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PolarNik [594]
3 years ago
6

HELP ME PLEASE. Which of the following statements is true for electrolysis? New atoms are created by destroying old atoms. A com

pound is heated to form multiple products. An electric current is used to synthesize a substance. An electric current is used to decompose a substance.
Chemistry
1 answer:
babymother [125]3 years ago
5 0
<h3>Answer:</h3>

An electric current is used to decompose a substance.

<h3>Explanation:</h3>

Concept tested: Electrolysis

We can answer the question by asking ourselves important questions

First; What is electrolysis?

  • Electrolysis refers to the process through which molten or aqueous compound known as electrolytes are decomposed by passing electric current through them.

Second; What are electrolytes?

  • Electrolytes are substances in either molten or aqueous form and are good conductors of electric current.
  • Electrolytes are good conductors of electric current due to the presence of mobile ions.

Third: What happens during electrolysis?

  • Electrolytes are therefore decomposed by passing electric current through them resulting to formation of new elements or molecules.
  • For example, when molten sodium chloride is decomposed by passing electric current through it, sodium metal is released at the cathode while chlorine is released at the anode.
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Which of the following properties would be the same among isotopes of the same element?
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Answer : The properties which would be the same among isotopes of the same element are Flammability and Color

Explanation :

Isotopes are the elements that have same number of electrons and protons but they differ in number of neutrons.

The chemical properties of an element are determined by its valence electrons and since isotope have same number of electrons, they have similar chemical properties.

But isotopes have different number of neutrons. Neutrons are the subatomic particles which are present in the nucleus. They are charge less particles and they have mass. Therefore when the elements have different number of neutrons, their atomic masses differ.

As a result, isotopes have different mass related physical properties.

Let us discuss the given properties now

1) Flammability : Flammability in simple words means the ability of the substance to catch fire or the ability to burn. This is mainly dependent on the reactivity which is in turn dependent on the number of electrons.

Since the isotopes have same number of electrons, they show similar flammability.

2) Density : Density is defined as mass per unit volume. This property involves mass and we know that isotopes have different masses. Therefore they have different densities too.

3) Melting point : Melting point is a physical property which is mainly dependent on the molecular weight of the substance. Since isotopes have different masses, they tend to show different melting points.

4) Color : The color of the element is mainly dependent on the arrangement of electrons around the nucleus. Isotopes have same number of electrons which means the arrangement would also be the same. Therefore the isotopes of the same element do not show different colors.

The properties which would be same among isotopes of the same element are

1) Flammability

4) Color

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