Hydrogen atom Samenvattingen, Aantekeningen en Examens
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A LEVEL CHEMISTRY EXAM WITH COMPLETE SOLUTIONS alkali - A type of base that dissolves in water forming hydroxide ions, OH- (aq) ions. alkanes - The homologous series with the general formula: CnH2n+2. alkyl group - An alkane with a hydrogen atom remove
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A LEVEL CHEMISTRY EXAM WITH COMPLETE SOLUTIONS 
 
alkali - A type of base that dissolves in water forming hydroxide ions, OH- (aq) ions. 
 
alkanes - The homologous series with the general formula: CnH2n+2. 
 
alkyl group - An alkane with a hydrogen atom removed, e.g. CH3, C2H5; alkyl groups are often shown as 'R'. 
 
amount of substance - The quantity whose unit of the mole. Chemists use 'amount of substance' as a means of counting atoms. 
 
anhydrous - A substance that contains no water mo...
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WGU C458 Health, Fitness and Wellness Questions and Answers 100% Pass
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WGU C458 Health, Fitness and Wellness Questions and Answers 100% Pass Nutrition provides the body with the nutrients it needs to perform its daily tasks 
Undernutrition implies that the individual is not getting enough nutrients. This can occur even if the person is consuming more than enough calories 
Malnutrition an imbalance of proper nutrients 
Anorexia nervosa literally means loss of appetite, but this is a misnomer: A person with this is hungry, but denies the hunger because of an irration...
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BSC 1010 Final Exam FSW (Questions with error-free answers)
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The atomic number of an element is the number of correct answers protons in the nucleus 
 
In a covalent bond, atoms correct answers share electrons 
 
In living cells, a process by which cells break polymers down into monomers with the addition of water is correct answers hydrolysis 
 
The primary building block of proteins correct answers amino acid 
 
cohesion is a property of water in which water molecules tend to stick together correct answers true 
 
Carbohydrate polymer limited to two mon...
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A-level PHYSICS Paper 1
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Section A 
 
Answer all questions in this section. 
 
Do not write outside the box 
 
 
Two stable isotopes of helium are 4He and 3He. 
2	2 
.	An atom of 4He is produced in a rock that contains uranium. It is produced following 
2 
the radioactive decay of a 238U atom. The decay also creates an atom of 
92 
 
thorium (Th). 
Write an equation for the decay of 238U. 
92 
 
 
 
 
[2 marks] 
 
 
238U → 
92 
 
 
.	A 3He nucleus can be produced by the decay of a tritium nucleus 3H. 
2	1 
 
Stat...
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OCR AS LEVEL CHEMISTRY A H032/01 BREADTH IN CHEMISTRY ORIGINAL 2024 EXAM 100 % COMPLETE QUESTIONS AND ANSWERS A+ SCORE GUARANTEED.CHECK THE LAST PAGE FOR ANSWERS.
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OCR AS LEVEL CHEMISTRY A H032/01 BREADTH IN CHEMISTRY 
 ORIGINAL 2024 EXAM 100 % COMPLETE QUESTIONS AND ANSWERS 
A+ SCORE GUARANTEED.CHECK THE LAST PAGE FOR ANSWERS. 
1	Which substance contains polar molecules? 
 
A	C2H4 
B	CO2 
C	NCl 3 
D	SF6 
Your answer	 	[1] 
 
 
2	What is the formula of silver carbonate? 
 
A	AgCO3 
B	Ag(CO3)2 
C	Ag2CO3 
D	Ag3CO3 
Your answer	 	[1] 
 
 
3	Which statement explains why ice is less dense than water? 
 
A	Hydrogen bonds are stronger in ice than in water. 
 
B	H...
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BCH4024 Exam 1 Purich Questions & Answers 2023/2024
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BCH4024 Exam 1 Purich Questions & Answers 2023/2024 
 
Basic Structure of water - ANSWER--large dipole moment 
-very polar that interactions between H2O molecules are strong--high heat capacity 
-liquid water=H-bonds are relentlessly made and broken; thus a flickering collection of W5 structures, with extremely little W1 
-each water molecule can form up to 4 H-bonds 
-liquid water has 3.4 H-bonds on average 
-ice has 4 H-bonds 
 
H-bond - ANSWER-stable interaction occurring when 2 EN atoms shar...
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Module 4 (AS organic) CHEMISTRY OCR (Questions with 100% correct answers)
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What is a hydrocarbon? correct answers A compound containing hydrogen and carbon ONLY. 
 
What is meant by saturated? correct answers Single bonds only between carbon atoms 
 
What is a homologous series? correct answers Series of organic compounds with the same functional groups. 
With each successive iteration differing by CH2 
 
What is a functional group? correct answers Part of a molecule responsible for the characteristic reactions of a compound 
 
What is an alkyl group? correct answers A...
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EPA 608 Certification Exam with 100% Correct Answers 2023
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What date was the sale of CFC's & HCFC's restricted to technicians certified in 
refrigerant recovery? - Correct answer-November 14, 1994 
Section 608 of the Federal Clean Air Act requires technicians to what? - Correct 
answer-Recover all refrigerants. 
The objective of the Clean Air Act is to protect what? - Correct answer-The earth's 
stratosphere. 
HFC's - Correct answer-HydroFlouroCarbon's 
CFC's - Correct answer-ChloroFluoroCarbon's 
ODP - Correct answer-Ozone Depletion Potential 
W...
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PAX Prep NLN Verbal Comprehension Passages
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PAX Prep NLN Verbal Comprehension Passages 
 
 
The way Things Work 
It was the ancient Greeks who first had the idea that everything is made up of elements. They conjured up just four of them-earth, fire, wind and water. As it turned out, the idea was right but the elements were wrong. Modern elements are less evocative but more numerous. They make up just over one hundred basic substances. Some are commonplace, like hydrogen, oxygen, iron and carbon; others are rare and precious, such as mercu...
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BSC 1010 Final Exam (A+ GRADED)
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ATP correct answers Adenosine triphosphate. The energy currency of the cell. 
 
Endomembrane System correct answers A network of membranes inside and around a eukaryotic cell, related either through direct physical contact or by the transfer of membranous vesicles. 
 
oxidation correct answers Loss of electrons 
 
reduction correct answers Any process in which electrons are added to an atom or ion (as by removing oxygen or adding hydrogen) 
 
exergonic correct answers A reaction that results in ...