If the density of ethanol is 0.785 g/mL. What should the mass of 0.998 L of rum
be in grams if it contains 75% ethanol? Assume that the remainder of the rum has
a density equivalent to water which is 0.997 g/mL.

The first step of the reaction, we have  reaction between a nucleophile and an electrophile.

We can see that in the first step of the reaction, we have  reaction between a nucleophile and an electrophile. In this case, the electrophile would have to be an alkyl halide which produces a carbocation as show in the image attached.

What we have here is quite similar or  like most of the organic reactions, this reaction occurs in a number of detailed or smaller steps and each step of the reaction is going to help to bring us closer to the end product of the entire steps of the reaction which is wat we target as we carry out the particular reaction.

The second step involves the reduction of the alkyne with the use of a Lindlar catalyst. As such the reaction is poisoned and it stops at the alkyne stage rather than going on to obtain the alkane.

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Answer:

The equation for a volume of a sphere is V= (4/3)πr3

The above equations says we need to find the radius of our sphere. According to https://www.ptable.com/ the radius of a gold atom is 144 pm.

The questions wants the answer to be in cm3 which means we need to convert picometers into centimeters. 1cm= 1010pm

144pm x (1cm/1010pm) = 1.44 x 10-8cm

Now we plug the radius of the gold atom into the volume equation.

V= (4/3)π(1.44x 10-8cm)3 -----> Answer= 1.25x10-23 cm3

By performing the calculations and comparing the F-value to the critical F-value, we can determine whether the variance of the Gravimetric method differs significantly from that of the Volumetric method in the analysis of iron in sample A.

To determine if there is a significant difference between the variances of the Gravimetric and Volumetric methods used to determine iron in sample A, we can employ the F-test, also known as Fisher's F-test or the variance ratio test. The F-test compares the ratio of the variances to assess if there is a statistically significant difference.

Let's denote the Gravimetric method as Group 1 and the Volumetric method as Group 2. The first step is to calculate the variances for each group.

For Group 1 (Gravimetric):

Variance_1 = [(13.0-13.1)^2 + (13.5-13.1)^2 + (13.3-13.1)^2 + (12.9-13.1)^2 + (15.1-13.1)^2 + (13.3-13.1)^2 + (12.7-13.1)^2 + (12.6-13.1)^2 + (13.1-13.1)^2] / (n-1)

For Group 2 (Volumetric):

Variance_2 = Calculate the variance in the same manner for the data obtained from the Volumetric method.

Once we have the variances, we can calculate the F-value using the formula:

F = Variance_1 / Variance_2

Next, we need to compare this F-value with the critical F-value at a chosen significance level (usually α = 0.05 or 0.01) and degrees of freedom for each group (df_1 and df_2).

If the calculated F-value is greater than the critical F-value, it indicates a significant difference between the variances of the two methods. Conversely, if the calculated F-value is less than the critical F-value, there is no significant difference in the variances.

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Answer:

No. of atom =

no.of moles x avagardro's number xatomicity

= weight /molar mass x No x atomicity

=8.2/142 x6.02x10^23 x 4

=0.346 x 10^23(approximately)

Answer:

Answer:  What can experiments in a lab tell us about substances on Titan? Experiments in a lab can tell us that the lake did not evaporate in 2007 because the molecular attraction was a lot stronger, then it got weaker overtime.

How does Dr. Hayes' and Dr. Malaska’s research differ? Why are both research projects important? Their research differs because they were both talking about different things, Hayes was talking about how many lakes there were, while Malaska's was doing more hands on stuff like experiments. Both are important because we need to learn how the lakes formed, but we also need to do hands on experiments.

Explanation:

Answer:

Branched chain

Cycloalkane

Straight chain

Explanation:

Anything that can be weighed and takes up space is considered matter. Therefore, matter has both mass and volume.

Pure substances are those that contain only one type of particle and are devoid of any mixtures. Iron, aluminum, silver, and gold are some examples of pure substances.

A combination is said to be heterogeneous if its composition is not constant throughout. Vegetable soup is a complex concoction. Each mouthful of soup will have differing percentages of the various veggies and other ingredients.

A mixture is said to be homogenous if its composition is constant throughout. Because the dissolved salt is evenly distributed throughout the whole salt water sample, the salt water described above is homogenous.

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Answer:

I think the answer could be A

Explanation:

because there is different amounts of gravity which makes us lighter, although it could be wrong

Answer:

Volume = 3.4 L

Explanation:

In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:

CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)

Now, let's calculate the number of moles in 15.2 g CaCO₃:

mole no. = \(\mathrm{\frac{mass}{molar \ mass}}\)

                 = \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)

                 = 0.1518 moles

From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.

Hence, from the formula for the number of moles of a gas, we can calculate the volume of  CO₂:

mole no. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)

⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)

⇒ Volume = 0.1518 × 22.4

                 = 3.4 L

Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.

The electron configurations that are not valid among the options are 1s²2s²2p 3s 3p 4s²4d¹04p5 and 1s²2s²2p 3s³3d5. Options 1 and 2.

The electron configuration of atoms using the various orbital levels follows the order: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p.

Also, according to Afbau principle, orbitals with low energy levels are filled with electrons before orbitals with higher energy levels.

Using the above,  1s²2s²2p 3s 3p 4s²4d¹04p5 is incorrect for some reasons:

1s²2s²2p 3s³3d5 is incorrect because:

The remaining electron configurations are correct with correctly placed electrons in the various orbitals.

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solar energy

wind energy

hydro energy

tidal energy

geothermal energy

The sample that uses the substance that Jacob and Natalie should use to make a cold pack that will do the best job of keeping food cool is sample 2, because it absorbs the most energy (option B).

Endothermic refers to a chemical reaction that absorbs heat energy from its surroundings. This ensures that the temperature of the surroundings is cool or has a lower temperature.

According to this question, Jacob and Natalie are asked by their science teacher to design a warming or cooling device. They make use of certain substances, however, sample 2 has the lowest final temperature of -4°C.

This shows that sample 2 absorbs the most energy, hence, would be the best for keeping the food cool.

The incomplete question is as follows:

Jacob and Natalie are asked by their science teacher to design a warming or cooling device. They decide to design a cold pack that can be used to help keep food cool. Jacob and Natalie read about different substances that can be used inside cold packs and learn that most cold packs use endothermic reactions to cool objects.

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Answer: A model would be useful because the model makes the concepts easier to understand.

Explanation:

Models are helpful tools in science education that can be used to enhance explanations, spark discussion, make predictions, provide visual representations of abstract concepts, and create mental models.

Answer:

zinc forms more than one ion

I think the Answer is B

In a double-displacement reaction, the cations and anions switch places to produce the product. The ions swap their place to yield new compounds. Thus, option B is correct.

A double-displacement reaction, also called salt metathesis reaction is a process involving the exchange of the bonds and the positive and the negative ions to result in compounds different from the reactant.

The positively charged cation and the negatively charged anion swap their places and produce new products or compounds. It can be of three types namely neutralization, precipitation, and gas formation.

Therefore, the ions (cations and anions) switch their places in a double-displacement reaction.

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Heat transferred is already given in the question

Answer:

It is homogeneous

Explanation:

Answer:

Unsuccessful completion of this stage can result in an inability to trust, and therefore an sense of fear about the inconsistent world. It may result in anxiety, heightened insecurities, and an over feeling of mistrust in the world around them.

Hope this helps!

Answer: Unsuccessful completion of this stage can result in an inability to trust, and therefore an sense of fear about the inconsistent world. It may result in anxiety, heightened insecurities, and an over feeling of mistrust in the world around them.

Explanation:

1 mol CO2 = 6.022x10^23 molecules of CO2

6x10^22 molecules of CO2 x [1 mole of CO2/6.022x10^23]

= 0.0996 moles of CO2

1 mole of carbon dioxide (CO2) contains 6 x 10^22 molecules.

There are two methods to calculate it:

1st method:

GIVEN DATA:

number of molecules=6.022×10²²molecules

Avogadro's number Na=6.022×10²²

TO FIND:

number of moles

SOLUTION:

As we know that number of moles=number of molecules/Na

number of moles=6.022×10²²/6.022×10²²

number of moles=1 moles

Avogadro’s number tells us the number of particles in 1 mole (or mol) of a substance. These particles could be electrons or molecules or atoms. The value of Avogadro’s number is approximately 6.022140857×1023 mol−1.

2nd method:

As we know that a mole of a substance contains 6.022×10²² particles of that substance so

1 MOLE OF CO2=6.022×10²²MOLECULES OF CO2

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Answer:

same bud same

Explanation:

tttt5566555tggf and I don't

Answer:

B is correct answer

Explanation:

Answer:

B.

Explanation:

Answer:

A

∆H = 28 kJ/mol, ∆S = 0.109 kJ/(mol-k)

Explanation:

A P E X

The spontaneous reaction at 298 K is the one having

ΔH = 28 kJ/mol, ΔS = 0.109 kJ/(mol-K)

We know the formula of Gibb's free energy as-

ΔG = ΔH - TΔS

ΔG = 28 - (298 × 0.109)

ΔG = -4.48

If a reaction is spontaneous, change in Gibb's free energy is negative and change in entropy is positive.

Therefore, The spontaneous reaction at 298 K is the one having

ΔH = 28 kJ/mol, ΔS = 0.109 kJ/(mol-K)

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Answer:

4050 mg or it might be 503 mg

Explanation:

Answer:

The answer is D

Explanation:

Non metals are:

Hydrogen (H)

Sulphur (S)

Phosphorus (P)

Carbon (C)

Fluorine (F)

Oxygen (O)

Nitrogen (N)

Chlorine (Cl)

Bromine (Br)

Helium (He)

Argon (Ar)

Iodine (I)

Neon (Ne)

Krypton (Kr)

Radon (Rn)

Selenium (Se)

Xenon (Xe)

Answer:

0.04446 km/hr

Explanation:

For this question, we will be using the dimensional analysis method. Dimensional Analysis (also called Factor-Label Method or the Unit Factor Method) is a problem-solving method that uses the fact that any number or expression can be multiplied by one without changing its value. It is a useful technique.

Steps:

Answer:

B

Explanation:

don't try to do that at home

The freezing point of the 0.520m aqueous solution of NaCl is -0.96°C.

Freezing point refers to the temperature at which a liquid freezes, and the solid and liquid phases are in equilibrium.

Using the equation below, the freezing point can be calculated;

∆T = Kf. m

Where;

According to this question, the molality of the NaCl solution is given as 0.520m.

∆T = 1.86°C/m × 0.520m

∆T = 0.96°C

T (solution) = T (water) – ∆T

T (solution) = 0°C - 0.96°C

T (solution) = -0.96°C

Therefore, -0.96°C is the freezing point of the solution.

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Answer:

-1.934

Explanation:

0 - {(0.520) x (1.86) x (2)}