Explain reasons why

helium is used to fill balloon instead of hydrogen having a lighter weight

What is the volume (in liters) of a 4.00 m solution needed to make 250 ml of a 0.400 m solution?

What is the molar mass for H2O3

True or False. When covalent bonds are formed between atoms having different electronegativities, the electrons tend to spend less time at the atom with the greater electronegativity. Such chemical bonds are called polar covalent bonds.

On the surface cost benefit analysis seems straightforward

What is the gravitational force acting on an object that has a mass of 10.0 kg

What larger energy does light energy come from?

Allows water to pass through easily

Which is a cause of desertification? A. farming B. creating reservoirs C. overgrazing D. driving motor vehicles

What happens when the threat of exposure to dirty air is reduced in a community? There is enough oxygen available for people's lungs to function normally The amount of indoor air pollutants released during a fossil fuel burn decreases There is a

Is chicken noodle soup an element, a compound, a homogeneous mixture, or a heterogeneous mixture?