Chapter 1 Flashcards
Molecules can be described as
two or more atoms chemically joined together.
A scientific theory
is based on continued observation and experiment
Identify a liquid
definite volume and no definite shape
Which of the following statements about crystalline and amorphous solids is TRUE?
A crystalline solid is composed of atoms or molecules arranged with long-range repeating
order.
Which of the following statements about the phases of matter is TRUE?
In both solids and liquids, the atoms or molecules pack closely to one another
A substance that can’t be chemically broken down into simpler substances is
an element
A substance composed of two or more elements in a fixed, definite proportion is
a compound
Two or more substances in variable proportions, where the composition is constant throughout are
a homogeneous mixture
Two or more substances in variable proportions, where the composition is variable throughout are
a heterogeneous mixture
A physical change
occurs when water is evaporated.
A chemical change
occurs when methane gas is burned
Which of the following statements about energy is FALSE?
Kinetic energy is the energy associated with its position or composition
Define thermal energy
energy associated with the temperature of an object
Define kinetic energy
energy associated with the motion of an object
Define potential energy
energy associated with the position or composition of an object
The outside temperature is 35°C. What is the temperature in K?
308 K
Determine the density of an object that has a mass of 149.8 g and displaces 12.1 mL of water when placed in a graduated cylinder
12.4 g/mL
Determine the volume of an object that has a mass of 455.6 g and a density of 19.3 g/cm3
23.6 mL
Which of the following statements about the phases of matter is TRUE?
In both solids and liquids, the atoms or molecules pack closely to one another
A substance that can’t be chemically broken down into simpler substances is
an element
A substance composed of two or more elements in a fixed, definite proportion is
a compound
Identify a solid
definite volume and definite shape
Identify a gas
no definite shape and no definite volume
The statement, “In a chemical reaction, matter is neither created nor destroyed” is called
the Law of Conservation of Mass
What answer should be reported, with the correct number of significant figures, for the following calculation? (433.621 - 333.9) × 11.900
1.19 × 10^3
What answer should be reported, with the correct number of significant figures, for the following calculation? (249.362 + 41) / 63.498
4.57
What answer should be reported, with the correct number of significant figures, for the following calculation? (965.43 × 3.911) + 9413.4136
13189
