Chemistry Midterm Review: Chapter1-2 Matter and Change

Symbol Period number Group number Name Metal, nonmetal, metalloid or noble gas??? Cl Magnesium Iron Sn

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Use dimensional analysis to solve the following conversions. SHOW YOUR WORK!!! 48a) Convert 48,987 minutes to days 48b) Convert 27 months to hours (there are ~30 days in a month) 49a) Convert 0.09 miles to inches (there are 36 inches in a yard and 1760 yards in a mile) 49b) Convert 4.66 inches to miles (there are 36 inches in a yard and 1760 yards in a mile)

Convert 48,987 minutes to days 34.019 days 8) Convert 0.09 miles to inches (there are 36 inches in a yard and 1760 yards in a mile) 1.4 x 10-6 miles

26. Consider the burning of gasoline and the evaporation of gasoline. Which process represents a chemical change and which represents a physical change? Explain your answer.

The burning of gasoline is a chemical change. Any burning process is the thermal decomposition of the burning material. The evaporation of gasoline is a physical change because the gas simply changes state.

Which of these measurements has only nonsignificant zeros? a. 0.0037 mL c. 400. mL b. 60.0 mL d. 506 mL

a. 0.0037 mL

The density of pure diamond is 3.5 g/cm3. What is the volume of a diamond with a mass of 0.25 g? a. 0.071 cm3 c. 3.75 cm3 b. 0.875 cm3 d. 14 cm3

a. 0.071 cm3

. A volume of 1 milliliter is equivalent to a. 1 cubic centimeter. c. 1 liter. b. 1 gram. d. 10-1 cubic decimeters.

a. 1 cubic centimeter.

The graph of two variables that are directly proportional to one another is a. a straight line. c. a parabola. b. an ellipse. d. a hyperbola.

a. a straight line.

Which of the following is an example of a homogeneous mixture? a. air c. raw milk b. orange juice d. marble

a. air

A nonmetal is usually a. brittle. c. a good conductor. b. malleable. d. used to make jewelry.

a. brittle.

If a mixture is uniform in composition, it is said to be a. homogeneous. c.heterogeneous. b. chemically bonded. d. a compound.

a. homogeneous.

The SI base unit for length is the a. meter. c. centimeter. b. millimeter. d. kilometer.

a. meter.

An atom is a. the smallest unit of matter that maintains its chemical identity. b. the smallest unit of a compound. c. always made of carbon. d. smaller than an electron.

a. the smallest unit of matter that maintains its chemical identity.

Noble gases are in Group 18, and are best known because they are a. unreactive. c. rare. b. excellent conductors. d. lanthanides.

a. unreactive.

Which of these measurements has been expressed to three significant figures? a. 0.052 g c. 3.065 g b. 0.202 g d. 500 g

b. 0.202 g

When 64.4 is divided by 2.00, the correct number of significant figures in the result is a. 1. c. 4. b. 3. d. 6.

b. 3.

How is the measurement 0.000065 cm written in scientific notation? a. 65 x 10-6 cm c. 6.5 x 10-6 cm b. 6.5 x 10-5 cm d. 6.5 x 10-4 cm

b. 6.5 x 10-5 cm

Which of the following observations is quantitative? a. The liquid turns blue litmus paper red. b. The liquid boils at 100ºC. c. The liquid tastes bitter. d. The liquid is cloudy.

b. The liquid boils at 100ºC.

A compound is a. a pure substance that cannot be broken down into simpler, stable substances. b. a substance, made of two or more atoms that are chemically bonded, that can be broken down into simpler, stable substances. c. the smallest unit of matter that maintains its chemical identity. d. any substance, whether it is chemically bonded or not.

b. a substance, made of two or more atoms that are chemically bonded, that can be broken down into simpler, stable substances.

Which of the following is an intensive property of matter? a. amount of energy c. volume b. density d. mass

b. density

The density of an object is calculated by a. multiplying its mass times its volume. b. dividing its mass by its volume. c. dividing its volume by its mass. d. adding its mass to its volume.

b. dividing its mass by its volume.

If a mixture is not uniform throughout, it is called a. homogeneous. c.chemically bonded. b. heterogeneous. d. a solution.

b. heterogeneous.

Matter includes all of the following except a. air. c. smoke. b. light. d. water vapor.

b. light.

A numerical result is said to have good precision if a. it agrees closely with an accepted value. b. repeated measurements agree closely. c. it has a small number of significant figures. d. it is a large whole number.

b. repeated measurements agree closely.

. Metalloids are often a. unreactive. c. lanthanides. b. semiconductors. d. from outer space.

b. semiconductors.

Which of these is a measure of Earth's gravitational pull on matter? a. density c. volume b. weight d. mass

b. weight

The measurement 0.035550 g rounded off to two significant figures would be a. 0.03 g. c. 0.036 g. b. 0.35 g. d. 3.5 x 102 g.

c. 0.036 g.

The number of significant figures in the measurement 2010 cm is a. 1. c. 3. b. 2. d. 4.

c. 3.

The density of aluminum is 2.70 g/cm3. What is the mass of a solid piece of aluminum with a volume of 1.50 cm3? a. 0.556 g c. 4.05 g b. 1.80 g d. 4.20 g

c. 4.05 g

When 6.02 x 1023 is multiplied by 9.1 x 10-31, the product is a. 4.3 x 10-8. c. 4.3 x 10-7. b. 4.3 x 1054. d. 4.3 x 10-53.

c. 4.3 x 10-7.

A mixture is a. a combination of pure substances bonded chemically. b. any substance with a uniform composition. c. a blend of any two or more kinds of matter, as long as each maintains its own unique properties. d. any group of elements that are chemically bonded to one another.

c. a blend of any two or more kinds of matter, as long as each maintains its own unique properties.

A homogeneous mixture is also called a. chemically bonded. c. a solution. b. a compound. d. a solute.

c. a solution.

The vertical columns on the periodic table are called a. periods. c. groups. b. rows. d. elements.

c. groups.

Which of the following is not a chemical change? a. rusting c. melting b. igniting d. burning

c. melting

Which of the following is an extensive property of matter? a. melting point c. volume b. boiling point d. density

c. volume

1.06 L of water is equivalent to a. 0.001 06 mL. c. 106 mL. b. 10.6 mL. d. 1060 mL.

d. 1060 mL.

When 1.92 x 10-6 kg is divided by 6.8 x 102 mL, the quotient equals a. 2.8 x 10-4 kg/mL. c. 2.8 x 10-8 kg/mL. b. 2.8 x 10-5 kg/mL. d. 2.8 x 10-9 kg/mL.

d. 2.8 x 10-9 kg/mL.

When 5.7 m is divided by 2 s, the quotient is correctly reported as a. 2.8 m/s. c. 2.9 m/s. b. 2.85 m/s. d. 3 m/s.

d. 3 m/s.

The average distance between the Earth and the moon is 386,000 km. Expressed in scientific notation, this distance is written as a. 386 x 103 km. c. 3.9 x 105 km. b. 39 x 104 km. d. 3.86 x 105 km.

d. 3.86 x 105 km.

Three samples of 1.12 g, 1.8 g, and 1.562 g are mixed together. The combined mass of the three samples, expressed to the correct number of significant figures, would be recorded as a. 4.4 g. c. 4.482 g. b. 4.48 g. d. 4.5 g.

d. 4.5 g.

If 1 inch equals 2.54 cm, how many centimeters equal 1 yard? a. 0.0706 cm c. 30.5 cm b. 14.2 cm d. 91.4 cm

d. 91.4 cm

Which of the following observations is qualitative? a. A chemical reaction was complete in 2.3 seconds. b. The solid had a mass of 23.4 grams. c. The pH of a liquid was 5. d. Salt crystals formed as the liquid evaporated.

d. Salt crystals formed as the liquid evaporated.

It is easy to determine whether a substance is a metal if the substance is a. easy to break down into its components. c. very brittle. b. very hard. d. a good electrical and heat conductor.

d. a good electrical and heat conductor.

Which of the following is not a physical change? a. grinding c. boiling b. cutting d. burning

d. burning

The quantity of matter per unit volume is a. mass. c. inertia. b. weight. d. density.

d. density.

A physical change occurs when a a. peach spoils. b. silver bowl tarnishes. c. bracelet turns your wrist green. d. glue gun melts a glue stick.

d. glue gun melts a glue stick.

The symbols for units of length in order from largest to smallest are a. m, cm, mm, km. c. km, mm, cm, m. b. mm, m, cm, km. d. km, m, cm, mm.

d. km, m, cm, mm.

A measure of the quantity of matter is a. density. c. volume. b. weight. d. mass

d. mass

The SI base units for length and time are a. centimeter and second. c. centimeter and hour. b. meter and hour. d. meter and second.

d. meter and second.

The horizontal rows on the periodic table are called a. actinides. c. elements. b. families. d. periods.

d. periods.

If repeated measurements agree closely but differ widely from the accepted value, these measurements are a. neither precise nor accurate. b. accurate, but not precise. c. both precise and accurate. d. precise, but not accurate.

d. precise, but not accurate.