Unit 8 & 9 Chemistry

Colas are slightly acidic. If the [H+] in a solution is 1.0 X 10^-5 M, is the solution acidic, basic, or neutral . What is the [OH-] of the solution?

• 1 X 10^-9 M

• 2 X 10^-9 M

• 1 X 10^-9 M

• 3 X 10^-9 M

What is the equation for the Heat of Fusion?

• Q=mHf

• Q=mHv

What is the equation for Heat of Vaporization

• Q=mHv

• Q=mHf

Tags

NGSS.HS-PS3-4

From the reaction: B₂H₆ + O₂ HBO₂ + H₂O

a. What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

• 120g O2

• 125g H6

• 125g O2

• 120g H6

Write the balanced chemical equations of each reaction:

a. Calcium carbide (CaC₂) reacts with water to form calcium hydroxide (Ca(OH)₂) and acetylene gas (C₂H₂).

• CaC₂ + 2 H₂O C₂H₂ + Ca(OH)₂

• Cac2 + 2 H2O -> C4H3 + CaOH

Balance the following equation

CO + O₂ CO₂

• 2CO + O₂ -> CO₂

• 2CO + O₂ -> 2CO₂

• 2CO + O₂ -> 2CO₂

• 2CO + 2O₂ ->CO₂

Tags

NGSS.MS-PS1-5

495 cm3 of oxygen gas and

877 cm3 of nitrogen gas, both at 25.0 °C and 114.7 kPa, are injected into an evacuated

536 cm3 flask. Find the total pressure in the flask, assuming the temperature remains constant.

• 234kpa

• 294kpa

• 394kpa

• 324kpa

A bubble of helium gas has a volume of 0.650 mL near the bottom of a large aquarium where the pressure is 1.54 atm and the temperature is 12°C. Determine the bubble’s volume upon rising near the top where the pressure is 1.01 atm and 16°C.

• 3.90mL

• 2.00mL

• 1.00mL

• 4.00mL