Chemistry Balancing Equations Quiz

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Questions and Answers

What type of reaction is represented by the equation Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)?

Combination reaction (correct)

Double replacement reaction

Single replacement reaction

Decomposition reaction

Which of the following reactions is exothermic?

N2(g) + H2(g) → NH3(g)

CaCO3(s) → CaO(s) + CO2(g)

C(s) + O2(g) → CO2(g) (correct)

H2O(l) → H2(g) + O2(g)

What product is formed in the exothermic reaction during respiration?

Oxygen

Carbon dioxide (correct)

Nitrogen

Glucose

Which of the following is NOT a characteristic of combination reactions?

They always produce gas as a product. Signup and view all the answers

Which equation represents an example of a combination reaction?

2H2(g) + O2(g) → 2H2O(l) Signup and view all the answers

What is released during exothermic reactions?

Heat energy Signup and view all the answers

What is the primary product of the combustion of natural gas?

Carbon dioxide Signup and view all the answers

Which of the following represents a decomposition reaction?

2H2O(l) → 2H2(g) + O2(g) Signup and view all the answers

What color does silver chloride turn when exposed to sunlight?

Grey Signup and view all the answers

What is produced when silver chloride decomposes in sunlight?

Silver metal and chlorine gas Signup and view all the answers

Which reaction is common in black and white photography?

Decomposition of silver chloride Signup and view all the answers

What type of reactions require energy to break down reactants?

Endothermic reactions Signup and view all the answers

What happens when barium hydroxide reacts with ammonium chloride?

Cooling sensation is felt Signup and view all the answers

What is the result of the reaction between substance 'X' used in whitewashing and water?

Production of calcium hydroxide Signup and view all the answers

Why is one of the test tubes in Activity 1.7 collecting double the amount of gas compared to the other?

Unequal amounts of reactants Signup and view all the answers

What is the chemical representation for the decomposition of silver bromide in light?

2AgBr(s) → 2Ag(s) + Br2(g) Signup and view all the answers

What process describes the formation of a reddish brown powder on iron articles when left exposed to moisture?

Corrosion Signup and view all the answers

Which of the following describes the effect of oils and fats when they oxidize?

They become rancid Signup and view all the answers

What preventative measure can be taken to slow down the oxidation of food containing fats and oils?

Add antioxidants Signup and view all the answers

What is the significance of the black coating on silver products?

It is a sign of oxidation Signup and view all the answers

Which gas is used by chips manufacturers to prevent oxidation in packaged chips?

Nitrogen Signup and view all the answers

What type of chemical reaction is demonstrated when copper reacts with hydrogen?

Single displacement reaction Signup and view all the answers

Why is corrosion of iron a serious issue?

It leads to structural damage and financial loss Signup and view all the answers

Which of the following is not a common example of corrosion?

Polishing of gold Signup and view all the answers

What is the final balanced equation from the provided information?

3 Fe + 4 H2O → Fe3O4 + 4 H2 Signup and view all the answers

Which element was the last to be balanced in the equation?

Iron Signup and view all the answers

How many hydrogen atoms are initially present in the reactants?

8 Signup and view all the answers

What method is used to balance the chemical equation in the content?

Hit-and-trial method Signup and view all the answers

What is the coefficient for hydrogen gas in the balanced equation?

4 Signup and view all the answers

Which part of the balanced equation does not contain information about physical states?

Both reactants and products Signup and view all the answers

What was done to balance the hydrogen atoms in the given chemical equation?

Increase the number of H2 molecules Signup and view all the answers

What does the balanced equation reveal about the relationship between reactants and products?

Mass is conserved Signup and view all the answers

What is the white precipitate formed when sodium sulfate and barium chloride solutions are mixed?

Barium sulfate Signup and view all the answers

Which statement best describes a double displacement reaction?

Ions are exchanged between two compounds in solution. Signup and view all the answers

What happens to sodium chloride in the reaction between sodium sulfate and barium chloride?

It remains dissolved in the solution. Signup and view all the answers

Which of the following reactions is an example of a double displacement reaction?

NaCl + AgNO3 → AgCl + NaNO3 Signup and view all the answers

What causes the formation of copper(II) oxide when copper powder is heated?

Addition of oxygen to copper Signup and view all the answers

What is the primary observable change in copper powder when it is heated?

It turns black due to oxidation. Signup and view all the answers

What is the general equation for the reaction that occurs when sodium sulfate reacts with barium chloride?

Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq) Signup and view all the answers

In a double displacement reaction, what typically happens to the ions in the reactants?

They are exchanged between the two reacting compounds. Signup and view all the answers

Study Notes

Balancing Chemical Equations

A partly balanced equation may still have unbalanced atoms of some elements.
To balance a chemical equation, ensure the number of atoms of each element is the same on both sides.
The hit-and-trial method balances equations by using the smallest whole number coefficients.
To increase the number of atoms of an element on a particular side, adjust the coefficient of the molecule containing that element.
Physical states of reactants and products can be shown in a chemical equation using:
- (s) for solid
- (l) for liquid
- (g) for gas
- (aq) for aqueous solution

Types of Chemical Reactions

Combination Reactions: Two or more substances combine to form a single product.
- Burning of coal: C(s) + O2(g) → CO2(g)
- Formation of water: 2H2(g) + O2(g) → 2H2O(l)
- Respiration is an exothermic reaction that provides energy for living organisms: C6H12O6(aq) + 6O2(aq) → 6CO2(aq) + 6H2O(l) + energy
- Decomposition of vegetable matter into compost is also an exothermic reaction.
Decomposition Reactions: A single substance breaks down into two or more simpler substances.
- Decomposition of silver chloride in sunlight: 2AgCl(s) → 2Ag(s) + Cl2(g)
- Decomposition reactions typically require energy in the form of heat, light or electricity.
Displacement Reactions: A more reactive element displaces a less reactive element from its compound.
Double Displacement Reactions: An exchange of ions occurs between two reactants in a solution, often resulting in the formation of a precipitate.
- Reaction between sodium sulphate and barium chloride: Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq)
Oxidation and Reduction Reactions: Oxidation involves the gain of oxygen or loss of hydrogen, while reduction involves the loss of oxygen or gain of hydrogen.

Everyday Life Applications

Corrosion: The deterioration of metals due to chemical reactions with substances like moisture and acids.
Rancidity: The oxidation of fats and oils, causing changes in smell and taste.

Key Points to Remember

A balanced chemical equation represents reactants, products, and their physical states symbolically.
Understanding the different types of chemical reactions and their everyday applications is crucial to understanding chemistry.
The study of chemical reactions opens doors to a vast world of scientific exploration and technological advancements.

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Description

Test your knowledge on balancing chemical equations and identifying types of chemical reactions. This quiz will challenge you to apply the hit-and-trial method and understand the physical states of reactants and products. Prepare to dive into the fascinating world of chemistry and sharpen your skills!