An atom has the following electron configuration. 1s22s22p63s23p4 how many valence electrons does this atom have? 2 4 6 12.

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

To synthesize a carboxylic acid from ethyne using the reagents provided, follow these steps: Hydroboration-oxidation, Tautomerization, Nucleophilic addition, Oxidation and Oxidative cleavage.

Hydroboration-oxidation- Reagent 1: Diborane (B2H6); Reagent 2: Hydrogen peroxide (H2O2) and sodium hydroxide (NaOH) Ethyne (C2H2) will undergo hydroboration-oxidation using diborane (B2H6) followed by treatment with hydrogen peroxide (H2O2) and sodium hydroxide (NaOH) to form an alkene (vinyl alcohol) with three bonds to hydrogen and one bond to a hydroxyl group.

Tautomerization- The vinyl alcohol formed in step 1 will undergo tautomerization (keto-enol equilibrium) to form an aldehyde with two carbons. Nucleophilic addition- Reagent 3: n-Propyl Grignard reagent (n-PrMgBr) Add the n-Propyl Grignard reagent (n-PrMgBr) to the aldehyde. This will result in a nucleophilic addition reaction, leading to the formation of a tertiary alcohol with a four-carbon chain.

Oxidation- Reagent 4: Chromic acid (H2CrO4), Oxidize the tertiary alcohol to a ketone using chromic acid (H2CrO4). This will form a ketone with a four-carbon chain. Oxidative cleavage- Reagent 5: Ozone (O3), Reagent 6: Zinc (Zn) and water (H2O), Perform an oxidative cleavage of the ketone using ozone (O3) followed by a reductive workup with zinc (Zn) and water (H2O). This will result in the formation of a carboxylic acid bonded to a four-carbon chain.

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Answer:

small- even though they are huge suns themselves.

Explanation:

The two lines show that these are the only two lines  that do not cause energy transition in the sodium atom. Option D

The spectrum of the sodium atom appears as a doublet. This implies that there are two lines in the spectrum and they appear as bright yellow lines that are not spaced apart in the spectrum.

The  two bright yellow vertical lines in the spectrum shows that these are the only two lines  that do not cause energy transition in the sodium atom.

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Oils like petrol and diesel are fossil fuels. Using oil can be at a disadvantage as spilled oil can harm wildlife and the environment. Thus, option c is correct.

Oil is a nonrenewable fossil fuel that can get depleted when used in excess. It is extracted by many processes through mining underwater and in fields. During these extraction processes, oil spills can occur.

Oil spills directly affect the environment and cause pollution of water and soil. This leakage affects the flora and the fauna that lives in the area and causes their death due to lack of oxygen.

Therefore, option c. oil spills cause harm to wildlife.

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Answer:

Answer: everything except E

Explanation: There was no dramatic change in temperature and i just took the assignment.

According to the law of conservation of matter, matter cannot be created not be destroyed. In this experiment, no matter loss will occur but there will be rapid evolution hydrogen gas and the balloon will expand.

According to conservation of matter, matter can neither be created nor be destroyed but its state and properties can be changed. The total mass of the reactants will be equal to the total mass of the products.

Magnesium is a second group element and is a metal. Metal reacts with  hydrogen halides to form metal halides and hydrogen gas as the reaction written below:

\(Mg +2 HCl \rightarrow MgCl_{2} +H_{2}\)

The evolved hydrogen gas in this reaction tries to diffuses out the sealing and thus the balloon cover expands.  And thus the solid magnesium metal disappears to form magnesium chloride.

The evolution of gases is exothermic and therefore,  the temperature outside increases suddenly.  There we can see bubbles of hydrogen  in the reaction system.

Therefore, the changes that occur in the experiments are, rapid evolution of gases, solid metal disappears, sealing cover expands and there occur a rapid change in temperature. Thus options A,C,D,E are correct.

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Answer:

snow storm and a blizzard

Explanation:

Answer:

0.1M

Explanation:

Using Neutralisation formula,

MaVa=MbVb

>>(0.25)(40)=Mb(100)

Mb=0.1M

If the flask already has water, your measure is going to be higher than expected and MW is going to be higher too.

At first sight, we need to assume 1 atm as atmospheric pressure, probably forgot to write down this value in the Lab. By doing this, we got all values to calculate the MW.

So, for trial 1:

MW = [0.36 g x (0.082 atm x L / K x mol) x 301 K] / (1 atm x 0.125 L) = 71.08 g/mol

Trial 2:

MW = [0.38 g x (0.082 atm x L / K x mol) x 301 K] / (1 atm x 0.125 L) = 75.53 g/mol

Average MW = 73.31 g/mol

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Answer:

dont know how many

Explanation:.

Answer:

the double carbon to oxygen bond

Answer:

A.

Explanation:

C/ If Fe is greater than Fg, the negatively charged oil droplet will move freely toward the negatively charged plate.

In the Millikan oil droplet experiment, the negatively charged oil droplets are subjected to an electric field created by the charged plates. The electric force (Fe) acts on the oil droplet in a direction opposite to the gravitational force (Fg). When Fe is greater than Fg, the electric force overcomes the gravitational force, causing the negatively charged oil droplet to experience an upward force. As a result, the oil droplet moves freely upward toward the negatively charged plate.

Option B is incorrect because if Fe is equal to Fg, the forces balance each other, resulting in a stationary droplet. However, the question states that Fe is increased until it is greater than Fg, implying that the droplet is no longer stationary but moves in response to the electric force.

Therefore, option C is the correct answer, as it describes the effect of an electric field on the motion of a negatively charged oil droplet in the Millikan oil droplet experiment.

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These observational techniques and technologies enable astronomers to unravel the complex composition of stars and celestial objects, shedding light on the mysteries of the universe.

1. We know what stars are made of through the use of spectroscopy. Spectroscopy is a scientific technique that analyzes the interaction between light and matter. It allows us to study the unique fingerprint of light emitted or absorbed by different elements.

By using spectroscopy, scientists can examine the spectral lines, which are specific wavelengths of light that are either emitted or absorbed by different elements. These spectral lines provide crucial information about the chemical composition of stars and other celestial objects.

Spectroscopy extends beyond the visible range of our eyes. There are different types of spectroscopy, such as ultraviolet, infrared, and X-ray spectroscopy, which allow us to observe spectral lines that are not visible to us directly. These technologies use specialized detectors and instruments to detect and analyze these wavelengths of light, providing valuable insights into the composition of stars and other objects.

2. Our Sun is primarily composed of hot gases. Through spectroscopy, scientists have identified the specific elements present in the Sun's atmosphere. The prominent spectral lines observed in the Sun's spectrum correspond to elements such as hydrogen, helium, and trace amounts of other elements like oxygen, carbon, and iron.

The spectral lines from the Sun match with known spectral lines of these elements, confirming their presence in the Sun's composition. By studying the intensity and characteristics of these spectral lines, scientists can deduce the abundance and temperature of the different gases in the Sun.

3. Let's consider the Orion Nebula as an example of a deep space object. The composition of the Orion Nebula has been studied using a combination of technologies, including optical spectroscopy and infrared observations.

Optical spectroscopy helps to identify the presence of elements such as hydrogen, helium, oxygen, nitrogen, and other trace elements in the nebula. By analyzing the spectral lines emitted or absorbed by these elements, scientists can determine their abundance and temperature.

Infrared observations, on the other hand, allow scientists to probe the dust particles present in the nebula. By studying the infrared emission from the dust, scientists can gain insights into the chemical composition of the interstellar material and molecules present in the Orion Nebula.

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7.21 × 10^23 particles of C2H6 will be created if  7.21 × 10^23 particles of H2 react.

According to the balanced chemical equation:

C2H4 + H2 → C2H6

H2 and C2H6 have a 1:1 stoichiometric ratio, which means that for every mole of H2 that reacts, 1 mole of C2H6 is generated.

We can use the Avogadro's number (6.022 × 10^23 particles/mol) to convert the given number of particles of H2 to moles:

moles of H2 = 7.2 × 10^23 particles / 6.022 × 10^23 particles/mol

moles of H2 = 1.198 mol

Given that the stoichiometric ratio of H2 to C2H6 is 1:1, 1.198 mol of C2H6 are also created.

Now we can convert the number of moles of C2H6 to particles of C2H6 using the Avogadro's number:

particles of C2H6 = 1.198 mol × 6.022 × 10^23 particles/mol

particles of C2H6 = 7.21 × 10^23 particles

Therefore, 7.21 × 10^23 particles of C2H6 will be created if  7.21 × 10^23 particles of H2 react.

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Answer:

the force between charged particles increases when they are in solid form

This reaction involves the displacement of H from H₂PO₄ by Cr. It is an example of a redox reaction, where oxidation and reduction occur simultaneously.

The single replacement reaction between Cr and H₂PO₄ can be represented as follows:

Cr + H₂PO₄ → CrPO₄ + H₂

In this reaction, Cr is oxidized from its elemental form to Cr³+ ion, while H₂PO₄ is reduced to H₂ gas and PO₄³⁻ ions combine with Cr³+ to form CrPO₄.

To balance the reaction, we need to make sure that the number of atoms of each element is equal on both sides of the reaction. In this case, there is one Cr atom and one H₂PO₄ molecule on the left side, and one CrPO₄ molecule and one H₂ molecule on the right side. Therefore, the balanced equation is:

Cr + H₂PO₄ → CrPO₄ + H₂

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The balanced equation for this reaction is: 2Mg + \(Cl_{2}\) → \(2MgCl_{2}\).

Based on this, the classification of the reaction is (d) single replacement.

The given chemical equation is:

Mg(s) + \(Cl_{2}\)(g) → \(MgCl_{2}\)(s)

In this reaction, magnesium metal (Mg) reacts with chlorine gas (\(Cl_{2}\)) to form solid magnesium chloride (\(MgCl_{2}\)).

During the reaction, the magnesium atoms lose electrons to form magnesium ions with a +2 charge, while the chlorine molecules gain electrons to form chloride ions with a -1 charge. These ions then combine to form the ionic compound, magnesium chloride.

Based on the type of reaction, this can be classified as a synthesis reaction, where two or more substances combine to form a single, more complex substance.

Therefore, option (b) - synthesis is the correct classification for the given chemical reaction.

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The limiting reactant in the reaction 2 CO + O2 → 2 CO2, when 5.0 g of CO and 5.0 g of O2 are combined, is CO.

To determine the limiting reactant in the given reaction 2 CO + O2 → 2 CO2, with 5.0 g of CO and 5.0 g of O2, follow these steps:

1. Determine the molar mass of CO and O2:
- CO: 12.01 g/mol (C) + 16.00 g/mol (O) = 28.01 g/mol
- O2: 2 x 16.00 g/mol (O) = 32.00 g/mol

2. Calculate the moles of each reactant:
- Moles of CO = 5.0 g / 28.01 g/mol ≈ 0.178 moles
- Moles of O2 = 5.0 g / 32.00 g/mol ≈ 0.156 moles

3. Compare the mole ratio of the reactants to the stoichiometry of the balanced equation:
- For CO: 0.178 moles / 2 (from the equation) ≈ 0.089
- For O2: 0.156 moles / 1 (from the equation) ≈ 0.156

4. Determine the limiting reactant:
Since 0.089 < 0.156, CO is the limiting reactant in this reaction.

The limiting reactant in the reaction 2 CO + O2 → 2 CO2, when 5.0 g of CO and 5.0 g of O2 are combined, is CO.

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decay rate of approximately 1.69x10^17 Bq (becquerels),

The decay rate of a radioactive sample is determined by the number  of radioactive atoms present and the decay constant, which represents the probability of decay per unit of time.

To calculate the decay rate, we multiply the number of atoms in the sample by the decay constant. In this case, the sample has 8.31x10^17 atoms and a decay constant of 0.203/s. Multiplying these values gives a decay rate of approximately 1.69x10^17 Bq (becquerels), which represents the number of decays per second in the sample.

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Answer:

The net charge on the ion is negative 1(-1)

Explanation:

Negative 1(-1)

Answer:

A chemical reaction is a process where two different substances or elements are mixed together. They then undergo some sort of chemical change to become a different substance altogether.

Explanation:

In the decomposition of water, the double of hydrogen than oxygen is formed because A.) there are two atoms of hydrogen and one atom of oxygen in a water molecule.

Let's consider the balanced equation for the decomposition of water.

2 H₂O ⇒ 2 H₂ + O₂

Why is twice as much hydrogen as oxygen formed?

A.) there are two atoms of hydrogen and one atom of oxygen in a water molecule. YES. As seen in the balanced equation, due to the formula of water, the double of hydrogen is produced in comparison with oxygen.

B.) some oxygen gas escapes the reaction and hydrogen gas is conserved. NO. Both products are gases that are released.

C.) hydrogen atoms are twice the size of oxygen atoms. NO. Actually, hydrogen atoms are smaller than oxygen atoms.

D.) hydrogen gas has two atoms and oxygen gas has one atom. NO. Both gases have 2 atoms.

In the decomposition of water, the double of hydrogen than oxygen is formed because A.) there are two atoms of hydrogen and one atom of oxygen in a water molecule.

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Answer:

answer is a

Explanation:

i hope this helps you

Answer: A. There will be fewer producers in that area.

Explanation: Answer A is correct because all plants, including grass, is a producer. Since there is an increase in grass eating animals (Antelope), more grass will be consumed, decreasing the amount of grass aka producer.

Answer:

B) a substance's color and odor changed        Explanation: A signal that a chemical change has occurred is when its odor (its smell) or its appearance has changed.

The pH of a 400mL solution that was made using 2.00 grams of hydrogen trichlorate is 1.23.

The pH of a substance is a notation that describes the degree of acidity or alkalinity of the substance.

The pH of a substance can be calculated using the following expression;

pH = - log {H}

Where;

moles of hydrogen trichlorate = 2g ÷ 84.5g/mol = 0.0237 moles.

concentration = 0.0237 moles ÷ 0.4 L = 0.0592M

pH = - log {0.0592}

pH = 1.23

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Answer: An extensive property is a property that depends on the amount of matter in a sample. Mass and volume are examples of extensive properties. ... Color, temperature, and solubility are examples of intensive properties.

Explanation:

An intensive property of iron is density while an extensive property of iron is mass.

WHAT ARE INTENSIVE AND EXTENSIVE PROPERTIES?

Regarding iron as an element, one intensive property it posseses is density while one extensive property is its mass.

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The supreme court decision is: Tinker v. Des Moines Independent Community School District (1969).

The landmark Supreme Court case of Tinker v. Des Moines Independent Community School District (1969) was monumental in its decision to protect freedom of expression. This case involved several Iowa high school students, who were suspended from school for wearing armbands as a form of protest against the Vietnam War. The students took their case to court, arguing that their right to free expression was violated by the school district. The court ultimately sided with the students, ruling that “students do not shed their constitutional rights to freedom of speech or expression at the schoolhouse gate”.

This ruling was the first time that the Supreme Court had addressed the issue of student expression in public schools. The ruling established the precedent that students are protected by the First Amendment in public schools, and that school administrators must have a valid reason to restrict student speech. This ruling was also important in protecting the rights of students to express their opinions in a peaceful manner. In addition, the case highlighted the importance of individual expression and the power of students to challenge the status quo.

Which of the following supreme court decisions allows public school students to wear t-shirts protesting a school board decision that eliminates funding for high school arts programs?

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