science year 8 tem 1

Question 1

what are characteristics of a solid

Answer 1

fixed shape
fixed volume
rigid

Question 2

what are the characteristics of a liquid

Answer 2

fixed volume
not rigid
no fixed shape

Question 3

what are the characteristics of a gas

Answer 3

no fixed shape
not rigid
no fixed volume

Question 4

definition of an element

Answer 4

single element

eg: H

Question 5

definition of a compound

Answer 5

more than one element
eg: H2O

Question 6

how to get a proton

Answer 6

proton- atomic number (top number)

Question 7

how to get electron

Answer 7

electron- atomic number (top number)

Question 8

how to get neutron

Answer 8

neutron- atomic mass - atomic number (bottom number take top number)

Question 9

definition of a physical change

Answer 9

no new substance

can change back to original form

eg: ice melting

Question 10

definition of a chemical change

Answer 10

new substance

can’t change back to original form

eg: baking a cake