Physical Science Chapter 21

To say a chemical equation is balanced means the

Number of times each element appears as a reactant is equal to the number of times it appears as a product

During a chemical reaction

Old atoms stick around merely switching

Gases are so much easier to squeeze into smaller volumes than liquids or solids because

There is so much space in between the submicroscopic particles

Chemical and physical changes are similar in that they both involve

Two of the above are correct

The above transformation from left to right is best viewed as a

Chemical change because the atoms are connected differently in each box

How does the solid phase differ from a liquid phase on the molecular level

The molecules of a solid are fixed, while the molecules of a liquid are mobile

Growth in a living body is best considered an example of a

Two of the above are correct

Chemistry is the study of the

All three of these with emphasis on the submicroscopic

What is the difference between an element and a chemical compound?

An element consists of only one type of atom

A physical change is best represented by the transformation of box X into box

Box A

Each circle in the above boxes represent an atom of the same element. The transformation from left to right is best viewed as a

Chemical change because the atoms are connected differently in each box

Compared to chemical changes physical changes typically

Less energy and reversibility

When two different elements combine to form a compound, the resulting properties of the compound are

Not necessarily anything like those of the elements

A solid is not considered a fluid

It's atoms or molecules are bound as close together as possible

The circles in the box as shown above represent in the submicroscopic particles of a material and its 3 face. From left to right these are

Liquid solid and gas.