The number of atoms of oxygen are present in 2.50 moles of sulfur dioxide is 30.110 × 10²³.
What is Avogadro's number?Avogadro's number is define as the number of atoms present in one mole of any substance and it is equal to 6.022 × 10²³.
In the 1 mole of SO₂ 2 moles of oxygen are present. So that in 2 moles of SO₂, 2(2.5) = 5 moles of oxygen is present.
No. of atoms of oxygen in 5 moles of oxygen will be calculated as:
No. of atoms = 5 mole × 6.022 × 10²³atoms per mole = 30.110 × 10²³atoms
Hence number of atoms of oxygen is 30.110 × 10²³.
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Part a
identify the problem that a car bumper is meant to address.
A car bumper is primarily meant to reduce the impact of damages to the front and rear ends of vehicles in case of collision.
Functions of car bumpersCars are equipped with bumpers both at the rear and front ends primarily for protective purposes.
The front end bumper reduces the impact of front collisions on the cooling system and the bonnet while the rear end bumper functions to protect the exhaust, the trunk, and several other parts in case of rear-end collisions.
Aside from protective functions, bumpers also serve to add beauty to cars.
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Science edpuzzle
Which of the following are some examples of a chemical change? Select all the apply
Answer:
the 3 in the middle
Explanation:
There are 5 signs of chemical changes these are odor change,color change, temperature change, production of gas and creation of precipitation.
what do you think might be different between fat molecules and carbohydrate and protein molecules?
Answer:
Long answer
Proteins are the building blocks of the body, each and every organ muscle and skin and cells are made of proteins. They can also be used for providing energy to the body in a state where other energy sources aren't available.
Fats are stored energy blocks which can be used by the body at its own convenience whenever there is a deficit of energy in the body. They can also be directly burnt to give energy in cases where energy needs of the body are not met by dietary intake
Carbohydrates are the most convenient and preferable source of energy in the body and are easily converted to give out immidiate energy to the body, excess carbohydrates can be converted into fats and stored for later usage as and when required by the body.
Proteins, fats and carbohydrates have many secondary functions and roles in the human body. If you are keen to know anything more specific feel free to ask.
Short answer :Fats are used for energy after they are broken into fatty acids. Protein can also be used for energy, but the first job is to help with making hormones, muscle, and other proteins.
Answer:
Most Nutrients are digested into easy and simpler compounds. Carbohydrates are used for energy . Fats are used for energy after they are broken into fatty acids. Protein can also be used for energy, but the first job is to help with making hormones, muscle, and other proteins.
Voltage-gated sodium channels are sensitive to changes in the extracellular concentration of
Voltage-gated sodium channels are the ion channels that conduct sodium ions. They are sensitive to the extracellular concentration of calcium ions.
What are Voltage-gated sodium channels?Voltage-gated sodium channels are the signaling ion channels that are responsible for increasing the action potential of the nerve cells. VGSC is the most important resting and action potential of the cell.
These channels are sensitive to the high concentration of calcium ions as these ions cause the channels to open up on the membrane surfaces of the cell. This causes a change in the concentration of the gradient across the membrane.
Therefore, VGSC is sensitive to calcium ions.
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is it true that a front is the boundry where two air masses meet
That's correct! When two different air masses meet, the boundary zone between them is called a front. The process of formation of the fronts is known as frontogenesis.
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Hope this helps! :)
a solution has a volume of 500 ml and contains 0.570 mol of nacl what is the molarity
Answer: 1.14 M
Explanation:
500 mL is equal to 0.5 L.
So, the molarity is (0.570)/(0.5) = 1.14 M
What happens when the temperature of the air cools.
Sorry this is late but the molecules in the substance will move much slower and take up less place as a molecule that moves faster will take up more space
Hope this helps :))
Which of the following statements correctly explains how latitude affects temperature?
1.Places that are closer to the equator receive more direct sunlight and have warmer temperatures.
2.The equator is an imaginary line drawn around the middle of the earth but has nothing to do with temperature.
3.laces that are far from the equator have warmer temperatures.
Answer:
It's 1, places that are closer to the equator receive more direct sunlight and have
Explanation:
An aqueous solution contains the following ions: cl−, ag , pb2 , no−3, and so2−4. More than one precipitate will form. Identify the precipitates
An aqueous solution contains the following ions Cl⁻, Ag⁺, Pb²⁺, NO₃⁻ & SO₄²⁻ and more than one precipitate will form are AgCl, PbCl₂, PbSO₄ & Ag₂SO₄.
What is precipitate?Precipitate is the insoluble compound which is present at the bottom of any chemical reaction in the solid state.
If in an aqueous solution Cl⁻, Ag⁺, Pb²⁺, NO₃⁻ & SO₄²⁻ ions are present then:
Compounds AgCl, PbCl₂, PbSO₄ & Ag₂SO₄ are not soluble in water as it is present in the form of precipitate.Pb(NO₃)₂ is fully soluble in water and will not make precipitate.Hence precipitates are AgCl, PbCl₂, PbSO₄ & Ag₂SO₄.
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Select the pair in which former is stronger nucleophile than latter in polar aprotic solvent
The pair in which former is stronger nucleophile than later in polar aprotic solvent is CH₃NH₂ and (CH₃)₂NH. The correct option is A.
What is nucleophile and polar aprotic solvent?Nucleophiles are molecules that have a pair of electrons that can be shared. They are also called electron rich species.
Polar aprotic solvents are incapable of forming hydrogen bonds with the substrate. They don't have any hydrogen atoms directly connected to an electronegative atom, so they can't form a hydrogen bond.
Acetone, chloroform, dichloromethane, and other aprotic solvents are examples.
Thus, the correct option is A. CH₃NH₂ and (CH₃)₂NH.
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Chemical energy is converted directly into electrical energy in.
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galvanic cell.What is the ph of a solution that has a [h ] = 0. 0039 m?
The pH of a solution that has a H⁺ ion concentration is 0.0039M is 2.4.
What is pH?pH of any solution gives idea about the acidity or basicity of solution and it will be calculated as:
pH = -log[H⁺]
Given that, concentration of H⁺ ion = 0.0039 M
On putting tis value in pH equation, we get
pH = -log(0.0039)
pH = -(-2.4) = 2.4
Hence required value of pH is 2.4.
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A storage tank contains n, o, and co2. The partial pressure of n and o gas are 600 torr and 150 torr. The total pressure is 825 torr. What is the partial pressure and mole fraction of co2?
The partial pressure of carbon dioxide is 75 torr.
What is Dalton's theory?Dalton's theory of gas states that total pressure of the mixture of gas sample is equal to the sum of the partial pressure of all the gases present in that sample.
Given that,
Total pressure of mixture = 825 torrPartial pressure of Nitrogen = 600 torrPartial pressure of oxygen = 150 torrPartial pressure of carbon dioxide = ?On putting values, we get
Partial pressure of carbon dioxide = 825 - (600 + 150) = 75 torr
Hence Partial pressure of carbon dioxide is 75 torr.
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which type of bond does this molecule show?
A. hydrogen bond
B. ionic
C. Double covalent
D. magnetic bond
Why is cellular reparation important for cells?
What is nourishing for a seed of a plant?
What is the pressure of 0.33 moles of nitrogen gas, if its volume is 15.0 L at –25.0oC?
Using the ideal gas law PV =nRTPV=nRT , we find that the pressure will be P =\frac{nRT}{V}P=
V
nRT
. Then, we'll substitute and find the pressure, using T = -25 °C = 248.15 K and R = 0.0821 \frac{atm\cdot L}{mol \cdot K}
mol⋅K
atm⋅L
:
P =\frac{nRT}{V} = \frac{(0.33\,\cancel{mol})(0.0821\frac{atm\cdot \cancel{L}}{\cancel{mol \cdot K}})(248.15\,\cancel{K})}{15.0\,\cancel{L}} = 0.4482\,atmP=
V
nRT
=
15.0
L
(0.33
mol
)(0.0821
mol⋅K
atm⋅
L
)(248.15
K
)
=0.4482atm
In conclusion, the pressure of this gas is P=0.4482 atm.
Reference:
Chang, R. (2010). Chemistry. McGraw-Hill, New York.
Which of the following is the equation for wave speed?
Answer:
b
Explanation:
b is the answer to your question
How many grams of carbon dioxide are produced when 16 g of methane and 48 g of oxygen gas combust
Chandra wants to know how many moles are contained in 150.0 g ccl4 (carbon tetrachloride). what quantity of ccl4 should she use to make this conversion? number of moles the number of atoms molar mass mole ratio
The quantity of carbon tetrachloride, CCl₄ she will use to make her conversion is molar mass
Description of moleThe mole of a substance is related to it's mass and molar mass according to the following equation:
Mole = mass / molar mass
How to determine the mole of CCl₄Mass of CCl₄ = 30 gMolar mass of CCl₄ = 12 + (35.5×4) = 154 g/mol Mole of CCl₄ =?Mole = mass / molar mass
Mole of CCl₄ = 150 / 154
Mole of CCl₄ = 0.974 mole
Thus, we can see that the molar mass of CCl₄ is needed to obtain the number of mole.
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A solution is prepared by dissolving 7. 31 g of na2so4 in enough water to make 225 ml of solution. Calclate the solutions molarity
The molarity of solution which is prepared by dissolving 7. 31 g of Na₂SO₄ in enough water to make 225 ml of solution is 0.22M
How do we calculate molarity?Molarity of the solution will be calculated by using the below equation as:
M = n/V, where
V = volume of solution = 225mL = 0.225Ln is the moles of solute which can be calculated as:n = W/M, where
W = given mass of Na₂SO₄ = 7.31gM = molar mass of Na₂SO₄ = 142g/moln = 7.31/142 = 0.05 mol
On puttig values, we get
M = 0.05 / 0.225 = 0.22M
Hence required molarity is 0.22M.
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if .296 j of heat causes a .661 degree c temperature change, what mass of water is present?
Answer:
m=0.000107 kg
Explanation:
H=m*cp*change in temperature
0.296=m*4182*0.661
m=0.000107 kg
How many molecules are contained in 3 moles of water molecules , h2o?
Answer:
Explanation:
By definition 3 moles of water molecules. Or about 3 * 6.022140E23 water molecules = 1.806642E24 water molecules.
hope this is right..
Answer: Simply multiply Avogadro's number(6.02x10^23) by 3 and that's your answer. Use a scientific calculator
Explanation:
he students in the picture below are using a globe and a lamp to model the Sun and the Earth.
If the model Earth acts the same as the real Earth, what will happen as the students spin the model?
A.
A new year will start each time the model Earth makes a complete turn.
B.
Different parts of the model Earth will have different seasons.
C.
All of the model Earth will have daytime at the same time.
D.
Some parts of the model Earth will have daytime and some will have night.
Answer:
D
Explanation:
1/2 will be lit with 'daylight' and the other half will be dark
What unit of mass measurement would I use to measure a vitamin pill?
Answer: Milligrams
Explanation:
Vitamins are measured in Milligrams because if used grams, there would be a higher dose.
Temperature
to measure the movement of particies such as atoms and molecutes. As temperature increases, what is always true of the particles in a substance?
O The rate of movement increases.
O The distance between them decreases.
O The attraction between them increases
© The rate of reaction decreases.
How many grams of oxygen are needed to react with 25. 0 g of mg
The amount in grams of oxygen are needed to react with 25g of Mg is 16.48 grams.
How do we convert mass into moles?Mass into moles or vice versa of any substance will be calculated by using the below formula as:
n = W/M, where
W = given mass
M = molar mass
Moles of Magnesium = 25g / 24.3g/mol = 1.028 = 1.03 mol
Chemical reaction will be:
2Mg + O₂ → 2MgO
From the stoichiometry of the reaction it is clear that 1 mole of oxygen is reacts with 2 moles of magnesium, so 1.03 moles of magnesium will reacts with (1/2)(1.03) = 0.515 moles of oxygen.
Mass of oxygen = (0.515mol)(32g/mol) = 16.48g
Hence required mass of oxygen is 16.48 grams.
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The buoyant force on an object in water is equal to the object's density. True or false
NO LINKS
Answer:
False
Bouyant force = volume of displaced fluid * density of fluid
When chlorine gas is bubbled into an aqueous solution of potassium iodide, the colourless solution turns brown.
i) Write an ionic equation for the reaction that takes place
ii) What is the name given to this type of reaction?
iii) Why does the solution turn brown?
Answer:
When chlorine (Cl 2 ) gas is passed through an aqueous solution of potassium iodide (KI), the products formed are solid iodine (I2) and potassium chloride (KCl). This is a displacement reaction in which the less reactive iodine in potassium iodide is displaced by the more reactive chlorine. The equation can be written as:
2KI(aq)+Cl2(g)→2KCl(aq)+I2 (s)
Which statement is true for a solution when its concentration of hydroxide ions becomes equal to the concentration of hydronium ions?
It becomes more acidic.
It becomes more alkaline.
Its pH becomes equal to 0.
Its pH becomes equal to 7.
When for a solution concentration of hydroxide ions becomes equal to the concentration of hydronium ions, its pH becomes equal to 7.
What is pH?pH of any solution is used to define the acidity, basicity or neutrality of the solution.
pH ranges from 0 to 6.9 shows acidity.pH 0 shows the neutrality.pH ranges from 7.1 to 14 shows the basicity.When the concentration of hydronium ion is equal to the concentration of the hydroxide ion then the resultant solution will be neutral, as they have a pH equals to 0.
Hence, pH of the solution becomes equal to 7.
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