Answer:
I think that's a physical change since nothing is getting it's properties changed.
Explanation:
a chemical change usually changes the properties and cannot be changed back, this is simply washing your hands so I would guess that a physical change. think of like putting water on paper, the properties aren't changed you just have a paper with water on it now and can be easily dried.
Explanation:
hope the picture make sense :)
Answer:
The wavelength of the radio wave is 3.003 m.
The energy of the radio wave is
.
Explanation:
Frequency of the radio waves, ν = 99.9 MHz = 
Wavelength and frequency are related to each other by realtion:

= Wavelength of the wave
c = speed of the light
ν = Frequency of the wave

The wavelength of the radio wave is 3.003 m.
The energy of the electromagnetic wave is given by Planck's equation:

h = Planck's constant = 
The energy of the radio wave with 99.9 MHz frequency will be:


The energy of the radio wave is
.
this is so ez,
ok so here what u'll do after u balance the equation:
1. convert grams of oxygen to moles of oxygen.
2. convert moles of oxygen to moles of water
3. convert moles of water to grams of water.
4. bOOm... that's your answer
as follows:
2H2O(l)===>2H2(g)+O2(g)
1. 151200(g)/16(g/mol)=9540 moles of O2
2. 9450 moles of O2 × 2 moles of H2O =18900 moles of H2O
3. 18900 moles of H2O × 10g/mol = 189000g of H2O is required.
d= 8/10 so yah that was a guess