assessment 1

Question 1

what is the formula for efficiency?

Answer 1

actual yield/theoretical yield x 100

Question 2

what is the formula for concentration?

Answer 2

mass of solute/volume of solvent

Question 3

what is formula for density?

Answer 3

mass/volume

Question 4

properties of a physical change:

Answer 4

reversible

changes in state

Question 5

properties of a chemical change:

Answer 5

particles reacting and rearranging

Question 6

what is diffusion?

Answer 6

it is the movement of molecules from an area of high concentration to an area of lower concentration. when it is equally spread out, it is at the point of equilibrium

Question 7

what is the difference of concentration known as?

Answer 7

concentration gradient

Question 8

what is pressure?

Answer 8

pressure is when something is heated up (it gets more kinetic energy) and needs more space but doesnt have enough so it tends to explode

Question 9

what is concentration?

Answer 9

it is a measure of the number of solute particles in a given volume of solvent

Question 10

what is expansion?

Answer 10

when heat causes solids, liquids and gases to expand and take up more room. the particles DO NOT change sizes

Question 11

properties of a solid:

Answer 11

metals are conductive
durable
ductile
cant change form
cant put hand through most
malleable
least amount of energy