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All About that Mass
Diagrams
Energy
Pressure
Miscellaneous
100
If mass increases or decreases in an experiment, has the Law of Conservation of Mass been violated?
No! We can add mass to the system or remove it but it is NOT destroyed or created.*
100
At the particle level, diagram the diffusion of dye in warm water. How is this different than cold water?
*Diagram should show particles moving quickly. Warm molecules move more quickly and will bump the dye particles and spread them out more quickly than in cold water.
100
What is the difference between between heat (thermal energy) and temperature?
Temperature- just related to the speed of the particles Heat (Thermal Energy)- speed and amount of particles
100
What is gas pressure?
The force exerted by gas particles as they collide with the walls of a container. The pressure is related to the frequency and speed of the collisions.
100
Calculate and round to correct number of Sig. Figs 23.4 * 0.84235
19.71099 should be rounded to 3 decimal places: 19.7
200
Which weighs more a pound of feathers or a pound of lead?
They both weigh a pound.
200
Diagram the process of evaporation at the particle level. Include the motion, arrangement, and density in the initial and final state.
Evaporation is liquid going to gas. Particles go from: close together, moving medium speed, and not organized neatly to: spread out, moving rapidly, and all over the place.
200
How much energy is required to boil 5.6 grams of 100°C water? The heat of vaporization for water is 2,260J/g.
12,656J or 12.656kJ
200
Sketch the relationship between pressure and volume. What kind of mathematical relationship is this?
As volume increases, pressure decreases. This is an inverse relationship.
200
Convert 6.54 kg to g.
6,540g
300
Which metal has a greater density? Lead: 12.4g occupies 3.2mL Zinc: 174g occupies 96.5mL
Lead -density of 3.88g/mL Zinc -density of 1.80g/mL
300
Draw a cooling curve for water that where water vapor is cooled down to -34°C.
Should show gas cooled and condensing at (100°C) and freezing at (0°C).
300
What type of energy is being stored stored during evaporation?
Phase energy- the phase is changing!
300
If the difference in pressure in a barometer is 43mmHg and the Pflask is higher. If the pressure of the room is 735mmHg, what is the pressure of the flask?
778mmHg
300
Explain why both silver and gold sink in water, by comparing densities.
Both have a greater density than water so they sink.
400
Draw before/ after particle diagrams that reflect the average observed change in mass for steel wool that was burned. The observed change in mass is positive 0.40g.
After diagram should show an INCREASE in the mass (more particles). Extra question: Where did it come from?
400
Draw an LOL diagram for a can of coke at 25°C that is put into a freezer and frozen?
thermal energy decreases phase energy decreases from two bars to one bar
400
What happens to the surroundings of water throughout the entire cooling process? Why?
The surroundings heats up because the water releases energy as it moves to a lower energy state and cools down.
400
A sealed container is heated from -30°C to 65°C. If the original pressure was 684mmHg, what is the new pressure?
951mmHg
400
Why must temperature be converted into Kelvin before being used in Gas Laws?
If Celsius temperatures are used, there is the potential to calculate negative pressures, particles, and temperatures. All of these are impossible.
500
What will take up more space- 40g of aluminum or grams of lead? Density of lead 6.8g/mL; density of aluminum 2.7g/mL.
Aluminum takes up more space because it is less dense- particles are not packed as tightly.
500
The densities of two liquids, Liquid A and Liquid B, are measured and compared. Liquid A has more density than Liquid B. Draw and label particle diagrams of each liquid that are consistent with what you know about their densities and states of matter. Do this in two different ways.
the particles of B can be smaller or further spread apart than A.
500
Using a microwave, energy is added to 3 gram of ice at -3°C to melt it and raise the temperature of the water to 34°C. Calculate the total amount of energy needed to complete the process described above. Heat capacity for ice is 2.1 J/g°C. Heat capacity for water is 4.18 J/g°C. Heat of fusion is 334 J/g Heat of vaporization is 2260 J/g
1,447.26J or 1.44726kJ
500
A chemical reaction must be performed in a special container with a volume of 3.4L. The scientists performs the experiment at 85°C, 80 units of particles, and a pressure of 2.6atm. Before running the experiment a second time, the scientists adds 45 more units of particles and decreases the temperature to -45°C. What will the new pressure be?
2.59atm
500
Name three of the five tenets (principles) of Kinetic Molecular Theory.
-gas particles move in a straight line until they hit something. -gas particles do not stick together. -gas particles do not lose energy when they collide. -speed of particles is directly related to the temperature. -pressure is related to the speed and frequency of collisions.