Adding a catalyst to a chemical reaction results in a decrease in activation energy and an increase in the reaction rate.
because they need a medium to travel they can travel everywhere if they got the medium
Answer:
3.2L
Explanation:
PV=nRT
since pressure and temperature are held constant we have V=nR
R is a constant also,
Thus; 
v1=1.5L , n1=3mol, n2=1.4mol
v2=
v2=3.2L
Below are the choices and the answer is 1 and 4.
1. There are differences in molecular size and shape and thus in the strength of dispersion forces.
<span>2. There are differences in the molecular dipoles of the molecules. </span>
<span>3. There is increased hydrogen bonding with an increasing number of hydrogen atoms. </span>
<span>4. There are differences in bonding between atoms within the molecules. </span>
Long year ago In space, gravity attracts dust and gas together which created the young solar system. It pulled low-density cloud together to produce initially the solar nebula. These clouds are made of interstellar gas and dust.
The sun formed first from these nebula and dust.
Planetesimals is just a process indicates the formation of Earth and the other planets from concentrations of dust and diffused matter in the solar system.
Inner planets are the planets located closure to the sun in comparison to outer planets. These inner planets are mercury, venus, earth and mars. Thus, 4.5 billion year ago Inner planets formed at last.
