CHEMISTRY D425 (WGU OA) EXAM | 2025 LATEST UPDATED| COMPLETE
QUESTIONS AND ANSWERS | 100% RATED CORRECT | 100% VERFIED |
ALREADY GRADED A+|GET A+
1. How is matter classified?: pure substances and mixtures
2. Avogadro's number: number of representative particles in a mole, 6.02 X
10^23 3. Words like atom, particles, molecules, formula units mean?: use
Avogadro's number 6.02x10^23
4. Imperial System: the system of measurement used in the United States 5.
What is an element?: A substance that cannot be broken down into simpler
substances
6. What is an compound?: pure substance that contains more than one
element and can be broken down into chemically simpler components
7. What is a mixture?: is a physical blend of two or more pure substances
where each retains its own identity and properties in the mixture 8. What are the
three phases of matter?: solid, liquid, gas
9. What is matter composed of?: atoms
10. How is energy transferred?: heat and work
, 11. What is the motion of energy?: kinetic energy
12. what is resting energy?: potential energy
13. What is a molecule ?: a group of two or more atoms held together by
chemical bonds
14. Is matter affected by physical changes?: physical changes DO NOT alter
the composition of matter
15. Is matter affected by chemical changes ?: Chemical changes transform
matter in such a way that the identity or chemical substance changes
16. matter can neither be created nor destroyed: What is the law of
conservation of mass?
17. bonding electron pair: two electrons shared between atoms
18. What are core electrons?: inner electrons core shell
19. What are colvalent bonds?: bond formed by the sharing of electrons
between nonmetals
example: H2O, NH3
20. valance electrons: electrons in the outermost shell
21. noble gases: the elements in Group 8A of the periodic table
QUESTIONS AND ANSWERS | 100% RATED CORRECT | 100% VERFIED |
ALREADY GRADED A+|GET A+
1. How is matter classified?: pure substances and mixtures
2. Avogadro's number: number of representative particles in a mole, 6.02 X
10^23 3. Words like atom, particles, molecules, formula units mean?: use
Avogadro's number 6.02x10^23
4. Imperial System: the system of measurement used in the United States 5.
What is an element?: A substance that cannot be broken down into simpler
substances
6. What is an compound?: pure substance that contains more than one
element and can be broken down into chemically simpler components
7. What is a mixture?: is a physical blend of two or more pure substances
where each retains its own identity and properties in the mixture 8. What are the
three phases of matter?: solid, liquid, gas
9. What is matter composed of?: atoms
10. How is energy transferred?: heat and work
, 11. What is the motion of energy?: kinetic energy
12. what is resting energy?: potential energy
13. What is a molecule ?: a group of two or more atoms held together by
chemical bonds
14. Is matter affected by physical changes?: physical changes DO NOT alter
the composition of matter
15. Is matter affected by chemical changes ?: Chemical changes transform
matter in such a way that the identity or chemical substance changes
16. matter can neither be created nor destroyed: What is the law of
conservation of mass?
17. bonding electron pair: two electrons shared between atoms
18. What are core electrons?: inner electrons core shell
19. What are colvalent bonds?: bond formed by the sharing of electrons
between nonmetals
example: H2O, NH3
20. valance electrons: electrons in the outermost shell
21. noble gases: the elements in Group 8A of the periodic table
