Density
Buoyancy
Phase Changes
Solids, Liquids, & Gases
Problem Solving
100
The relationship between the mass and volume of an object is its ______.
What is density?
100
The lifting force that causes an object to float is known as ___________.
What is buoyancy?
100
The temperature at which a solid changes to a liquid is called __________.
What is melting point?
100
A ______ is a form of matter that includes both liquids and gases.
What is fluid?
100
The volume of water in a graduated cylinder is 58 mL. After a small rock is placed in the cylinder, the volume increases to 72 mL. What is the volume of the rock?
What is 72 mL -58mL = 14mL = 14cm3?
200
If an object is less dense than the fluid it is placed in, it will ______.
What is float?
200
When the buoyant force on a ball is less than the weight of the ball, the ball will ______.
What is sink?
200
When molecules change from liquid to gas at temperatures below the boiling point, the change is called ______.
What is evaporation?
200
The ______ of an object is due to the space taken up by the atoms of the object.
What is volume?
200
Explain how to measure the volume of an irregularly-shaped object. List 3 numbered steps (as if you were writing the procedure for a lab), written in complete sentences.
What is (1) measure a volume of water in a graduated cylinder; (2) place the object into he cylinder and record the new volume; (3) Volume 1 – Volume 2 = Volume of object?
300
Objects with a high density have a small ______ for their ______.
What is volume; mass?
300
Archimedes principle states that the buoyant force is equal to __________.
What is the weight of the displaced fluid?
300
Liquid molecules have more energy than _______.
What are solid molecules?
300
A solid that has the ability to bend without breaking is considered ________.
What is ductile?
300
A small metal block with dimensions of 4 cm ´ 4 cm ´ 4 cm is placed into a tub of water and sinks. What volume of water does the metal block displace?
What is 4cm x 4cm x 4cm = 64cm3?
400
If you double the size of a piece of glass, explain why you do NOT change its density.
What is density is a ratio of mass to volume and this ratio has not changed?
400
This is how the buoyancy of an object depends on its density. Use the terms sink and float in your answer.
What is if an object is less dense than the fluid it is placed in, it will float; if an object is more dense than the fluid it is placed in, it will sink; if an object has the same density as the fluid it is placed in, it will be balanced and submerge in the fluid without floating or sinking?
400
Match arrows 1, 2, 3, and 4 on your graph with the following phases. A. Only ice is present B. Only liquid water is present C. Ice and water are present D. Steam and water are present
What is 1 = A. Only ice is present 2 = C. Ice and water are present 3 = B. Only liquid water is present 4 = D. Steam and water are present?
400
List 4 important physical properties of solids.
What are density, strength, elasticity, ductility, conductivity (thermal and/or electrical)?
400
A small metal block with dimensions of 4 cm ´ 4 cm ´ 4 cm is placed into a tub of water and sinks. What mass of water does the metal block displace?
What is 64cm3 x 1 g/cm3 = 64g = 0.064kg
500
The density of steel is 7800 kg/m3. The density of water is 1000 kg/m3. Explain how steel ships are made to float in water.
What is solid steel has a density of 7800 kg/m3 and will not float in water, however ships that are made of steel are not solid, but are mostly air; the average density of these ships is less than 1000 kg/m3 which allows them to float in water?
500
classroom has a temperature of 30 C while the air near the floor has a temperature of 25 C. What conclusions can you make about the density and buoyancy of the air in the classroom?
What is near the ceiling, the warmer air is less dense and more buoyant, so it rises to the top of the room and near the floor, the cooler air is more dense and less buoyant, so it sinks to the bottom of the room?
500
Explain the difference between boiling and evaporation. List one way that they are similar and three ways that they are different. Discuss where in the liquid each occurs, temperature, and energy.
What is BOTH BOILING AND EVAPORATION… are changing from liquid to gas BOLIING… Occurs throughout the liquid, occurs at the boiling temperature, all molecules have enough energy to break bonds, energy is going into phase change BUT EVAPORATION… Occurs at the surface only, occurs at temperatures below the boiling point, only some molecules have enough energy to break bonds, energy is going into increasing the temperature of the liquid?
500
You can hold an open cup of liquid water, but you can’t hold a cup of gaseous water vapor. Why not?
What is the molecules have too much energy to be confined to an open space?
500
A small metal block with dimensions of 4 cm ´ 4 cm ´ 4 cm is placed into a tub of water and sinks. What weight of water does the metal block displace?
What is W = m x g 0.064kg x 9.8N/kg = 0.6272N
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