Answer:
Since the noble gases are unreactive or inert, they are safe to use. Helium is used to fill balloons and airships, because it is much lighter that air and it will not catch fire. Neon is used in advertising signs. It will give red glow, but the color can be changes by mixing it with other gases.
Explanation:
Answer:
P= 0.87g/mL or 0.87g/cm^3
Explanation:
P=m/v
P=density
P=17.4g/20mL
P= 0.87g/mL
1mL=1cm^3
Its a chemical element with symble
Answer:
The answer is D- creation of atmospheric systems that provide oxygen while absorbing carbon dioxide
Explanation:
By using elimination of choice that answer seems the most accurate.
We substitute the enthalpies for the reactants in the equation:
101 + 142.3 = ΔH + 247.5
ΔH = -4.2 kJ/mol