Chemistry Exam 1 - ch 1
Give an example of an intensive property
Temperature, density, melting point, boiling point
Burning wood in a fireplace is a __________ change.
chemical
What is a substance composed of atoms of two or more elements chemically united in fixed proportions?
compound
____________ is a substance composed of atoms of two or more elements chemically united in fixed proportions.
compound
What is a substance that cannot be separated into simpler substances by chemical means?
element
Which of the following cannot be separated into a simpler substance by chemical means?
element
__________ is a substance that cannot be separated into simpler substances by chemical means.
element
77 K is colder than 4 K.
false
A dip of vanilla ice cream is a pure substance
false
A particular temperature in degrees Celsius is larger than the temperature in Kelvin.
false
Boiling point and melting point are extensive properties
false
Rusting of a piece of iron under environmental conditions is a physical change
false
The ripening of fruit, once picked, is an example of physical change.
false
The volume of a substance is an intensive property
false
When applying the scientific method, it is important to avoid any form of hypothesis.
false
Which of the following is not an S.I. base unit?
gram
Which of the following does not have a uniform composition throughout?
heterogeneous mixture
If a liquid contains 60% sugar and 40% water throughout its composition then what is it called?
homogeneous mixture
Which of the following activities is not a part of good science?
indulging in speculation
When the value of something does not depend on the amount of the matter then what is this called
intensive property
The S.I. base unit of mass is
kg
What is term used for findings that are summarized based on a pattern or trend?
law
Which of the following is an extensive property of oxygen?
mass
What is the equation used to calculate the mass from the density?
mass = density x volume or m = dv
What is a combination of two or more substances in which the substances retain their distinct identities?
mixture
__________ is a combination of two or more substances in which the substances retain their distinct identities.
mixture
tells how closely multiple measurements of the same thing are to one another.
precision
What is something that has a definite composition?
pure substance
__________ is something that has a definite composition.
pure substance
What is a unifying principle that explains a body of experimental observations?
theory
Matter is anything that has mass and occupies space
true
The density of a substance is an intensive property
true
The juice from an orange is a mixture.
true
The number 6.0448, rounded to 3 decimal places, becomes 6.045.
true
When applying the scientific method, a model or theory should be based on experimental data.
true
Zero Kelvin < 0° Fahrenheit < 0° Celsius
true
Which one of the following is a "substance" in the sense of the word as used in your textbook?
water
What is the equation for the conversion of °Celsius to Kelvin?
°C + 273.15 = Kelvin
The distance between carbon atoms in ethylene is 134 picometers. Which of the following expresses that distance in meters?
1.34 x 10^-10 m
The SI prefixes milli and mega represent, respectively
10- 3 and 106
The S.I. prefix mega- (M) means
10^6
A dose of medication was prescribed to be 35 microliters. Which of the following expresses that volume in centiliters?
3.5 x 10-3 cL
How many milliliters is 0.0055 L?
5.5 mL
How many hertz is 600.11 MHz?
6.0011 x 108 Hz
How many micrograms are in 65.3kg?
6.53 x 10^10 microg
Which of the following is a chemical change?
Broiling a steak on a grill
Identify this process as a physical or chemical change: Bacteria converts milk to yogurt.
Chemical
___________ is the term used to indicate a measurement is accurate. (Hint: Often used when measurement the volume of a liquid.)
Graduated or Calibrated
What is defined as a tentative explanation for observations that are made that result in the formulation of this concept?
Hypothesis
Which of these is an example of a physical property
Lead becomes a liquid when heated to 601°C
Which of the following is an extensive property?
Mass
Give an example of an extensive property.
Mass, length, and volume
Which one of these represents a chemical change?
Turning hair yellow with bleach
Which one of these represents a physical change?
Water, when heated, forms steam
tells how close a measurement is to the true value.
accuracy