Actually there are several possible answers to that question. Sodium and water produce a gas (hydrogen). Potassium cyanide and hydrochloric acid produce a gas (cyanogen). Etc.
air and gas
Salt and Water
Water does not produce oxygen gas through decomposition. Hydrogen peroxide and potassium chlorate do produce oxygen gas when they decompose.
Water And Salts
No, mixing baking soda with ammonia can produce a toxic gas called chloramine which can be harmful to breathe in. It is best to avoid mixing these two substances together.
A deadly gas, such as hydrogen cyanide, can be formed when a strong acid, like hydrochloric acid, is mixed with a cyanide salt, like sodium cyanide. When these two substances react, they produce hydrogen cyanide gas, which is extremely toxic.
Substances that can undergo combustion to produce heat or energy are considered fuels. Common examples include gasoline, diesel, natural gas, coal, and wood.
When zinc reacts with acids to produce hydrogen gas, it is a chemical change because new substances are formed (zinc salts and hydrogen gas) with different properties from the original substances.
Mixing chlorine with citric acid can produce chlorine gas, which is toxic and can be harmful if inhaled. It is important to avoid combining these two substances to prevent the release of dangerous gases.
A synthesis reaction
No. Water and carbon dioxide are produced by combustion. Gas exchange does not produce anything. It is simply a matter or substances switching places.
Three substances that can generate electrical energy are coal, natural gas, and uranium. These substances can be used in power plants to produce electricity through various processes such as combustion or nuclear fission.