Classification of Matter Study guide 1.2-1.3

What is the difference b/w a homogenous mixture and a heterogenous mixture? Give two examples of each.

- A Homogenous mixture called a solution exhibits a uniform composition and appears visually the same throughout. Ex)sports drink, maple syrup - A heterogeneous mixture: A mixture with a composition that varies from point to point. Ex) Italian dressing, chocolate chip cookies

19. How are the molecules in oxygen gas, the molecules in hydrogen gas, and water molecules similar? How do they differ?

- A molecule consists of two or more combined atoms. They differ in that the type of atoms change from one substance to the next.

What is the difference b/w a pure substance and a mixture? Give two examples of each.

- A pure substance has a constant composition. - A mixture is composed of two or more types of matter that can be present in varying amounts and can be separated by physical changes. Ex) Pure substance: sugar, gold Ex) mixture: Evaporation

What is the difference b/w a physical property and a chemical property? Give at least two examples of each.

- Physical property: characteristic of matter that is not associated with a change in its chemical composition. Ex) Density, color Chemical property: The change of one type of matter into another type ( or the inability to change ) Ex) Acidity, toxicity

What is the difference b/w an element and a compound?

- Pure substances that cannot be broken down into simpler substances by chemical changes are called ELEMENTS. - Pure substances that can be broken down by chemical changes are called COMPOUNDS.

17) Classify each of the following as an element , a compound, or a mixture. A)Iron B) oxygen C)mercury oxide D) Pancake syrup E) Carbon dioxide F) A substance composed of molecules each of which contains one hydrogen atom and one chlorine atom G) Baking soda H) Baking powder

A) Iron: Element B) Oxygen: Element C) Mercury Oxide: Compound D) Pancake syrup: Mixture E) Carbon Dioxide: Compound F) A substance composed of molecules of which contains one hydrogen atom and one chlorine atom: Compound G) Baking soda: compound H) Baking powder: Mixture

27) classify each of the following changes as physical or chemical: A) condensation of steam B) burning of gasoline C) souring of milk D) Dissolving of sugar in water E) melting of gold

A) Physical B) Chemical C) Chemical D) Physical E) Physical

29. The volume of a sample of oxygen gas changed from 10 mL to 11 mL as the temperature changed. Is this a chemical or physical change?

Physical change

Liquids assume the shape of their______________.

container

In solid matter, atoms or molecules are in ____________ locations.

fixed

A solid has a __________ volume and a __________ shape.

fixed, fixed

In liquid matter, atoms or molecules are free to move relative to each other giving liquids a ______________ volume but not a ____________ shape.

fixed, no fixed shape

Gases always assume the _________ and the __________ of their container.

shape and the volume

It can exist in three different states _________, __________ and __________

solids, liquids, and gases

In gaseous matter, atoms or molecules have ____________ b/w them and are free to move relative to one another.

a lot of space

Matter is defined as

anything that occupies space, and has mass and it is all around us.