Chemistry Exam 111
Chemistry the study of composition, structures, properties, and reactions of matter
matter anything that has mass and takes up space
Chemical a substance that always has the same composition and properties wherever it is
found
Convert 45,000 to scientific notation 4.5 x 10^4
Convert 3,750 to scientific notation 3.75 x 10^3
Convert 580,000 to scientific notation 5.8 x 10^5
Positive exponents in scientific notation are always large
associated with a _____ number
Negative exponents in scientific notion are always small
associated with a _____ number
If you move the decimal to the _____, it gets a negative right
exponent
If you move the decimal to the _____ , it gets a positive left
exponent
Convert 0.023 to scientific notation. 2.3 x 10^-3
Convert 4.27 x 10^5 to standard form 427,000
Convert 3.96 x 10^7 to standard form 39,600,000
What is a number a mathematical concept used to decide a quantity
What is an exact number? a number with a value that is exactly known; NO estimation: infinite number of sig
figs
, Chemistry Exam 111
What are measured numbers? Numbers with a value that is NOT exactly known due to the measuring process;
SOME estimation
Example of an exact number? 17 eggs, 12 students. Anything that can be counted
Example of a measured number? 1.95 cm, 128lb, 45 F. Anything that can be measured.
What are trailing zeros? any zero to the right of the last non-zero digit with a decimal place
example of trailing zeros 4.130 , 3.2220000 , 15.00
What are captive zeros? any zero between two non-zero digits. no decimal place is needed
Examples of captive zeros 4.022 , 3006, 15.890201
What are leading zeros? any zero to the left of the first non zero digit.
Are leading zeros significant? No, never
Examples of leading zeros? 0.082 , 0.000222 ,0.890201
What are zeros with decimals? These essentially become trailing zeros and they are significant
Examples of zeros with decimals? 550.00 , 44000. , 32.0
True or false: When you have an ambiguous number it True
must be written in scientific form
What are ambiguous zeros? They are measured numbers greater than one that end in zeros without a decimal
Examples of ambiguous zeros. 20, 5500, 330022000
Chemistry the study of composition, structures, properties, and reactions of matter
matter anything that has mass and takes up space
Chemical a substance that always has the same composition and properties wherever it is
found
Convert 45,000 to scientific notation 4.5 x 10^4
Convert 3,750 to scientific notation 3.75 x 10^3
Convert 580,000 to scientific notation 5.8 x 10^5
Positive exponents in scientific notation are always large
associated with a _____ number
Negative exponents in scientific notion are always small
associated with a _____ number
If you move the decimal to the _____, it gets a negative right
exponent
If you move the decimal to the _____ , it gets a positive left
exponent
Convert 0.023 to scientific notation. 2.3 x 10^-3
Convert 4.27 x 10^5 to standard form 427,000
Convert 3.96 x 10^7 to standard form 39,600,000
What is a number a mathematical concept used to decide a quantity
What is an exact number? a number with a value that is exactly known; NO estimation: infinite number of sig
figs
, Chemistry Exam 111
What are measured numbers? Numbers with a value that is NOT exactly known due to the measuring process;
SOME estimation
Example of an exact number? 17 eggs, 12 students. Anything that can be counted
Example of a measured number? 1.95 cm, 128lb, 45 F. Anything that can be measured.
What are trailing zeros? any zero to the right of the last non-zero digit with a decimal place
example of trailing zeros 4.130 , 3.2220000 , 15.00
What are captive zeros? any zero between two non-zero digits. no decimal place is needed
Examples of captive zeros 4.022 , 3006, 15.890201
What are leading zeros? any zero to the left of the first non zero digit.
Are leading zeros significant? No, never
Examples of leading zeros? 0.082 , 0.000222 ,0.890201
What are zeros with decimals? These essentially become trailing zeros and they are significant
Examples of zeros with decimals? 550.00 , 44000. , 32.0
True or false: When you have an ambiguous number it True
must be written in scientific form
What are ambiguous zeros? They are measured numbers greater than one that end in zeros without a decimal
Examples of ambiguous zeros. 20, 5500, 330022000
