A feather gently floats on a pool. Which of the following statements best explains why the feather stays on top of the water?

The name of the hydrocarbon having hydrogen atoms above and below each carbon atom and at the ends of carbon chain is pentane.

Hydrocarbons are the compounds which are formed by the combination of hydrogen and carbon atoms.

In the question it is mention that in the compound 5 carbon atoms are present and there specifically not mention the bonds so that single bonds are present between all of them. And hydrogen atoms are attached to single carbon atoms to fulfill their valency.

Hence required hydrocarbon is pentane and its structure is attached below.

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Answer:

it says the answer bro

look

Explanation:

Answer:

true

Explanation:

Students often have no experience with the idea that some things (particles) can’t be divided. If sand is ground up into tiny pieces it is still sand. There seems no reason why the dividing can’t keep on going to smaller and smaller pieces. This is often described as a continuous view of matter.

Even when children are introduced to the idea of matter being made of particles, most consider there is still ‘stuff’ between the particles and that something like air fills the empty space. After all, when liquid is poured from a glass so that it is empty it still contains air.

These ideas are further explored in ‘Hannah’s Question,’ a classroom practice vignette.

Research: Loughran, Berry, Mulhall & Gunstone (2001), Novick & Nussbaum (1981)

Particles are often assumed to behave in the same way as the substances they make up. For example students can believe that particles themselves can swell, shrink and melt or that the particles in stone are harder than the particles in rubber. Many students consider that ice molecules melt to little droplets of water.

Scientific view

The properties of matter can best be explained using a model in which all materials are composed of tiny particles (atoms, molecules and ions).

There is empty space between particles and particles are constantly moving (their speed is changed by temperature). The particles in solids and liquids are quite close to each other, while those in gases are a very long way apart. (There is commonly an increase in volume of at least 1000 fold when substances move from solid or liquid to gas).

Changes of state involving solids, liquids and gases as well as a range of other phenomena can be explained by changes in arrangement and speed of the particles.

Answer:

A coffee cup calorimeter is a constant-pressure calorimeter.

Explanation:

As such, the heat that is measured in such a device is equivalent to the change in enthalpy.

Answer:

The pH of a solution that has a [OH-] of 5.08x10^-5 M is 5

Explanation:

just took the test

onedg2020

Sodium hydroxide is a strong base means that  NaOH dissociates completely to Na (aq) and OH-(aq)

A strong base is a base that is completely dissociates in solution to yeild the hydroxide ion in high concentration.

Hence, the fact that sodium hydroxide is a strong base means that  NaOH dissociates completely to Na (aq) and OH-(aq) when it dissolves in water.

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Answer:

[tex]ph \: of \: a \: solution \: = - \: log \: ( {h}^{ + } ) \\ given \: ( {h}^{ + } ) = 2 \times {10}^{ - 5} \\ = ph = - log \: (2 \times {10}^{ - 5} ) \: = 5 - log \: 2 = 4.7[/tex]

Answer:

b

Explanation:

The number of mole of nitrogen gas in the 16.8 L container is 0.75 mole

Data obtained from the question

Volume (V) = 16.8 L

Pressure (P) = STP = 1 atm

Temperature (T) = STP = 273 K

Gas constant (R) = 0.0821 atm.L/Kmol

Number of mole (n) =?

How to determine the number of mole

The number of mole of the nitrogen gas can be obtained by using the ideal gas equation as illustrated below:

PV = nRT

Divide both side by RT

n = PV / RT

n = (1 × 16.8) / (0.0821 × 273)

n = 0.75 mole

Thus, the number of mole of the gas present is 0.75 mole

Answer:

0.425 atm

Explanation:

According to Ideal Gas Equation,

Given :

Solving :

Answer:

5.6 moles of AgNO3 is required to produce 2.8 moles of Cu(NO3)2Explanation:Cu + 2AgNO3 Cu(NO3)2 + 2AgBefore solving this one must make sure the equation is balanced.  From the balance equation you could notice that the AgNo3(silver nitrate) has 2 moles while the Cu(NO3)2 has 1 mole. If 2 moles = 1 mole    ?   = 2.8 molescross multiply 2.8 x 2 = 5.6 moles 

Explanation:

If two reactant particles collide, but bounce away unaffected, this is called an ineffective collision.

According to the collsion theory, the reaction between particles occur as a result of the collsion of particles that have energy that is in excess of the activation energy.

Now if two particles, do not posses the activation energy, they collide and rebound from each other. This is called an ineffective collision.

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Considering the Avogadro's Law, 1.52 moles are left in the container.

Avogadro's Law is a gas law that establishes the relationship between the amount of gas and its volume when temperature and pressure are held constant.

This law states that the volume is directly proportional to the amount of gas: if the amount of gas increases, the volume will increase; while if the amount of gas decreases, the volume decreases.

Mathematically the law can be expressed as:

[tex]\frac{V}{n}=k[/tex]

Assuming that you have a certain amount of gas n1 that occupies a volume V1 and the amount of gas varies until a new value n2, then the volume will change to V2, and the following will be true:

[tex]\frac{V1}{n1}=\frac{V2}{n2}[/tex]

In this case, you know:

Replacing in the Avogadro's Law:

[tex]\frac{65 L}{2 moles}=\frac{49.4 L}{n2}[/tex]

Solving:

[tex]n2x\frac{65 L}{2 moles}=49.4 L[/tex]

[tex]n2=\frac{49.4 L}{\frac{65 L}{2 moles}}[/tex]

n2= 1.52 moles

Finally, 1.52 moles are left in the container.

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Answer: Propane is c3h8 and oxygen gas is O2

Explanation: make sure equation is balanced and There are 3 carbons in the reactants, and 3 carbons in the products also There are 8 hydrogens in the reactants and 8 hydrogens in the products even though There are 10 oxygens in the reactants and 10 oxygens in the product its already balanced so therefore you then need to  convert the amount of moles of oxygen to the number of moles of propane to get your answer

Answer:

4.7 Liters of NO2

Explanation:

mole weight of HNO3  (from periodic table) = ~~ 63 gm/mole

  12 grams of this is   12/63 = .19047 mole

From the equation, you should be able to see that 3 moles of NO2 produces 2 moles of HNO3

  so you need  3/2 * moles HNO3 = .2857 moles of NO2 needed

PV = nR T     n = moles   R = .082057 L-atm/(k-mole)    25 C = 298.15 K

1.6 (V) = .2857 (.082057)(298.15)

  solve for V = 4.37 liters of NO2

Answer: Heyo Kenji Here! Here's your answer- N2(g) → NH4+(aq)

Explanation: Hope this helps!

Have a nice day!
- Kenji ^^

Answer:

decreases

Explanation:

Atomic size gradually decreases from left to right across a period of elements. This is because, within a period or family of elements, all electrons are added to the same shell.

Answer: Heyo Kenji Here! Here's your answer- Higher alkenes and alkynes are named by counting the number of carbons in the longest continuous chain that includes the double or triple bond and appending an -ene (alkene) or -yne (alkyne) suffix to the stem name of the unbranched alkane having that number of carbons.

Explanation: Hope this helps!

Have a nice day!

- Kenji ^^

Answer:

Alkene and alkyne compounds are named by identifying the longest carbon chain that contains both carbons of the double or triple bond.

Explanation:

Chemical equilibrium is a dynamic equilibrium that is affected by changes in temperature, concentration and pressure

Chemical equilibrium is a dynamic state in a chemical reaction in which the rate of forward reaction is equal to the rate of backward reaction.

For a reaction in equilibrium, the following factors affect equilibrium:

The principle of chemical equilibrium states that in an isolated system in equilibrium, equilibrium will shift to annul any constraint applied in the system.

Therefore, chemical equilibrium is dynamic and is affected by temperature, concentration and pressure.

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C. Regulation body temperature

Because 5.00 mL is a small amount, the best tool he could use is a pipette.

Pipette or sometimes spelled as pipet can be used to transport liquid samples. It is made out of glass or plastic and can is usually used to transfer measured volumes of liquid from one container to another.

Before the pipette was invented, scientists used to use straws and they would suck in the samples carefully.

Hence 5.00 mL is a small amount, the best tool he could use is a pipette.

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Answer:

Explanation:

Part 1: Theoretical yield

5.00 + 4.24 = 9.24 grams

Part 2: Percent yield

Percent yield = (actual yield)/(theoretical yield) * 100 = (6.55)/(9.24) * 100 = 70.9%

Answer:

⇌ means that the equation is reversible, The reactants can become products and vice versa

Explanation:

Answer:

See below ~

Explanation:

The reaction :

The double sided arrow represents that this is a reversible reaction.

Just as calcium carbonate can dissociate into calcium ion and carbonate ion, it can form calcium carbonate when calcium ion and carbonate ion are bonded together ionically.

The solubility of the gas when the pressure is decreased to 101 KPa at constant temperature is 0.853

This states that the solubility of a gas in liquids at constant temperature is proportional to its pressure. Mathematically, it can be expressed as

S₁ / P₁ = S₂ / P₂

Where

From the question given above, the following data were obtained

S₁ / P₁ = S₂ / P₂

0.98 / 116 = S₂ / 101

Cross multiply

116 × S₂ = 0.98 × 101

Divide both side by 116

S₂ = (0.98 × 101) / 116

S₂ = 0.853

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Calculate. 925 x 1.5 is 412.5 + 412.5 + 412.5.

This totals to 1387.5 kPa.

The percent yield of oxygen if 10.2 g of O₂ is produced from the decomposition of 17.0 g of H₂O is 67.6%.

Moles (n) of any substance can be calculated by using their mass as:

n = W/M, where

W = given mass

M = molar mass

Given chemical reaction is:

2H₂O → 2H₂ + O₂

Moles of 17g H₂O = 17g / 18.02 g/mol = 0.943 moles

From the stoichiometry of the reaction it is clear that,

2 moles of H₂O = produces 1 mole of O₂

0.943 moles of H₂O = produces 1/2×0.943=0.471 mole of O₂

Now mass of this 0.471 moles of O₂ = (0.472mol)(32g/mol) = 15.104 grams

Actual mass of oxygen = 10.2g (given)

Now on putting vales on the percent yield formula, we get

% yield = (10.2 / 15.104)×100% = 67.53% = 67.6%

Hence the required value of percent yield is 67.6%.

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Answer:67.6

Explanation:bc im just that good

Hi!one molecule of pyruvate contains three carbon atoms.

Glycolysis produces two pyruvate molecule and there are three carbon atoms are present in each pyruvate molecule.

Glycolysis is the process in which glucose is broken down to produce energy. It produces two molecules of pyruvate, ATP, NADH and water. The process takes place in the cytoplasm of a cell and does not require oxygen. It occurs in both aerobic and anaerobic organisms.

There are two pyruvate molecules produced at the end of glycolysis for every molecule of glucose metabolized. Therefore, two of the six original carbons will have been eliminated as CO2 at the end of this step.

The main purpose of glycolysis is to provide pyruvate for the trichloroacetic acid (TCA) cycle, not to make adenosine 5′-triphosphate.

Thus, there are three carbon atoms are present in pyruvate compound.

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Answer:

120.366 g/mol

Explanation:

MAGNESIUM SULPHATE HEPTAHYDRATE Magnesium sulfate is an inorganic salt containing magnesium, sulfur and oxygen, with the formula MgSO4. Molar mass: 120.366 g/mol

Answer:

sulfur and oxygen, with the formula MgSO4. Molar mass: 120.366 g/mol

Explanation:

Hi its me a another me lol

Answer: 11.478

Explanation:

M   =   MBVB- MAVA/VA + VB

      = number of moles of base - number of moles of acid/total volume

      = 3.6*10^-3 - 5.95*10^-4/1

      = 0.0036-0.000595   = 0.003005

[OH^-]   = M = 0.003005M

POH  = -log[OH^-]

         = -log0.003005

         = 2.522

PH   = 14 - POH

       = 14 - 2.522  

       = 11.478

Therefore, the pH of the solution is 11.478

Answer:

periods

Explanation:

In chemsitry, the horizontal columns are known as periods and the vertical columns are known as groups.