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goldfiish [28.3K]
4 years ago
15

How was it first discovered that hot air could rise?

Chemistry
1 answer:
Sunny_sXe [5.5K]4 years ago
6 0
The history of balloon flight dates to 1783, when two French brothers, Joseph and Etienne Montgolfier, discovered that filling a bag with hot air would cause it to rise. They demonstrated their principle at Annonay, France, on June 4, 1783, with an unmanned balloon made of linen and pape
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In nature, oxygen has three common isotopes. The atomic masses and relative abundances of these isotopes are given in the table
Vaselesa [24]

Answer: The average atomic mass of oxygen is 15.999 amu

Explanation:

Mass of isotope O-16 = 15.995 amu

% abundance of isotope O-16= 99.759 % = \frac{99.759}{100}=0.99759

Mass of isotope O-17 = 16.995 amu

% abundance of isotope O-17 = 0.037% = \frac{0.037}{100}=0.00037

Mass of isotope O-18 = 17.999 amu

% abundance of isotope O-18 = 0.204% = \frac{0.204}{100}=0.00204

Formula used for average atomic mass of an element :

\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})

A=\sum[(15.995\times 0.99759)+(16.995\times 0.00037)+(17.999 \times 0.00204)]

A=15.999

Thus the average atomic mass of oxygen is 15.999 amu

5 0
3 years ago
During which phase of mitosis does the cell begin to split into two daughter cells
artcher [175]

Answer:

\text{Telophase}

Explanation:

<em>Telophase is the process that separates the duplicated genetic material carried in the nucleus of a parent cell into two identical daughter cells.</em>

<em />

<em />-TheAnimeGirl-<em />

3 0
2 years ago
Read 2 more answers
A system that does no work but that transfers heat to the surroundings has
ASHA 777 [7]

Answer:

answer is attached by me

Explanation:

hope it helps you

7 0
3 years ago
An ideal gas originally at 0.85 atm and 66°C was allowed to expand until its final volume, pressure and temperature were 94.0mL,
xeze [42]

Answer: The original volume in liters was 0.0707L

Explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}

where,

P_1 = initial pressure of gas = 0.85 atm

P_2 = final pressure of gas = 456 mm Hg = 0.60 atm   (760mmHg=1atm)

V_1 = initial volume of gas = ?

V_2 = final volume of gas = 94.0 ml

T_1 = initial temperature of gas = 66^oC=273+66=339K

T_2 = final temperature of gas = 113^oF=318K  (32^0F=273K)

Now put all the given values in the above equation, we get:

\frac{0.85\times V_1}{339}=\frac{0.60\times 94.0}{318}

V_1=70.7ml=0.0707L   (1L=1000ml)

Thus the original volume in liters was 0.0707L

8 0
3 years ago
The correct coefficients needed to balance the following reaction are:
velikii [3]
I think the correct answer is c if not it’s d
5 0
3 years ago
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