Answer:
1. 44.11 g
2. 36.03 g
3. 8.08 g
4. 81.7%
5. 18.3%
Explanation:
1. 12.01+12.01+12.01+1.01+1.01+1.01+1.01+1.01+1.01+1.01+1.01=44.11
2. 12.01×3= 36.03
3. 1.01×8= 8.08
4.(36.03/44.11)×100= 81.7%
5. (8.08/44.11)×100= 18.3%
The molar mass of C3H8 is 44.094 g/mol. The carbon percent composition is 81.72% and the hydrogen percent composition is 18.28%.
Explanation:The molar mass of C3H8 (propane) can be calculated by adding up the atomic masses of the atoms in the molecule. Carbon has a molar mass of 12.01 g/mol, and there are 3 carbon atoms in C3H8, so the total molar mass for carbon atoms is 12.01 g/mol x 3 = 36.03 g/mol. Hydrogen has a molar mass of 1.008 g/mol, and there are 8 hydrogen atoms in C3H8, so the total molar mass for hydrogen atoms is 1.008 g/mol x 8 = 8.064 g/mol.
The percent composition can be calculated by dividing the molar mass for each element by the total molar mass of C3H8. The carbon percent composition is (36.03 g/mol / 44.094 g/mol) x 100% = 81.72%. The hydrogen percent composition is (8.064 g/mol / 44.094 g/mol) x 100% = 18.28%.
Andrew noticed that the plastic in his chair seat didn't feel as cold as the metal legs. What statement best explains this observation?
A) Plastic is an insulator, so it stores warmth in the room.
B) The metal absorbs cold air in the room at a faster rate than plastic.
C) Metal is a conductor of heat so it transmits warmth away from Andrew's hand at a faster rate than plastic.
D) Metal is a conductor of heat, so it transmits its heat to the plastic until the plastic reaches room temperature.
Answer:
Metal is a conductor of heat so it transmits warmth away from Andrew's hand at a faster rate than plastic.
Explanation:
remember, cold air never existed. only the lack of heat :)
I NEED HELP NOW YOU CAN TAKE ALL MY POINTS JUST PLEASE ANSWER AND MAKE SURE ITS GOOD!!!!!
Below is a solubility curve to help you answer the following questions.
Another student is attempting to make a saturated solution of KCl. The student added 30 g of KCl to 100 g of water at 60℃. What more does the student need to do to create a saturated KCl solution?
Claim: What more does the student need to do to create a saturated KCl solution?
Evidence: Use data from the solubility curve to identify the number of grams of KCl needed at 60℃ to create a saturated solution.
Reasoning: Use your knowledge of the relationship between temperature and solubility to explain how you determined the saturation level of the solution at the given temperature. Be sure to define the terms you used.
As the temperature is increased, the solubility of potassium chloride will increase as they are directly proportional.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.
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is a chemical released at a stressful time.
Oxygen
Glucose
Carbon dioxide
Adrenaline
Answer:
carbon dioxide
Explanation:
Answer:
Adrenaline
Explanation:
Adrenaline is a chemical released when you are in stress or, to coin it better, in "panic mode". It helps boost your stamina, and gears you towards flight in the fight v. flight response. However, when needed, you have that extra boost of stamina in case you do need to fight. Your blood pressure will rise, and your heart will beat faster, as well as you feeling your muscles tense up and body heating up.
Muscles perform what types of energy transformation?
a.) Kinetic to Potential
b.) Kinetic to Electrical
c.) Thermal to Radiant
d.) Chemical to Kinetic
Answer:
d
Explanation:
Inside of your muscles, there are fibers that are always ready to use your body's energy currency - ATP - and convert that into motion. Since they use ATP, which is a form of chemical energy, and turn it into motion, or kinetic energy, the correct answer is d. Hope this helps!
Final answer:
Option d) Muscles transform chemical energy into kinetic energy during contraction, using oxygen and food molecules to perform work and produce motion.
Explanation:
During muscle contraction, the potential energy stored in the form of chemical bonds in food molecules and oxygen is transformed into the kinetic energy of motion as the muscles do work. This can be observed through the consumption of oxygen and nutrients, the production of waste products like carbon dioxide, and the release of heat.
Moreover, the transformation of energy in muscles also results in an increased blood supply to bring nutrients and oxygen to the muscle cells efficiently and to carry away waste products.
The correct answer to the question 'Muscles perform what types of energy transformation?' is (d) Chemical to Kinetic.
What is the mass percent of Iron in Iron III Carbonate? *
Answer:
what im lost
Explanation:
Final answer:
The mass percent of iron in Iron (III) Carbonate is calculated by dividing the molar mass of iron by the total molar mass of the compound and then multiplying by 100%, resulting in approximately 38.3%.
Explanation:
To find the mass percent of Iron in Iron (III) Carbonate (Fe₂(CO₃)₃), we first need to calculate the molar mass of the compound and then the molar mass of iron within it. The molar mass of Iron (III) Carbonate is obtained by adding together the molar masses of 2 moles of iron (Fe), 3 moles of carbon (C), and 9 moles of oxygen (O). The molar mass of Fe is approximately 55.85 g/mol, that of C is about 12.01 g/mol, and O is approximately 16.00 g/mol.
To calculate the molar mass of Fe₂(CO₃)₃:
Molar mass of Fe: 2 × 55.85 g/mol = 111.7 g/molMolar mass of C: 3 × 12.01 g/mol = 36.03 g/molMolar mass of O: 9 × 16.00 g/mol = 144 g/molTotal molar mass = 111.7 g/mol + 36.03 g/mol + 144 g/mol = 291.73 g/mol
Next, we find the mass percent of Fe by taking the molar mass of Fe and dividing it by the total molar mass of the compound, then multiplying by 100% to convert it into a percentage:
Mass percent of Fe = (Molar mass of Fe / Total molar mass of compound) × 100% = (111.7 g/mol / 291.73 g/mol) × 100% ≈ 38.29%
Therefore, the mass percent of iron in Iron (III) Carbonate to three significant digits is approximately 38.3%.
Curious Carl and his lab partner added small pieces of various metals to HCl. Magnesium (Mg) and zinc (Zn) reacted vigorously with HCl, releasing hydrogen gas. This equation represents the reaction of zinc in hydrochloric acid.
Zn + 2HCl → ZnCl2 + H2
What is the half reaction for the reduction of hydrogen in the reaction?
A) 2HCl → + 2e- + H2(g)
B) H + Cl → + 2e- + H2(g)
C) 2H+ + 2e- → H2(g)
D) 2H+ - 2e- → H2(g)
Answer:
I just took it on use test prep. the answer is C. 2H + 2e → H2(g)
Answer:B
Explanation:USA test prep
round 23,455 into 4 significant figures: ______ cm 23.46
23.40
23.45
Answer:
23.46
Explanation:
Carlos stomps a soda con flat and throw it away. Which of the following statements BEST describes the change made in the soda can?
The soda can kept the same mass as it changed in shape only
The soda can lost mass as it was changed into a smaller size
The soda con gained more moss because its shape changed
The soda can lost mass as it was crumpled and changed form
Answer:
The soda can kept the same mass as it changed in shape only
Explanation:
Law of Conservation states "mass cannot be created or destroyed" therefore this is why the mass hasn't changed, but when it was smashed the shape changed.
Final answer:
The soda can's mass remains the same after being stomped and flattened, as no matter is added or removed during this physical change, which is explained by the Law of Conservation of Mass.
Explanation:
The statement that best describes the change made in the soda can after Carlos stomps on it is that the soda can kept the same mass as it changed in shape only. This is explained by the Law of Conservation of Mass, which states that the mass of a closed system of substances will remain constant, regardless of the processes acting inside the system. Therefore, even though Carlos changed the can's shape by stomping on it, he did not add or remove matter from the can, so its mass remained unchanged. This principle is crucial in chemistry and holds true for both physical changes, like changing the shape of a can, and chemical changes, where substances may change form but the total mass remains constant.
Which is NOT one way used to collect empirical evidence?
A. Sight
B. Taste
C. Extra sensory perception
D. Hearing
Final answer:
Extra sensory perception is not a method used to collect empirical evidence. Empirical data is typically gathered using the five senses: hearing, sight, taste, touch, and smell.
Explanation:
The correct answer to the question of which method is NOT used to collect empirical evidence is C. Extra sensory perception. Empirical evidence is data and information obtained through observation and experimentation, and is typically gathered using the five senses: hearing, sight, taste, touch, and smell. Each of these senses provides a different type of sensory input or information about the world around us, enhancing our understanding and facilitating the collection of empirical data. For example, sound information through hearing can be used to perceive and analyze waves, taste information helps in food and chemical analysis, while smell information plays a role in the detection of substances. Extra sensory perception, however, is not a scientifically recognized or reliable method for collecting empirical evidence.
How many liters of 1.20 M calcium nitrate are required to produce .1 moles of calcium sulfate? Please balance the equation before solving the problem.
Answer:
0.083L
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
Ca(NO3)2 + H2SO4 —> CaSO4 + 2HNO3
Next, we shall determine the number of mole of Ca(NO3)2 needed to produce 0.1 mole of CaSO4.
From the balanced equation above,
1 mole of Ca(NO3)2 reacted to produce 1 mole of CaSO4.
Therefore, 0.1 mole of Ca(NO3)2 will also react to produce 0.1 mole of CaSO4.
Finally, we can determine the volume of Ca(NO3)2 needed for the reaction as follow:
Mole of Ca(NO3)2 = 0.1 mole
Molarity of Ca(NO3)2 = 1.20M
Volume =?
Molarity = mole /Volume
Volume = mole /Molarity
Volume = 0.1/1.2
Volume = 0.083L
Therefore, 0.083L of Ca(NO3)2 is needed for the reaction.
What type of energy does a rock resting on top of the hill have?
A. Electoral energy
B. Kinetic energy
C. Potential energy
D. Radiant energy
List 3 things that happen at the endpoint or equivalence point.
The equivalence point is the point in a titration where the amount of titrant added is enough to completely neutralize the analyte solution. The moles of titrant (standard solution) equal the moles of the solution with unknown concentration. ... The equivalence point is not the same as the endpoint of a titration.
1.
The ___________ energy in a mechanical system is determined by adding the potential and kinetic energy together.
total
massive
2.
The initial ___________ energy is equal to zero because the starting point is set at zero height to make things easier.
kinetic
potential
3.
In the example, the final kinetic energy is determined to be ___________ because at the peak height, the ball instantaneously stops.
positive
zero
negative
4.
In this system, potential and kinetic energy are ________________ proportional.
inversely
directly
Answer:
1. total
2. potential
3. zero
4. inversely
Explanation:
The total energy in a mechanical system is determined by adding the potential and kinetic energy together. The initial potential energy is equal to zero because the starting point is set at zero height to make things easier.
What is mechanical energy ?The sum of kinetic energy and potential energy in an object is called its mechanical energy. Therefore, the first statement is completed as:
The total energy in a mechanical system is determined by adding the potential and kinetic energy together.
The initial potential energy is equal to zero because the starting point is set at zero height to make things easier. In the example, the final kinetic energy is determined to be zero because at the peak height, the ball instantaneously stops.
In this system, potential and kinetic energy are inversely proportional to each other. Because, as the kinetic energy increases with a decrease in potential energy.
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How many moles of gas are contained in 890.0 mL at 21.0 °C and 750.0 mm Hg pressure?
Answer:
(0.9868 atm)(0.89 L) = (x)(0.0821 L-atm)(294 K)
0.87825 = (x) 24.1374
x = 0.03638 moles :)
Explanation:
Given the value of the temperature and the pressure, the amount of the ideal gas contained in the given volume is 0.036mol.
Ideal Gas Law
The Ideal gas law or general gas equation emphasizes on the state or behavior of a hypothetical ideal gas. It states that "the pressure multiplied by volume is equal to moles multiply by the universal gas constant multiply by temperature.
It is expressed as;
PV = nRT
Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant ( 0.08206 Latm/molK )
Given the data in the question;
Volume of gas V = 890.0 mL = 0.89LTemperature T = 21.0°C = 294.15KPressure P = 750.0mmHg = 0.986842atmAmount of gas n = ?To determine the amount of gas, we substitute our values into the expression above.
PV = nRT
n = PV / RT
n = ( 0.986842atm × 0.89L ) / ( 0.08206 Latm/molK × 294.15K )
n = 0.87828938Latm / 24.137949Latm/mol
n = 0.036mol
Therefore, given the value of the temperature and the pressure, the amount of the ideal gas contained in the given volume is 0.036mol.
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Which compound will conduct electricity when it is dissoved in water
CHA
Cusos
Citos
Answer:
Electrolyte Solutions
An electrolyte is any salt or ionizable molecule that, when dissolved in solution, will give that solution the ability to conduct electricity. This is because when a salt dissolves, its dissociated ions can move freely in solution, allowing a charge to flow.
Explanation:
Answer:
C. CuSO4
Explanation:
Trust
Which answer choice correctly describes the gas law and physical changes represented by the image?
a. The image shows Boyle’s law because volume increases as pressure increases.
b. The image shows Boyle’s law because volume decreases as pressure increases.
c. The image shows Charle’s law because volume decreases as pressure increases.
d. The image shows Charle’s law because as volume increases as pressure increases.
Answer:
A. The image shows Boyle's Law because volume decreases as pressure increases.Explanation:
According to Boyle's Law, at constant temperature, pressure and volume have inverse relation that is as pressure would increase, volume would decrease.
According to Charles Law, at constant pressure, the volume is directly proportional to temperature.
According to the given graph and diagram, the temperature is constant and volume and pressure have inverse relation.
Thus, option A is correct.
Jill is studying the temperature output of an ammonium chloride hand warmer. What apparatus will best help her monitor the
temperature change of the reaction?
calorimeter
colorimeter
hydrometer
thermometer
Answer:
Thermometer
Explanation:
Because a thermometer helps to measure temperatures
Answer:
calorimeter
Explanation:
hope this helps :)
13. What instrument is used routinely to check a person's exposure to radiation?
Geiger counter
scintillation counter
film badge
moderating rod
Sand dunes protect beaches against erosion and flooding due to storms.
Which human activity would have the most negative impact on dune grasses and the coast?
driving vehicles along the beach
building houses near the beach
walking on the dunes of the beach
allowing kids to play on the beach
Answer:
B. Building houses near the beach
Explanation:
it was right on edge
Sand dunes protect beaches against erosion and flooding due to storms. Building houses near the beach human activity would have the most negative impact on dune grasses and the coast. Therefore, option B is correct.
What is erosion ?The process of removing soil, rock, or dissolved material from one area on the Earth's crust and moving it to another, where it is deposited, is known as erosion. Erosion differs from weathering, which is a static process.
When dirt is exposed to high winds, heavy rains, and moving water, soil erosion primarily takes place. Some human activities, particularly farming and clearing land, make soil more prone to erosion.
Beyond the loss of agricultural land, soil erosion has other negative repercussions. In streams and rivers, it has increased pollution and sedimentation, blocking these waterways and resulting in a loss in fish and other species. Additionally, deteriorated soils are frequently less able to retain water, which can make floods worse.
Thus, option B is correct.
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The weight of the atmosphere is called what?
A. Wind
B. Gravity
C. Air pressure
D. Temperature
Answer:
The correct answer is C. Air pressure. :)
Explanation:
Air preasure is the amount of gravitational force acting against an object.
PLEASE HELP!!!!!!!!!
The pressure in an automobile tire is 1.88 atm at 25.0 degrees Celsius. What
will be the pressure if the temperature warms up to 37.0 degrees Celsius?
Assume the volume and the amount of the gas are constant. *
a. 1.81 atm
b. 2.78 atm
c. 1.96 atm
d. 1.27 atm
Answer:
Option "C" is the correct answer to the following question.
Explanation:
Given:
Pressure in an automobile tire (P) = 1.88 atm
Temperature (K) = 25°C = 273 + 25 = 298 Kelvin
New temperature (K1) = 37°C = 273 + 37 = 310 Kelvin
Find:
New pressure in an automobile tire (P1) = ?
Computation:
[tex]\frac{P}{K}= \frac{P1}{K1} \\\\\frac{1.88}{298}= \frac{P1}{310}\\\\1.9557[/tex]
New pressure in an automobile tire (P1) = 1.9557
New pressure in an automobile tire (P1) = 1.96 (Approx)
vanuation Question
1. What is the number one killer of teenagers?
O Speeding
Reckless driving
Driving under the influence
O Distracted driving
Why do we not see a lunar
and solar eclipse every
month
A. The moon orbits around Earth at a different angle than the Earth orbits around the Sun
B. The moon takes longer than 1 month to
orbit
C. Mars interferes with the alignment of the
moon, Earth and Sun
D. All of the above
Answer:
The moon's path around Earth is tilted compared to Earth's orbit around the sun. The moon can be behind Earth but still get hit by light from the sun. In this diagram, you can see that the moon's orbit around Earth is at a tilt. This is why we don't get a lunar eclipse every month.
So, I think it is A.
Explanation:
I hope that helps. I don't know if it is right or wrong, but good luck :)
Calculate the mass of a liquid with a density of 2.5 g/mL and a volume of 15 mL.
Answer: 37.5g
Explanation:
To find mass you need to multiply density times volume
M=D*V
m=2.5*15
m=37.5g(only grams)
Here is something to help
Density=Mass/Volume
Volume=Mass/Density
Mass=Density*Volume
The mass of a liquid with a density of 2.5 g/mL and a volume of 15 mL is 37.5 g.
What is Density?Density may be defined as a type of physical property that significantly deals with the description of how much space an object or substance takes up with respect to the amount of matter in that object or substance.
In a more simple sense, it is characterized as the measurement of quantity or mass per unit of volume in a particular substance.
According to the question,
The mass of a liquid = ?
The volume of a liquid = 15mL.
The density of the liquid = 2.5 g/mL.
According to the formula,
Density = Mass/VolumeMass = Density × Volume = 2.5 × 15 = 37.5 g.Therefore, the mass of a liquid with a density of 2.5 g/mL and a volume of 15 mL is 37.5 g.
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does anyone know this?
Which value gives the number of particles in 1 mol of a substance? 6.02 Times. 1021 6.02 Times. 1022 6.02 Times. 1023 6.02 Times. 1024
Answer:
6.02 x10^23
Explanation:
just did it on edge
The value gives the number of particles in 1 mol of a substance is 6.02 Times. 1023. Therefore, option C is correct.
What is mol ?The International System of Units uses the mole (symbol: mol) as the unit of material quantity. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that material. It is specified that the mole contains exactly 6.022 * 1023 elementary entities.
The mole, often known as mol, is a SI unit that counts the particles in a given substance.One mole is equal to 6.02214179×1023 atoms, or other elementary units such as molecules.
Avogadro's number is another name for this number. Keep in mind that a mole is defined as a quantity of stuff. A mole is the amount (10) of material containing 6.02214 × 1023 particles. 1 mol = 6.02214 × 1023 particles.
Thus, option C is correct.
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Why is water from an aquifer more likely to be cleaner than water from other sources?
Select one:
because it rises to the surface near the ocean
because pollutants are filtered by rock and soil deep within Earth
because it receives water directly from precipitation
because it forms where fresh and salt water meet
Answer:
last one
Explanation:
Answer:
2nd one
Explanation:
Is the following equation balanced? SO3 + 2H2O H2SO4 no yes
Answer: No
Explanation: It's not balanced because four oxygen atoms in H2SO4, whereas there are 5 oxygen atoms in the reactants side. Also, there's more hydrogen atoms on the reactants side.
I hope this helps!
Answer:no
Explanation:
It's not balanced because four oxygen atoms in H2SO4
Choose the correct energy transformation for the burning of a piece of wood. A. heat energy to light energy B. light energy to heat energy C. chemical potential energy to heat energy D. heat energy to chemical potential energy
Answer:
C
Explanation:
In the case of burning wood, stored potential energy in the wood is released due to heating by other excited atoms.
Final answer:
The burning of wood transforms chemical potential energy stored in the wood into heat energy, making option C the correct answer.
Explanation:
The correct energy transformation for the burning of a piece of wood is chemical potential energy to heat energy. This process is an example of a chemical reaction where the chemical energy stored in wood's molecules is released as heat and light energy when the wood combusts.
The chemical potential energy stored in the bonds of the wood is released as heat and light during the combustion process. This chemical potential energy is converted into heat energy, which is evident through the warmth generated by the burning wood. Additionally, some of this energy may also be transformed into light, but the primary conversion is from chemical potential energy to heat.
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The emission of what type of particle from a nucleus will not cause a transmutation?
A) positron
B) proton
C) neutron
D) alpha particle
Answer:
the answer is c
Explanation: