Chem unit 1 & 2 test

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

0.0037 mL

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

0.036 g

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 0.875 cm3 b 3.75 cm3 c 14 cm3 d 0.071 cm3

0.071 cm3

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

0.202 g

0.05 cm is the same as a 0.5 mm. b 0.000 05 m. c 0.05 m. d 0.005 mm.

0.5 mm

100 milliliters is equivalent to a 1 deciliter. b 1 centiliter. c 1 microliter. d 1 hectoliter.

1 deciliter

An analytical balance can measure mass to the nearest 0.0001 g. In scientific notation, the accuracy of the balance would be expressed as a 1 x 104 g. b 1.0 x 10-3 g. c 1 x 10-4 g. d 1 x 103 g.

1 x 10-4 g.

What is 1.245 633 501 x 108 rounded to four significant figures? a 1246 b 1.246 x 104 c 1.246 x 108 d 1.2456 x 108

1.246 x 108

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

1060 mL.

Using a metric ruler with 1 mm divisions, the sides of a rectangular piece of plywood were measured as 3.54 cm and 4.85 cm, which corresponds to an area of 17.1690 cm2. Which of these shows the area expressed correctly? a 17.2 cm2. b 17.1 cm2. c 17.17 cm2. d 17.169 cm2.

17.2 cm2

A sample of gold has a mass of 96.5 g and a volume of 5.00 cm3. The density of gold is a 101.5 g/cm3. b 483 g/cm3. c 19.3 g/cm3. d 0.0518 g/cm3.

19.3 g/cm3

How many significant digits should be shown in the product of 1.6 cm and 2.4 cm? a 2 b 1 c 3 d 4

2

The measurement 0.020 L is the same as a 2.0 x 102 L. b 2.0 x 10-1 L. c 2.0 x 10-2 L. d 2.0 x 10-3 L.

2.0 x 10-2 L.

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

2.8 x 10-9 kg/mL.

In the winter, the outdoor temperature is -12 °F. What is the temperature in the Kelvin scale? a 249 K b 262 K c 284 K d 273 K e 178 K

249 K

0.25 g is equivalent to a 0.025 kg. b 250 mg. c 0.025 mg. d 250 kg.

250 mg

How many significant figures would the answer to the following calculation have?3.475 x 1.97 + 2.4712 is a 5 b 2 c 4 d 3

3

The number of significant figures in the measured value 0.0320 g is a 4. b 3. c 2. d 5.

3

The number of significant figures in the measurement 0.000305 kg is a 6. b 7. c 3. d 2.

3

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

3

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

3

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

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 3.86 ´ 105 km. b 386 ´ 103 km. c 39 ´ 104 km. d 3.9 ´ 105 km.

3.86 ´ 105 km.

Which of these measurements has been expressed to four significant figures? a 402.10 mm b 30.00 mm c 0.0020 mm d 0.0402 mm

30.00 mm

On a hot day, the thermometer reads 95 °F. What is the temperature in degrees Celsius? a 77 °C b 113 °C c 35 °C d 63 °C e 178 °C

35 °C

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 4.05 g b 1.80 g c 4.20 g d 0.556 g

4.05 g

The dimensions of a rectangular solid are measured to be 1.27 cm, 1.3 cm, and 2.5 cm. The volume should be recorded as a 4.12 cm3. b 4.1 cm3. c 4.13 cm3. d 4.128 cm3.

4.1 cm3

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

4.3 x 10-7.

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. b 4.482 g. c 4.5 g. d 4.48 g.

4.5 g

A temperature of 41 °F is the same as ________°C. a 5 b 310 c -9 d 16 e 42

5

What is the density of 37.72 g of material whose volume is 6.80 cm3? a 0.180 g/cm3 b 256. g/cm3 c 30.9 g/cm3 d 5.55 g/cm3

5.55 g/cm3

The number of grams equal to 0.5 kg is a 0.005. b 500. c 0.0005. d 5000.

500

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

6.5 x 10-5 cm

The product of 13 cm and 5.7 cm is correctly reported as a 74.0 cm2. b 75 cm2. c 74.1 cm2. d 74 cm2.

74 cm2

How would 0.00930 m be expressed in scientific notation? a 9.30 ´ 10-5 m b 93 ´ 10-4 m c 9.30 ´ 10-3 m d 9.3 ´ 10-4 m

9.30 ´ 10-3 m

Identify the chemical change in the following list. a A shoelace breaks. b A house burns. c A cat meows. d A crayon melts in the sun. e Water falls from the sky as hail.

A house burns

The relationship between the mass m of a material, its volume V, and its density D is a D = m/V. b D = V/m. c D = m + v. d D = mV.

D = m/V

Which of these statements about density is true? a Larger objects are more dense. b Density is a physical property. c Density does not depend on temperature. d The density of an object depends on the force of gravity.

Density is a physical property

Identify the chemical change in the following list. a Gold metal is formed from gold chloride in solution. b Wax is melted out of a mold in a kiln. c Plaster of paris is ground to a powder for making a mold. d A gold ring is resized to fit a new owner. e A diamond is set into a gold ring.

Gold metal is formed from gold chloride in solution.

Which one of the following properties describes a liquid? a It has its own shape. b Its particles are close together and move randomly. c Its particles move very rapidly. d It fills the entire volume of the container. e There is essentially no interaction between the particles.

Its particles are close together and move randomly.

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

Salt crystals formed as the liquid evaporated.

Identify the physical change in the following list. a A candle is burned to give light. b A silver candlestick tarnishes in the presence of air. c The chemical silver nitrate produces a dark brown stain on skin. d A piece of copper placed in a solution of silver nitrate develops a coating of silver metal. e Silver is melted and formed into a candlestick.

Silver is melted and formed into a candlestick.

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

The liquid boils at 100°C.

Which of the following is a property of a solid? a It takes the shape of the container. b It fills the volume of the container. c The particles move at a rapid rate. d The interactions between its particles are very weak. e The particles have fixed positions and are very close together.

The particles have fixed positions and are very close together.

Identify the physical change in the following list. a Yarn is decomposed by a lighted cigarette. b Yarn is knitted into a cape. c Cotton can be converted to a new substance by the addition of nitric acid. d Linen produces a black, charred substance when treated with sulfuric acid. e Silk fibers can be digested by moths.

Yarn is knitted into a cape.

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

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

When an egg is fried, what type of process is happening? a condensation b evaporation c a physical change d a chemical change e melting

a chemical change

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

a good electrical and heat conductor.

When gold is melted and formed in a mold to make a piece of jewelry, what type of change is taking place? a a chemical change b a change of size c evaporation d boiling e a physical change

a physical change

When you observe the formation of fog on a cool, humid day, what type of event are you observing? a a chemical change in oxygen b a physical change in air c a physical change in water d a chemical change in water e a combination of nitrogen and oxygen

a physical change in water

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

a solution.

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

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

A measurement that closely agrees with an accepted value is best described as a reproducible. b precise. c significant. d accurate.

accurate

A solid substance is a always frozen regardless of its container. b always losing particles regardless of its container. c always the same shape regardless of its container. d always a crystal regardless of its container.

always the same shape regardless of its container.

A chemical can be defined as a any substance that is not alive. b a toxic substance. c any substance that has a definite composition. d an unnatural additive placed in food.

any substance that has a definite composition

When a firecracker explodes, giving off light and heat, and breaking the wrapper into many pieces, ________. a a physical change takes place b a chemical change takes place c both a physical and a chemical change are taking place d the wrapper evaporates into a gas e the fuse undergoes a physical change only

both a physical and a chemical change are taking place

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

brittle

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

burning

Which of the following would NOT be a physical change? a freezing water to make ice cubes b tearing a piece of aluminum foil c boiling water for soup d burning gasoline in a lawnmower e melting gold to make jewelry

burning gasoline in a lawnmower

Which of the following is a chemical change? a cutting a rope b bending a steel rod c making a snowman d burning sugar e melting gold

burning sugar

Compounds can be broken down into their elements by ________. a physical processes b melting c evaporation d cooling e chemical processes

chemical processes

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

density

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

density

Which of the following is an example of a chemical change? a grinding pepper b melting candle wax c freezing water d digesting a hot dog e cracking an egg

digesting a hot dog

Which is the chemical change in the following list? a grinding of wheat to make flour b digestion of bread c using modeling clay to make a toy horse d drying clothes in the sunshine e mixing sand and water to make mud

digestion of bread

Which of the following is a physical change? a baking a cake b dry ice subliming c fermenting grapes to produce wine d digesting a meal e a tomato ripening

dry ice subliming

Alloys are more expensive and softer than pure metals. True False

false

Suspension is a type of heterogeneous mixture that settles over time such as sugar dissolved in water. True False

false

The difference between 18K and 24K gold is that 18K gold is pure metal, and 24K gold is an alloy mixture. True False

false

Which of these metric units is used to measure mass? a g b mm c m d L

g

Which of the following is an example of a heterogeneous mixture? a sucrose b granite c a gold ring d seawater

granite

Which of the following is an example of a physical change? a grinding coffee beans b baking a cake c converting water to hydrogen and oxygen d digesting a cheeseburger e burning coal

grinding coffee beans

Which of the following is an example of a physical change? a grinding pepper b burning a candle c converting hydrogen and oxygen to water d digesting a hot dog e frying an egg

grinding pepper

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

groups

The liquid state of matter can be described as a having neither a definite shape nor a definite volume. b having definite shape and definite volume. c having a definite volume but not a definite shape. d having lost electrons owing to energy content.

having a definite volume but not a definite shape.

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

heterogeneous

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

homogeneous

A pure substance is matter that consists of matter with a composition that ________. a is fixed in a definite proportion at all times b varies according to the amount of water present c depends on the temperature d always contains oxygen e always contains two or more substances

is fixed in a definite proportion at all times

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

km, m, cm, mm

Which of these symbols represents a unit of volume? a cm b mg c mm d mL

mL

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

mass

All of the following are examples of units except a ounce. b mass. c gram. d kilometer.

mass

Which of these is a measure of the amount of material? a density b weight c mass d volume

mass

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

melting

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

meter

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

meter and second

The symbol mm represents a milliliter. b millimeter. c meter. d micrometer.

millimeter

All known chemical elements are organized into groups based on similar chemical properties in the a chemical chart. b periodic chart. c element table. d None of the above

periodic chart

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

periods

When saccharine dissolves in water, this event is an example of a ________. a physical change b chemical change c change of shape d change of state e change of size

physical change

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

precise, but not accurate

These values were recorded as the mass of products when a chemical reaction was carried out three separate times: 8.83 g; 8.84 g; 8.82 g. The mass of products from that reaction is8.60 g. The values are a both accurate and precise. b precise, but not accurate. c accurate, but not precise. d neither accurate nor precise.

precise, but not accurate.

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

repeated measurements agree closely

Which of the following is an example of a homogeneous mixture? a sand mixed with oil b salt dissolved in water c table sugar d gasoline mixed with water e ball bearings in a box

salt dissolved in water

Which of the following is an example of a heterogeneous mixture? a sand mixed with oil b salt dissolved in water c air d coffee e vinegar

sand mixed with oil

The SI base unit for time is the a hour. b second. c day. d minute.

second

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

semiconductors.

The physical state(s) present when a substance is melting is (are) ________. a solid b liquid c gas d solid + liquid e liquid + gas

solid + liquid

In which of the following would the particles move most rapidly? a ice at -20 °C b water at 20 °C c steam at 110 °C d boiling water e ice at 0 °C

steam at 110 °C

The two most important properties of all matter are a taking up space and having mass. b the ability to carry an electric current well and to hold electric charge. c being malleable and ductile. d being brittle and hard.

taking up space and having mass

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

the smallest unit of matter that maintains its chemical identity

Alloy is a homogeneous mixture of metals. True False

true

Bronze is an alloy mixture of copper and tin. True False

true

Pewter is an alloy mixture of lead and tin. True False

true

Compounds are pure substances that by definition consist of ________. a a single element b oxygen and hydrogen c two or more elements in combination d solids e gases

two or more elements in combination

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

unreactive

The unit m3 measures a volume. b length. c area. d time.

volume

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

volume

Which pair of quantities determines the density of a material? a volume and concentration b mass and weight c volume and mass d volume and weight

volume and mass

Which of the following is a physical change? a wood burning in a fireplace b water freezing c iron rusting d digesting food e milk souring

water freezing

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

weight

Which of the following is a chemical change? a wood burning in a fireplace b ice melting to water c chopping wood for a fire d sewing a button on a shirt e pouring water into a glass

wood burning in a fireplace