Chemical Reactions and Properties (REACTION OF METALS WITH WATER

What happens in a chemical reaction?

• The substance stays the same

• A new substance is formed

• It only changes shape

• The substance disappears

Which of these is a sign of a chemical reaction?

• Change in size

• Formation of gas or bubbles

• Freezing of water

• Breaking into pieces

What do we call the substances that react in a chemical reaction?

• Reactants

• Products

• Elements

• Metals

Rusting is an example of a chemical reaction. What do iron and oxygen form when they react?

• Silver

• Water

• Rust

• Sand

What type of reaction happens when a candle burns?

• Physical change

• Melting reaction

• Chemical reaction

• Freezing reaction

What does the periodic table show?

• A list of all known elements

• All types of mixtures

• A collection of metals only

• A group of chemicals for experiments

Which element is known as the lightest?

• Oxygen

• Carbon

• Hydrogen

• Iron

Which of these is a metal?

• Oxygen

• Iron

• Helium

• Neon

What is the symbol for oxygen?

• Ox

• O2

• O

• Oy

Which of the following is NOT an element?

• Water

• Gold

• Silver

• Copper