2024-25 RHS Chemistry Review Part 4of4 TEKS 11ABCDF

Heart cells require a certain balance of sodium and potassium ions to function. The blood, which is approximately 83% water, carries these two types of ions to the heart. The property of water that allows it to carry ions to the heart is its—

• molecular mass

• specific heat

• polarity

• density

Which of the following substances is a strong electrolyte when dissolved in water?

• NaNO₃

• C₂H₅OH

• S₂Cl₂

• C₁₂H₂₂O₁₁

Tags

NGSS.HS-PS1-3

Which mixture can be separated through filtration because one of the substances is insoluble in water?

• NaClO₃ and Pb(ClO₃)₂

• Na₂SO₄ and SrSO₄

• NaNO₃ and Pb(NO₃)₂

• NaC₂H₃O₂ and Pb(C₂H₃O₂)₂

What volume of 1.0 M sodium phosphate, to the nearest tenth of a liter, must be used to make 4.0 L of 0.80 M sodium phosphate?

• 3.2 L

• 2.0 L

• 4.8 L

• 0.8 L

Which of these is the IUPAC name for H3PO4(aq)?

• Trihydrogen phosphite

• Phosphoric acid

• Phosphorous hydroxide

• Phosphorous acid

A sample of a compound is added to distilled water in a clean beaker. A reaction occurs, and the water temperature drops rapidly. Which of the following statements is best supported by this observation?

• An endothermic reaction occurred.

• A dehydration reaction occurred.

• The water was originally warmer than the compound.

• The beaker was contaminated by another compound.

Tags

NGSS.HS-PS1-4

Which particle has the lightest mass?

• ⁴₂He

• ⁰₋₁e

• ¹₁H

• ¹₀n

A form of technetium-99 has a half-life of approximately 6 hours. 99/43 Tc → ___ + 0/-1 e + γ Which substance correctly completes the equation above?

• ⁹⁴₄₂Mo

• ⁹⁴₄₃Te

• ⁹⁹₄₃Es

• ⁹⁹₄₄Ru

Tags

NGSS.HS-PS1-8

Which of the following best describes this reaction?

• Nuclear fusion is occurring because many smaller nuclei are being fused.

• Nuclear fission is occurring because large amounts of energy are being absorbed.

• Nuclear fusion is occurring because many energetic neutrons are being emitted.

• Nuclear fission is occurring because a nucleus is being split into smaller nuclei.

Tags

NGSS.HS-PS1-8