UIL Science Practice

What is the net ionic equation for the reaction of lead(II) nitrate with potassium iodide?

• 2 PbNO₃(aq) + KI(aq) → 2 PbI(s) + KNO₃(aq)

• Pb₂NO₃(aq) + KI(aq) → Pb₂I(s) + KNO₃(aq)

• Pb²⁺(aq) + 2 NO₃^-(aq) + 2 K⁺(aq) + 2 I^-(aq) → PbI₂(s) +

  2 KNO₃(aq)

• Pb²⁺(aq) + 2 I^-(aq) → PbI₂(s)

• K⁺(aq) + NO₃^-(aq) → KNO₃(s)

What phase change occurs between points B and C if heat is added?

• Freezing

• Melting

• Boiling

• Condensing

Tags

NGSS.MS-PS1-4

A Mendelian dihybrid cross in which both parents

are heterozygous for both traits would yield a

phenotypic ratio of_________________ .

• 1:2:1

• 3:1

• 1:1

• 9:3:3:1

• none of the above

What is the correct volume reading for the liquid in

this burette?

• 20.84 mL

• 20.96 mL

• 20.90 mL

• 21.05 mL

• 21.16 mL

What is the sum of the coefficients when this chemical equation is balanced? Fe + H₂SO₄ → Fe₂(SO₄)₃ + H₂

• 12

• 9

• 8

• 7

• 4

Tags

NGSS.MS-PS1-5

How do the intermolecular forces in solid wax compare to the intermolecular forces in molten wax?

• Solid wax has hydrogen bonding but molten

  wax only has dipole-dipole forces.

• Solid wax has hydrogen bonding but molten

  wax only has dispersion forces.

• Solid wax has dipole-dipole attractions, but

  molten wax only has dispersion forces.

• Solid wax has dispersion forces and molten wax

  has no intermolecular forces.

• The intermolecular forces in solid wax and in

  molten wax are the same.

The _______________structure of a protein encompasses ionic bonds, hydrophobic interactions, disulfide bridges, and hydrogen bonds to generate a three dimensional shape.

• primary

• secondary

• tertiary

• quaternary

If you sprinkled table salt into a saturated solution

of lead(II) chloride, what would happen to the

concentrations of the dissolved lead and chloride

ions?

• The lead ion concentration would decrease and

  the chloride concentration would increase.

• The chloride concentration would increase but

  the lead ion concentration would stay the same.

• The table salt would not dissolve, so the lead and chloride concentrations would remain unchanged.

• The lead ions would precipitate out the added chloride ions, so both the lead and chloride ion concentrations would decrease from their initial levels.

• The chloride concentration would increase until

  it was equal to the lead concentration, then no

  more table salt would dissolve.

Tags

NGSS.HS-PS1-5

In a plasma the electrons are no longer associated with a particular nucleus.

• True

• False

My glass of ice water is sitting in the sun and has droplets of water on the outside of the glass. What is happening?

• condensation

• evaporation

• melting

• freezing

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5