CHEM 0100 Test #1 (Ch. 1 + 2)
An empty container has a mass of 112 grams. When 25 milliliters of a liquid are added to the container, the combined mass of the container and liquid are 134 grams. What is the density of the liquid?
Selected Answer: Correct 0.88 g/mL
Magnesium has a density of 1.7 g/cm3 and iron has a density of 7.9 g/cm3. A block of iron has a mass of 819 g. What is the mass of a block of magnesium that has the same volume as the block of iron?
Selected Answer: Correct 1.8 x 10^2 g
When 7.02 grams of a compound containing only carbon and hydrogen was burned completely in 25.5 grams of oxygen, 21.0 grams of carbon dioxide and water were formed. What mass of water was formed?
Selected Answer: Correct 11.52 grams
A certain compound contains 78.54% carbon and 21.46% hydrogen. How much carbon is in a 3.44 g portion of this sample?
Selected Answer: Correct 2.70 g
Calculate the density of a 31.2 g rectangular object that is 2.4 cm long, 1.8055 cm wide, and 1.232 cm thick. (Remember that the volume of a rectangular object is calculated by multiplying the length, width and thickness of the object.)
Selected Answer: Correct 5.8 g/mL
Convert 240 K and 468 K to the Celsius scale.
Selected Answer: Correct -33 °C and 195 °C
In the Antarctic the temperature can be -58 degrees Celsius. What is this temperature in degrees Fahrenheit?
Selected Answer: Correct -72 degrees Fahrenheit
How many meters are in 1 centimeter (cm)?
Selected Answer: Correct 0.01 m
How many grams are in 125 mg?
Selected Answer: Correct 0.125 g
A 2.00 L sample of helium weighs 0.358 g. What is the density of helium?
Selected Answer: Correct 0.179 g/L
Calculate the number of liters in 385 cm3.
Selected Answer: Correct 0.385 L
A car is travelling a speed of 65 miles per hour. How far does the car travel in 35 seconds? (60 minutes = 1 hour; 60 seconds = 1 minute).
Selected Answer: Correct 0.63 miles
An object has a length of 0.25 inches. What is this length expressed in centimeters? (2.54 cm = 1 inch)
Selected Answer: Correct 0.64 cm
You have a mixture that contains only salt and sugar. The mixture has a mass of 1.5 kilograms and is 45% salt. How many kilograms of sugar are in the mixture?
Selected Answer: Correct 0.83 kg
Calculate the density of an object that has a volume of 13.28 mL and a mass of 11.3 g.
Selected Answer: Correct 0.851 g/mL
A 3.557 g sample of iron(III) oxide was decomposed into iron and oxygen, yielding 2.284 g of iron. How many grams of oxygen were obtained?
Selected Answer: Correct 1.273 g
Convert 16200 mm to centimeters and express your answer in exponential notation.
Selected Answer: Correct 1.62x103 cm
A sample of a compound has a mass of 16.7 grams. This compound contains 39.35% of compound "C" and 60.65% compound "D". What mass of compound "D" is present in the compound?
Selected Answer: Correct 10.13 grams
A sample of a mineral is 25.3% iron. How many grams of iron are in a 500.0-gram sample of the mineral?
Selected Answer: Correct 127 g iron
Calculate the number of cubic centimeters in a rectangular box 0.385 m long, 4.6 cm wide, and 0.000078 km thick. (Hint: convert the "0.385 m" length and the "0.000078 km" length to centimeters first.)
Selected Answer: Correct 1400 cm3
Calculate the number of cubic centimeters in a rectangular box 0.063 m long, 8.8 cm wide, and 0.000028 km thick. (Hint: convert the "0.063 m" length and the "0.000028 km" length to centimeters first.)
Selected Answer: Correct 160 cm3
Which of the following correctly represents 235,000,000,000 in scientific notation?
Selected Answer: Correct 2.35 x 10^11
In a basketball player, the femur (thigh bone) may have a length of 0.525 meters. How many inches long is that femur? (2.54 centimeters = 1 inch)
Selected Answer: Correct 20.7 inches
How many meters are in 2 kilometers?
Selected Answer: Correct 2000 m
Calculate the number of seconds in 3.574 minutes.
Selected Answer: Correct 214.4 seconds
Convert 2.283 meters to centimeters.
Selected Answer: Correct 228.3 cm
A 28.23-g sample of a compound contains 83.02% potassium and 16.98% oxygen. Calculate the mass of potassium present in the sample.
Selected Answer: Correct 23.44 g
Calcium and fluorine react to form one compound only. In a certain reaction, 4.523 g of calcium reacts completely with 4.288 g of fluorine to produce calcium fluoride. How much calcium will react with 22.48 g of fluorine?
Selected Answer: Correct 23.71 g
A balmy day in South Dakota is 75oF. What is this temperature in Celsius?
Selected Answer: Correct 24oC
How many elements are present in the formula "C6H12O6"?
Selected Answer: Correct 3
A certain compound contains 78.23% carbon and 21.77% hydrogen. How much carbon is in a 4.23 g portion of this sample?
Selected Answer: Correct 3.31 g
Convert the number to expanded notation: 3.40x104
Selected Answer: Correct 34000
The density of aluminum is 2.70 g/mL. If you use 108 g of aluminum foil, what is its volume in mL?
Selected Answer: Correct 40.0 mL
The temperature inside your car after sitting in the sun on a hot day is 106oF. What is this temperature expressed in Celsius?
Selected Answer: Correct 41.1oC
If a can of tomato juice is 0.500 quart, how many milliliters are in the can? (1 liter = 1.0567 quarts).
Selected Answer: Correct 473 mL
20.9 kilojoules is equivalent to _________ kilocalories. Fill in the blank. (1 calorie = 4.184 joules)
Selected Answer: Correct 5.00
You have 3.0 liters of milk. What is this volume expressed in pints? (0.472 L = 1 pint)
Selected Answer: Correct 6.4 pints
A sample of a compound has a mass of 16.7 grams. This compound contains 39.35% of element "C" and 60.65% element "D". What mass of element "C" is present in the compound?
Selected Answer: Correct 6.57 grams
What is the number "0.00684" written in scientific notation?
Selected Answer: Correct 6.84 x 10-3
In an experiment, 28.39 grams of sodium and 43.76 grams of chlorine react completely to form the compound sodium chloride. Sodium chloride is the only product formed in this chemical reaction. What is the percentage of chlorine in sodium chloride?
Selected Answer: Correct 60.65%
Calculate the mass of 4.5 mL of mercury (density of mercury = 13.6 g/mL).
Selected Answer: Correct 61 g
If a can of dog food contains 22.0 ounces of dog food, how many grams would that be? (1 pound = 454 grams, 1 pound = 16 ounces)
Selected Answer: Correct 624 g
A 75.0-gram sample of element "A" reacts completely with element "B" to make 112.7 grams of one pure compound. What is the percentage of element "A" in the compound?
Selected Answer: Correct 66.5%
An object has a density of 0.45 grams per milliliter and a volume of 1600 milliliters. What is the mass of this object?
Selected Answer: Correct 720 grams
An example of a number written is scientific notation is 7.87 x 105. What is another way of representing this number?
Selected Answer: Correct 787000
Calculate the number of milliliters of magnesium having a mass of 14.22 g. (Density of magnesium = 1.74 g/mL)
Selected Answer: Correct 8.17 mL
Convert 834 m to centimeters and express your answer in exponential notation.
Selected Answer: Correct 8.34 x 10^4 cm
A particular metal has a volume of 9.60 mL and a mass of 85.44 grams. What is the density of this metal?
Selected Answer: Correct 8.90 g/mL
The speedometer in your car reads 55 miles per hour (miles/hour). What is this speed expressed in kilometers per hour (km/hour)? (1 km = 0.621 miles)
Selected Answer: Correct 89 km/hr
An object has a length of 25 centimeters. What is this length expressed in inches? (2.54 cm = 1 inch)
Selected Answer: Correct 9.8 inches
Which of the following is heterogeneous? Ethanol dissolved in water Table salt A mixture of sand and salt Sugar
Selected Answer: Correct A mixture of sand and salt
What is the name commonly given to the elements of Group IA on the periodic table?
Selected Answer: Correct Alkali metals
Which of the following is the smallest particles found in matter?
Selected Answer: Correct Atoms
What is the symbol for gold? Au Gd Ag As Go
Selected Answer: Correct Au
Which element is an alkaline earth metal? Potassium Calcium Argon Nickel Fluorine
Selected Answer: Correct Calcium
Pure substances that only have one type of atom are called what?
Selected Answer: Correct Elements
In order to melt solid water (ice) to form liquid water, energy must be added in the form of heat. Is this process exothermic or endothermic?
Selected Answer: Correct Endothermic
You must add energy in the form of heat to convert liquid water to gaseous water (steam). Is this process exothermic or endothermic?
Selected Answer: Correct Endothermic
In order to condense gaseous water (steam) to liquid water, energy must be removed or released in the form of heat. Is this process exothermic or endothermic?
Selected Answer: Correct Exothermic
The burning (combustion) of natural gas produces a fair amount of heat. Is this process exothermic or endothermic?
Selected Answer: Correct Exothermic
Gases, like oxygen gas and hydrogen gas, all have densities equal to zero because gases do not have mass. True or False?
Selected Answer: Correct False
Heating a material will always result in a chemical change occuring to that material. True or False?
Selected Answer: Correct False
Heating a material will always result in a chemical change occuring to that material. True or False?
Selected Answer: Correct False
One calorie is equivalent to one thousand kilocalories. True or False?
Selected Answer: Correct False
Sodium is an example of a metal. Therefore, a piece of sodium must be heterogeneous. True or False?
Selected Answer: Correct False
The air that you breathe contains oxygen gas, nitrogen gas, and other gases. Therefore, air is an example of a compound. True or False?
Selected Answer: Correct False
The symbol for potassium is P. True or False?
Selected Answer: Correct False
There are more nonmetals than metals on the periodic table. True or False?
Selected Answer: Correct False
You put a cup of water in your freezer. After a few hours the water converts to ice. This is an example of a chemical change. True or False?
Selected Answer: Correct False
The formula for a particular oxide is Al2O3. Make an educated guess as to which of the following compounds exists. Si2O3 Ge2O3 Al2F3 Ga2O3
Selected Answer: Correct Ga2O3
Which state of matter has particles separated by the greatest amount of distance? Solid Liquid Gas Solid in a liquid
Selected Answer: Correct Gas
Which term applies to the vertical columns found on the periodic table?
Selected Answer: Correct Group
Which element is a noble gas? Oxygen Fluorine Helium Bromine Cesium
Selected Answer: Correct Helium
Using a periodic table, determine which element is in period 5? Na I Hg U None of the elements listed above are in period 5
Selected Answer: Correct I
Which of the following represents an element?
Selected Answer: Correct I2
Which is not a metal? Calcium Magnesium Iron Iodine
Selected Answer: Correct Iodine
Which element is a transition metal? Calcium Iron Lithium Nitrogen Boron
Selected Answer: Correct Iron
Look at a periodic table and determine which one of the following elements has properties most like calcium? Mg K Sc Ne Na
Selected Answer: Correct Mg
Which element is an alkali metal? Nickel Manganese Sodium Copper Lead
Selected Answer: Correct Sodium
Which of the following is a homogeneous mixture? Sugar dissolved in water Sand and water Vegetable oil and water None of these are homogeneous mixtures
Selected Answer: Correct Sugar dissolved in water
A 16.12-gram sample of calcium was burned, yielding 22.57 grams of calcium oxide. 6.45 grams of oxygen was reacted during this reaction. True or False?
Selected Answer: Correct True
A calorie is a unit of energy. True or False?
Selected Answer: Correct True
A sample of pure oxygen gas is homogeneous. True or False?
Selected Answer: Correct True
A sample of pure solid chromium is homogeneous. True or False?
Selected Answer: Correct True
Glucose is a compound made up of carbon, hydrogen and oxygen atoms. You are given a 5.0 gram sample of glucose and a 10.0 gram sample of glucose. Each sample contains the same percentage of carbon, oxygen and hydrogen. True or False?
Selected Answer: Correct True
Hydrogen is in a diatomic state when free in nature. True or False?
Selected Answer: Correct True
Ice is water in a solid state. True or False?
Selected Answer: Correct True
The symbol for sodium is Na. True or False?
Selected Answer: Correct True
The temperature 100oF is hotter than the temperature 100oC. True or False?
Selected Answer: Correct True
There are more metals than nonmetals on the periodic table. True or False?
Selected Answer: Correct True
Water can exist in more than one state of matter. True or False?
Selected Answer: Correct True
You are given a cup of water and a teaspoon of salt. You add the salt to the water and stir. The salt dissolves. This is an example of a physical change. True or False?
Selected Answer: Correct True
You are given a piece of metal that is at room temperature (25oC). You determine the density of the metal to be 1.8 grams per milliliter. You then heat the metal to 100oC. You notice that the volume of the metal increases as you heat it but that the mass of the metal remains unchanged. The density of the hot metal will be less than 1.8 grams per milliliter. True or False?
Selected Answer: Correct True
Which of the following is a physical change? A log is burned in a fireplace A marshmallow is toasted A green banana ripens Vodka is distilled into alcohol and water A cupcake is digested
Selected Answer: Correct Vodka is distilled into alcohol and water
What is the name of the group (family) that includes the elements magnesium, calcium, and barium?
Selected Answer: Correct alkaline earth metals
Sodium is an example of a metal. Therefore, a piece of sodium must be heterogeneous. True or False?
Selected Answer: Incorrect True
