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Dangerous Substances’ Sign; Self-Adhesive Vinyl 200mm x
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Dangerous Substances’ Sign; Rigid 1mm PVC Board 200mm x
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Physical Matters Properties Classroom
Learn all about exciting polymers and their countless applications to demonstrate how materials can change.Demonstrate real world examples of conservation of mass, surface tension, polarity, osmosis, saturation and moreLearn the difference between
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Deioniser Housing - Double
A simple, portable deioniser giving good quality water at an affordable price, for housing two cartridges.Housing is not supplied with cartridges, and these are available to purchase separately.Free standing or wall mountable, wall mountable brackets
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What are the properties of ionic substances?
Ionic substances are composed of positively and negatively charged ions held together by electrostatic forces. They have high melting and boiling points due to the strong ionic bonds. They are typically soluble in water and conduct electricity when dissolved or molten, but not in their solid state. Ionic substances are often crystalline in structure and are brittle.
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What are characteristic properties of substances in chemistry?
Characteristic properties of substances in chemistry are unique qualities that help identify and differentiate one substance from another. These properties include physical properties such as color, odor, density, melting point, boiling point, and solubility. Chemical properties, on the other hand, describe how a substance interacts with other substances, such as its reactivity, acidity, and ability to undergo chemical reactions. These characteristic properties are essential for identifying, classifying, and studying different substances in chemistry.
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What are the basic substances and properties of semiconductors?
Semiconductors are materials that have properties between those of insulators and conductors. The basic substances used in semiconductors are typically silicon, germanium, and gallium arsenide. These materials have a crystalline structure and can conduct electricity under certain conditions. The key properties of semiconductors include their ability to change conductivity with temperature, light, or voltage, making them essential for electronic devices like transistors and diodes.
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What are the properties of alkalis and similar substances?
Alkalis and similar substances are typically characterized by their ability to neutralize acids, forming salts and water. They are also known for their soapy or slippery feel, and their ability to conduct electricity when dissolved in water. Alkalis are often found in cleaning products and are known for their ability to dissolve grease and oils. Additionally, they are typically bitter in taste and have a pH greater than 7.
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Deioniser Housing - Single
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Properties of Materials Macro Science
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How do molecular substances differ in their properties from salts?
Molecular substances differ from salts in several ways. Molecular substances are made up of individual molecules held together by covalent bonds, while salts are made up of ions held together by ionic bonds. This difference in bonding leads to differences in properties such as melting and boiling points, solubility, and conductivity. Molecular substances tend to have lower melting and boiling points, are often soluble in nonpolar solvents, and do not conduct electricity in their pure form, while salts have higher melting and boiling points, are often soluble in water, and can conduct electricity when dissolved in water.
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What are ion substances and molecule substances?
Ion substances are compounds made up of positively and negatively charged ions, such as sodium chloride (NaCl) or calcium carbonate (CaCO3). These substances are held together by electrostatic forces between the ions. Molecule substances, on the other hand, are made up of covalently bonded atoms, such as water (H2O) or carbon dioxide (CO2). These substances are held together by sharing electrons between the atoms. In summary, ion substances are composed of charged ions held together by electrostatic forces, while molecule substances are composed of covalently bonded atoms held together by shared electrons.
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To which substances do the elemental substances belong?
Elemental substances belong to the group of pure substances, which are made up of only one type of atom. These elemental substances are the building blocks of all matter and cannot be broken down into simpler substances by chemical means. Examples of elemental substances include hydrogen, oxygen, carbon, and gold.
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Why do polar substances dissolve in polar substances?
Polar substances dissolve in polar substances because they have similar intermolecular forces. Polar substances, such as water, have a partial positive and partial negative charge, which allows them to form hydrogen bonds with other polar molecules. When a polar substance is added to a polar solvent, the partial charges on the solvent molecules attract and surround the solute molecules, causing them to separate and disperse evenly throughout the solvent. This allows the polar solute to dissolve in the polar solvent, forming a homogeneous mixture.
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