Tema
Q:
\( \left. \begin{array} { l } { 2 Mg + O _ { 2 } \rightarrow - \cdots 2 MgO } \\ { Ca ( OH ) _ { 2 } \cdots \rightarrow CaO + H _ { 2 } O } \end{array} \right. \)
Q:
Element \( X \) has a molar mass of 84.18 and element \( Z \) has a molar mass of 80.05 .
What is the percent composition of element \( X \) in the compound \( X_{4} Z_{5} \) ?
Give your answer to the hundredths place. Do not put units in the answer
space.
Q:
Question 22
Sodium bicarbonate, \( \mathrm{NaHCO}_{3} \), is the active ingredient in baking soda. What is
the mass percent of H in sodium bicarbonate?
Use the periodic table provided with the quizzes for your masses and give your
answer to two decimal places.
Q:
Sodium bicarbonate, \( \mathrm{NaHCO}_{3} \), is the active ingredient in baking soda. What is
the mass percent of C in sodium bicarbonate?
Use the periodic table provided with the quizzes for your masses and give your
answer to two decimal places.
Q:
Balance the following equation. Use the lowest whole number ratio and type in
1 when it is the coefficient.
\( \mathrm{CO}_{2}+\square \)
Q:
\( \mathrm{NaClO}_{3} \rightarrow \underset{\text { If }}{\mathrm{NaCI}}+\mathrm{O}_{2} \)
Q:
Balance the following equation. Use the lowest whole number ratio and type in
the number 1 when it is the coefficient.
\( \mathrm{BaO}+\square \)
Q:
Balance the following equation. Use the lowest whole number ratio and type in
1 when it is the coefficient.
\( \mathrm{MgSO}_{4}+\square \mathrm{KCl}_{\text {-. }} \)
Q:
Balance the following equation. Use the lowest whole number ratio and type in
1 when it is the coefficient.
\( \mathrm{Oe}_{2} \mathrm{O}_{3} \rightarrow+\square \)
Q:
Balance the following equation. Use the lowest whole number ratio and type in
1 when it is the coefficient.
\( \mathrm{SO}_{2}++ \)
H
\( \mathrm{H}_{2} \mathrm{O} \rightarrow- \)
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