Question 1

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

Question 2

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 
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 3

Oxygen atoms are used to make water molecules. Does this mean that oxygen, O₂, and water, H2O, have similar properties?

Accepted Answer

A) Yes, and this explains how fish are able to breathe water. 
B) Yes, but that their properties are similar is only a coincidence. 
C) No, but their similar properties are only a coincidence. 
D) No, compounds are uniquely different from the elements from which they're made. 
A) Yes, and this explains how fish are able to breathe water. 
B) Yes, but that their properties are similar is only a coincidence. 
C) No, but their similar properties are only a coincidence. 
D) No, compounds are uniquely different from the elements from which they're made.

Question 4

Conducts electricity.

Accepted Answer

The answer of Conducts electricity....

Question 5

Can be made into thin sheets.

Accepted Answer

The answer of Can be made into thin sheets....

Question 6

If you have one molecule of TiO₂, how many molecules of O₂ does it contain?

Accepted Answer

A) None, O₂ is a different molecule than TiO₂. 
B) One, TiO₂ is a mixture of Ti and O₂. 
C) Two, TiO₂ is a mixture of Ti and 2 O. 
D) Three, TiO₂ contains three molecules. 
E) none of the above 
A) None, O₂ is a different molecule than TiO₂. 
B) One, TiO₂ is a mixture of Ti and O₂. 
C) Two, TiO₂ is a mixture of Ti and 2 O. 
D) Three, TiO₂ contains three molecules. 
E) none of the above

Question 7

If you have two molecules of TiO₂, how many oxygen atoms would you have?

Accepted Answer

A) 4 
B) 2 
C) 3 
D) 6 
E) none 
A) 4 
B) 2 
C) 3 
D) 6 
E) none

Question 8

Which of the following would be considered a physical property?

Accepted Answer

A) density 
B) flammability 
C) corrosion resistance 
D) reactivity towards acid 
E) oxygen sensitivity 
A) density 
B) flammability 
C) corrosion resistance 
D) reactivity towards acid 
E) oxygen sensitivity

Question 9

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 
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 10

Which has stronger attractions among its submicroscopic particles: a solid at 25°C or a gas at 25°C?

Accepted Answer

A) The attractions among the submicroscopic particles of the solid must be stronger than the attractions among the particles of the gas. 
B) The submicroscopic particles of the gas are moving faster. This means that they have more energy, which means that the attractions among them must be stronger. 
C) The attractions among the submicroscopic particles of the solid are much stronger-so much stronger that they hold the particles of the solid absolutely still. 
D) The temperatures of these two materials are the same, which means that the attractions among their submicroscopic particles are also of the same strength. 
A) The attractions among the submicroscopic particles of the solid must be stronger than the attractions among the particles of the gas. 
B) The submicroscopic particles of the gas are moving faster. This means that they have more energy, which means that the attractions among them must be stronger. 
C) The attractions among the submicroscopic particles of the solid are much stronger-so much stronger that they hold the particles of the solid absolutely still. 
D) The temperatures of these two materials are the same, which means that the attractions among their submicroscopic particles are also of the same strength.

Question 11

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. 
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 12

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. 
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 13

Steam burns are more damaging than burns caused by boiling water because steam

Accepted Answer

A) gives up additional energy when it condenses. 
B) has more energy per kilogram than boiling water. 
C) both A and B 
D) neither A nor B 
A) gives up additional energy when it condenses. 
B) has more energy per kilogram than boiling water. 
C) both A and B 
D) neither A nor B

Question 14

When heat is added to boiling water, water temperature

Accepted Answer

A) increases. 
B) decreases. 
C) stays the same. 
A) increases. 
B) decreases. 
C) stays the same.

Question 15

Chemistry is the study of

Accepted Answer

A) matter. 
B) transformations of matter. 
C) only microscopic phenomena. 
D) only macroscopic phenomena. 
E) both A and B 
A) matter. 
B) transformations of matter. 
C) only microscopic phenomena. 
D) only macroscopic phenomena. 
E) both A and B

Question 16

Which of the following would be considered basic research?

Accepted Answer

A) examining why a mouse likes cheddar cheese more than swiss cheese 
B) studying ways of catching mice safely 
C) testing the strength of a mouse cage 
D) examining how quickly a trapdoor closes 
E) testing a safe, nontoxic mouse glue 
A) examining why a mouse likes cheddar cheese more than swiss cheese 
B) studying ways of catching mice safely 
C) testing the strength of a mouse cage 
D) examining how quickly a trapdoor closes 
E) testing a safe, nontoxic mouse glue

Question 17

Each night you measure your height just before going to bed. When you arise each morning, you measure your height again and consistently find that you are 1 inch taller than you were the night before but only as tall as you were 24 hours ago! Is what happens to your body in this instance best described as a physical change or a chemical change?

Accepted Answer

A) chemical change because it involves your body 
B) physical change because it readily reverses 
C) chemical change because it involves changes in your bone structure 
D) physical change because water expands as it freezes 
A) chemical change because it involves your body 
B) physical change because it readily reverses 
C) chemical change because it involves changes in your bone structure 
D) physical change because water expands as it freezes

Question 18

Which of the following is an example of a physical change?

Accepted Answer

A) water boiling and being converted into steam 
B) water being electrolyzed and being converted in hydrogen and oxygen 
C) iron metal reacting with oxygen to form rust 
D) a candy bar being digested by a student 
E) charcoal being converted into ash 
A) water boiling and being converted into steam 
B) water being electrolyzed and being converted in hydrogen and oxygen 
C) iron metal reacting with oxygen to form rust 
D) a candy bar being digested by a student 
E) charcoal being converted into ash

Question 19

Why is chemistry described as the "central science"?

Accepted Answer

Chemistry is founded on the principles o

Question 20

An example of basic research is

Accepted Answer

A) the development of new plastics that can be recycled. 
B) the study of the relationship between the amount of automobile emissions gases in the atmosphere and the decomposition of atmospheric ozone. 
C) the study of the composition of the atom. 
D) the design of new batteries for electric cars. 
E) the study of natural compounds in sea animals to look for new molecules that can be used for medicine. 
A) the development of new plastics that can be recycled. 
B) the study of the relationship between the amount of automobile emissions gases in the atmosphere and the decomposition of atmospheric ozone. 
C) the study of the composition of the atom. 
D) the design of new batteries for electric cars. 
E) the study of natural compounds in sea animals to look for new molecules that can be used for medicine.

Exam 11: Investigating Matter

The following image describes which type of change?

Which of the following is not a chemical change?

Oxygen atoms are used to make water molecules. Does this mean that oxygen, O₂, and water, H2O, have similar properties?

Conducts electricity.

Can be made into thin sheets.

If you have one molecule of TiO₂, how many molecules of O₂ does it contain?

If you have two molecules of TiO₂, how many oxygen atoms would you have?

Which of the following would be considered a physical property?

Which of the following would be considered applied research?

Which has stronger attractions among its submicroscopic particles: a solid at 25°C or a gas at 25°C?

Nanotechnology looks at working with particles the size of

Nanoscience has shown that

Steam burns are more damaging than burns caused by boiling water because steam

When heat is added to boiling water, water temperature

Chemistry is the study of

Which of the following would be considered basic research?

Which of the following is an example of a physical change?

Why is chemistry described as the "central science"?

An example of basic research is

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Oxygen atoms are used to make water molecules. Does this mean that oxygen, O₂, and water, H₂O, have similar properties?