Why did the mass of the closed balloon-bottle system stay the same?

A student has one liter of cotton and one liter of copper pennies. Which statement best compares the masses of the two samples?

Which of the following substances can be separated into several elements?

Sugar is composed of carbon, hydrogen, and oxygen. Sugar is an example of which of the following?

Which of the following is the smallest form of matter?

When 1 gram of water is evaporated in a sealed container, the volume of the water vapor increases but the mass remains constant. Why?

Which statement is true about Conservation of Mass?

Which of the following equations is balanced?

Which of the following equations is balanced?

How many molecules are in the compound sodium carbonate 3Na2CO3?

How many different atoms are in the compound sodium carbonate (Na2CO3)?

How many different elements are in the compound sodium carbonate (Na2CO3)?

Which of the following is formed when two or more different elements combine chemically?

Which statement best explains what happens to the atoms in gold (Au) when the temperature of the metal is increased?

Which statement best describes what happens to the motion of the water molecules after heat is added?

How does increasing heat energy affect hydrochloric acid (HCl) molecules?

Which of the following substances would keep the same volume but different shape if they were moved from a rectangular container to a round shaped container?

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