Ashley Tisdale's homework blog: Homework

Objective 1

Mass is more useful than weight because weight is the amount of force a gravitational pull has on someone; therefore it changes on different planets as they are different sizes. Mass is the amount of substance something has, therefore it never changes.
The volume of the box would be 619.65cm^3.
The unit of measurement for density is g/cm^3.
The formula for density is: D= m/v.
The formula for finding volume is: V=l x w x h

Objective 2

A physical change is a change in the motion of an object or in its kinetic energy. A chemical change is a change in the bond of atoms or in chemical energy.
You can tell a chemical change has occurred when the color of an object changes, when the smell has changed, when the temperature has changed, and by presence of precipitation.
The Law of Conservation of Mass is that it cannot be created nor destroyed, but rearranged in space. It was created by Antoine Lavoisier.
The thermal energy of an object is the total measurement of kinetic energy of an objects atoms and molecules. Where as temperature is an average intensity of thermal energy.
Elephant toothpaste is an example of an exothermic reaction and baking soda and vinegar is and example of an endothermic reaction.

Objective 3

All of the types of energy are related to changes in matter; KInetic, potential, electric, chemical, thermal, and electromagnetic.
kinetic
potential
Electromagnetic energy is energy that takes the form of waves.
The energy of electrons moving from one place to another is electric energy, an example of this is electricity. After all it is transfered from the power station to our house.

Objective 4

The faster particles are in motion the higher the temperature and the slower they are moving the lower the temperature.
Ice cream melts on a warm summer day because as the temperature of it gets hotter the particles start to move faster and faster making the atoms and molecules spread out more and the substance become a liquid.
As the molecules begin to vibrate they start to move quicker and the energy increases eventually the particles overcome the intermolecular forces that hold them together and they begin to spread out and “flow”.
Condensation occurs when air temperature is equal the the temperature of moisture in the air.
Sublimation is when a solid goes directly to the gaseous condition skipping the solid stage.

Objective 5

1. As volume goes up, temperature goes up, and pressure goes down.

2. When the balloons get higher in the air the temperature begins to get colder and the balloon starts to get smaller making the pressure increase. It it was filled all the way there would be to much pressure and it would pop or explode.

3. The formula for Boyles' law is pv=k.

4. It relates to our diaphram and how we breathe.

5. This relates to scuba diving because Boyles' Law is how the volume and pressure of a gas react to a constant temperature. Scuba divers have to come up very slowly from there swim otherwise to much pressure wil be created in their tank causing it and them to explode.

Objective 6

Charles’ law, also known as the law of volume describes how gases expand when heated.
If the temperature increases the density decreases.
Jacques Charles was the first person to fly in a hydrogen balloon and Pilatre de Rozier was the first person to die in one.
Charles and his partner Nicholas- Louis Robert had a wonderful accomplishment of going 1,800 feet into the air in the first manned balloon.
Pressure and the number of molecules remain the same.

Cites

Ashley Tisdale's homework blog

Wednesday, November 10, 2010

Homework

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