Create your own Model of an Atom. You may choose any element you would like to be represented by your model of an atom. Then photograph your model and put in a PowerPoint slide then submit to the assignment box.

The model must include:

1) All parts of an atom.

2) Each part must be labeled.

3) The parts must be placed in the correct location in the atom.

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The excretory system removes waste from the body.

It includes several organs such as the kidneys, large intestine, liver, skin, and lungs. These organs work together to filter out harmful metabolic waste products and excess water from the blood, ensuring that waste does not build up to harmful levels and maintaining the body's homeostasis.

Functions of the Excretory System:

Newton's third law of motion declares that forces always come in action-reaction pairs; every action force has an equal and opposite reaction force. This principle explains the motion and equilibrium in every interaction between two objects, highlighting the intrinsic symmetry of forces in nature.

Newton's third law of motion is a fundamental principle that provides insight into the interactions between two objects. The law states that for every action, or force, exerted by one object onto another, there is an equal and opposite reaction force. This means that whenever one body applies a force onto a second body, the first body will experience a force that is equal in magnitude but opposite in direction. This reciprocal action is what maintains the balance of forces in the universe.

For example, if you were to push against a wall, the wall pushes back against you with an equal force in the opposite direction. This is why you do not move the wall, and you feel the force of your own push being reflected back onto you. Another classic illustration is when two ice skaters push off against each other; both move in opposite directions due to the equal but opposing forces exerted.

In any interaction, no force exists alone; there are always action-reaction pairs. These forces are part of the same interaction and cannot be separated, reflecting a basic symmetry in nature. Newton's third law reveals the connectedness of forces and ensures that there is a constant state of motion or equilibrium in a system as long as external forces are balanced.

Answer are B,D, and E

Explanation:

Density is the mass of an object or substance per unit volume. The symbol for density is [tex][/tex] and it can be calculated using the formula as follows.

                       [tex]\rho[/tex] = [tex]\frac{mass}{volume}[/tex]

Density is derived from mass which can be in grams or kilograms and volume which can be in liters etc. Therefore, density is a derived unit of measurement. We do not need any balance or scale to determine the density.

The statements in the options that accurately describe density are as follows.

1. since Beatrice is applying force to the box, she is doing work

2. formula is work = force x displacement

3. displacement = 2 meters, force = 40 N

work = 40 x 2 = 80 Joules

Answer:

1. since she is applying force to the box, she is doing work

2. formula of work = force x displacement

3. displacement = 2 meters, force = 40 N

work = 40 x 2 = 80 Joules

Explanation:

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Question 1: Turn 25 coins tails up. You now have 50% parent material and 50% daughter material. What is the half life of this substance? (20 Points)

Answer:

Based upon the given information, we can assume that the half life of this coin material is 5 years.

Question 2: Imagine that another half life has gone by. Remember that ONLY the parent material can change to the daughter material. Turn over your pennies to represent the passing of another half life. How much total parent material and how much total daughter material do you now have? You may express your answer in number of pennies or in %. (Note: Since you cannot turn over half a penny, round the actual number of pennies you would turn over up.) (20 points)

Answer:

Based upon the given information from Question 2 and Question 3, we can assume that 13 additional coins would be turned over.  We started with 50, than flipped 50% of them over, and now another 50% over.  We have 12 coins left.

Question 3: How many half lives will pass before you have only 3 pennies that are parent material and 47 pennies that are daughter material? (20 Points)

Answer:

Based upon the given information from all the questions, and based upon our answers we can assume this:

1st half-life: 50 turned to 25 coins

2nd half-life: 25 turned to 12 coins

3rd half-life: 12 turns to 6 coins

4th half-life: 6 turns to 3 coins

So, after 4 half-lives (or after 20 years) we would have 3 coins left that have parent material.

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For future reference please do not post as complex questions like this, if you do (post a question that is similar to this) please state the following information:

"All questions posted in this post relate to one-another and cannot be answered without the other questions..."

Answer:

Explanation:

Esters  contains  a  double  bond  between  carbon  atom  and  oxygen  atom  while  carboxylic  acid  lack  double  bond  between  carbon  and oxygen atom.The  lack  of  double  bond in  carboxylic  acid  make  the  force  of  interaction between  carbon  and  oxygen  strong  and  particles  become tightly  packed  which  make  carboxylic  acid  solid.  The  presence  of  double  bond  in  esters make  the  force  of  interaction  weak  thus  they  are  liquid.

Answer:

can be elements or compounds.

Explanation:

A decomposition reaction occurs when one compound origin two or more compound, or when it breaks and form its elements. For example:

2NaN₃(g) → 3N₂(g) + 2Na(s)

It was formed a compound (N₂) and an element (Na).

Answer: Higher the hydrogen ion concentration, lower will be the pH.

Solution:

The negative logarithm of hydrogen ion concentration in mol per litre of the solution.

pH= power of hydrogen ions

[tex]ph=-log[H^+]=log\frac{1}{[H^+]}[/tex]

As we can see from the formula ,if the concentration of hydrogen ion is inversely proportional to pH.

The higher the hydrogen ion concentration, the lower the pH. Therefore, option B is correct.

The pH scale is a measurement of the acidity or alkalinity of a solution. It ranges from 0 to 14, with 7 being considered neutral. A pH value below 7 indicates acidity, while a pH value above 7 indicates alkalinity.

The pH of a solution is determined by the concentration of hydrogen ions (H+) present in the solution.

When the concentration of hydrogen ions increases, the solution becomes more acidic, and the pH value decreases. This is because hydrogen ions are responsible for the acidic properties of a solution.

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Answer:

Pollution in our environment is actually changing the chemistry of large bodies of water.

Explanation:

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Answer:Chemistry is the branch of science that deals with the properties, composition, and structure of elements and compounds, how they can change, and the energy that is released or absorbed when they change.

Explanation: verified answer

1. Radiation is the process in which energy is emitted by one object transmitted through space and absorbed by another.

2. Conduction is transfer of heat between two objects that are touching.

3. An example of conduction is when air molecules touch the warm ground, which heats them up. Therefore, For 1. option C, 2. option A, 3. option A is correct.

The term radiation is defined as the energy that comes from a source and travels through space at the speed of light. This energy has an electric field and a magnetic field linked with it, and has wave-like properties.

Conduction is heat transportation between two objects that are touching each other. When two objects touch and one has a greater temperature than the other than heat is transferred to the object with the lower temperature.

A common example of conduction is the process of heating a pan on a stove. The heat from the burner convert directly to the surface of the pan.

Thus, For 1. option C, 2. option A, 3. option A is correct.

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Answer:

CH4 + 2O2 → CO2 + 2H2O

ch4 +202-->co2+2h20

Steps in Balancing a Chemical Equation

Count each type of atom in reactants and products. ...

Place coefficients, as needed, in front of the symbols or formulas to increase the number of atoms or molecules of the substances. ...

Repeat steps 1 and 2 until the equation is balanced.

Steps in Balancing a Chemical Equation

Count each type of atom in reactants and products. ...

Place coefficients, as needed, in front of the symbols or formulas to increase the number of atoms or molecules of the substances. ...

Repeat steps 1 and 2 until the equation is balanced.

The approximate mass of strawberries would be the same on freezing as according to the law of conservation of mass , mass can neither be created nor destroyed, it would only have change in density.

According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.

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Answer:

The one you chose is the correct answer! You can count on the other persons answer.

Explanation:

Also.... Im in CAVA too, 6th grade

Anton van Leeuwenhoek discovered tiny, single-celled organisms known as animalcules, now identified as bacteria, by examining dental plaque under his homemade powerful simple microscope.

Anton van Leeuwenhoek, often referred to as the Father of Microbiology, made groundbreaking discoveries using a microscope he crafted himself. One of his most notable findings was when he examined the plaque from his own teeth. What he saw were tiny living organisms with a single cell, which he termed animalcules, now known as bacteria. His simple microscopes, through his superior lens-making skill, were almost as powerful as modern light microscopes. Leeuwenhoek's microscopes provided better resolution than other microscopes of his time, enabling him to observe human cells and bacteria closely. The discovery of these microorganisms laid the foundations of microbiology, a field that has evolved significantly since his time.

Anton van Leeuwenhoek discovered bacteria, which he called animalcules, with self-made microscopes almost as powerful as modern ones, marking a seminal event in microbiology.

When Anton van Leeuwenhoek examined the plaque from his teeth under his homemade microscope, he discovered tiny living entities, which he named animalcules ("tiny animals"). These observed organisms are what we today refer to as bacteria

Leeuwenhoek's skill in crafting lenses led to the creation of a microscope that was nearly as powerful as our modern light microscopes, enabling him to be the first person to observe human cells and bacteria. His work marked a significant leap in the field of microbiology, confirming the existence of microscopic life which was previously only speculated.

The Lanthanide series belongs to the f-block of the periodic table, while the Actinide series belongs below the Lanthanide series in the f-block.

The Lanthanide series belongs to the f-block of the periodic table and is located below the main body of the periodic table. It consists of the 15 elements from lanthanum (atomic number 57) to lutetium (atomic number 71). The Lanthanide series is also known as the rare earth elements.

The Actinide series, on the other hand, belongs to the f-block of the periodic table and is located below the Lanthanide series. It consists of the 15 elements from actinium (atomic number 89) to lawrencium (atomic number 103). The Actinide series is also known as the actinides.

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            Potassium has the largest atomic radius.

                        Using periodic table trends one can easily compare the atomic radii of elements. The trends in atomic radii are as follow,

Trends in Groups:

                             Moving from top to bottom along the groups the atomic radii increases because as you move from top to bottom the number of shells increases hence, the distance of valence electrons from nucleus also increases and therefore, atomic radius increases.

Trends is Periods:

                             Moving from left to right along the periods the atomic radii decreases. This is because the number of protons and electrons increases but the the valence shell remain the same hence, causing more nuclear charge and more attraction between the valence electrons and nucleus.

           Potassium, Calcium, Cobalt and Nickle all are present in same period. Potassium present at the extreme left will have greater atomic radii of 0.227 nm while Co and Ni at the middle of period will have atomic radii of 0.125 nm each. While, the atomic radius of Calcium next to K is 0.197 nm.

Potassium has the largest atomic radius because the atomic radius generally increases as you move down on the periodic table, and Potassium is highest in the given options.

The atomic radius generally increases as you move down a group in the periodic table because as you go down a group, an additional electron shell is added, increasing the distance between the nucleus and the outermost electron shell. Of the elements listed: Potassium, Calcium, Cobalt and Nickel, Potassium is highest in Group 1 (also known as Alkali metals), and thus it has the largest atomic radius.

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Answer:

in 79.85 g of Fe2O3 there will be 0.5 moles of Fe2O3

Explanation:

To find the number of moles we must calculate the molecular weight of iron oxide, for that we use the periodic table:

mFe = 55.845 g/mol

mO = 15.999 g/mol

mFe2O3 = (2x55.845) + (3x15.999) = 159.687 g/mol

1 mole of iron oxide weighs 159.687 g, therefore, to calculate the number of moles present in 79.85 g it will be equal to:

nFe2O3 = 79.85/159.687 = 0.5 moles

Aquatic systems are characterized by abiotic factors, biodiversity, and water quality/chemistry. Each of these factors impacts the types of organisms that can survive in the environment and overall health of the system.

Aquatic systems are characterized by three principal factors: abiotic factors, biodiversity, and water quality/chemistry.

Abiotic factors refer to the nonliving elements like sunlight, temperature, and salinity that directly affect the organisms living in these ecosystems. For example, in warmer temperatures, the water can hold less dissolved oxygen which can limit the types of species that can survive.

Biodiversity pertains to the variety of life forms present in the aquatic environment. It can range from microscopic organisms like phytoplankton to large mammals such as whales. The level of biodiversity often provides a measure of the health of the system.

Water quality/chemistry is extremely important in determining the types of organisms that can live in an aquatic habitat. Factors such as pH level, the amount of dissolved oxygen, nutrient content, and presence of pollutants all play an essential role.

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Answer: There would be no more coal left to use.

Explanation:

nonrenewable resources are rare and not so easily to be replaced

The answer is A seafloor that was geologically active with earthquakes, volcanoes, and mountain chains.