HERE Balance the following equations by inserting the proper coefficients.
CH4 +
102 → CO2 + H20
CaCl2 +
AgNO3 → Ca(NO3)2 +Agci
C2H60+
+
02
co2+ H20

CH4 + 2O2 ==> CO2 + 2H2O

CaCl2 + 2AgNO3 ==> Ca(NO3)2 + 2AgCl

C2H6O + 2O2 ==> 2CO2 + 3H2O

Explanation:

Important concept.

Coefficients : the big number which represents the number of molecules in an equation. we multiply the coefficient by the subscript of an element to find the number of atoms of that specific element. ex 2H3O2 To find the number of hydrogen atoms we multiply the coefficient 2 by the subscript after H 3. 3 x 2 = 6. there are 6 hydrogen atoms in 2H302

1.) CH4 + O2 ==> CO2 + H2O

First we must balance the number of hydrogen atoms on both sides. There are two hydrogen atoms on the right side but 4 hydrogen atoms on the left side. We can balance the number of hydrogen atoms by adding a coefficient of 2 to H2O.

We now have CH4 + O2 ==> CO2 + 2H2O

Next we must balance the number of Oxygen atoms. There are 2 oxygen on the right side and 4 on the left side. we can easily balance it by adding a coefficient of 2 to O2 to the right side

CH4 + 2O2 ==> CO2 + 2H2O

The equation is now balanced.

2.) CaCl2 + AgNO3 ==> Ca(NO3)2 + AgCl

==> balance # of Nitrogen and Oxygen atoms by adding a coefficient of 2 to AgNO3

CaCl2 + 2AgNO3 ==> Ca(NO3)2 + AgCl

==> balance # of Argon and Chlorine atoms by adding a coefficient of 2 to AgCl

CaCl2 + 2AgNO3 ==> Ca(NO3)2 + 2AgCl

The equation is now balanced.

3.) C2H6O + O2 ==> CO2 + H2O

==> balance the # of hydrogen atoms by adding a coefficient of 3 to H2O

C2H6O + O2 ==> CO2 + 3H2O

==> balance the number of carbon atoms by adding a coefficient of 2 to CO2

C2H6O + O2 ==> 2CO2 + 3H2O

balance the number of Oxygen atoms by adding a coefficient of 2 to O2

C2H6O + 2O2 ==> 2CO2 + 3H2O

The equation is now balanced.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.