uky chem 103 exam 1 Assessment Questions And Answers 100% Guaranteed Solutions.

scientific notation - correct answer -if the exponent is positive it will be a BIG number -if the exponent is negative it will be a SMALL number length - correct answer meter mass - correct answer kilogram temperature - correct answer kelvin time - correct answer second amount of substance - correct answer mole area - correct answer A m^2 volume - correct answer V m^3 density - correct answer D kg/m^3 concentration - correct answer c mol/L speed(velocity) - correct answer v m/s acceleration - correct answer a m/s^2 force - correct answer F N(newton) energy - correct answer E J(joule) tera - correct answer T 10^12 giga - correct answer G 10^9 mega - correct answer M 10^6 kilo - correct answer k 10^3 deci - correct answer d 10^-1 centi - correct answer c 10^-2 milli - correct answer m 10^-3 micro - correct answer μ or mc 10^-6 nano - correct answer n 10^-9 1 pound = - correct answer 453.6 grams 16 ounces 1 inch = - correct answer 2.54 cm 1 foot = - correct answer 12 inches 1 mile = - correct answer 5280 feet 1.609 km 1 mL= - correct answer 1 cm^3 1 cc 1 gallon = - correct answer 4 quarts 1 liter = - correct answer 1.06 quarts 1 tablespoon = - correct answer 3 teaspoons 1 teaspoon = - correct answer 5 mL 1 calorie = - correct answer 4.184 J 1 atm = - correct answer 760 mmHg = 760 torr convert Fahrenheit to Celsius - correct answer ToC=(ToF−32)×(5/9) convert Celsius to Fahrenheit - correct answer ToF=(9/5)×(ToC)+32 accuracy - correct answer a measure of how close a measurement is to the correct or accepted value of the quantity being measured precision - correct answer is a measure of how close a series of measurements are to one another sig fig rules - correct answer 1. all nonzero digits are significant -237 has 3 sigfigs 2. zeroes between significant figures are significant -2.03 has 3 sigfigs 3. zeros that appear to the left of all of the nonzero digits are called PLACEHOLDER ZEROS and are NOT significant -0.00123 has 3 sigfigs 4. zeros that appear after the last nonzero digit MAY be significant -140 is ambiguous -140. has 3 sigfigs adding and subtracting sigfigs - correct answer the sum or difference is determined by the smallest number of digits to the right of the decimal point in any of the original numbers example: 89.332+1.1=90.432 round to 90.4 because 1.1 has one number after decimal place multiplying and dividing sigfigs - correct answer the number of significant figures in the final product or quotient is equal to the number of significant figures in the starting value that has the fewest significant figures example: 2.8X4.5039=12.61092 round to 13 because 2.8 has the least amount of sigfigs(2) dimensional analysis - correct answer -always start with the simplest unit given -when a problem uses "per" this means there is a relationship -1 goes with the prefix -meaning of the prefix (10^-2) goes with base -make sure answer makes sense -always cancel units percentage problems - correct answer %=part/whole X 100 -read problem carefully to figure out what numbers are what example 29 is 34% of what number? -29 is part -34 is % -trying to find whole 34=29/x X 100 whole=85 *always check answer* atomic number - correct answer is the number of protons in the nucleus of each atom of that element mass number - correct answer defined as the total number of protons and neutrons in an atom how to find the number of protons - correct answer the atomic number located on the periodic table is EQUAL to the number of protons how to find the number of neutrons - correct answer the mass number is equal to the number of protons and neutrons SO mass number - atomic number = # neutrons how to find the number of electrons - correct answer IF NEUTRAL -- the number of electrons is equal to protons ****** if there is a charge, you may have to add or subtract from the number of protons EXAMPLE if there is a 2+ charge, there will be 2 less from the # protons protons - correct answer -symbol: p -charge is positive -relative mass of 1 -located in the nucleus neutrons - correct answer -symbol: n -charge is neutral (0) -relative mass is 1 -located in the nucleus electrons - correct answer -symbol: e -charge is negative -relative mass is 0 -located in rings around the nucleus mass of an atom - correct answer -mainly in the nucleus -you add up the number of protons and neutrons -this can vary because the number of neutrons can vary (protons are ALWAYS the same because they are the atomic number) define isotope - correct answer atoms that have the same atomic number but different mass numbers due to a change in the number of neutrons -the presences of isotopes affects the mass of an atom isotopic symbol of an atom - correct answer -atomic number is subscript -mass number is superscript average atomic mass - correct answer -this is what we see on the periodic table -the weighted average of the atomic masses of the naturally occurring isotopes of that element -each isotope has its own atomic mass -the isotope with the closest atomic mass to the average atomic mass has the highest % natural abundance matter - correct answer -living things are made of matter -anything that occupies space and has mass is known as matter -consists of chemical substances element - correct answer -pure substance that cannot be broken down into different types of substances -each type of element is made up of ONE type of atom -ex: carbon, oxygen, hydrogen -can have ATOMIC or MOLECULAR elements atomic element - correct answer individual atoms of 1 substance single separate atoms molecular element - correct answer 2 atoms that are the same but connected to one another ex: H2 (2 hydrogen, same element) chemical compound - correct answer a pure substance that forms when atoms of 2 or more elements react with one another -unique and fixed chemical composition -atoms of a compound are help together by chemical bonds -can have IONIC or MOLECULAR compounds ionic compounds - correct answer form when electrons are TRANSFERRED from one atom to another and usually form between a metal and nonmetal -same patter molecular compounds - correct answer aka covalent form when atoms SHARE electrons and occur between 2 or more nonmetals -2 separate elements mixture - correct answer -consists of more than one chemical substance -does not have a fixed chemical composition -can be separated into their components by physical methods -can be HOMOgeneous or HETEROgeneous -NOT chemically bonded together homogeneous mixtures - correct answer -a mixture in which the composition is uniform throughout the mixture -a mixture of salt and water is homogenous because the dissolved salt is evenly distributed throughout the entire salt water sample -homo=SAME heterogeneous mixtures - correct answer -a mixture in which the composition is not uniform throughout the mixture -vegetable soup: any given spoonful of soup will contain varying amounts of the different vegetables and other components of the soup -hetero=DIFFERENT metals - correct answer -majority of elements -are elements that are lustrous, or shiny -they are also good conductors of electricity and heat nonmetals - correct answer -fewer than 20 elements are classified as nonmetals -nonmetals lack the properties of metals metalloids - correct answer have properties of both metals and nonmetals define mole - correct answer a counting number used to count small things AVOGADROS# = 6.022X10^23 (atoms/molecules) determine the ratio of elements in a compound from a formula - correct answer 1 carbon 3 hydrogen if there are ( ), distribute the number -- Mg(NO3)2 1 Mg 2 N 6 O (multiply subscripts) determine molar mass of elements/compounds - correct answer -locate the molar mass on the periodic table -if there is a subscript, yo