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4 years ago

How do hot air balloons stay in the air

Chemistry

1 answer:

solong [7]4 years ago

8 0

Answer:

The heated air.

Explanation:

The was hot air balloons stay in the air is because the flame heats the air int he balloon. Hot air travels upwards, causing the balloon to inflate and take off. The heated air pushes the balloon off the ground and into the air.

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Identify the best practices for writing

Bogdan [553]

• Gather facts and define key points and goals.

• Structure your tone and context for your audience.

• Make it clear.

• Make it appealing and help the reader navigate.

4 0

3 years ago

A scientist wrote a report that communicates the steps he performed in an investigation, the data he gathered, and his conclusio

Nookie1986 [14]

Answer:

<u>yes, this is an acceptable practice in research.</u>

<u>Explanation:</u>

Note that, having a different result in one's research does not imply it is automatically invalid. However, because there may have been some errors or limitations in the previous work by the male researcher, it is possible that the later results are more accurate, even though she used the same procedures. She may have been more careful when calculating her results.

4 0

4 years ago

What is the percentage yield of O2 if 12.3 g of KClO3 (molar mass 123 g) is decomposed to produce 3.2 g of O2 (molar mass 32 g)

My name is Ann [436]

Answer:

The percentage yield of O2 is 66.7%

Explanation:

Reaction for decomposition of potassium chlorate is:

2KClO₃ → 2KCl + 3O₂

The products are potassium chloride and oxygen.

Let's find out the moles of chlorate.

Mass / Molar mass = Moles

12.3 g / 123 g/mol = 0.1 mol

So ratio is 2:3, 2 moles of chlorate produce 3 mol of oxygen.

Then, 0.1 mol of chlorate may produce (0.1 .3)/ 2 = 0.15 moles

Let's convert the moles of produced oxygen, as to find out the theoretical yield.

0.15 mol . 32 g/ 1mol = 4.8 g

To calculate the percentage yield, the formula is

(Produced Yield / Theoretical yield) . 100 =

(3.2g / 4.8g) . 100 = 66.7 %

8 0

4 years ago

Arrange the following compounds in order of increasing acidity, and explain the reasons for your choice of order. a. 2,4-dinitro

ludmilkaskok [199]

Compounds in order of increasing acidity will be written as d<c<b<a.

<h3>What is acidity?</h3>

The quantity of hydroxyl ions that a basic molecule may create in an aqueous solution is what is known as the acidity of bases. The quantity of hydronium ions that a substance may create in an aqueous solution determines how basic an acid is.

a, b are more acidic than c and d because of OH group attached to sp2 hybridised carbon which provide resonance stability for conjugate base

in c f has -I effect which increases acidity in a, NO2 has -m effect which increases acidity so increasing order is d<c<b<a

that is cyclohexanol < 2,4-difluorocyclohexanol < phenol < 2,4-dinitrophenol

to learn more about acidity go to -

brainly.com/question/19584961

#SPJ4

3 0

2 years ago

complete the sentence. If mass remains the same while the volume of a substance________ and the density of the substance will __

densk [106]

<span> If mass remains the same while the volume of a substance increases and the density of the substance will decrease or, volume decreases and density increase, 'cause density equals mass divided in volume, which means that volume and density are inversely proporcional</span>

3 0

4 years ago

Read 2 more answers