In the reaction 2KC1(e) → 2K(s) + Cl₂(g), the K+
ions are
(1) reduced by losing electrons
(2) reduced by gaining electrons
(3) oxidized by losing electrons
(4) oxidized by gaining electrons

Explanation:

Given the equation: log x = 6

To solve it we have to:

log x = 6

10^(log x) = 10^6

x = 10^6

Answer: x = 10^6

Explanation:

It is done by only one scientist at a time.

Answer:

It uses data and observations to make conclusions

Explanation:

Scientists are very careful whilst explaining. The other guy was incorrect.

Answer:

Plants are made of gas and mass

Answer:

hello again :-)))))))

Answer:

A

Explanation:

reason:

H-F is most polar

because bond is polarized negative towards F which is the more electronegative atom.

The formula for the ionic compound formed from aluminum and selenium is Al₂Se₃.

The compound is formed by the transfer of electrons from aluminum to selenium, resulting in the formation of positively charged Al³⁺ ions and negatively charged Se²⁻ ions. The number of atoms in the resulting compound is determined by the need to balance the charges of the ions. Since aluminum has a +3 charge and selenium has a -2 charge, two aluminum atoms, and three selenium atoms combine to form Al₂Se₃.

I hope this helps! Let me know if you have any further questions.

In this question, we have the mention of a famous experiment called the Miller-Urey experiment, which as a simulation of the conditions that existed on the early Earth. Their goal was to test if the theory of origin of life based on the primordial soup hypothesis was correct. Therefore for our question the correct answer will be letter C

The properties of a natural resource that make it useful for humans as a material or energy source is the ability to convert mass into energy and vice versa.

The expression natural resources make reference to all types of matter and energy extracted from nature that can be used to produce goods and services.

Some examples of natural resources include for example irreversible resources such as fossil fuels (i.e., oil, or coal, gas, minerals such as metals, rocks, etc) as well as those based on the use of reversible energy such as eolic air energy, solar radiation or sunlight, soil and hydric resources or water.

Therefore, with this data, we can see that natural resources can be defined as any material and or energy obtained from nature that may be irreversible or reversibly used to produce goods and services.

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Answer:

38.4 mol LiOH

Explanation:

Step 1: Write the balanced neutralization equation

2 LiOH + CO₂ ⇒ Li₂CO₃ + H₂O

Step 2: Establish the appropriate molar ratio

According to the balanced equation, the molar ratio of LiOH to CO₂ is 2:1.

Step 3: Calculate how many moles of lithium hydroxide are required to react with 19.2 mol CO₂

19.2 mol CO₂ × 2 mol LiOH / 1 mol CO₂ = 38.4 mol LiOH

Answer:

you didn't show the options

Explanation:

Answer:

Approximately \(21\; \rm g\).

Explanation:

\(\rm H_2SO_4\) (a diprotic acid) reacts with \(\rm NaOH\) (a monoprotic base) at a one-to-two ratio:

\(\rm 2\; NaOH\, (s) + H_2SO_4\, (aq) \to Na_2SO_4\; (aq) + 2\; H_2O\, (l)\).

In other words, if \(n(\mathrm{NaOH})\) and \(n(\mathrm{H_2SO_4})\) represent the number of moles of the two compounds reacted, then:

\(\displaystyle \frac{n(\mathrm{H_2SO_4})}{n(\mathrm{NaOH})} = \frac{1}{2}\).

Look up the relative atomic mass data on a modern periodic table:

Calculate the (molar) formula mass of \(\rm H_2SO_4\) and \(\rm NaOH\):

\(M(\mathrm{H_2SO_4}) = 2 \times 1.008 + 32.06 + 4 \times 15.999 = 98.072\; \rm g \cdot mol^{-1}\).

\(M(\mathrm{NaOH}) = 22.990 + 15.999 + 1.008 = 39.997\; \rm g \cdot mol^{-1}\).

Calculate the number of moles of formula units in that \(33.8\; \rm g\) of \(\rm NaOH\):

\(\begin{aligned}n(\mathrm{NaOH}) &= \frac{m(\mathrm{NaOH})}{M(\mathrm{NaOH})} \\ &= \frac{33.8\; \rm g}{39.997\; \rm g \cdot mol^{-1}} \approx 0.845\; \rm mol\end{aligned}\).

Apply the ratio \(\displaystyle \frac{n(\mathrm{H_2SO_4})}{n(\mathrm{NaOH})} = \frac{1}{2}\) to find the (maximum) number of moles of \(\rm H_2SO_4\) that would react with the \(33.8\; \rm g\) of \(\rm NaOH\):

\(\begin{aligned}n(\mathrm{H_2SO_4}) &= \frac{n(\mathrm{H_2SO_4})}{n(\mathrm{NaOH})} \cdot n(\mathrm{NaOH})\\ &= \frac{1}{2} \times 0.845 \approx 0.4225\; \rm mol\end{aligned}\).

Calculate the mass of that \(0.4225\; \rm mol\) of \(\rm H_2SO_4\):

\(\begin{aligned}m(\mathrm{H_2SO_4}) &= n(\mathrm{H_2SO_4}) \cdot M(\mathrm{H_2SO_4})\\ &= 0.4225 \; \rm mol \times 98.072\; \rm g \cdot mol^{-1} \approx 41.435\; \rm g \end{aligned}\).

When the maximum amount of \(\rm H_2SO_4\) is reacted, the minimum would be in excess. Hence, the minimum mass of

\(62\; \rm g - 41.435\; \rm g \approx 21\; \rm g\) (rounded to two significant figures.)

Answer:

yes

Explanation:

because it will keep them entertained and will learn new things

Uniform circular motion is the most basic form of circular motion, in which an item moves in a circle while maintaining a constant speed.

Thus, Keep in mind that, unlike speed, the linear velocity of an object moving in a circle changes constantly since the item is always changing its direction and circular motion.

Kinematics has taught us that acceleration is a change in velocity, whether it be in speed, direction, or both. Because of this, even if the magnitude of an object moving uniformly in a circle accelerates constantly.

Every time a car rounds a corner, you personally experience this acceleration. When you make a turn while maintaining a constant speed, you are moving in a uniform circular motion.

Thus, Uniform circular motion is the most basic form of circular motion, in which an item moves in a circle while maintaining a constant speed.

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The strong base to be in equilibrium refers to shifting towards the left side of the reaction and far away from the right side i.e option 1

What do you understand by equilibrium?

A system is at an equilibrium when all of its external forces are in balance.

Generally, In any acid-base reaction, the equilibrium will favor that side of reaction which moves the proton towards the stronger base.

Let us consider the given reaction

HCl (acid)  +  NaOH (strong base)   NaCl  +  H20

As per the reaction, equilibrium will shift towards the left side as it involves the abstraction of the proton by the base.

Hence, the answer is option 1 first which means the position of equilibrium lies far to right.

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Answer:

Samarium:

Electron configuration:

Samarium

Explanation:

Samarium is a chemical element that belongs to the lanthanoid series. The lanthanoids are the chemical elements that follow lanthanum. They are all known to possess 4f orbitals. The 4f electrons are found in the antepenultimate shell of the elements of the lanthanoid series and they do not take part in chemical bonding. They are neither removed in bonding nor do they take part in crystal field stabilization of lanthanoid complexes.

The electronic configuration of samarium is; 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f6 while the condensed, short hand electronic configuration is [Xe] 4f6 6s2. This corresponds to (noble gas]ns2(n − 2) f6 as required by the question, hence the answer provided above.

Answer:

Water, H20 is a molecule made of oxygen and hydrogen. The bonds that hold water molecules together are due to shared electrons and known as Covalent bonds. In contrast, the bonds that hold NaCl molecule together are Ionic bonds, arising from charge difference between the atoms

Answer:

Here the oxidizing agent is Mg and the reducing agent is the O2.

This is because Mg is getting taking in O and is reducing itself to form MgO.

This Magnesium oxide, or magnesia, so formed is a white hygroscopic solid mineral that occurs naturally as percales and is a source of magnesium.

Explanation:

Answer:

              6.97 moles

Explanation:

Formula Used,

Moles = No. of Molecules ÷ 6.022 × 10²³

Putting Values,

Moles = 4.20 × 10²⁴ ÷ 6.022 × 10²³

Moles = 6.97 moles

Oxidizer 3-0-0-oxy is not flammable. 3-0-2 is reactive or moderately unstable. The flash point of 2-4-0 is below the ambient temperature. Health risk are there but no specific dangers are in 2-3-0 stable compound.

A nfpa diamond that is made up of 4 smaller diamonds: blue on the left with a 3 in it, red on top with a 0 in it, yellow on the right with a 0 in it, and white on the bottom with o x in it is Oxidizer 3-0-0-oxy i.e., not flammable.

A nfpa diamond that is made up of 4 smaller diamonds: blue on the left with a 3 in it, red on top with a 0 in it, yellow on the right with a 2 in it, and white on the bottom is - 3-0-2 i.e., reactive or moderately unstable.

A nfpa diamond that is made up of 4 smaller diamonds: blue on the left with a 2 in it, red on top with a 4 in it, yellow on the right with a 0 in it, and white on the bottom with c o r in it indicates that the flash point of 2-4-0 is below the ambient temperature.

A nfpa diamond that is made up of 4 smaller diamonds: blue on the left with a 2 in it, red on top with a 3 in it, yellow on the right with a 0 in it, and white on the bottom results in health risk but no specific dangers are there in 2-3-0 stable compound.

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Answer:

which property is least helpful in identifying a sample of matter is (B) VOLUME

Explanation:

volume depend on the amount of substance present and are not useful in the identification of a sample of matter. volume is an extensive property so it is not useful identifying the sample of matter.

The total amount of heat generated is 207.5 J, under the condition that the given sample possess 64.2-g sample of this substance with a specific heat of 50.6 J/(kg•°C).

The heat needed to change the temperature of a substance can be evaluated applying the given formula

q = m × c × ΔT

Here

q = energy added,

m = mass of the substance,

c = specific heat capacity of the substance

ΔT = change in temperature.

Then we can proceed by calculating the heat required to change its temperature from 180.0 °C to 244.0 °C by converting the mass of the substance from grams to kilograms

m = 64.2 g = 0.0642 kg

Then, we can evaluate the change in temperature

ΔT = (244.0 °C - 180.0 °C)

= 64.0 °C

Lastly, we can apply the formula above to evaluate the heat required

q = m × c × ΔT

= (0.0642 kg) × (50.6 J/(kg•°C)) × (64.0 °C)

= 207.5 J

Hence, 207.5 J of heat is required to change the temperature of this substance from 180.0 °C to 244.0 °C.

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Answer:

Uranium is used as fuel to heat water in a nuclear power plant. 

Answer:

low-enriched uranium fuel

When NH3 is initially added to copper sulfate solutions, a precipitate of copper(II) hydroxide will form.

Copper is a reddish-brown, malleable metal that is used in many fields, from electrical wiring to jewelry making. It is the 29th element on the periodic table, and is known to be the best conductor of electricity, which makes it an important component of electronics. Copper has been used since ancient times due to its availability, malleability and high melting temperature. Its uses range from coins and jewelry to plumbing and electrical wiring.

This is because copper sulfate is an insoluble salt and NH3 is a strong base. The reaction between the two substances results in the formation of copper(II) hydroxide, which is an insoluble salt. This forms a precipitate and can be observed as an indication of the reaction taking place.

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You have 100 mL of a 12 M solution of HCl, and you need to dilute it to 1.5 M for an experiment. How many liters will your new solution be?

When working with dilutions we usually use this formula:

Vi * Mi = Vf * Mf

Where, Vi and Mi are the initial volume and the initial molar concentration (before the dilution) and Vf and Mf are the final volume and final molar concentration (after the dilution)

The concentration before the dilution is 12 M and the volume of solution that we have is 100 mL.

Vi = 100 mL

Mi = 12 M

We want to prepare a 1.5 M solution and want to know the volume.

Vf = ?

Mf = 1.5 M

We can replace these values in the formula and solve it for Vf to get the final volume.

Vi * Mi = Vf * Mf

Vf = Vi * Mi/Mf

Vf = 100 mL * 12 M/(1.5 M)

Vf = 800 mL

But we need the answer in L. We know that there are 1000 mL in 1 L.

1000 mL = 1 L

Vf = 800 mL = 800 mL * 1 L/(1000 mL)

Vf = 0.800 L

Answer: The new solution will have a volume of 0.800 L.

Answer:

will be 9.7 Liters

Explanation:

In those portions, the heat supplied to the substance by the heater does not lead to a temperature rise as intermolecular forces are broken.

When a substance is heated, we normally expect that its temperature will rise as a consequence.

However, heat may be supplied to a substance but its temperature does not rise owing to the fact that the heat energy supplied is used to break intermolecular bonds.

This occurs during fusion and boiling. The heat supplied at these point does not result in temperature rise since it is used to break intermolecular bonds. The temperature remains steady during these processes as shown by the two flat portions on the graph in the image attached to the question. This heat supplied is known as the latent heat.

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Answer:

The answer for me was "These show where changes of state are occuring"

Explanation:

I got it right

The correct statement about cytokinesis is that a cell plate forms in plant cells. Option C is correct.

During cytokinesis, the cytoplasm of the parent cell divides into two daughter cells, each with its own nucleus and organelles. In animal cells, a contractile ring made of actin and myosin filaments forms around the cell's equator and contracts, pinching the cell in two.

In contrast, plant cells build a cell plate, which forms from vesicles produced by the Golgi apparatus, at the cell's equator. These vesicles fuse together and form a new cell wall to separate the two daughter cells. The other three options mentioned in the question are related to mitosis, which is the division of the nucleus, whereas cytokinesis is the division of the cytoplasm. Option C is correct.

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