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LenaWriter [7]
3 years ago
6

How many half-lives are required for three-fourths of the nuclei of an isotope in a sample to decay?

Chemistry
1 answer:
prisoha [69]3 years ago
5 0
2 half lives are required.
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A molecular covalent substance (such as co2) has a low melting point because the covalent bonds that hold the molecules together
Leona [35]

A molecular covalent substance (such as co2) has a low melting point because the covalent bonds that hold the molecules together are weak and do not require much energy to break:- False.

What are covalent bonds ?

An electron transfer that leads to the formation of electron pairs between atoms is known as a covalent bond. When atoms share electrons, a stable balance of the repulsive and attractive forces among them is known as covalent bonding. These electron pairs are also known as bonds or shared pairs.

It is a molecular compound, which is a mixture of at least two atoms—the smallest building blocks of matter—joined by a covalent bond. These atoms are joined by a covalent bond, which is formed when electrons are shared.

Learn more about covalent bond here:-

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2 years ago
Which of these solutes raises the boiling point of water the most?
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I think the answer would be Ionic sodium phosphate (Na3PO4) because it has the greatest boiling point elevation.
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3 years ago
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The cis and trans geometric isomers of a compound have different chemical and physical properties. Draw the structure of the geo
frutty [35]

<u>Answer:</u> The structure of the geometrical isomers are attached below.

<u>Explanation:</u>

Cis- and Trans- isomers are the geometrical isomers which have same chemical formula but different structural formula

According to CIP rule, the groups on the doubly bonded carbon atoms are given priorities based on the the atomic masses of first connected atom.

If the highest priority groups are on the same side, it is known as cis-form and if the highest priority groups are on opposite side, it is known as trans-form.

We are given a chemical compound, which is 2-pentene.

In this the highest priority groups are methyl and ethyl groups.

When the groups are on the same side, it forms cis-form and when the groups are on the opposite side, it forms trans-form

The structure of the geometrical isomers are attached below.

7 0
3 years ago
What are some benefits of eating apples??
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Apples are rich in fiber and antioxidants. Eating them is linked to a lower risk of many chronic conditions, including diabetes, heart disease, and cancer. Apples may also promote weight loss and improve gut and brain health.
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2 years ago
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What is the density of and object that is 100 grams and has a volume of 5 cubic centimeters?
lesya [120]

Explanation:

Density of object = gram/volume

= 100 g/ 5 cm³

= 20 g/cm³

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