Unit 1 exam

Question 1

How to figure out the amount of neutrons?

Answer 1

Atomic mass - (no. protons/electrons)

Question 2

Calculating the number of moles formula :

Answer 2

n = m/M

Question 3

What do the letters mean in the calculating the number of molecules formula?

Answer 3

n = number of moles (mol)
m = mass (grams)
M= molar mass (g/mol)

Question 4

What’s another formula for calculating the number of moles?

Answer 4

n= (no. of particles)/N(small a)

Question 5

What does N(little a) stand for?

Answer 5

6.02 x 10^23

Question 6

define allotrope

Question 7

define ionic bond

Question 8

define covalent bond

Question 9

why are alloys poorer conductors of electricity when compared to the pure metals used in the alloy

Question 10

why do pure metals in an alloy have a higher melting point rather than the metals used to produce the alloy