Diatomic elements - Study guides, Class notes & Summaries
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HESI A2 CHEMISTRY 2023- 2024 ALL 25 QUESTIONS WITH ANSWERS AND RATIONALES LATEST UPDATES 100% VERIFIED ANSWERS WITH EXPLANATION.
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HESI A2 CHEMISTRY 2023- 
2024 ALL 25 QUESTIONS 
WITH ANSWERS AND 
RATIONALES LATEST UPDATES 100% 
VERIFIED ANSWERS WITH EXPLANATION. 
1. Which of the following substances allows for the fastest diffusion? 
A. gas 
B. solid 
C. liquid 
D. plasma 
Explanation: Diffusion is fastest through gases. The next fastest medium for diffusion is liquid, 
followed by plasma, and then solids. In chemistry, diffusion is defined as the movement of 
matter by the random motions of molecules. In a gas or...
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Chemistry Exam 1 Practice Questions With 100% Verified Answers
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Chemistry Exam 1 Practice Questions With 
100% Verified Answers 
_____ do not form Ions - answerNoble Gases 
A tentative explanation to an observation is a _______ - answerHypothesis 
The metric unit for volume is - answercubic meter (m^3) 
The metric unit for density is - answerkg/m^3 
The conversion factor for meters to micrometers is - answer10^6 micrometers/1m 
1m = ____ cm? - answer100 cm 
Matter is - answermade up of atoms and molecules 
An element is - answera single type of atom 
A molec...
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General Chemistry placement test Study Guide 2024 Solved 100%
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Atomic Number - The number of protons in the nucleus of an atom. The atomic number of an element never changes, meaning that the number of protons in the nucleus of every atom in an element is always the same. 
Hydrogen = 1, Carbon = 6, Oxygen = 8 (located on top of element of periodic table) 
 
Mass Number - # of neurons + # of protons = mass number (located on bottom of periodic table) 
 
Isotopes - Let's say an atom is missing a neutron or has an extra neutron. That type of at...
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Cambridge IGCSE Chemistry UPDATED Exam Questions and CORRECT Answers
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Alkali metals - Elements in the first group of the periodic table; very reactive with 
group 7 elements; reactivity increases going down the group 
Halogens - Elements in the seventh group of the periodic table; diatomic elements; very 
reactive with group one elements; reactivity increases going up the group 
Sublimation - A change directly from the solid to the gaseous state without becoming 
liquid 
Deposition - Change from a gaseous state directly to a solid 
Element - A pure substance ma...
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HESI A2 Chemistry Questions with Answers and Explanations UPDATED
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HESI A2 Chemistry Questions with 
Answers and Explanations 
UPDATED 
1. Which of the following substances allows for the fastest diffusion? 
A. gas 
B. solid 
C. liquid 
D. plasma 
Explanation: Diffusion is fastest through gases. The next fastest medium for diffusion is liquid, 
followed by plasma, and then solids. In chemistry, diffusion is defined as the movement of 
matter by the random motions of molecules. In a gas or a liquid, the molecules are in perpetual 
motion. For instance, in a quan...
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Chemistry Final Exam (Answered)
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Chemistry Final Exam (Answered) 
 
Oxidation Rules 
Rule 1: The oxidation number of an element in its free state = 0 (Also true for diatomic elements) 
-Mg=0,H2=0, C=0 
 
Rule 2: The oxidation number of a monatomic (one-atom) ion is the same as the charge on the ion 
-Mg^2+=+2, Na^+=+1, O^2-=-2 
 
Rule 3: The sum of all oxidation numbers in a neutral compound is zero. The sum of all oxidation numbers in a polyatomic (many-atom) ion is equal to the charge on the ion. 
 
Rule 4: The oxidation numb...
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SAMPLE CHEMISTRY PLACEMENT EXAM QUESTIONS WITH COMPLETE SOLUTIONS 100% 2023/2024
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SAMPLE CHEMISTRY PLACEMENT EXAM QUESTIONS WITH COMPLETE SOLUTIONS 100% 2023/2024 
Answer: Oxygen 
Aluminum forms a +3 ion. In order for the formula unit Al₂X₃ to be electrically neutral, the element X must form a -2 ion. Nonmetals in the oxygen column do this. Of these elements, only oxygen is a diatomic gas. 
Aluminum reacts with element X to form a compound with the formula A₂X₃. Element X exists as diatomic molecules, X₂, in the gaseous state at normal temperature and pressure. Elem...
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Chemistry 121 Exam 1 Questions and Answers 100% Correct
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Chemistry 121 Exam 1 Questions and 
Answers 100% Correct 
What are the three states of matter? - Correct Answer ️️ -solid, liquid and gas 
___ is the study of properties and behavior of matter. - Correct Answer ️️ -chemistry 
___ is the physical material of the universe. It is also anything the has mass and 
occupies space. - Correct Answer ️️ -matter 
__ is matter that is made up of one "thing" - Correct Answer ️️ -pure substance 
__ is a mixture that doesn't have the same co...
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Sample Chemistry Placement Exam Questions and Answers 2024/2025
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Sample Chemistry Placement Exam Questions and Answers 2024/2025 
 
 
Answer: Oxygen 
Aluminum forms a +3 ion. In order for the formula unit Al₂X₃ to be electrically neutral, the element X must form a -2 ion. Nonmetals in the oxygen column do this. Of these elements, only oxygen is a diatomic gas. 
Aluminum reacts with element X to form a compound with the formula A₂X₃. Element X exists as diatomic molecules, X₂, in the gaseous state at normal temperature and pressure. Element 
X must b...
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HESI A2 CHEMISTRY 2023- 2024 ALL 25 QUESTIONS WITH ANSWERS AND RATIONALES LATEST UPDATES 100% VERIFIED ANSWERS WITH EXPLANATION.
- Exam (elaborations) • 14 pages • 2024
- Available in package deal
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- $13.99
- + learn more
HESI A2 CHEMISTRY 2023- 
2024 ALL 25 QUESTIONS 
WITH ANSWERS AND 
RATIONALES LATEST UPDATES 100% 
VERIFIED ANSWERS WITH EXPLANATION. 
1. Which of the following substances allows for the fastest diffusion? 
A. gas 
B. solid 
C. liquid 
D. plasma 
Explanation: Diffusion is fastest through gases. The next fastest medium for diffusion is liquid, 
followed by plasma, and then solids. In chemistry, diffusion is defined as the movement of 
matter by the random motions of molecules. In a gas or...
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