CHEM 1411 CH.1 EXAM QUESTIONS
WITH 100% CORRECT ANSWERS L
LATEST VERSION 2025/2026.
Classify each substance as an element, a compound, a homogeneous mixture, or a
heterogeneous mixture. - ANS
Classify these substances. More than one answer may apply in each case. N2, O2, N20, Air -
ANS N2-pure substance and element
O2-pure substance and element
N20-Compound and pure substance
Air-homogeneous mixture and solution
Which of the following are mixtures?
water, air, salt, salt water - ANS air and salt water
Pure substances can be represented by a single chemical formula. In contrast, mixtures require
multiple chemical formulas to represent their composition.
physical and chemical properties - ANS Physical: Melting/boiling point, color, conductivity
chemical: rust, flammability
Intensive and extensive properties - ANS intensive: boiling/melting point, density,
temperature, color, hardness
independent of the amount of substance present.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
WITH 100% CORRECT ANSWERS L
LATEST VERSION 2025/2026.
Classify each substance as an element, a compound, a homogeneous mixture, or a
heterogeneous mixture. - ANS
Classify these substances. More than one answer may apply in each case. N2, O2, N20, Air -
ANS N2-pure substance and element
O2-pure substance and element
N20-Compound and pure substance
Air-homogeneous mixture and solution
Which of the following are mixtures?
water, air, salt, salt water - ANS air and salt water
Pure substances can be represented by a single chemical formula. In contrast, mixtures require
multiple chemical formulas to represent their composition.
physical and chemical properties - ANS Physical: Melting/boiling point, color, conductivity
chemical: rust, flammability
Intensive and extensive properties - ANS intensive: boiling/melting point, density,
temperature, color, hardness
independent of the amount of substance present.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
