Balancing Chemical Equations

Front

Is the equation Fe + S --> FeS balanced or unbalanced?

Back

balanced

Front

True or False: When balancing chemical equations the subscripts can change.

Back

false

Front

Which of the Following Correctly Balances this Equation?
_H ₂ + _Cl ₂ --> _HCl
Options: 2H ₂  + Cl ₂ --> 4HCl, H ₂ +Cl ₂ --> 2HCl, 3H ₂  + 3Cl ₂  --> HCl, H + Cl --> HCl

Back

H ₂ +Cl ₂ --> 2HCl

Front

When balancing equations, a ____ can be placed to the left of a formula of a substance to make the equations balanced.

Back

coefficient

Front

When balancing equations, what does
 -->
mean?

Back

yield

Front

Classify the following chemical reaction:
4P +5O ₂  --> P ₄ O ₁₀
Options: single replacement, double replacement, synthesis, decomposition

Back

synthesis

Front

Which of the following is an unbalanced equation? Options: CaCO₃--> CaO + CO₂, PbO₂+ 2H₂-->2Pb + H₂O, 2Na+ 2H₂O-->2NaOH + H₂, CS₂+ 2O₂--> CO₂+ 2SO₂

Back

PbO₂+ 2H₂-->2Pb + H₂O

Front

Which of the following is an example of synthesis? Options: Na + Br ₂  --> NaBr, KClO ₃  --> KCl + O ₂, HgO + Cl ₂ -->HgCl + O ₂, Cl ₂ + NaBr --> NaCl + Br ₂

Back

Na + Br ₂  --> NaBr

Front

Which of the following is evidence of a chemical reaction? Options: fizzing, water changing to ice, saltwater, paper being cut in half

Back

fizzing

Front

What coefficient should be used to make the following equation balanced?
N₂+O₂--> _NO 

Back

2