Clasifica los siguientes elementos en metales, no metales, metaloides , o gases , nobles : flúor , azufre , nitrogeno , cloro , magnesio , helio , sodio , bromo , silicio , telurio

Answer:

B. Food can be produced in larger amounts for more people to eat.

Explanation:

Commercial farming mechanizes operations controls diseases and pests, enabling farms to produce more

Answer:

food can be produced in larger amounts for more people to eat.

Explanation:

you're welcome

Answer:

\(\boxed {\boxed {\sf 2.73 \ g \ He}}\)

Explanation:

We are asked to find the mass of helium gas given a volume.

1 mole of any gas occupies a volume of 22.4 liters. So, 1 mole of helium gas contains 22.4 liters of helium. Create a ratio using this information.

\(\frac {1 \ mol \ He }{ 22.4 \ L \ He}\)

We are converting 15.3 liters of gas to moles, so we multiply by that value.

\(15.3 \ L \ He *\frac {1 \ mol \ He }{ 22.4 \ L \ He}\)

The units of liters of helium (L He) cancel.

\(15.3 *\frac {1 \ mol \ He }{ 22.4}\)

\(\frac {15.3}{22.4} \ mol \ He\)

\(0.6830357143 \ mol \ He\)

The molar mass is the mass of 1 mole of a substance. These values are found on the Periodic Table as atomic masses, but the units are grams per moles. Look up the molar mass of helium.

Create another ratio using the molar mass.

\(\frac {4.0026 \ g \ He}{1 \ mol \ He}\)

Multiply by the number of moles we calculated.

\(0.6830357143 \ mol \ He *\frac {4.0026 \ g \ He}{1 \ mol \ He}\)

The units of moles of helium (mol He) cancel.

\(0.6830357143*\frac {4.0026 \ g \ He}{1 }\)

\(2.73391875 \ g \ He\)

The original measurement of volume has 3 significant figures, so our answer must have the same.

For the number we calculated, that is the hundredths place.

The 3 in the thousandths place to the right (2.73391875) tells us to leave the 3 in the hundredths place (2.73391875).

\(2.73 \ g \ He\)

15.3 liters of helium gas is approximately 2.73 grams of helium.

Answer:

Sodium chloride is an ionic compound which makes it stronger and have a higher melting and boiling point. Candle wax is a covalent compound so it has a low melting point.

Explanation:

The electron configuration of Si and Y are as follows;

Si = [Ne] 3s² 3p²

Y = [Kr] 4d¹5s²

Electron configuration of an element describes how electrons are distributed in its atomic orbitals.

Electron configurations of atoms follow a standard notation in which all electron-containing atomic subshells (with the number of electrons they hold written in superscript) are placed in a sequence.

For example, the electron configuration of sodium is 1s²2s²2p⁶3s¹.

The electron configuration of the following elements are given above.

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Answer:

Intraspecific competition examples,

Interspecific competition examples,

and what causes it to happen. Skip to the bottom for shortest answer.

But why does this happen? ↓

This competition happens because of limiting factors in the ecosystem, and general competition. Animals compete for their food because they need this food to survive. If they do not compete for the food, the other animal will get the food and the opposing animal will be left hungry. These are the main reasons why animals will compete for their resources.

In conclusion,

In a short sum, competition happens because animals need food, and when they can't get food, they compete.

Answer:H2o

Explanation:

Answer:

im not sure

Explanation:

Answer:

One of the key findings of the Kewalo Basin Marine Mammal Laboratory is that dolphins have complex social behaviors and are able to form strong bonds with other dolphins. They are able to communicate with each other using a variety of vocalizations and gestures, and they are also able to learn and mimic the behaviors of other dolphins.

Overall, the findings of the Kewalo Basin Marine Mammal Laboratory suggest that dolphins are highly intelligent animals with advanced social and cognitive abilities. These findings highlight the need for further research on dolphin intelligence and the importance of protecting these intelligent and fascinating animals.

The unrealized gains and losses on available-for-sale securities are: The correct answer is: reported on the portfolio of investments.

Unrealized gains and losses on available-for-sale securities are reported on the portfolio of investments. Available-for-sale securities are financial instruments that are not classified as trading securities or held-to-maturity securities. These securities are typically held by companies as investments for an extended period. When it comes to available-for-sale securities, their fair values fluctuate over time. These fluctuations lead to unrealized gains or losses. However, unlike trading securities, which are actively bought and sold for short-term gains, available-for-sale securities are intended for longer-term investment purposes.

Accounting standards require that the unrealized gains and losses on available-for-sale securities be reported as a separate component of comprehensive income. This means that these gains and losses are not recognized in the income statement but are reported as part of the comprehensive income statement or in the equity section of the balance sheet. Therefore, the most accurate statement is that the unrealized gains and losses on available-for-sale securities are reported on the portfolio of investments, reflecting the overall performance of the investment portfolio rather than on individual securities.

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hello my name is bob free give me the free give me th efree points

Explanation:

Answer:

Explanation:

The nucleus of an atom contains protons and neutrons.

Protons have positive charges, neutrons have neutral charges (no charge), and electrons have negative charges.  That is why when you determine net charge of atom you only look at the proton to electron ratio since the neutrons don't matter when it comes to charge.

I hope this helps.  Let me know in the comments if anything is unclear.

Answer:

Chemical compounds all have different melting points.

Explanation:

chemical compounds all have different freezing and boiling points. Different chemical compounds means they will have different chemical structures.

Answer:

D. Solids

Explanation:

Answer:

B

Explanation:

When water evaporate, it moves faster

Answer:

Please provide answer options. :)

Due to its higher density than water, dichloromethane creates an organic layer below the aqueous layer as opposed to above it as other solvents do.

Which compound is dichloromethane?

Organochlorine chemical dichloromethane (DCM, often known as methylene chloride or methylene bichloride) has the formula CH2Cl2. A common solvent is this colorless, flammable liquid with a sweet, chloroform-like odor. Although it is polar and miscible with many organic solvents, it is not miscible with water.

Methylene chloride, often known as dichloromethane, is an organic halogen compound that is colorless, volatile, and essentially nonflammable. It is frequently employed as a solvent, particularly in paint-stripping formulas.

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The reaction is spontaneous at all temperatures when ΔH < 0 and ΔS > 0. The answer is c.

For a spontaneous reaction, the Gibbs free energy change (∆G_rxn) must be negative. The Gibbs free energy (∆G_rxn) is related to enthalpy (∆H_rxn) and entropy (∆S_rxn) changes through the equation: ∆G_rxn = ∆H_rxn - T∆S_rxn, where T is the temperature in Kelvin.

A reaction is spontaneous at all temperatures when ∆G_rxn is negative, which occurs when ∆H_rxn is negative and ∆S_rxn is positive. This is because the negative ∆H_rxn term favors the reaction to occur, while the positive ∆S_rxn term increases the number of accessible microstates and favors the randomness of the system.

Among the given options, only option c, where ∆H < 0 and ∆S > 0, satisfies the condition for a spontaneous reaction at all temperatures.

In the other options, either ∆H or ∆S or both are not in favor of a spontaneous reaction at all temperatures.

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Answer:

0.54 J/goC

Explanation:

Recall that we define the heat transferred as ;

H= mcθ

Where;

H= heat transferred = 112300J

m= mass of the metal= 240g or 0.24 Kg

c= specific heat capacity of the metal = the unknown

θ= change in temperature = (880°C-13°C) = 867°C

Substituting values and making the specific heat capacity the subject of the formula;

c= H/mθ

c= 112300/ 240×867

c= 0.54 J/goC

Hence, the specific heat capacity of the metal is 0.54 J/goC.

The rock layers are described as follows:

Igneous rocks: These rocks form when molten rock (magma or lava) cools and solidifies. They can be either intrusive, meaning that they formed below the earth's surface, or extrusive, meaning that they formed above the earth's surface. Examples of igneous rocks include granite, basalt, and obsidian.

Note that in the above case, It looks like this table is describing the relative ages and characteristics of different rock layers. The oldest rock layer is at the bottom and the youngest rock layer is at the top.

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The chemical equations, IUPAC name, and Structural formulas are given below.

i. Chemical equations:

a) Conversion of unsaturated compound B to compound C:

B + HBr → C (Addition of hydrogen bromide to unsaturated B to form bromohexane C)

b) Conversion of compound C to compound D:

C + Na + Ether → D (Reaction of bromohexane C with sodium metal in the presence of ether to form compound D)

ii. IUPAC names:

Compound C: Bromohexane

Compound D: Hexane

iii. Structural formulae of positional isomers of compound C:

Positional isomers of bromohexane can have different bromine atoms attached at different positions along the hexane chain. Here is an example of one positional isomer of bromohexane:

1-Bromohexane:

CH3CH2CH2CH2CH2CH2Br

2-Bromohexane:

CH3CH2CH2CH2CH2CHBr

3-Bromohexane:

CH3CH2CH2CH2CHBrCH3

Therefore, the chemical equations, IUPAC name, and Structural formulas are provided above.

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The nonbenzodiazepine hypnotics are a class of medications used to treat insomnia, including drugs such as zolpidem, eszopiclone, and zaleplon. Common side effects of these medications can include dizziness, headache, nausea, and daytime drowsiness, among others.

Nonbenzodiazepine hypnotics are a relatively new class of drugs used to treat insomnia, a common sleep disorder. These medications work by binding to specific receptors in the brain that regulate sleep and wakefulness.

Unlike benzodiazepines, which have a high risk of dependence and abuse, nonbenzodiazepine hypnotics are generally considered to be safer and less addictive.

The most commonly prescribed nonbenzodiazepine hypnotics include zolpidem (Ambien), eszopiclone (Lunesta), and zaleplon (Sonata). While these medications can be effective for treating insomnia, they can also cause a number of side effects.

These can include dizziness, headache, nausea, diarrhea, and daytime drowsiness. In some cases, more serious side effects can occur, such as allergic reactions or changes in behavior, including sleepwalking or other forms of abnormal behavior during sleep.

As with any medication, it is important to take nonbenzodiazepine hypnotics only as directed by a healthcare provider and to report any side effects or concerns promptly. It is also important to follow safe sleep practices, such as avoiding alcohol and caffeine before bedtime, to help maximize the effectiveness of these medications.

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Answer:

The moving train

Explanation:

Kinetic energy is energy being used right now. So, the only object using energy right now is the moving train

Good luck on the rest of the test!

The number of protons in element Y is 8, as its atomic number is 8, which determines the number of protons in an atom.

The atomic number of an element represents the number of protons in its nucleus. Therefore, element Y has 8 protons. The fact that the nucleus of atom Y is 18 times heavier than that of hydrogen is not directly relevant to determining the number of protons. The mass of an atom is primarily determined by the number of protons and neutrons in its nucleus.

However, the information provided can be used to determine the mass number of atom Y, which is the sum of its protons and neutrons. Assuming that atom Y is neutral, it must have 8 electrons to balance the charge of its 8 protons. Therefore, the complete atomic symbol of element Y is 8Y, indicating that it has 8 protons and an atomic mass of approximately 18 (since it has 10 neutrons).

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Answer:

The higher the activation energy, the slower the chemical reaction will be.

Explanation:

your welcome

Answer:

The activation energy of a chemical reaction is closely related to its rate. Specifically, the higher the activation energy, the slower the chemical reaction will be. This is because molecules can only complete the reaction once they have reached the top of the activation energy barrier.

Explanation: Each and every chemical reaction require some amount of activation energy to begin. The activation energy enables the reactants to move and overcome forces of repulsion. The subsequent collisions between atoms facilitates the breaking of existing bonds and the formation of new ones.

Answer:

PCl5 <-> PCl3 + Cl2

PCl5 decomposes into PCl3 and Cl2 according to the equation above. A pure sample of Pcl5 is placed in a rigid, evacuated 1.00 L container. The initial pressure of the PCl5 is 1.00 atm. The temperature is held constant until the PCl5 reaches equilibrium with its decomposition products. The figures below show the initial and equilibrium conditions of the system.

As the reaction progresses toward equilibrium, the rate of the forward reaction

A) increases until it becomes the same as the reverse reaction rate at equilibrium

B) stays constant before and after equilibrium is reached

C) decreases to become a constant nonzero rate at equilibrium

D) decreases to become zero at equilibrium

Explanation:

At equilibrium, both forward and backward reactions take place with constant speed.

The reaction will never cease.

Due to this reason chemical equilibrium is called dynamic in nature.

At equilibrium:

the rate of forward reaction = rate of backward reaction

As the reaction progresses toward equilibrium, the rate of the forward reaction decreases to become a constant nonzero rate at equilibrium.

Answer is option C).

When a system is in a state of chemical equilibrium, neither the reactant concentration nor the product concentration changes over time, nor does the system exhibit any further changes in its attributes. Here the correct option is C.

The system reaches a condition of chemical equilibrium when the rate of the forward reaction equals the rate of the reverse reaction. The system is considered to be in a state of dynamic equilibrium when the concentrations of the reactants and products do not change further as a result of the equal rates of the forward and reverse processes.

Equilibrium is impacted by a number of variables, including temperature, pressure, and the system's concentration. Here at equilibrium the rate of the forward reaction decreases to become a constant nonzero rate at equilibrium.

Thus the correct option is C.

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1. The limiting reagent is sulfur trioxide, SO₃ and the excess reagent is water, H₂O

2. The mass of the excess reagent leftover is 14.92 g

3. The mass of sulfuric acid, H₂SO₄ is produced is 8.06 g

The limiting and excess reagent can be obtained as follow:

SO₃ + H₂O -> H₂SO₄

From the balanced equation above,

80 g of SO₃ reacted with 18 g of H₂O

Therefore,

6.58 g of SO₃ will react with = (6.58 × 18) / 80 = 1.48 g of H₂O

From the above calculation, we can see that only 1.48 g of H₂O out of 16.4 g is needed to react completely with 6.58 g SO₃.

Thus, the limiting reagent is SO₃ and the excess reagent is H₂O

The mass of the excess reagent leftover can be obtained as follow:

Mass of excess reagent, H₂O leftover = Mass given - mass reacted

Mass of excess reagent, H₂O leftover = 16.4 - 1.48

Mass of excess reagent, H₂O leftover = 14.92 g

The mass of H₂SO₄ produced can be obtained as illustrated below:

SO₃ + H₂O -> H₂SO₄

From the balanced equation above,

80 g of SO₃ reacted to produce 98 g of H₂SO₄

Therefore,

6.58 g of SO₃ will react to produce = (6.58 × 98) / 80 = 8.06 g of H₂SO₄

Thus, the mass of H₂SO₄ produced is 8.06 g

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ANSWER

The initial volume of the acid is 260mL

EXPLANATION

Given that;

The final volume of the ethanoic acid is 4.5L

The final concentration of the ethanoic acid is 1.0 mol/L

The initial concentration of the ethanoic acid is 17.4 mol/L

Follow the steps below to find the volume of the ethanoic acid

Step 1; Apply the dilution formula

Step 2; Substitute the given data into the formula

Therefore, the initial volume of the acid is 260mL

Colors in the lab are arranged based on their energy, frequency, and wavelength. Blue-green has the highest energy, frequency, and shortest wavelength, while red has the lowest energy, frequency, and longest wavelength. This arrangement visually represents the colors' characteristics.

Based on the information provided, we can arrange the colors observed in the lab from highest energy to lowest energy, highest frequency to lowest frequency, and shortest wavelength to longest wavelength as follows:

1. Highest energy to lowest energy: Blue-green, Lilac, Yellow, Orange-red, Red

2. Highest frequency to lowest frequency: Blue-green, Lilac, Yellow, Orange-red, Red

3. Shortest wavelength to longest wavelength: Blue-green, Lilac, Yellow, Orange-red, Red

Blue-green has the highest energy, highest frequency, and shortest wavelength among the observed colors, while red has the lowest energy, lowest frequency, and longest wavelength.

These arrangements are based on the concept that higher energy corresponds to higher frequency and shorter wavelengths, while lower energy corresponds to lower frequency and longer wavelength. This relationship is described by the electromagnetic spectrum, where colors are arranged in order of increasing energy, frequency, and decreasing wavelength.

In conclusion, the colors observed in the lab have been arranged based on their energy, frequency, and wavelength. Blue-green has the highest energy, highest frequency, and shortest wavelength, while red has the lowest energy, lowest frequency, and longest wavelength.

This arrangement provides a visual representation of the colors' characteristics in terms of their energy, frequency, and wavelength.

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Friction acts in the opposite direction to the direction of an object's motion. Therefore, option (b) is correct.

Friction can be defined as the resistance provided by the surfaces that are in contact when they pass over each other. Friction offers the traction that is required to walk without slipping.

Friction can be described as a force that is dependent on external factors.  Friction depends upon the nature of the two surfaces that are in contact and on the smoothness or roughness of the two contacted surfaces. When one body moves over the surface of another, these irregularities on the surface of the bodies get entangled and develop friction.

Friction depends upon the force that is exerted on these surfaces and increases when the force is applied along with the irregularities. Types of Friction are Rolling friction, Static friction, Sliding friction, and Fluid friction.

The force of friction acts in the opposite direction to the direction of an object's motion.

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