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-What is the mole fraction of Nitrogen? A. 0.056 B. 0.167 C. 0.667 D. 0.611 E. 0.733 -What is the mole fraction of carbon dioxide A. 0.056 B. 0.067 C. 0.256 D. 0.667 E. 0.757 -What is the mole fraction of Oxygen? A. 0.167 B. 0.267 C. 0.278 D. 0.467 E. 0.578

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-What is the mole fraction of Nitrogen? A. 0.056 B. 0.167 C. 0.667 D. 0.611 E. 0.733 -What is the mole fraction of carbon dioxide A. 0.056 B. 0.067 C. 0.256 D. 0.667 E. 0.757 -What is the mole fraction of Oxygen? A. 0.167 B. 0.267 C. 0.278 D. 0.467 E. 0.578

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The chemical formula for naphthalene is C10H8. It’s used to make mothballs and pesticides. In 4C10H8, the coefficient is blank , the subscript of carbon is blank , and the subscript of hydrogen is blank

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Explanation:

Naphthalene has chemical formula as C_{10}H_{8} and it is an organic compound. It is used as mothballs and pesticides because it has a very characteristic odor which can be found at very low concentrations.

The given naphthalene molecule is 4C_{10}H_{8}. Therefore, it can be described as follows.

  • The coefficient is 4.
  • Subscript of carbon is 10.
  • Subscript of hydrogen is 8.

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The chemical formula of lithium carbonate is Li2CO3. Which statement below best describes the types and number of atoms of each element making up this substance? A. Two lithium atoms; one calcium atom; one oxygen atom B. One lithium atom; three carbon atoms; three oxygen atoms C. One lithium atom; one carbon atom D. Two lithium atoms; one carbon atom; three oxygen atoms

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The chemical formula of lithium carbonate is Li2CO3. Which statement below best describes the types and number of atoms of each element making up this substance? A. Two lithium atoms; one calcium atom; one oxygen atom B. One lithium atom; three carbon atoms; three oxygen atoms C. One lithium atom; one carbon atom D. Two lithium atoms; one carbon atom; three oxygen atoms

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If 5.0 liters of carbon dioxide gas are produced by the reaction below at STP, how many liters of oxygen gas were used in the reaction? 2CO (g) + O2 (g) yields 2CO2 (g) 10.0 L 7.5 L 5.0 L 2.5 L

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If 5.0 liters of carbon dioxide gas are produced by the reaction below at STP, how many liters of oxygen gas were used in the reaction? 2CO (g) + O2 (g) yields 2CO2 (g) 10.0 L 7.5 L 5.0 L 2.5 L

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I WILL RATE BRAINLIEST I JUST NEED HELP!!!! In a reaction, 15 moles of carbon dioxide are produced from 5 moles of iron (III) oxide and 15 moles of carbon monoxide. What is the mole ratio of carbon dioxide to carbon monoxide? I am completely lost on this…

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I WILL RATE BRAINLIEST I JUST NEED HELP!!!! In a reaction, 15 moles of carbon dioxide are produced from 5 moles of iron (III) oxide and 15 moles of carbon monoxide. What is the mole ratio of carbon dioxide to carbon monoxide? I am completely lost on this…

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Air tiny air sacs through which oxygen and carbon dioxide pass in the and out of the bloodstream

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Air tiny air sacs through which oxygen and carbon dioxide pass in the and out of the bloodstream

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I WILL RATE BRAINLIEST!!!!! NEEED HELP PLEASEEEEE What is the mole ratio of water to carbon dioxide in the following equation?C3H8 + 5O2 3CO2 + 4H2O 6:8 4:3 7:9 8:6 I cannot figure this one out…

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I WILL RATE BRAINLIEST!!!!! NEEED HELP PLEASEEEEE What is the mole ratio of water to carbon dioxide in the following equation?C3H8 + 5O2 3CO2 + 4H2O 6:8 4:3 7:9 8:6 I cannot figure this one out…

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In the carbon cycle, decomposition is the breakdown of a substance into simpler substances. What is the name for the process of the nitrogen cycle that produces ammonia?

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In the carbon cycle, decomposition is the breakdown of a substance into simpler substances. What is the name for the process of the nitrogen cycle that produces ammonia?

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Which of the following is an example of a scientific question that is not testable? Why is the sky blue? How moist should soil be for a tomato seed to sprout? Is the strength of steel related to the amount of carbon in it? Does the rate of cooling of a liquid depend upon its initial temperature?

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Which of the following is an example of a scientific question that is not testable? Why is the sky blue? How moist should soil be for a tomato seed to sprout? Is the strength of steel related to the amount of carbon in it? Does the rate of cooling of a liquid depend upon its initial temperature?

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An anthropologist finds bone that her instruments measure it as 0.717% of the amount of carbon-14 the bones would have contained when the person was alive. How long ago did the person die? The half life of carbon 14 is 5,730 years. Round your answer to the nearest thousand . ****PLEASE HELP****

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The relationship for radioactive decay is given by:

N(t) = N₀ * exp(-kt), where k is the decay constant.

We may substitute k using the equation:
k = 0.693 / t₀.₅, where t₀.₅ is the half life of the substance

The equation becomes:

N(t) = N₀ * exp(-0.693t / t₀.₅)

The ratio of N(t) : N₀ is 0.717%, or 0.00717. Using this

0.00717 = exp(-0.693t / 5,730)

0.693t = 28,294
t = 40,828.3

The person was alive almost 41,000 years ago.

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How does cellular respiration explain why animals breathe rapidly when they are running? Energy is used up while running, and cellular respiration needs oxygen to produce more energy. Energy is used up while running, and cellular respiration needs carbon dioxide to produce more energy. Glucose is used up while running, and cellular respiration needs oxygen to make glucose. Glucose is used up while running, and cellular respiration needs carbon dioxide to make glucose.

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Answer is: Energy is used up while running, and cellular respiration needs oxygen to produce more energy.

Cellular respiration creates an energy molecule when glucose is broken down.

Balanced chemical reaction for cellular respiration (convert biochemical energy):  

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy, or:

glucose + oxygen → carbon dioxide + water + energy .

Carbon dioxide and water are released during cellular respiration.

This reaction is exothermic (energy is released).

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Which is a product of the cellular respiration reaction? glucose carbon dioxide blood cells

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Which is a product of the cellular respiration reaction? glucose carbon dioxide blood cells

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A sample of carbon dioxide gas, co2 (g), occupies a volume of 5.75 l at 0.890 atm. if the temperature and the number of moles remain constant, calculate the volume when the pressure a. increased to 1.25 atm b. decrease to 0.350 atm

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According to Boyle’s law;
P1V1 = P2V2
P1 is the pressure of the gas in the first case.
V1 is the volume of the gas in the first case.
P2 is the pressure of the gas in the second case.
V2 is the volume of the gas in the second case.

P1 = 0.890 atm, V1 = 5.75l

a. P2 = 1.25 atm, 
0.890*5.75 = 1.25*V2
V2 = 4.094 l

b. P2 = 0.350 atm,
0.890*5.75 = 0.350*V2
V2 = 14.621 l.

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Carbon dioxide enters the blood at the _____________________ capillaries. here, some of the carbon dioxide binds to the _____________ region of hemoglobin.

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Answered by answersmine AT 22/10/2019 – 05:00 AM

Carbon dioxide enters the blood at the systemic capillaries. Here, some of the carbon dioxide binds to the globin region of hemoglobin. The systemic capillaries function to carry oxygenated blood for the tissues of the body. As it enters these capillaries, blood would lose oxygen and in return gain CO2 molecules due to the difference in pressure of the tissues and the blood.

Post your answer

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How is the bulk of carbon dioxide transported in blood?

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How is the bulk of carbon dioxide transported in blood?

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Determine the empirical formula for a compound that is 70.79% carbon, 8.91% hydrogen, 4.59% nitrogen, and 15.72% oxygen.

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Determine the empirical formula for a compound that is 70.79% carbon, 8.91% hydrogen, 4.59% nitrogen, and 15.72% oxygen.

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Which best describes the role of carbon in the body?

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25) Answer is: less metallic and more nonmetallic.

Electronegativity increases from left to right across a period, atoms have tendency to attract electrons.

Electronegativity (χ) is a property that describes the tendency of an atom to attract a shared pair of electrons.

26) Answer is: radioisotope.

Radioisotope has an unstable atomic nucleus and emit energy and particles when it changes to a more stable form.

Francium (Fr) is element with atomic number 87 (87 protons and 87 electrons).

27) Answer is: boils.

Boiling is the temperature at which the vapour pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding atmosphere.

The Celsius scale was based on 0°C for the freezing point of water and 100°C for the boiling point of water at 1 atm pressure.

28) Answer is: endothermic.

There are two types of reaction:  

1) endothermic reaction (chemical reaction that absorbs more energy than it releases, ΔH>0).

2) exothermic reaction (chemical reaction that releases more energy than it absorbs).  

For example, the breakdown of ozone is an endothermic process. Ozone has lower energy than molecular oxygen (O₂) and oxygen atom, so ozone need energy to break bond between oxygen atoms.  

29) Answer is: kinetic.

The average kinetic energy of molecules depends on the temperature.  

As temperature increases, molecules gain more energy from surrounding and move faster.  

Kinetic energy (standard unit is the joule J) depends on speed of the molecule.  

Solid gains kinetic energy to become a liquid and then becomes a gas.

30) Answer is: alpha particles.

This was famous Rutherford’s Gold Foil Experiment: he bombarded thin foil of gold with positive alpha particles.

Rutherford observed the deflection of alpha particles on the photographic film.  

Alpha particles are helium atom particles, consist of two protons and two neutrons.  

According to Rutherford model of the atom: atoms have their charge concentrated in a very small nucleus.  

31) Answer is: highest.

For example, calcium oxide.

Calcium oxide (CaO) has ionic bonds between calcium cations (Ca²⁺) and oxygen anions (O²⁻).

Because it has strong ionic bonds, it has high melting point (around 2600°C).

Ionic bond is the electrostatic attraction between oppositely charged ions (cations and anions).

32) Answer is: a scientific model.

A scientific model is a representation of an idea, an object, a process or a system that is used to describe and explain phenomena that cannot be experienced directly.

33) Answer is: the superscript is mass number and the subscript is atomic number.

Atomic number(Z) is the number of protons, which is characteristic of a chemical element..

Mass number (A) is the total number of protons and neutrons in a nucleus.

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Combustion analysis of an unknown compound provides the following data: 73.5 grams carbon (C), 4.20 grams hydrogen (H) and 72.3 grams chlorine (Cl). What is the percent composition of each element in this compound?

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This problem is to apply Roult’s Law.

Roult’s Law states that the vapor pressure, p, of a solution of a non-volatile solute is equal to the vapor pressure of the pure solvent, Po solv, times the mole fraction of the solvent, Xsolv

p = Xsolv * Po sol

X solv = number of moles of solvent / number of moles of solution

The solvent is water and the solute (not volatile) is glycerin.

Number of moles = mass in grams / molar mass

mass of water = 132 ml * 1 g/ml = 132 g

molar mass of water = 18 g/mol

=> number of moles of water = 132 g / 18 g/mol = 7.33333 mol

mass of glycerin = 27.2 g

molar mass of glycerin:, C3H8O3: 3 * 12 g/mol + 8 * 1 g/mol + 3*16 g/mol = 92 g/mol

number of moles of glycerin = 27.2g / 92 g/mol = 0.29565

total number of moles = 7.33333 moles + 0.29565 moles = 7.62898 moles

=> X solv = 7.33333 / 7.62898 = 0.96125

=> p = 0.96125 * 31.8 torr ≈ 30.57 torr ≈ 30.6 torr.

Answer: 30.6 torr

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Converting carbon to nitrogen by increasing the number of protons from 6 to 7 and decreasing the number of neutrons from 8 to 7 is an example of what type of decay? beta decay positron emission electron capture alpha decay

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Converting carbon to nitrogen by increasing the number of protons from 6 to 7 and decreasing the number of neutrons from 8 to 7 is an example of what type of decay? beta decay positron emission electron capture alpha decay

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Which elements likely conduct electricity well? chromium iodine carbon calcium osmium

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Which elements likely conduct electricity well? chromium iodine carbon calcium osmium

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WORTH 15 FOR 2 EASY QUESTIONS MULTIPLE CHOICE SECOND QUESTIONS EVEN EASIER THAN THE FIRST IM PRETTY SURE THE ANSWER IS C JUST CHECKING Which of the following conditions would likely prevent the assembly and survival of new kinds of organic molecules on Earth today? A. the presence of bacteria and other life forms B. the presence of carbon dioxide C. the supply of atoms that serve as raw material D. the light and warmth from the sun 2. Several different species make up a A. family. B. genus. C. kingdom. D. phylum.

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Answer:

The integumentary system covers the surface of the body is true about the integumentry system.

Explanation:

The integumentary system includes the skin, nails, glands, hairs, and nerves. Its main role is to act as a barrier to protect the body from the outside environment. It also retains body fluids, regulates body temperature, eliminates waste products, and protects against disease.

The integumentary system is the largest organ in the body that covers the surface of the body.

Thus, The integumentary system covers the surface of the body is the true statement about the integumentry system.

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The cell membrane of a red blood cell will allow water, oxygen, carbon dioxide, and glucose to pass through. Since other substances are blocked from coming in, this is membrane is called: A) perforated B) semi-permeable C) non-conductive D) permeable

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Correct answer: C). Genetically different haploid cells

Meiosis is a type of cell division in which four haploid cells are produced, which are genetically different from the parent. It reduces the chromosome number exactly half as contained in the parent. That is why it is called as a reductional division.

In the first round of meiosis I homologous pairs of chromosome separate and the sister chromatids separate during meiosis II.

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Cytophaga can digest cellulose into glucose for the cell to use an energy source to make atp and as a carbon source. select one: a. True b. False

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Answer:

The integumentary system covers the surface of the body is true about the integumentry system.

Explanation:

The integumentary system includes the skin, nails, glands, hairs, and nerves. Its main role is to act as a barrier to protect the body from the outside environment. It also retains body fluids, regulates body temperature, eliminates waste products, and protects against disease.

The integumentary system is the largest organ in the body that covers the surface of the body.

Thus, The integumentary system covers the surface of the body is the true statement about the integumentry system.

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Which fatty acid contains its first double bond on the sixth omega carbon?

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Which fatty acid contains its first double bond on the sixth omega carbon?

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The molality of a solution that is made by dissolving a certain mass of benzene in 20.6 g of carbon tetrachloride is 0.529 m. How many moles of benzene were dissolved?

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This problem is to apply Roult’s Law.

Roult’s Law states that the vapor pressure, p, of a solution of a non-volatile solute is equal to the vapor pressure of the pure solvent, Po solv, times the mole fraction of the solvent, Xsolv

p = Xsolv * Po sol

X solv = number of moles of solvent / number of moles of solution

The solvent is water and the solute (not volatile) is glycerin.

Number of moles = mass in grams / molar mass

mass of water = 132 ml * 1 g/ml = 132 g

molar mass of water = 18 g/mol

=> number of moles of water = 132 g / 18 g/mol = 7.33333 mol

mass of glycerin = 27.2 g

molar mass of glycerin:, C3H8O3: 3 * 12 g/mol + 8 * 1 g/mol + 3*16 g/mol = 92 g/mol

number of moles of glycerin = 27.2g / 92 g/mol = 0.29565

total number of moles = 7.33333 moles + 0.29565 moles = 7.62898 moles

=> X solv = 7.33333 / 7.62898 = 0.96125

=> p = 0.96125 * 31.8 torr ≈ 30.57 torr ≈ 30.6 torr.

Answer: 30.6 torr

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