Question

question 9
1 pts
to balance a chemical equation,__________are added stepwise before
reactants and products to ensure that the number of atoms of each element are
the same on both the reactant and product side.
o coefficients
o molar masses
o subscripts
o superscripts
question 10
1 pts
sometimes fractions are used as intermediate coefficients. subsequently the
entire equation is multiplied by a(n)__________to convert the fractional
coefficients to integers without upsetting the atom balance.
o imaginary number
o fraction
o exponent
o whole number

Explanation:

• For Question 9: Chemical equations are balanced by adding coefficients. Coefficients are multipliers placed before reactants and products. They change the number of molecules/atoms of a substance without changing the substance itself (unlike changing sub - scripts which would change the identity of the substance). Molar masses are related to the mass of substances (grams per mole) and superscripts are used for charges (in ions) or other notations not for balancing atom counts.
• For Question 10: When fractions are used as intermediate coefficients in a chemical equation, we multiply the entire equation by a whole number. For example, if we have \(\frac{1}{2}O_2\) in an equation, multiplying the whole equation by 2 will convert it to \(O_2\) (an integer coefficient). Imaginary numbers are not used in chemical equation balancing. Multiplying by a fraction would not convert the fractional coefficients to integers (it might make them more fractional). Exponents are not relevant for this operation of converting fractional coefficients to integers while maintaining atom balance.

Answer:

Question 9: coefficients
Question 10: whole number