Another gas was used for many years to float transportation balloons. WHICH GAS IS IT:

1) Carbon dioxide
2) Oxygen
3) Hydrogen

Why is this gas not used in balloons today?

Answers

Answer 1

Answer: Another gas that was used to fill balloons was hydrogen. The reason why hydrogen is not used today is because it use to cause many fires when it was used to fill balloons up.

Hope I helped you! :)

Answer:

Temperature dependency is responsible for the process that hot water freeze faster than cold water.

Explanation:

The effect given above is called Mpemba Effect. According to this idea hot water freezes more quickly as compared to cold water. But until now there is no convincing explanation for this strange phenomenon. One idea is that hot containers make better thermal contact with a refrigerator and so conduct heat more efficiently because a good conductor is good fro the transfer of heat. Another idea about this effect is that warm water evaporates more quickly and since this is an endothermic process, it cools the water making it freeze more quickly.

warm water evaporates rapidly and since this is an endothermic process, it cools the water making it freeze more quickly.

When copper is hammered into a sheet what type of change has the matter gone through?

Answers

Physical change since it's getting physically hammered into a sheet

Physical because it is malleable, which is a physical property. It hasn't been changed unto a different substance

What is relativity exactly

Answers

the absence of standards of absolute and universal application.

Explain why atoms move at different speeds depending on whether they are liquids or solids.

Answers

The space between the particles allows them to do so.

Example, a solid's particles are squished together, so it appears as a solid shape.

Which compound will form from the bonding of CA and N ca3N2, Ca2N3, Ca2N2, caN

Answers

Answer:

Ca3N2

Explanation:

Ca+2

N-3

Criss cross the charges to get Ca3N2

How could you separate items that are different densities? Explain.

Answers

If they are liquids, you can pour them all into one container and they will separate themselves into different layers according to their density. The liquid with the lowest density will rise to the top.

Final answer:

Items of different densities can be separated by methods like the density column or using a liquid medium with a density in between the solids. High-density items sink, and low-density items float, enabling easy separation.

Explanation:

You can separate items of different densities by using a method called density column. This method involves stacking liquids of different densities on top of one another. For example, if you have oil and water, both liquids would not mix due to their different densities. Water has a higher density than oil, so oil will float on top of the water. You then could separate the two by carefully siphoning off the oil on top.

Similarly, if you have a mixture of solids with different densities, you can use a liquid medium that has a density between the two solids. The solid with the higher density will sink, whereas the solid with a lower density will float, allowing for easy separation.