PS-1

Select phrases from the lists to complete these sentences. The best two input variables to use for the simulation are the number of $5 filters and the number of $1 filters. The output obtained from running the simulation would include the percentage of the contaminant that remains in the sample and the number of $1 filters.

Balance the chemical equation shown using the menus. Lead(II) nitrate (Pb(NO₃)₂) combines with potassium iodide (KI) to form solid lead(II) iodide (PbI₂) and aqueous potassium nitrate (KNO₃).

Students are planning to investigate the relationship between intermolecular forces in compounds and their boiling points. If the students want to investigate compounds with significant differences in their intermolecular forces, which pair of compounds would be best to investigate?

• CO₂ and Cl₂

• H₂O and CH₄

• H₂O and H₂O₂

• CH₄ and CH₃CH₃

Tags

NGSS.HS-PS3-2

A group of students designs and tests four systems meant to reduce heat lost from hot water that is at 90°C. Four beakers are wrapped with different materials. The fifth beaker is not wrapped. The temperature of the water in each beaker is monitored over a period of time. The table lists the time intervals and wrap materials. Which explains the behavior of a wrap material correctly?

• The thick paper-based material is dense and quickly conducts heat from the water to the cooler surroundings.

• The black cloth absorbs heat from the hot water and transfers it back to the water.

• Aluminum foil reflects the heat away from the water to the cooler surroundings.

• Polymer foam insulation contains many air pockets that reduce the transfer of heat from the water to the cooler surroundings.

Tags

NGSS.HS-PS3-4

Nuclear reactions in stars generate particles such as positrons and neutrinos. The following model shows two of these reactions. Select one check box in each row that best identifies processes X and Y from the model.

• Fusion

• Radiation released

Tags

NGSS.HS-ESS1-1

NGSS.HS-PS1-8

Which question should be asked to best help the board make its decision?

• Would storing a digital document require more than 50 kilobytes of memory?

• Would paper-based documents become obsolete after digital documents are created?

• Could users consider reading a paper-based document more enjoyable than reading a digital document?

• Can creating a digital document help minimize the loss of the information contained in the paper-based document that occurs over time?

Tags

NGSS.HS-PS4-2

Could scanning the document result in the of the paper when from the scanner comes into contact with the paper?

Which two materials will yield the best evidence of thermal energy transfer within the closed system?

• 25 grams of 0°C ice

• 50 grams of 20°C water

• 25 grams of 50°C iron (Fe)

• 50 grams of 20°C iron (Fe)

Tags

NGSS.HS-PS3-4

Valence electron dot structures are shown for some of the elements in the second row of the periodic table. Which two descriptions of a chemical reaction include a correct formula for the compound formed in a reaction?

• Lithium reacts with fluorine to produce lithium fluoride (LiF).

• Lithium reacts with oxygen to produce lithium oxide (Li₂O).

• Beryllium reacts with fluorine to produce beryllium fluoride (BeF).

• Beryllium reacts with oxygen to produce beryllium oxide (BeO).

• Boron reacts with fluorine to produce boron fluoride (BF₃).

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Based on the data, what effect does the concentration of nitrogen monoxide have on the rate of the reaction? Use the menus to complete the statement correctly. The rate of the initial reaction increases as the concentration of nitrogen monoxide [dropdown options: increases; decreases; remains constant]. This can be explained by the [dropdown options: increase; decrease] in the [dropdown options: energy of the collisions; frequency of the collisions] between reacting molecules.

Tags

NGSS.HS-PS1-5