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ENERGY: Action of electricity on materials
ENERGY: Action of heat on materials
MATTER - PROPERTIES AND TRANSFORMATION: Chemical Reactions And Equations
MATTER - PROPERTIES AND TRANSFORMATION: Chemical Symbols, Formulae And Valency
MATTER - PROPERTIES AND TRANSFORMATION: Effect Of Heat On Substances
MATTER - PROPERTIES AND TRANSFORMATION: Introduction To Chemistry - Symbols
MATTER - PROPERTIES AND TRANSFORMATION: Mixtures And Pure Substances
MATTER - PROPERTIES AND TRANSFORMATION: Periodic table - Families of elements and Relative reactivity
MATTER - PROPERTIES AND TRANSFORMATION: Reaction With Oxygen of air
MATTER - PROPERTIES AND TRANSFORMATION: The Atom And Sub-Atomic Particles

In the word equation: Hydrogen + Oxygen → Water. What are the reactants?

Hydrogen and Oxygen.

Water.

Only Oxygen.

Only Hydrogen.

When hydrochloric acid reacts with sodium carbonate, bubbles are observed. What gas is causing the bubbles?

Oxygen.

Hydrogen.

Chlorine.

Carbon dioxide.

Why must chemical equations be balanced?

To simplify the equation for reading.

To show the physical states of reactants.

To indicate the speed of the reaction.

To satisfy the Law of Conservation of Mass.

In a chemical reaction, the substance or substances formed are called:

Products.

Reactants.

Produce.

React.

A reaction in which a compound is broken down into simpler substances is called:

Oxidation.

Combination.

Displacement.

Decomposition.