Communicating Results
Dimenstional analysis: How far can you travel in 7 hours of driving if your rate of speed is 55 miles per hour?
Answer:
385 miles
Explanation:
To solve this question using dimensional analysis we first must seperate the speed into a fraction. Then we multiply this by the amount of hours, this will cancel out the hours giving us the speed.
[tex]\frac{55 mi}{1h}[/tex] × 7 h = 385 miles
plz help!!
A group of students performed an experiment to prove the law of conservation of energy. In the experiment, a flask containing water at room temperature was shaken vigorously for a few minutes. The table shows a partial record of the temperature of the water before and after shaking.
Experimental Record
Temperature
Before Shaking 21 °C
After Shaking Unknown
What best predicts the unknown temperature? (3 points)
Less than 21 °C because heat energy is formed from the energy used in shaking
Greater than 21 °C because heat energy is formed from the energy used in shaking
Less than 21 °C, because the total energy of the system after shaking is higher than before shaking
Greater than 21 °C, because the total energy of the system after shaking is higher than before shaking
9.
(01.04 HC)
The table shows the potential energy and kinetic energy of a skier at two different positions on a hill.
Position and Energy
Position (above ground) Kinetic Energy Potential Energy
100 meters 0 units 50,000 units
60 meters ? 30,000 units
What is the kinetic energy of the skier at a height of 60 meters above ground? (3 points)
20,000 units, because total energy remains unchanged
80,000 units, because total energy remains unchanged
20,000 units, because total energy of the skier decreases
80,000 units, because total energy of the skier decreases
Answer: Greater than 21 °C because heat energy is formed from the energy used in shaking
Explanation: I got this test and i got it right
The temperature of the water will be greater than 21 °C because the shaking converts the kinetic energy into thermal energy. The kinetic energy of the skier at a height of 60 meters is 20,000 units.
Explanation:The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another. In the experiment described, the shaking of the flask converted the kinetic energy of the students' motions into thermal energy, thereby increasing the temperature of the water. Therefore, the temperature of the water after shaking will be greater than 21 °C because heat energy is formed from the energy used in shaking.
The kinetic energy of the skier can be calculated by subtracting the potential energy at the height of 60 meters from the potential energy at the height of 100 meters. Since the potential energy at the height of 100 meters is 50,000 units and the potential energy at the height of 60 meters is 30,000 units, the difference is 20,000 units. Therefore, the kinetic energy of the skier at a height of 60 meters is 20,000 units.
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4. Distinguish where kinetic energy and
potential energy are the greatest in the loop.
Answer:
We need a picture of the problem to solve!
Explanation:
Potential energy is greatest at the top of a loop (like a rollercoaster or pendulum), due to height and gravity. Kinetic energy, or the energy of motion, is greatest at the bottom of the loop, due to speed and the downward pull of gravity.
Explanation:The distinction between where kinetic energy and potential energy are greatest in the loop of, say, a roller coaster or pendulum swing depends on gravity and motion.
At the top of the loop, the potential energy is at its greatest. This energy is stored due to the object's position relative to other objects, height, and gravity. Potential energy is highest when the rollercoaster is at its highest point because gravitational pull is maximized and movement is momentarily paused.
On the other hand, kinetic energy, which is energy in motion, is greatest at the bottom of the loop. This is because all the potential energy has been converted into kinetic energy as the rollercoaster or pendulum descends, speed increases, and pulls downwards by gravity.
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A sample of gas is enclosed in a container of fixed volume, Identify which of the following statements are
true. Check all that apply.
If the container is heated the gas particles will lose kinetic energy and temperature will increase.
If the container is cooled, the gas particles will lose kinetic energy and temperature will decrease.
If the gas particles move more quickly, they will collide more frequently with the walls of the container
and pressure will increase.
If the gas particles move more quickly, they will lose energy more rapidly and collide with the walls of
the container less often, and pressure will decrease.
If the gas particles move more quickly, they will collide with the walls of the container more often and
with more force, and pressure will increase.
Answer:
If the container is cooled, the gas particles will lose kinetic energy and temperature will decrease.
If the gas particles move more quickly, they will collide more frequently with the walls of the container and pressure will increase.
If the gas particles move more quickly, they will collide with the walls of the container more often and with more force, and pressure will increase.
Explanation:
The temperature of gases is a measure of the average kinetic energy of the molecules. With increasing temperature comes more kinetic energy for the gaseous particles. If temperature of the system is reduced, the particles will have less kinetic energy and would not be able to move. Temperature is directly proportional to average kinetic energy.
Pressure of gases increases when there is more frequent collision between their particles. The usual case is for gases to move more rapidly as a result of increase in kinetic energy of the system. The particles collides more frequently with one another and the walls of the container if the kinetic energy is raised.
Answer:
If the container is cooled, the gas particles will lose kinetic energy and temperature will decrease.
If the gas particles move more quickly, they will collide more frequently with the walls of the container and pressure will increase.
If the gas particles move more quickly, they will collide with the walls of the container more often and with more force, and pressure will increase.
Explanation:
Express the product of 5.4mm and 6.02 mm using the correct number of significant digits.
A. 32mm^2
B. 33mm^2
C. 32.5mm^2
D. 32.51 mm^2
Answer:
B. 33 mm²
Explanation:
The language "product" means that we must multiply the numbers given to get our answer.
5.4 mm × 6.02 mm = 33 mm²
The significant figures rule for multiplication is that we must us the amount of significant figures in the number with the least significant figures, in this question this is 2 significant digits from 5.4 mm.
how to convert moles to molecules
Explanation:
To convert from moles to molecules we simply multiply the number of moles by Avagadro's number, 6.02 × 10²³.
For example if we have 1 mol of a substance we have 6.02 × 10²³ molecules of that substance.
1 mol × 6.02 × 10²³ = 6.02 × 10²³ molecules.
To convert moles to molecules, multiply the number of moles by Avogadro's number, which is 6.022 x 10²³ molecules/mole.
To convert moles to molecules, you need to use Avogadro's number. Avogadro's number is 6.022 x 10²³, which is the number of molecules (or atoms, ions) in one mole of a substance.
Here are the steps for the conversion:
First, identify the number of moles you want to convert.
Next, multiply the number of moles by Avogadro's number (6.022 x 10²³ molecules/mole).
For example, if you have 2 moles of a substance, the number of molecules is calculated as follows:
Molecules = Moles x Avogadro's number
Molecules = 2 moles x 6.022 x 10²³ molecules/mole
Molecules = 1.2044 x 10²⁴ molecules
So, 2 moles of a substance contain 1.2044 x 10²⁴ molecules.
Boron - 10 emits alpha particles and cesium - 137 emits beta particles. Write balanced nuclear
reactions for each radioactive decay.
The balanced nuclear reaction is:10/5 B → 4/2 He + 6/3 Li.The balanced nuclear reaction is:137/55 Cs → 137/56 Ba + 0/-1 e Where Ba stands for Barium.
The balanced nuclear reaction for Boron-10 emits alpha particles and cesium-137 emits beta particles are as follows:Balanced nuclear reaction for Boron-10:Boron-10 emits an alpha particle, which consists of two protons and two neutrons, therefore the atomic mass of Boron-10 decreases by four, and the atomic number decreases by two, resulting in the formation of a new atom i.e. Helium-4.
Balanced nuclear reaction for Cesium-137:Cesium-137 emits a beta particle which is an electron, and when a beta particle is emitted, a neutron inside the atom changes into a proton, resulting in the formation of a new atom with the same mass number, but an atomic number that has increased by one.
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Final answer:
The radioactive decay of Boron-12 by beta particle emission can be represented by the nuclear equation ⁵B¹² → ⁵C¹² + ⁰e⁻ + γ, resulting in Carbon-12 and a gamma ray. For Cesium-137, the decay is represented by ⁵⁵Cs¹³⁷ → ⁵⁶Ba¹³⁷ + ⁰e⁻, producing Barium-137 and a beta particle.
Explanation:
The student's question requires writing balanced nuclear equations for the radioactive decay of Boron-10 and Cesium-137. However, the question has an error since Boron-10 does not usually emit alpha particles, so we will correct it to Boron-12, which undergoes beta decay:
Boron-12 emitting a beta particle and a gamma ray can be represented as:
⁵B¹² → ⁵C¹² + ⁰e⁻ + γ
In this equation, Boron-12 ( ⁵B¹² ) decays to Carbon-12 ( ⁵C¹² ) by emitting a beta particle (⁰e⁻) and a gamma ray (γ). The gamma ray represents the release of excess energy after the decay.
For Cesium-137 undergoing beta decay, the equation is as follows:
⁵⁵Cs¹³⁷ → ⁵⁶Ba¹³⁷ + ⁰e⁻
In this equation, Cesium-137 (⁵⁵Cs¹³⁷) decays to Barium-137 (⁵⁶Ba¹³⁷) by emitting a beta particle (⁰e⁻).
Two jars are placed on a counter with a McDonald's French Fry inside, one has a lid, the other does not. They are left alone to see which one decays faster, after 2 days the fry in the closed jar looks fresher. What is the independent variable? What is the dependent variable? What is the control variable?
Freshness of french fries is dependent variable , time is independent variable,jar is controlled variable.
What are variables?
Variables are defined as any characteristics, number or quantity which can be measured . It can also be called as a data item . It is called as variable because they can vary and can have variety of values.
There are three types of variables 1) manipulated variable where in a condition is specified, 2) responding variable which is dependent on manipulated variable 3)controlled variable which do not change
Example of manipulated variables are number of hours spent by a student studying , that of responding variable is result of a student and temperature is an example of controlled variable.Variables are useful in analysis of variables.
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The plutonium isotope with 144 neutrons
Enter the chemical symbol of the isotope.
Answer:
Explanation:
Plutonium is a radioactive element belonging to the actinide series on the peroidic table. It is located on the f-block.
The isotope of plutonium with a neutron number of 144 can be expressed below:
²³⁸₉₄Pt
238 is the mass number of the isotope
94 is the atomic number
Pt is the symbol of this isotope.
The mass number is the sum of the protons and neutrons in the nucleus of the atom of an element. Here, the number of protons is 94 and it is the same as the number of electrons. Since the given number of neutrons is 144, combining them gives 238 as the value of the mass number.
The atomic number is the number of protons in the atom which is 94.
How many kilograms of HF are needed to react with 3.76kg of UO2
Answer:
1.115 Kg of HF needed to react with UO₂.
Explanation:
Given data:
Mass of UO₂ = 3.76 Kg (3.76× 1000 = 3760 g)
Mass of HF = ?
Solution:
First of all we will write the balance chemical equation.
UO₂(g) + 4HF(g) → UF₄ (g) + 2H₂O(l)
Now we will calculate the number of moles of UO₂.
Number of moles = mass / molar mass
Molar mass of UO₂ = 270.03 g/mol
Number of moles = 3760 g / 270.03 g/mol = 13.9244 mol
Now we will compare the moles of HF and UO₂ from balance chemical equation.
UO₂ : HF
1 : 4
13.9244 : 4×13.9244 = 55.7 mol
Mass of HF = number of moles × molar mass
Mass of HF = 55.7 mol × 20.01 g/mol
Mass of HF = 1114.56 g
In kilogram:
1114.56 / 1000 = 1.115 Kg
Convert: 127 degrees Celsius = ______K -400 127 400 146 -146
Answer:
400.15 kelvin
Explanation:
What happens to the temperature of a substance while it is changing state? Explain.
Answer:
the temperature of a substance while changing often times while rise or fall depending on what is happening. Say you have an ice cube and you put it into a hot soup to cool the soup down the ice cube melts due to the surrounding temperature. In other cases if you want to cool something hot like say hot water you can 1:put it in a cool place such as a refrigerator or freezer or 2:you can leave it out to cool to room temperature.
If something I said didnt make sense plz dont get mad or anything I am only in jr.high in 8th grade and the school year is still fresh so I'm trying to catch up on somethings.
Answer:
When any substance changes its state, the temperature remains constant.
Explanation:
It happens so because the amount of heat supplied during the change of state of any substance is utilized to break the intermolecular forces of attraction or other kinds of forces.
What is the SI unit of time?
A. second
B. minute
C. hourD.
day
The answer is option A "second." The SI unit of time is a second other units of measure consist of mass, metre, temperature, and kilogram. A second is how you measure time because how 60 seconds equal a minute, 60 minutes equal a hour, 24 hours equal a day then so on.
Hope this helps.
What is the next step if the data from an investigation do not support the original hypothesis? The hypothesis is revised and another experiment is conducted. The data are incorrect and the experiment is run again. The data are revised to support the hypothesis. The data are adjusted to match the observations.
If the data from an investigation do not support the original hypothesis, the correct next step is to revise the hypothesis and perform another experiment. Data is not manipulated to fit the hypothesis; instead, the hypothesis is adapted based on the objective data collected. The goal is to advance knowledge through a reliable scientific process.
When the data from an investigation do not support the original hypothesis, the appropriate next step is to revise the hypothesis and conduct a new experiment. It is essential to understand that manipulating data to fit a hypothesis is not a valid scientific practice. Instead, the hypothesis must be adjusted to reflect the reality of the data collected. This iterative process of hypothesis testing is at the core of the scientific method, which values objectivity and systematic investigation whether in a laboratory setting or through natural observation.
Experiments are tools for gathering objective data to determine whether a hypothesis is supported or refuted. If the data do not support the hypothesis, this does not imply that the data are incorrect. Rather, it may indicate that the hypothesis needs to be revised. The new hypothesis should then be tested with a fresh experiment, furthering our understanding of the phenomenon under study.
Ultimately, the goal is not to force the data to fit preconceived notions but to let the data guide the development of credible scientific theories. This process contributes to the advancement of knowledge in the field and ensures that scientific findings are reliable and can be built upon.
Which of the following is a homogeneous mixture?
Answer:
Salt Water
Explanation:
A substance is homogeneous if its composition is identical wherever you sample it - it has uniform composition and properties throughout. Homogeneous is Latin for the same kind. If a substance is not homogeneous, it is said to be heterogeneous.
“A mixture is the chemical bonding of two or more substances in any proportion.” Is this statement true or false? Explain your answer.
Answer:
False
Explanation:
''A mixture is the chemical bonding of two or more substances in any proportion'' is false statement because a mixture don't include bonding of chemical substances.
Mixtures in chemistry are including blending of substances and we have two tipes of mixture:
HeterogeneousHomogeneousSome of the chemical mixtures are: mixture of water and sand, mixture of sand and iron filings and more...
If we are talking about bonding in chemistry there are Covalent bonds and Ionic bonds.
Answer:
The statement is False.
Explanation:
A mixture contains two or more elements present in it.
The elements are not in chemical combination with each other.
A compound too contains two or more elements but they are in chemical combination.
For example NaCl is a compound which contains 1 part of Sodium and 1 part of Chlorine.
[tex]H_2 O[/tex] is a compound 2g of hydrogen is chemically combined with 16g of Oxygen.
Chemical bonding is the attractive forces which holds the atoms together in a molecule.
NaCl - the attractive force is called as Ionic bond.
[tex]H_2 O[/tex] - the bond present is a covalent bond
A mixture has two or more elements but there is no chemical bonding present in it. The components of a mixture can be easily separated from it.
If a light ray strikes a flat mirror at an angle of 27 degrees, what will the reflected ray be?
30 degrees from the mirror's surface
pretty sure It's correct and if it is then your welcome
The concept law of reflection is used here to find out the angle of reflected ray. The angle of reflected ray is also 27 degree. The light reflected from a mirror surface is an example of reflection of light.
What is Law of reflection?The law of reflection states that the angle of reflection is always equal to the angle of incidence. Here the incident ray, reflected ray and the normal to the surface of the mirror is found to lie in the same plane.
A common reflected image is given by the the law of reflection where the distance between the object and the mirror is same as that of the distance between the image and the mirror.
The law of reflection can be shown here.
Thus the angle of reflected ray is 27 degree which is same as that of incident angle.
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WHAT HAPPENS TO HOT AIR?
Answer:
Hot air rises
Explanation:
Hot air rises because when you heat air (or any other gas for that matter), it expands. When the air expands, it becomes less dense than the air around it. The less dense hot air then floats in the more dense cold air much like wood floats on water because wood is less dense than water.
Question 1(Multiple Choice Worth 2 points)
(01.03 MC)
Complete this sentence. If mass remains the same while the volume of a substance
the density of the substance will
decreases, increase
increases, increase
increases, stay the same
decreases, stay the same
Next Question
0
Question 1 (Not Answered)
^QE 9/11
Previous Question
Answer:
The answer is: If mass remains the same while the volume of a substance decreases, the density of the substance will increase.
Explanation:
Let's make an example:
If we have a wood block that's 1 kg, and the volume of the block is 1 cubic meter, that means that we have a wood block with a density of 1 kg/m3. If we now decrease the volume down to 0.2 cubic meters, while the mass stays at 1 kg, we suddenly have a change of density. Why?
If we now try to increase the volume of the wood block, with the mass increased as well, equal to the amount of increased volume, to get to 1 m3, we need to increase the size of the wood block 5 times, meaning the mass increases 5 times. So, we have now a wood block with a volume of 1 cubic meter and 5 kg, which leaves us with a density of 5 kg/m3, which is, again, 5 times higher than we started with.
The periodic table is divided into metals, non-metals and metalloids. Where are the non-metals located?
the right side of the periodic table
the middle of the periodic table
the left side of the periodic table
the bottom of the periodic table
They are located on the right side of the periodic table. Metals are located on the left side of the periodic table.
Hope that helps!!
Select the correct answer.
An ion has a net charge of 3+. If this ion has 8 protons, how many electrons does it have?
Answer 12
Explanation:
Answer:
Ion formed from the atom contains 8 positive protons and 5 negative electrons
Explanation:
Atomic number = number of electrons = number of protons
So the atom contains 8 protons and 8 electrons
Protons are positively charged and electrons are negatively charged.
An ion with a positive charge (cation) is formed by the loss of negative electrons
An ion with a negative charge (anion) is formed by the gain of negative electrons.
The question says ion has a net charge of 3+ so it means the atom has lost 3 electrons from it.
So ion formed from the atom contains 8 positive protons and 5 negative electrons (Answer)
To find the number of neutrons we make use of the formula
Please Note: Mass number - atomic number = number of neutrons
Write a balanced chemical equation for the decomposition of RbNO3.
Help me please!!!
Answer:
2RbNO³ --> 2Rb + N² + 30²
Hope this helps!
The decomposition of RbNO3 can result in different products depending on the reaction conditions, and alkali metal nitrates typically decompose into their metal oxides, nitrogen dioxide, and oxygen. For an accurate balanced equation, specific details regarding the decomposition conditions are necessary.
Explanation:The decomposition of RbNO3 (rubidium nitrate) would lead to the formation of rubidium nitrite (RbNO2) and oxygen (O2). However, typical nitrates of alkali metals like rubidium do not decompose into nitrites and oxygen as do nitrates of heavier metals; instead, they usually decompose into the nitrate's corresponding metal oxide, nitrogen dioxide, and oxygen. Therefore, since this behavior can be complex and context-dependent, I would need more specific information about the conditions of the decomposition to provide a precise equation.
Let's take a more generic example for illustrative purposes:
Decomposition of potassium chlorate: 2 KClO3 → 3 O2 + 2 KCl.In case of RbNO3, if we were to speculate a similar simple decomposition, a balanced chemical equation might be:
2 RbNO3 → 2 RbNO2 + O2.
However, this is just a hypothetical example and should not be taken as the actual decomposition of rubidium nitrate. Understanding the decomposition of such compounds requires knowledge of the specific conditions under which the reaction occurs.
Laws differ from theories because laws do not provide
A. a hypothesis
B. a description
C. an explanation
D. a statement
Answer:
C. An explanation
Both artists and scientists contribute to our understanding of the world around us. Identify the ways that art and science are similar. Check all that apply.
Both artists and scientists use their imagination to create things.
Both artists and scientists rely on others in their field for inspiration.
Both artists and scientists can modify their work whenever necessary.
Both artists and scientists use technological innovations to explore new possibilities.
answer are: a b and d on edunity
Answer:
The correct answer will be options-
1. Both artists and scientists use their imagination to create things.
2. Both artists and scientists rely on others in their field for inspiration.
3. Both artists and scientists use technological innovations to explore new possibilities.
Explanation:
The artist and scientist share many common features related to their philosophy and exploration.
Both artist and scientist acquire new ideas and talent by the previous work done by experts in their fields. They take inspiration from them to do new work.
An artist creates a new piece of work by imagination like a painter which is also used by the scientist to think new ideas in a scientific investigation like the theory of relativity was based on the logical imagination.
An artist and a scientist use the new technologies to advance their work in their respective fields and thus, the selected options are the correct answer.
Answer:
1.) Both artists and scientists use their imagination to create things.
2.)Both artists and scientists rely on others in their field for inspiration.
4.)Both artists and scientists use technological innovations to explore new possibilities.
Explanation:
Correct on edge 2021
What do all eukaryotic cell have in common?
Answer: Eukaryotic cells are very diverse in shape, form and function. Some internal and external features, however, are common to all. These include a plasma (cell) membrane, a nucleus, mitochondria, internal membrane bound organelles and a cytoskeleton.
Explanation: Both prokaryotic and eukaryotic cells have structures in common. All cells have a plasma membrane, ribosomes, cytoplasm, and DNA. The plasma membrane, or cell membrane, is the phospholipid layer that surrounds the cell and protects it from the outside environment.
All eukaryotic cells have various common characteristics and structures such as -nucleus and other membrane-bound compartments or organelles that help in giving all of them a specialized function.
A eukaryotic cell is a type of cell that contains the nucleus and other membrane-bound compartments or organelles that help in giving all of them a specialized function.
Eukaryotic cells are very diverse in shape, form, and function.Common structures to all eukaryotes are -a plasma (cell) membranea nucleusmitochondriainternal membrane-bound organelles such as ER, Golgi apparatus, vacuole, ribosomes, and a cytoskeletonDNA as genetic materialcytoplasmThus, All eukaryotic cells have various common characteristics and structures such as - nucleus and other membrane-bound compartments or organelles that help in giving all of them a specialized function.
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Mass of sodium + nitrogen +oxygen+ oxygen+ oxygen =
Answer:
Oxygen's atomic weight is 16.00 amu. 1 mole of oxygen is 6.02 x 1023 atoms of oxygen 1 amu = 1.661 x 10-24g What is the molar mass (g/mole) of oxygen? Molar mass (in grams) is always equal to the atomic weight of the atom!
Explanation:
i looked it up ok
Answer:
Mass of sodium + nitrogen +oxygen+ oxygen+ oxygen = =85 g/mol
Explanation:
Molar mass is the mass of 1 mole of the substance and its unit is g/mol
We find the molar mass by just adding atomic mass of the elements present in the chemical formula of the compound
For example
[tex]H_2 SO_4[/tex]
Atomic mass of H is 1.008 (approximately 1)
Atomic mass of S is 32
Atomic mass of O is 16
There are 2, H atoms 1, S atom and 4, O atoms
So, the molar mass of the compound [tex]H_2 SO_4[/tex] will be
[tex]\\$=[(2 \times 1)+(1 \times 32)+(4 \times 16)]$\\\\$=(2+32+64)=98 \frac{g}{m o l}$[/tex]
The question says 1, Na
1, N and
3, O
So the chemical formula we get is [tex]NaNO_3[/tex]
The molar mass of the compound [tex]NaNO_3[/tex] is
[tex]\\$=[(1 \times 23)+(1 \times 14)+(3 \times 16)]$\\\\$=(23+14+48)$[/tex]
=85 g/mol (Answer)
Triangle PQR has vertices at P(−6,−4) , Q(2,−10) , and R(8,0) . It is dilated about the origin by a scale factor of 5 to obtain triangle P′Q′R′ . What are the coordinates of the vertices of triangle P′Q′R′ ? Use the drop-down menus to choose the coordinates that make the statement true.
Answer:
P'(-30, -20), Q'(10, -50), R'(40, 0)
Explanation:
Multiply each coordinate by 5 to get your above answer.
I am joyous to assist you anytime.
The vertices of triangle PQR are dilated by a factor of 5 resulting in new vertices P′(-30,-20), Q′(10,-50), and R′(40,0).
Explanation:The given task is about a geometric transformation called dilation. In the game of dilation, each point moves closer to or further from the origin (0, 0) based on the scale factor. Here, the given triangle is dilated by a scale factor of 5. So, each coordinate of the triangle would be multiplied by that factor.
Let's calculate:
For point P(-6,-4), after dilation, it would be P'(-6*5, -4*5) => P'(-30, -20) For point Q(2, -10), it will transform into Q'(2*5, -10*5) => Q'(10, -50) For point R(8, 0), new coordinates will be R'(8*5, 0*5) => R'(40, 0)
Therefore, the coordinates of the vertices of triangle P′Q′R′ after dilation will be P′(-30,-20), Q′(10,-50), and R′(40,0).
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What affects the process of the water cycle?
DO NOT SAY DUMB THINGS LIKE THE LAST PERSON WHO ANSWERED MY QUESTION
Answer: hi
Explanation:
Consider a sample of calcium carbonate in the form of a cube measuring 2.805 in. on each edge.
If the sample has a density of 2.70 g/cm3 , how many oxygen atoms does it contain?
To find the number of oxygen atoms in a sample of calcium carbonate, calculate the number of moles of calcium carbonate and multiply by the number of oxygen atoms per molecule. The sample contains approximately 29.331 oxygen atoms.
Explanation:To determine the number of oxygen atoms in a sample of calcium carbonate, we need to know the number of moles of calcium carbonate and the formula of calcium carbonate. The formula for calcium carbonate is CaCO3, which means there is one calcium atom (Ca), one carbon atom (C), and three oxygen atoms (O) in each molecule of calcium carbonate.
First, we need to find the volume of the cube. The volume of a cube is given by V = s3, where s is the length of the sides of the cube. In this case, the length of the sides of the cube is 2.805 in. Therefore, the volume is V = 2.8053 = 22.124 in3.
Next, we need to convert the volume from cubic inches to cubic centimeters, as the density is given in g/cm3. Since 1 in3 = 16.3871 cm3, the volume in cm3 is 22.124 in3 * 16.3871 cm3/in3 = 362.274 cm3.
Finally, we can calculate the mass of the sample of calcium carbonate using the density formula: density = mass/volume. Rearranging the formula, mass = density * volume. Plugging in the values, mass = 2.70 g/cm3 * 362.274 cm3 = 978.780 g.
Now, we know the mass of the sample, which is equal to the molar mass of calcium carbonate multiplied by the number of moles. The molar mass of calcium carbonate (CaCO3) is calculated by adding the atomic masses of calcium, carbon, and three oxygen atoms: 40.08 g/mol + 12.01 g/mol + (3 * 16.00 g/mol) = 100.09 g/mol.
Using the equation: mass = molar mass * moles, we can solve for the moles of calcium carbonate in the sample. Rearranging the equation, moles = mass / molar mass. Plugging in the values, moles = 978.780 g / 100.09 g/mol = 9.777 mol.
Since there are three oxygen atoms in each molecule of calcium carbonate, the total number of oxygen atoms in the sample is calculated by multiplying the number of moles of calcium carbonate by the number of oxygen atoms per molecule: 9.777 mol * 3 = 29.331 oxygen atoms.
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What is the main difference between extensive and intensive physical properties?
Answer:
extensive properties depend on the amount of matter being used. intensive properties do not depend on the present substantive.
Explanation:
The quantity of materials in a sample determines whether a property is referred to as an extensive property. The type of matter in a sample, not the quantity, determines an intense attribute of matter.
What are physical properties?Physical properties are defined as the properties of matter that may be seen and measured without affecting the sample's chemical composition. Physical characteristics of substances and systems are frequently referred to as extensive and intensive characteristics.
Mass, weight, and volume are examples of extensive qualities that change depending on the amount of the substance. Contrarily, intensive qualities, such as color, melting point, boiling point, electrical conductivity, and physical state at a specific temperature, are independent of the amount of the substance present.
Thus, the quantity of materials in a sample determines whether a property is referred to as an extensive property. The type of matter in a sample, not the quantity, determines an intense attribute of matter.
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