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qaws [65]
4 years ago
14

Cold working of a material... a) Is conducted at room temperature. b) Is conducted inside a refrigerator. c) Is conducted below

the recrystallisation temperature. d) Is conducted above the recrystallisation temperature
Chemistry
1 answer:
Oduvanchick [21]4 years ago
5 0

Answer:

The answer is:

c) Is conducted below the recrystallisation temperature

Explanation:

In cold working the metal goes through a process of plastic deformation that is conducted below its recrystallization point (which its usually at room temperature), this in order to change permanently the makeup of its crystals. The temperature at which the process happens is low enough so that atoms cannot rearrange themselves.

The resulting metal is more resistant to deformation, and has an increased hardness and tensile strength.

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Please help on this one?
Bezzdna [24]

Answer:

\text{C. } _{36}^{85}\text{Kr}

Explanation:

Your nuclear equation is  

_{35}^{85}\text{Br} \longrightarrow \, _{-1}^{0}\text{e} +\, _{x}^{y}\text{X}

The main point to remember in balancing nuclear equations is that

  • the sum of the superscripts and must be the same on each side of the equation.
  • the sum of the subscripts must be the same on each side of the equation.  

Then  

85 = 0 + y, so y = 85 - 0 = 0  

35 = -1 + x, so x = 35 + 1 = 36

The nucleus with atomic number 36 and atomic mass 85 is krypton-85.  

The nuclear equation becomes  

_{35}^{85}\text{Br} \longrightarrow \, _{-1}^{0}\text{e} + \, _{36}^{85}\text{Kr}

4 0
3 years ago
Read 2 more answers
How many molecules of oxygen are there in 1.00 dm3 of oxygen at standard pressure and a temperature of 273 K. Give your answer t
rewona [7]
  • Pressure=p=1atm
  • Temperature=T=273K.
  • V=1dm^3=1L

we need no of moles

\\ \tt\hookrightarrow PV=nRT

\\ \tt\hookrightarrow n=\dfrac{PV}{RT}

\\ \tt\hookrightarrow n=\dfrac{1}{273(8.314)}

\\ \tt\hookrightarrow n=1/2269.7=0.0004mol

No of molecules=No of moles×Avagadro no

\\ \tt\hookrightarrow 0.0004(6.023\times 10^{23})

\\ \tt\hookrightarrow 2.4\times 10^{20} molecules

5 0
2 years ago
Read 2 more answers
Can someone please help me if you can’t do A B and C Just do A and also for A it’s asking for what the air temperature is not th
Lapatulllka [165]
Hi! Do you still need help! If so I would be more than glad to help!
5 0
3 years ago
I really need help with this ASAP<br>​
Norma-Jean [14]

Answer:

1) Reaction rate, in chemistry, the speed at which a chemical reaction proceeds. It is often expressed in terms of either the concentration (amount per unit volume) of a product that is formed in a unit of time or the concentration of a reactant that is consumed in a unit of time.

2) By collecting the hydrogen gas that is produced over water or in a syringe, rate graphs can be produced. The volume of gas produced and the time taken need to be recorded. The rate of the same reaction could be monitored by measuring the change in the mass of reactants as they react to form products.

6 0
3 years ago
128.3 grams of methane (CH4) is equal to how many moles of methane
Neko [114]
About 8.0 moles of methane.Number of moles = MassMolar mass.

And thus we get the quotient:

128.3⋅g16.04⋅g⋅mol−1=8.0⋅moles of methane.

Note that the expression is dimensionally consistent, we wanted an answer in moles, and the quotients gives, 1mol−1=11mol=mol as required.

6 0
4 years ago
Read 2 more answers
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