Physical Science ch4 lesson 2

1. Define electron cloud in your own words.

An electron cloud is a field of possibilities for the location of a electron around an atom.

2. Use the phrase energy level in a sentence.

The electron moved up a energy level after absorbing the energy.

3. What did the gold-foil experiment show?
a. Electrons exist.
b. Protons exist.
C. An atom has a nucleus.
d. Electrons move in circles.

C (?)

4. List the experimental evidence that led to the development of these atomic models:
Thomson’s, Rutherford’s, Bohr’s

Movement of electrons in a cathode ray tube, unanticipated behaviors from light particles, and

5. Explain why Rutherford’s model is sometimes called the nuclear atom.

Because it was the first model to introduce the nucleus.

6. Describe the way electrons, protons, and neutrons are arranged in an atom.

Protons and neutrons are both located at the center of the atom, in a cluster of particles called the nucleus. Electrons are located in a field of probability around the nucleus.

7. Decide whether research on particles such as quarks is likely to have an important effect on the principles of chemistry.

I think research on particles like quarks will not have a significant effect on the principles of chemistry, but I think they will enhance our understanding of chemistry as a whole.

Student Government

Wrapping up this year’s student government, we had a few different topics covered, including the Minecraft server, the podcast (done by other people) and the talent show (also done by other people). On the topic of the server we mostly went over the progress made, and set up a new way to organize bugs and suggestions on Trello. For the podcast, it was reported that all was well, but the most recent episode was behind because of finals. There were a few things that my committee needed to tackle, but there wasn’t much to do. At the end of class we did a tradition for Student Government, which was to drink juice at the end of the semester.

Physical Science ch 4 pt 1

1. Explain the difference between a neutron and a nucleus.

A neutron is a partical that is part of the nucleus, but the nucleus consists of neutrons and protons

2. An atom contains equal numbers of protons and electrons.

3. Which has no charge?
a. electrons
b. protons
c. neutrons
d. nucleus

C.

4. Name the particles that make up an atom and tell where they are located.

Neutron, proton, electron. The neutrons and protons are located in the nucleus, and the electrons are located in the space outside of the nucleus.

5. Explain in your own words what is meant by the law of definite proportions.

The Law of Definite Proportions means that any amount of a pure compound will be made of proportional amounts of the same elements as any other pure amount of that compound.

6. Describe how Lavoisier was able to demonstrate the law of conservation of mass.

By conducting experiments in closed environments and noting the starting and ending mass.

7. Show that the ratio of the number of atoms of hydrogen to the number of atoms of oxygen in the compound of water is 2 to 1.

The number of atoms of hydrogen to the number of atoms of oxygen in water is shown by the scientific name for water, H2O, with the “H” meaning hydrogen, the “2” meaning 2 (in reference to the hydrogen), and the “O” meaning oxygen, additionally, you could preform electrolysis on it and measure the gasses you get.

8. Compare the mass and the volume of a proton with the mass and volume of an electron.

A proton is 1.007316 AMU, while a electron is 0.000549 AMU. This makes a proton roughly 1800 times heavier than a electron.

Science ch2 lesson 3

1. _________ states that an object’s acceleration is the ratio of net force to the object’s mass.

Newton’s second law of motion.

2. Define centripetal force in your own words.

Centripetal force is the force that acts perpendicular to the velocity of a object and towards the center of a circle.

3. Explain how you know the forces acting on an object at rest are balanced.

Because for a object to be at rest there must be no net force moving it, and for there to be no net force you need either no forces on a object or for all forces to counteract each other.

4. Compare how your weight, mass, and the normal force exerted by the floor change when you are in an elevator that starts from rest and accelerates upward.

when you are on a elevator that begins to accelerate from a stop upwards Your weight, as it is a measurement of the force exerted by gravity on a object, stays the same, your mass also stays the same, but the normal force increases.

5. How does the velocity of an object traveling in a straight line change if a nonzero net force acts in the same direction as the object’s velocity?

The velocity increases.

6. Calculate – The net force on a rock with a mass of 2.0 kg is 19.6 N. What is the acceleration of the rock?

9.8m/s^2

7. Calculate – At the start of a race, the net force on a sprinter is 640 N. If the mass of the sprinter is 80.0 kg, find the sprinter’s acceleration.

8m/s^2

Student Government

Despite Corona virus preventing us from going outside, my student government class is still attempting to do some of the things that were planned, like the “Eggstravaganza” event and the “Spring Fling” event. The first online class we had included a lot of brainstorming to find a way to do the events online. Eventually, we settled on hosting a Minecraft server for several of the events. One of the first things that was decided upon was who would be the admins on the server, I was elected to be one, as well as the other students who knew a lot about the game. After deciding who the admins would be, we started setting up the server and building the lobby area. The next things we need to do are setting up a survival world, a building world, an event world, and setting up permissions. After we do all of that, the server will be up and running.

Science, ch3 lesson 2

1. _________ is force per unit area.

Pressure.

2. Restate Archimedes’ principle in your own words.

The buoyant force on any object is equivalent to the weight of the fluid it displaces.

3. Describe two ways to increase the pressure exerted on an object.

Decrease the unit area or increase the force on the aforementioned unit area.

4. Compare the pressure at a depth of 10 m to a depth of 2000 m below the surface of the ocean. Explain the cause of the difference in pressure.

The pressure at 10 m below sea level is lower than the pressure at 2000 m, and the cause of the difference in pressure is the amount of water weighing down on it.

5. Explain why you feel that you weigh less than normal when you are in a swimming pool.

You weigh less than normal because the buoyant force is partially counteracting gravity.

6. Evaluate the statement, “Heavy things sink and light things float.” Is the statement true or false? If false, rewrite a true statement about floating and sinking objects.

The statement “Heavy things sink and light things float” is incorrect, a more correct statement would be “Objects denser than the fluid they are suspended in sink, and objects lighter than the fluid it is suspended in float.”

Science Chapter 2 Lesson 1

1. ______ is the combination of all forces acting on an object.

Net force

2. Restate Newton’s first law of motion in your own words.

Newton’s first law states that if a object has a net force of 0 than it will stay at it’s current velocity.

3. State what you know about the forces acting on an object that is moving at a constant velocity. Are the forces balanced or unbalanced.

If a object is moving at constant without acceleration or deceleration of velocity then the forces on it must be balanced.

4. Describe how a 300-N force can combine with a 100-N force to produce a net force of 200N on a sled.

If the 300N of force are headed parallel to the 100N force then it would combine for a net force in the direction of the 300N.

5. Describe the effect balanced and unbalanced forces have on objects’ motion.

Balanced forces mean that the all of the forces cancel out making the net force 0, while an object with unbalanced forces has some forces that don’t cancel out, making the net force greater than 0.

6. Which statement is true?
A. An object in motion always has an unbalanced force acting on it.
B. An object in motion cannot be acted on by more than one force.
C. An object at rest will remain at rest unless an unbalanced force acts on it.
D. The net force of an object in motion can’t be zero.

C.

7. Imagine a car being acted on by unbalance forces. What do you know about the motion of the car?

The car is accelerating or decelerating in some direction.

8. Assess the differences between an object that has no force acting on it and an object that has a zero net force acting on it. Can you determine which is which?

Provided that you can’t observe the compression from the forces on the object with a net force of 0 there is no way to tell the difference.

Science Ch 1 Lesson 3

1. ______ describes the steepness of a line on a graph.

Slope.

2. Define rise and run in your own words.

Rise is the distance on the y-axis in a graph, and run is the distance on the x-axis in a graph.

3. State appropriate units for the x-axis and y-axis on a position-time graph for a turtle, a walking person, and an automobile on the highway.

cm/s, km/h, km/h.

4. Describe the speed-time graph of an object that is not moving.

flat line along the axis representing time.

5. Describe the motion of the object whose position-time graph is shown below.

The object was accelerating from a stop.

6. Calculate the slope of the line on a position-time graph for a car that starts at the origin at 0s and moves at a constant velocity for 15 s to a position 300 m from the origin.

20 m/s

Student Government

Last time I was at my student government class my council finished up the posters for the Eggstravaganza, and then began creating rules for the games at the event we were managing. We started with the egg hunt, where we defined a play area, and figured out how to manage the egg hunt for older and younger kids. Then, we moved onto musical chairs, which we figured was self-explanatory, so we quickly moved on.

The next game that we made the rules for was a modified version of pin the tail on the donkey, which was pin the tail on the rabbit, which we didn’t as so much make rules, but instead made guidelines for how it would work, where instead of it using a pin to attach the tail to the rabbit, for safety we decided on using tape.

The last game we made the rules for was a bunny hop race where we decided to mark the start and end of the race with cones, and tie the feet of the participants together with thin paper.

Science Ch 2 Lesson 2

1. Define normal force in your own words.

The Normal Force is the force exerted from contact perpendicular to gravity with a object.

2. _______ is the gravitational force acting on an object.

Weight.

3. Identify all of the types of forces acting on you as you sit in your chair.

Gravity, Normal Force, and Static Friction.

4. State the universal law of gravitation.

All objects are attracted to each other with a fore that depends on the masses of the objects and the distance between them.

5. Organize Information – Copy the graphic organizer below and list forces and brief descriptions of forces mentioned in this lesson.

6. Give an example of a moving object that has balanced horizontal forces and balanced vertical forces acting on it.

???

7. Why do you notice the pull of Earth’s gravity but not the pull of the Sun’s gravity?
A. Gravity only pulls on objects that are touching each other.
B. Earth is much heavier than the Sun.
C. The Sun is very far away.
D. The Sun’s gravity only pulls on you during the day.

Option C

8. Evaluate the following statement: “An object is acted on by either horizontal or vertical forces.” Give an example not discussed in the text that shows this statement is false.

A plane goes forward and up.

9. Construct a diagram of a mass hanging from a spring scale. What are the forces acting on the mass?