Intro to Chem Exam 1
How many milliliters are in 17.5 L?
1.75 x 10^4
Suppose a thermometer has marks at every one degree increment and the mercury level on the thermometer is exactly between the 25 and 26 degree Celsius marks. We should properly report the temperature measurement as:
25.5C
In the number 48.93, which digit is estimated?
3
The correct number of significant figures in the number 865,000 is:
3
The correct scientific notation for the number 500.0 is:
5.000 x 10^2
The correct scientific notation for the number 0.00050210 is:
5.0210 x 10^-4
The correct decimal representation of 6.453 x 103 is:
6,453
Which of the following items does NOT contain chemicals? -insecticides -organically grown vegetables -air -drain cleaner -All of the above contain chemicals.
All of the above contain chemicals
Which of the statements below is NOT part of the scientific method? -All of the above steps are part of the scientific method. -refinement of a hypothesis as needed -observation and measurement -testing of a hypothesis by experimentation -formation of a hypothesis
All of the above steps are part of the scientific method
Which statement about a hypothesis is TRUE? -It has the potential to be proven wrong. -It is a tentative interpretation or explanation. -It is part of the scientific method. -All of the above statements are true. -It can be tested by experiments.
All the statements above are true.
Who discovered the law of conservation of mass?
Antoine Lavoisier
Which of the following is an example of a scientific law? -Flammable objects contain phlogiston. -When a can of soda pop is opened, a fizzing sound is heard. -All matter is composed of small, indestructible particles called atoms. -none of the above -In a chemical reaction, matter is neither created nor destroyed.
In a chemical reaction, matter is neither created nor destroyed.
Who discovered the atomic theory?
John Dalton
The base SI unit for temperature is:
Kelvin.
Which type of energy is associated with motion?
Kinetic
What is the base SI unit for length?
Meter
Which statement about the scientific method is TRUE? -The scientific method emphasizes reason as the way to understand the world. -All of the above statements are false. -The scientific method emphasizes observation and experimentation as the way to understand the world. -The scientific method emphasizes scientific laws as the way to understand the world. -The scientific method emphasizes observation and reason as the way to understand the world.
The scientific method emphasizes observation and experimentation as the way to understand the world.
What is the definition of a scientific theory?
a model that explains the underlying reasons for observations and laws
The definition of a scientific law is: -the same as a hypothesis. -the underlying reason for a scientific theory. -none of the above -a number of similar observations generalized into a brief statement summarizing past observations and predicting new ones. -a way of learning that emphasizes observation and experimentation.
a number of similar observations generalized into a brief statement summarizing past observations and predicting new ones.
Which of the following items is a mixture? -brass -none of the above -sugar -water -helium
brass
If a particular process is endothermic, the reverse process must be a (an):
exothermic process
Which of the following items is a pure substance? seawater -air -ice -none of the above -brass
ice
There are exactly 2.54 centimeters in 1 inch. When using this conversion factor, how many significant figures are you limited to?
infinite number of significant figures
How would you classify salt water?
mixture-homogeneous
If you hold a solid piece of pure gallium metal in your hand, your body heat will melt the gallium into its liquid form. This illustrates which of the following? -distillation -physical change -chemical property -chemical change -none of the above
physical change
Which of the following is a heterogenous mixture? -none of the above -milk -sugar water -raisin bran -air
raisin bran
Which of the following items is a physical property? -the corrosive action of acid rain on granite -none of the above -the odor of spearmint gum -the tarnishing of a copper statue -the combustion of gasoline
the odor of spearmint gum
A good definition of chemistry is: -the science that seeks to understand what the universe does by studying interactions of molecules with atoms. -none of the above -the science that seeks to understand what living organisms do by studying the molecules that make up the organism. -the science that seeks to understand what matter does by studying what atoms and molecules do. -the science that seeks to understand the interactions of molecules for the sake of advancing human control over nature.
the science that seeks to understand what matter does by studying what atoms and molecules do.
Which of the following items is a chemical property? -none of the above -the paint color on a new red Corvette -the melting and boiling point of water -the tarnishing of a copper statue -the odor of spearmint gum
the tarnishing of a copper statue
Physical properties are:
those that a substance displays without changing its composition.
