2015年4月29日 · The geometry of molecules depends on the number of atoms present in the molecule and the angles between bonds in the molecule. For example, molecules CO_2 and H_2O both have three atoms. The angle between bonds is 180° in carbon dioxide making this molecule linear. The angle between bonds in water is 104.5° making water a bent molecule. …

2016年6月25日 · Hydrochloric acid, #"HCl"#, is a strong acid, so right from the start you should expect it to ionize completely in aqueous solution.

2017年1月24日 · The definition of a chemical change is one in which the chemical structure of a substance changes (i.e. there are bonds broken and/or formed). Dissolving salt in water does in fact cause a change in chemical structure - the crystalline structure of sodium and chlorine ions in a lattice changes to completely separate sodium ions and chloride ...

A chemical change is any change that results in the formation of new chemical substances with new properties. For example, hydrogen reacts with oxygen to form water. This is a chemical change. 2H₂ + O₂ → H₂O. Hydrogen and oxygen are both colourless gases, but water is a liquid at ordinary temperatures. EXAMPLES

Ionic compounds are compounds formed between a metal and nonmetal which have a crystalline lattice structure. They can conduct electricity and are usually highly water soluble. The ionic compounds can form one cohesive compound, such as Potassium Fluoride, or form more complex polyatomic ionic compounds, such as Calcium Carbonate.

2014年1月10日 · Covalent bonds do not dissolve in water, but some covalent compounds do. Covalent molecules are attracted to each other by various intermolecular forces such as H-bonds, dipole-dipole forces, and London dispersion forces. Water molecules are attracted to each other by strong H-bonds. A polar solute may be attracted to the water molecules as strongly as the …

2016年1月10日 · The four macromolecules are nucleic acids, carbohydrates, proteins, and lipids. Structure: 1. Nucleic acids: Contain N in rings, nucleotides made of sugar, phosphate and nitrogenous base Carbohydrates: Made of C,H, and O; –OH's on all carbons except one Lipid: Made of C,H, and O; lots of C-H bonds; may have some C=C bonds (unsaturated) Protein: …

2017年11月8日 · It is not a chemical change because oil and water do not react chemically. Mixing oil and water is not a chemical change, because they do not react chemically. You can separate the individual components of the oil-water mixture by physical means. One method is by performing a liquid-liquid extraction or separation using a separation (separatory) funnel. This …

Ionic compounds tend to be crystalline structures with high melting points that are water soluble. Covalent bonds are highly stable bonds with low melting points. Many covalent compounds are flexible or gaseous and are not water soluble. Metallic compounds contain freely floating electrons which allow them to conduct electricity and heat well.

2016年4月4日 · Covalent Bond Hydrogen and oxygen are non-metals. They bonded together through covalent bonding. Instead of losing electrons, hydrogen and oxygen share their electrons so that they have full outer shells.