Chemical reactions

Provided on what I know so far

What is a physical change?

When no new substance has been formed

What are examples of a physical change?

When the substance changes shape (rubber band stretching), breaks into smaller pieces (breaking glass), dissolves (sugar dissolving in tea), is mixed with another substance (mixing colourful drinks), changes state (ice melting).

What is a chemical change?

When a new substance has been formed. This means that a chemical reaction has occurred.

What are some examples of a chemical change?

Baking a cake, burning things, dead animals or fruit rotting, fruit ripening.

What are the signs of a chemical change?

Permanent colour change, Gas production, precipitate formation, metal discplacement, temperature change, exothermic reactions, endorthermic reactions.

What is a precipitate reaction?

When two solutions mix, and a solid substance is formed.

What are the forms of a temperate change?

Exothermic reactions and endothermic reactions.

What is an exothermic reaction?

Produces energy (gets hotter or brighter). Reactants have more energy than the products.

What is an endothermic reaction?

Absorbs energy (gets colder). The products have more energy than the reactants.

What are ionic bonds?

a type of chemical bond involving electrostatic attraction.

What is electrostatic attraction?

The attractive force between ions with opposite electric charge.

What does a chemical equation look like

Reactant + Reactant → Product

Order the steps of a discussion 1-5

The findings, the data to support the findings, the science behind the findings, the validity of the experiment and improvements