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3 years ago

Can you please help on 17 and 18 pleaseeee

Chemistry

1 answer:

nadezda [96]3 years ago

6 0

Answer:

17. Yes, it represents a chemical reaction. This is because new substances were formed from the original substance.

18. (a) Formation of new substances

(b) Evolution or absorption of large quantity of heat

(c)Change in mass of substances

Explanation:

17. In the model above, molecules of a compound of carbon and hydrogen (molecular formula is C2H6) combines with molecular oxygen (O2) to produce two new substances; a compound composed of two oxygen atoms and one carbon atom (CO2) and another compound composed of two atoms of hydrogen and one atom of oxygen (H2O). Since the new substances formed are completely different from the original substances, it a chemical reaction. Also, a large volume of heat would have been given off.

18. To determine if a chemical reaction has occurred, the following observations can be looked out for.

a. Formation of new substances different entirely from the original substances

b. Evolution or absorption of large quantity of heat during the change. Check whether the vessel containing the substances gets hotter or colder.

c. Change in mass of substances. Since new substances are formed in a chemical reaction, there is usually a significant change in mass of the products and reactants.

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Model B: In this model the atom is a solid sphere that cannot be divided up into smaller

vivado [14]

Answer:

They are called corpuscles

Explanation:

5 0

3 years ago

Each of the following names is wrong. Draw structures based on them, and correct the names:(b) 1,1,1-trimethylheptane

devlian [24]

The correct IUPAC name of 1,1,1-trimethylheptane is 2,2-dimethyloctane.

<h3>IUPAC NAME:</h3>

It is systematic way of nomenclature of organic compounds.

It is based on the position of functional groups, preference of the functional group, long or short chain of carbon, preference of double bond, single and triple bond, branching of carbon chain, etc.

The given compound is 1,1,1-trimethylheptane.

The given name is wrong according to IUPAC name because the numbering of carbon atom should be done in that way in which the carbon atom chain is largest.

Here, in this case the numbering is done from right side. Thus the largest carbon chain have 8 carbon atom.

If the numbering is done according to the question, number of carbon atom in straight chain is 7.

Thus, we concluded that the Correct IUPAC name of 1,1,1-trimethylheptane is 2,2-dimethyloctane.

learn more about Nomenclature:

brainly.com/question/14094007

#SPJ4

5 0

2 years ago

Calcium has an atomic number of 20. How many electrons does calcium lose when forming an ionic bond with another ion?

oksano4ka [1.4K]

2 electrons. it has electron configuration of 2.8.8.2 hence the last 2 will be lost for it to gain stable.
if you need more explanation on periodic table you can reach me at [email protected]

5 0

3 years ago

In an atom, the number of neutrons determines most specifically the ________.

lord [1]

In an atom, the number of neutrons determines most specifically the isotopes of an element.

<h2>Further Explanation</h2><h3>An atom </h3>

An atom is defined as the smallest particle of an element that can take part in a chemical reaction.
Atoms are made of energy shells and the inner nucleus.
It is also made up of subatomic particles, protons and neutrons.

<h3>Neutrons </h3>

They are sub-atomic particles in an atom that are found in the nucleus of an atom. They have a zero charge or no charge.
Neutrons are slightly heavier than protons.
The number of protons and neutrons in a nucleus of an atom results to the atomic mass number of an atom. Like protons they only take part in nuclear reactions.

<h3>Protons</h3>

Protons are subatomic particles that are found in the nucleus of an atom. They are positively charged. with a charge of +1.
The number of protons differ from one element to another and thus used as the atomic number of an individual element.
The nucleus of an atom is positively charged due to the positive charge of the protons.
Additionally, protons do not take part in chemical reactions but in nuclear reactions.

<h3>Electrons </h3>

They are found orbiting the nucleus on energy shells based on Clouds’ theory. Electrons are negatively charged each with a charge of -1.
The number of electrons and protons in a neutral atom are equal. Additionally they have the least mass of the three sub-atomic particles.
Electrons are the only sub-atomic particles that take part in chemical reactions.

<h3>Isotopes </h3>

Isotopes are atoms of the same element that have the same mass number but different atomic number.

<h3>Mass number;</h3>

Mass number is the sum of the number of protons and neutrons in the nucleus of an atom of an element.

Keywords: Atom, sub-atomic particles, electrons, protons, neutrons, isotopes

<h3>Learn more about:</h3>

Sub-atomic particles: brainly.com/question/12762384
Electrons: brainly.com/question/1264222
Protons: brainly.com/question/1264222
Neutrons: brainly.com/question/1264222
Mass number: brainly.com/question/2152789
Atomic number: brainly.com/question/8100107

Level: High school

Subject: Chemistry

Topic: Atomic structure

4 0

3 years ago

Read 2 more answers

Van der Waals bonds initiate

brilliants [131]

I think e no

I am giving you hint

7 0

2 years ago