Test Three Exam Flashcards
(42 cards)
What are the smallest particles into which an element may be broken down without changing the identity of the element?
Atoms
What does 1 millimeter of mercury (1 mmHg) equal?
1 torr
What is the number of protons in an atom?
Atomic number
What does the standard atmosphere (atm) equal?
760 torr
What isotope is the atomic mass unit defined relative to?
Carbon-12
Which step of the scientific method involves thinking about nature to develop an idea about how something works?
Hypothesizing
What is a microsecond?
10-6 s
What is the standard temperature and pressure (STP)?
273.15 K and 769 torr
How many atoms are in exactly one mole of arms?
6.022#10-23
What temperature equals 0K
-273.15C
What is the instrument used to measure atmospheric pressure?
Barometer
What is the amount of force exerted upon a surface per unit of area?
Pressure
In what state of matter do particles have enough energy to move freely but not enough energy to overcome their attraction for each Other?
Liquid
How closely a measured value matches the actual value is called what?
Accuracy
The dense central portion of an atom is called?
Nucleus
The link between the microscopic and macroscopic levels of chemistry is?
Avogadro’s number
Which law implies that, at constant temperature and pressure, the molar volume of an ideal gas is constant?
Avogadros law
When food coloring dye is dropped into water, the dye spreads throughout the water until they are evenly mixed. Name the molecular process that causes the dye and water to mix.
Diffusion
What quantity is the ratio of mass to volume?
Density
The branch of science that deals with the study of the composition
Chemistry
What are the three main steps to the scientific method?
Observing
Hypothesizing
Experimenting
Once a hypothesis has been supported by many experiments and verified by other scientist it is considered what?
A theory
What is a theory that has stood the test of time?
A scientific law
Known as “the language of science”
Mathematics
