Sodium chloride, NaCl, is formed when a sodium atom transfers its electron to a chlorine atom. The difference in charge between the two atoms creates a(n) ___________ attraction that bonds them together.

Responses

• nuclear

• electrostatic

• gravitational

• elementary

Tags

NGSS.HS-PS1-3

NGSS.HS-PS2-4

Identify the solution that does NOT result in a chemical reaction.

• KCl_(aq) + NaNO_{3 (aq)} → KNO_{3 (aq)} + NaCl_(aq)

• C₃H₇OH_(g) + O_{2 (g)} → CO_{32 (g)} + H₂O_(g)

• HCl_(aq) + NaOH_(aq) → H₂O_(l) + NaCl_(aq)

• Ca(NO₃)_{2 (aq)} + Na₂CO_{3 (aq)} → CaCO_{3 (s)} + 2NaNO_{3 (aq)}

The pH of a cup of black coffee is 5 while the pH of glass of tomato juice is 4. Comparing the pH of the two liquids, the tomato juice has _______________ [H⁺] than the coffee.

• 100 times more

• half as many

• 10 times more

• 10 times less

The strength of an acid or base depends on the degree of ionization in water. The graph represents a

• strong base

• strong acid

• weak acid

• weak base

The combustion of natural gas is represented by the thermochemical equation: CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l);ΔH = -890.3 kJ

Assuming an excess of oxygen, how much heat can you produce if you burn 1 kg of CH₄?

• -1.780 X 10⁶ kJ

• 5.564 X 10⁴ kJ

• 8.903 X 10⁵ kJ

• -5.564 X 10⁴ kJ

Tags

NGSS.HS-PS1-4

Red cabbage is an organic indicator for acids and bases. In the pictures above, assess which test tube(s) may have ammonia dissolved in it and justify the choice.

• Ammonia may be in one of the test tubes on the left since the pH of ammonia is below 7.

• Ammonia could be in the middle or the right test tubes since it is a weak to moderate base.

• Ammonia is probably in the middle since it is naturally a gas and will evaporate off leaving a neutral solution with pH = 7.

• Ammonia could be in a couple of the test tubes on the right since it is a acid.

Tags

NGSS.MS-PS1-2

• ozone

• water

• carbon dioxide

• methane

Tags

NGSS.HS-ESS2-6

NGSS.HS-LS2-5

The reaction vessel currently contains partial partial pressures of P_SO3=0.74 atm, P_SO2=0.29 atm, and P_O2=0.35 atm.

  Determine if the reaction is at equilibrium and if not which direction the reaction needs to move toward to re-establish equilibrium.

• Move toward the reactants.

• Equilibrium stays the same.

• No change in the equilibrium.

• Flow toward the products.

Tags

NGSS.HS-PS1-7

Which aqueous solution will theoretically have the lowest freezing point?

• 0.001 M CaCl₂

• 0.001 M C₆H₁₂O₆

• 0.001 M AlCl₃

• 0.001 M NaCl

KClO₃ ---> KCl + O₂

Balance the decomposition chemical reaction.

• KClO₃ ---> KCl + O₂

• 2KClO₃ ---> KCl + 3O₂

• 2KClO₃ ---> 2KCl + 3O₂

• 2KClO₃ ---> 2KCl + 6O₂

Tags

NGSS.HS-PS1-7