ChemCafe — science, chemistry and physics made simple – Page 129 of 276 – Chem Cafe is a place to share and discuss new scientific research. Read about the latest advances in chemistry, physics, astronomy, biology, medicine, social science, and more. Find and submit new publications and popular science coverage of current research.

Posted inin Chemistry

NMR Terminology: Understanding Upfield and Downfield in Chemical Shifts and Magnetic Fields

Posted byby Franklin Veaux
1 month ago
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5 min

NMR Terminology: Understanding Upfield and Downfield In nuclear magnetic resonance (NMR), “upfield” refers to signals at lower ppm values where nuclei are more shielded by electrons, experiencing a weaker magnetic...

Posted inin Chemistry

Potassium Nitrate Mixed with Stannous Fluoride: Benefits and Stability in Toothpaste Formulations

Posted byby Franklin Veaux
1 month ago
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2 min

Potassium Nitrate Mixed with Stannous Fluoride Potassium nitrate mixed with stannous fluoride can coexist in toothpaste but generally does not chemically react. The mixture requires careful formulation to maintain stability...

Posted inin Inorganic Chemistry

This Doesn’t Make Sense: Understanding Molecular Configuration and 3D Structure Priorities

Posted byby Franklin Veaux
1 month ago
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2 min

Understanding Molecular Configuration and Priority Visualization The dashed bond in molecular drawings does not indicate the priority of substituent groups. This common misconception can lead to confusion when assigning stereochemical...

Posted inin Chemistry

The Ingredients in My 2003 Johnston’s Baby Lotion vs My 2023 Bottle: A Clear Comparison of Changes

Posted byby Franklin Veaux
1 month ago
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4 min

Ingredient Changes in Johnston’s Baby Lotion: 2003 vs 2023 The ingredients in my 2003 Johnston’s baby lotion vs my 2023 bottle have changed significantly due to updates in formulation driven...

Posted inin Inorganic Chemistry

Why is CN− a Better Nucleophile than a Base? Understanding Nucleophilicity and Basicity Differences

Posted byby Franklin Veaux
1 month ago
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2 min

Why is CN− a Better Nucleophile than a Base? CN− acts as a better nucleophile than a base due to its linear, compact shape and moderate basicity, which favors attack...

Posted inin Molecular

Can Smearing in PCR Be Removed? Insights on Cleanup Protocols and Result Enhancement

Posted byby Franklin Veaux
1 month ago
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4 min

Can Smearing or Streakiness Be Removed by PCR Cleanup? Examining Cleanup Protocols to Enhance PCR Results Direct PCR cleanup alone often cannot fully remove smearing or streakiness from PCR products....

Posted inin Chemistry

Is Bleached Paper Chemically Different from Unbleached Paper? Key Insights and Implications

Posted byby Franklin Veaux
1 month ago
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4 min

Is Bleached and Unbleached Paper Chemically the Same? Bleached and unbleached paper differ chemically, mainly due to the presence or absence of lignin. Bleached paper undergoes chemical processing to remove...

Posted inin Chemistry

Hydrofluoric Acid: Understanding Its Danger Despite Being a Weak Acid

Posted byby Franklin Veaux
1 month ago
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7 min

Why Is Hydrofluoric Acid So Dangerous if It’s a Weak Acid? Hydrofluoric acid (HF) is extremely dangerous despite being classified as a weak acid because its danger stems not from...

Posted inin Chemistry

The Color of Elements in Fireworks: Understanding Chemistry and Safety Concerns

Posted byby Franklin Veaux
1 month ago
0 Comments
5 min

The Color of Elements in Fireworks The color in fireworks depends on specific elements burned during the explosion. Each element emits characteristic colors when heated, creating the vibrant displays seen...

Posted inin Chemistry

What is a Molecule and What is an Atom? Defining Nature’s Smallest Building Blocks

Posted byby Franklin Veaux
1 month ago
0 Comments
5 min

Understanding Atoms and Molecules What Is an Atom? An atom is the smallest particle characteristic of a chemical element. It retains the properties of that element. Atoms consist of a...