CHEM 1411 EXAM QUESTIONS WITH
100% CORRECT ANSWERS L LATEST
VERSION 2025/2026.
1. This is a physical combination of two or more pure substances, that has visibly
indistinguishable parts. - ANS homogeneous mixture
2. This is a physical combination of two or more pure substances, that has visibly distinguishable
parts. - ANS D. a heterogeneous mixture
3. This is a substance that has one constant composition, but can be decomposed chemically -
ANS compound
4. This is a substance that cannot be decomposed into simpler substances by chemical or
physical means. - ANS an element
5. What is 345.009 g - 23.009 g? - ANS d. 322.000 g
6. Using a metric ruler, you find the sides of a rectangular piece of plywood are 3.54 cm and
4.85 You calculate that the area is 17.1690 cm2. To the correct number of significant figures, the
result should be expressed as - ANS d. 17.2 cm2
7. Three samples of 0.12 g, 1.8 g, and 0.562 g are mixed together. The combined mass of all
three samples, would be correctly recorded as - ANS 2.5 g
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,8. The dimensions of a rectangular solid are measured to be 1.27 cm, 1.3 cm, and 2.5 cm. The
volume should be recorded as - ANS 4.1 cm3
9. The sum of 314.53 km and 32 km is correctly expressed as - ANS 347 km
When Alex measures these seeds with this metric ruler, the first decimal place that is uncertain
is - ANS hundredths of a centimeter
12. Which of the following is a chemical property of zinc? - ANS Zinc reacts slowly with
oxygen to form zinc oxide.
13. A physical property may be investigated by - ANS melting ice.
14. A physical change occurs when a - ANS glue gun melts a glue stick.
15. Which of these is a compound ? - ANS Fe2O3
16. Lead has a density of 11.3 g/cm2. What is the volume of a block of lead with a mass of 282.5
g? - ANS 25 cm3
17. This is a process of separating the components of a mixture based on differences in the
boiling point of the components: - ANS Distillation
18. This is the process of separating a mixture by passing it through a substance that allows one
component to pass but not another: - ANS b. Filtration
19. The Gold Foil Experiment performed by Rutherford - ANS led to the discovery of the
nucleus.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, 20. Cathode rays are deflected away from a negatively charged plate because - ANS they are
negatively charged particles
21. Cathode ray tube experiments provided the frst evidence of - ANS subatomic particles
22. All atoms of a given element have the same - ANS number of protons
23. Which atom has the largest number of neutrons? - ANS Argon-41
There are ____ electrons, ____ protons, and ____ neutrons in an atom of 132 Xe - ANS 54,
54, 78
26. In the symbol shown below , x =
13
C
X - ANS B. 6
Which pair of atoms constitutes a pair of isotopes of the same element? - ANS 14 12
XX
66
27. Which pair of elements would you expect to exhibit the greatest similarity in their physical
and chemical properties? - ANS Ca, Sr
Elements in Group 17 (7A) are known as the - ANS E. halogens
29. Which one of the following is most likely to lose electrons when forming ion? - ANS A. Rh
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
100% CORRECT ANSWERS L LATEST
VERSION 2025/2026.
1. This is a physical combination of two or more pure substances, that has visibly
indistinguishable parts. - ANS homogeneous mixture
2. This is a physical combination of two or more pure substances, that has visibly distinguishable
parts. - ANS D. a heterogeneous mixture
3. This is a substance that has one constant composition, but can be decomposed chemically -
ANS compound
4. This is a substance that cannot be decomposed into simpler substances by chemical or
physical means. - ANS an element
5. What is 345.009 g - 23.009 g? - ANS d. 322.000 g
6. Using a metric ruler, you find the sides of a rectangular piece of plywood are 3.54 cm and
4.85 You calculate that the area is 17.1690 cm2. To the correct number of significant figures, the
result should be expressed as - ANS d. 17.2 cm2
7. Three samples of 0.12 g, 1.8 g, and 0.562 g are mixed together. The combined mass of all
three samples, would be correctly recorded as - ANS 2.5 g
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,8. The dimensions of a rectangular solid are measured to be 1.27 cm, 1.3 cm, and 2.5 cm. The
volume should be recorded as - ANS 4.1 cm3
9. The sum of 314.53 km and 32 km is correctly expressed as - ANS 347 km
When Alex measures these seeds with this metric ruler, the first decimal place that is uncertain
is - ANS hundredths of a centimeter
12. Which of the following is a chemical property of zinc? - ANS Zinc reacts slowly with
oxygen to form zinc oxide.
13. A physical property may be investigated by - ANS melting ice.
14. A physical change occurs when a - ANS glue gun melts a glue stick.
15. Which of these is a compound ? - ANS Fe2O3
16. Lead has a density of 11.3 g/cm2. What is the volume of a block of lead with a mass of 282.5
g? - ANS 25 cm3
17. This is a process of separating the components of a mixture based on differences in the
boiling point of the components: - ANS Distillation
18. This is the process of separating a mixture by passing it through a substance that allows one
component to pass but not another: - ANS b. Filtration
19. The Gold Foil Experiment performed by Rutherford - ANS led to the discovery of the
nucleus.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, 20. Cathode rays are deflected away from a negatively charged plate because - ANS they are
negatively charged particles
21. Cathode ray tube experiments provided the frst evidence of - ANS subatomic particles
22. All atoms of a given element have the same - ANS number of protons
23. Which atom has the largest number of neutrons? - ANS Argon-41
There are ____ electrons, ____ protons, and ____ neutrons in an atom of 132 Xe - ANS 54,
54, 78
26. In the symbol shown below , x =
13
C
X - ANS B. 6
Which pair of atoms constitutes a pair of isotopes of the same element? - ANS 14 12
XX
66
27. Which pair of elements would you expect to exhibit the greatest similarity in their physical
and chemical properties? - ANS Ca, Sr
Elements in Group 17 (7A) are known as the - ANS E. halogens
29. Which one of the following is most likely to lose electrons when forming ion? - ANS A. Rh
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
