Solution Chemistry and Phase Changes

A sample of iron receives 50.J of heat energy that raises the temperature of the iron by 25.0°C. If iron has a specific heat of 0.10 J/g°C, what is the mass of the iron sample?  (show your work)

• 25g
• 30g
• 20g
• 50g

Tags

NGSS.HS-PS3-1

The specific heat of water is 4.18 J/g°C.

If 980. J of energy is added to 6.20 g of water at 18.0 °C, what is the final temperature of the water?

• 37.8 °C

• -19.8 °C

• 19.8 °C

• 55.8 °C

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

Which line segment demonstrates vaporization occurring?

• B-C
• C-D
• D-E
• E-F

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

water have a low vapor pressure because

• it has strong london dispersion forces acting between its molecules
• it has strong hydrogen bonds acting between its molecules
• it has a weaker force of attraction between its molecules
• it is very volatile

Tags

NGSS.HS-PS1-3

The lower the boiling point, the ___ the intermolecular forces.

• stronger
• weaker

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

why does a gas with a lower vapor pressure have a higher boiling point

• its molecules need more energy in order to break free from strong attraction
• there are strong forces of attraction between its particles
• it has a lower volatility
• all of the answer

Which combination will produce a precipitate?

• NaCl (aq) and HC₂H₃O₂ (aq)
• NaOH (aq) and Fe(NO₃)₂ (aq)
• AgNO₃ (aq) and Ca(C₂H₃O₂)₂ (aq)
• NH₄OH (aq) and HCl (aq)

Tags

NGSS.HS-PS1-5

When aqueous solutions of AgNO₃ and NaI are mixed, AgI precipitates. The balanced net ionic equation is

• Ag⁺ (aq) + NO₃^- (aq)   >  AgNO₃ (aq)
• AgNO₃ (aq) + NaI (aq)   >   AgI (s) + NaNO₃ (aq)
• Ag⁺ (aq) + I^- (aq)   >    AgI (s)
• Ag⁺ (aq) + NO₃^- (aq) > AgNO₃ (s)

How many grams of H₃PO₄ are in 175 mL of a 3.5 M solution of H₃PO₄?

• 60
• 4.9
• 612
• 20

How many moles of BaCl₂ are formed in the neutralization of 393 mL of 0.171 M Ba(OH)₂ with aqueous HCl?

• 1.15
• 0.0672
• 0.0336
• 2.30

Tags

NGSS.HS-PS1-7