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Students placed a balloon with air in the freezer for several hours. What will they observe when they take the balloon out?
Gas
Gold atoms
They help prevent cracking when the cement is heated
Several hundred years as many scientists worked on it.
Compound
The balloon had shrunk
Moved fast enough to escape the liquid
It has most of its mass in the center
What is a pure lump of elemental gold made of?
Gas
Gold atoms
They help prevent cracking when the cement is heated
Several hundred years as many scientists worked on it.
Compound
The balloon had shrunk
Moved fast enough to escape the liquid
It has most of its mass in the center
An understanding of the structure of an atom has been developed. How much time did it take to do?
Gas
Gold atoms
They help prevent cracking when the cement is heated
Several hundred years as many scientists worked on it.
Compound
The balloon had shrunk
Moved fast enough to escape the liquid
It has most of its mass in the center
What do scientists call a substance that is made of two or more elements?
Gas
Gold atoms
They help prevent cracking when the cement is heated
Several hundred years as many scientists worked on it.
Compound
The balloon had shrunk
Moved fast enough to escape the liquid
It has most of its mass in the center
Early chemists thought the parts of the atom were spread evenly throughout the atom. How has the model changed? We now know
Gas
Gold atoms
They help prevent cracking when the cement is heated
Several hundred years as many scientists worked on it.
Compound
The balloon had shrunk
Moved fast enough to escape the liquid
It has most of its mass in the center
An increase in temperature of a liquid causes it to change to which phase?
Gas
Gold atoms
They help prevent cracking when the cement is heated
Several hundred years as many scientists worked on it.
Compound
The balloon had shrunk
Moved fast enough to escape the liquid
It has most of its mass in the center
What happens to molecules of a liquid when it turns to gas? The molecules have:
Gas
Gold atoms
They help prevent cracking when the cement is heated
Several hundred years as many scientists worked on it.
Compound
The balloon had shrunk
Moved fast enough to escape the liquid
It has most of its mass in the center
Sidewalks have cracks that are imprinted every meter or two. What is the purpose of these cracks?
Gas
Gold atoms
They help prevent cracking when the cement is heated
Several hundred years as many scientists worked on it.
Compound
The balloon had shrunk
Moved fast enough to escape the liquid
It has most of its mass in the center
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