Physical Science Midterm Review

FIRST NAME

LAST NAME

BLOCK

• 1st
• 2nd
• 3rd
• 4th

Which is the name for the following molecule?

A student wants to investigate the relationship between pressure and volume in nitrogen gas (N2) by using a pressure sensor on an airtight 25-milliliter (mL) syringe as shown in the diagram. In Step 1 of the investigation, the student will add Nitrogen to the syringe at 20°C. How should the student proceed with the investigation, and which graph shows what the student will MOST LIKELY observe?

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What is happening to the Acetic Acid between points X and Y on the graph?

• Liquid acetic acid is becoming warmer as it absorbs heat energy from the surroundings.
• Solid acetic acid is becoming warmer as it absorbs heat energy from the surroundings.
• Liquid acetic acid is being converted from a liquid to a gas by absorbing heat energy from the surroundings.
• Solid acetic acid is being converted from a solid to a liquid by absorbing heat energy from the surroundings.

A chemist dissolved 120.0grams of sodium nitrate (NaNO3) in 100 grams of boiling water. The solution was allowed to cool. According to the above solubility curve, at what temperature would you call the solution saturated?

• 18 C
• 65 C
• 55 C
• 88 C

Which portion of the graph represents the gas phase?

• A
• B
• C
• D
• E

A student plans to investigate how different factors affect the dissolving rate of a certain mass of Potassium Chloride (KCl) in water. The student will test a different variable in each investigation: the diameter of the crystals in millimeters (mm); the temperature of the solution in degrees Celsius (°C), and agitation (stirring) of the solution. The first table shows details and predictions of Investigation 1. Based on the predicted dissolving times for trials 1, 3, and 4, which statement contains the BEST prediction for the dissolving time in trial 2?

• 5 minutes, because the larger diameter of crystals increases the total surface area of the solute exposed to the solvent, decreasing the length of exposure to the solvent.
• 15 minutes, because the larger diameter of crystals increases the total surface area of the solute exposed to the solvent, increasing the length of exposure to the solvent
• 20 minutes, because the larger diameter of crystals decreases the total surface area of the solute exposed to the solvent, but the length of exposure to the solvent stays the same.
• 30 minutes, because the larger diameter of crystals decreases the total surface area of the solute exposed to the solvent, increasing the length of exposure to the solvent.

Which statement is true about the final atom created? (Select all that apply.)

• It has 2 more protons than the starting atom.
• It has 2 less electrons than the starting atom.
• Magnesium (Mg) has formed a +2 cation.
• Magnesium (Mg) has formed a -2 anion.