25. label the model to show the correct locations of a proton, neutron, and electrons. how many protons are present in the model shown?
26. which element is shown to the right?
27. how many valence electrons does oxygen have?
28. you draw a picture of an atom of nitrogen. how many dots would you draw to represent the number of electrons?
29. subatomic particle that has little mass, determines reactivity and is negatively charged:
30. subatomic particle that has 1 amu mass, positively charged and gives the atom its name:
31. subatomic particle that has 1 amu mass, no charge and is found in the nucleus:
energy: potential vs kinetic, energy types and transformation, heat transfer
32. use the roller coaster to answer the following questions.
describe the energy at each point. label each point’s
potential and kinetic energy as increasing, decreasing,
highest, lowest, or medium.
| | a | b | c | d |
| --- | --- | --- | --- | --- |
| pe: | | | | |
| ke: | | | | |
a. at what point is kinetic energy increasing?
b. at any point on the rollercoaster, the total amount of energy is
(increasing / decreasing / the same)
33. what does the law of conservation of energy state?
34. a flood gate stops the flow of water in a river, similar to a dam. how would one investigate how to transform potential energy into kinetic energy with a flood gate?

Question

25. label the model to show the correct locations of a proton, neutron, and electrons. how many protons are present in the model shown?
26. which element is shown to the right?
27. how many valence electrons does oxygen have?
28. you draw a picture of an atom of nitrogen. how many dots would you draw to represent the number of electrons?
29. subatomic particle that has little mass, determines reactivity and is negatively charged:
30. subatomic particle that has 1 amu mass, positively charged and gives the atom its name:
31. subatomic particle that has 1 amu mass, no charge and is found in the nucleus:
energy: potential vs kinetic, energy types and transformation, heat transfer
32. use the roller coaster to answer the following questions.
describe the energy at each point. label each point’s
potential and kinetic energy as increasing, decreasing,
highest, lowest, or medium.
|   | a | b | c | d |
| --- | --- | --- | --- | --- |
| pe: |  |  |  |  |
| ke: |  |  |  |  |
 a. at what point is kinetic energy increasing?
 b. at any point on the rollercoaster, the total amount of energy is
 (increasing / decreasing / the same)
33. what does the law of conservation of energy state?
34. a flood gate stops the flow of water in a river, similar to a dam. how would one investigate how to transform potential energy into kinetic energy with a flood gate?

Accepted Answer

### Question 27:
# Answer:
6
# Explanation:
## Step1: Recall Oxygen's atomic structure
Oxygen has an atomic number of 8, so its electron configuration is $1s^2 2s^2 2p^4$.
## Step2: Identify valence electrons
Valence electrons are in the outermost shell. For oxygen, the outermost shell (n = 2) has $2s^2 + 2p^4 = 6$ electrons.

### Question 28:
# Answer:
7
# Explanation:
## Step1: Recall Nitrogen's atomic number
Nitrogen has an atomic number of 7, meaning it has 7 electrons (in a neutral atom, electrons = protons = atomic number).
## Step2: Determine dots for electrons
When drawing an atom (e.g., Lewis dot structure), the dots represent valence electrons? Wait, no—wait, the question says "to represent the number of electrons" (maybe a Lewis dot structure for electrons? Wait, no, maybe a Bohr model? Wait, no, the question is "How many dots would you draw to represent the number of electrons?" Wait, maybe it's a Lewis dot structure for valence electrons? No, the question says "number of electrons" (total). Wait, no, nitrogen has 7 electrons. Wait, maybe the question is about valence electrons? No, the wording is "number of electrons". Wait, no, in a Lewis dot structure, dots represent valence electrons, but if it's a model showing all electrons, but the question says "draw a picture of an atom of nitrogen. How many dots would you draw to represent the number of electrons?" Wait, maybe it's a mistake, but nitrogen has 7 electrons. Wait, no, maybe the question is about valence electrons? No, the user's question—wait, the original problem: "You draw a picture of an atom of nitrogen. How many dots would you draw to represent the number of electrons?" Wait, maybe it's a Lewis dot structure for valence electrons? No, nitrogen has 5 valence electrons. But the question says "number of electrons" (total). Wait, no, maybe the question is misworded, but nitrogen has 7 electrons. Wait, no, let's check: atomic number of N is 7, so electrons = 7. So if drawing dots for all electrons, but usually Lewis dots are for valence. But the question says "number of electrons"—maybe it's a mistake, but the answer should be 7? Wait, no, maybe the question is about valence electrons. Wait, no, the user's question: let's re - read. "You draw a picture of an atom of nitrogen. How many dots would you draw to represent the number of electrons?" So total electrons: 7. So the answer is 7.
## Step1: Recall Nitrogen's atomic number
Nitrogen has an atomic number of 7, so a neutral nitrogen atom has 7 electrons.
## Step2: Determine dots for electrons
If the dots are representing all electrons (assuming a model where dots = electrons), then we draw 7 dots.

### Question 29:
# Answer:
Electron
# Explanation:
## Step1: Recall subatomic particle properties
- Electrons have a mass of about 1/1836 amu (little mass), are negatively charged, and are involved in chemical reactions (determine reactivity).
- Protons have 1 amu, positive charge.
- Neutrons have 1 amu, no charge.
## Step2: Match the description
The particle with little mass, negative charge, and determines reactivity is the electron.

### Question 30:
# Answer:
Proton
# Explanation:
## Step1: Recall subatomic particle properties
- Protons have a mass of 1 amu, are positively charged, and the number of protons (atomic number) defines the atom's name (element).
- Electrons have little mass, negative charge.
- Neutrons have 1 amu, no charge.
## Step2: Match the description
The particle with 1 amu mass, positive charge, and gives the atom its name is the proton.

### Question 31:
# Answer:
Neutron
# Explanation:
## Step1: Recall subatomic particle properties
- Neutrons have a mass of 1 amu, no charge, and are found in the nucleus (along with protons).
- Electrons have little mass, negative charge, and are outside the nucleus.
- Protons have 1 amu, positive charge, in the nucleus.
## Step2: Match the description
The particle with 1 amu mass, no charge, and found in the nucleus is the neutron.

### Question 33:
# Answer:
Energy cannot be created or destroyed, only transformed from one form to another.
# Explanation:
## Step1: Recall the Law of Conservation of Energy
The fundamental principle is that the total energy of an isolated system remains constant; energy is neither created nor destroyed, but can change forms (e.g., potential to kinetic, kinetic to thermal, etc.).
## Step2: State the law
The Law of Conservation of Energy states that energy cannot be created or destroyed, only transformed from one form to another.

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

Question 27:

Step1: Recall Oxygen's atomic structure

Step2: Identify valence electrons

Question 28:

Step1: Recall Nitrogen's atomic number

Step2: Determine dots for electrons

Step1: Recall Nitrogen's atomic number

Step2: Determine dots for electrons

Question 29:

Step1: Recall subatomic particle properties

Step2: Match the description

Question 30:

Answer: