Chemical Reactions Flashcard

Front

What is a chemical reaction?

Back

A process where substances (reactants) are transformed into new substances (products) through the breaking and forming of chemical bonds.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; the total mass of reactants equals the total mass of products.

Front

What is an exothermic reaction?

Back

A chemical reaction that releases heat, resulting in an increase in temperature of the surroundings.

Front

What is an endothermic reaction?

Back

A chemical reaction that absorbs heat, resulting in a decrease in temperature of the surroundings.

Front

What is a reactant?

Back

A substance that undergoes a chemical change in a reaction.

Front

What is a product?

Back

A substance that is formed as a result of a chemical reaction.

Front

What is an indicator of a chemical reaction?

Back

Signs such as color change, temperature change, gas production, or precipitate formation.

Front

What is magnesium powder used for in flameless heaters?

Back

It serves as a reactant that produces heat when it reacts with water.

Front

What safety precautions should be taken when handling magnesium powder?

Back

Avoid inhalation and contact with skin, and keep it away from open flames due to its flammability.

Front

What is iron powder's role in hand warmers?

Back

It acts as a reactant that oxidizes to produce heat.