Aeronautical researchers have developed three different processes to pack a parachute. They want to compare the different processes in terms of time to deploy and reliability. There are 1,200 objects that they can drop with a parachute from a plane. Using a table of random digits, the researchers will randomly place the 1,200 items into three equally sized treatment groups suitable for comparison.

Which design is the most appropriate for this experiment?

Randomly number each item with 1, 2, or 3. Assign the items labeled 1 to the process 1 group, assign the items labeled 2 to the process 2 group, and assign the items labeled 3 to the process 3 group.
Number each item from 1 to 1,200. Reading from left to right from a table of random digits, identify 800 unique numbers from 1 to 1,200. Assign the items with labels in the first 400 numbers to the process 1 group. Assign the items with labels in the second 400 numbers to the process 2 group. Assign the remaining items to the process 3 group.
Number each item from 0000 to 1199. Reading from left to right on a random number table, identify 800 unique four-digit numbers from 0000 to 1199. Assign the items with labels in the first 400 numbers to the process 1 group. Assign the items with labels in the second 400 numbers to the process 2 group. Assign the remaining items to the process 3 group.
Select an item, and identify the first digit reading from left to right on a random number table. If the first digit is a 1, 2, or 3, assign the item to the process 1 group. If the first digit is a 4, 5, or 6, assign the item to the process 2 group. If the first digit is a 7, 8, or 9, assign the item to the process 3 group. If the first digit is a 0, skip that digit and move to the next one to assign the item to a group. Repeat this process for each item.

Answer:

The 4th statement. Because sulfur is not malleable.

Answer:

d

Explanation:

The weak base carbonate reacts with the water forming bicarbonate and the hydroxide ion.

The weak bases are given as the compounds that have the inability to get completely dissociated in water.

The carbonate is given as the weak base, as in water it remains constituted in the form of a bond with oxygen.

The reaction of water with the carbonate ion is given as:

[tex]\rm CO_3^{2-}\;+\;H_2O\;\rightleftharpoons HCO_3^-\;+\;OH^-[/tex]

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1.648 moles of ammonia will be required to produce 0.824 moles of nitrogen gas.

Mole is a very important unit of measurement that chemists use. A mole of something means you have 602,214,076,000,000,000,000,000 of that thing, like how having a dozen eggs means you have twelve eggs.

According to the reaction, 1 mole of nitrogen gas is produced by 2 moles of ammonia.

Then, 0.824 moles of nitrogen gas will be produced by:

1.648 moles of ammonia will be required to produce 0.824 moles of nitrogen gas.

Hence, 1.648 moles of ammonia will be required to produce 0.824 moles of nitrogen gas.

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In a nuclear fission reaction, a freely moving neutron is introduced to a nuclear fuel, then a neutron is absorbed by an atom's nucleus.

Nuclear fission is a process in which an unstable nuclei will convert into stable nuclei after releasing the energy in the form of particles.

When we introduce a freely moving neutron to the nuclear fuel of uranium-235 nuclei then this introduced neutron was absorbed by the nuclei and makes the nuclei more unstable. Then this unstable nuclei will convert into two nuclei in the addition of three neutrons.

Hence, a neutron is absorbed by an atom's nucleus.

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Answer:

Iron - Nails, Utencils, Appliances

Copper - Wiring

Aluminiem - Roofing, Ducting

Answer:

40

Explanation:

because NaOH makes 40 grams.

What Renata has granted to the manufacturer of the colored hair dye is called a patent.

A patent is a right given to a manufacturer to be the sole producer of a product for a given period of time. Usually, the patent has to last for a given number of years after which the technology becomes commonplace.

Hence, what Renata has granted to the manufacturer of the colored hair dye is called a patent.

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Entropy Change is the measure of the randomness of the thermodynamic system. The entropy change for the reaction is -49.3 J/K.

Entropy change is the ratio of the heat transfer of the system to the absolute temperature of the system.

The entropy of nickel = 182.1 J/mol. K

The entropy of oxygen = 205.0 J/mol. K

The entropy of nickel oxide = 37.99 J/mol. K

Entropy change is calculated as:

[tex]\begin{aligned}\Delta \rm S &= 2(37.99)-2(182.1)-205\\\\&= 75.98 - 364.2 - 205\\\\&= -493.22 \end{aligned}[/tex]

Therefore, -49.3 J/K is the entropy change.

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Answer:

a. energy changes during heating.

b. energy changes during chemical reactions.

c. color changes during chemical reactions.

d. Both (a) and (b)

Explanation:

The answer is D.Both (a) and (b)

Buffers are the solution that resists the change in pH. 1.39 ml of 5.90 M sodium hydroxide must be added to raise the pH to 5.75.

Henderson–Hasselbalch equation is used to determine the pH of the buffer by the equilibrium concentration of the acid and the conjugate base.

Moles of acetic acid are calculated as:

[tex]0.480 \times 0.0215 = 0.01032[/tex]

Moles of sodium acetate are calculated as:

[tex]0.480 \times 0.0275 = 0.0132[/tex]

The total number of moles is = 0.02352

Now, using the Henderson–Hasselbalch equation:

[tex]\rm pH = \rm pKa + log \dfrac{[Acetate]}{[Acetic\; acid]}[/tex]

Given,

pH = 5.75

pKa = 4.74

Substituting values in the above equation:

[tex]\begin{aligned} 5.75 &= 4.74 +\rm log \rm \dfrac{[Acetate]}{[Acetic\; acid]}\\\\10.2329 &= \rm \dfrac{[Acetate]}{[Acetic\; acid]}\end{aligned}[/tex]

Solving further:

[tex]\begin{aligned} 10.2329 &= 0.02352 - \rm \dfrac{[Acetic\; acid]}{[Acetic\; acid]}\\\\11.2329\; \rm [Acetic \; acid] &= 0.02352 \\\\&= 0.002093\end{aligned}[/tex]

Moles of acetate is calculated as:

0.02352 moles - 0.002093 moles = 0.021427 moles

Initial moles of acetate were 0.0132, added moles of acetate by the addition of the sodium hydroxide resulted in, 0.021427  - 0.0132 = 0.00822 moles of sodium hydroxide.

Volume is calculated as:

[tex]0.00822 \;\rm moles \times \dfrac{1\;\rm L}{5.90\;\rm M} = 0.00139 L[/tex]

Therefore, 1.39 mL of 5.90M of sodium hydroxide is added.

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Hydrogen atom is added denotes to something

So the

Hence.

Bromothymol blue will turn yellow

Answer:The equilibrium constant (kc) for the reaction 2HCl(g) =H2(g)+Cl2 (g) is 4×10^-34 at 25°C.

Explanation:

Answer:

c. contraction

Explanation:

Heating will cause substances to expand, or change their state (like solid to liquid) or it may be a chemical reaction.

The two liquids made a new substance.

A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity.

A chemical change occurs when some substances are transformed into different substances, with different nature and properties. In this case when both liquids are mixed a solid is formed.  This is an example of a change of state of the liquids reactants to the solid product, which has properties and characteristics different from that of the initial liquids of the mixture which is called a chemical change.

Hence, option D is correct.

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Answer:

See below

Explanation:

(NH4)2SO4   Molar weight (from periodic table)

       (N =14    H4 = 4   ) * 2 = 36

           S = 32   O4 = 64                  TOTAL = 132 gm/mole

N % =  ( 2*14) / 132 = 21.2%       molar mass = 28 gm

H % = (2 *4) / 132 =  6%            molar mass = 8  gm

S % =  32/132 = 24.2 %             molar mass = 32 gm

O % = (64) / 132 = 48.5%           molar mass = 64  gm

Answer:

The balloon will expand

Explanation:

Steam needs more space than the equivalent wt amount of liquid

696.32 mmHg is the final pressure of the gas.

The ideal gas equation, pV = nRT, is an equation used to calculate either the pressure, volume, temperature or number of moles of a gas.

Given data:

[tex]P_1[/tex] = 720 mmHg              

[tex]P_2[/tex] = ?

[tex]n_1[/tex] = 2.5 mol                

[tex]n_2[/tex] = 3.2 mol

[tex]V_1[/tex] = 34 L            

[tex]V_2[/tex] = 45 L

Formula

Combined gas law

[tex]\frac{P_1 V_1}{n_1} = \frac{P_2 V_2}{n_2}[/tex]

[tex]P_2[/tex] = 696.32 mmHg

Hence, 696.32 mmHg is the final pressure of the gas.

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6.99 grams of iron (Fe) would produce 10 g of rust (Fe2O3) when iron combines with oxygen to form rust.

The mass of a substance can be calculated as follows:

According to this question, iron combines with oxygen to form rust as follows:

4Fe + 3O2 → 2Fe2O3

First, we convert the mass of rust to moles as follows:

moles of Fe2O3 = 10g/159.69 = 0.063moles

Next, convert moles of Fe to mass as follows:

mass of Fe = 0.125 × 55.85 = 6.99g

Therefore, 6.99 grams of iron (Fe) would produce 10 g of rust (Fe2O3) when iron combines with oxygen to form rust.

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To prepare 0.194 M potassium acetate, add 2.379895 g of potassium acetate to a 125 mL volumetric flask and fill with water to the mark.

Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution.

The following data were obtained from the question:

Molarity of potassium acetate = 0.194 M

Volume of solution = 125 mL

Mass of potassium acetate =?

Next, we shall convert 125 mL to L. This can be obtained as follow:

1000 mL = 1 L

Therefore,

125 mL = 0.125 L

Thus, 125 mL is equivalent to 0.125 L.

Next, we shall determine the number of moles of potassium acetate in the solution. This can be obtained as follow:

Molarity of potassium acetate = 0.194 M

Volume of solution = 0.125 L

Moles of potassium acetate =?

Molarity = [tex]\frac{mole}{Volume}[/tex]

Cross multiply

Mole of potassium acetate = 0.194 M × 0.125

Mole of potassium acetate = 0.02425 mole

Finally, we shall determine the mass of potassium acetate

Molar mass of potassium acetate= 98.14 g/mol

Mass of potassium acetate =?

Mole = [tex]\frac{mass}{Molar mass}[/tex]

Mass of potassium acetate =0.02425  × 98.14

Mass of potassium acetate = 2.379895 g

Thus, to prepare 0.194 M potassium acetate, add 2.379895 g of potassium acetate to a 125 mL volumetric flask and fill with water to the mark.

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Answer:

10.4 moles

Explanation:

    n / 5.2   =   2  M

     n = 10.4  moles

Answer:Seeds are great sources of fiber. They also contain healthy monounsaturated fats, polyunsaturated fats and many important vitamins, minerals and antioxidants. When consumed as part of a healthy diet, seeds can help reduce blood sugar, cholesterol and blood pressure

Explanation:

Answer:

Seeds grow plants wherever they fall is in the right condition and can be used as a sort of food for humans

Explanation:

1066.7 ml of the stock solution must start with, preparing 2.00 L of a 0.800 M NaNO3 solution.

Volume is the space occupied by a three-dimensional object.

By the formula [tex]\rm M_1V_1= M_2V_2[/tex]

M1 is the initial molarity, 1.5 M

M2 is the final molarity, 0.800 M

V1 is the initial volume

V2 is the final volume, 2.00 L

Putting the values in the equation

[tex]\rm 1.5\;M \times V_1= 0.800\;M \times 2.00\;L\\\\V_1 = \dfrac{ 0.800\;M \times 2.00\;L}{1.5\;M} = 1066.7\;ml[/tex]

Thus, the initial volume is 1066.7 ml

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Intermolecular forces are the forces present between the molecules. The London dispersion forces are the strongest interparticle forces present in the ethane.

London dispersion forces are the intermolecular forces are the temporary forces present between the induced dipole formed by the electrons occupied in the atom.

The electrons of the atom are distributed symmetrically and are dispersed just as the light in quanta. In ethane molecule ionic, and hydrogen forces are absent and only LDF and dipole-dipole are present.

Therefore, LDF and dipole-dipole are the intermolecular forces that are present in ethane.

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Answer:

liquid

Explanation:

A solid is defined as substance with a set volume and form. A liquid is defined as substance with a set volume but no fixed form. A gas is substance that does not have a definite volume or shape. Plasma, like a gas, has no set volume or shape.

Answer: Acceleration and velocity

Explanation:

Newton's second law says that when a constant force acts on a massive body, it causes it to accelerate, i.e., to change its velocity, at a constant rate. In the simplest case, a force applied to an object at rest causes it to accelerate in the direction of the force.

Answer:

Moving with changing velocity

Explanation:

the resultant force acting on it is not zero

hence

Answer: Exosphere

Explanation:

Answer:

exosphere

Explanation:

the outermost layer of earth's atmosphere is called exosphere

Methane (CH4) with the smallest atomic size, would have the lowest boiling point.

It is the temperature at which the pressure exerted by the surroundings upon a liquid is equaled by the pressure exerted by the vapour of the liquid; under this condition, addition of heat results in the transformation of the liquid into its vapour without raising the temperature.

CH₄, SiH₄, GeH₄, SnH₄ are very similar. They are all in the same group and their molecular geometry is a tetrahedral.

They have covalent bonds. The key difference: The number of protons and electrons.

These are non-polar molecules, so there are no ionic bonds. There are no H bonded to a F, N or O, so there is no hydrogen bonds.

Dipole induced dipole forces (AKA London dispersion forces) dictate the boiling points of these atoms. It is the attraction between atoms that dictate how easily they can disperse.

The electrons in an atom are constantly moving due to their repulsion of each other. However, if one electron has moved and the other has not, it is temporarily charged.

The biggest molecule will have the highest boiling point. The more protons and electrons, the stronger the effect.

Therefore, Methane (CH4) with the smallest atomic size, would have the lowest boiling point.

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Take the cuttings from the trees and place them around in different enviornements, if the trees grow up to be the expected size in a different eviornement then the the scientists' claim is correct.

I didn't understand at first either, the question is worded a little strangly, but I believe this should answer the question that was asked.