HESI A2 CHEMISTRY V1/V2 FILE 2023/2024 QUESTIONS AND
ANSWERS
1. If a Hydrogen is in a compound, what would its oxidation number be?
+1
2. What is the oxidation number of any simple ion?
+1 or -1 depending on the charge of the ion
3. How many kilograms are in a pound?
0.453592 kg
4. What is the temperature for freezing point of water in Celsius?
0 degrees Celsius (32°F for Fahrenheit)
5. What is the conversion of Celsius to Fahrenheit?
0°C = 32°F
6. What is the oxidation number of an element atom?
0
7. What is the freezing point of sea water in Fahrenheit?
0°F
8. How many amino acids are in a dipeptide?
2
9. If Oxygen is in a compound, what would its oxidation number be?
-2
10. Which of the following pH values would lemon juice likely have?
2 because the lower the pH value, the more acidic
11. What is a pentose?
A 5 carbon sugar (Pent = 5) (ose = sugar)
12. What is the oxidation state of the Sulfur atom in Sulfuric Acid H SO ?
2 4
6
13. How many neutrons does carbon 14 have?
8 ( mass# - atomics # = neutrons) 14 - 6 = 8
14. How many protons does Potassium have?
19
15. How many amino acids are essential for human life?
20 amino acids
16. Normal body temperature in °C?
37°C
17. Normal body temperature in °F?
98.6°F
18. Boiling point of water in °C?
100°C
19. Boiling point of water in °F?
212°F
20. 0°K is equal to °C? -273°C
21. The term Amphoteric means?
A substance that can act as both a base & acid
22. What is Kelvin based around?
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Absolute zero
23. A compound that is a Hydrogen or proton donor, corrosive to metals, causes blue litmus
paper to become red and becomes less acidic when mixed with a base is?
Acid
24. Mixture of 2 or more metals are?
Alloys
25. Acids:
pH less than 7.0
sour/tart
Formulas begin with H (Hydroge
Proton Donor
26. 3 types of radiation in nuclear chemistry?
Alpha, Beta & Gamma
27. Alpha radiation:
* Emission of Helium (He) ions in the nuclei
* Contains 2 protons & 2 neutrons.
* +2 Charg
* Largest radiation particle.
* Can be stopped by piece of paper
00. Type of Alloy in which another metal is dissolved in Mercury (Hg)?
Amalgam
28. Proteins are made up of?
Amino Acids
29. Glycogen is what kind of starch?
Animal Starch
30. When a electron gains one or more electrons?
Anions
31. Basic building block of a molecule?
Atom (NOT CELL!!)
32. Atomic mass?
Average mass of a elements isotope
33. Atomic #:
# of protons in nucleus of an atom
34. Base?
A Hydrogen or proton ACCEPTOR & has hydroxide group in the makeup of the
molecule
Downloaded by Eric Karimi (karimieric2001@gmail.com)
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Produce -OH
Bitter, slippery, conduct electricity, formulas contain -OH
pH value greater than 7.0
Proton acceptor
35. Key note:
Acids are Proton donors as Bases are proton acceptors
36. Beta radiation:
Decomposition product of a proton or neutron
High speed/energy Electrons
EITHER - charged electrons or + charged positrons
Can be stopped by aluminum foil
37. What is Biochemistry?
Study of substances & processes occurring in living things
38. Fahrenheit is based off of?
Body temperature
39. How does ↑ Surface area speed up chemical reactions?
By ↑ areas of contact where chemical reactions can occur
40. How do catalyst accelerate a chemical reaction?
By reducing the amount of energy needed for a reaction to occur
41. What does COOH symbolize?
A Carboxyl group
42. Which of the following is not a solution type?
Catalyst
43. Define Catalyst.
Substance that speeds up a chemical reaction.
44. What is an atom called when it LOSES 1 or more electrons?
Cations
45. What is chemical bonding?
The joining of atoms to form new substances. 2 types: ionic & covalent bonding
46. What is a Ionic bond?
Electrical attraction between 2 oppositely charged atoms groups of atoms called
ions
(between metals & nonmetals)
47. Ionic bonding?
Chemical bond that’s formed when an atom transfers a electron to another atom.
(steals)
48. Single Covalent bond?
Chemical bond that shares 1 electron pair
Formed by non-metals
49. What are chemical reactions?
Making & breaking of chemical bonds, leading to changes in composition of matter
50. Double Covalent bond?
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