New Jersey NJSLA Science Grade 11 Practice Questions - New Jersey Student Learning Assessments - Science Grade 11 Exam - New Jersey NJSLA Science Grade 11 Practice Questions - New Jersey Student Learning Assessments

Question 1

A student compares the first ionization energies of sodium (Na) and magnesium (Mg), both in period 3. Magnesium has a higher first ionization energy than sodium. Which statement best explains this trend across the period?

As protons are added across a period, the nuclear charge increases while valence electrons stay in the same principal energy level, so they are held more tightly. Valence electrons move into a higher principal energy level as you move left to right, placing them farther from the nucleus. The number of occupied electron shells decreases from sodium to magnesium, so electrons are closer to the nucleus. Electronegativity decreases from sodium to magnesium, weakening the attraction between the nucleus and valence electrons.

Correct Answer:

As protons are added across a period, the nuclear charge increases while valence electrons stay in the same principal energy level, so they are held more tightly.

Question 2

A laboratory procedure calls for 0.250 mol of sodium chloride. Using Avogadro's number, 6.02 × 10^23 particles per mole, how many formula units of NaCl should be measured?

1.51 × 10^23 formula units 6.02 × 10^23 formula units 3.01 × 10^23 formula units 1.50 × 10^24 formula units

Correct Answer:

1.51 × 10^23 formula units

Question 3

Methane burns in oxygen by the reaction CH4 + 2 O2 → CO2 + 2 H2O. When 4 molecules of CH4 react with 6 molecules of O2, which reactant limits the amount of CO2 produced, and how many CO2 molecules form?

Oxygen is limiting; 3 molecules of CO2 form. Methane is limiting; 4 molecules of CO2 form. Oxygen is limiting; 6 molecules of CO2 form. Both are consumed completely; 5 molecules of CO2 form.

Correct Answer:

Oxygen is limiting; 3 molecules of CO2 form.

Question 4

A chemist compares two reactions. Reaction A releases 340 kJ per mole of product and Reaction B absorbs 340 kJ per mole. Which statement correctly relates bond breaking and bond forming to the energy change?

In Reaction A the bonds formed release more energy than is required to break bonds in the reactants; in Reaction B the bonds broken require more energy than the bonds formed release. Both reactions release energy because bonds are always formed during a chemical change. In Reaction B the bonds formed release more energy than the bonds broken require, making the change exothermic. The energy change depends only on the number of atoms, not on the bond energies of reactants and products.

Correct Answer:

In Reaction A the bonds formed release more energy than is required to break bonds in the reactants; in Reaction B the bonds broken require more energy than the bonds formed release.

Question 5

A power plant uses uranium-235 in a reactor. A U-235 nucleus absorbs a neutron and splits into two smaller nuclei, releasing several neutrons and a large amount of energy. Which process is occurring, and what allows the reaction to sustain itself?

Nuclear fission; the neutrons released can split additional U-235 nuclei, forming a chain reaction that is controlled by neutron-absorbing rods. Nuclear fusion; the neutrons combine with U-235 to form heavier elements, releasing energy as mass is converted to energy. Nuclear fission; the nuclei released by the split are absorbed by the control rods and converted directly into electrical energy. Nuclear fusion; the splitting releases neutrons that fuse with each other to form new uranium nuclei, sustaining the reaction.

Correct Answer:

Nuclear fission; the neutrons released can split additional U-235 nuclei, forming a chain reaction that is controlled by neutron-absorbing rods.

Question 1

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Prepare with the New Jersey NJSLA Science Grade 11 Practice Questions - New Jersey Student Learning Assessments - Science Grade 11 Exam practice quiz. This question bank includes 100 questions covering describes, energy, explains, correctly, and many. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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New Jersey NJSLA Science Grade 11 Practice Questions - New Jersey Student Learning Assessments - Science Grade 11 Exam

This practice set contains 100 questions from the matching question bank and focuses on describes, energy, explains, correctly, and many. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

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New Jersey NJSLA Science Grade 11 Practice Questions - New Jersey Student Learning Assessments - Science Grade 11 Exam

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