An increase in the temperature of a contained liquid__
a)has no effect on the kinetic energy of the liquid
b)causes the vapor pressure above the liquid to decrease
c)causes fewer particles to escape from the surface of the liquid
d)causes the vapor pressure above the liquid to increase

water could be made to boil at 105c° instead of 100c° by __
a) adding a lot of energy to the water
b) increasing the external pressure
c) decreasing the external pressure
d) taking the sample to a higher altitude

how do crystal systems differ?
a) in the angles between faces only
b) in the number of edges of equal length only
c) in the angles between bases in the number of edges of equal links
d) crystal systems do not differ

lesson 14 unit test unit 1: solids, liquids and gases

An increase in the temperature of a contained liquid__

D)Causes the vapor pressure above the liquid to increase

Water could be made to boil at 105C° instead of 100C° by __

B) increasing the external pressure

How do crystal systems differ?

C) in angles between bases in the number of edges of equal links

Hope this answers your question!

Explanation:   An increase in the temperature of a contained liquid- will  D)Causes the vapor pressure above the liquid to increase

Because when the temperature in increased , it will increase the kinetic energy of the molecules and would not cause the vapor pressure above the liquid to decrease. And when temperature increases, this will cause more particles to escape from the surface of the liquid.

Water could be made to boil at 105C° instead of 100C° by -  B) increasing the external pressure

As decreasing the external pressure and taking the sample to a higher altitude wont affect the boiling rates of water.

How do crystal systems differ? - C) in the angles between bases in the number of edges of equal links

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles

the answer is b & c i believe : )