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Physical Models Activity

You have explored some interesting, informative, and amusing examples of models. Now it's time to get creative and make your own model. Here is the requirement checklist for your model:

✔ Model types can include drawings, diagrams, physical models, virtual simulations, or videos.
✔ Models must be created by you, not something selected from an online or outside source.
✔ Submit a presentation, picture, video, or screenshot of your model.
✔ Submit a one-paragraph summary describing the topic you chose, your model, what it represents, how you made it, and the specific science involved. It is important that you are using science terminology and are accurate.
Now that you know how to create and submit your model, you will need to choose a topic for your model. Choose one of the three topics listed below. Select each topic for an overview.

Conservation of Mass
Atomic Theory
Thermal Energy
Here's a student example to help guide you. This is one of many ways to model the topic options. If you have an idea but are not sure, you can contact your instructor for assistance.

To learn more about how you will be graded on this assignment, review the grading rubric.

A solution at pH 1 has more hydrogen ions than a solution at pH 4. The pH of a solution refers to the hydrogen ion concentration.

The concentration of hydrogen ions and the pH of a solution are inversely proportional. This means that the higher the hydrogen ion concentration, the lower the pH, and vice versa.

A solution at pH 1 will have more hydrogen ions than a solution at pH 4.The pH of a solution is defined as the negative logarithm of the hydrogen ion concentration. The equation for calculating the pH of a solution is given as follows:

\($$pH = -\log_{10}[H^+]$$\)

In this equation, [H⁺] is the hydrogen ion concentration in moles per liter (mol/L) of solution. A change of 1 pH unit corresponds to a 10-fold change in the hydrogen ion concentration.

Therefore, if a solution has a pH of 1, it has a hydrogen ion concentration of 0.1 mol/L.

If a solution has a pH of 4, it has a hydrogen ion concentration of 0.0001 mol/L. Thus, a solution at pH 1 has more hydrogen ions than a solution at pH 4.

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The magnitude of the angular acceleration of the disk is -203.9 rad/s^2 (negative sign is indicating the direction of angular acceleration is opposite to the direction of applied forces).

The magnitude of the angular acceleration of the disk can be determined by using the equation for torque:

τ = Iα

where τ is the torque, I is the moment of inertia, and α is the angular acceleration.

The moment of inertia of a solid disk is given by the equation:

I = (1/2) * m * r^2

where m is the mass and r is the radius of the disk.

So we can substitute the values of mass and radius in the equation of the moment of inertia:

I = (1/2) * 24.3 kg * (0.314 m)^2 = 0.03898 kg*m^2

Now we can calculate the torque caused by the forces of 90 n and 125 n. These forces are applied in opposite direction so the net torque caused by them is:

τ = 90 N * 0.314 m - 125 N * 0.314 m = -7.922 Nm

So we can now calculate the angular acceleration using the torque equation:

-7.922 Nm = 0.03898 kgm^2 * α

α = -7.922 Nm / 0.03898 kgm^2 = -203.9 rad/s^2

Therefore, The magnitude of the angular acceleration of the disk is -203.9 rad/s^2 (negative sign is indicating the direction of angular acceleration is opposite to the direction of applied forces).

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Answer:

v = 16.49 m/s

Explanation:

Given that,

Length of the string, l = 1.15 m

The ball makes 137 complete turns each minute.

We know that, 1 turn = 6.28 rad

137 turns = 860.79 rad

1 min = 60 s

\(\omega=\dfrac{860.79\ rad}{60\ s}\\\\=14.34\ rad/s\)

We need to find the tangential velocity of the ball. It can be given by

\(v=r\omega\\\\=1.15\times 14.34\\\\v=16.49\ m/s\)

So, the tangential velocity of the ball is 16.49 m/s.

Answer:

Yes, at 801 °C

Explanation:

Explanation:

Removing B from the system

- Decreases the rate of the reaction. Backward reaction (formation of reactants) is favoured.

Crushing A into a powder

- Increases the rate of reaction. This is because of the increased surface area of A.

Warming the system

- Increases the rate of the reaction. Temperature is proportional to rate of reaction.

Adding more A to the system

- Increases the rate of reaction. Forward reaction (formation of products) is favoured.

Putting the system into an ice bath

- Decreases the rate of reaction. Temperature is proportional to rate of reaction.

Decreasing the pressure of the system

- Decreases the rate of the reaction.

Answer:

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The mass of gum you need to chew to chew one mole of sugar is approximately 5.68 × 10-22 grams.

To calculate the mass of gum that you need to chew to chew one mole of sugar, you need to use the following steps:

Step 1: Find the molar mass of the sugar

The molar mass of sugar is 342.3 g/mol.

Step 2: Convert molar mass to gramsTo convert the molar mass to grams, you need to divide it by Avogadro's number (6.022 × 1023), which gives you 5.68 × 10-22 grams of sugar.

Step 3: Find the mass of gum needed since it is not provided how much sugar is present in a single piece of gum, we can assume that it is negligible.

Therefore, the mass of gum needed to chew one mole of sugar is approximately 5.68 × 10-22 grams.

Hence, the mass of gum you need to chew to chew one mole of sugar is approximately 5.68 × 10-22 grams.

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The environmental impact of electric car batteries depends on the source of the electricity used to charge them and the method of disposal or recycling of the batteries.

If the electricity used to charge the batteries comes from renewable sources, the environmental impact is minimal. However, if the electricity comes from fossil fuels, the environmental impact can be significant. Additionally, proper disposal or recycling of batteries is important to minimize environmental impact. The environment refers to the natural surroundings and conditions in which people, animals, and plants live. It includes everything from the air we breathe, the water we drink, the land we live on, and the weather patterns that affect us.

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Answer:

If 1000. mL of water freezes, which of the following is a reasonable approximation for the volume of the resulting ice?

Group of answer choices

1000. mL

961 mL

1040 mL

Explanation:

Ice is fewer denser than water.

The reason is the volume occupied by the same mass of ice with water is more than the volume occupied by water. Ice has more empty space within it.

Due to this reason, ice floats on water.

When 1000ml of water freezes to ice then its volume is greater than water.

Among the given options the correct answer is 1040 mL .

The wastewater that is extracted alongside fracked hydrocarbons, also known as "produced water," is typically salty due to the high levels of dissolved minerals and salts present in the rock formations from which it is extracted.

When water is injected into the subsurface during hydraulic fracturing, it interacts with the rock formations and dissolves minerals such as sodium, calcium, and magnesium.

Additionally, the water used in hydraulic fracturing may contain additives such as salts and acids that can also contribute to the high salt content of produced water.

The high salt content of produced water poses significant environmental and economic challenges for its disposal and reuse. Treating and disposing of produced water can be costly, and improper disposal can lead to contamination of surface and groundwater resources.

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An equation which follow the law of conservation of mass is called the balanced equation. The coefficient of copper (II) nitrate is 1 .The correct option is C.

A chemical equation in which the number of atoms of reactants and products on both sides of the equation are equal is defined as the balanced chemical equation.

The coefficients are the numbers which are used to balance the chemical equation. They are added in front of the formulas. According to law of conservation of matter, mass can neither be formed nor be destroyed.

The balanced equation for the given reaction is:

Cu (s) + 2AgNO₃ (aq) → Cu (NO₃)₂ (aq) + 2Ag (s)

Here the coefficient of Cu (NO₃)₂ is 1. The number of 'Cu', 'Ag', 'N' and 'O' atoms are equal. So the given equation is balanced. The coefficient of AgNO₃ is 2, and 'Ag' is 2.

Thus the correct option is C.

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Answer:

Answer:

Potassium : 39.0983u

Sodium : 22.989769u

Neon : 20.1797u

To calculate the atomic mass of a single atom of an element, add up the mass of protons and neutrons

Hope this helps!

Answer:

D. decreasing the surface area of Zn

Explanation:

Because zinc is a reactant in the reaction, decreasing its surface area would decrease the production rate of ZnCl₂ - there are fewer particles exposed to the hydrochloric acid so there is a smaller chance of particles colliding which means there are fewer successful collisions per second.

Hope this helps!

Answer:

A chemical reaction produced a new substance.

Explanation:

I just answered this on the study island quiz.

Answer:

A chemical reaction produced a new substance or "A"

Explanation:

The correct option is (A) - This Bohr Model of atom describes that there are a total of 6 electrons in the given figure.

The electrons are positioned in circular orbitals at particular distances from the central nucleus in the Bohr model of the atom. These orbits create electron shells or energy levels, which allow us to see how many electrons are present in each shell. The number and the letter "n" are used to identify these energy levels. The first energy level nearest to the nucleus, for instance, is represented by the 1n shell. Normally, an electron resides in the shell with the lowest energy, which is the one closest to the nucleus. A photon of light's energy can raise it to a higher energy shell, but this is an unstable position, and the electron quickly returns to the ground state.

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Answer:

Volume occupied by oxygen gas at 15 degree centigrade​ is equal to \(316.5\) centimeter cube

Explanation:

Assuming Pressure is constant.

\(\frac{V_1}{T_1} = \frac{V_2}{T_2}\)

where T1 and T2 are temperature in Kelvin

Substituting the give values we get-

\(\frac{300}{273} = \frac{V_2}{288}\)

\(V_2 = \frac{288*300}{273} \\V_2 = 316.5\)

Volume occupied by oxygen gas at 15 degree centigrade​ is equal to \(316.5\) centimeter cube

Answer:

c

Explanation:

Answer:

2 Cu2S + 3 O2 = 2 Cu2O + 2 SO2

Explanation:

2 Cu2S + 3 O2 = 2 Cu2O + 2 SO2

Answer:

Explanation:

Reduction potential of Copper metal is .34 V and reduction potential of Calcium is - 2.87 V . So copper will not be able to reduce Calcium chloride to calcium . Hence no reaction will take place when a piece of copper metal is placed in calcium chloride solution .

There is ionic bonding between Mg²⁺ ions and NO₃⁻ ions.​ A Further explanation is below.

Ionic bonding seems to be a form of interaction wherein the cationic as well as unpaired electrons are powerfully electrostatically connected.

Thus the above response i.e., option D) is correct.

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The percent composition of salicylic acid is C7H6O3, or 60.87%C, 4.4%H, and 34.75%O

Answer:

The three main subatomic particles that form an atom are protons, neutrons, and electrons.

Explanation:

Answer:

The three main subatomic particles that form an atom are protons, neutrons, and electron

H₂C=CH₂ contains the most easily broken carbon-carbon bond.

Among the given options, the molecule with the most easily broken carbon-carbon bond is H₂C=CH₂.

In this molecule, the carbon-carbon bond is a double bond, consisting of one sigma bond and one pi bond. Pi bonds are generally weaker than sigma bonds due to their overlapping electron density being spread out above and below the bond axis. As a result, pi bonds are more susceptible to breakage compared to sigma bonds.

On the other hand, in OF₂C=CF₂, the carbon-carbon bond is also a double bond, but the presence of fluorine atoms enhances the bond strength due to their high electronegativity.

In H₃C-CH₃, the carbon-carbon bond is a single bond, which is stronger than a double bond and less prone to breaking.

The triple bond in N₂ is the strongest among the given options, requiring a significant amount of energy to break.

Therefore, H₂C=CH₂ contains the most easily broken carbon-carbon bond.

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Answer:

The chemistry of iron is dominated by the +2 and +3 oxidation states i.e. iron(II) and iron(III) complexes e.g. Fe2+ and Fe3+ complex ions with selected ligands, usually of an octahedral shape, a few tetrahedral iron(III) complexes are mentioned too. The reactions of the aqueous ions iron(II) and iron(III) with ammonia, sodium hydroxide and sodium carbonate are described and explained as are complexes of iron(III) with the chloride ion and cyanide ion.

principal oxidation states of iron, redox reactions of iron, ligand substitution displacement reactions of iron, balanced equations of iron chemistry, formula of iron complex ions, shapes colours of iron complexes, formula of compoundsExplanation:

Answer:

There are actually five, and there's an easy way to remember them.

Physical Description

Action

Inner thoughts

Reactions

Speech

P.A.I.R.S

This will basically help you with any story you come up with

Answer:

This question is incomplete and lacks options, the complete part and the options are:

Which of the following variables should Sarah change from one group of chamomile to the next?

A. the location of the plants

B. the height of the plants

C. the type of plants

D. the amount of water she gives the plants

The answer is A

Explanation:

This question is asking for the INDEPENDENT VARIABLE in the experiment. The independent variable of an experiment is the variable that is changed or manipulated by the experimenter in order to bring about a response.

In this experiment where Sarah wants to know where in her garden chamomile plants would grow the best. She hypothesizes that chamomile will grow best in the corner of the garden that gets the most sunlight. However, to test this hypothesis, she decides to plant several groups of chamomile in her garden as an experiment. The variable that Sarah can change in the several groups of chamomile (independent variable) is the LOCATION OF THE PLANTS.

Note that, "where" is a question of location.

Answer:

The answer is C

Explanation:

Conjugate bases are defined as the molecules or ions that remain after acids donate a proton. Conjugate base strength is determined by the strength of the parent acid. As a result, strong acids generate weak conjugate bases, while weak acids generate strong conjugate bases.

The correct option is b. HClO_4.HClO4 is the strongest acid since it has the highest Ka. Because the conjugate base of HClO4 is ClO4, which is quite stable and can handle negative charges better than the others, it is the strongest conjugate base. HClO4 is the strongest acid among the options provided because it has the highest Ka. The conjugate base of HClO4 is ClO4, which is a very stable base because it can manage the negative charge better than any other options provided.

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Gravity is the attractive force between all objects. The correct answer is A.

Gravity is the fundamental force of attraction that exists between all objects with mass. It is responsible for the formation and behavior of planets, stars, galaxies, and the entire universe. The force of gravity depends on the masses of the objects and the distance between them, and it acts in all directions. Gravity is what keeps us grounded on Earth, and it is also responsible for the motion of objects in space. The laws of gravity were first described by Sir Isaac Newton in the 17th century and later refined by Albert Einstein's theory of general relativity in the 20th century. The correct answer is option A.

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Answer:

As a substance melts, and goes from a solid to a liquid state, the kinetic energy of the molecules increases, and the molecules move faster, and they separate further and further away from each other.  The intermolecluar forces holding the molecules together become weaker.  This is why a liquid can take fill the shape of its container, whereas a solid has a fixed shape.

Explanation:

take your notes man