Q2 122024MPC

Cup A contains 1 gram of salt in 100mL of water and Cup B contains 5 grams of salt in 100mL of water. The salt in both cups is completely dissolved. Based on the data which of the following statements is correct?

• Solution A is a saturated solution.

• Solution A is more dilute than solution B.

• Solution A is more concentrated than solution B.

• Solution A and B have the same amount of solute.

Tags

NGSS.MS-PS1-2

Inez has two beakers that contain ethanol. One beaker (on the left) contains 150 mL of liquid. The other beaker (on the right) contains 250 mL of liquid. What can Inez expect to observe when she compares the properties of the liquid in the beakers?

• The mass of the liquid in each beaker is the same.

• The boiling point of the liquid in each beaker is the same.

• The solubility of salt will be lower in the beaker on the left.

• The boiling point of the liquid in the beaker on the right will be double.

Tags

NGSS.MS-PS1-2

Using the graph, how would you describe a solution of 260g of sugar at 50°C in 100g H₂O?

• Saturated

• Unsaturated

• Supersaturated

• Semi-saturated

Tags

NGSS.MS-PS1-4

Erin makes a sugar solution by adding a 1 teaspoon of sugar at a time to 100 mL of water until no more sugar dissolves. Then she makes a salt solution by adding 1 teaspoon of salt at a time to 100 mL of water until no more salt dissolves. She observes that she adds fewer teaspoons of salt before it stops dissolving. What does she conclude about the solubility of sugar and salt in water?

• They have no solubility.

• They have the same solubility.

• Salt has a higher solubility than sugar.

• Sugar has a higher solubility than salt.

Scientists previously thought that chemicals used as propellants in aerosol cans had no effect on the environment. Recently a pair of scientists hypothesized that these propellants could break down ozone in the atmosphere. How did scientists use logical reasoning to determine that the propellants might be harming the environment after all?

• The scientists created a computer model to trace the origins of the propellants in the atmosphere.

• The scientists identified possible reactions between the propellants and the materials the aerosol cans were made of.

• The scientists constructed graphs to compare the size of the ozone layer and the number of aerosol cans in stock at Walmart.

• The scientists collected data that showed that the hole in the ozone layer was growing larger and levels of the propellants in the atmosphere were increasing.

Tags

NGSS.MS-ESS3-4

NGSS.MS-PS1-3

Sara uses sodium chloride (NaCl) pellets to help keep her pool clean. Sara measured the solubility of sodium chloride (NaCl) in 100mL of water (H₂O) to be 30g/100mL at 20 °C. Sara needs to be able to dissolve additional NaCl in the water to make sure it stays clean. Based on what she knows about solubility, what could Sara do to increase the solubility of NaCl in her pool?

•  

  Add more salt and then vigorously stir the water with her skimmer.

• Turn on the pool heater to increase the temperature of the water. 

• Turn off the pool heater to decrease the temperature of the water.

• Add more water and then vigorously stir the water with her skimmer.

Tags

NGSS.MS-PS1-4

Beaker A and Beaker B contain pure water. Suppose 20 g of a solute is dissolved into both Beaker A and Beaker B. Which beaker would be considered more concentrated?

• Beaker A is more concentrated because it has less water.

• Beaker B is more concentrated because it has less water.

• Each beaker has an equal concentration because water was not added.

• Each beaker has an equal concentration because they are proportional.

Tags

NGSS.MS-PS1-2

Evie wanted to make soup for dinner. She added some salt, vegetables, and spices to some hot water to make her soup. The salt disappeared into the water, the vegetables sank to the bottom, and the spices floated on the top. Which of the following is the solute in this mixture?

• Salt

• Spices

• Vegetables

• Water

An environmental scientist was investigating a barrel of Acme Metals water labeled “clean water” that looked like clean water but it had a terrible smell.  He was concerned and tested a sample of the wastewater and found it to contain high levels a heavy metal that had been dissolved in the water. He wants to share his discovery with his colleagues. How could the scientist best describe the heavy metal in this scenario to his colleagues?

• The heavy metal is a solution and a contaminant in the water.

• The heavy metal is sediment and a contaminant in the water.

• The heavy metal is a solvent and a contaminant in the water.

• The heavy metal is a solute and a contaminant in the water.

Tags

NGSS.HS-PS1-2

Victoria used marbles to model the motion of atoms in a gas. 

Which of the following best describes how Victoria used the marbles in her model to show the behavior of atoms in a gas?

• The marbles vibrate slowly in the same place.

• The marbles are unable to move and are glued together.

• The marbles are fast-moving and far apart from each other.

• The marbles are slow-moving and able to move around each other.

Tags

NGSS.MS-PS3-5