7R FLASHCARD- on Law of Conservation of Mass/chemical reactions

Front

What does the Law of Conservation of Mass state?

Back

The Law of Conservation of Mass states that in a closed system, mass is neither created nor destroyed during a chemical reaction; it is conserved.

Front

What happens to the atoms in wood and oxygen when they are burned?

Back

The atoms in the wood and oxygen rearrange to form new substances, such as smoke and ash.

Front

In a chemical reaction, what are the substances called that are formed as a result?

Back

The substances formed as a result of a chemical reaction are called products.

Front

If reactant A has 5g and reactant B has 9g, what is the total mass of product C in the reaction A + B --> C?

Back

The total mass of product C should be 14g, as mass is conserved.

Front

How many Hydrogen (H) atoms are in the compound 4NH3?

Back

There are 12 Hydrogen (H) atoms in 4NH3.

Front

How many Phosphorus (P) atoms are in the compound 4PCl3?

Back

There are 4 Phosphorus (P) atoms in 4PCl3.

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction.

Front

What is the difference between reactants and products in a chemical reaction?

Back

Reactants are the starting substances that undergo change, while products are the substances formed as a result of the reaction.

Front

What is the significance of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the Law of Conservation of Mass is upheld, meaning the number of atoms for each element is the same on both sides of the equation.

Front

What is a chemical reaction?

Back

A chemical reaction is a process in which substances (reactants) are transformed into different substances (products) through the breaking and forming of chemical bonds.