Periodic Table and Elements
Which group of elements (Group 18) is naturally inert, stable, and generally does not form ions naturally?
What are the noble gases?
What type of chemical compound contains only hydrogen and carbon atoms?
What is a hydrocarbon?
What is the IUPAC root name for an alkane containing a straight chain of 3 carbon atoms?
What is propane?
What type of observation involves non-numerical descriptions of macroscopic properties, such as color changes or precipitate formation?
What is a qualitative observation?
Which gas makes up the largest percentage (approximately 78%) of Earth's atmospheric air by volume?
What is nitrogen?
How are the elements ordered in the modern periodic table, a arrangement based on the work of Henry Moseley?
What is by increasing atomic number?
What physical separation technique is used to separate crude oil into different hydrocarbon fractions based on their boiling points?
What is fractional distillation?
What functional group (symbolized as -OH) characterizes the class of organic compounds known as alcohols?
What is the hydroxyl group?
Collecting numerical measurement data (such as mass, volume, or temperature) during an experiment is what type of observation?
What is a quantitative observation?
What primary greenhouse gas, produced by respiration and fossil fuel combustion, exceeded a global threshold concentration of 400 ppm around 2015?
What is carbon dioxide
Contrast the general physical properties of metals and non-metals regarding electrical conductivity, malleability, and density.
What is: metals are good conductors, malleable, and typically have high densities; whereas non-metals are poor conductors (insulators), brittle, and generally have low densities?
What industrial process breaks down large, long-chain hydrocarbon molecules into smaller, more useful alkanes and alkenes?
What is catalytic cracking?
What is the general molecular formula for the alkane family, where n represents the number of carbon atoms?
What is Cn+H2n+2
What type of reasoning moves from specific experimental observations to broad, general conclusions or theories?
What is inductive reasoning?
What chemical test can be used to distinguish an unsaturated alkene from a saturated alkane by observing a color change from orange-brown to colorless?
What is the bromine water test
What is the term for elements in Groups 3 through 12 that characteristically form colorful compounds and can act as catalysts?
What are transition metals (or transition elements)?
In a fractionating column, where do short-chain hydrocarbons collect compared to long-chain hydrocarbons, and why?
What is at the top of the column, because they have lower boiling points and are more volatile?
Distinguish between saturated and unsaturated hydrocarbons in terms of carbon-carbon bonding and chemical reactivity.
What is: saturated hydrocarbons (alkanes) contain only single C-C bonds and are less reactive, while unsaturated hydrocarbons (alkenes) contain at least one double C=C bond and are more reactive?
Why can a scientific hypothesis never be strictly "proven," only supported or disproven?
What is because future evidence, new observations, or advances in testing technology could always potentially contradict or refine the hypothesis?
How do trapped air bubbles inside ancient glacial ice cores provide scientists with evidence about Earth's climate history?
What is by preserving samples of past atmospheric composition, temperature markers, and historical greenhouse gas levels?
How does effective nuclear charge change across a period from left to right, and what effect does this trend have on atomic radius?
What is: effective nuclear charge increases across a period due to the addition of protons without adding new electron shells, pulling valence electrons closer and decreasing the atomic radius?
How do intermolecular forces (specifically London dispersion forces) change as hydrocarbon chain length increases, and how does this affect viscosity and flammability?
What is: as chain length increases, intermolecular forces become stronger, which increases viscosity (thicker liquid) and decreases flammability?
What structural feature is required for structural isomers to exist, and how do structural isomers differ in their physical properties?
What is: structural isomers must have the same molecular formula but different bonding connectivity, which results in different physical properties such as different boiling points?
How do systematic errors differ from random errors in experimental chemistry, and which type affects measurement accuracy rather than precision?
What is: systematic errors consistently shift measurements in one direction (affecting accuracy), while random errors cause unpredictable fluctuations around a mean value (affecting precision)?
Explain the mechanism of the enhanced greenhouse effect by identifying the wavelength region of incoming solar radiation versus outgoing terrestrial radiation re-absorbed by greenhouse gases.
short-wavelength ultraviolet/visible solar radiation passes through the atmosphere to heat Earth's surface, which re-radiates it as long-wavelength infrared radiation that greenhouse gases absorb and re-emit back toward Earth?