectively.

your question lacks the principal quantum numbers.

The alkene with a trans configuration where each carbon has an ethyl group and hydrogen is expected to exhibit two H1 NMR signals.

The alkene with a trans configuration where each carbon has an ethyl group and hydrogen has a specific molecular structure that determines the number of H1 NMR signals it will exhibit.

Here are the steps to determine the number of H1 NMR signals:

1. Identify the number of unique hydrogen atoms in the molecule: In this case, each carbon has an ethyl group and a hydrogen, which means there are two unique hydrogen atoms in the molecule.

2. Determine the symmetry of the molecule: The molecule has a plane of symmetry, which means that the two ethyl groups are identical.

3. Apply the n + 1 rule to determine the splitting of the NMR signal: Since each ethyl group has three chemically equivalent hydrogens, each of the two unique hydrogens in the molecule will be split into a triplet by the three hydrogens on the adjacent carbon.

4. Count the number of H1 NMR signals: The two unique hydrogen atoms will give rise to two separate H1 NMR signals, each consisting of a triplet due to the three adjacent hydrogens in the ethyl group.

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Boyle's Law, Charles' Law, and Avogadro's Law all follow from the principles of the Kinetic Molecular Theory, which describes the behavior of gases based on the motion of their particles.

Boyle's Law states that at a constant temperature, the volume of a gas is inversely proportional to its pressure. According to the Kinetic Molecular Theory, this can be explained by the fact that gas particles are in constant motion and exert pressure on the container walls. When the volume is decreased, the particles collide more frequently with the walls, resulting in an increase in pressure. Similarly, when the volume is increased, the particles collide less frequently, leading to a decrease in pressure. Charles' Law states that at a constant pressure, the volume of a gas is directly proportional to its temperature. According to the Kinetic Molecular Theory, this can be explained by the fact that as the temperature increases, the average kinetic energy of the gas particles also increases. This results in more vigorous motion and increased collisions with the container walls, leading to an expansion of the volume. Conversely, when the temperature decreases, the particles' kinetic energy decreases, leading to a decrease in volume. Avogadro's Law states that equal volumes of gases, at the same temperature and pressure, contain an equal number of particles (molecules or atoms). This law can be explained by the Kinetic Molecular Theory, which assumes that gases consist of particles in constant motion. If the temperature and pressure are the same, then the number of particles colliding with the walls of the container and exerting pressure will be the same for equal volumes of gases.

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The reaction of the hydrogen and the chlorine atoms would lead to the formation of HCl

In this reaction, each chlorine molecule (Cl2) breaks apart into two chlorine atoms (Cl), and each hydrogen molecule (H2) breaks apart into two hydrogen atoms (H). These reactive atoms then combine to form hydrogen chloride molecules (HCl).

It's worth noting that the reaction between hydrogen gas and chlorine gas is highly exothermic and releases a significant amount of energy.

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Answer:

See explanation

Explanation:

The general formula used to obtain the frequency of a wave is;

v=λf

where;

v = speed of the wave

λ= wavelength of the wave

f= frequency of the wave.

Now, the speed and wavelength of light in various media are known.

If we plug the value of the speed of light and the wavelength of light into the formula given above, we can obtain the frequency of light.

The frequency of a photon of light can also be obtained from Plank's equation;

E= hf

where;

E =energy of the photon of light

h = Plank's constant

f= frequency of the photon.

This is used when the energy of the photon of light is supplied or can be calculated using the wavelength of light provided in the problem.