chemistry quiz 1.4

a students fills a flask with 5.0 moles of nitrogen gas and then seals the flask. Which change will happen when the student warms the flask?

• the temp of the nitrogen gas will decrease

• the pressure inside the flask will increase

• the volume inside the flask will decrease

• the molar mass of the nitrogen gas will increase

a sample of iron has a volume of a 10 mL. The density of iron is 7.87g/mL. which is the correct expression to calculate the mass of the sample using dimensional analysis?

• 10.0 ml x (7.87 g/ 1 ml)

• dah asieasdjogaioj

• dfajovaimmoam

• 10.0 mL x (7.87 mL / 1 g

what is the density of an object having a mass of 8.0 g and volume of 25 mL?

• 0.32 g / mL

• aeoai

• oijeriojae vno

• 3.1 g / mL

which region of the graph represents the solid phase?

• A-B

• B-C

• C-D

• D-F

which of the following statements explains why elements of the alkali metal family are highly reactive

• Alkali metals are easily ionized

• because

• i said so

• alkali metals are negatively charged

which if the following observed properties is most reliable in classifying a substance as a metal?

• a good conductor of heat

• low melting temp

• unreactive with other elements

• crummles when hit by hammer

mass spetrometers seperate isotopes of different elements based on their:

• booty

• mass divided by electric charge

• savage

• 99

which of the following is NOT a property of salt?

• booty

• everything

• they have a low melting point but high boiling point

• they are brittle

how many significant figures are in 0.00003300?

• 4

• 5

• 8

• 9

how many significant figures are in 1.03338000?

• 8

• 9

• 50000000

• 67