What was helium used for in the past?

Answers

Answer 1

Answer: Helium used to be used in hot air balloons. Then, when the Hindenburg exploded, annexed file, they realized that hydrogen was not only lighter, but it also was less flammable.

Answer 2

Answer:
Hot air balloons. They have a little hot plate/fire or whatever and they used, and that made the helium rise, thus rising the balloon.

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Water that flows back to the ocean is called?

Answers

Surface runoff

Explanation:

Water that flows back to the ocean is called surface runoff.

It is one of the different forms of water when it gets to the land surface.

Some of the water after rainfall and precipitation goes into the groundwater budget seeping through pore spaces.
This is called infiltration.
Other forms of water runs of the surface joining streams and lakes and even the ocean.
This component of the hydrologic cycle is called surface runoff.
Most water after rainfall collects as a surface runoff.
They generally flow down slope connecting with streams and lakes till they enter ocean as rivers.

learn more:

Rejuvenation of streams brainly.com/question/9259211

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What ion is present in all acid solutions?

Answers

Hydrogen is present in all acid solutions

Answer:

Ion are protons

Explanation:

How many moles of CO2 are emitted into the atmosphere when 22.1 g C8H18 is burned

Answers

Answer:

1.552 moles

Explanation:

First, we'll begin by writing a balanced equation for the reaction showing how C8H18 is burn in air to produce CO2.

This is illustrated below:

2C8H18 + 25O2 -> 16CO2 + 18H2O

Next, let us calculate the number of mole of C8H18 present in 22.1g of C8H18. This is illustrated below:

Molar Mass of C8H18 = (12x8) + (18x1) = 96 + 18 = 114g/mol

Mass of C8H18 = 22.1g

Mole of C8H18 =..?

Number of mole = Mass /Molar Mass

Mole of C8H18 = 22.1/144

Mole of C8H18 = 0.194 mole

From the balanced equation above,

2 moles of C8H18 produced 16 moles of CO2.

Therefore, 0.194 mole of C8H18 will produce = (0.194x16)/2 = 1.552 moles of CO2.

Therefore, 1.552 moles of CO2 are emitted into the atmosphere when 22.1 g C8H18 is burned

Final answer:

To calculate the number of moles of CO2 emitted into the atmosphere when 22.1 g of C8H18 is burned, we need to convert the mass of C8H18 to moles using its molar mass. The mole ratio between C8H18 and CO2 is 1:8 based on the balanced chemical equation. Thus the number of moles of CO2 produced can be calculated by multiplying the number of moles of C8H18 by the mole ratio.

Explanation:

To calculate the number of moles of CO2 emitted into the atmosphere when 22.1 g of C8H18 is burned, we need to convert the mass of C8H18 to moles using its molar mass. The molar mass of C8H18 is calculated by summing the atomic masses of its constituent elements: (12 g/mol for carbon)(8 carbon atoms) + (1 g/mol for hydrogen)(18 hydrogen atoms) = 114.22 g/mol for C8H18.

Next we need to use the balanced chemical equation for the combustion of C8H18 to determine the mole ratio between C8H18 and CO2. The balanced equation is: C8H18 + 12.5 O2 → 8 CO2 + 9 H2O.

From the balanced equation, we can see that 1 mole of C8H18 produces 8 moles of CO2. Thus we can calculate the number of moles of CO2 produced by dividing the mass of C8H18 by its molar mass and multiplying by the mole ratio:

number of moles of CO2 = (mass of C8H18 / molar mass of C8H18) * 8

Learn more about Molar Mass and Mole Calculations here:

brainly.com/question/30096298

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What is the percentage error if the experimental
value is equal to the accepted value?

Answers

If the experimental value is equal to the accepted value, the percent error is equal to 0. As the accuracy of a measurement decreases, the percent error of the measurement rises.

Which of the following is an example of anaerobic respiration? Plant roots respiring in soil
Respiring while swimming underwater
Oxygen diffusing into a plant cell through stomata
Breaking down of glucose with oxygen inside an animal cell

Answers

your answer is D have a good day

Answer:

Explanation:

think about it its d i did the test and the answer was right!

Taylor mixed two liquids together in a beaker. The beaker quickly heated up. What does this indicate about the reaction that took place in the beaker?A. that there was no energy transfer
B. that energy was created
C. that energy was transformed
D. that energy was destroyed

Answers

Answer: c

Explanation:energy cannot be made or destroyEd according to a law of energy

Answer:

The answer is C. that energy was transformed

Explanation:

Hope this helped!

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