1. in a compound, which type of bond is the sharing of electrons between adjacent atoms?

a. nuclear bond
b. electric bond
c. chemical bond
d. hydrogen bond

2. two compounds are mixed and light is emitted, the color changes, and heat is liberated.

which activity has occurred?

a. chemical reaction
b. chemical mixture
c. chemical nucleus exchange
d. chemical compromise

3. which sodium reacts with chlorine to make sodium chloride (table salt), which term applies to sodium chloride?

a. reactant
b. mixture
c. evaporate
d. product

4. which name is given to a reaction in which the number of each atom on one side of the equation is equal to the number of the same kind of atoms on the other side of the equation?

a. complete
b. atomic
c. balanced
d. electrical

5. in the reaction na + ci - - - > naci, which statement indicates whether the equation is balanced?

a. visual evidence is necessary to determine the balance of the reaction
b. atoms of the same kind are of equal number on either side of the arrow
c. atoms of the same kind are not of equal number on either side of the arrow
d. evidence of the heat reaction is necessary to tell whether the equation is balanced.

1. C.

2. A.

3. D.

4. C.

5. B.

Explanation:

1. A compound is formed when two or more atoms are put together through a chemical bond. When atoms share electrons, the type of chemical bond is called a covalent bond.

2. Characteristics of a chemical reaction is the emission of light, production of heat, and change in color of the substance. However, it should be noted that a change in color does not always mean that a chemical reaction occurred, but generally, it is common.

3. The scenario given is a chemical reaction. In a chemical reaction, there are reactants and product. When the reactants "react", they produce a product. In this case, the product is Sodium chloride.

4. According to the law of conservation of mass, in a chemical reaction, the mass of the reactants should be equal to the mass of the product. This means that the amount of atoms of each element put into a chemical reaction, should produce the same amount of each element. This is what we call a balanced equation.

5. Given the reaction, we can tell that there are the same number of atoms of each element in the reactant side and on the product side. Let's break it down:

Reactant            Product

Na + Cl        →        NaCl

Na = 1                 Na = 1

Cl = 1                  Cl = 1

Because they are equal in number, the equation is balanced.

they include patterns; cause and effect; scale, proportion, and quantity; systems and system models; energy and matter; structure and function; and stability and change.

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