Helium is a gas at room temperature, which means it can be used in balloons to make them float since helium is less dense than air. Hope this helps! :)
The word is 'Observation'. It fits the given definition, begins with the letter 'O' and is 11 letters long.
It started at 18 degrees and increased to 24 degrees.
24 - 18 is 6
So there was a 6 degree increase in temperature.
Alkanes are saturated hydrocarbon, that is they contain hydrogen and carbon without a double or triple bond between the carbon atoms, e.g. ethane, propane. Group 7a in the periodic table are called halogens e.g chlorine, bromine. Alkanes react with halogens in a reaction called substitution, where halogens replace hydrogen atoms in alkanes.
Answer:
first of all is that really chemistry
