Solids: wood, plastic, metals
Liquids: water (H2O), soap, juice, milk
Gases: Air, water vapour (H2O), carbon dioxide (CO2)
An element: gold, silver, aluminum, copper, nickel, iron, nitrogen in the air
A compound: salt (NaCl), carbon dioxide (CO2)
A homogenous mixture: air, water with sugar or salt dissolved in it
A heterogeneous mixture: orange juice with pulp, cereal in milk
Pure substances: diamond, water, salt, baking soda, sugar
Answer: The answer is 185 Pm
The correct answer is: 6.173 seconds.
Explanation:
The formula for half life (of reaction) is:
Half-life =
--- (A)
Where,
K = Rate constant = 0.54 ![\frac{1}{ms}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7Bms%7D)
I = Initial concentration = 0.30 m
Plug in the values in equation (A):
Half-life = ![\frac{1}{0.54*0.30} = 6.173](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B0.54%2A0.30%7D%20%3D%206.173)
Hence, the half life is 6.173 seconds.
Answer:
B) The molecular orbital formed is lower in energy than a hydrogen 1s atomic orbital.
Explanation:
When two atoms of hydrogen come close to each other , there is formation of molecular orbital . Due to overlap of 1 s orbital of one and 1 s orbital of another atom , two molecular orbitals are formed . One of these molecular orbital has energy less than 1 s atomic orbital . It is called 1 s sigma bonding molecular orbital . The other molecular orbital has energy more than 1 s atomic orbital . It is called antibonding molecular orbital . Two electrons occupy bonding sigma molecular orbital .
So , the statement that "the molecular orbital formed is lower in energy than a hydrogen 1s atomic orbital " is wrong .
Answer:
Y is a gamma ray in a nuclear equation, which y equals 0.