LOCOM, Elements, and The Periodic Table Practice

Front

What is this element's atomic number?

Back

12

Front

According to the law of conservation of matter, which statement about chemical reactions is true?

Back

Atoms cannot be created or destroyed by chemical reactions.

Front

Samantha's chemical reaction: 15g baking soda + 10g acetic acid. Mass of products after reaction: 23g. How much gas was not collected?

Back

2g

Front

What is true about a closed system during a chemical reaction?

Back

The total mass in the system stays the same.

Front

Identify the chemical equation that follows the Law of the Conservation of Matter: 2C₂H₆ + 6O₂ → 2CO₂ + 6H₂O , H₂ + Cl₂ → 2HCl , C₂H₆ + O₂ → 2CO₂ + 2H₂O, N₂ + 3H₂ → NH₃

Back

H₂ + Cl₂ → 2HCl

Front

How many oxygen (O₂) molecules are produced from the splitting of two molecules of water (H₂O) according to the balanced equation: 2H₂O →2H₂ + O₂?

Back

1

Front

Pure sodium metal explodes when it makes contact with water. In its natural state, chlorine is a deadly, poisonous gas. When these two chemicals combine, they form sodium chloride or table salt. Which statement does this information support?

Back

When substances are chemically combined, the properties of the newly formed substances are often different from the properties of the original substances.

Front

All matter is made up of tiny particles called

Back

atoms

Front

An element is

Back

a substance made of just one kind of atom that cannot be broken down into something simpler

Front

The part of an atom that contains the protons and neutrons is the

Back

nucleus