Chemical Reactions and Equations_LS_4

Point to remember about coefficient and subscripts while balancing a chemical equation.

• If possible, start with an element found in one compound on each side of the equation.

• Balance chemical formulas by placing coefficients in front of them. Do not add subscripts, because this will change the formulas.

• You can change the subscript in a chemical equation

Point to remember about coefficient and subscripts while balancing a chemical equation.

• If possible, start with an element found in one compound on each side of the equation.

• You can change the subscript in a chemical equation

• Remember, coefficients are multipliers,

• Coefficients are whole number multipliers. If, for example, you write 2 H₂O, that means you have 2 x 2 = 4 hydrogen atoms and 2 x 1 = 2 oxygen atoms in each water molecule, which would be 4 hydrogen atoms and 2 oxygen atoms.

Point to remember about coefficient and subscripts while balancing a chemical equation.

When you see a formula like 2Ca(OH)_{2, which of the statements are true}

• 2Ca(OH)_2, ---> there are 1 x 1 x 2 atoms of oxygen (a total of 4), there are 2 x 1 x 2 atoms of hydrogen (a total of 4), and 2 x 1 atoms of Calcium (a total of 2).

• it means that the O and the H are to be considered a single unit.

• The 2 means that 2 of these units are attached to the clacium (Ca) atom.

• The 2 subscript applies to everything inside the parentheses.

• So, when you do the math, a single Ca(OH)₂ is 1 Ca, 2 O, and 2 H.

AgNO3​(aq)+NaCl(aq)→AgCl(s)+NaNO3​(aq) What will you balance first in the equation?

• Metals

• Non-metals

• Oxygen

• Hydrogen

AgNO3​(aq)+NaCl(aq)→AgCl(s)+NaNO3​(aq) Name the metals in the chemical equation?

• Sodium (Na)

• Silver (Ag)

• Nitrogen (N)

• Chlorine (Cl)

• Oxygen (O)

AgNO3​(aq)+NaCl(aq)→AgCl(s)+NaNO3​(aq) Name the non-metals in the chemical equation?

• Sodium (Na)

• Silver (Ag)

• Nitrogen (N)

• Chlorine (Cl)

• Oxygen (O)

AgNO3​(aq)+NaCl(aq)→AgCl(s)+NaNO3​(aq) In this equation:

• The number of elements in the reactant and product side are equal. It does not require balancing.

• Silver Nitrate + Sodium Chloride = Silver Chloride + Sodium Nitrate

• AgNO3 and NaCl are the reactants while AgCl and NaNO3 are the products.

NaOH+H2​SO4​→Na2​SO4​+H2​O. Balance the given chemical equation. Name the metals in the chemical equation.

• Sodium (Na)

• Hydrogen (H)

• Sulfur (S)

• Hydrogen (H)

• Oxygen (O)

NaOH+H2​SO4​→Na2​SO4​+H2​O. Balance the given chemical equation. Number of sodium atoms on the reactant side, in the given equation.

• 1

• 2

• 4

NaOH+H2​SO4​→Na2​SO4​+H2​O. Balance the given chemical equation. Number of sodium atoms on the product side, in the given equation.

• 1

• 2

• 4