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.