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Terms in this set (61)
Which of the following of these represents a chemical change?
-boiling water to form steam.
-turning hair yellow with bleach.
-melting butter
-mixing powdered charcoal and oxygen at room temp.
-cutting a bar of sodium metal into pieces w/knife.
turning hair yellow with bleach
Which of these represents a chemical change?
-lard when heated changes to liquid.
-water disappears from a beaker in a few days at room temperature.
-sugar dissolving in water.
-milk turns sour in a few days at room temperature.
-water boils below 100Celsius on a mountain.
milk turns sour in a few days at room temperature
Condensation refers to which
conversion?
-solid -> gas
-solid-> liquid
-gas -> liquid
-gas-> solid
-liquid-> gas
gas-> liquid
Atoms of the same element with different mass numbers are called?
-ions
-neutrons
-allotropes
-chemical families
-isotopes
isotopes
Two isotopes of an element differ only in
their?
-symbol
-atomic number
-number of neutrons
-number of protons
-number of electrons
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
Centi= 1/100 or 10^-2
Milli= /1,000 or 10^-3
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
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