Unit 3 T1 - Pure Substance, Mixtures, and pH Scale

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. Examples include elements and compounds.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each retains its own properties. Examples include air, salad, and saltwater.

Front

How many different elements are there in a compound?

Back

2 or more

Front

What is the pH scale?

Back

The pH scale measures how acidic or basic a substance is, ranging from 0 (very acidic) to 14 (very basic), with 7 being neutral.

Front

Which has a pH below 7?

Back

Acid

Front

What is an acid?

Back

An acid is a substance that donates protons (H+) in a solution and has a pH less than 7.

Front

What is a base?

Back

A base is a substance that accepts protons (H+) or donates hydroxide ions (OH-) in a solution and has a pH greater than 7.

Front

What is the periodic table of elements?

Back

The periodic table of elements is a tabular arrangement of all known chemical elements, organized by increasing atomic number.

Front

What does it mean if a substance is neutral?

Back

A neutral substance has a pH of 7, meaning it is neither acidic nor basic.

Front

True or False: Mixtures DO NOT include substances.

Back

False