science

WHAT IS AN ELEMENT?

• AN ELEMENT IS A ELEMENTAL SUBSTANCE THAT CANNOT BE BROKEN DOWN INTO OTHER SUBSTANCES BY CHEMICAL REACTIONS ( MADE OF ONE KIND OF ATOM)

• AN ELEMENT IS A CHEMICAL SUBSTANCE THAT CANNOT BE BROKEN DOWN INTO OTHER SUBSTANCES BY CHEMICAL REACTIONS ( MADE OF ONE KIND OF ATOM)

• AN ELEMENT IS A CHEMICAL SUBSTANCE THAT CAN BE BROKEN DOWN INTO OTHER SUBSTANCES BY CHEMICAL REACTIONS ( MADE OF ONE KIND OF ATOM)

• AN ELEMENT IS A CHEMICAL SUBSTANCE THAT CANNOT BE BROKEN DOWN INTO OTHER SUBSTANCES BY CHEMICAL REACTIONS ( MADE OF MANY KINDS OF ATOMS)

WHAT IS THE CONSERVATION OF MASS?

• • THE MASS OF ALL SUBSTANCES PRESENT BEFORE A CHEMICAL CHANGE EQUALS THE MASS OF THE SUBSTANCES AFTER THE PHYSICAL CHANGE

• • THE MASS OF ALL SUBSTANCES PRESENT BEFORE A CHEMICAL CHANGE EQUALS THE MASS OF THE SUBSTANCES AFTER THE CHEMICAL CHANGE

• • THE MASS OF ALL SUBSTANCES PRESENT AFTER A CHEMICAL CHANGE EQUALS THE MASS OF THE SUBSTANCES AFTER THE CHEMICAL CHANGE

• • THE MASS OF ALL SUBSTANCES PRESENT BEFORE A CHEMICAL CHANGE DOES NOT EQUAL THE MASS OF THE SUBSTANCES AFTER THE CHEMICAL CHANGE

DIFFERENT TECHNIQUES CAN BE USED TO

SEPERATE SUBSTANCES. MORE THAN ONE ANSWER!

• • MAGNATISM

• CENTRIFUGATION

• FILTERATION

• DISTILLATION

• CHROMATOGRAPHY

WHAT IS A HETEROGENEOUS MIXTURE?

• A HETEROGENEOUS A MIXTURE IN WHICH THE COMPOSITION IS ONLY UNIFORM THROUGHOUT THE FORM

• A HETEROGENEOUS A MIXTURE IN WHICH THE COMPOSITION IS NOT UNIFORM THROUGHOUT THE FORM

• A HETEROGENEOUS A MIXTURE IN WHICH THE COMPOSITION IS UNIFORM THROUGHOUT THE MIXTURE

• A HETEROGENEOUS A MIXTURE IN WHICH THE COMPOSITION IS NOT UNIFORM THROUGHOUT THE MIXTURE

• MATTER THAT IS EITHER AN ELEMENT OR A COMPOUND WITH A FIXED CHEMICAL COMPOSITION

• TRUE

• FALSE

• A HOMOGENEOUS MIXTURE IS A MIXTURE IN WHICH THE COMPOSITION IS UNIFORM THROUGHOUT THE MIXTURE

• TRUE

• FALSE

ELEMENTS AND COMPOUNDS CAN NOT BE REDUCED TO MORE BASIC COMPONENTS BY PHYSICAL MEANS

• FALSE

• TRUE

• PHYSICAL PROPERTIES CAN BE USED TO SEPARATE MIXTURES

• FALSE

• TRUE

MIXTURES ALWAYS CONTAIN THE SAME AMOUNTS OF SUBSTANCES THAT MAKE THEM UP

• FALSE

• TRUE

THE IDENTITY REMAINS THE SAME

• IRON

• MUD