When finding the mean, or average, of a set of numbers you divide the sum of the
group of numbers by the number of items in the group.
What is the average height for the 3 trials listed below?
6 cm
4 cm
2 cm
12 cm
6 cm
2 cm
4 cm

The van't Hoff factor is a measure of the effect of a solute on the freezing point of a solvent, and it depends on the concentration of the solute and the nature of the solvent.

In order to determine the van't Hoff factor for a deicer in water, we would need to know the concentration of the deicer in each of the six solutions that were prepared, as well as the freezing point of each solution.

Assuming that the deicer is a solute that is dissolved in water, the van't Hoff factor for the deicer can be calculated using the following formula:

ΔTf = ΔTb - (Kf * x)

here ΔTf is the change in freezing point, ΔTb is the change in freezing point of the solvent, Kf is the freezing point depression constant for the solvent, and x is the concentration of the solute in moles per liter.

The freezing point depression constant for water is 1. 86 °C/m, and the freezing point of water is 0 °C. Therefore, the freezing point of a solution of water with a concentration of x moles per liter is (1 + x) °C.

To calculate the van't Hoff factor for the deicer, we need to know the concentration of the deicer in each of the six solutions that were prepared. Without this information, it is not possible to determine the van't Hoff factor for the deicer.  

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Answer:

C

Explanation:

view the Attached photo i added to see how i got that answer

Answer:

Please find the definition and example of neutralization reaction below

Explanation:

In chemistry, neutralization reaction is a type of reaction involving a base and an acid to form salt and water. In other words, when an acid and a base comes together chemically to form a salt and water, a neutralization reaction is said to occur.

For example; in a reaction between sodium hydroxide (NaOH) and hydrogen chloride (HCl) as follows:

HCl(aq) + NaOH(aq) → NaCl(s) + H2O(l)

In this neutralization reaction, the HCk is the acid while the NaOH is the base (reactants). For the products, the NaCl is the salt while H2O is water.

The valence electrons in a compound are seen in the resonance structure.

The number of valence electrons in a compound is represented by the Lewis structure of the chemical. The bonding in a molecule cannot always be explained by a single Lewis structure.

The diagrams known as Lewis structures, often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present.

The octet rule, which states that atoms share electrons so that each has eight in its outer shell, is the foundation of a Lewis structure. For instance, the outer shell of an oxygen atom has six electrons.

German chemist Hans von Pechmann developed diazomethane in 1894, which is the chemical molecule CH2N2. The simplest diazo compound is this one. Since it is an explosive yellow gas in its pure state at ambient temperature, it is virtually often utilized as a solution in diethyl ether.

The carbon and nitrogen atoms in the molecule each have two double bonds and two single bonds. The Valence Shell Electron Pair Repulsion (VSEPR) theory is used to study the compound's molecular structure.

Resonance structures are a class of contributing structures that are used in certain circumstances. The graphic that is linked to this answer displays the resonance structures of diazomethane along with the formal charges on each atom.

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Explanation:

Two main ways, free elections, casting your vote for the candidate supporting your goals. Second, Lobbying the sitting gov.

The flaw in Regina’s plan is that the time frame is unrealistic (option B).

Goal setting involves the development of an action plan designed in order to motivate and guide a person or group toward a goal, which is a result that one is attempting to achieve.

Effective goal setting lets you measure progress, overcome procrastination and visualize your dreams. However, setting goals is said to be effective when it is done in an adequate time frame.

According to this question, Regina identifies her goal and hastily writes it down as follows: I will make an A on my English literature term paper that is due next week.

This goal, although is great, is unlikely to be met because of the time frame. One cannot get an excellent result in something that lacks adequate preparation, which includes adequate time.

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The addition of hydrogen carbonate to bromothymol blue turns the solution blue. Thus, option B is correct.

The balanced equation for the dissociation of bromothymol blue is:

\(\rm HC_2H_3O_2\;\leftrightharpoons H^+\;+\;C_2H_3O_2^-\)

The color of dissociated form is yellow and undissociated form is blue.

The addition of hydrogen carbonate results in the dissociated ions as:

\(\rm H_2CO_3\;\rightarrow\;2\;H^+\;+\;CO_3^-\)

The dissociation results in the increased hydrogen ion concentration. The undissociated form in the reaction mixture increases.

Thus, the color of the solution will turn blue. Hence, option B is correct.

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Answer:

A. The solution will remain yellow.

Explanation:

Correct on Edge 2022!!!

Good luck everyone, you got this! Have a great day!

Answer:

What is D. oxygen

I hope it helps.    ; )

Brainly, thank you or rating are always welcomed and appreciated.

Explanation:

Answer:

when you multpily or divide powers of 10 you just add or subratact respectivley

Explanation:

(5.93 x 10 ^ 3) (2.3 x 10^ -2) = (5.93 * 2.3 ) x 10 ^ 3 +(-2)

                                             = 13.639 x 10 ^ 3-2

                                             = 13 . 639 x 10

                                              1.3639 x 10^2

The electricity generated that powers the watch by zinc in the battery combines with oxygen in the air, zinc oxide forms reaction is a product.

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Answer:

That's kind of a weird question. A lot though.

Explanation:

lot

goofy ahhAnswer:

a

Explanation:

Answer:  the number of grams of AgNO3 present in its 7.4 moles is 1257.

Date: September 11, 2020

Source: Arizona State University

Summary: Astronomers have determined that some carbon-rich exoplanets, given the right circumstances, could be made of diamonds and silica.

As missions like NASA's Hubble Space Telescope, TESS and Kepler continue to provide insights into the properties of exoplanets (planets around other stars), scientists are increasingly able to piece together what these planets look like, what they are made of, and if they could be habitable or even inhabited.

In a new study published recently in The Planetary Science Journal, a team of researchers from Arizona State University (ASU) and the University of Chicago have determined that some carbon-rich exoplanets, given the right circumstances, could be made of diamonds and silica.

"These exoplanets are unlike anything in our solar system," says lead author Harrison Allen-Sutter of ASU's School of Earth and Space Exploration.

Diamond exoplanet formation

When stars and planets are formed, they do so from the same cloud of gas, so their bulk compositions are similar. A star with a lower carbon to oxygen ratio will have planets like Earth, comprised of silicates and oxides with a very small diamond content (Earth's diamond content is about 0.001%).

But exoplanets around stars with a higher carbon to oxygen ratio than our sun are more likely to be carbon-rich. Allen-Sutter and co-authors Emily Garhart, Kurt Leinenweber and Dan Shim of ASU, with Vitali Prakapenka and Eran Greenberg of the University of Chicago, hypothesized that these carbon-rich exoplanets could convert to diamond and silicate, if water (which is abundant in the universe) were present, creating a diamond-rich composition.

To test this hypothesis, the research team needed to mimic the interior of carbide exoplanets using high heat and high pressure. To do so, they used high pressure diamond-anvil cells at co-author Shim's Lab for Earth and Planetary Materials.

First, they immersed silicon carbide in water and compressed the sample between diamonds to a very high pressure. Then, to monitor the reaction between silicon carbide and water, they conducted laser heating at the Argonne National Laboratory in Illinois, taking X-ray measurements while the laser heated the sample at high pressures.

As they predicted, with high heat and pressure, the silicon carbide reacted with water and turned into diamonds and silica.

So far, we have not found life on other planets, but the search continues. Planetary scientists and astrobiologists are using sophisticated instruments in space and on Earth to find planets with the right properties and the right location around their stars where life could exist.

For carbon-rich planets that are the focus of this study, however, they likely do not have the properties needed for life.

While Earth is geologically active (an indicator habitability), the results of this study show that carbon-rich planets are too hard to be geologically active and this lack of geologic activity may make atmospheric composition uninhabitable. Atmospheres are critical for life as it provides us with air to breathe, protection from the harsh environment of space, and even pressure to allow for liquid water.

"Regardless of habitability, this is one additional step in helping us understand and characterize our ever- increasing and improving observations of exoplanets," says Allen-Sutter. "The more we learn, the better we'll be able to interpret new data from upcoming future missions like the James Webb Space Telescope and the Nancy Grace Roman Space Telescope to understand the worlds beyond on our own solar system."

Answer:

a force is push or pull that act on object as a result of object interaction its surrounding.

Explanation:

The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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Answer:

true

Explanation:

Answer:

The equation for molarity is moles/liter for the first question you would do 0.256/0.143 liters to get 1.790 mol/L

Explanation:

The second problem you would do need to find the moles of NaCl which you would do by doing 4.89 g/58.44g/mol= 0.08367 then do 0.08367/0.600= 0.139 mol/L

The third problem would be the same steps as the second one.

The fourth problem would be (0.460M)(5.50L)= 2.53 moles

The molarity of a solution which contains 0.256 mol of a substance dissolved in 143 mL of solution is 1.79.

Molarity of a given solution is known as the total number of moles of solute per litre of the solution.  A solution that is 1.00 molar (written 1.00 M) contains 1.00 mole of solute for every liter of solution.

Molarity = (No. of moles of solute ÷ Volume of solution in liters)

The unit of molarity is mol L⁻¹.

Molarity is temperature dependent because as temperature changes, volume of the solution also changes.

Given,

No. of moles = 0.256

Volume of solution = 143ml

Molarity = (0.256 ÷ 0.143) = 1.79

Therefore, The molarity of a solution which contains 0.256 mol of a substance dissolved in 143 mL of solution is 1.79.

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The products formed are KCH3COO (potassium acetate) and AgNO3 (silver nitrate). Silver nitrate is known to be slightly soluble in water, so it will form a precipitate (solid) when the reaction occurs. Therefore, the correct answer is:
b. Precipitate (solid).

The reaction between KNO3 (potassium nitrate) and AgCH3COO (potassium nitrate) is a double displacement reaction. In a double displacement reaction, the cations and anions of the two compounds switch places to form two new compounds. In this case, the reaction can be written as:
KNO3 (aq) + AgCH3COO (aq) → KCH3COO (aq) + AgNO3 (s)

The products formed are KCH3COO (potassium acetate) and AgNO3 (silver nitrate). Silver nitrate is known to be slightly soluble in water, so it will form a precipitate (solid) when the reaction occurs. Precipitate (solid)
To summarize, the reaction between KNO3 and AgCH3COO results in the formation of a solid precipitate (AgNO3). This is due to the double displacement reaction that takes place, causing the cations and anions to switch places and create new compounds. The observed outcome indicates the formation of a solid product, making option b the accurate response.

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In a dihybrid cross, we are examining two traits simultaneously.

The parental organisms are homozygous for both traits and are crossed to produce offspring that are heterozygous for both traits. For example, in a cross between two pea plants, one that is homozygous for yellow seeds and round shape (YYRR) and the other homozygous for green seeds and wrinkled shape (yyrr), the F1 generation will be heterozygous for both traits (YyRr).

The dihybrid cross involves examining the inheritance patterns of both traits simultaneously in the F2 generation. The phenotypic ratio of the F2 generation in a dihybrid cross is 9:3:3:1, which means that 4 different combinations of the two traits are possible in the offspring.

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Answer:

Please make me brainalist and keep smiling dude I hope you will be satisfied with my answer is updated

Explanation:

Down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital. This results in a larger atomic radius.

During electrolysis a metal chemically decompose and deposits on the cathode where as the metal from the other electrode forms its ions in the electrolyte solution.

Electrolysis is the process of chemical decomposition brought out by the passage of electricity through an electrolyte in which the decomposed metal deposits on one electrode.

Electrolysis involves oxidation of one metal and reduction of the other. The prediction of the products of electrolysis requires a consideration of several factors including the potential at which the competing species are discharged at the electrode , if the electrode used are reacted or inert etc.

The oxidation reaction involves the formation of cations in the solution and the reduction involves the deposition of metallic substance at the cathode.

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The molar solubility of calcium carbonate (CaCO3) in water can be calculated using the solubility-product constant (Ksp) for CaCO3, which is 4.5 × 10-9 at 25°C. The equation for the dissolution of CaCO3 is:

CaCO3(s) ⇌ Ca2+(aq) + CO32-(aq)
At equilibrium, the product of the concentrations of the dissolved ions (Ca2+ and CO32-) is equal to the Ksp value. Let's assume the molar solubility of CaCO3 is x. Then, the concentrations of Ca2+ and CO32- are also equal to x.
So, Ksp = [Ca2+][CO32-] = x * x = x^2
Therefore, x = sqrt(Ksp) = sqrt(4.5 × 10-9) = 6.7 × 10-5 M
Thus, the molar solubility of CaCO3 in water at 25°C is 6.7 × 10-5 M. This means that at equilibrium, the concentration of Ca2+ and CO32- ions in solution is 6.7 × 10-5 M. If more CaCO3 is added to the solution, it will not dissolve because the solution is already saturated with Ca2+ and CO32- ions. Conversely, if the concentration of Ca2+ or CO32- ions is increased (by adding a soluble salt of one of these ions, for example), more CaCO3 will dissolve until the equilibrium concentration is re-established.the concentration of Ca^2+ is x, and the concentration of CO3^2- is also x. The Ksp expression is: Ksp = [Ca^2+] [CO3^2-] Substituting the values, we have: 4.5 × 10^-9 = x^2 Now, solve for x: x = √(4.5 × 10^-9) ≈ 6.7 × 10^-5 M The molar solubility of calcium carbonate (CaCO3) in water at 25°C is approximately 6.7 × 10^-5 M.

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As a result, gas's molecular weight is 44g/mol. It is the gas's (Carbon dioxide) molecular weight.

What is Molecular Weight?

The total atomic weights of the atoms in a molecule are measured by its molecular weight. To calculate stoichiometry in chemical equations and reactions, chemists employ molecular weight. M.W. or MW are two frequent abbreviations for molecular weight. Atomic mass units (amu), Daltons, or a unitless expression can be used to indicate molecular weight (Da).

The mass of the isotope carbon-12, which is given a value of 12 amu, serves as the reference point for defining both atomic weight and molecular weight. Because there are many carbon isotopes, the atomic weight of carbon is not exactly 12.

A mole of any gas at STP takes up a volume of 22.4l

at STP, a gas fills a volume of 2.24l

Calculating the quantity of moles of gas in step two

Consequently, the amount of gas in moles

= 0.1 moles

This is equivalent to carbon dioxide's molecular weight.

=44g/mol

As a result, gas's molecular weight is 44g/mol. It is the gas's (Carbon dioxide) molecular weight.

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4. Change in temperature (｡^‿^｡)

answer

When an electron temporarily occupies an energy state greater than its ground state, it is in an excited state. An electron can become excited if it is given extra energy, such as if it absorbs a photon, or packet of light, or collides with a nearby atom or particle

Answer:

Na

Explanation:

there is an periodic trend:

increases going down and increases going to the left

When 50 NBr3 molecules and 57 NaOH formula units react according to the given balanced equation, the result is the formation of 150 NaBr formula units.

According to the balanced equation provided:

2 NBr3 + 3 NaOH -> N2 + 3 NaBr + 3 HOBr

From the equation, we can see that 2 moles of NBr3 react with 3 moles of NaOH to form 3 moles of NaBr.

To determine the number of NaBr formula units formed, we need to convert the given quantities into moles.

Given:

Number of NBr3 molecules = 50

Number of NaOH formula units = 57

To convert the number of NBr3 molecules to moles, we need to divide the given quantity by Avogadro's number. Similarly, for NaOH formula units, we can directly consider them as moles.

Using Avogadro's number (6.022 x 10^23 molecules/mol), we can calculate the number of moles for NBr3 and NaOH:

Number of moles of NBr3 = 50 / (6.022 x 10^23)

Number of moles of NaOH = 57

Now, we can use the mole ratios from the balanced equation to determine the number of moles of NaBr formed. From the equation, we know that 2 moles of NBr3 react to form 3 moles of NaBr.

Number of moles of NaBr = (Number of moles of NBr3) x (3 moles of NaBr / 2 moles of NBr3)

Finally, we can convert the number of moles of NaBr to the number of NaBr formula units using Avogadro's number:

Number of NaBr formula units = (Number of moles of NaBr) x Avogadro's number

Calculating these values, we find that 50 NBr3 molecules and 57 NaOH formula units react to form 150 NaBr formula units.

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Various samples of the must be combusted in other to obtain a reliable result.

The bomb calorimeter is used to obtain the energy of a sample. This is called the energy equivalent or the energy value of the sample.

Now, we know that the bomb calorimeter is calibrated by the use of benzoic acid hence it must be combusted first to obtain the basic energy value of the calorimeter.

Various samples of the must be combusted in other to obtain a reliable result.

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Explanation:

Sometimes it is necessary to put forth new theories to explain experimental results, Explanation:

Creativity is important to science because sometimes, it is necessary to put forth new theories to explain experimental results. Theories are explanation of scientific observations.

Answer: Without creativity, it would be difficult to come up with new methods to answer scientific questions, meaning we likely wouldn't learn anything new.​

Explanation: took the quiz