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alexandr1967 [171]
4 years ago
11

An Unknown silvery powder has a constant melting point it does not physically or chemically separate into other substances how w

ould you classify these unknown substance ?
Chemistry
2 answers:
nydimaria [60]4 years ago
3 0
The classification of this unknown substance would be an element.
Jlenok [28]4 years ago
3 0

Answer:

Element

Explanation:

Elements are seen as the building blocks of matter that cannot be broken down by simplier substances.

Dmitri Ivanovich Mendeleev was a Russian chemist and also an inventor. He is credited as being the creator of the first version of the periodic table of elements. He is predicted elements using the periodic table which are yet to be discovered.

Atoms are the smallest particle of an element.

Proton is a particle in the atom that has a positive charge.

Electron is a particle in the atom that has a negative charge

Neutron is a particle that has no charge and is in the atom

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The greatest amount of energy released per gram of reactants occurs during a(1) redox reaction
masya89 [10]

Answer : The correct option is, (2) Fission reaction.

Explanation :

  • Fission reaction : This is a type of nuclear reaction in which the splitting of bigger nuclei into two smaller nuclei takes place. During this process, the large amount of energy is released.
  • Redox reaction : This is an oxidation-reduction reaction in which the electrons transferred between the two molecules.
  • Substitution reaction : In this reaction, one functional group is replaced by the another functional group in a chemical compound.
  • Neutralization reaction : In this reaction, the acid and base react to give water and a salt.

Redox reaction, substitution reaction and neutralization reaction are the chemical reactions in which the heat releases when the chemical bonds are breaking and forming.

Therefore, the greatest amount of energy released per gram of reactants occurs during the fission reaction.

4 0
3 years ago
Read 2 more answers
Na+CL2=2NACL is the balanced reaction for the formation of table salt. Given 20 grams of Na and 10 grams of Cl2, which reactant
Elina [12.6K]

Excess reactant : Na

NaCl produced : = 16.497 g

<h3>Further explanation</h3>

Given

Reaction(balanced)

2Na + Cl₂⇒ 2NaCl

20 g Na

10 g Cl₂

Required

Excess reactant

NaCl produced

Solution

mol Na(Ar = 23 g/mol) :

= 20 : 23 = 0.87

mol Cl₂(MW=71 g/mol):

= 10 : 71 g/mol = 0.141

mol : coefficient :

Na = 0.87 : 2 = 0.435

Cl₂ = 0.141 : 1 = 0.141

Limiting reactant : Cl₂(smaller ratio)

Excess reactant : Na

Mol NaCl based on mol Cl₂, so mol NaCl :

= 2/1 x mol Cl₂

= 2/1 x 0.141

= 0.282

Mass NaCl :

= 0.282 x 58.5 g/mol

= 16.497 g

4 0
3 years ago
3. Joseph took some sodium hydroxide solution in a petri dish and dipped a red litmus paper into it. The red litmus paper turned
olasank [31]

Answer:

Blue Litmus will change into red if it is added in sodium hydroxide

Explanation:

7 0
3 years ago
Why we use cotton cloth to mop the floor?
ch4aika [34]

Answer:

because cotton have a good absorbing quality and can absorb water more which is used to mop the floor

Explanation:

4 0
2 years ago
Which of the following is a heterogeneous mixture?
AleksAgata [21]

Answer: It would be paint.

Explanation: it would be paint because it doesn't come completely together. another example of a heterogeneous mixture could be cereal and milk.

6 0
4 years ago
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