Intro to Chem Flashcards
A theory is an explanation of a law that has been accepted as true by the scientific community, whereas a law is a summary of many observations.
True
What is a unifying principle that explains a body of experimental observations?
Theory
When applying the scientific method, it is important to avoid any form of hypothesis
False
The SI prefixes milli and mega represent, respectively:
10^-3 and 10^6
If a liquid contains 60% sugar and 40% water throughout its composition then what is it called?
homogeneous mixture
Which of the following is a chemical change?
broiling a steak on a grill
Which of the following activities is not a part of good science?
indulging in speculation
The ripening of fruit, once picked, is an example of physical change
false
Which of these is an example of a physical property?
lead becoming a liquid when heated to 601°C
Which of the following cannot be separated into a simpler substance by chemical means?
element
When applying the scientific method, it is important to avoid any form of hypothesis
false
Which one of these represents a physical change?
water, when heated, forms steam
Which one of these represents a chemical change?
turning hair yellow with bleach
Matter is anything that has mass and occupies space
true
Which of the following cannot be separated into a simpler substance by chemical means?
element
