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Chemical Reactions
This stack of flash cards was made by 8th grade science students, and is designed for 4th graders to study and understand the many concepts introduced.
14
Chemistry
4th Grade
02/29/2012

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Cards

Term
What is a solution?
Definition
A solution is a mixture of one substance dissolved in another so the properties are the same throughought.
Term
What is the difference between a heterogeneous and a homogeneous mixture?
Definition

A heterogenous mixture is a mixture with substances that dont blend together well like raisins and water

 

A homogenous mixture is a mixture were the two parts blend together well like suger and water

Term
What are the different parts of a solution?
Definition

Solute -- dissolves into a solvent to form a solution (i.e. salt in salt water) 

Solvent -- what the solute dissolves into to form a solution (i.e. water in salt water)

Term
Were can solutions be found?
Definition

solutions can be found every where two substances are mixed together.

some common solutions are sugar water, salt water, and [image]tea 

Term
What is a base?
Definition

Bases can be thought of as the chemical opposite of acids.

Term
What is an acid?
Definition
 
A chemical substance that neutralizes alkalis, breaks down some metals, has a sour taste, and turns litmus red.
Term
What is salt?
Definition
In chemistry, salts are ionic compounds that result from the neutralization reaction of an acid and a base.
Term
What is a neutralization reaction?
Definition
Neutralization reaction -- when a base and an acid is bonded together to form a salt.
Term
How can you tell when a chemical reaction takes place?
Definition

1) Combustion

2) Synthesis

3) Decomposition

4) Single displacement

5) Double displacement

and....

6) Acid-base

Term
What are the four signs of a chemical reaction?
Definition

color change

making of gas bubbles

a wet coating on the outside

tempature change

Term
What are parts of a chemical equation?
Definition
There are 4 parts to a chemical equation. They are the reactant(s), yield sign, product(s), and the coeffiecients. The reactant(s) come before the yield sign, and make the product(s), which come after the yield sign. The yield sign is in between the reactant(s), and the product(s). It look like an arrow pointing to the product(s) (-->). What the yield sign is saying is that the reactant(s), when combined or dissolved, form the product(s).
Term
How is energy exchanged in a chemical reaction?
Definition
by making chemical bonds
Term
What is a ionic bond?
Definition
 A chemical link between two atoms caused by the electrostatic bonds between oppositely-charged ions in an ionic compounds.

Term
What is a covalent bond?
Definition
 A covalent bond is a chemical link between two atoms in which electrons are shared between them.

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