Foundations of Chemistry

Which practice most directly prevents chemical exposure during a spill in a school lab?

• Wearing closed-toe shoes at all times

• Smelling chemicals to identify them

• Using a fume hood and spill kit

• Neutralizing with bare hands quickly

Which statement best distinguishes pure chemistry from applied chemistry?

• Pure solves industry problems; applied theorizes

• Pure seeks knowledge; applied uses knowledge

• Pure is only organic; applied is physical

• Pure requires products; applied forbids applications

A scientist investigates reactions of carbon-based molecules. Which branch most closely describes their field?

• Physical chemistry research

• Organic chemistry research

• Analytical chemistry research

• Biochemistry research

What is the primary advantage of SI units in scientific measurement?

• They avoid using prefixes or conversions

• They are easier to memorize than English

• They provide uniform standards globally

• They are culturally familiar worldwide

Match each SI base unit with its correct pairing.

• Which pairing incorrectly matches the SI base unit for temperature?

• Mass—kilogram; temperature—kelvin

• Which pairing incorrectly matches the SI base unit for time?

• Amount—mole; temperature—degree

• Which pairing correctly matches both SI base units for mass and temperature?

• Current—ampere; mass—gram

• Which pairing incorrectly matches the SI base unit for mass?

• Length—meter; time—minute

Which statement about the Kelvin temperature scale is accurate for scientific work?

• Kelvin uses degrees like Celsius

• Kelvin equals Fahrenheit at freezing

• Kelvin forbids temperature conversions

• Kelvin starts at absolute zero

A thermometer reads 25 °C. Which value represents the same temperature in kelvins?

• 298 K

• 248 K

• 310 K

• 273 K

If the air temperature is 37°C, what is the equivalent temperature in Kelvin? Use T(K)=T(°C)+273.

• -236 K

• 0 K

• 310 K

• 236 K

Which step typically comes immediately after forming a hypothesis in the scientific method?

• Share conclusions

• Analyze data

• Design an experiment

• Identify a problem

Match each property type with its correct example.

• An extensive property that depends on the amount of substance

• Density of a material

• An intensive property that does not depend on the amount of substance

• Mass of a sample

• An extensive property that measures the quantity of matter

• Total energy content

• An extensive property related to the total energy present

• Volume of a sample