Determining an equation experimentally: sodium hydrogencarbonate | Starter Quiz | Oak National Academy
Quiz
•
Science
•
9th Grade
•
Hard
Oak National Academy
FREE Resource
6 questions
Show all answers
1.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
The formula for sodium hydrogen carbonate is NaHCO₃. Which of the following statements about sodium hydrogen carbonate are correct?
The ratio of sodium to oxygen is 1 : 3.
The ratio of hydrogen to oxygen is 3 : 1.
The ratio of carbon to sodium is 1 : 1.
The ratio of oxygen to carbon is 1 : 3.
Answer explanation
Ratios are used to compare two or more quantities. The ratio needs to be written in the same order as in the statement, with the : representing 'to'. For example, the ratio of carbon to oxygen would be written as carbon : oxygen or 1 : 3.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the ratio of sodium hydrogen carbonate to water in the following equation? 2NaHCO₃ → Na₂O + 2CO₂ + H₂O.
2 : 1
1 : 2
2 : 2
3 : 2
Answer explanation
The coefficient in front of sodium hydrogen carbonate is 2 and there is no coefficient in front of water which means the ratio of sodium hydrogen carbonate to water is 2 : 1.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following equations shows the correct relationship between moles, mass and relative mass?
mass = moles × relative mass
moles = mass × relative mass
relative mass = mass × moles
moles = relative mass ÷ mass
Answer explanation
The mass of a substance is equivalent to the moles multiplied by the relative atomic mass or relative formula mass of the substance.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What type of reaction does the following chemical equation represent? CuCO₃ → CuO + CO₂.
oxidation
thermal decomposition
combustion
neutralisation
Answer explanation
There is one reactant that is broken down into two products using heat, so this is a thermal decomposition reaction.
5.
FILL IN THE BLANK QUESTION
1 min • 1 pt
Calculate the relative formula mass of sodium hydrogen carbonate, NaHCO₃. Relative atomic masses: Na = 23; H = 1; C = 12; O = 16.
Answer explanation
RFM = 23 + 1 + 12 + (3 × 16) = 84
6.
FILL IN THE BLANK QUESTION
1 min • 1 pt
Calculate the mole sof 4.2 g of sodium hydrogen carbonate, NaHCO₃. Relative formula mass of NaHCO₃ = 84.
Answer explanation
moles = mass ÷ relative mass, moles = 4.2 g ÷ 84, moles = 0.05 mol
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