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SBI3C Name:____________________ Use pg 20-23 to complete the following. Elements and Molecules Chemistry is the study of ____________. Matter is composed of tiny particles called atoms that consist of _____________, ________________and _______________. The _____________ table lists elements in order of increasing atomic number. Molecules are ____________________________________________________. Molecules can contain only one element (i.e _______) or may contain different types of elements (i.e. ____) Subscripts, ___, ___, ____ and_____ refer to the state of the substance – solid, liquid, gas or ________________ __________. The symbol (aq) means that the substance is ______________________________. Draw and Label Fig 2 below to show two examples of molecules. Chemical Bonds Atoms form chemical bonds by gaining or losing ____________, or by sharing them. __________bonds form between oppositely charge ions (charged atoms). Covalent bonds form when atoms ________electrons. Polar molecules are molecules that have a ______________charged end and a negatively charged end. Nonpolar molecules do not have ___________ _________. Hydrogen Bonds The strongest intermolecular bond is the __________bond which forms between highly polar molecules containing combinations of hydrogen, oxygen and nitrogen. ______________molecules form hydrogen bonds. Water: A Very Important Molecule Water is probably the most ______________molecule on earth. Water makes up about _______ ________of your bodies mass. Water is composed of _________________________________________________. Hydrogen bonds form between water molecules and are difficult to break and are responsible for waters ________________________________. Draw and label Fig 7 below to show hydrogen bonding in water molecules. Aqueous Soluations When predicting whether or not a substance will dissolve in water, scientists use the saying ________________. Meaning _________________________________ ___________________________________________________________________ Hydrophobic means __________________________________________________ An example of a hydrophobic substance is _____________. Hydrophilic means ___________________________________________________ An example of a hydrophilic substance is______________. Concentration The concentration of a solution is _______________________________________. Concentration can be expressed in many ways, list a few