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For the reaction NH3 + NO → N2 + H2O, identify the reactants, products, and their coefficients once the equation is balanced.
Reactants: 4NH3 and 6NO; products: 5N2 and 6H2O
Fill in the blank with the correct number to balance the equation: ___KClO3 → 2KCl + 3O2.
2
A chemical equation is shown:
C2H4 + O2 → CO2 + H2O
According to the law of conservation of mass, how many atoms of oxygen exist in the products of this reaction?
6
Which of the following laboratory procedures best illustrates the law of conservation of mass?
Synthesizing 36 g of H2O plus leftover reactants by combining 4 g of H2 and 32 g of O2
Match each subscript symbol to its correct meaning.
Match | Term | Definition |
|---|---|---|
(g) | A) Aqueous solution | |
(l) | B) Gas | |
(aq) | C) Liquid |
B
C
A
An unbalanced chemical equation is shown:
H2O2 → 2H2O + O2
Which of the following statements explains why the equation is not balanced?
Two H2O2 molecules should decompose to form the given products.
Which chemical equation correctly represents the reaction that takes place when nitrogen gas and hydrogen gas are formed as ammonia decomposes?
2NH3(g) → N2(g) + 3H2(g)
The reaction CO2(g) → C(s) + O2(g) is a decomposition reaction.
True
Which of the following is a synthesis reaction?
SO3 + H2O → H2SO4
What is true of a decomposition reaction?
The addition of energy in the form of heat or electricity is often required.
A synthesis reaction can be identified because it involves more than one reactant forming one compound as the product.
True
Which of the following is a single replacement reaction?
Fe + 3NaBr → FeBr3 + 3Na
When HNO3 and Au are mixed together, what do you expect to happen, and why?
No reaction, because Au is lower on the activity series and cannot replace H
A single replacement reaction is a reaction in which one element replaces a similar element within a compound.
True
The table shows the nature of reactants and products formed in a certain type of chemical reaction.
Nature of Reactants and Products |
Reactants | Products |
Metal + Ionic compound | Metal + Ionic compound |
Which of the following is true about the type of chemical reaction?
It is a single replacement reaction, and the cations in the two ionic compounds are different.
When Pb and AlCl3 react together, lead (Pb) can replace aluminum (Al) in the compound because lead is lower on the activity series.
False
Potassium hydroxide (KOH) reacts with sulfuric acid (H2SO4) to produce potassium sulfate (K2SO4) and water.
What best describes this reaction?
A double replacement reaction occurs because potassium ions bond with sulfate ions to form a salt.
In a redox reaction, the oxidizing agent gains electrons.
True
All redox reactions form ionic bonds.
False
Why are redox reactions used in batteries?
The movement of electrons creates an electric current.
What does it mean when an element is reduced?
It gains electrons, reducing its overall charge.
In which of the following reactions is chlorine (Cl) oxidized?
Br2 + 2Cl− → Cl2 + 2Br−
Note 
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