) Before volume of liquid 'H' was measured, the pupils made sure that the measuring cylinder was clean and dry. State one reason for this
precaution
[1]
Total = 6 marks​

What is the density of the black hole

How did planetesmals form planets? a. they broke apart into smaller chunks.b. they collided and stuck together.c. they cooled and pulled ice together.d. they began to rotate.

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.