Chemistry SOL J-labs

The following is a test from the Chemistry J-Lab.  Use ctrl + f to find the question and answer.

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-JC


According to the kinetic-molecular theory of gases, molecules of an ideal gas -

Correct Answer:

"undergo elastic collisions"

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Hydrogen chloride can be formed from hydrogen and chlorine as shown in the reaction.

H2 + Cl2 → 2HCl + heat

Chlorine and fluorine are located in the same group in the periodic table. If the reaction were performed with fluorine instead of chlorine, how many moles of H2 would be required to balance the equation?

Correct Answer:

"1"
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According to Boyle's law, the relationship between the pressure and volume of a gas at constant temperature is -

Correct Answer:

"inversely proportional"
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Which set of coefficients will balance this equation?

BlankAl + BlankHCl → BlankAlCl3 + BlankH2

Correct Answer:

"2, 6, 2, 3"
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Which of the following liquids would exhibit the highest vapor pressure at 25.0°C?

Correct Answer:

"Ether, boiling point = 34.6°C"
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Selected Polyatomic Ions

Chlorine and bromine are in the same family in the periodic table. According to the information in the table above, what would be the correct formula for sodium bromate?

Correct Answer:

"NaBrO3"
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Water molecules.

The diagram shows water molecules in an open beaker and water molecules that have evaporated into the air above the beaker. Which change in this system will increase the rate of evaporation?

Correct Answer:

"Increasing the temperature of the water"
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How many liters of oxygen are required to produce 2 liters of water at STP?

Correct Answer:

"1"
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According to their placement on the periodic table, which elements would have the most similar atomic structure?

Correct Answer:

"Sodium and potassium"
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What is the empirical formula of the compound with the molecular formula C6H12?

Correct Answer:

"CH2"
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Which basic lab technique involves the separation of a mixture's components through differences in particle size?

Correct Answer:

"Filtration"
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In order to determine the identity of a substance, a student listed the following properties. Which of the following is a chemical property?

Correct Answer:

"Oxidizes in air"
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An alien astronaut landed on Earth and created the periodic table shown. The astronaut was trying to determine what type of bond would be present in several compounds. The type of bond in a compound containing G and E would be -

Correct Answer:

"an ionic bond"
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Chlorine forms a 1- ion. How many electrons does a chloride ion have?

Correct Answer:

"18"
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An example of a chemical property is -

Correct Answer:

"tendency to undergo oxidation"
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Which of these elements has the smallest atomic radius?

Correct Answer:

"Oxygen (O)"
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When CuSO4 • 5H2O is heated in a crucible, there is a loss of water. How should a student determine the amount of water lost?

Correct Answer:

"Subtract the mass of the CuSO4 from the mass of CuSO4 • 5H2O"
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When examining the physical properties of an unknown substance, which of the following characteristics is unsafe to observe?

Correct Answer:

"Taste"
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Using the chart above, which of these combinations will probably form a precipitate?

Correct Answer:

"Copper (II) carbonate"
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Very Active Metal + Water → Metal Hydroxide + ?

Which of these completes this reaction?

Correct Answer:

"Hydrogen"
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What is the molar mass of Al(NO3)3?

Correct Answer:

"213 g/mol"
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Which of the following properties decreases from left to right across a period?

Correct Answer:

"Atomic radius"
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R = 8.31 kPa-Dm^3/moles-K

A gas cylinder with a volume of 3.00 dm3 contains 8.00 moles of oxygen gas at a temperature of 50.0 K. What is the pressure inside the cylinder?

Correct Answer:

"1110 kPa"
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Which of the following particles has a positive one (+1) charge?

Correct Answer:

"Proton"
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The coefficients of the correctly balanced equation for the reaction illustrated above are -

Correct Answer:

"2, 2, 1"
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Which type of reaction is represented here?

Na2CO3 + Ca(OH)2 → 2NaOH + CaCO3

Correct Answer:

"Double replacement"
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What is the mass of a mole of Ca(OH)2?

Correct Answer:

"74 grams"
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A student has one mole of an unknown compound in a test tube. The mass of the compound is 58.5 g. The compound could be -

Correct Answer:

"NaCl"
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CO2 + H2O → H2CO3

The reaction is which type of chemical reaction?

Correct Answer:

"Synthesis"
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dish + watch glass = 42.70 g, dish + watch glass + NaHCO3 = 45.20 g, dish + watch glass + NaCl = 44.45 g

A student conducted an experiment and was interested in the mass of the product of the chemical reaction. Some results are shown above. What is the mass of the NaCl?

Correct Answer:

"1.75 g"
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What is the percentage of aluminum in aluminum oxide (Al2O3)?

Correct Answer:

"53%"
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0 - Battery Acid; 2 - Lemon Juice; 3 - Apple Juice; 5 - Black Coffee; 7 - Pure Water; 8 - Antacid; 9 - Baking Soda; 10 - Hand Soap; 12 - Household ammonia; 14 - Drain cleaner

According to the pH scale, which substance is slightly acidic?

Correct Answer:

"Black coffee"
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Which of the following best describes why an experiment should be repeated?

Correct Answer:

"To verify the observed results"
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A compound has 50% sulfur and 50% oxygen. What is its empirical formula?

Correct Answer:

"SO2"
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Based on its position in the periodic table, the element sulfur would be expected to have how many valence electrons?

Correct Answer:

"6"
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Which of the following is a chemical change?

Correct Answer:

"Gasoline combusts in an engine."
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How is 0.00124 expressed in proper scientific notation?

Correct Answer:

"1.24 × 10-3"
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The following results of a scientific study on water were found in a chemistry handbook.

Properties of Water

What is the independent variable in the study?

Correct Answer:

"Temperature"
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With n representing the outermost energy level, the electron configuration for that level for elements in Group 14 is -

Correct Answer:

"ns2 np2"
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Solid magnesium has a specific heat of 1.01 J/g°C. How much heat is given off by a 20.0 gram sample of magnesium when it cools from 70.0°C to 50.0°C?

Correct Answer:

"404 J"
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Which of the following shows the correct number of atoms of each element in the formula Mg(NO3)2?

Correct Answer:

"1 magnesium atom, 2 nitrogen atoms, and 6 oxygen atoms"
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Which of these compounds is most likely to contain an ionic bond?

Correct Answer:

"CaCl2"
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Which scientist was the first to conclude through experimentation that atoms have positive charges in their nuclei?

Correct Answer:

"Rutherford"
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Which of these elements is the most chemically active?

Correct Answer:

"F"
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This diagram of a chemical reaction shows that the reaction is -

Correct Answer:

"endothermic"
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