Chemical Equations
Chemistry ⇒ Chemical Reactions and Equations
Chemical Equations starts at 7 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Chemical Equations.
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See sample questions for grade 8
A student writes: 2Na + 2H_2O \rightarrow 2NaOH + H_2. How many sodium atoms are present on the product side?
Balance the following equation: \_\_\_Al + \_\_\_O_2 \rightarrow \_\_\_Al_2O_3
Balance the following equation: \_\_\_C_2H_6 + \_\_\_O_2 \rightarrow \_\_\_CO_2 + \_\_\_H_2O
Balance the following equation: \_\_\_Na + \_\_\_Cl_2 \rightarrow \_\_\_NaCl
Explain why it is incorrect to balance a chemical equation by changing the subscripts in chemical formulas.
If 2H_2 + O_2 \rightarrow 2H_2O, how many molecules of water are produced when 4 molecules of hydrogen react with 2 molecules of oxygen?
In a chemical equation, what does a double arrow (⇌) indicate?
In the equation 2Mg + O_2 \rightarrow 2MgO, how many atoms of oxygen are present on the reactant side?
What do the coefficients in a chemical equation represent?
What does the symbol (aq) mean in a chemical equation?
What is a chemical equation?
What is meant by the term 'product' in a chemical equation?
What is meant by the term 'reactant' in a chemical equation?
What is the product formed when calcium reacts with water? Write the chemical equation.
What is the purpose of balancing a chemical equation?
Write the balanced chemical equation for the reaction between hydrochloric acid and sodium hydroxide.
Write the balanced chemical equation for the reaction of carbon dioxide with water to form carbonic acid.
A chemical equation is written as: 2SO_2 + O_2 \rightarrow 2SO_3. If you start with 4 molecules of SO_2, how many molecules of SO_3 will be produced?
Describe the difference between a word equation and a chemical equation, giving an example of each.
Explain why the equation: H_2 + O_2 \rightarrow H_2O_2 is not a correct representation of the reaction between hydrogen and oxygen to form water.
