CHEM 120 (chem120)

An object has a mass of 7.748 g and a volume of 5.6 mL. What is its density? Give your answer to the nearest tenths place correct answer: 1.4 g/mL An object has a mass of 12.876 g and a density of 1.5 g/mL. What is its volume? Give your answer to the tenths place correct answer: 8.6 mL An object has a volume of 3.8 mL and a density of 6.3 g/mL. What is its mass? Give your answer to the ones place (for example 21) correct answer: 24 g An object has a mass of 40.517 g and a density of ...

scientific notation correct answer: 3.94 x 10⁷= 0. = 8.0 x 10⁻⁶ measured v. exact numbers correct answer: measured = obtained through measurement and are uncertain exact = obtained through counting and are certain precision v. accuracy correct answer: precision = close to each other accuracy = close to the actual number conversion factor correct answer: a ratio of equivalent measurements used to convert a quantity from one unit to another density correct answer: d = m/...

Fahrenheit - 1.8(C) + 32 Celsius - (F-32)/1.8 Physical property - properties can be observed without changing the identity of the substance under observation Chemical property - properties can only be observed during a change int he identity of the substance under observation examples of chemical properties - corrosive, combustible, mutagenic, teratogenic, explosive examples of physical properties - size, malleability, ductility, conductivity, density, state of matter Homogenou...

Chemistry correct answer: The study of matter and the changes it undergoes Matter correct answer: Anything that has mass and occupies space Element correct answer: Basic material that can NOT be broken down into simpler substance What is matter made up of? correct answer: Atoms and Molecules Density of water correct answer: 1.00g/mL 1 kg = ? lbs correct answer: 2.205 lb 1 meter = ? in correct answer: 39.37 in 1 in = ? cm correct answer: 2.54 cm Precision correct a...

Hypothesis correct answer: a testable educated guess Experiment correct answer: how we test hypotheses Variable correct answer: Idea to be tested (only one) Control correct answer: Something the variable is tested against Experimental protocol correct answer: How do you do the test? Results correct answer: Data generated comparing variable to controls. Includes statistics to show results are meaningful Conclusion correct answer: Interpretation of results independent v...

Saturated correct answer: alkane Unsaturated correct answer: alkenes and alkynes CH3CH2CH2CH2CH3 correct answer: Pentane C2H6 correct answer: Ethane what are your terminal carbons correct answer: CH3 CH3-CH2-CH3 | CH3 correct answer: 2-methyl-propane T or F: the branch needs to have to lowest number possible correct answer: true CH3-CH2-CH2-CH3 | CH3 correct answer: 2-methyl- butane Alcohol correct answer: ROH what is an example of alcohol correct answ...

Polyatomic ions correct answer: ions that are made of more than one atom Nitrate correct answer: NO3- Nitrite correct answer: NO2- bicarbonate (hydrogen carbonate) correct answer: HCO3- Sulfate correct answer: SO4 2- Sulfite correct answer: SO3 2- Carbonate correct answer: CO3 2- cyanide correct answer: CN- Hydroxide correct answer: OH- Phosphate correct answer: PO4 3- Ammonium correct answer: NH4+ Ionic compounds correct answer: - crystalline solid ...

what is the formula for ionic compound correct answer: Xm+ Yn-= XnYm name the ionic compound Na+ I- correct answer: NaI name the ionic compound Ba2+ O2- correct answer: BaO Name ionic compounds Mg2+ N-3 correct answer: Cross multiply Mg3N2 (numbers are subscript) What is an ionic compound correct answer: metal and nonmetal How do you name ionic compounds? correct answer: Name the metal ion (first one), then name non-metal ion and end element with suffix "ide" polytonic ...

ionic compounds correct answer: -deals with charged particles -oppositely charged particles are attracted to each other -look for presence of metals and polyatomic ions molecular compounds correct answer: -share electrons -nonmetals -no polyatomic ions unless its an acid Type I metals correct answer: -ionic compounds -group 1A,2A,3A -one type of charge state -Name of metal +ion -if metal+nonmetal: name of metal+base name of nonmetal +ide -if metal+polyatomic ion: name of meta...

What is the correct order of melting points for the following alkanes, from highest to lowest temperature? correct answer: heptane > hexane > ethane > methane 2. Given an alkane that contains 25 carbon atoms. How many hydrogen atoms are present in its structure? a) correct answer: ) 52 3. Which of the following properly describes constitutional (structural) isomers? correct answer: compounds with the same molecular formula, but a different order of attachment of atoms 4. How...