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4 years ago

Why might your ears pop when you travel up a mountainside or fly in an airplane?

2 answers:

4 0

Your ears pop in airplanes because the air high above the surface of Earth is The High pressure when you are going up into the air

puteri [66]4 years ago

3 0

The pressure up in the plane or on a mountain is lower than the pressure at ground level. Since the air pressure is lower, that means some of the trapped air in your inner ear must escape to stabilize the pressure (so the pressure in your ear is equal to the lower pressure outside). As a result, your ears 'pop' to let out that trapped air in your ears and ensure that the pressure in your ear is equal to the pressure outside.

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10. 17.5 g of NaOH were dissolved in 350 mL of water. The solution was titrated with HNO3 to a methyl orange endpoint (methyl or

Tomtit [17]

1747.2 ml of HNO3 is required to reach methyl orange endpoint.

Explanation:

Number of moles of NaOH solution having 17.5 gram NaOH in 350ml of water.

Atomic weight of NaOH = 40 g/mol

thus number of moles= 17.5/40

= 0.437 moles

Now the molarity of the solution is calculated as

M=n/C

= 0.437/O.35 LITRES

= 1.248 M solution of the base

the molarity of acid is given as 0.25 M of HNO3

From the formula

M1V1=M2V2 we can calculate the volume of HNO3 required to make solution acidic.

1.248*350= 0.25*v2

v2= 1.248*350/0.25

= 1747.2 ml

Thus 1747.2 ml of HNO3 is required.

3 0

3 years ago

What happens to the air as the stove heats it?

erastova [34]

NOTHING really but as the stove is on with water boiling the air get moist

7 0

3 years ago

Determine la cantidad aproximada de nitrato potásico (NaNO3) que habrá que mezclar con 150 g de agua para obtener una disolución

hammer [34]

Answer:

Determine the approximate amount of potassium nitrate (NaNO3) that must be mixed with 150 g of water to obtain a saturated solution at 10ºC.

A) 80 g

B) 40 g

C) 120 g

D) 160 g

4 0

3 years ago

Someone help me with this ASAP!!

Sav [38]

Answer:Heavy rainfall causes a landslide on the side of a mountain

Explanation: The hydrosphere is the water in the world. The geosphere is rocks and earth.

3 0

3 years ago

Read 2 more answers

How many grams of oxygen are required to burn 13.5 g of acetylene

Vinil7 [7]

Answer:

41.54 grams of oxygen are required to burn 13.5 g of acetylene

Explanation:

The balanced reaction is:

2 C₂H₂ + 5 O₂ → 4 CO₂ + 2 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

C₂H₂: 2 moles
O₂: 5 moles
CO₂: 4 moles
H₂O: 2 moles

Being the molar mass of the compounds:

C₂H₂: 26 g/mole
O₂: 32 g/mole
CO₂: 44 g/mole
H₂O: 18 g/mole

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

C₂H₂: 2 moles* 26 g/mole= 52 grams
O₂: 5 moles* 32 g/mole= 160 grams
CO₂: 4 moles* 44 g/mole= 176 grams
H₂O: 2 moles* 18 g/mole= 36 grams

You can apply the following rule of three: if by stoichiometry 52 grams of acetylene react with 160 grams of oxygen, 13.5 grams of acetylene react with how much mass of oxygen?

$mass of oxygen=\frac{13.5 grams of acetylene*160 grams of oxygen}{52 grams of acetylene}$

mass of oxygen= 41.54 grams

41.54 grams of oxygen are required to burn 13.5 g of acetylene

8 0

3 years ago