Question

1. many elements that are essential for life include nitrogen, oxygen, and carbon. how are they classified?

a. nonmetals
b. metals
c. metalloid
d. none

1. the rows going across the periodic table of elements are called

a. group
b. elements
c. period
d. none

1. which of the following is not a property of metals?

a. are found on the right side of the periodic table.
b. are found on the left side of the periodic table.
c. are good conductors of heat and electricity.
d. are malleable and ductile.

1. what does the law of conservation of mass state?

a. matter cannot be created or destroyed in a chemical reaction.
b. matter can only be destroyed in a chemical reaction.
c. matter can only be created in a chemical reaction.
d. matter can be created and destroyed in a chemical reaction.

1. how many atoms of carbon (c) are in c₆h₁₂o₆?

a. 3
b. 6
c. 12
d. 24

1. how many hcl molecules do you need to balance this equation?

mg + __hcl ---> mgcl₂ + h₂
a. 1
b. 4
c. 3
d. 2

1. which type of chemical reaction has two or more reactants to make one product?

a. combustion
b. single displacement
c. decomposition
d. synthesis

Explanation:

Question 42

Nitrogen, oxygen, and carbon are nonmetals. Nonmetals are elements that lack the properties of metals, and these three elements fit the classification of nonmetals. Metals are typically good conductors, malleable, etc., and metalloids have properties between metals and nonmetals, which these elements do not have.

In the periodic table, the horizontal rows are called periods, and the vertical columns are called groups. Elements are the individual substances, so the rows are periods.

Metals are generally found on the left side of the periodic table, are good conductors of heat and electricity, and are malleable and ductile. Nonmetals are on the right side, so the statement that metals are found on the right side is not a property of metals.

Answer:

A. Nonmetals

Question 43