CHEM 121 MODULE 1 EXAM-with 100% verified solutions-2024

CHEM 121 MODULE 1 EXAM-with 100% verified solutions-2024 Mixtures: A) must be heterogeneous B) must be homogenous C) always contain only two substances D) can have variable composition E) must have a definite composition - ANSWERSAnswer: Can have a variable composition most of the elements in the periodic table are classified as: A) nonmetals B) metalloids C) metals D) allotropes E) gases - ANSWERSAnswer: metals how many kg are in 57.0 - ANSWERS5.70 X 10^-8 which of the following is implicated as the most important gas responsible for global warming over the past 100 years A) O2 B) H2O C) CFC's D) CH4 E) CO2 - ANSWERSAnswer: CFC's Alpha Rays are beams of: A)positively charged particles (helium nuclei) B) Electrons C)High energy radiation D)protons E) hydrogen stom - ANSWERSAnswer: High energy radiation which of the following is not an SI base unit: A) s B) m C) K D) mol E) g - ANSWERSAnswer: g Which of the following is not a physical property of methane (CH4)? A) melting point B) combustion reaction with O2 C) volume D) density E) mass - ANSWERSAnswer: B