Practice Exam Answers

Which type of reaction does this diagram represent?

Which substance has the lowest open bracket cap h raised to the plus power close bracket concentration but is still considered an acid?

Why would a doctor most likely restrict a patient’s contact with other people while the patient receives internal radiation?

After a radioactive atom decays, it is the same element that it was before with no measurable change in mass. Which kind of decay has occurred, and how do you know?

When ammonium chloride is dissolved in water, the beaker gets cold. Which type of reaction does this describe?

Consider the reaction. 2 Al sub 2 cap o sub 3 rightarrow 4 Al plus 3 cap o sub 2 How many moles of oxygen are produced if 11 point 0 mol of Al are produced?

Which statement describes the law of conservation of energy?

Brownian motion is not observed in a mixture that includes two phases. Which best identifies the mixture?

Which energy changes are associated with a liquid freezing?

Consider these intermediate chemical equations. cap p sub 4 times s plus 3 cap o sub 2 g rightarrow cap p sub 4 cap o sub 6 s triangle cap h sub 1 is equal to negative 1 comma 640 kJ cap p sub 4 cap o sub 10 s rightarrow cap p sub 4 times s plus 5 cap o sub 2 g triangle cap h sub 2 is equal to 2 comma 940 point 1 kJ What is the enthalpy of the overall chemical reaction cap p sub 4 cap o sub 6 s plus 2 cap o sub 2 g rightarrow cap p sub 4 cap o sub 10 s ?

A gas cylinder contains 2 point 0 mol of gas cap x and 6 point 0 mol of gas cap y at a total pressure of 2 point 1 atm. What is the partial pressure of gas cap y ? Use the fraction with numerator cap p sub A and denominator cap p sub cap t is equal to the fraction with numerator n sub A and denominator n sub cap t

The chemical equation shows the decomposition of ammonium nitrate open paren NH sub 4 NO sub 3 close paren NH sub 4 NO sub 3 rightarrow cap n sub 2 cap o plus 2 cap h sub 2 cap o A chemist who is performing this reaction starts with 160 point 1 g of NH sub 4 NO sub 3 The molar mass of NH sub 4 NO sub 3 is 80 point 0 3 g over mol ; the molar mass of water open paren cap h sub 2 cap o close paren is 18 point 0 1 g over mol What mass, in grams, of cap h sub 2 cap o is produced?

A compound accepts electrons from another substance to form a covalent bond. Which term best describes this compound’s behavior?

A sample contains 25 percent parent isotope and 75 percent daughter isotopes. If the half-life of the parent isotope is 72 years, how old is the sample?

The combustion of glucose, cap c sub 6 cap h sub 12 cap o sub 6 s , produces carbon dioxide, CO sub 2 times g , and water, cap h sub 2 cap o g , according to the equation. cap c sub 6 cap h sub 12 cap o sub 6 s plus 6 cap o sub 2 g rightarrow 6 CO sub 2 g plus 6 cap h sub 2 cap o l The enthalpy of the reaction is negative 2 comma 840 kJ What is the heat of combustion, per mole, of glucose?

A chemist dilutes a 1 point 0 milliliters sample of 2 point 0 cap m KNO sub 3 by adding water to it. If the concentration of the solution that is obtained is 0 point 0 0 8 0 cap m , what is its volume? Use cap m sub i cap v sub i is equal to cap m sub f cap v sub f

An unknown substance turns methyl orange solution red. This shows that the substance

Which factor influences both solubility and the rate of dissolution?

Consider this chemical equation. Mg OH sub 2 plus 2 HNO sub 3 rightarrow Mg open paren NO sub 3 close paren sub 2 plus 2 cap h sub 2 cap o Which is the net ionic equation?

The volume of a gas decreases to half of its original volume, but the gas maintains the same number of moles and temperature. According to the ideal gas law, what will most likely happen to the pressure?