s8P1f LOCOM and Counting Atoms

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen (H), oxygen (O), and carbon (C).

Front

How many elements are in the compound H2COCH2?

Back

There are 3 different elements: Hydrogen (H), Carbon (C), and Oxygen (O).

Front

What does the subscript in a chemical formula represent?

Back

The subscript indicates the number of atoms of the element in the molecule. For example, in H2O, the '2' means there are 2 hydrogen atoms.

Front

What is the total number of atoms in H2SO4?

Back

There are 7 total atoms: 2 Hydrogen (H), 1 Sulfur (S), and 4 Oxygen (O).

Front

How many Magnesium atoms are in 10MgCl2?

Back

There are 10 Magnesium atoms.

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. The total number of atoms remains the same before and after the reaction.

Front

Why is it important to count atoms in a chemical reaction?

Back

Counting atoms helps us understand how substances react and ensures that the reaction follows the Law of Conservation of Mass.

Front

What does it mean if a chemical equation is balanced?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, showing that mass is conserved.

Front

What is a chemical reaction?

Back

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

Front

What is a reactant?

Back

A reactant is a substance that undergoes change in a chemical reaction. For example, in the reaction of hydrogen and oxygen to form water, both hydrogen and oxygen are reactants.