Round the value 44.981 g to three significant figures.

Answer:

The waters' temp increased

Explanation:

The temperature of the water in the swimming pool has increased due to the heat from the Sun. As a result, the particles in the water are moving faster and have a higher kinetic energy than in the morning.

The statement 'the pKa is the pH at which a weak acid’s protons are 50% titrated' is true as weak acids do not have the ability to get completely ionized.

The statement is true because weak acids do not completely ionize in solution, so at a certain pH, half of the acid’s protons will be titrated.

This is known as the acid’s dissociation constant, which is a measure of the acid’s ionization in solution. The pKa is the pH at which the acid’s dissociation constant is equal to one.

The lower the pKa, the more acidic the solution will be. A weak acid with a pKa of 2 will be more acidic than one with a pKa of 5.

Therefore, the statement 'the pKa is the pH at which a weak acid’s protons are 50% titrated' is true.

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Explanation:

kinetic energy = ½mv²

1800 = ½ × m × 11.2²

1800 = ½ × m × 125.44

3600 = 125.44m

m = 3600/125.44

m = 28.7 Kg

The equilibrium constant (Kc) for the given reaction is approximately 16.448. The value of Kc indicates the relative concentrations of reactants and products at equilibrium. In this case, a Kc greater than 1 suggests that the products (H2 and P4) are favored at equilibrium, indicating that the forward reaction is more favorable.

To determine the equilibrium constant (Kc) for the given reaction:

4PH3(g) ↔ 6H2(g) + P4(g)

We can write the equilibrium constant expression based on the stoichiometric coefficients:

Kc = ([H2]^6 * [P4]) / ([PH3]^4)

Substituting the given equilibrium concentrations:

[PH3] = 0.250 M

[H2] = 0.580 M

[P4] = 0.750 M

We can plug in these values into the equilibrium constant expression:

Kc = ([0.580]^6 * [0.750]) / ([0.250]^4)

Kc = (0.0860128 * 0.750) / (0.00390625)

Kc = 16.448

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A scientist goes to lab to synthesize Na₃AlF₆ via the balanced chemical reaction. If they need 780. grams of Na₃AlF₆, and the overall percent yield is 45.4 %,311.79 g of Al₂O₃ is required to form 780 grams of Na₃AlF₆.

The balanced chemical reaction is defined as the mass of total number of product is exactly equal to the total number of mass of reactant.

Given:

45.4% yield = 780 g

Then 100% yield would be =780 × (100/45.4)

= 1718 g

Molar mass of Na₃AlF₆ = 209.94 g/mol

Molar mass of Al₂O₃ = 101.96 g/mol

1mole of Al₂O₃ gives 2 moles of Na₃AlF₆ .

⇾ 101.96 g of Al2O3 gives 2 × 209.94 g of Na3AlF6

Therefore, x g of Al2O3 gives 1284 g of Na3AlF6

x = (1718 × 101.96)/ 2 × 209.94

= 311.79 g

Thus, 311.79 g of Al₂O₃ is required to form 780 grams of Na₃AlF₆.

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The percent composition of oxygen in beryllium nitrate, Be(NO3)2 is  72.166%.

Percent composition is very straightforward. Percent composition indicates the percentage of each element in a compound by mass. A chemical compound is made up of two or more elements.

Percent composition is important because it allows us to calculate the percentage of each element in a compound. Here, the quantity is measured in terms of grams of the elements present.

For example, if we know the mass and chemical composition of a substance, we can find out the number of moles and calculate the number of atoms or molecules in the sample.

In  Be(NO3)2 the percent composition of Beryllium (Be) is 6.775%, Nitrogenium (N) is 21.060% and Oxygenium (O) is72.166%.

Thus, The percent composition of oxygen in beryllium nitrate, Be(NO3)2 is 72.166%.

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The balanced equation is: 4 \(H_2S\)+ 3 \(O_2\)→ 4 \(SO_2\)+ 8 \(H_2O\)

The given chemical equation is unbalanced. To balance it, we need to adjust the coefficients in front of each chemical species until the number of atoms on both sides of the equation is equal.

The unbalanced equation is:

2 \(H_2S\)+ 3 \(O_2\)→ \(SO_2\)

Let's start by balancing the sulfur (S) atoms. We have two sulfur atoms on the left side and one sulfur atom on the right side. To balance the sulfur, we can place a coefficient of 2 in front of the \(SO_2\):

2 \(H_2S\)+ 3 \(O_2\)→ 2 \(SO_2\)

Now, let's balance the hydrogen (H) atoms. We have four hydrogen atoms on the left side (2 from each \(H_2S\)) and none on the right side. To balance the hydrogen, we can place a coefficient of 4 in front of the water (H2O) on the right side:

2 \(H_2S\)+ 3 \(O_2\)→ 2 \(SO_2\)+ 4 \(H_2O\)

Finally, let's balance the oxygen (O) atoms. We have six oxygen atoms on the right side (3 from \(O_2\) and 3 from 2 \(SO_2\)) and three on the left side (2 from \(H_2S\)). To balance the oxygen, we can place a coefficient of 3/2 in front of the O2:

2 \(H_2S\)+ (3/2) \(O_2\)→ 2 \(SO_2\)+ 4 \(H_2O\)

To remove the fractional coefficient, we can multiply all coefficients by 2:

4 \(H_2S\) + 3 \(O_2\)→ 4 \(SO_2\)+ 8 \(H_2O\)

Now the equation is balanced, with an equal number of atoms on both sides. The balanced equation is:

4 \(H_2S\)+ 3 \(O_2\)→ 4 \(SO_2\)+ 8 \(H_2O\)

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Answer:

HOCl is the preferred arrangement.

Explanation:

Hypochlorous acid (HOCl or HClO) is a weak acid that contains Hydrogen, Chlorine and oxygen. Generally both are accurate molecular formulars as hey show the exact number of atoms of elements present in the compound.

However the preferred formular is HOCl. The reason for this is because HOCl implies the molecular structure (that is, how the atoms are bonded to each other). The H is bonded to the O and the O in turn is being bonded to the Cl. HClO on the other hand says nothing about the molecular structure.

Answer:

17.5 L

Explanation:

Step 1: Given data

Step 2: Calculate the final volume of the nitrogen

We have a gas that undergoes a change at a constant temperature. If we assume an ideal behavior, we can calculate the final volume of the nitrogen using  Boyle's law.

P₁ × V₁ = P₂ × V₂

V₂ = P₁ × V₁/P₂

V₂ = 1 atm × 14.0 L/0.8 atm = 17.5 L

Answer:

The human cheek cell is a good example of a typical animal cell. It has a prominent nucleus and a flexible cell membrane which gives the cell its irregular, soft-looking shape.

Answer:

I think it's A. I'm pretty sure.

Explanation:

Answer:

Coal, oil and natural gas are called _________A. fossil fuels

There is no reaction between zinc II sulfate and magnesium sulfate.

We know that a reaction is said to occur when two species are combined and there are new products that appear in the system. This implies that if there are no new substances that appear in the system we can not say that a chemical reaction has taken place.

In this case, we can see that we can not be able to observe any change when wee mix a solution of magnesium sulfate and zinc II sulfate since the both of them have the same anion.

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An error during DNA replication would create a gene mutation.

During DNA replication, the genetic information in a cell is copied to make new DNA molecules. However, mistakes can occur during this process, leading to changes in the DNA sequence, which can result in a mutation. Mutations can also be caused by exposure to environmental factors, such as radiation or chemicals, which can damage the DNA molecule directly or affect the cellular processes involved in DNA replication.

Mutations can have a variety of effects on the organism, ranging from no effect to causing serious health problems or even death. Gene mutations can also be inherited from a parent, which can result in genetic disorders or predisposition to certain diseases. Therefore, it is important to understand the mechanisms of gene mutations and their potential impacts on organisms.

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Answer:

Answer Below ↓

Explanation:

If the moving sand hits an obstacle, it stops due to the friction created by the contact and its kinetic energy is then transformed into thermal energy, or heat.

In order to prepare the solution required by this question, we would employ the use of 375mg of protein.

Here we are given the ratio of protein to solution that we wish to achieve. Said ratio is 15mg/ml. This means that there should be 15mg of protein for every ml of solution. Since we have 25ml of the solution, we can multiply these values to reach our answer of 375mg of protein.

Therefore, we can confirm that In order to prepare the solution required by this question, we would employ the use of 375mg of protein.

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Biotechnology is the use of living organisms or other biological systems in the manufacture of drugs or other products or for environmental management, as in waste recycling: includes the use of bioreactors in manufacturing, microorganisms to degrade oil slicks or organic waste, genetically engineered bacteria to produce human hormones, and monoclonal antibodies to identify antigens.

Biotech offers the possibility of improving human health, the environment, and agriculture while creating more sustainable modes of production.

Answer:

0.9718M

Explanation:

Rate constant, k =  0.255 M-1s-1

time, t = 8.00 s

Initial concentration, [A]o = 1.33 M

Final concentration, [A] = ?

These quantities are represented by the equation;

1 / [A] = 1 / [A]o + kt

1 / [A] = 1 /1.33 + (0.255 * 8)

1 / [A] = 0.7519 + 2.04

[A] = 1 / 2.7919 = 0.3582 M

How much of NO2 decomposed is obtained from the change in concentration;

Change in concentration = Initial - Final

Change = 1.33 - 0.3582 = 0.9718M

Answer:

Explanation:

19.9% = 19.9/100 = 0.199

80.1% = 80.1/100 = 0.801

0.199 * 10.0129371 =     1.992574483

0.801 * 11.0093055 =  8.818453706

Mass =                          10.81102819

This should be rounded to six places after the decimal. 10.811028 if the given amu's are used.

If the %s are used, then 10.811 is the best answer.

The volume in liters of a 2.0 M solution of NaOH that can be made using 500.0 g NaOH is 6.25 liters.

The molarity of a solution is the concentration of a solution expressed in moles of solute per given liter of solution.

The molarity of a solution is given mathematically as follows:

The volume in liters of a 2.0 M solution of NaOH that can be made using 500.0 g NaOH is calculated below:

Moles of solute = mass/molar mass

Moles of NaOH = 500 / 39.997

Moles of NaOH = 12.5 moles

Volume of solution = 12.5 / 2.0

Vlume of solution = 6.25 liters

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Answer:

86

Explanation:

The reaction that takes place is:

First we convert moles of ethanol to moles of water:

Then we convert moles of water to grams of water, using its molar mass:

So 84.6 grams of water will be produced.

The mass of water, H₂O produced when 1.6 moles of ethanol, C₂H₅OH are completely burned is 86.4 g

We'll begin by writing the balanced equation for the reaction. This is given below

C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O

From the balanced equation above,

1 mole of C₂H₅OH reacted to produce 3 moles of H₂O.

From the balanced equation above,

1 mole of C₂H₅OH reacted to produce 3 moles of H₂O.

Therefore,

1.6 moles of C₂H₅OH will react to produce = 1.6 × 3 = 4.8 moles of H₂O.

Mole of H₂O = 4.8 moles

Molar mass of H₂O = (2×1) + 16 = 18 g/mol

Mass = mole × molar mass

Mass of H₂O = 4.8 × 18

Thus, the mass of water obtained from the reaction is 86.4 g

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The mass of the asteroid is C. 1.2 x \(10^{12}\) Kg

To find the mass of the other asteroid, we can rearrange the equation for the gravitational force between two objects:

F = (G * m1 * m2) / \(r^{2}\)

where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two asteroids, and r is the distance between them.

Given that the distance between the asteroids is 75000 m, the force of gravity between them is 1.14 N, and one asteroid has a mass of 8 x \(10^{7}\) kg, we can substitute these values into the equation and solve for the mass of the other asteroid (m2):

1.14 N = (6.67430 × \(10^{-11}\) N \(m^{2}\)/\(Kg^{2}\) * 8 x \(10^{7}\) kg * \(m2\)) / \((75000 m)^{2}\)

Simplifying and solving the equation, we find that the mass of the other asteroid (m2) is approximately 1.2 x \(10^{12}\) kg. Therefore, Option C is correct.

The question was incomplete. find the full content below:

Two asteroids are 75000 m apart one has a mass of 8 x \(10^{7}\) kg if the force of gravity between them is 1.14 what is the mass of the asteroid

A. 3.4 x \(10^{11}\) kg

B. 8.3 x \(10^{12}\) kg

C. 1.2 x \(10^{12}\) kg

D. 1.2 x \(10^{10}\) kg

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Answer: A

Explanation:

As one increases the other goes in a straight line.  It is called a direct proportionality.  Forms a linear graph.

Answer:

Explanation:

Smoking a cigarette, snorting cocaine, or drinking yourself into oblivion are all easy habits to adopt because they light up your brain with the neurotransmitter …

Answer: A balanced chemical equation, including physical state symbols, for the decomposition of solid sodium azide (\(NaN_{3}\)) into solid sodium and gaseous dinitrogen is \(2NaN_{3}(s) \rightarrow 2Na(s) + 3N_{2}(g)\).

Explanation:

A chemical equation which contains same number of atoms on both reactant and product side is called a balanced chemical equation.

For example, \(NaN_{3}(s) \rightarrow Na(s) + N_{2}(g)\)

Here, number of atoms present on reactant side are as follows.

Number of atoms present on product side are as follows.

To balance this equation, multiply \(NaN_{3}\) by 2 on reactant side. Also, multiply Na by 2 and \(N_{2}\) by 3 on product side.

The equation will be rewritten as follows.

\(2NaN_{3}(s) \rightarrow 2Na(s) + 3N_{2}(g)\)

This equation contains same number of atoms on both reactant and product side. Hence, this equation is now balanced.

The symbols (s) and (g) depicts the physical state of substances present in the equation as solid and gas.

Thus, we can conclude that balanced chemical equation, including physical state symbols, for the decomposition of solid sodium azide (\(NaN_{3}\)) into solid sodium and gaseous dinitrogen is \(2NaN_{3}(s) \rightarrow 2Na(s) + 3N_{2}(g)\).

Answer:

\(r_{Br_2}=2.1x10^{-4}M/s\)

Explanation:

Hello,

In this case, for the reaction:

\(5Br^-(aq)+BrO_3^-(aq)+6H^+(aq)\rightarrow 3Br_2(aq)+3H_2O(l)\)

Thus, via the rate proportions between Br⁻ and Br₂ for which the stoichiometric coefficients are 5 and 3 respectively, we can write:

\(\frac{r_{Br^-}}{-5} =\frac{r_{Br_2}}{3}\)

Hence, the rate of appearance of Br₂ turns out:

\(r_{Br_2}=\frac{3r_{Br^-}}{-5}=\frac{3*-3.5x10^{-4}M/s}{-5}\\ \\r_{Br_2}=2.1x10^{-4}M/s\)

Take into account that the rate of disappearance is negative for reactants.

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Over-tilling and Over farming are the two processes that can harm the fertility of the soil.

Over-tilling refers to the exceeding levels of tilling and levelling the soil which adversely affects the quality of the soil. This is because tillage fractures the soil, it disrupts soil structure, accelerating surface runoff and soil erosion. Tilling of soil also reduces crop residue, which help cushion the force of pounding raindrops.

Without crop residue, soil particles become more easily dislodged, being moved or 'splashed' away. The splashed particles clog soil pores, effectively sealing off the soil's surface, resulting in poor water infiltration and hence subsequently affects the soil fertility.

Similarly, the main effect of over-farming is soil depletion. When crops are grown in the same place year after year, the soil becomes depleted of the nutrients that the plants need to grow. This can lead to lower yields and poorer quality crops. In extreme cases, it can lead to desertification.

So, these two are the processes that can harm soil fertility.

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Observation and questioning are the two initial steps of the scientific method, and they are closely connected. Observation refers to gathering information and data about a natural phenomenon or a specific problem, while questioning refers to developing an inquiry about what has been observed.

In other words, observation leads to questioning because as scientists observe something, they notice patterns, relationships, and discrepancies that raise questions about what is happening and why. These questions then serve as a guide for further investigation and experimentation, leading to the development of hypotheses and theories.

Furthermore, the quality of the observation directly influences the type of questions that can be formulated. A more precise and accurate observation will lead to more focused and specific questions, while vague observations can lead to ambiguous and unclear questions.

In summary, the observation and questioning steps of the scientific method are interconnected and essential for the development of scientific knowledge. Accurate and detailed observations lead to well-formulated questions that guide scientific inquiry and experimentation, leading to the development of hypotheses and theories.

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In the scientific method, the Observation phase leads to careful observations about a trend, pattern, or phenomenon, which then sparks curiosity in the Question phase. The connection is that observations help formulate specific, research-oriented questions, which then guide the next steps of the scientific investigation.

The Observation and Question steps are crucial phases in the scientific method, being interconnected in meaningful ways. In the Observation phase, a scientist makes careful, detail-oriented observations about the world or specifically focused aspect(s). These observations could be about a trend, a pattern, or any interesting phenomenon.

These observations lead to the Question step. After identifying a particular trend or pattern during the Observations step, a scientist becomes curious and asks a question about why or how something happens. It's through these observations that scientists come up with specific, research-oriented questions, setting the stage for the formulation of a hypothesis and further experimentation. In other words, the questions that drive the scientific investigation are based on initial observations. So, we can say the connection between the Observation and Question steps of the scientific method is that observations spark curiosity and lead to questions, while questions in turn guide the future research direction.

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