H2 is the molecule of two Hydrogen atoms. The 4 means that there are 4 of the molecules. ■
The general term of the sequence 2, 4, 2, 4, 2, 4 is repeating number sequence.
The answer is (2-4)
x-2(x)+4/x^2 -4=x-2x+4/x^2 -4=-x-4+4/x^2
4!/(2!*2!) = 4*3*2*1/(2*1*2*1) = 6 4!/(2!*2!) = 4*3*2*1/(2*1*2*1) = 6 4!/(2!*2!) = 4*3*2*1/(2*1*2*1) = 6 4!/(2!*2!) = 4*3*2*1/(2*1*2*1) = 6
-2
The 4 in 4H2 stand for "4" molecules in that equation, unless specified as being moles.
The meaning of 4 H2 is four molecules of hydrogen.
white oval with a 4I
O2 +4H2--> 2H2O
You're probably looking for "heroine," but the first two letters are male and the first three are female. He Her Hero Heroine
== == == == == == well, the answer is heroine. 1st 2 - he; signifies male. 1st 3 - her; signifies female. 1st 4 - hero; signifies a great man whole word - woman hero.Heroine He - Male Her - Female Hero - Great Man Heroine - Great Woman
bar is unit of pressure
2Ag20 --> 4Ag + 02 Fe304 + 4H2 --> 4H20 + CuCl2
4H2 + N2 --> 2H4N+
2C+2H4=2CH4(instead of 'equal to' use 'arrow sign').
C6H12 + Cl2 --> C6H12Cl2
Yes. Except that the word is equals, not eqauls.