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Terms in this set (61)Which of the following of these represents a chemical change? turning hair yellow with bleach Which of these represents a chemical change? milk turns sour in a few days at room temperature Condensation refers to which
conversion? gas-> liquid Atoms of the same element with different mass numbers are called? isotopes Two isotopes of an element differ only in
their? number of neutrons T/F: Qualitative refers to definite numbers, not qualities such as color. FALSE T/F: Precision is a comparison of a measured value to the true value. FALSE T/F: Accuracy is a measure of the range (closeness) of a repetitive measurements. FALSE T/F: Water is an example of an element. FALSE T/F: In most chemical reactions, atoms are neither created nor destroyed. TRUE T/F: When referring to an atom's structure, electrons are in the nucleus and protons/neutrons represent a diffuse "cloud" and surround the nucleus. FALSE T/F: Electrons don't change chemical re-activity much, but can greatly effect an isotope's radioactivity. FALSE T/F: Two different compounds can have the same empirical formula but different molecular formulas. TRUE T/F: Organic compounds usually contain carbon and hydrogen. TRUE T/F: A cation is positively charges, and an anion is negatively charged. TRUE T/F: Propane contains four carbons. FALSE T/F: Ethanol is toxic to humans at all doses, while methanol and propanol are toxic at relatively high doses. FALSE T/F: A mole of the carbon isotope, carbon-12, has a weight of exactly 12.00g/mol. TRUE The SI prefixes of kilo, centi, and milli: Kilo=
1,000 T/F: An empirical formula and molecular formula can be the same. TRUE T/F: An empirical formula contains important bonding (connectivity) information. FALSE T/F: Most reaction yields are 100% or less
TRUE T/F: The percent yield of a reaction is usually less than the theoretical yield. TRUE T/F: The precipitation process involves a solid forming from a previously clear solution. TRUE T/F: A base is a proton donor & an acid is a proton acceptor. FALSE T/F: An acid usually contains an H atom. TRUE T/F: Oxidation is the loss of electrons, while reduction has a gain of electrons. TRUE T/F: A redox reaction can produce electrons that can be subsequently stored for future use. FALSE T/F: A mole of people is a greater number than a mole of H atoms. FALSE T/F: In chemical nomenclature, the state denoted as (aq) is defined as dissolved in water. TRUE T/F: Pure water is a good conductor of electricity. FALSE T/F The ideal gas law does not accurately calculate the experimentally confirmed, gas parameters (T,P,V) for all gases at all conditions. TRUE T/F: In a sample of a gas, all molecules have the same kinetic energy at a given temperature. FALSE T/F: Total energy of the universe is constant, but energy is converted from one form to another. TRUE T/F: If you were to drop a stationary ball, kinetic energy would increase while potential energy decreased. TRUE T/F: If a battery is discharged thru an electrical resistance coil, it loses most of its energy thru work performed on its surroundings. FALSE T/F: The burning of a hydrogen gas flame represents the conversion of chemical energy to thermal energy. TRUE T/F: In a bomb calorimeter, the combustion reaction occurs in an excess of oxygen. TRUE T/F: A food calorie is equivalent to 1000 true energy calories. TRUE T/F: In general for a human, digesting a gram of carbohydrate yields more calories than a gram of fat. FALSE T/F: Theoretically, in a bomb calorimeter, the calorimeter absorbs all the energy that the reaction releases. TRUE T/F: ΔH is a state function, but q and are not state functions. TRUE T/F: The most stable form of an element is assigned a ΔH° of 0.0 kj. TRUE T/F: If two solutions (acid and a base) are mixed and the resulting solution warns, this represents an endothermic reaction. FALSE T/F: For a bomb calorimeter, the Qrxn (reaction) is always zero or positive. FALSE T/F: All wavelengths of lights in the electromagnetic spectrum have different energy. TRUE T/F: The exact location of an electron in an oribital cannot be determined at any given time. TRUE
T/F: The last quantum number, the spin quantum number, can have values of 0 to n-1. FALSE T/F: Comparatively, the ionization energy of Na is higher than of Cl. TRUE T/F: A Na (sodium) atom is smaller than a K (potassium) atom. TRUE T/F: In covalent bonding, electrons are shared between nuclei. TRUE T/F: In general atoms seek to achieve an electron configuration similar to the noble gases. TRUE T/F: In general, lattice energy and melting point have an inverse correlation. FALSE T/F: Lattice energy is dependent of atomic charge and distance between ions. TRUE T/F: Ionic compounds generally have much higher melting points than covalent compounds. TRUE T/F: Covalent compounds are generally more soluble in water than ionic compounds. FALSE
T/F: In general, as quantum number n increase or electron orbitals, average distance of the orbital from the nucleus also increases. TRUE T/F: A -orbital contains up to a maximum of 12 electrons. FALSE T/F: An element or compound containing an unpaired electron is paramagnetic. TRUE T/F: Ionic compounds are more soluble in non polar organic solvents. FALSE T/F: Two electrons in an orbital have exactly the same four quantum numbers. FALSE Sets with similar termsChemistry Definitions92 terms stc15PaulM Chemistry Regents Vocab65 terms Isabelle_Rubbo46 11th Grade Chemistry Vocabulary75 terms Kaitlin_Kelley5 Chemistry Regents review58 terms diavionnewaithe2021 Sets found in the same folderStraighterline CHEM101 Final314 terms brookehoffler Chemistry Final110 terms ambruflat23PLUS Chemistry 107 final exam106 terms pgabby8090 Chapter 23125 terms jasminefevan Other sets by this creatorBiology30 terms ashtonmburke Mental Health Drugs48 terms ashtonmburke A&K Test #340 terms ashtonmburke Patient Care Test 12 terms ashtonmburke Verified questionsCHEMISTRY Give systematic names for the following formulas: (a) [Ni(H2O)6]Cl2 (b) [Cr(en)3](C1O4)3 (c) K4[Mn(CN)6] Verified answer
CHEMISTRY Explain the theory behind carbon-14 dating. What assumptions must be made and what problems arise when using carbon-14 dating? Verified answer
PHYSICAL SCIENCE How much energy would be absorbed by 550 g of copper when it is heated from $24^{\circ} \mathrm{C}$ to $45^{\circ} \mathrm{C}$? Verified answer
CHEMISTRY A bedroom has a volume of 115 $m^3$. What is its volume in each unit? a. $km^3$ b. $dm^3$ c. $cm^3$ Verified answer Recommended textbook solutions
Organic Chemistry3rd EditionDavid Klein 2,990 solutions Chemical Reaction Engineering3rd EditionOctave Levenspiel 228 solutions Quantitative Chemical Analysis8th EditionDaniel C. Harris 921 solutions Atkins Physical Chemistry10th EditionJulio de Paula, Peter Atkins 1,315 solutions Other Quizlet setsNutrition Chpt. 8 Metabolism38 terms lucky13BOI Teacher Interview47 terms taraeliser CDL set 244 terms Myetha20 Poverty10 terms jjfkingTEACHER Related questionsQUESTION At which electrode would Zn2+ (aq) turn into Zn (s)? 2 answers QUESTION what does the atomic mass and the atomic number tell us 15 answers QUESTION What is the aqueous solution colour of bromine? 8 answers QUESTION What is the significance of buffers? 15 answers Which of these represent a chemical change?Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.
Which change is a chemical change quizlet?Chemical changes involves the production of an entirely new substance through breaking and rearranging atoms. Physical changes are usually reversible and do not involve the creation of different elements or compounds.
Which one of these represents a chemical change boiling water to form steam?The boiling of water to form steam is a physical change because the vapors formed can be converted into the water on cooling.
Which one of the following represents a chemical property?Examples of chemical properties include flammability, toxicity, acidity, reactivity (many types), and heat of combustion.
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Which one of these represents a chemical change Quizlet
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