<span>When two atoms come near each other, sometimes they stick together to make a molecule. One way they can stick together is by covalent bonding.</span>
<span>In covalent bonding, the atoms are unstable because their outer rings of electrons aren't filled up. By sharing electrons with other atoms, these atoms can fill up their outer rings and become stable. In water, for instance, the oxygen atom needs two more electrons to be stable, and the hydrogen
atoms each need one. When they get together, the oxygen atom shares one
electron with each of the hydrogen atoms, and the hydrogen atoms each
share one electron with the oxygen atom.</span>
Now that the atoms have become stable, it's pretty hard to knock
them back into being unstable again, so covalent bonds are strong and
molecules that form with covalent (sharing) bonds are strong molecules.
<span>Covalent bonding makes very strong connections between the atoms,
so it's hard to break these molecules apart. On the other hand,
molecules that join with covalent bonds aren't very much attracted to
each other (unlike with ionic bonding), so they move freely around each
other. That means that most molecules that form covalent bonds make
either liquids or gases, like water and carbon dioxide. The main exception is metals,
which hold together using covalent bonding but are still solids. That's
why metals are so flexible and easy to melt so you can make them into
different shapes.</span>
The answer is steel because you cannot pick water, oxygen, or gold out of a mixture.
The reaction is a synthesis reaction.
<h3>What are synthesis reactions?</h3>
Synthesis reactions are one of the numerous reactions in chemistry. These kinds of reactions involve the combination of two atoms of different elements resulting in the formation of new compounds.
Synthesis reactions are sometimes referred to as combination reactions, simply because they have to do with the combination of two or more atoms of different elements into a single compound.
The different elements that combine are referred to as the reactants while the result of the combination is known as the product.
For example: A + B --> AB
In the illustrated reaction, N2 combined with H2 to form NH3. N2 and H2 gases are the reactants while NH3 is the only product formed from the two reactants.
This is a good example of a synthesis/combination reaction.
More on synthesis reactions can be found here: brainly.com/question/24936069
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Answer : The correct option is C.
Explanation :
Chemical change : It is defined as a change in which a new compounds are formed by the chemical reaction. Changes occurs in their chemical composition and properties.
The molecular structure of a substance changes in a chemical reaction is a chemical change.
- Change in molecular structure means that there is a breaking and formation of bonds in a molecule.
The example of chemical change in terms of change in molecular structure is the reaction of hydrogen with oxygen.
The reaction of hydrogen with oxygen is,
In this reaction, the H-H bond is break and O-H bond is form.
Answer:
Precipitation Reactions
They contain two aqueous reactants, one aqueous product, and one solid product. In this reaction, two soluble products, Pb(NO3)2 and KI, combine to form one soluble product, KNO3, and one insoluble product, PbI2. This is a precipitation reaction, and PbI2 is the precipitate.
