Structure and properties of materials

Question 1

What is the appearance of elements and compounds?

Answer 1

uniform

Question 2

What is the appearance of mixture?

Answer 2

non-uniform

Question 3

What is the composition of elements and compuonds?

Answer 3

fixed

Question 4

What is the composition of mixture?

Answer 4

not fixed

Question 5

Does element and compound have a symbol/formula?

Answer 5

yes

Question 6

Does mixture have a symbol/formula?

Answer 6

no

Question 7

Is element found in periodic table?

Answer 7

yes

Question 8

Is compound and mixture found in periodic table?

Answer 8

no

Question 9

What are the properties of elements?

Answer 9

-Fixed boiling point and melting point
-cannot be separated by physical means
-single spot in chromatogram

Question 10

What are the properties of compound?

Answer 10

-fixed boiling and melting point
-cannot be separated by physical means
-single spot in chromatogram

Question 11

What are the properties of mixture?

Answer 11

-no fixed boiling and melting point
-can be separated by physical means
-more than 1 spot in the chromatogram

Question 12

What is the physical properties of metal?

Answer 12

Shiny, good electrical and heat conductor, ductile and malleable, high melting and boiling point, high density

Question 13

What is an alloy?

Answer 13

Alloy is a mixture of metal with another element

Question 14

Why is alloy stronger than pure metal?

Answer 14

Alloy is stronger and harder than pure metal because the different sizes atoms disrupt the orderly arrangement of the metal atoms, making layers of atoms difficult to slide over one another