December Chemistry Flash Cards

Question 1

What is a Compound?

Answer 1

A pure substance whose smallest unit is made up of atoms of MORE than one type of element.

Question 2

What is Heterogeneous Mixture?

Answer 2

TWO or more substances that are together but do NOT combine chemically to form a new, pure substance.
A mixture with VISIBLE components and does not look the same throughout.

Question 3

What is Homogeneous Mixture?

Answer 3

A mixture that appears the same throughout

Question 4

Is sugar a compound or an element?

Answer 4

Compound

Question 5

Is Chili Heterogeneous mixture or Homogeneous mixture?

Answer 5

Heterogeneous

Question 6

Is Mild a Heterogeneous or Homogeneous mixture?

Answer 6

Homogeneous

Question 7

During a phase change, the temperature of a substance ________.

Answer 7

Varies

Question 8

What is Volume?

Answer 8

Anything that takes up space and has mass.

Question 9

What is Plasma?

Answer 9

The 4th State of Matter

It is NOT common on Earth

Question 10

What is Solid?

Answer 10

Definite shape and volume, particles are packed very closely.

Question 11

What is Liquid?

Answer 11

Matter with a definite volume but o definite shape.

Question 12

What is Surface Tension?

Answer 12

Uneven forces acting on the particles of a liquids surface.

Question 13

What is Chemical Reaction?

Answer 13

The processes where substances change into different substances through the breaking of chemical bonds.

Question 14

What is the difference between REACTANTS and PRODUCTS in a CHEMICAL REACTION

Answer 14

Question 15

4 types of evidence a chemical reaction has taken place.

Answer 15

Gas Bubble
Color Change
Precipitation
Energy Released or Used Up

Question 16

What are the 4 Main Types of Chemical Reactions?

Answer 16

Synthesis
Decomposition
Single Replacement
Double Replacement

Question 17

What is a Synthesis chemical reaction

Answer 17

Occurs when two elements combine to form a compound.

Question 18

What is a Decomposition chemical reaction?

Answer 18

A single compound breaks down into two or more elements/compounds.

Question 19

What is a Combustion chemical reaction?

Answer 19

A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat. Combustion reactions must involve O2 as one reactant. (Think marshmallow burning on a stick.)

Question 20

What is a Catalyst?

Answer 20

A substance that helps a chemical reaction happen faster. (Think putting gasoline on a fire.)

Question 21

How does temperature affect the rate of a reaction taking place?

Answer 21

It increases the reaction taking place.

Question 22

What is Chemical Property?

Answer 22

Original material is transformed into a new material with new properties.

A chemical reaction occurs and new products occur.

Exp: Burning wood, rotting banana, fireworks.

Question 23

What is Physical Change?

Answer 23

Any change in size, shape or form of matter without changing the identity of substance.
DOES NOT FORM A NEW SUBSTANCE
Exp: Ice cream melting, cutting apple, stretching rubber band.

Question 24

What is Exothermic?

Answer 24

Energy is released in a reaction and it becomes warmer.

Question 25

What is Physical Property?

Answer 25

Characteristics that can be OBSERVED through senses, such as color and texture, shape, size, mass. volume, density, odor/smell, texture, etc.

Question 26

Wax melting is an example of...?

Answer 26

Physical change

Question 27

Rusting of metal is an example of...?

Answer 27

Chemical change

Question 28

What is Chemical Change?

Answer 28

One or more substances are changed into new substances that HAVE NEW AND DIFFERENT PROPERTIES. The change is difficult or impossible to reverse. Exp: New color appears, bubbles of gas are formed, solid material (precipitates) forms into a liquid.