How long would it take for a sound impulse to travel through an aluminum rod 1,500 meters long?

0.45 sec
4.5 sec
3.4 sec
0.29 sec

Answer:

three to four days

Explanation:

Leftover steak is safe to eat after three to four days in the refrigerator—any longer and you could catch a foodborne illness from bacteria growth. Bacteria can also grow on perishable food that has been left out at room temperature for over two hours or kept at a temperature lower than 40°F.

The monomer from which the very common commercial polymer poly vinyl chloride is vinyl chloride with the formula, CH₂Cl = CH₂Cl. The PVC is formed by addition polymerization.

Polymerization is the process of combination of smaller molecules or compounds in large number to form macromolecules or polymers. There are a lot of polymers that we are using daily in the form of bags, plastics, bottles etc.

Among the common polymers we use PVC or poly vinyl chloride is very essential commercial polymer. The monomer of PVC is vinyl chlorides.

The polymerization of n vinyl chloride to form polyvinyl chloride is given below.

[tex]\rm n CH_{2}Cl = CH_{2}Cl \rightarrow (-CH_{2}Cl - CH_{2}Cl -)__{n}[/tex]

The polymerization of vinyl chloride is taking place through addition mechanism. The vinyl chloride monomer repeatedly add one by one to form the polymer.

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P₁V₁=P₂V₂

760.5=P₂.3

P₂=1266.6 torr

Answer:

True

Explanation:

Differences in water density affect vertical ocean currents (movement of surface ocean water to the bottom of the ocean and movement of deep ocean water to the surface). … Denser water tends to sink, while less dense water tends to rise.

Differences in the density of seawater cause it to move. Therefore, the given statement is true.

The substance's mass per unit of volume is known as its density (volumetric mass density or specific mass). Although the Roman letter D may also be used, the sign most frequently used for density is (the lower case Greek letter rho). Density is calculated mathematically by dividing mass by volume.

Where m represents the mass, V is the volume, and is the density. Density is sometimes roughly characterized as weight every unit volume, while this is incorrect technically; this quantity is much more precisely known as specific weight. One example of this is in the US oil and gas business. Differences in the density of seawater cause it to move.

Therefore, the given statement is true.

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The volume occupied by 10 moles of hydrogen gas at 145K and 705 Torr is 128.01L.

The volume of a gas can be calculated using ideal gas law equation as follows:

PV = nRT

Where;

0.93 × V = 10 × 0.0821 × 145

0.93V = 119.05

V = 128.01L

Therefore, the volume occupied by 10 moles of hydrogen gas at 145K and 705 Torr is 128.01L.

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Answer: False, I believe.

Explanation: If a Hypothesis is proven correct, then another experiment to strengthen that Hypothesis is should be done.

Answer:

A. 38.4 [gr].

Explanation:

all the details are provided in the attachment, the answer is marked with orange colour.

Answer:

Sodium+ Sulphuric Acid--> Sodium Sulphate+ Water

Answer

The structural formula are similar to molecular formulas but show how atoms are bonded together.

Explanation:

The structural formula for a compound gives the same information as its molecular formula (the types and numbers of atoms in the molecule) but also shows how the atoms are connected in the molecule.

Answer:

The products to ZnBr2 + F2 -> Znf + Br2

When we balance this equation we get the following:

2ZnBr2 + F2 -> 2Znf + 2Br2

Hope this helps !!!

Answer 2. Accept with minor revisions: Also known as conditional acceptance, this decision means that the paper requires minor changes for it to be ...

wer:

Explanation:

Answer:

600

Explanation:

because if there's 6 molecules in each then 6×100 is 600

Answer:

+4

Explanation:

In PbO2, oxygen exhibits an oxidation number of -2 (since it's not a peroxide or superoxide):

Let the oxidation number of Pb be x. Then, for the compound to be neutral, the oxidation numbers of all atoms should add up to zero.

⇒ x + (−2) + (−2) = 0

x = +4

So the oxidation no. of Pb is +4.

I hope this helps.

The exploration of the mid-cayman rise is intended to discover that what life may have been like before the evolution of photosynthesis.

Mid - cayman rise is an area or era where only some amount of light is coming but still existence of life is present there.

As we know that plants make their own food by the process called photosynthesis in the presence of light, but this is not the scenario for all the time. Before the discovery of photosynthesis plants also prepared their own food.

Hence, option (a) is correct.

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Answer:

A

Explanation:

The experiment referenced here involves the use of Y32P-ATP. The atom involved in the site of the covalent attachment is the N atom in Aminomethylcyclohexane (AMC).

Given that Aminomethylcyclohexane  (AMC) had been linked around the carboxyl side, it, therefore, means that that type of linkage called the Amide-Linkage (That is N-acylation)  can be utilized in the covalent bonding of the fluorophore into the peptide

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Answer:

Soap and tomato juice :)

Explanation:

Using different types of pH levels may affect the results, so that is why I think this would be a good experiment to do. :)

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Answer:

Using litmus paper

Explanation:

Answer:

Potassium bromide

Explanation:

Answer:

Chemical Energy

Explanation:

Energy, Molecules and Chemical Reactions. Energy, potential energy, is stored in the covalent bonds holding atoms together in the form of molecules. This is often called chemical energy.

Answer:

[tex]2.55 \times {10}^{24} [/tex]

atoms

Answer:

When matter interact with EMR then spectrum is obtained. We can understand both spectra using Bohr's hydrogen spectrum. let's have a look on Bohr's hydrogen spectrum what does it say. It says when a electron gains energy it moves from one energy level to other(lower to higher) which is Absorption phenomenon. When the electrons returns from excited state to ground state they emits several spectral lines. this spectrum is called as emission spectrum. inshort the

Emission spectrum is spectrum of electromagnetic radiations that were emitted from the higher energy state(Excited state) to lower energy state(Ground state). and study of emission spectrum is known as AES (Atomic Emission spectroscopy).

When an atom or ion is subjected to EMR, it absorbs certain level of radiations, and when this absorbed energies are studied under spectroscopy they are plotted as absorption spectrum, and study of Absorption spectrum is known as AAS (Atomic Absorption spectroscopy).

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Answer:

D

Explanation:

An ionic solid is a crystalline solid held together by charge attractions or an ionic bond.

Ionic bond or electrovalent bond is a type of bond which is formed between two elements when there is an exchange of electrons which takes place between  the atoms resulting in the formation of ions.

When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge  and forms an ion called the anion.

As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond.They are good conductors of heat and electricity. They have high melting points. These compounds are brittle.

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Answer:

Nucleic acids

Explanation:

all organic foods (fruit, meat, etc) contain it to some degree. because all organic foods have dna in them.

Answer:

In my sense your answer must be Pelvic cavity.

Answer:

B

Explanation:

it's has more water and will go active way faster

Answer:

Beaker b

Explanation:

This is because the temperature in beaker b is higher. Hot water has more kinetic energy. Therefore, it's particles move faster and collide more frequently with the particles of antacid tablet. So, the reaction occurs faster.

Hope this helps =)

Answer:

the answer is chemical change because the act of rusting changes the substance of iron

Explanation:

Best describes the forces in the nucleus of a stable atom is the strong nuclear force balances out the electrostatic force.

The center region of an atom, which is composed of two different types of particles, is known as the atomic nucleus. Protons with positive charges and neutrons with no charges are present. Because of the strong electrostatic attraction between positively charged protons, atomic nuclei should be unstable, however they occasionally remain stable for more than a billion years.

The stability of nuclei suggests that protons and neutrons are attracted to one another by an attractive force. The strong nuclear force, also known as the residual strong force, is responsible for every individual atomic nucleus' stability. Neutrons and protons are held together by this basic force of nature. It is used to explain the atom's and its nucleus' stability, which is otherwise puzzling. It can be used to explain the origin of all atoms and, consequently, the origin of all known simple and complex molecules.

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H_2O is the chemical formula of compound water.

Here

In water

There are