The children in the class are more than 10 years old

Answer:

The new volume of the air inside when the cabin is pressurized to 75 kPa is 37818.[tex]\overline 6[/tex] m³

Explanation:

The given 747 airplane parameters are;

The volume of air in the airplane, V₁ = 28,000 m³

The pressure of the air on the ground, P₁ = 101.3 kPa

The pressure of the air once it is in flight, P₂ = 75 kPa

Let V₂ represent the new volume of the air inside when the cabin is pressurized to 75 kPa

Boyle's Law states that the pressure of a given mass of air is inversely proportional to its volume at constant temperature

Therefore, by Boyle's law, we have;

P ∝ 1/V and P₁·V₁ = P₂·V₂

Which gives;

V₂ = P₁·V₁/P₂

Substituting the known values, we get;

V₂ = 101.3 kPa × 28,000 m³/(75 kPa) = 37818.[tex]\overline 6[/tex] m³

The new volume of the air inside when the cabin is pressurized to 75 kPa = V₂ = 37818.[tex]\overline 6[/tex] m³.

Answer:

C

Explanation:

5 moles of oxygen are needed to produce 1 mols of P4O10

x moles of oxygen are needed to produce 2 mols of P4O10

5/x = 1/2             Cross multiply

1*x = 2 * 5           Combine

x = 10

C

The given orbital diagram are iron and symbol for the element is Fe

Orbital diagrams are a pictorial description of electrons in an atom and where electron go in atom then we have to follow three rules, and the first one being the Auf bau Principle, the Auf bau Principle states that each electron occupies the lowest energy orbital  first filled and the second is pauli exclusion principle in which only two electron are present which is in opposite spin and third is hunds rule of maximum multiplicity in which pairing of electron is not possible until orbital are singly occupied this rules are used for filling the electron here given orbital diagram in which 1s²2s²2p⁶3s²3p⁶4s²3d⁶ means the element is iron and symbol of this element is Fe

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Answer:

B. electrons and protons.

Explanation:

In an electrically neutral atom of any element, there are equal number of protons and electrons in the atom.

Protons are the positively charged particles in an atom.

Electrons are the negatively charged particles within the atom.

  When the number of protons and electrons are the same or equal, the atom is neutral.

But when there is an imbalance, an ion results.

Answer:

Chemical change

Explanation:

If two types of matter reacts or are combined and energy is given off, the type of change that might have occurred is a chemical change.

A chemical change is one in which a new kind of matter is formed.

It is always accompanied by energy changes.

The process is not easily reversible.

Answer:

The oxidation number of Oxygen is -2.

Answer:

-2

Explanation:

I just had that question!

Answer:

Volume in L = 0.50 L

Explanation:

Given data:

Molarity of solution = 0.1850 M

Mass of BaCl₂ = 19.30 g

Volume of solution = ?

Solution:

First of all we will calculate the number of moles of solute:

Number of moles = mass/molar mass

Molar mass of BaCl₂ = 208.23 g/mol

Number of moles = 19.30 g / 208.23 g/mol

Number of moles = 0.093 mol

Volume of solution:

Molarity = number of moles of solute / volume of solution in L

0.1850 M = 0.093 mol / Volume in L

Volume in L = 0.093 mol / 0.1850 M  (M= mol/L)

Volume in L = 0.50 L

Answer:

Each sample has the same number of molecules.

Explanation:

Just took the quiz on edge 2021

Taking into account the definition of Avogadro's number, each sample has the same number of molecules.

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole.

Avogadro's number applies to any substance.

Avogadro's number applies to any substance. This means that the number of molecules in 1 mol of oxygen is equal to the number of molecules in 1 mol of nitrogen.

Finally, the correct answer is the third option: each sample has the same number of molecules.

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Answer:

Explanation:

A is the correct answer.

If you found my answer useful then please mark me brainliest

Answer:

I put this so the guy up top can have brainliest

Explanation:

your welcome

Answer:

During exercise, your body may need three or four times your normal cardiac output, because your muscles need more oxygen when you exert yourself. During exercise, your heart typically beats faster so that more blood gets out to your body.

Answer:

I'd myself say it's because a lot of people are fat but here's the real answer ;)

During exercise, your body may need three or four times your normal cardiac output, because your muscles need more oxygen when you exert yourself. During exercise, your heart typically beats faster so that more blood gets out to your body.

Answer:

B. Add more water to decrease the concentration.

Explanation:

If we add more water to the solution, the concentration is decreased and like wise the conductivity of the solution.

Concentration and conductivity are directly proportional to one another. The higher the concentration, the higher the conductivity and vice versa.

Answer:

Electrical energy (form of kinetic energy)

Explanation:

Answer:

A

Explanation:

B. That's a solid

C. Liquid is the only thing that can have viscosity

D. Not necessarily the case

Answer:

c

Explanation:

Answer:

5*10^25 atoms of carbon

Explanation:

Answer:

What can be said about these common forms of sulphur is that;

(B) They will exhibit same chemical properties

Explanation:

Allotropy is the property of an element to exist in two or more forms in the same physical state

Allotropes have several similar chemical  properties but differ in their physical properties, such as the white, pale yellow to totally colorless diamond and the gray graphite

Sulphur can exist in several allotropic forms, and carbon is the only element that has more allotropes than sulphur

The sulphur allotropes includes S₂, S₆, and S₅ have similar chemical properties but different physical properties.

The correct option is;

What can be said about these common forms of sulphur is that they have the same chemical properties

Answer:

detail is given below.

Explanation:

This law was given by French chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

For example:

In given photosynthesis reaction:

6CO₂ + 6H₂O  → C₆H₁₂O₆ + 6O₂

The given equation is balanced chemical equation of photosynthesis. There are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.

If equation is not balanced,

CO₂ + H₂O  → C₆H₁₂O₆ + O₂

It can not follow the law of conservation of mass because mass is not equal on both side of equation.

Answer:

If an object is at rest, then there are no forces acting on the object. It would take an unbalanced force to keep an object in motion at a constant velocity. It is the natural tendency of all objects to eventually come to a rest position.

Explanation:

Answer:

0.355L

Explanation:

1fl oz (Fluid ounce) is an unit of volume widely used in United States of America. 1fl oz is equivalent to 29.5735mL.

12.0 fl oz are:

12.0fl oz * (29.5735mL / 1fl oz) = 354.9mL

There are 354.9mL in 12.0 fl oz.

As 1L = 1000mL, in 354.9mL you have:

354.9mL * (1L / 1000mL =

Answer:

The water level in the pipe went down.] ... [The hot water in the cup heated up the water particles inside the bottle. They began to move more. Greater motion (kinetic energy) pushed the particles farther apart, resulting in expansion.

Answer:

1.08 x 10²⁵molecules

Explanation:

From the mole concept we know that ;

      1 mole of any substance contains 6.02 x 10²³ molecules

This number is the Avogadro's number.

 So;

  18 mole of CH will contain:

       Number of molecules of CH  = 18 x 6.02 x 10²³ = 1.08 x 10²⁵molecules

The number of molecules is therefore 1.08 x 10²⁵molecules

Answer:

45.9m

Explanation:

Given parameters:

Mass of the ball  = 1kg

Initial velocity  = 30m/s

Unknown:

Height the ball will travel  = ?

Solution:

At the maximum height, the final velocity of the ball  will be 0;

  Using ;

   V²   = U²   - 2gh

V is the final velocity

U is the initial velocity

g is the acceleration due to gravity

h is the height

     0² = 30²   - (2 x 9.8 x h)

    0 = 900 - 19.6h

      h  = 45.9m

Answer:

Cu   +   2AgNO₃    →   2Ag   +  Cu(NO₃)₂

Explanation:

We are to give the reaction expression for this displacement reaction.

 Reactants  = copper and silver nitrate solution

 Products  = silver and copper (II) nitrate

Copper  = Cu

 Silver nitrate solution  = AgNO₃  

Silver  = Ag

copper (II) nitrate  = Cu(NO₃) ₂

So:

         Cu   +   2AgNO₃    →   2Ag   +  Cu(NO₃)₂

Answer:

Explanation:

I can help

Answer:

12.67g of Mg / 15.33g of MgO * 100% = 82.6% of Mg

Explanation:

Answer:

B. Mass in motion. Is the definition of momentum

The following that is not a way to measure a race car's motion is its velocity. The correct option is b.

Motion is a phenomenon that changes the position of an object with respect to time. The motion needs a force to change the position, and motion needs some energy that can be potential energy or a force.

Velocity is the speed of any object that is in motion in a particular direction. It tells the rate of change of motion of an object. It is a scalar quantity.

Motion is the result of force. Force can be measured by multiplying the mass by acceleration.  So the variables that would be needed to calculate a race car's motion will be acceleration and the mass of the car, and the resistances.

Thus, the correct option is b. it’s velocity.

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Answer: D

Explanation: cells are alive

Answer:

D

Explanation:

Cells are the most basic unit of life.