Chapter 1 Practice Test Flashcards
How can the overlap of chemistry with biology be explained?
Biological molecules follow the same rules as other molecules, and therefore their study falls into the domains of both biology and chemistry.
Which of the following steps is not a part of the scientific method?
Formulate a theory based on a single observation
What is the term in the scientific method that summarizes the results of repeated observations regarding a given phenomenon without providing an explanation?
law
Suppose you do some simple experiments in Denver about cooking eggs. After several experiments you write the following statement: It takes longer to cook eggs because chickens at high altitudes lay eggs with thicker shells. This statement is an example of which of the following?
a hypothesis
Which of the following is not a postulate of Dalton’s atomic theory of matter?
Atoms can be reduced to protons, electrons and neutrons.
Which of the following describes the characteristics of matter in the gas phase?
The volume and the shape are not fixed.
What distinguishes a mixture from a pure substance?
A mixture is a combination of two or more substances that are physically separable, and a pure substance is not physically separable.
Calcium carbonate is a compound that can decompose into carbon dioxide and calcium oxide. Carbon dioxide, in turn, is made up of the elements carbon and oxygen. What needs to happen to a compound in order for it to be broken down into either elements or simpler compounds?
The compound needs to undergo a chemical reaction
Carbon dioxide bubbles can be found in many drinks, including sodas, some mineral waters, and beer. Which two phases of matter are present in drinks that contain carbon dioxide?
gas and liquid
Which of the following is not a mixture?
oxygen gas
The melting point of the metal gallium is 30°C. Normal body temperature is about 37°C. When a person holds a piece of gallium, it tends to melt. This is an example of what type of change?
a physical change
The odor of a solution is an example of what type of measurement?
qualitative
There are seven base SI units that were established as the international norm for all scientific endeavors. Since then, many derived units have been established. These are units that are combinations of the seven basic units. Which of the following choices is not a base SI unit?
liter
One kilogram is equal to about 2.20 pounds. Both kilograms and pounds are units of mass. What is the equivalent weight in pounds of a 37.5 kilogram object?
82.5 lb
Which of the following terms would represent one-thousandth of a liter?
milliliter