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____22.The first figure in a properly written chemical symbol always is ____.
- capitalized
____23.Which of the following is used for chemical symbols today?
- one or two letter symbols
____24.Which of the following represents a compound?
- H2O, C12H22O11
____25.The chemical formula of a compound does NOT indicate the ____.
- how the elements are joined
____26.Which of the following is a chemical property?
The ability of a substance to undergo a specific chemical change is called a chemical property.
flammability (the ability to catch on fire), toxicity (the ability to be poisonous), oxidation (the ability to react with oxygen, which causes apple slices to turn brown and iron to rust), radioactivity (spontaneously emitting energy in the form of particles or waves by the disintegration of their atomic nuclei), and sensitivity to light (which causes newspaper to turn yellow).
____27.In the chemical reaction in which sucrose is heated and decomposes to form carbon dioxide and water, which of the following is a reactant?
- sucrose?
____28.What must occur for a change to be a chemical reaction?
- one or more substances change into one or more new substances
____29.Which of the following is NOT a physical change?
-
____30.All of the following changes to a metal are physical changes EXCEPT ____.
-
____31.Which of the following does NOT involve a physical change?
-
____32.Which of the following is a chemical property of water at 4C?
-
____33.When paper turns yellow-brown upon exposure to sunlight, what type of change is likely taking place?
- chemical change
____34.Which action changes the identity of the substance referenced?
-
____35.Which of the following is true for all chemical reactions?
- one or more substances change into one or more new substances
____36.What is the result of multiplying 2.5 10 by 3.5 10?
-
____37.What is the result of adding 2.5 10 and 3.5 10?
-
____38.Which of the following measurements contains two significant figures?
sig fig rules...
____39.When a test instrument is calibrated, does its accuracy, precision, or reliability improve?
- accuracy
____40.Which of the following measurements (of different masses) is the most accurate?
-
____41.Three different people weigh a standard mass of 2.00 g on the same balance. Each person obtains a reading of 7.32 g for the mass of the standard. These results imply that the balance that was used is ____.
____42.Which of the following measurements is expressed to three significant figures?
____43.How many significant figures are in the measurement 0.003 4 kg?
____44.How many significant figures are in the measurement 811.40 grams?
____45.Express the sum of 1111 km and 222 km using the correct number of significant digits.
____46.Express the sum of 7.68 m and 5.0 m using the correct number of significant digits.
____47.Express the product of 2.2 mm and 5.00 mm using the correct number of significant digits.
____48.What is the measurement 111.009 mm rounded off to four significant digits?
____49.What is the measurement 1042 L rounded off to two significant digits?
____50.Express the product of 4.0 10 m and 8.1 10 m using the correct number of significant digits.
____51.What is the metric system prefix for the quantity 0.000 001?
____52.Which of the following units is NOT an official SI unit?
____53.Which of the following volumes is the smallest?
____54.What is the temperature of absolute zero measured in C?
____55.What is the boiling point of water in kelvins?
____56.Which of the following mass units is the largest?
____57.What is the temperature –34C expressed in kelvins?
____58.If the temperature changes by 100 K, by how much does it change in C?
____59.Chlorine boils at 239 K. What is the boiling point of chlorine expressed in degrees Celsius?
Commonly Used Metric Prefixes
Prefix
Meaning
mega (M)
1 million times larger than the unit it precedes
kilo (k)
1000 times larger than the unit it precedes
deci (d)
10 times smaller than the unit it precedes
centi (c)
100 times smaller than the unit it precedes
milli (m)
1000 times smaller than the unit it precedes
micro ()
1 million times smaller than the unit it precedes
nano
1000 million times smaller than the unit it precedes
pico (p)
1 trillion times smaller than the unit it precedes
____60.What is the quantity 0.0075 meters expressed in centimeters? Use the table above to help you.
____61.What is the quantity 7896 millimeters expressed in meters? Use the table above to help you.
____62.What is the quantity 987 milligrams expressed in grams? Use the table above to help you.
- capitalized
____23.Which of the following is used for chemical symbols today?
- one or two letter symbols
____24.Which of the following represents a compound?
- H2O, C12H22O11
____25.The chemical formula of a compound does NOT indicate the ____.
- how the elements are joined
____26.Which of the following is a chemical property?
The ability of a substance to undergo a specific chemical change is called a chemical property.
flammability (the ability to catch on fire), toxicity (the ability to be poisonous), oxidation (the ability to react with oxygen, which causes apple slices to turn brown and iron to rust), radioactivity (spontaneously emitting energy in the form of particles or waves by the disintegration of their atomic nuclei), and sensitivity to light (which causes newspaper to turn yellow).
____27.In the chemical reaction in which sucrose is heated and decomposes to form carbon dioxide and water, which of the following is a reactant?
- sucrose?
____28.What must occur for a change to be a chemical reaction?
- one or more substances change into one or more new substances
____29.Which of the following is NOT a physical change?
-
____30.All of the following changes to a metal are physical changes EXCEPT ____.
-
____31.Which of the following does NOT involve a physical change?
-
____32.Which of the following is a chemical property of water at 4C?
-
____33.When paper turns yellow-brown upon exposure to sunlight, what type of change is likely taking place?
- chemical change
____34.Which action changes the identity of the substance referenced?
-
____35.Which of the following is true for all chemical reactions?
- one or more substances change into one or more new substances
____36.What is the result of multiplying 2.5 10 by 3.5 10?
-
____37.What is the result of adding 2.5 10 and 3.5 10?
-
____38.Which of the following measurements contains two significant figures?
sig fig rules...
____39.When a test instrument is calibrated, does its accuracy, precision, or reliability improve?
- accuracy
____40.Which of the following measurements (of different masses) is the most accurate?
-
____41.Three different people weigh a standard mass of 2.00 g on the same balance. Each person obtains a reading of 7.32 g for the mass of the standard. These results imply that the balance that was used is ____.
____42.Which of the following measurements is expressed to three significant figures?
____43.How many significant figures are in the measurement 0.003 4 kg?
____44.How many significant figures are in the measurement 811.40 grams?
____45.Express the sum of 1111 km and 222 km using the correct number of significant digits.
____46.Express the sum of 7.68 m and 5.0 m using the correct number of significant digits.
____47.Express the product of 2.2 mm and 5.00 mm using the correct number of significant digits.
____48.What is the measurement 111.009 mm rounded off to four significant digits?
____49.What is the measurement 1042 L rounded off to two significant digits?
____50.Express the product of 4.0 10 m and 8.1 10 m using the correct number of significant digits.
____51.What is the metric system prefix for the quantity 0.000 001?
____52.Which of the following units is NOT an official SI unit?
____53.Which of the following volumes is the smallest?
____54.What is the temperature of absolute zero measured in C?
____55.What is the boiling point of water in kelvins?
____56.Which of the following mass units is the largest?
____57.What is the temperature –34C expressed in kelvins?
____58.If the temperature changes by 100 K, by how much does it change in C?
____59.Chlorine boils at 239 K. What is the boiling point of chlorine expressed in degrees Celsius?
Commonly Used Metric Prefixes
Prefix
Meaning
mega (M)
1 million times larger than the unit it precedes
kilo (k)
1000 times larger than the unit it precedes
deci (d)
10 times smaller than the unit it precedes
centi (c)
100 times smaller than the unit it precedes
milli (m)
1000 times smaller than the unit it precedes
micro ()
1 million times smaller than the unit it precedes
nano
1000 million times smaller than the unit it precedes
pico (p)
1 trillion times smaller than the unit it precedes
____60.What is the quantity 0.0075 meters expressed in centimeters? Use the table above to help you.
____61.What is the quantity 7896 millimeters expressed in meters? Use the table above to help you.
____62.What is the quantity 987 milligrams expressed in grams? Use the table above to help you.