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emmasim [6.3K]
3 years ago
8

Which of these processes indicates that smelting copper is a chemical change?

Chemistry
2 answers:
Marina86 [1]3 years ago
8 0

it involves melting copper to form liquid metal. it involves heating charcoal to high temperatures. it involves drawing copper into long wires. it involves breaking molecular bonds between copper compounds.

Elan Coil [88]3 years ago
7 0

Answer:

  1. AS ITS CANT BE REVERSED
  2. IT IS PERMANEMT CHANGE
  3. NEW SUBSTANCE FORMED
  4. HEATING OS USED OR CHEMICAL REACTION.
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What Do You Think It Means To Have a Balanced Or Unbalanced Chemical Equation?
Hatshy [7]

Answer:

A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.

Explanation:

4 0
3 years ago
The C2-C3 single bond in butane freely rotates at room temperature, see equation (1) below. In contrast, the C2-C3 single bond i
Murrr4er [49]

Answer: Rotation occurs at single bonds that are sigma bonds. Rotational barrier is the amount of  activation energy required to covert rotamer to another by rotation that occurs around the sigma bond(C-C single bond). Due to the presence of steric hindrance that is the nonbonding interaction effects the reactivity of ions and molecules, activation energy increases. So the rotational barrier in butenyl cation is high.

8 0
4 years ago
Question 2 The metal molybdenum becomes superconducting at temperatures below 0.90K. Calculate the temperature at which molybden
LenKa [72]

Answer:

Temperature at which molybdenum becomes superconducting is-272.25°C

Explanation:

Conductor are those hard substances which allows path of electric current through them. And super conductors are those hard substances which have resistance against the flow of electric current through them.

As given, molybdenum becomes superconducting at temperatures below 0.90 K.

Temperature in Kelvins can be converted in °C by relation:

T(°C)=273.15-T(K)

Molybdenum becomes superconducting in degrees Celsius.

T(°C)=273.15-0.90= -272.25 °C

Temperature at which molybdenum becomes superconducting is -272.25 °C

5 0
4 years ago
Sketch the structure of the nitrogen containing product that is formed when ethalymine reacts with water.
Igoryamba

Answer:

Here's what I get  

Explanation:

Ethylamine has an N atom with a lone pair of electrons.

It can act as a Brønsted-Lowry base and accept a proton from water and become an ethylammonium ion.

The structure of the ion is shown below (there is a C atom at each of the four-way bond intersections).

3 0
3 years ago
At 304 K, a 9.6 L tank contains 1.9 moles of H2 gas under an unknown pressure in atm. What is the pressure of the gas in the tan
ratelena [41]

Answer:

The pressure is 4.939 atm

Explanation:

As we know

PV = nRT

where P is the pressure

V is the volume

n is the total number of moles

R is the gas constant

and T is the temperature

Substituting the given values we get -

P * 9.6 = 1.9 * 0.0821 *304\\P = 47.420/9.6\\P = 4.939

The pressure is 4.939 atm

8 0
3 years ago
Read 2 more answers
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