Question 1

Nanoscience has shown that

Accepted Answer

A) a chemical occurs with the use of a scanning probe microscope. 
B) the properties of a material can be different on the level of atoms then its properties when the material is analyzed in bulk. 
C) a physical change can occur when using a scanning probe microscope. 
D) DNA is the smallest molecule.

Question 2

The systematic names for water,ammonia,and methane are dihydrogen monoxide, H2 O; trihydrogen nitride,NH3 ; and tetrahydrogen carbide,CH4 .Why do most people,including chemists,prefer to use the common names for these compounds?

Accepted Answer

A) The common names are shorter and easier to pronounce. 
B) These compounds are encountered frequently. 
C) The common names are more widely known. 
D) all of the above

Question 3

Which of the following would not be considered a chemical property?

Accepted Answer

A) the temperature at which a liquid will boil 
B) light sensitivity 
C) whether a metal will rust or not 
D) whether a material will dissolve in acid or not 
E) the tendency of a material to explode

Question 4

Nanotechnology looks at working with particles the size of

Accepted Answer

A) 100 microns or larger. 
B) 1 to 100 nanometers,the realm of individual atoms and molecules. 
C) 50 grams and smaller. 
D) infinitesimally small,the size of electrons.

Question 5

Which of the following is not a chemical change?

Accepted Answer

A) a rock being crushed to powder 
B) grass growing 
C) grape juice turning into wine 
D) a loaf of bread growing mold 
E) wood burning to ash

Question 6

A chemical change results in

Accepted Answer

A) new atoms. 
B) a physical change. 
C) new materials. 
D) a new phase.

Question 7

Is the following transformation representative of a physical change or a chemical change?

Accepted Answer

A) chemical change because of the formation of elements 
B) physical change because a new material has been formed 
C) chemical change because the atoms are connected differently 
D) physical change because of a change in phase

Question 8

Nanotechnology and microtechnology are similar in that they both

Accepted Answer

A) are interdisciplinary. 
B) have huge impacts on society. 
C) are relatively new technologies. 
D) all of the above

Question 9

Some products on the market today involving nanotechnology include

Accepted Answer

A) cars. 
B) elevators. 
C) sunscreen. 
D) cosmetics. 
E) all of the above

Question 10

Which of the following would be considered applied research?

Accepted Answer

A) determining the lightest and strongest metal to be used for an airplane wing 
B) testing the strength of a piece of metal 
C) determining the melting temperature of a metal 
D) examining how susceptible a metal is to bending 
E) determining how readily a metal corrodes in a wet environment

Question 11

Oxygen, O2 ,is certainly good for you.Does it follow that if small amounts of oxygen are good for you then large amounts of oxygen would be especially good for you?

Accepted Answer

A) Yes.This is the reason patients are given pure (100%)oxygen during medical procedures. 
B) Yes.Increased oxygenation of the bloodstream is good for you and can increase your life span. 
C) No.Breathing 100% oxygen for extended periods of time can be damaging to the body. 
D) No.Large amounts of oxygen will absorb hydrogen from the body and increase the amount of water in the body causing an imbalance in electrolytes.

Question 12

A TV screen looked at from a distance appears as a smooth continuous flow of images.Up close,however,we see this is an illusion.What really exists are a series of tiny dots (pixels).This is similar to a chemist's view of matter in that

Accepted Answer

A) the fundamental particles of matter can also be seen when looked at closely with a magnifying glass. 
B) on the submicroscopic level,chemist's find that matter is made of extremely small particles,such as atoms and molecules. 
C) anything that a chemist can see,touch,hear,smell,or taste is an illusion. 
D) elements are made up of only three basic types of matter.

Question 13

A skillet is lined with a thin layer of cooking oil followed by a layer of unpopped popcorn kernels.Upon heating the kernels all pop thereby escaping the skillet.Which of the following physical and/or chemical changes occurred?

Accepted Answer

A) The water within each kernel is heated to the point that it would turn into water vapor as the kernels popped (physical change). 
B) The starches within the kernels are cooked by the high temperatures (chemical change). 
C) Both A and B occur. 
D) Physical and chemical changes cannot occur without a real chemical reaction taking place.

Question 14

Molecular oxygen,O2,and ozone,O3,are both examples of

Accepted Answer

A) atoms. 
B) elements. 
C) compounds. 
D) mixtures.

Question 15

A chemical change involves the formation or breaking of

Accepted Answer

A) an atom. 
B) the phase of the material. 
C) a chemical bond. 
D) all of the above

Question 16

What is the name of the following compound? NaF

Accepted Answer

A) sodium fluoride 
B) natural fosfate 
C) natrium fluoride 
D) nitrogen afleck 
E) sodium phosphide

Question 17

The following image describes which type of change?

Accepted Answer

A) a physical change 
B) a chemical change 
C) an elemental change 
D) a change in reactivity 
E) no change

Question 18

How would you describe the size of the following object? a blood cell

Accepted Answer

A) microscopic 
B) macroscopic 
C) submicroscopic 
D) all of the above 
E) none of the above

Question 19

There are about

Accepted Answer

A) 10 different types of atoms. 
B) 100 different types of atoms. 
C) a thousand different types of atoms. 
D) an unlimited number of different types of atoms.

Question 20