Charlie is balancing an equation. She has identified the atoms and counted the nurmber of each in the reactarts and products. What would Charlie adjust to make the number of atoms in the reactants the same as the atoms in the products?

$"Density,"$ $rho="Mass"/"Volume"$, and thus it has the units of $g*mL$ or $g*cm^-3$.

$Z$, $"the atomic number"$ of magnesium is 12. This means that there are 12 positively charged nuclear particles. This defines the particle as a magnesium atom. To represent the $""^24Mg$...

This chemical equation is a little tricky to balance if you don't want to use , which is assume is the case here. The first thing to look for...

The balancement of the reaction requires the conservation of mass, each atom of carbon in $C_4H_8$ consumes one $O_2$ molecule, and every two atoms of hydrogen one oxygen atom is...

Consider the combustion of alkanes, methane for a start: $CH_4(g) + 2O_2(g) rarr CO_2(g) + 2H_2O(g)$ The stoichiometric coefficients (from the left the $1$, the $2$, the $1$, the $2$)...

Subscripts tell us how many atoms there are within a compound. The coefficient tells us how many of the compound we have. So, if you multiply 2 by 4,...

$underbrace(2K(s) + 2H_2O(l))_"114.2 g of reactants" rarr underbrace(2KOH(aq) +H_2(g)uarr)_"114.2 g of products"$ , the principle that garbage in equals garbage out, insists that mass is conserved, and the equation necessarily...

So, you know that Lisa must mix either calcoium oxide, $"CaO"$, or phosphorus pentoxide, $"P"_4"O"_10$, with water in order to produce an acid. SIDE NOTE Phosphorus pentoxide is just...

Mass is a measure of the number of particles. Here you have $O$ atoms, and dioxygen, $O_2$, and ozone molecules, $O_3$ but each have the same mass by specification. There...

Here is my reasoning. Let's treat the heat as a product and rewrite the equation as $"Ca"("NO"_3)_2"(aq)" + "CO"_2"(g)" + "2NaOH(aq)" ⇌ "CaCO"_3"(s)" + "2NaNO"_3"(aq)" + "H"_2"O(l) + heat"$...