when a log of wood burns, it undergoes a _______. a. physical change. b. chemical change. c. physical and a chemical change. d. no physical or chemical change.

Answer : The number of oxygen atoms present on reactant side are, 4

Explanation :

Balanced chemical reaction : It is defined as the number of atoms of individual elements present on reactant side must be equal to the product side.

Decomposition reaction : It is defined as the reaction in which the larger molecule decomposes to give two or more smaller molecules as a product.

The given balanced chemical reaction is,

From the balanced chemical reaction we conclude that, there 4 atoms of hydrogen and 2 atoms of oxygen present on both reactant side and product side.

Hence, the number of oxygen atoms present on reactant side are, 4

Answer:

This reaction is completed by a double displacement

A double displacement occurs when two different salts are mixed in an aqueous state, since when they dissolve a salt their ions are dissociated and when mixed with another salt in an aqueous state they combine and form two new compounds

Double displacement reactions

 In order to balance this, you have to count each element where the elements in the reactants side and the product side should have equal number of molecules. The balanced reaction is as follows:

P4(s) + 6Cl2(g) =  4PCl3(l) 

Thus, the answer is 4.

Answer:

4

Explanation:

I got it right on edge

Answer:

First box: 3

Second box: 4

Third box: 3

Fourth box: 4

Explanation:

I tried out various numbers, but got 3 and 4 because:

3PbI4 + 4CrCl3 -----> 3PbCl4 + 4CrI3

Each term cancels put.

3Pb --> 3Pb

4Cr --> 4Cr

and so forth...

Hope this helps!