Vocabulary
the mass per unit of a substance
What is density?
If some of the milk from a pitcher was poured into a glass, the milk in the pitcher and the milk in the glass would have the same ____________.
What is density?
Is boiling point a characteristic property?
What is yes?
What happens to a substance when the molecules lose so much energy that they can only vibrate and become completely subject to cohesion?
What is Freezing?
Water must travel from the roots of a plant to all other parts. What properties of water allow it to move in opposition to gravity?
What is cohesion, adhesion, and surface tension?
a liquid’s resistance to flow
What is viscosity?
A gas in a balloon has a definite _____ even when the temperature changes.
What is mass?
How is the motion of molecules in a liquid different from the motion of molecules in a gas?
The molecules in a liquid have enough energy to overcome some cohesive force, but not all of it. They can move some. The molecules in a gas have more energy than those in a liquid, so they can overcome cohesion and move about freely
the amount of matter in an object
What is mass?
According to Boyle’s law, when the pressure on a gas increases, _____________.
What is the volume increases?
changing of a liquid to gas
What is Evaporation?
If you were to land on Mars, why would your weight change but not your mass?
Weight measures gravitational force on an object, and mass measures the amount of matter. There is less gravitational force on Mars so I would weigh less, but the amount of matter in my body would stay the same
the attractive force between unlike substances that holds them together
What is adhesion?
What type of substance has a specific pattern of atoms and a specific melting point?
What is a crystalline solid?
the changing of a substance from a gas to a liquid
What is Condensation
Why is a rubber hose less flexible when it is cold than when it is warm?
When the hose is cold, the molecules have less energy so they move less, making the hose more rigid. When the molecules are warm, they have more energy so they move more. This makes the hose more flexible.
the amount of force exerted on an object per unit of area
What is pressure?
What is the law of conservation of mass?
What is matter cannot be created or destroyed?
changing of a substance from a solid directly to a gas
What is Sublimation?
If baking soda and vinegar react to make carbon dioxide gas, is there less matter when the reaction is done? Why?
No, because the law of conservation of mass states that matter can neither be created nor destroyed. There may be less matter in the container, but the molecules have regrouped in the chemical change and are now in the air.