CHEMISTRY HIGH SCHOOL

The fabrication method that joins together materials, usually metal, is known as __________.a. casting
c. cutting
b. milling
d. welding

Answers

Answer 1
Answer: The correct answer is (d.) welding. Welding is a fabrication method that joins together materials, usually metal. by causing fusion. This method melts the materials upon joining it together  for a specific temperature without melting the base metal.
Answer 2
Answer:

Answer:

d. welding is the correct answer.

Explanation:

  • The fabrication method that joins together materials, usually metal, is known as welding.
  • Welding is a process by which materials are joined by melting their parts.
  • In the welding process metals parts are joined by using heat.
  • The heat is supplied with the help of a gas flame or by an arc that melts the metal parts and enabling them to cool producing fusion.
  • Welding is used joints the dissimilar metals and thin metals, sheets.

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Hook was the first to discover cells in a cork. true or false?

Researchers have now been able to cool substances to absolute zero.
a. True
b. False

Answers

Answer:

The correct option is B) false.

Explanation:

Absolute zero is the point where it is not feasible to cool further.

The lowest possible temperature is 0 kelvin which is also known as absolute zero. In degrees its corresponds to –273.15 degrees Celsius.

it is not possible to reach or cool a substance to absolute zero although nearby temperatures can be reached.

Consider the provided statement.

Researchers have now been able to cool substances to absolute zero is a false statement.

The correct option is B) false.
This Answer Is False.

What is the ∆G for the following reaction under standard conditions (T = 298 K) for the formation of NH4NO3(s)? 2NH3(g) + 2O2(g) NH4NO3(s) + H2O(l)Given:
NH4NO3(s): ∆Hf = -365.56 kJ ∆Sf = 151.08 J/K.
NH3(g): ∆Hf = -46.11 kJ ∆Sf = 192.45 J/K.
H2O(l): ∆Hf = -285.830 kJ ∆Sf = 69.91 J/K.
O2(g): ∆Hf = 0.00 kJ ∆Sf = 205 J/K.

Answers

∆G =  ∆H - T∆S

NH3: ∆G = -46.11x10^3 - (298)(192.45) = -103460.1 J
O2: ∆G = 0 - (298)(205) = -61090 J
NH4NO3: ∆G = -365.56x10^3 - (298)(151.08) = -410581.84 J
H2O: ∆G = -285.830x10^3 - (298)69.91) = -306663.18 J

∆Grex = ∆Gproducts - ∆Greactants
∆Grex = (-410581.84 +  -306663.18) - (-103460.1/2 + -61090/2)
∆Grex =-634969.97 J/mol = -634.97 kJ/mol

Over 99% of the mass of an atom is located

Answers

in the nuclues

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A similarity between the forces involved in both ionic and covalent bondingis that bothO A) involve the sharing of electrons.O B) involve the transfer of electrons.O C) involve the attraction of opposite charges.requre same amountof energy toereakther bonds

Answers

Stating the difference between covalent and ionic bonding....

ionic bonds consist of the transfer of electrons, and covalent consists of the sharing of electrons.

This being said..answer choices A and B are out of the picture.

Thus, answer choice C is your answer.

Involve the attraction of opposite charges;require same amount of energy to break their bonds.

Why would an electrician use parallel circuits to wire the lights in each room of a house instead of using a series circuit?A.
When electricians get their license, they are only licensed to install parallel circuits. Most electricians aren't certified to install series circuits.

B.
Parallel circuits prevent electrons from flowing if part of the circuit is broken and therefore prevent fires. Series circuits cause more fires because electrons still flow.

C.
Electrons continue to flow in a parallel circuit even if part of the circuit is broken. In a series circuit, a break such as a burned out lightbulb would cause the current to stop in the whole room.

D.
Parallel circuits are much easier to wire and are required by the electrical code for housing construction in most communities. Series circuits are sometimes used with special approval.

Answers

C: Electrons continue to flow in a parallel circuit even if part of the circuit is broken. In a series circuit, a break such as a burned out lightbulb would cause the current to stop in the whole room!

Which of these phrases best describes an atom?(1) a positive nucleus surrounded by a hard negative shell(2) a positive nucleus surrounded by a cloud of negative charges
(3) a hard sphere with positive particles uniformly embedded
(4) a hard sphere with negative particles uniformly embedded

Answers

number two because of yall study this in sciwnce class yall will get it
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