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kupik [55]
3 years ago
8

a difference in density between gases creates buoyancy, which is the ability of an object to float. At 0 degrees celsius, helium

has a density of 0.18kg
Chemistry
1 answer:
GaryK [48]3 years ago
3 0

Answer: for an object or gas or liquid to float in another there must be a difference in density

Explanation:

Helium has a density of 0.18 kg/m³ and air has a density of 1.29 kg/m^³. If a balloon is filled with helium it will float in air due to density differences

Archimedes' principle states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces

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_c h 3 c h 2 c o o h+ _0 2 -》 _h 2 o + co2 how many molecules of o2 are required for the complete combustion of 6 moles of propa
lesya692 [45]

Answer:

21 molecules of oxygen.

Explanation:

The balanced equation is

2CH3CH2COOH + 7O2 ----->  6CO2 +  6H2O.

So 2 molecules of propanoic acid require   7 moles of oxygen.

Therefore 6 molecules require 7/2 * 6 = 21 molecules of oxygen.

3 0
3 years ago
How does granite differ from gabbro in coloring and
svetoff [14.1K]

Explanation:

Igneous rocks are formed by the crystallisation of a magma. The difference between granites and basalts is in silica content and their rates of cooling. A basalt is about 53% SiO2, whereas granite is 73%. Intrusive, slowly cooled inside the crust.

8 0
3 years ago
An acorn falls from a tree and accelerates at 9.8 m/s2. It hits the ground in 0.67 s. What is the speed of the acorn when it hit
ivolga24 [154]
Acceleration means that while it's falling, its speed will increase by 9.8 m/s
every second.  That's the acceleration of everything that falls near the Earth's
surface, no matter how heavy or light the object is.

In 0.67 seconds, then, the speed of the acorn increases from zero to

                 (0.67 x 9.8) = <u>6.57 m/s</u> .
8 0
3 years ago
If a solution contains 20g of glycerol and 5g of coeine, what is the codeine percentage strength of the solution?
Strike441 [17]

20%

The codeine percentage strength of the solution is 20%

  • The term "percent strength" describes the proportion of a material that has dissolved in a given volume of liquid.
  • Knowing how parts relate to wholes is the secret of % strength: A percent is equal to x parts out of 100 overall.

<h3>Meaning of percentage strength</h3>
  • The amount of a liquid is often measured, and the % strength tells you how many parts by volume of the active ingredient are present.
  • 100 parts by volume are included in the total volume of the solution or liquid preparation.

<h3>How do you determine a solution's strength?</h3>

Mass of solute times strength of solution(g) Amount of the solution(L)

  • The amount of solute dissolved in grams per liter of the solution is used to determine the solution's strength.
  • It stands for the solution's potency or concentration.
  • It uses grams per liter to express.

To learn more about percentage strength visit:

brainly.com/question/14661341

#SPJ4

5 0
2 years ago
Which of the following statements is false?<br>​
Artist 52 [7]
The correct answer in 81
7 0
3 years ago
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